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_iter
.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_iter
.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
);
785 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
786 rdev
->meta_bdev
: rdev
->bdev
;
788 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
789 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
790 (rdev
->mddev
->reshape_backwards
==
791 (sector
>= rdev
->mddev
->reshape_position
)))
792 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
794 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
795 bio_add_page(bio
, page
, size
, 0);
796 submit_bio_wait(rw
, bio
);
798 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
802 EXPORT_SYMBOL_GPL(sync_page_io
);
804 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
806 char b
[BDEVNAME_SIZE
];
807 if (!rdev
->sb_page
) {
815 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
821 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
822 bdevname(rdev
->bdev
,b
));
826 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
828 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
829 sb1
->set_uuid1
== sb2
->set_uuid1
&&
830 sb1
->set_uuid2
== sb2
->set_uuid2
&&
831 sb1
->set_uuid3
== sb2
->set_uuid3
;
834 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
837 mdp_super_t
*tmp1
, *tmp2
;
839 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
840 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
842 if (!tmp1
|| !tmp2
) {
844 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
852 * nr_disks is not constant
857 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
865 static u32
md_csum_fold(u32 csum
)
867 csum
= (csum
& 0xffff) + (csum
>> 16);
868 return (csum
& 0xffff) + (csum
>> 16);
871 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
874 u32
*sb32
= (u32
*)sb
;
876 unsigned int disk_csum
, csum
;
878 disk_csum
= sb
->sb_csum
;
881 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
883 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
887 /* This used to use csum_partial, which was wrong for several
888 * reasons including that different results are returned on
889 * different architectures. It isn't critical that we get exactly
890 * the same return value as before (we always csum_fold before
891 * testing, and that removes any differences). However as we
892 * know that csum_partial always returned a 16bit value on
893 * alphas, do a fold to maximise conformity to previous behaviour.
895 sb
->sb_csum
= md_csum_fold(disk_csum
);
897 sb
->sb_csum
= disk_csum
;
904 * Handle superblock details.
905 * We want to be able to handle multiple superblock formats
906 * so we have a common interface to them all, and an array of
907 * different handlers.
908 * We rely on user-space to write the initial superblock, and support
909 * reading and updating of superblocks.
910 * Interface methods are:
911 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
912 * loads and validates a superblock on dev.
913 * if refdev != NULL, compare superblocks on both devices
915 * 0 - dev has a superblock that is compatible with refdev
916 * 1 - dev has a superblock that is compatible and newer than refdev
917 * so dev should be used as the refdev in future
918 * -EINVAL superblock incompatible or invalid
919 * -othererror e.g. -EIO
921 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
922 * Verify that dev is acceptable into mddev.
923 * The first time, mddev->raid_disks will be 0, and data from
924 * dev should be merged in. Subsequent calls check that dev
925 * is new enough. Return 0 or -EINVAL
927 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
928 * Update the superblock for rdev with data in mddev
929 * This does not write to disc.
935 struct module
*owner
;
936 int (*load_super
)(struct md_rdev
*rdev
,
937 struct md_rdev
*refdev
,
939 int (*validate_super
)(struct mddev
*mddev
,
940 struct md_rdev
*rdev
);
941 void (*sync_super
)(struct mddev
*mddev
,
942 struct md_rdev
*rdev
);
943 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
944 sector_t num_sectors
);
945 int (*allow_new_offset
)(struct md_rdev
*rdev
,
946 unsigned long long new_offset
);
950 * Check that the given mddev has no bitmap.
952 * This function is called from the run method of all personalities that do not
953 * support bitmaps. It prints an error message and returns non-zero if mddev
954 * has a bitmap. Otherwise, it returns 0.
957 int md_check_no_bitmap(struct mddev
*mddev
)
959 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
961 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
962 mdname(mddev
), mddev
->pers
->name
);
965 EXPORT_SYMBOL(md_check_no_bitmap
);
968 * load_super for 0.90.0
970 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
972 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
977 * Calculate the position of the superblock (512byte sectors),
978 * it's at the end of the disk.
980 * It also happens to be a multiple of 4Kb.
982 rdev
->sb_start
= calc_dev_sboffset(rdev
);
984 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
989 bdevname(rdev
->bdev
, b
);
990 sb
= page_address(rdev
->sb_page
);
992 if (sb
->md_magic
!= MD_SB_MAGIC
) {
993 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
998 if (sb
->major_version
!= 0 ||
999 sb
->minor_version
< 90 ||
1000 sb
->minor_version
> 91) {
1001 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1002 sb
->major_version
, sb
->minor_version
,
1007 if (sb
->raid_disks
<= 0)
1010 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1011 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1016 rdev
->preferred_minor
= sb
->md_minor
;
1017 rdev
->data_offset
= 0;
1018 rdev
->new_data_offset
= 0;
1019 rdev
->sb_size
= MD_SB_BYTES
;
1020 rdev
->badblocks
.shift
= -1;
1022 if (sb
->level
== LEVEL_MULTIPATH
)
1025 rdev
->desc_nr
= sb
->this_disk
.number
;
1031 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1032 if (!uuid_equal(refsb
, sb
)) {
1033 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1034 b
, bdevname(refdev
->bdev
,b2
));
1037 if (!sb_equal(refsb
, sb
)) {
1038 printk(KERN_WARNING
"md: %s has same UUID"
1039 " but different superblock to %s\n",
1040 b
, bdevname(refdev
->bdev
, b2
));
1044 ev2
= md_event(refsb
);
1050 rdev
->sectors
= rdev
->sb_start
;
1051 /* Limit to 4TB as metadata cannot record more than that.
1052 * (not needed for Linear and RAID0 as metadata doesn't
1055 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1056 rdev
->sectors
= (2ULL << 32) - 2;
1058 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1059 /* "this cannot possibly happen" ... */
1067 * validate_super for 0.90.0
1069 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1072 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1073 __u64 ev1
= md_event(sb
);
1075 rdev
->raid_disk
= -1;
1076 clear_bit(Faulty
, &rdev
->flags
);
1077 clear_bit(In_sync
, &rdev
->flags
);
1078 clear_bit(WriteMostly
, &rdev
->flags
);
1080 if (mddev
->raid_disks
== 0) {
1081 mddev
->major_version
= 0;
1082 mddev
->minor_version
= sb
->minor_version
;
1083 mddev
->patch_version
= sb
->patch_version
;
1084 mddev
->external
= 0;
1085 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1086 mddev
->ctime
= sb
->ctime
;
1087 mddev
->utime
= sb
->utime
;
1088 mddev
->level
= sb
->level
;
1089 mddev
->clevel
[0] = 0;
1090 mddev
->layout
= sb
->layout
;
1091 mddev
->raid_disks
= sb
->raid_disks
;
1092 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1093 mddev
->events
= ev1
;
1094 mddev
->bitmap_info
.offset
= 0;
1095 mddev
->bitmap_info
.space
= 0;
1096 /* bitmap can use 60 K after the 4K superblocks */
1097 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1098 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1099 mddev
->reshape_backwards
= 0;
1101 if (mddev
->minor_version
>= 91) {
1102 mddev
->reshape_position
= sb
->reshape_position
;
1103 mddev
->delta_disks
= sb
->delta_disks
;
1104 mddev
->new_level
= sb
->new_level
;
1105 mddev
->new_layout
= sb
->new_layout
;
1106 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1107 if (mddev
->delta_disks
< 0)
1108 mddev
->reshape_backwards
= 1;
1110 mddev
->reshape_position
= MaxSector
;
1111 mddev
->delta_disks
= 0;
1112 mddev
->new_level
= mddev
->level
;
1113 mddev
->new_layout
= mddev
->layout
;
1114 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1117 if (sb
->state
& (1<<MD_SB_CLEAN
))
1118 mddev
->recovery_cp
= MaxSector
;
1120 if (sb
->events_hi
== sb
->cp_events_hi
&&
1121 sb
->events_lo
== sb
->cp_events_lo
) {
1122 mddev
->recovery_cp
= sb
->recovery_cp
;
1124 mddev
->recovery_cp
= 0;
1127 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1128 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1129 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1130 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1132 mddev
->max_disks
= MD_SB_DISKS
;
1134 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1135 mddev
->bitmap_info
.file
== NULL
) {
1136 mddev
->bitmap_info
.offset
=
1137 mddev
->bitmap_info
.default_offset
;
1138 mddev
->bitmap_info
.space
=
1139 mddev
->bitmap_info
.default_space
;
1142 } else if (mddev
->pers
== NULL
) {
1143 /* Insist on good event counter while assembling, except
1144 * for spares (which don't need an event count) */
1146 if (sb
->disks
[rdev
->desc_nr
].state
& (
1147 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1148 if (ev1
< mddev
->events
)
1150 } else if (mddev
->bitmap
) {
1151 /* if adding to array with a bitmap, then we can accept an
1152 * older device ... but not too old.
1154 if (ev1
< mddev
->bitmap
->events_cleared
)
1157 if (ev1
< mddev
->events
)
1158 /* just a hot-add of a new device, leave raid_disk at -1 */
1162 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1163 desc
= sb
->disks
+ rdev
->desc_nr
;
1165 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1166 set_bit(Faulty
, &rdev
->flags
);
1167 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1168 desc->raid_disk < mddev->raid_disks */) {
1169 set_bit(In_sync
, &rdev
->flags
);
1170 rdev
->raid_disk
= desc
->raid_disk
;
1171 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1172 /* active but not in sync implies recovery up to
1173 * reshape position. We don't know exactly where
1174 * that is, so set to zero for now */
1175 if (mddev
->minor_version
>= 91) {
1176 rdev
->recovery_offset
= 0;
1177 rdev
->raid_disk
= desc
->raid_disk
;
1180 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1181 set_bit(WriteMostly
, &rdev
->flags
);
1182 } else /* MULTIPATH are always insync */
1183 set_bit(In_sync
, &rdev
->flags
);
1188 * sync_super for 0.90.0
1190 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1193 struct md_rdev
*rdev2
;
1194 int next_spare
= mddev
->raid_disks
;
1197 /* make rdev->sb match mddev data..
1200 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1201 * 3/ any empty disks < next_spare become removed
1203 * disks[0] gets initialised to REMOVED because
1204 * we cannot be sure from other fields if it has
1205 * been initialised or not.
1208 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1210 rdev
->sb_size
= MD_SB_BYTES
;
1212 sb
= page_address(rdev
->sb_page
);
1214 memset(sb
, 0, sizeof(*sb
));
1216 sb
->md_magic
= MD_SB_MAGIC
;
1217 sb
->major_version
= mddev
->major_version
;
1218 sb
->patch_version
= mddev
->patch_version
;
1219 sb
->gvalid_words
= 0; /* ignored */
1220 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1221 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1222 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1223 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1225 sb
->ctime
= mddev
->ctime
;
1226 sb
->level
= mddev
->level
;
1227 sb
->size
= mddev
->dev_sectors
/ 2;
1228 sb
->raid_disks
= mddev
->raid_disks
;
1229 sb
->md_minor
= mddev
->md_minor
;
1230 sb
->not_persistent
= 0;
1231 sb
->utime
= mddev
->utime
;
1233 sb
->events_hi
= (mddev
->events
>>32);
1234 sb
->events_lo
= (u32
)mddev
->events
;
1236 if (mddev
->reshape_position
== MaxSector
)
1237 sb
->minor_version
= 90;
1239 sb
->minor_version
= 91;
1240 sb
->reshape_position
= mddev
->reshape_position
;
1241 sb
->new_level
= mddev
->new_level
;
1242 sb
->delta_disks
= mddev
->delta_disks
;
1243 sb
->new_layout
= mddev
->new_layout
;
1244 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1246 mddev
->minor_version
= sb
->minor_version
;
1249 sb
->recovery_cp
= mddev
->recovery_cp
;
1250 sb
->cp_events_hi
= (mddev
->events
>>32);
1251 sb
->cp_events_lo
= (u32
)mddev
->events
;
1252 if (mddev
->recovery_cp
== MaxSector
)
1253 sb
->state
= (1<< MD_SB_CLEAN
);
1255 sb
->recovery_cp
= 0;
1257 sb
->layout
= mddev
->layout
;
1258 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1260 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1261 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1263 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1264 rdev_for_each(rdev2
, mddev
) {
1267 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1269 if (rdev2
->raid_disk
>= 0 &&
1270 sb
->minor_version
>= 91)
1271 /* we have nowhere to store the recovery_offset,
1272 * but if it is not below the reshape_position,
1273 * we can piggy-back on that.
1276 if (rdev2
->raid_disk
< 0 ||
1277 test_bit(Faulty
, &rdev2
->flags
))
1280 desc_nr
= rdev2
->raid_disk
;
1282 desc_nr
= next_spare
++;
1283 rdev2
->desc_nr
= desc_nr
;
1284 d
= &sb
->disks
[rdev2
->desc_nr
];
1286 d
->number
= rdev2
->desc_nr
;
1287 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1288 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1290 d
->raid_disk
= rdev2
->raid_disk
;
1292 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1293 if (test_bit(Faulty
, &rdev2
->flags
))
1294 d
->state
= (1<<MD_DISK_FAULTY
);
1295 else if (is_active
) {
1296 d
->state
= (1<<MD_DISK_ACTIVE
);
1297 if (test_bit(In_sync
, &rdev2
->flags
))
1298 d
->state
|= (1<<MD_DISK_SYNC
);
1306 if (test_bit(WriteMostly
, &rdev2
->flags
))
1307 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1309 /* now set the "removed" and "faulty" bits on any missing devices */
1310 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1311 mdp_disk_t
*d
= &sb
->disks
[i
];
1312 if (d
->state
== 0 && d
->number
== 0) {
1315 d
->state
= (1<<MD_DISK_REMOVED
);
1316 d
->state
|= (1<<MD_DISK_FAULTY
);
1320 sb
->nr_disks
= nr_disks
;
1321 sb
->active_disks
= active
;
1322 sb
->working_disks
= working
;
1323 sb
->failed_disks
= failed
;
1324 sb
->spare_disks
= spare
;
1326 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1327 sb
->sb_csum
= calc_sb_csum(sb
);
1331 * rdev_size_change for 0.90.0
1333 static unsigned long long
1334 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1336 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1337 return 0; /* component must fit device */
1338 if (rdev
->mddev
->bitmap_info
.offset
)
1339 return 0; /* can't move bitmap */
1340 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1341 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1342 num_sectors
= rdev
->sb_start
;
1343 /* Limit to 4TB as metadata cannot record more than that.
1344 * 4TB == 2^32 KB, or 2*2^32 sectors.
1346 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1347 num_sectors
= (2ULL << 32) - 2;
1348 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1350 md_super_wait(rdev
->mddev
);
1355 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1357 /* non-zero offset changes not possible with v0.90 */
1358 return new_offset
== 0;
1362 * version 1 superblock
1365 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1369 unsigned long long newcsum
;
1370 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1371 __le32
*isuper
= (__le32
*)sb
;
1373 disk_csum
= sb
->sb_csum
;
1376 for (; size
>= 4; size
-= 4)
1377 newcsum
+= le32_to_cpu(*isuper
++);
1380 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1382 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1383 sb
->sb_csum
= disk_csum
;
1384 return cpu_to_le32(csum
);
1387 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1389 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1391 struct mdp_superblock_1
*sb
;
1395 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1399 * Calculate the position of the superblock in 512byte sectors.
1400 * It is always aligned to a 4K boundary and
1401 * depeding on minor_version, it can be:
1402 * 0: At least 8K, but less than 12K, from end of device
1403 * 1: At start of device
1404 * 2: 4K from start of device.
1406 switch(minor_version
) {
1408 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1410 sb_start
&= ~(sector_t
)(4*2-1);
1421 rdev
->sb_start
= sb_start
;
1423 /* superblock is rarely larger than 1K, but it can be larger,
1424 * and it is safe to read 4k, so we do that
1426 ret
= read_disk_sb(rdev
, 4096);
1427 if (ret
) return ret
;
1430 sb
= page_address(rdev
->sb_page
);
1432 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1433 sb
->major_version
!= cpu_to_le32(1) ||
1434 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1435 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1436 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1439 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1440 printk("md: invalid superblock checksum on %s\n",
1441 bdevname(rdev
->bdev
,b
));
1444 if (le64_to_cpu(sb
->data_size
) < 10) {
1445 printk("md: data_size too small on %s\n",
1446 bdevname(rdev
->bdev
,b
));
1451 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1452 /* Some padding is non-zero, might be a new feature */
1455 rdev
->preferred_minor
= 0xffff;
1456 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1457 rdev
->new_data_offset
= rdev
->data_offset
;
1458 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1459 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1460 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1461 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1463 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1464 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1465 if (rdev
->sb_size
& bmask
)
1466 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1469 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1472 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1475 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1478 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1480 if (!rdev
->bb_page
) {
1481 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1485 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1486 rdev
->badblocks
.count
== 0) {
1487 /* need to load the bad block list.
1488 * Currently we limit it to one page.
1494 int sectors
= le16_to_cpu(sb
->bblog_size
);
1495 if (sectors
> (PAGE_SIZE
/ 512))
1497 offset
= le32_to_cpu(sb
->bblog_offset
);
1500 bb_sector
= (long long)offset
;
1501 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1502 rdev
->bb_page
, READ
, true))
1504 bbp
= (u64
*)page_address(rdev
->bb_page
);
1505 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1506 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1507 u64 bb
= le64_to_cpu(*bbp
);
1508 int count
= bb
& (0x3ff);
1509 u64 sector
= bb
>> 10;
1510 sector
<<= sb
->bblog_shift
;
1511 count
<<= sb
->bblog_shift
;
1514 if (md_set_badblocks(&rdev
->badblocks
,
1515 sector
, count
, 1) == 0)
1518 } else if (sb
->bblog_offset
!= 0)
1519 rdev
->badblocks
.shift
= 0;
1525 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1527 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1528 sb
->level
!= refsb
->level
||
1529 sb
->layout
!= refsb
->layout
||
1530 sb
->chunksize
!= refsb
->chunksize
) {
1531 printk(KERN_WARNING
"md: %s has strangely different"
1532 " superblock to %s\n",
1533 bdevname(rdev
->bdev
,b
),
1534 bdevname(refdev
->bdev
,b2
));
1537 ev1
= le64_to_cpu(sb
->events
);
1538 ev2
= le64_to_cpu(refsb
->events
);
1545 if (minor_version
) {
1546 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1547 sectors
-= rdev
->data_offset
;
1549 sectors
= rdev
->sb_start
;
1550 if (sectors
< le64_to_cpu(sb
->data_size
))
1552 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1556 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1558 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1559 __u64 ev1
= le64_to_cpu(sb
->events
);
1561 rdev
->raid_disk
= -1;
1562 clear_bit(Faulty
, &rdev
->flags
);
1563 clear_bit(In_sync
, &rdev
->flags
);
1564 clear_bit(WriteMostly
, &rdev
->flags
);
1566 if (mddev
->raid_disks
== 0) {
1567 mddev
->major_version
= 1;
1568 mddev
->patch_version
= 0;
1569 mddev
->external
= 0;
1570 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1571 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1572 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1573 mddev
->level
= le32_to_cpu(sb
->level
);
1574 mddev
->clevel
[0] = 0;
1575 mddev
->layout
= le32_to_cpu(sb
->layout
);
1576 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1577 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1578 mddev
->events
= ev1
;
1579 mddev
->bitmap_info
.offset
= 0;
1580 mddev
->bitmap_info
.space
= 0;
1581 /* Default location for bitmap is 1K after superblock
1582 * using 3K - total of 4K
1584 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1585 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1586 mddev
->reshape_backwards
= 0;
1588 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1589 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1591 mddev
->max_disks
= (4096-256)/2;
1593 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1594 mddev
->bitmap_info
.file
== NULL
) {
1595 mddev
->bitmap_info
.offset
=
1596 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1597 /* Metadata doesn't record how much space is available.
1598 * For 1.0, we assume we can use up to the superblock
1599 * if before, else to 4K beyond superblock.
1600 * For others, assume no change is possible.
1602 if (mddev
->minor_version
> 0)
1603 mddev
->bitmap_info
.space
= 0;
1604 else if (mddev
->bitmap_info
.offset
> 0)
1605 mddev
->bitmap_info
.space
=
1606 8 - mddev
->bitmap_info
.offset
;
1608 mddev
->bitmap_info
.space
=
1609 -mddev
->bitmap_info
.offset
;
1612 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1613 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1614 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1615 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1616 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1617 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1618 if (mddev
->delta_disks
< 0 ||
1619 (mddev
->delta_disks
== 0 &&
1620 (le32_to_cpu(sb
->feature_map
)
1621 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1622 mddev
->reshape_backwards
= 1;
1624 mddev
->reshape_position
= MaxSector
;
1625 mddev
->delta_disks
= 0;
1626 mddev
->new_level
= mddev
->level
;
1627 mddev
->new_layout
= mddev
->layout
;
1628 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1631 } else if (mddev
->pers
== NULL
) {
1632 /* Insist of good event counter while assembling, except for
1633 * spares (which don't need an event count) */
1635 if (rdev
->desc_nr
>= 0 &&
1636 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1637 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1638 if (ev1
< mddev
->events
)
1640 } else if (mddev
->bitmap
) {
1641 /* If adding to array with a bitmap, then we can accept an
1642 * older device, but not too old.
1644 if (ev1
< mddev
->bitmap
->events_cleared
)
1647 if (ev1
< mddev
->events
)
1648 /* just a hot-add of a new device, leave raid_disk at -1 */
1651 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1653 if (rdev
->desc_nr
< 0 ||
1654 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1658 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1660 case 0xffff: /* spare */
1662 case 0xfffe: /* faulty */
1663 set_bit(Faulty
, &rdev
->flags
);
1666 if ((le32_to_cpu(sb
->feature_map
) &
1667 MD_FEATURE_RECOVERY_OFFSET
))
1668 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1670 set_bit(In_sync
, &rdev
->flags
);
1671 rdev
->raid_disk
= role
;
1674 if (sb
->devflags
& WriteMostly1
)
1675 set_bit(WriteMostly
, &rdev
->flags
);
1676 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1677 set_bit(Replacement
, &rdev
->flags
);
1678 } else /* MULTIPATH are always insync */
1679 set_bit(In_sync
, &rdev
->flags
);
1684 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1686 struct mdp_superblock_1
*sb
;
1687 struct md_rdev
*rdev2
;
1689 /* make rdev->sb match mddev and rdev data. */
1691 sb
= page_address(rdev
->sb_page
);
1693 sb
->feature_map
= 0;
1695 sb
->recovery_offset
= cpu_to_le64(0);
1696 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1698 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1699 sb
->events
= cpu_to_le64(mddev
->events
);
1701 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1703 sb
->resync_offset
= cpu_to_le64(0);
1705 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1707 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1708 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1709 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1710 sb
->level
= cpu_to_le32(mddev
->level
);
1711 sb
->layout
= cpu_to_le32(mddev
->layout
);
1713 if (test_bit(WriteMostly
, &rdev
->flags
))
1714 sb
->devflags
|= WriteMostly1
;
1716 sb
->devflags
&= ~WriteMostly1
;
1717 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1718 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1720 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1721 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1722 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1725 if (rdev
->raid_disk
>= 0 &&
1726 !test_bit(In_sync
, &rdev
->flags
)) {
1728 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1729 sb
->recovery_offset
=
1730 cpu_to_le64(rdev
->recovery_offset
);
1732 if (test_bit(Replacement
, &rdev
->flags
))
1734 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1736 if (mddev
->reshape_position
!= MaxSector
) {
1737 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1738 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1739 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1740 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1741 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1742 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1743 if (mddev
->delta_disks
== 0 &&
1744 mddev
->reshape_backwards
)
1746 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1747 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1749 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1750 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1751 - rdev
->data_offset
));
1755 if (rdev
->badblocks
.count
== 0)
1756 /* Nothing to do for bad blocks*/ ;
1757 else if (sb
->bblog_offset
== 0)
1758 /* Cannot record bad blocks on this device */
1759 md_error(mddev
, rdev
);
1761 struct badblocks
*bb
= &rdev
->badblocks
;
1762 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1764 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1769 seq
= read_seqbegin(&bb
->lock
);
1771 memset(bbp
, 0xff, PAGE_SIZE
);
1773 for (i
= 0 ; i
< bb
->count
; i
++) {
1774 u64 internal_bb
= p
[i
];
1775 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1776 | BB_LEN(internal_bb
));
1777 bbp
[i
] = cpu_to_le64(store_bb
);
1780 if (read_seqretry(&bb
->lock
, seq
))
1783 bb
->sector
= (rdev
->sb_start
+
1784 (int)le32_to_cpu(sb
->bblog_offset
));
1785 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1790 rdev_for_each(rdev2
, mddev
)
1791 if (rdev2
->desc_nr
+1 > max_dev
)
1792 max_dev
= rdev2
->desc_nr
+1;
1794 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1796 sb
->max_dev
= cpu_to_le32(max_dev
);
1797 rdev
->sb_size
= max_dev
* 2 + 256;
1798 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1799 if (rdev
->sb_size
& bmask
)
1800 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1802 max_dev
= le32_to_cpu(sb
->max_dev
);
1804 for (i
=0; i
<max_dev
;i
++)
1805 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1807 rdev_for_each(rdev2
, mddev
) {
1809 if (test_bit(Faulty
, &rdev2
->flags
))
1810 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1811 else if (test_bit(In_sync
, &rdev2
->flags
))
1812 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1813 else if (rdev2
->raid_disk
>= 0)
1814 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1816 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1819 sb
->sb_csum
= calc_sb_1_csum(sb
);
1822 static unsigned long long
1823 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1825 struct mdp_superblock_1
*sb
;
1826 sector_t max_sectors
;
1827 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1828 return 0; /* component must fit device */
1829 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1830 return 0; /* too confusing */
1831 if (rdev
->sb_start
< rdev
->data_offset
) {
1832 /* minor versions 1 and 2; superblock before data */
1833 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1834 max_sectors
-= rdev
->data_offset
;
1835 if (!num_sectors
|| num_sectors
> max_sectors
)
1836 num_sectors
= max_sectors
;
1837 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1838 /* minor version 0 with bitmap we can't move */
1841 /* minor version 0; superblock after data */
1843 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1844 sb_start
&= ~(sector_t
)(4*2 - 1);
1845 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1846 if (!num_sectors
|| num_sectors
> max_sectors
)
1847 num_sectors
= max_sectors
;
1848 rdev
->sb_start
= sb_start
;
1850 sb
= page_address(rdev
->sb_page
);
1851 sb
->data_size
= cpu_to_le64(num_sectors
);
1852 sb
->super_offset
= rdev
->sb_start
;
1853 sb
->sb_csum
= calc_sb_1_csum(sb
);
1854 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1856 md_super_wait(rdev
->mddev
);
1862 super_1_allow_new_offset(struct md_rdev
*rdev
,
1863 unsigned long long new_offset
)
1865 /* All necessary checks on new >= old have been done */
1866 struct bitmap
*bitmap
;
1867 if (new_offset
>= rdev
->data_offset
)
1870 /* with 1.0 metadata, there is no metadata to tread on
1871 * so we can always move back */
1872 if (rdev
->mddev
->minor_version
== 0)
1875 /* otherwise we must be sure not to step on
1876 * any metadata, so stay:
1877 * 36K beyond start of superblock
1878 * beyond end of badblocks
1879 * beyond write-intent bitmap
1881 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1883 bitmap
= rdev
->mddev
->bitmap
;
1884 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1885 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1886 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1888 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1894 static struct super_type super_types
[] = {
1897 .owner
= THIS_MODULE
,
1898 .load_super
= super_90_load
,
1899 .validate_super
= super_90_validate
,
1900 .sync_super
= super_90_sync
,
1901 .rdev_size_change
= super_90_rdev_size_change
,
1902 .allow_new_offset
= super_90_allow_new_offset
,
1906 .owner
= THIS_MODULE
,
1907 .load_super
= super_1_load
,
1908 .validate_super
= super_1_validate
,
1909 .sync_super
= super_1_sync
,
1910 .rdev_size_change
= super_1_rdev_size_change
,
1911 .allow_new_offset
= super_1_allow_new_offset
,
1915 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1917 if (mddev
->sync_super
) {
1918 mddev
->sync_super(mddev
, rdev
);
1922 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1924 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1927 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1929 struct md_rdev
*rdev
, *rdev2
;
1932 rdev_for_each_rcu(rdev
, mddev1
)
1933 rdev_for_each_rcu(rdev2
, mddev2
)
1934 if (rdev
->bdev
->bd_contains
==
1935 rdev2
->bdev
->bd_contains
) {
1943 static LIST_HEAD(pending_raid_disks
);
1946 * Try to register data integrity profile for an mddev
1948 * This is called when an array is started and after a disk has been kicked
1949 * from the array. It only succeeds if all working and active component devices
1950 * are integrity capable with matching profiles.
1952 int md_integrity_register(struct mddev
*mddev
)
1954 struct md_rdev
*rdev
, *reference
= NULL
;
1956 if (list_empty(&mddev
->disks
))
1957 return 0; /* nothing to do */
1958 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1959 return 0; /* shouldn't register, or already is */
1960 rdev_for_each(rdev
, mddev
) {
1961 /* skip spares and non-functional disks */
1962 if (test_bit(Faulty
, &rdev
->flags
))
1964 if (rdev
->raid_disk
< 0)
1967 /* Use the first rdev as the reference */
1971 /* does this rdev's profile match the reference profile? */
1972 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1973 rdev
->bdev
->bd_disk
) < 0)
1976 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1979 * All component devices are integrity capable and have matching
1980 * profiles, register the common profile for the md device.
1982 if (blk_integrity_register(mddev
->gendisk
,
1983 bdev_get_integrity(reference
->bdev
)) != 0) {
1984 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1988 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1989 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1990 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1996 EXPORT_SYMBOL(md_integrity_register
);
1998 /* Disable data integrity if non-capable/non-matching disk is being added */
1999 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2001 struct blk_integrity
*bi_rdev
;
2002 struct blk_integrity
*bi_mddev
;
2004 if (!mddev
->gendisk
)
2007 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2008 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2010 if (!bi_mddev
) /* nothing to do */
2012 if (rdev
->raid_disk
< 0) /* skip spares */
2014 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2015 rdev
->bdev
->bd_disk
) >= 0)
2017 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2018 blk_integrity_unregister(mddev
->gendisk
);
2020 EXPORT_SYMBOL(md_integrity_add_rdev
);
2022 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2024 char b
[BDEVNAME_SIZE
];
2034 /* prevent duplicates */
2035 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2038 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2039 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2040 rdev
->sectors
< mddev
->dev_sectors
)) {
2042 /* Cannot change size, so fail
2043 * If mddev->level <= 0, then we don't care
2044 * about aligning sizes (e.g. linear)
2046 if (mddev
->level
> 0)
2049 mddev
->dev_sectors
= rdev
->sectors
;
2052 /* Verify rdev->desc_nr is unique.
2053 * If it is -1, assign a free number, else
2054 * check number is not in use
2056 if (rdev
->desc_nr
< 0) {
2058 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2059 while (find_rdev_nr(mddev
, choice
))
2061 rdev
->desc_nr
= choice
;
2063 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2066 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2067 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2068 mdname(mddev
), mddev
->max_disks
);
2071 bdevname(rdev
->bdev
,b
);
2072 while ( (s
=strchr(b
, '/')) != NULL
)
2075 rdev
->mddev
= mddev
;
2076 printk(KERN_INFO
"md: bind<%s>\n", b
);
2078 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2081 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2082 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2083 /* failure here is OK */;
2084 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2086 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2087 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2089 /* May as well allow recovery to be retried once */
2090 mddev
->recovery_disabled
++;
2095 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2100 static void md_delayed_delete(struct work_struct
*ws
)
2102 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2103 kobject_del(&rdev
->kobj
);
2104 kobject_put(&rdev
->kobj
);
2107 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2109 char b
[BDEVNAME_SIZE
];
2114 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2115 list_del_rcu(&rdev
->same_set
);
2116 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2118 sysfs_remove_link(&rdev
->kobj
, "block");
2119 sysfs_put(rdev
->sysfs_state
);
2120 rdev
->sysfs_state
= NULL
;
2121 rdev
->badblocks
.count
= 0;
2122 /* We need to delay this, otherwise we can deadlock when
2123 * writing to 'remove' to "dev/state". We also need
2124 * to delay it due to rcu usage.
2127 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2128 kobject_get(&rdev
->kobj
);
2129 queue_work(md_misc_wq
, &rdev
->del_work
);
2133 * prevent the device from being mounted, repartitioned or
2134 * otherwise reused by a RAID array (or any other kernel
2135 * subsystem), by bd_claiming the device.
2137 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2140 struct block_device
*bdev
;
2141 char b
[BDEVNAME_SIZE
];
2143 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2144 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2146 printk(KERN_ERR
"md: could not open %s.\n",
2147 __bdevname(dev
, b
));
2148 return PTR_ERR(bdev
);
2154 static void unlock_rdev(struct md_rdev
*rdev
)
2156 struct block_device
*bdev
= rdev
->bdev
;
2160 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2163 void md_autodetect_dev(dev_t dev
);
2165 static void export_rdev(struct md_rdev
* rdev
)
2167 char b
[BDEVNAME_SIZE
];
2168 printk(KERN_INFO
"md: export_rdev(%s)\n",
2169 bdevname(rdev
->bdev
,b
));
2172 md_rdev_clear(rdev
);
2174 if (test_bit(AutoDetected
, &rdev
->flags
))
2175 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2178 kobject_put(&rdev
->kobj
);
2181 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2183 unbind_rdev_from_array(rdev
);
2187 static void export_array(struct mddev
*mddev
)
2189 struct md_rdev
*rdev
, *tmp
;
2191 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2196 kick_rdev_from_array(rdev
);
2198 if (!list_empty(&mddev
->disks
))
2200 mddev
->raid_disks
= 0;
2201 mddev
->major_version
= 0;
2204 static void print_desc(mdp_disk_t
*desc
)
2206 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2207 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2210 static void print_sb_90(mdp_super_t
*sb
)
2215 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2216 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2217 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2219 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2220 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2221 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2222 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2223 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2224 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2225 sb
->failed_disks
, sb
->spare_disks
,
2226 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2229 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2232 desc
= sb
->disks
+ i
;
2233 if (desc
->number
|| desc
->major
|| desc
->minor
||
2234 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2235 printk(" D %2d: ", i
);
2239 printk(KERN_INFO
"md: THIS: ");
2240 print_desc(&sb
->this_disk
);
2243 static void print_sb_1(struct mdp_superblock_1
*sb
)
2247 uuid
= sb
->set_uuid
;
2249 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2250 "md: Name: \"%s\" CT:%llu\n",
2251 le32_to_cpu(sb
->major_version
),
2252 le32_to_cpu(sb
->feature_map
),
2255 (unsigned long long)le64_to_cpu(sb
->ctime
)
2256 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2258 uuid
= sb
->device_uuid
;
2260 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2262 "md: Dev:%08x UUID: %pU\n"
2263 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2264 "md: (MaxDev:%u) \n",
2265 le32_to_cpu(sb
->level
),
2266 (unsigned long long)le64_to_cpu(sb
->size
),
2267 le32_to_cpu(sb
->raid_disks
),
2268 le32_to_cpu(sb
->layout
),
2269 le32_to_cpu(sb
->chunksize
),
2270 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2271 (unsigned long long)le64_to_cpu(sb
->data_size
),
2272 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2273 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2274 le32_to_cpu(sb
->dev_number
),
2277 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2278 (unsigned long long)le64_to_cpu(sb
->events
),
2279 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2280 le32_to_cpu(sb
->sb_csum
),
2281 le32_to_cpu(sb
->max_dev
)
2285 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2287 char b
[BDEVNAME_SIZE
];
2288 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2289 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2290 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2292 if (rdev
->sb_loaded
) {
2293 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2294 switch (major_version
) {
2296 print_sb_90(page_address(rdev
->sb_page
));
2299 print_sb_1(page_address(rdev
->sb_page
));
2303 printk(KERN_INFO
"md: no rdev superblock!\n");
2306 static void md_print_devices(void)
2308 struct list_head
*tmp
;
2309 struct md_rdev
*rdev
;
2310 struct mddev
*mddev
;
2311 char b
[BDEVNAME_SIZE
];
2314 printk("md: **********************************\n");
2315 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2316 printk("md: **********************************\n");
2317 for_each_mddev(mddev
, tmp
) {
2320 bitmap_print_sb(mddev
->bitmap
);
2322 printk("%s: ", mdname(mddev
));
2323 rdev_for_each(rdev
, mddev
)
2324 printk("<%s>", bdevname(rdev
->bdev
,b
));
2327 rdev_for_each(rdev
, mddev
)
2328 print_rdev(rdev
, mddev
->major_version
);
2330 printk("md: **********************************\n");
2335 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2337 /* Update each superblock (in-memory image), but
2338 * if we are allowed to, skip spares which already
2339 * have the right event counter, or have one earlier
2340 * (which would mean they aren't being marked as dirty
2341 * with the rest of the array)
2343 struct md_rdev
*rdev
;
2344 rdev_for_each(rdev
, mddev
) {
2345 if (rdev
->sb_events
== mddev
->events
||
2347 rdev
->raid_disk
< 0 &&
2348 rdev
->sb_events
+1 == mddev
->events
)) {
2349 /* Don't update this superblock */
2350 rdev
->sb_loaded
= 2;
2352 sync_super(mddev
, rdev
);
2353 rdev
->sb_loaded
= 1;
2358 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2360 struct md_rdev
*rdev
;
2363 int any_badblocks_changed
= 0;
2367 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2371 /* First make sure individual recovery_offsets are correct */
2372 rdev_for_each(rdev
, mddev
) {
2373 if (rdev
->raid_disk
>= 0 &&
2374 mddev
->delta_disks
>= 0 &&
2375 !test_bit(In_sync
, &rdev
->flags
) &&
2376 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2377 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2380 if (!mddev
->persistent
) {
2381 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2382 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2383 if (!mddev
->external
) {
2384 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2385 rdev_for_each(rdev
, mddev
) {
2386 if (rdev
->badblocks
.changed
) {
2387 rdev
->badblocks
.changed
= 0;
2388 md_ack_all_badblocks(&rdev
->badblocks
);
2389 md_error(mddev
, rdev
);
2391 clear_bit(Blocked
, &rdev
->flags
);
2392 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2393 wake_up(&rdev
->blocked_wait
);
2396 wake_up(&mddev
->sb_wait
);
2400 spin_lock_irq(&mddev
->write_lock
);
2402 mddev
->utime
= get_seconds();
2404 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2406 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2407 /* just a clean<-> dirty transition, possibly leave spares alone,
2408 * though if events isn't the right even/odd, we will have to do
2414 if (mddev
->degraded
)
2415 /* If the array is degraded, then skipping spares is both
2416 * dangerous and fairly pointless.
2417 * Dangerous because a device that was removed from the array
2418 * might have a event_count that still looks up-to-date,
2419 * so it can be re-added without a resync.
2420 * Pointless because if there are any spares to skip,
2421 * then a recovery will happen and soon that array won't
2422 * be degraded any more and the spare can go back to sleep then.
2426 sync_req
= mddev
->in_sync
;
2428 /* If this is just a dirty<->clean transition, and the array is clean
2429 * and 'events' is odd, we can roll back to the previous clean state */
2431 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2432 && mddev
->can_decrease_events
2433 && mddev
->events
!= 1) {
2435 mddev
->can_decrease_events
= 0;
2437 /* otherwise we have to go forward and ... */
2439 mddev
->can_decrease_events
= nospares
;
2442 if (!mddev
->events
) {
2444 * oops, this 64-bit counter should never wrap.
2445 * Either we are in around ~1 trillion A.C., assuming
2446 * 1 reboot per second, or we have a bug:
2452 rdev_for_each(rdev
, mddev
) {
2453 if (rdev
->badblocks
.changed
)
2454 any_badblocks_changed
++;
2455 if (test_bit(Faulty
, &rdev
->flags
))
2456 set_bit(FaultRecorded
, &rdev
->flags
);
2459 sync_sbs(mddev
, nospares
);
2460 spin_unlock_irq(&mddev
->write_lock
);
2462 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2463 mdname(mddev
), mddev
->in_sync
);
2465 bitmap_update_sb(mddev
->bitmap
);
2466 rdev_for_each(rdev
, mddev
) {
2467 char b
[BDEVNAME_SIZE
];
2469 if (rdev
->sb_loaded
!= 1)
2470 continue; /* no noise on spare devices */
2472 if (!test_bit(Faulty
, &rdev
->flags
) &&
2473 rdev
->saved_raid_disk
== -1) {
2474 md_super_write(mddev
,rdev
,
2475 rdev
->sb_start
, rdev
->sb_size
,
2477 pr_debug("md: (write) %s's sb offset: %llu\n",
2478 bdevname(rdev
->bdev
, b
),
2479 (unsigned long long)rdev
->sb_start
);
2480 rdev
->sb_events
= mddev
->events
;
2481 if (rdev
->badblocks
.size
) {
2482 md_super_write(mddev
, rdev
,
2483 rdev
->badblocks
.sector
,
2484 rdev
->badblocks
.size
<< 9,
2486 rdev
->badblocks
.size
= 0;
2489 } else if (test_bit(Faulty
, &rdev
->flags
))
2490 pr_debug("md: %s (skipping faulty)\n",
2491 bdevname(rdev
->bdev
, b
));
2493 pr_debug("(skipping incremental s/r ");
2495 if (mddev
->level
== LEVEL_MULTIPATH
)
2496 /* only need to write one superblock... */
2499 md_super_wait(mddev
);
2500 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2502 spin_lock_irq(&mddev
->write_lock
);
2503 if (mddev
->in_sync
!= sync_req
||
2504 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2505 /* have to write it out again */
2506 spin_unlock_irq(&mddev
->write_lock
);
2509 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2510 spin_unlock_irq(&mddev
->write_lock
);
2511 wake_up(&mddev
->sb_wait
);
2512 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2513 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2515 rdev_for_each(rdev
, mddev
) {
2516 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2517 clear_bit(Blocked
, &rdev
->flags
);
2519 if (any_badblocks_changed
)
2520 md_ack_all_badblocks(&rdev
->badblocks
);
2521 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2522 wake_up(&rdev
->blocked_wait
);
2526 /* words written to sysfs files may, or may not, be \n terminated.
2527 * We want to accept with case. For this we use cmd_match.
2529 static int cmd_match(const char *cmd
, const char *str
)
2531 /* See if cmd, written into a sysfs file, matches
2532 * str. They must either be the same, or cmd can
2533 * have a trailing newline
2535 while (*cmd
&& *str
&& *cmd
== *str
) {
2546 struct rdev_sysfs_entry
{
2547 struct attribute attr
;
2548 ssize_t (*show
)(struct md_rdev
*, char *);
2549 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2553 state_show(struct md_rdev
*rdev
, char *page
)
2558 if (test_bit(Faulty
, &rdev
->flags
) ||
2559 rdev
->badblocks
.unacked_exist
) {
2560 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2563 if (test_bit(In_sync
, &rdev
->flags
)) {
2564 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2567 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2568 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2571 if (test_bit(Blocked
, &rdev
->flags
) ||
2572 (rdev
->badblocks
.unacked_exist
2573 && !test_bit(Faulty
, &rdev
->flags
))) {
2574 len
+= sprintf(page
+len
, "%sblocked", sep
);
2577 if (!test_bit(Faulty
, &rdev
->flags
) &&
2578 !test_bit(In_sync
, &rdev
->flags
)) {
2579 len
+= sprintf(page
+len
, "%sspare", sep
);
2582 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2583 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2586 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2587 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2590 if (test_bit(Replacement
, &rdev
->flags
)) {
2591 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2595 return len
+sprintf(page
+len
, "\n");
2599 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2602 * faulty - simulates an error
2603 * remove - disconnects the device
2604 * writemostly - sets write_mostly
2605 * -writemostly - clears write_mostly
2606 * blocked - sets the Blocked flags
2607 * -blocked - clears the Blocked and possibly simulates an error
2608 * insync - sets Insync providing device isn't active
2609 * write_error - sets WriteErrorSeen
2610 * -write_error - clears WriteErrorSeen
2613 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2614 md_error(rdev
->mddev
, rdev
);
2615 if (test_bit(Faulty
, &rdev
->flags
))
2619 } else if (cmd_match(buf
, "remove")) {
2620 if (rdev
->raid_disk
>= 0)
2623 struct mddev
*mddev
= rdev
->mddev
;
2624 kick_rdev_from_array(rdev
);
2626 md_update_sb(mddev
, 1);
2627 md_new_event(mddev
);
2630 } else if (cmd_match(buf
, "writemostly")) {
2631 set_bit(WriteMostly
, &rdev
->flags
);
2633 } else if (cmd_match(buf
, "-writemostly")) {
2634 clear_bit(WriteMostly
, &rdev
->flags
);
2636 } else if (cmd_match(buf
, "blocked")) {
2637 set_bit(Blocked
, &rdev
->flags
);
2639 } else if (cmd_match(buf
, "-blocked")) {
2640 if (!test_bit(Faulty
, &rdev
->flags
) &&
2641 rdev
->badblocks
.unacked_exist
) {
2642 /* metadata handler doesn't understand badblocks,
2643 * so we need to fail the device
2645 md_error(rdev
->mddev
, rdev
);
2647 clear_bit(Blocked
, &rdev
->flags
);
2648 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2649 wake_up(&rdev
->blocked_wait
);
2650 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2651 md_wakeup_thread(rdev
->mddev
->thread
);
2654 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2655 set_bit(In_sync
, &rdev
->flags
);
2657 } else if (cmd_match(buf
, "write_error")) {
2658 set_bit(WriteErrorSeen
, &rdev
->flags
);
2660 } else if (cmd_match(buf
, "-write_error")) {
2661 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2663 } else if (cmd_match(buf
, "want_replacement")) {
2664 /* Any non-spare device that is not a replacement can
2665 * become want_replacement at any time, but we then need to
2666 * check if recovery is needed.
2668 if (rdev
->raid_disk
>= 0 &&
2669 !test_bit(Replacement
, &rdev
->flags
))
2670 set_bit(WantReplacement
, &rdev
->flags
);
2671 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2672 md_wakeup_thread(rdev
->mddev
->thread
);
2674 } else if (cmd_match(buf
, "-want_replacement")) {
2675 /* Clearing 'want_replacement' is always allowed.
2676 * Once replacements starts it is too late though.
2679 clear_bit(WantReplacement
, &rdev
->flags
);
2680 } else if (cmd_match(buf
, "replacement")) {
2681 /* Can only set a device as a replacement when array has not
2682 * yet been started. Once running, replacement is automatic
2683 * from spares, or by assigning 'slot'.
2685 if (rdev
->mddev
->pers
)
2688 set_bit(Replacement
, &rdev
->flags
);
2691 } else if (cmd_match(buf
, "-replacement")) {
2692 /* Similarly, can only clear Replacement before start */
2693 if (rdev
->mddev
->pers
)
2696 clear_bit(Replacement
, &rdev
->flags
);
2701 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2702 return err
? err
: len
;
2704 static struct rdev_sysfs_entry rdev_state
=
2705 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2708 errors_show(struct md_rdev
*rdev
, char *page
)
2710 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2714 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2717 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2718 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2719 atomic_set(&rdev
->corrected_errors
, n
);
2724 static struct rdev_sysfs_entry rdev_errors
=
2725 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2728 slot_show(struct md_rdev
*rdev
, char *page
)
2730 if (rdev
->raid_disk
< 0)
2731 return sprintf(page
, "none\n");
2733 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2737 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2741 int slot
= simple_strtoul(buf
, &e
, 10);
2742 if (strncmp(buf
, "none", 4)==0)
2744 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2746 if (rdev
->mddev
->pers
&& slot
== -1) {
2747 /* Setting 'slot' on an active array requires also
2748 * updating the 'rd%d' link, and communicating
2749 * with the personality with ->hot_*_disk.
2750 * For now we only support removing
2751 * failed/spare devices. This normally happens automatically,
2752 * but not when the metadata is externally managed.
2754 if (rdev
->raid_disk
== -1)
2756 /* personality does all needed checks */
2757 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2759 clear_bit(Blocked
, &rdev
->flags
);
2760 remove_and_add_spares(rdev
->mddev
, rdev
);
2761 if (rdev
->raid_disk
>= 0)
2763 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2764 md_wakeup_thread(rdev
->mddev
->thread
);
2765 } else if (rdev
->mddev
->pers
) {
2766 /* Activating a spare .. or possibly reactivating
2767 * if we ever get bitmaps working here.
2770 if (rdev
->raid_disk
!= -1)
2773 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2776 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2779 if (slot
>= rdev
->mddev
->raid_disks
&&
2780 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2783 rdev
->raid_disk
= slot
;
2784 if (test_bit(In_sync
, &rdev
->flags
))
2785 rdev
->saved_raid_disk
= slot
;
2787 rdev
->saved_raid_disk
= -1;
2788 clear_bit(In_sync
, &rdev
->flags
);
2789 err
= rdev
->mddev
->pers
->
2790 hot_add_disk(rdev
->mddev
, rdev
);
2792 rdev
->raid_disk
= -1;
2795 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2796 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2797 /* failure here is OK */;
2798 /* don't wakeup anyone, leave that to userspace. */
2800 if (slot
>= rdev
->mddev
->raid_disks
&&
2801 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2803 rdev
->raid_disk
= slot
;
2804 /* assume it is working */
2805 clear_bit(Faulty
, &rdev
->flags
);
2806 clear_bit(WriteMostly
, &rdev
->flags
);
2807 set_bit(In_sync
, &rdev
->flags
);
2808 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2814 static struct rdev_sysfs_entry rdev_slot
=
2815 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2818 offset_show(struct md_rdev
*rdev
, char *page
)
2820 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2824 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2826 unsigned long long offset
;
2827 if (kstrtoull(buf
, 10, &offset
) < 0)
2829 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2831 if (rdev
->sectors
&& rdev
->mddev
->external
)
2832 /* Must set offset before size, so overlap checks
2835 rdev
->data_offset
= offset
;
2836 rdev
->new_data_offset
= offset
;
2840 static struct rdev_sysfs_entry rdev_offset
=
2841 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2843 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2845 return sprintf(page
, "%llu\n",
2846 (unsigned long long)rdev
->new_data_offset
);
2849 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2850 const char *buf
, size_t len
)
2852 unsigned long long new_offset
;
2853 struct mddev
*mddev
= rdev
->mddev
;
2855 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2858 if (mddev
->sync_thread
)
2860 if (new_offset
== rdev
->data_offset
)
2861 /* reset is always permitted */
2863 else if (new_offset
> rdev
->data_offset
) {
2864 /* must not push array size beyond rdev_sectors */
2865 if (new_offset
- rdev
->data_offset
2866 + mddev
->dev_sectors
> rdev
->sectors
)
2869 /* Metadata worries about other space details. */
2871 /* decreasing the offset is inconsistent with a backwards
2874 if (new_offset
< rdev
->data_offset
&&
2875 mddev
->reshape_backwards
)
2877 /* Increasing offset is inconsistent with forwards
2878 * reshape. reshape_direction should be set to
2879 * 'backwards' first.
2881 if (new_offset
> rdev
->data_offset
&&
2882 !mddev
->reshape_backwards
)
2885 if (mddev
->pers
&& mddev
->persistent
&&
2886 !super_types
[mddev
->major_version
]
2887 .allow_new_offset(rdev
, new_offset
))
2889 rdev
->new_data_offset
= new_offset
;
2890 if (new_offset
> rdev
->data_offset
)
2891 mddev
->reshape_backwards
= 1;
2892 else if (new_offset
< rdev
->data_offset
)
2893 mddev
->reshape_backwards
= 0;
2897 static struct rdev_sysfs_entry rdev_new_offset
=
2898 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2901 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2903 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2906 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2908 /* check if two start/length pairs overlap */
2916 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2918 unsigned long long blocks
;
2921 if (kstrtoull(buf
, 10, &blocks
) < 0)
2924 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2925 return -EINVAL
; /* sector conversion overflow */
2928 if (new != blocks
* 2)
2929 return -EINVAL
; /* unsigned long long to sector_t overflow */
2936 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2938 struct mddev
*my_mddev
= rdev
->mddev
;
2939 sector_t oldsectors
= rdev
->sectors
;
2942 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2944 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2945 return -EINVAL
; /* too confusing */
2946 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2947 if (my_mddev
->persistent
) {
2948 sectors
= super_types
[my_mddev
->major_version
].
2949 rdev_size_change(rdev
, sectors
);
2952 } else if (!sectors
)
2953 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2955 if (!my_mddev
->pers
->resize
)
2956 /* Cannot change size for RAID0 or Linear etc */
2959 if (sectors
< my_mddev
->dev_sectors
)
2960 return -EINVAL
; /* component must fit device */
2962 rdev
->sectors
= sectors
;
2963 if (sectors
> oldsectors
&& my_mddev
->external
) {
2964 /* need to check that all other rdevs with the same ->bdev
2965 * do not overlap. We need to unlock the mddev to avoid
2966 * a deadlock. We have already changed rdev->sectors, and if
2967 * we have to change it back, we will have the lock again.
2969 struct mddev
*mddev
;
2971 struct list_head
*tmp
;
2973 mddev_unlock(my_mddev
);
2974 for_each_mddev(mddev
, tmp
) {
2975 struct md_rdev
*rdev2
;
2977 mddev_lock_nointr(mddev
);
2978 rdev_for_each(rdev2
, mddev
)
2979 if (rdev
->bdev
== rdev2
->bdev
&&
2981 overlaps(rdev
->data_offset
, rdev
->sectors
,
2987 mddev_unlock(mddev
);
2993 mddev_lock_nointr(my_mddev
);
2995 /* Someone else could have slipped in a size
2996 * change here, but doing so is just silly.
2997 * We put oldsectors back because we *know* it is
2998 * safe, and trust userspace not to race with
3001 rdev
->sectors
= oldsectors
;
3008 static struct rdev_sysfs_entry rdev_size
=
3009 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3012 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3014 unsigned long long recovery_start
= rdev
->recovery_offset
;
3016 if (test_bit(In_sync
, &rdev
->flags
) ||
3017 recovery_start
== MaxSector
)
3018 return sprintf(page
, "none\n");
3020 return sprintf(page
, "%llu\n", recovery_start
);
3023 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3025 unsigned long long recovery_start
;
3027 if (cmd_match(buf
, "none"))
3028 recovery_start
= MaxSector
;
3029 else if (kstrtoull(buf
, 10, &recovery_start
))
3032 if (rdev
->mddev
->pers
&&
3033 rdev
->raid_disk
>= 0)
3036 rdev
->recovery_offset
= recovery_start
;
3037 if (recovery_start
== MaxSector
)
3038 set_bit(In_sync
, &rdev
->flags
);
3040 clear_bit(In_sync
, &rdev
->flags
);
3044 static struct rdev_sysfs_entry rdev_recovery_start
=
3045 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3049 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3051 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3053 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3055 return badblocks_show(&rdev
->badblocks
, page
, 0);
3057 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3059 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3060 /* Maybe that ack was all we needed */
3061 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3062 wake_up(&rdev
->blocked_wait
);
3065 static struct rdev_sysfs_entry rdev_bad_blocks
=
3066 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3069 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3071 return badblocks_show(&rdev
->badblocks
, page
, 1);
3073 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3075 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3077 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3078 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3080 static struct attribute
*rdev_default_attrs
[] = {
3085 &rdev_new_offset
.attr
,
3087 &rdev_recovery_start
.attr
,
3088 &rdev_bad_blocks
.attr
,
3089 &rdev_unack_bad_blocks
.attr
,
3093 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3095 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3096 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3097 struct mddev
*mddev
= rdev
->mddev
;
3103 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3105 if (rdev
->mddev
== NULL
)
3108 rv
= entry
->show(rdev
, page
);
3109 mddev_unlock(mddev
);
3115 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3116 const char *page
, size_t length
)
3118 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3119 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3121 struct mddev
*mddev
= rdev
->mddev
;
3125 if (!capable(CAP_SYS_ADMIN
))
3127 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3129 if (rdev
->mddev
== NULL
)
3132 rv
= entry
->store(rdev
, page
, length
);
3133 mddev_unlock(mddev
);
3138 static void rdev_free(struct kobject
*ko
)
3140 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3143 static const struct sysfs_ops rdev_sysfs_ops
= {
3144 .show
= rdev_attr_show
,
3145 .store
= rdev_attr_store
,
3147 static struct kobj_type rdev_ktype
= {
3148 .release
= rdev_free
,
3149 .sysfs_ops
= &rdev_sysfs_ops
,
3150 .default_attrs
= rdev_default_attrs
,
3153 int md_rdev_init(struct md_rdev
*rdev
)
3156 rdev
->saved_raid_disk
= -1;
3157 rdev
->raid_disk
= -1;
3159 rdev
->data_offset
= 0;
3160 rdev
->new_data_offset
= 0;
3161 rdev
->sb_events
= 0;
3162 rdev
->last_read_error
.tv_sec
= 0;
3163 rdev
->last_read_error
.tv_nsec
= 0;
3164 rdev
->sb_loaded
= 0;
3165 rdev
->bb_page
= NULL
;
3166 atomic_set(&rdev
->nr_pending
, 0);
3167 atomic_set(&rdev
->read_errors
, 0);
3168 atomic_set(&rdev
->corrected_errors
, 0);
3170 INIT_LIST_HEAD(&rdev
->same_set
);
3171 init_waitqueue_head(&rdev
->blocked_wait
);
3173 /* Add space to store bad block list.
3174 * This reserves the space even on arrays where it cannot
3175 * be used - I wonder if that matters
3177 rdev
->badblocks
.count
= 0;
3178 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3179 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3180 seqlock_init(&rdev
->badblocks
.lock
);
3181 if (rdev
->badblocks
.page
== NULL
)
3186 EXPORT_SYMBOL_GPL(md_rdev_init
);
3188 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3190 * mark the device faulty if:
3192 * - the device is nonexistent (zero size)
3193 * - the device has no valid superblock
3195 * a faulty rdev _never_ has rdev->sb set.
3197 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3199 char b
[BDEVNAME_SIZE
];
3201 struct md_rdev
*rdev
;
3204 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3206 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3207 return ERR_PTR(-ENOMEM
);
3210 err
= md_rdev_init(rdev
);
3213 err
= alloc_disk_sb(rdev
);
3217 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3221 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3223 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3226 "md: %s has zero or unknown size, marking faulty!\n",
3227 bdevname(rdev
->bdev
,b
));
3232 if (super_format
>= 0) {
3233 err
= super_types
[super_format
].
3234 load_super(rdev
, NULL
, super_minor
);
3235 if (err
== -EINVAL
) {
3237 "md: %s does not have a valid v%d.%d "
3238 "superblock, not importing!\n",
3239 bdevname(rdev
->bdev
,b
),
3240 super_format
, super_minor
);
3245 "md: could not read %s's sb, not importing!\n",
3246 bdevname(rdev
->bdev
,b
));
3256 md_rdev_clear(rdev
);
3258 return ERR_PTR(err
);
3262 * Check a full RAID array for plausibility
3266 static void analyze_sbs(struct mddev
* mddev
)
3269 struct md_rdev
*rdev
, *freshest
, *tmp
;
3270 char b
[BDEVNAME_SIZE
];
3273 rdev_for_each_safe(rdev
, tmp
, mddev
)
3274 switch (super_types
[mddev
->major_version
].
3275 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3283 "md: fatal superblock inconsistency in %s"
3284 " -- removing from array\n",
3285 bdevname(rdev
->bdev
,b
));
3286 kick_rdev_from_array(rdev
);
3290 super_types
[mddev
->major_version
].
3291 validate_super(mddev
, freshest
);
3294 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3295 if (mddev
->max_disks
&&
3296 (rdev
->desc_nr
>= mddev
->max_disks
||
3297 i
> mddev
->max_disks
)) {
3299 "md: %s: %s: only %d devices permitted\n",
3300 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3302 kick_rdev_from_array(rdev
);
3305 if (rdev
!= freshest
)
3306 if (super_types
[mddev
->major_version
].
3307 validate_super(mddev
, rdev
)) {
3308 printk(KERN_WARNING
"md: kicking non-fresh %s"
3310 bdevname(rdev
->bdev
,b
));
3311 kick_rdev_from_array(rdev
);
3314 if (mddev
->level
== LEVEL_MULTIPATH
) {
3315 rdev
->desc_nr
= i
++;
3316 rdev
->raid_disk
= rdev
->desc_nr
;
3317 set_bit(In_sync
, &rdev
->flags
);
3318 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3319 rdev
->raid_disk
= -1;
3320 clear_bit(In_sync
, &rdev
->flags
);
3325 /* Read a fixed-point number.
3326 * Numbers in sysfs attributes should be in "standard" units where
3327 * possible, so time should be in seconds.
3328 * However we internally use a a much smaller unit such as
3329 * milliseconds or jiffies.
3330 * This function takes a decimal number with a possible fractional
3331 * component, and produces an integer which is the result of
3332 * multiplying that number by 10^'scale'.
3333 * all without any floating-point arithmetic.
3335 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3337 unsigned long result
= 0;
3339 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3342 else if (decimals
< scale
) {
3345 result
= result
* 10 + value
;
3357 while (decimals
< scale
) {
3366 static void md_safemode_timeout(unsigned long data
);
3369 safe_delay_show(struct mddev
*mddev
, char *page
)
3371 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3372 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3375 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3379 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3382 mddev
->safemode_delay
= 0;
3384 unsigned long old_delay
= mddev
->safemode_delay
;
3385 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3386 if (mddev
->safemode_delay
== 0)
3387 mddev
->safemode_delay
= 1;
3388 if (mddev
->safemode_delay
< old_delay
|| old_delay
== 0)
3389 md_safemode_timeout((unsigned long)mddev
);
3393 static struct md_sysfs_entry md_safe_delay
=
3394 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3397 level_show(struct mddev
*mddev
, char *page
)
3399 struct md_personality
*p
= mddev
->pers
;
3401 return sprintf(page
, "%s\n", p
->name
);
3402 else if (mddev
->clevel
[0])
3403 return sprintf(page
, "%s\n", mddev
->clevel
);
3404 else if (mddev
->level
!= LEVEL_NONE
)
3405 return sprintf(page
, "%d\n", mddev
->level
);
3411 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3415 struct md_personality
*pers
;
3418 struct md_rdev
*rdev
;
3420 if (mddev
->pers
== NULL
) {
3423 if (len
>= sizeof(mddev
->clevel
))
3425 strncpy(mddev
->clevel
, buf
, len
);
3426 if (mddev
->clevel
[len
-1] == '\n')
3428 mddev
->clevel
[len
] = 0;
3429 mddev
->level
= LEVEL_NONE
;
3433 /* request to change the personality. Need to ensure:
3434 * - array is not engaged in resync/recovery/reshape
3435 * - old personality can be suspended
3436 * - new personality will access other array.
3439 if (mddev
->sync_thread
||
3440 mddev
->reshape_position
!= MaxSector
||
3441 mddev
->sysfs_active
)
3444 if (!mddev
->pers
->quiesce
) {
3445 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3446 mdname(mddev
), mddev
->pers
->name
);
3450 /* Now find the new personality */
3451 if (len
== 0 || len
>= sizeof(clevel
))
3453 strncpy(clevel
, buf
, len
);
3454 if (clevel
[len
-1] == '\n')
3457 if (kstrtol(clevel
, 10, &level
))
3460 if (request_module("md-%s", clevel
) != 0)
3461 request_module("md-level-%s", clevel
);
3462 spin_lock(&pers_lock
);
3463 pers
= find_pers(level
, clevel
);
3464 if (!pers
|| !try_module_get(pers
->owner
)) {
3465 spin_unlock(&pers_lock
);
3466 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3469 spin_unlock(&pers_lock
);
3471 if (pers
== mddev
->pers
) {
3472 /* Nothing to do! */
3473 module_put(pers
->owner
);
3476 if (!pers
->takeover
) {
3477 module_put(pers
->owner
);
3478 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3479 mdname(mddev
), clevel
);
3483 rdev_for_each(rdev
, mddev
)
3484 rdev
->new_raid_disk
= rdev
->raid_disk
;
3486 /* ->takeover must set new_* and/or delta_disks
3487 * if it succeeds, and may set them when it fails.
3489 priv
= pers
->takeover(mddev
);
3491 mddev
->new_level
= mddev
->level
;
3492 mddev
->new_layout
= mddev
->layout
;
3493 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3494 mddev
->raid_disks
-= mddev
->delta_disks
;
3495 mddev
->delta_disks
= 0;
3496 mddev
->reshape_backwards
= 0;
3497 module_put(pers
->owner
);
3498 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3499 mdname(mddev
), clevel
);
3500 return PTR_ERR(priv
);
3503 /* Looks like we have a winner */
3504 mddev_suspend(mddev
);
3505 mddev
->pers
->stop(mddev
);
3507 if (mddev
->pers
->sync_request
== NULL
&&
3508 pers
->sync_request
!= NULL
) {
3509 /* need to add the md_redundancy_group */
3510 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3512 "md: cannot register extra attributes for %s\n",
3514 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3516 if (mddev
->pers
->sync_request
!= NULL
&&
3517 pers
->sync_request
== NULL
) {
3518 /* need to remove the md_redundancy_group */
3519 if (mddev
->to_remove
== NULL
)
3520 mddev
->to_remove
= &md_redundancy_group
;
3523 if (mddev
->pers
->sync_request
== NULL
&&
3525 /* We are converting from a no-redundancy array
3526 * to a redundancy array and metadata is managed
3527 * externally so we need to be sure that writes
3528 * won't block due to a need to transition
3530 * until external management is started.
3533 mddev
->safemode_delay
= 0;
3534 mddev
->safemode
= 0;
3537 rdev_for_each(rdev
, mddev
) {
3538 if (rdev
->raid_disk
< 0)
3540 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3541 rdev
->new_raid_disk
= -1;
3542 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3544 sysfs_unlink_rdev(mddev
, rdev
);
3546 rdev_for_each(rdev
, mddev
) {
3547 if (rdev
->raid_disk
< 0)
3549 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3551 rdev
->raid_disk
= rdev
->new_raid_disk
;
3552 if (rdev
->raid_disk
< 0)
3553 clear_bit(In_sync
, &rdev
->flags
);
3555 if (sysfs_link_rdev(mddev
, rdev
))
3556 printk(KERN_WARNING
"md: cannot register rd%d"
3557 " for %s after level change\n",
3558 rdev
->raid_disk
, mdname(mddev
));
3562 module_put(mddev
->pers
->owner
);
3564 mddev
->private = priv
;
3565 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3566 mddev
->level
= mddev
->new_level
;
3567 mddev
->layout
= mddev
->new_layout
;
3568 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3569 mddev
->delta_disks
= 0;
3570 mddev
->reshape_backwards
= 0;
3571 mddev
->degraded
= 0;
3572 if (mddev
->pers
->sync_request
== NULL
) {
3573 /* this is now an array without redundancy, so
3574 * it must always be in_sync
3577 del_timer_sync(&mddev
->safemode_timer
);
3579 blk_set_stacking_limits(&mddev
->queue
->limits
);
3581 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3582 mddev_resume(mddev
);
3583 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3584 md_new_event(mddev
);
3588 static struct md_sysfs_entry md_level
=
3589 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3593 layout_show(struct mddev
*mddev
, char *page
)
3595 /* just a number, not meaningful for all levels */
3596 if (mddev
->reshape_position
!= MaxSector
&&
3597 mddev
->layout
!= mddev
->new_layout
)
3598 return sprintf(page
, "%d (%d)\n",
3599 mddev
->new_layout
, mddev
->layout
);
3600 return sprintf(page
, "%d\n", mddev
->layout
);
3604 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3607 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3609 if (!*buf
|| (*e
&& *e
!= '\n'))
3614 if (mddev
->pers
->check_reshape
== NULL
)
3616 mddev
->new_layout
= n
;
3617 err
= mddev
->pers
->check_reshape(mddev
);
3619 mddev
->new_layout
= mddev
->layout
;
3623 mddev
->new_layout
= n
;
3624 if (mddev
->reshape_position
== MaxSector
)
3629 static struct md_sysfs_entry md_layout
=
3630 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3634 raid_disks_show(struct mddev
*mddev
, char *page
)
3636 if (mddev
->raid_disks
== 0)
3638 if (mddev
->reshape_position
!= MaxSector
&&
3639 mddev
->delta_disks
!= 0)
3640 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3641 mddev
->raid_disks
- mddev
->delta_disks
);
3642 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3645 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3648 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3652 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3654 if (!*buf
|| (*e
&& *e
!= '\n'))
3658 rv
= update_raid_disks(mddev
, n
);
3659 else if (mddev
->reshape_position
!= MaxSector
) {
3660 struct md_rdev
*rdev
;
3661 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3663 rdev_for_each(rdev
, mddev
) {
3665 rdev
->data_offset
< rdev
->new_data_offset
)
3668 rdev
->data_offset
> rdev
->new_data_offset
)
3671 mddev
->delta_disks
= n
- olddisks
;
3672 mddev
->raid_disks
= n
;
3673 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3675 mddev
->raid_disks
= n
;
3676 return rv
? rv
: len
;
3678 static struct md_sysfs_entry md_raid_disks
=
3679 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3682 chunk_size_show(struct mddev
*mddev
, char *page
)
3684 if (mddev
->reshape_position
!= MaxSector
&&
3685 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3686 return sprintf(page
, "%d (%d)\n",
3687 mddev
->new_chunk_sectors
<< 9,
3688 mddev
->chunk_sectors
<< 9);
3689 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3693 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3696 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3698 if (!*buf
|| (*e
&& *e
!= '\n'))
3703 if (mddev
->pers
->check_reshape
== NULL
)
3705 mddev
->new_chunk_sectors
= n
>> 9;
3706 err
= mddev
->pers
->check_reshape(mddev
);
3708 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3712 mddev
->new_chunk_sectors
= n
>> 9;
3713 if (mddev
->reshape_position
== MaxSector
)
3714 mddev
->chunk_sectors
= n
>> 9;
3718 static struct md_sysfs_entry md_chunk_size
=
3719 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3722 resync_start_show(struct mddev
*mddev
, char *page
)
3724 if (mddev
->recovery_cp
== MaxSector
)
3725 return sprintf(page
, "none\n");
3726 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3730 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3733 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3735 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3737 if (cmd_match(buf
, "none"))
3739 else if (!*buf
|| (*e
&& *e
!= '\n'))
3742 mddev
->recovery_cp
= n
;
3744 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3747 static struct md_sysfs_entry md_resync_start
=
3748 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3751 * The array state can be:
3754 * No devices, no size, no level
3755 * Equivalent to STOP_ARRAY ioctl
3757 * May have some settings, but array is not active
3758 * all IO results in error
3759 * When written, doesn't tear down array, but just stops it
3760 * suspended (not supported yet)
3761 * All IO requests will block. The array can be reconfigured.
3762 * Writing this, if accepted, will block until array is quiescent
3764 * no resync can happen. no superblocks get written.
3765 * write requests fail
3767 * like readonly, but behaves like 'clean' on a write request.
3769 * clean - no pending writes, but otherwise active.
3770 * When written to inactive array, starts without resync
3771 * If a write request arrives then
3772 * if metadata is known, mark 'dirty' and switch to 'active'.
3773 * if not known, block and switch to write-pending
3774 * If written to an active array that has pending writes, then fails.
3776 * fully active: IO and resync can be happening.
3777 * When written to inactive array, starts with resync
3780 * clean, but writes are blocked waiting for 'active' to be written.
3783 * like active, but no writes have been seen for a while (100msec).
3786 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3787 write_pending
, active_idle
, bad_word
};
3788 static char *array_states
[] = {
3789 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3790 "write-pending", "active-idle", NULL
};
3792 static int match_word(const char *word
, char **list
)
3795 for (n
=0; list
[n
]; n
++)
3796 if (cmd_match(word
, list
[n
]))
3802 array_state_show(struct mddev
*mddev
, char *page
)
3804 enum array_state st
= inactive
;
3817 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3819 else if (mddev
->safemode
)
3825 if (list_empty(&mddev
->disks
) &&
3826 mddev
->raid_disks
== 0 &&
3827 mddev
->dev_sectors
== 0)
3832 return sprintf(page
, "%s\n", array_states
[st
]);
3835 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3836 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3837 static int do_md_run(struct mddev
* mddev
);
3838 static int restart_array(struct mddev
*mddev
);
3841 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3844 enum array_state st
= match_word(buf
, array_states
);
3849 /* stopping an active array */
3850 err
= do_md_stop(mddev
, 0, NULL
);
3853 /* stopping an active array */
3855 err
= do_md_stop(mddev
, 2, NULL
);
3857 err
= 0; /* already inactive */
3860 break; /* not supported yet */
3863 err
= md_set_readonly(mddev
, NULL
);
3866 set_disk_ro(mddev
->gendisk
, 1);
3867 err
= do_md_run(mddev
);
3873 err
= md_set_readonly(mddev
, NULL
);
3874 else if (mddev
->ro
== 1)
3875 err
= restart_array(mddev
);
3878 set_disk_ro(mddev
->gendisk
, 0);
3882 err
= do_md_run(mddev
);
3887 restart_array(mddev
);
3888 spin_lock_irq(&mddev
->write_lock
);
3889 if (atomic_read(&mddev
->writes_pending
) == 0) {
3890 if (mddev
->in_sync
== 0) {
3892 if (mddev
->safemode
== 1)
3893 mddev
->safemode
= 0;
3894 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3899 spin_unlock_irq(&mddev
->write_lock
);
3905 restart_array(mddev
);
3906 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3907 wake_up(&mddev
->sb_wait
);
3911 set_disk_ro(mddev
->gendisk
, 0);
3912 err
= do_md_run(mddev
);
3917 /* these cannot be set */
3923 if (mddev
->hold_active
== UNTIL_IOCTL
)
3924 mddev
->hold_active
= 0;
3925 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3929 static struct md_sysfs_entry md_array_state
=
3930 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3933 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3934 return sprintf(page
, "%d\n",
3935 atomic_read(&mddev
->max_corr_read_errors
));
3939 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3942 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3944 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3945 atomic_set(&mddev
->max_corr_read_errors
, n
);
3951 static struct md_sysfs_entry max_corr_read_errors
=
3952 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3953 max_corrected_read_errors_store
);
3956 null_show(struct mddev
*mddev
, char *page
)
3962 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3964 /* buf must be %d:%d\n? giving major and minor numbers */
3965 /* The new device is added to the array.
3966 * If the array has a persistent superblock, we read the
3967 * superblock to initialise info and check validity.
3968 * Otherwise, only checking done is that in bind_rdev_to_array,
3969 * which mainly checks size.
3972 int major
= simple_strtoul(buf
, &e
, 10);
3975 struct md_rdev
*rdev
;
3978 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3980 minor
= simple_strtoul(e
+1, &e
, 10);
3981 if (*e
&& *e
!= '\n')
3983 dev
= MKDEV(major
, minor
);
3984 if (major
!= MAJOR(dev
) ||
3985 minor
!= MINOR(dev
))
3989 if (mddev
->persistent
) {
3990 rdev
= md_import_device(dev
, mddev
->major_version
,
3991 mddev
->minor_version
);
3992 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3993 struct md_rdev
*rdev0
3994 = list_entry(mddev
->disks
.next
,
3995 struct md_rdev
, same_set
);
3996 err
= super_types
[mddev
->major_version
]
3997 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4001 } else if (mddev
->external
)
4002 rdev
= md_import_device(dev
, -2, -1);
4004 rdev
= md_import_device(dev
, -1, -1);
4007 return PTR_ERR(rdev
);
4008 err
= bind_rdev_to_array(rdev
, mddev
);
4012 return err
? err
: len
;
4015 static struct md_sysfs_entry md_new_device
=
4016 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4019 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4022 unsigned long chunk
, end_chunk
;
4026 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4028 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4029 if (buf
== end
) break;
4030 if (*end
== '-') { /* range */
4032 end_chunk
= simple_strtoul(buf
, &end
, 0);
4033 if (buf
== end
) break;
4035 if (*end
&& !isspace(*end
)) break;
4036 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4037 buf
= skip_spaces(end
);
4039 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4044 static struct md_sysfs_entry md_bitmap
=
4045 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4048 size_show(struct mddev
*mddev
, char *page
)
4050 return sprintf(page
, "%llu\n",
4051 (unsigned long long)mddev
->dev_sectors
/ 2);
4054 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4057 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4059 /* If array is inactive, we can reduce the component size, but
4060 * not increase it (except from 0).
4061 * If array is active, we can try an on-line resize
4064 int err
= strict_blocks_to_sectors(buf
, §ors
);
4069 err
= update_size(mddev
, sectors
);
4070 md_update_sb(mddev
, 1);
4072 if (mddev
->dev_sectors
== 0 ||
4073 mddev
->dev_sectors
> sectors
)
4074 mddev
->dev_sectors
= sectors
;
4078 return err
? err
: len
;
4081 static struct md_sysfs_entry md_size
=
4082 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4085 /* Metadata version.
4087 * 'none' for arrays with no metadata (good luck...)
4088 * 'external' for arrays with externally managed metadata,
4089 * or N.M for internally known formats
4092 metadata_show(struct mddev
*mddev
, char *page
)
4094 if (mddev
->persistent
)
4095 return sprintf(page
, "%d.%d\n",
4096 mddev
->major_version
, mddev
->minor_version
);
4097 else if (mddev
->external
)
4098 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4100 return sprintf(page
, "none\n");
4104 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4108 /* Changing the details of 'external' metadata is
4109 * always permitted. Otherwise there must be
4110 * no devices attached to the array.
4112 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4114 else if (!list_empty(&mddev
->disks
))
4117 if (cmd_match(buf
, "none")) {
4118 mddev
->persistent
= 0;
4119 mddev
->external
= 0;
4120 mddev
->major_version
= 0;
4121 mddev
->minor_version
= 90;
4124 if (strncmp(buf
, "external:", 9) == 0) {
4125 size_t namelen
= len
-9;
4126 if (namelen
>= sizeof(mddev
->metadata_type
))
4127 namelen
= sizeof(mddev
->metadata_type
)-1;
4128 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4129 mddev
->metadata_type
[namelen
] = 0;
4130 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4131 mddev
->metadata_type
[--namelen
] = 0;
4132 mddev
->persistent
= 0;
4133 mddev
->external
= 1;
4134 mddev
->major_version
= 0;
4135 mddev
->minor_version
= 90;
4138 major
= simple_strtoul(buf
, &e
, 10);
4139 if (e
==buf
|| *e
!= '.')
4142 minor
= simple_strtoul(buf
, &e
, 10);
4143 if (e
==buf
|| (*e
&& *e
!= '\n') )
4145 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4147 mddev
->major_version
= major
;
4148 mddev
->minor_version
= minor
;
4149 mddev
->persistent
= 1;
4150 mddev
->external
= 0;
4154 static struct md_sysfs_entry md_metadata
=
4155 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4158 action_show(struct mddev
*mddev
, char *page
)
4160 char *type
= "idle";
4161 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4163 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4164 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4165 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4167 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4168 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4170 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4174 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4177 return sprintf(page
, "%s\n", type
);
4181 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4183 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4186 if (cmd_match(page
, "frozen"))
4187 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4189 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4191 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4192 if (mddev
->sync_thread
) {
4193 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4194 md_reap_sync_thread(mddev
);
4196 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4197 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4199 else if (cmd_match(page
, "resync"))
4200 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4201 else if (cmd_match(page
, "recover")) {
4202 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4203 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4204 } else if (cmd_match(page
, "reshape")) {
4206 if (mddev
->pers
->start_reshape
== NULL
)
4208 err
= mddev
->pers
->start_reshape(mddev
);
4211 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4213 if (cmd_match(page
, "check"))
4214 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4215 else if (!cmd_match(page
, "repair"))
4217 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4218 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4220 if (mddev
->ro
== 2) {
4221 /* A write to sync_action is enough to justify
4222 * canceling read-auto mode
4225 md_wakeup_thread(mddev
->sync_thread
);
4227 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4228 md_wakeup_thread(mddev
->thread
);
4229 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4233 static struct md_sysfs_entry md_scan_mode
=
4234 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4237 last_sync_action_show(struct mddev
*mddev
, char *page
)
4239 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4242 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4245 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4247 return sprintf(page
, "%llu\n",
4248 (unsigned long long)
4249 atomic64_read(&mddev
->resync_mismatches
));
4252 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4255 sync_min_show(struct mddev
*mddev
, char *page
)
4257 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4258 mddev
->sync_speed_min
? "local": "system");
4262 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4266 if (strncmp(buf
, "system", 6)==0) {
4267 mddev
->sync_speed_min
= 0;
4270 min
= simple_strtoul(buf
, &e
, 10);
4271 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4273 mddev
->sync_speed_min
= min
;
4277 static struct md_sysfs_entry md_sync_min
=
4278 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4281 sync_max_show(struct mddev
*mddev
, char *page
)
4283 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4284 mddev
->sync_speed_max
? "local": "system");
4288 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4292 if (strncmp(buf
, "system", 6)==0) {
4293 mddev
->sync_speed_max
= 0;
4296 max
= simple_strtoul(buf
, &e
, 10);
4297 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4299 mddev
->sync_speed_max
= max
;
4303 static struct md_sysfs_entry md_sync_max
=
4304 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4307 degraded_show(struct mddev
*mddev
, char *page
)
4309 return sprintf(page
, "%d\n", mddev
->degraded
);
4311 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4314 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4316 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4320 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4324 if (kstrtol(buf
, 10, &n
))
4327 if (n
!= 0 && n
!= 1)
4330 mddev
->parallel_resync
= n
;
4332 if (mddev
->sync_thread
)
4333 wake_up(&resync_wait
);
4338 /* force parallel resync, even with shared block devices */
4339 static struct md_sysfs_entry md_sync_force_parallel
=
4340 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4341 sync_force_parallel_show
, sync_force_parallel_store
);
4344 sync_speed_show(struct mddev
*mddev
, char *page
)
4346 unsigned long resync
, dt
, db
;
4347 if (mddev
->curr_resync
== 0)
4348 return sprintf(page
, "none\n");
4349 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4350 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4352 db
= resync
- mddev
->resync_mark_cnt
;
4353 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4356 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4359 sync_completed_show(struct mddev
*mddev
, char *page
)
4361 unsigned long long max_sectors
, resync
;
4363 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4364 return sprintf(page
, "none\n");
4366 if (mddev
->curr_resync
== 1 ||
4367 mddev
->curr_resync
== 2)
4368 return sprintf(page
, "delayed\n");
4370 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4371 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4372 max_sectors
= mddev
->resync_max_sectors
;
4374 max_sectors
= mddev
->dev_sectors
;
4376 resync
= mddev
->curr_resync_completed
;
4377 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4380 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4383 min_sync_show(struct mddev
*mddev
, char *page
)
4385 return sprintf(page
, "%llu\n",
4386 (unsigned long long)mddev
->resync_min
);
4389 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4391 unsigned long long min
;
4392 if (kstrtoull(buf
, 10, &min
))
4394 if (min
> mddev
->resync_max
)
4396 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4399 /* Must be a multiple of chunk_size */
4400 if (mddev
->chunk_sectors
) {
4401 sector_t temp
= min
;
4402 if (sector_div(temp
, mddev
->chunk_sectors
))
4405 mddev
->resync_min
= min
;
4410 static struct md_sysfs_entry md_min_sync
=
4411 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4414 max_sync_show(struct mddev
*mddev
, char *page
)
4416 if (mddev
->resync_max
== MaxSector
)
4417 return sprintf(page
, "max\n");
4419 return sprintf(page
, "%llu\n",
4420 (unsigned long long)mddev
->resync_max
);
4423 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4425 if (strncmp(buf
, "max", 3) == 0)
4426 mddev
->resync_max
= MaxSector
;
4428 unsigned long long max
;
4429 if (kstrtoull(buf
, 10, &max
))
4431 if (max
< mddev
->resync_min
)
4433 if (max
< mddev
->resync_max
&&
4435 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4438 /* Must be a multiple of chunk_size */
4439 if (mddev
->chunk_sectors
) {
4440 sector_t temp
= max
;
4441 if (sector_div(temp
, mddev
->chunk_sectors
))
4444 mddev
->resync_max
= max
;
4446 wake_up(&mddev
->recovery_wait
);
4450 static struct md_sysfs_entry md_max_sync
=
4451 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4454 suspend_lo_show(struct mddev
*mddev
, char *page
)
4456 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4460 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4463 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4464 unsigned long long old
= mddev
->suspend_lo
;
4466 if (mddev
->pers
== NULL
||
4467 mddev
->pers
->quiesce
== NULL
)
4469 if (buf
== e
|| (*e
&& *e
!= '\n'))
4472 mddev
->suspend_lo
= new;
4474 /* Shrinking suspended region */
4475 mddev
->pers
->quiesce(mddev
, 2);
4477 /* Expanding suspended region - need to wait */
4478 mddev
->pers
->quiesce(mddev
, 1);
4479 mddev
->pers
->quiesce(mddev
, 0);
4483 static struct md_sysfs_entry md_suspend_lo
=
4484 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4488 suspend_hi_show(struct mddev
*mddev
, char *page
)
4490 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4494 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4497 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4498 unsigned long long old
= mddev
->suspend_hi
;
4500 if (mddev
->pers
== NULL
||
4501 mddev
->pers
->quiesce
== NULL
)
4503 if (buf
== e
|| (*e
&& *e
!= '\n'))
4506 mddev
->suspend_hi
= new;
4508 /* Shrinking suspended region */
4509 mddev
->pers
->quiesce(mddev
, 2);
4511 /* Expanding suspended region - need to wait */
4512 mddev
->pers
->quiesce(mddev
, 1);
4513 mddev
->pers
->quiesce(mddev
, 0);
4517 static struct md_sysfs_entry md_suspend_hi
=
4518 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4521 reshape_position_show(struct mddev
*mddev
, char *page
)
4523 if (mddev
->reshape_position
!= MaxSector
)
4524 return sprintf(page
, "%llu\n",
4525 (unsigned long long)mddev
->reshape_position
);
4526 strcpy(page
, "none\n");
4531 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4533 struct md_rdev
*rdev
;
4535 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4538 if (buf
== e
|| (*e
&& *e
!= '\n'))
4540 mddev
->reshape_position
= new;
4541 mddev
->delta_disks
= 0;
4542 mddev
->reshape_backwards
= 0;
4543 mddev
->new_level
= mddev
->level
;
4544 mddev
->new_layout
= mddev
->layout
;
4545 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4546 rdev_for_each(rdev
, mddev
)
4547 rdev
->new_data_offset
= rdev
->data_offset
;
4551 static struct md_sysfs_entry md_reshape_position
=
4552 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4553 reshape_position_store
);
4556 reshape_direction_show(struct mddev
*mddev
, char *page
)
4558 return sprintf(page
, "%s\n",
4559 mddev
->reshape_backwards
? "backwards" : "forwards");
4563 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4566 if (cmd_match(buf
, "forwards"))
4568 else if (cmd_match(buf
, "backwards"))
4572 if (mddev
->reshape_backwards
== backwards
)
4575 /* check if we are allowed to change */
4576 if (mddev
->delta_disks
)
4579 if (mddev
->persistent
&&
4580 mddev
->major_version
== 0)
4583 mddev
->reshape_backwards
= backwards
;
4587 static struct md_sysfs_entry md_reshape_direction
=
4588 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4589 reshape_direction_store
);
4592 array_size_show(struct mddev
*mddev
, char *page
)
4594 if (mddev
->external_size
)
4595 return sprintf(page
, "%llu\n",
4596 (unsigned long long)mddev
->array_sectors
/2);
4598 return sprintf(page
, "default\n");
4602 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4606 if (strncmp(buf
, "default", 7) == 0) {
4608 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4610 sectors
= mddev
->array_sectors
;
4612 mddev
->external_size
= 0;
4614 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4616 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4619 mddev
->external_size
= 1;
4622 mddev
->array_sectors
= sectors
;
4624 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4625 revalidate_disk(mddev
->gendisk
);
4630 static struct md_sysfs_entry md_array_size
=
4631 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4634 static struct attribute
*md_default_attrs
[] = {
4637 &md_raid_disks
.attr
,
4638 &md_chunk_size
.attr
,
4640 &md_resync_start
.attr
,
4642 &md_new_device
.attr
,
4643 &md_safe_delay
.attr
,
4644 &md_array_state
.attr
,
4645 &md_reshape_position
.attr
,
4646 &md_reshape_direction
.attr
,
4647 &md_array_size
.attr
,
4648 &max_corr_read_errors
.attr
,
4652 static struct attribute
*md_redundancy_attrs
[] = {
4654 &md_last_scan_mode
.attr
,
4655 &md_mismatches
.attr
,
4658 &md_sync_speed
.attr
,
4659 &md_sync_force_parallel
.attr
,
4660 &md_sync_completed
.attr
,
4663 &md_suspend_lo
.attr
,
4664 &md_suspend_hi
.attr
,
4669 static struct attribute_group md_redundancy_group
= {
4671 .attrs
= md_redundancy_attrs
,
4676 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4678 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4679 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4684 spin_lock(&all_mddevs_lock
);
4685 if (list_empty(&mddev
->all_mddevs
)) {
4686 spin_unlock(&all_mddevs_lock
);
4690 spin_unlock(&all_mddevs_lock
);
4692 rv
= mddev_lock(mddev
);
4694 rv
= entry
->show(mddev
, page
);
4695 mddev_unlock(mddev
);
4702 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4703 const char *page
, size_t length
)
4705 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4706 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4711 if (!capable(CAP_SYS_ADMIN
))
4713 spin_lock(&all_mddevs_lock
);
4714 if (list_empty(&mddev
->all_mddevs
)) {
4715 spin_unlock(&all_mddevs_lock
);
4719 spin_unlock(&all_mddevs_lock
);
4720 if (entry
->store
== new_dev_store
)
4721 flush_workqueue(md_misc_wq
);
4722 rv
= mddev_lock(mddev
);
4724 rv
= entry
->store(mddev
, page
, length
);
4725 mddev_unlock(mddev
);
4731 static void md_free(struct kobject
*ko
)
4733 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4735 if (mddev
->sysfs_state
)
4736 sysfs_put(mddev
->sysfs_state
);
4738 if (mddev
->gendisk
) {
4739 del_gendisk(mddev
->gendisk
);
4740 put_disk(mddev
->gendisk
);
4743 blk_cleanup_queue(mddev
->queue
);
4748 static const struct sysfs_ops md_sysfs_ops
= {
4749 .show
= md_attr_show
,
4750 .store
= md_attr_store
,
4752 static struct kobj_type md_ktype
= {
4754 .sysfs_ops
= &md_sysfs_ops
,
4755 .default_attrs
= md_default_attrs
,
4760 static void mddev_delayed_delete(struct work_struct
*ws
)
4762 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4764 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4765 kobject_del(&mddev
->kobj
);
4766 kobject_put(&mddev
->kobj
);
4769 static int md_alloc(dev_t dev
, char *name
)
4771 static DEFINE_MUTEX(disks_mutex
);
4772 struct mddev
*mddev
= mddev_find(dev
);
4773 struct gendisk
*disk
;
4782 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4783 shift
= partitioned
? MdpMinorShift
: 0;
4784 unit
= MINOR(mddev
->unit
) >> shift
;
4786 /* wait for any previous instance of this device to be
4787 * completely removed (mddev_delayed_delete).
4789 flush_workqueue(md_misc_wq
);
4791 mutex_lock(&disks_mutex
);
4797 /* Need to ensure that 'name' is not a duplicate.
4799 struct mddev
*mddev2
;
4800 spin_lock(&all_mddevs_lock
);
4802 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4803 if (mddev2
->gendisk
&&
4804 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4805 spin_unlock(&all_mddevs_lock
);
4808 spin_unlock(&all_mddevs_lock
);
4812 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4815 mddev
->queue
->queuedata
= mddev
;
4817 blk_queue_make_request(mddev
->queue
, md_make_request
);
4818 blk_set_stacking_limits(&mddev
->queue
->limits
);
4820 disk
= alloc_disk(1 << shift
);
4822 blk_cleanup_queue(mddev
->queue
);
4823 mddev
->queue
= NULL
;
4826 disk
->major
= MAJOR(mddev
->unit
);
4827 disk
->first_minor
= unit
<< shift
;
4829 strcpy(disk
->disk_name
, name
);
4830 else if (partitioned
)
4831 sprintf(disk
->disk_name
, "md_d%d", unit
);
4833 sprintf(disk
->disk_name
, "md%d", unit
);
4834 disk
->fops
= &md_fops
;
4835 disk
->private_data
= mddev
;
4836 disk
->queue
= mddev
->queue
;
4837 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4838 /* Allow extended partitions. This makes the
4839 * 'mdp' device redundant, but we can't really
4842 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4843 mddev
->gendisk
= disk
;
4844 /* As soon as we call add_disk(), another thread could get
4845 * through to md_open, so make sure it doesn't get too far
4847 mutex_lock(&mddev
->open_mutex
);
4850 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4851 &disk_to_dev(disk
)->kobj
, "%s", "md");
4853 /* This isn't possible, but as kobject_init_and_add is marked
4854 * __must_check, we must do something with the result
4856 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4860 if (mddev
->kobj
.sd
&&
4861 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4862 printk(KERN_DEBUG
"pointless warning\n");
4863 mutex_unlock(&mddev
->open_mutex
);
4865 mutex_unlock(&disks_mutex
);
4866 if (!error
&& mddev
->kobj
.sd
) {
4867 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4868 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4874 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4876 md_alloc(dev
, NULL
);
4880 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4882 /* val must be "md_*" where * is not all digits.
4883 * We allocate an array with a large free minor number, and
4884 * set the name to val. val must not already be an active name.
4886 int len
= strlen(val
);
4887 char buf
[DISK_NAME_LEN
];
4889 while (len
&& val
[len
-1] == '\n')
4891 if (len
>= DISK_NAME_LEN
)
4893 strlcpy(buf
, val
, len
+1);
4894 if (strncmp(buf
, "md_", 3) != 0)
4896 return md_alloc(0, buf
);
4899 static void md_safemode_timeout(unsigned long data
)
4901 struct mddev
*mddev
= (struct mddev
*) data
;
4903 if (!atomic_read(&mddev
->writes_pending
)) {
4904 mddev
->safemode
= 1;
4905 if (mddev
->external
)
4906 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4908 md_wakeup_thread(mddev
->thread
);
4911 static int start_dirty_degraded
;
4913 int md_run(struct mddev
*mddev
)
4916 struct md_rdev
*rdev
;
4917 struct md_personality
*pers
;
4919 if (list_empty(&mddev
->disks
))
4920 /* cannot run an array with no devices.. */
4925 /* Cannot run until previous stop completes properly */
4926 if (mddev
->sysfs_active
)
4930 * Analyze all RAID superblock(s)
4932 if (!mddev
->raid_disks
) {
4933 if (!mddev
->persistent
)
4938 if (mddev
->level
!= LEVEL_NONE
)
4939 request_module("md-level-%d", mddev
->level
);
4940 else if (mddev
->clevel
[0])
4941 request_module("md-%s", mddev
->clevel
);
4944 * Drop all container device buffers, from now on
4945 * the only valid external interface is through the md
4948 rdev_for_each(rdev
, mddev
) {
4949 if (test_bit(Faulty
, &rdev
->flags
))
4951 sync_blockdev(rdev
->bdev
);
4952 invalidate_bdev(rdev
->bdev
);
4954 /* perform some consistency tests on the device.
4955 * We don't want the data to overlap the metadata,
4956 * Internal Bitmap issues have been handled elsewhere.
4958 if (rdev
->meta_bdev
) {
4959 /* Nothing to check */;
4960 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4961 if (mddev
->dev_sectors
&&
4962 rdev
->data_offset
+ mddev
->dev_sectors
4964 printk("md: %s: data overlaps metadata\n",
4969 if (rdev
->sb_start
+ rdev
->sb_size
/512
4970 > rdev
->data_offset
) {
4971 printk("md: %s: metadata overlaps data\n",
4976 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4979 if (mddev
->bio_set
== NULL
)
4980 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
4982 spin_lock(&pers_lock
);
4983 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4984 if (!pers
|| !try_module_get(pers
->owner
)) {
4985 spin_unlock(&pers_lock
);
4986 if (mddev
->level
!= LEVEL_NONE
)
4987 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4990 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4995 spin_unlock(&pers_lock
);
4996 if (mddev
->level
!= pers
->level
) {
4997 mddev
->level
= pers
->level
;
4998 mddev
->new_level
= pers
->level
;
5000 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5002 if (mddev
->reshape_position
!= MaxSector
&&
5003 pers
->start_reshape
== NULL
) {
5004 /* This personality cannot handle reshaping... */
5006 module_put(pers
->owner
);
5010 if (pers
->sync_request
) {
5011 /* Warn if this is a potentially silly
5014 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5015 struct md_rdev
*rdev2
;
5018 rdev_for_each(rdev
, mddev
)
5019 rdev_for_each(rdev2
, mddev
) {
5021 rdev
->bdev
->bd_contains
==
5022 rdev2
->bdev
->bd_contains
) {
5024 "%s: WARNING: %s appears to be"
5025 " on the same physical disk as"
5028 bdevname(rdev
->bdev
,b
),
5029 bdevname(rdev2
->bdev
,b2
));
5036 "True protection against single-disk"
5037 " failure might be compromised.\n");
5040 mddev
->recovery
= 0;
5041 /* may be over-ridden by personality */
5042 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5044 mddev
->ok_start_degraded
= start_dirty_degraded
;
5046 if (start_readonly
&& mddev
->ro
== 0)
5047 mddev
->ro
= 2; /* read-only, but switch on first write */
5049 err
= mddev
->pers
->run(mddev
);
5051 printk(KERN_ERR
"md: pers->run() failed ...\n");
5052 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5053 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5054 " but 'external_size' not in effect?\n", __func__
);
5056 "md: invalid array_size %llu > default size %llu\n",
5057 (unsigned long long)mddev
->array_sectors
/ 2,
5058 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5060 mddev
->pers
->stop(mddev
);
5062 if (err
== 0 && mddev
->pers
->sync_request
&&
5063 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5064 err
= bitmap_create(mddev
);
5066 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5067 mdname(mddev
), err
);
5068 mddev
->pers
->stop(mddev
);
5072 module_put(mddev
->pers
->owner
);
5074 bitmap_destroy(mddev
);
5077 if (mddev
->pers
->sync_request
) {
5078 if (mddev
->kobj
.sd
&&
5079 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5081 "md: cannot register extra attributes for %s\n",
5083 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5084 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5087 atomic_set(&mddev
->writes_pending
,0);
5088 atomic_set(&mddev
->max_corr_read_errors
,
5089 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5090 mddev
->safemode
= 0;
5091 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5092 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5093 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5097 rdev_for_each(rdev
, mddev
)
5098 if (rdev
->raid_disk
>= 0)
5099 if (sysfs_link_rdev(mddev
, rdev
))
5100 /* failure here is OK */;
5102 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5104 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5105 md_update_sb(mddev
, 0);
5107 md_new_event(mddev
);
5108 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5109 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5110 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5113 EXPORT_SYMBOL_GPL(md_run
);
5115 static int do_md_run(struct mddev
*mddev
)
5119 err
= md_run(mddev
);
5122 err
= bitmap_load(mddev
);
5124 bitmap_destroy(mddev
);
5128 md_wakeup_thread(mddev
->thread
);
5129 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5131 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5132 revalidate_disk(mddev
->gendisk
);
5134 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5139 static int restart_array(struct mddev
*mddev
)
5141 struct gendisk
*disk
= mddev
->gendisk
;
5143 /* Complain if it has no devices */
5144 if (list_empty(&mddev
->disks
))
5150 mddev
->safemode
= 0;
5152 set_disk_ro(disk
, 0);
5153 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5155 /* Kick recovery or resync if necessary */
5156 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5157 md_wakeup_thread(mddev
->thread
);
5158 md_wakeup_thread(mddev
->sync_thread
);
5159 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5163 /* similar to deny_write_access, but accounts for our holding a reference
5164 * to the file ourselves */
5165 static int deny_bitmap_write_access(struct file
* file
)
5167 struct inode
*inode
= file
->f_mapping
->host
;
5169 spin_lock(&inode
->i_lock
);
5170 if (atomic_read(&inode
->i_writecount
) > 1) {
5171 spin_unlock(&inode
->i_lock
);
5174 atomic_set(&inode
->i_writecount
, -1);
5175 spin_unlock(&inode
->i_lock
);
5180 void restore_bitmap_write_access(struct file
*file
)
5182 struct inode
*inode
= file
->f_mapping
->host
;
5184 spin_lock(&inode
->i_lock
);
5185 atomic_set(&inode
->i_writecount
, 1);
5186 spin_unlock(&inode
->i_lock
);
5189 static void md_clean(struct mddev
*mddev
)
5191 mddev
->array_sectors
= 0;
5192 mddev
->external_size
= 0;
5193 mddev
->dev_sectors
= 0;
5194 mddev
->raid_disks
= 0;
5195 mddev
->recovery_cp
= 0;
5196 mddev
->resync_min
= 0;
5197 mddev
->resync_max
= MaxSector
;
5198 mddev
->reshape_position
= MaxSector
;
5199 mddev
->external
= 0;
5200 mddev
->persistent
= 0;
5201 mddev
->level
= LEVEL_NONE
;
5202 mddev
->clevel
[0] = 0;
5205 mddev
->metadata_type
[0] = 0;
5206 mddev
->chunk_sectors
= 0;
5207 mddev
->ctime
= mddev
->utime
= 0;
5209 mddev
->max_disks
= 0;
5211 mddev
->can_decrease_events
= 0;
5212 mddev
->delta_disks
= 0;
5213 mddev
->reshape_backwards
= 0;
5214 mddev
->new_level
= LEVEL_NONE
;
5215 mddev
->new_layout
= 0;
5216 mddev
->new_chunk_sectors
= 0;
5217 mddev
->curr_resync
= 0;
5218 atomic64_set(&mddev
->resync_mismatches
, 0);
5219 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5220 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5221 mddev
->recovery
= 0;
5224 mddev
->degraded
= 0;
5225 mddev
->safemode
= 0;
5226 mddev
->merge_check_needed
= 0;
5227 mddev
->bitmap_info
.offset
= 0;
5228 mddev
->bitmap_info
.default_offset
= 0;
5229 mddev
->bitmap_info
.default_space
= 0;
5230 mddev
->bitmap_info
.chunksize
= 0;
5231 mddev
->bitmap_info
.daemon_sleep
= 0;
5232 mddev
->bitmap_info
.max_write_behind
= 0;
5235 static void __md_stop_writes(struct mddev
*mddev
)
5237 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5238 if (mddev
->sync_thread
) {
5239 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5240 md_reap_sync_thread(mddev
);
5243 del_timer_sync(&mddev
->safemode_timer
);
5245 bitmap_flush(mddev
);
5246 md_super_wait(mddev
);
5248 if (mddev
->ro
== 0 &&
5249 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5250 /* mark array as shutdown cleanly */
5252 md_update_sb(mddev
, 1);
5256 void md_stop_writes(struct mddev
*mddev
)
5258 mddev_lock_nointr(mddev
);
5259 __md_stop_writes(mddev
);
5260 mddev_unlock(mddev
);
5262 EXPORT_SYMBOL_GPL(md_stop_writes
);
5264 static void __md_stop(struct mddev
*mddev
)
5267 mddev
->pers
->stop(mddev
);
5268 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5269 mddev
->to_remove
= &md_redundancy_group
;
5270 module_put(mddev
->pers
->owner
);
5272 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5275 void md_stop(struct mddev
*mddev
)
5277 /* stop the array and free an attached data structures.
5278 * This is called from dm-raid
5281 bitmap_destroy(mddev
);
5283 bioset_free(mddev
->bio_set
);
5286 EXPORT_SYMBOL_GPL(md_stop
);
5288 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5293 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5295 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5296 md_wakeup_thread(mddev
->thread
);
5298 if (mddev
->sync_thread
) {
5299 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5300 /* Thread might be blocked waiting for metadata update
5301 * which will now never happen */
5302 wake_up_process(mddev
->sync_thread
->tsk
);
5304 mddev_unlock(mddev
);
5305 wait_event(resync_wait
, mddev
->sync_thread
== NULL
);
5306 mddev_lock_nointr(mddev
);
5308 mutex_lock(&mddev
->open_mutex
);
5309 if (atomic_read(&mddev
->openers
) > !!bdev
||
5310 mddev
->sync_thread
||
5311 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5312 printk("md: %s still in use.\n",mdname(mddev
));
5314 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5315 md_wakeup_thread(mddev
->thread
);
5321 __md_stop_writes(mddev
);
5327 set_disk_ro(mddev
->gendisk
, 1);
5328 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5329 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5333 mutex_unlock(&mddev
->open_mutex
);
5338 * 0 - completely stop and dis-assemble array
5339 * 2 - stop but do not disassemble array
5341 static int do_md_stop(struct mddev
* mddev
, int mode
,
5342 struct block_device
*bdev
)
5344 struct gendisk
*disk
= mddev
->gendisk
;
5345 struct md_rdev
*rdev
;
5348 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5350 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5351 md_wakeup_thread(mddev
->thread
);
5353 if (mddev
->sync_thread
) {
5354 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5355 /* Thread might be blocked waiting for metadata update
5356 * which will now never happen */
5357 wake_up_process(mddev
->sync_thread
->tsk
);
5359 mddev_unlock(mddev
);
5360 wait_event(resync_wait
, mddev
->sync_thread
== NULL
);
5361 mddev_lock_nointr(mddev
);
5363 mutex_lock(&mddev
->open_mutex
);
5364 if (atomic_read(&mddev
->openers
) > !!bdev
||
5365 mddev
->sysfs_active
||
5366 mddev
->sync_thread
||
5367 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5368 printk("md: %s still in use.\n",mdname(mddev
));
5369 mutex_unlock(&mddev
->open_mutex
);
5371 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5372 md_wakeup_thread(mddev
->thread
);
5378 set_disk_ro(disk
, 0);
5380 __md_stop_writes(mddev
);
5382 mddev
->queue
->merge_bvec_fn
= NULL
;
5383 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5385 /* tell userspace to handle 'inactive' */
5386 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5388 rdev_for_each(rdev
, mddev
)
5389 if (rdev
->raid_disk
>= 0)
5390 sysfs_unlink_rdev(mddev
, rdev
);
5392 set_capacity(disk
, 0);
5393 mutex_unlock(&mddev
->open_mutex
);
5395 revalidate_disk(disk
);
5400 mutex_unlock(&mddev
->open_mutex
);
5402 * Free resources if final stop
5405 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5407 bitmap_destroy(mddev
);
5408 if (mddev
->bitmap_info
.file
) {
5409 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5410 fput(mddev
->bitmap_info
.file
);
5411 mddev
->bitmap_info
.file
= NULL
;
5413 mddev
->bitmap_info
.offset
= 0;
5415 export_array(mddev
);
5418 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5419 if (mddev
->hold_active
== UNTIL_STOP
)
5420 mddev
->hold_active
= 0;
5422 blk_integrity_unregister(disk
);
5423 md_new_event(mddev
);
5424 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5429 static void autorun_array(struct mddev
*mddev
)
5431 struct md_rdev
*rdev
;
5434 if (list_empty(&mddev
->disks
))
5437 printk(KERN_INFO
"md: running: ");
5439 rdev_for_each(rdev
, mddev
) {
5440 char b
[BDEVNAME_SIZE
];
5441 printk("<%s>", bdevname(rdev
->bdev
,b
));
5445 err
= do_md_run(mddev
);
5447 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5448 do_md_stop(mddev
, 0, NULL
);
5453 * lets try to run arrays based on all disks that have arrived
5454 * until now. (those are in pending_raid_disks)
5456 * the method: pick the first pending disk, collect all disks with
5457 * the same UUID, remove all from the pending list and put them into
5458 * the 'same_array' list. Then order this list based on superblock
5459 * update time (freshest comes first), kick out 'old' disks and
5460 * compare superblocks. If everything's fine then run it.
5462 * If "unit" is allocated, then bump its reference count
5464 static void autorun_devices(int part
)
5466 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5467 struct mddev
*mddev
;
5468 char b
[BDEVNAME_SIZE
];
5470 printk(KERN_INFO
"md: autorun ...\n");
5471 while (!list_empty(&pending_raid_disks
)) {
5474 LIST_HEAD(candidates
);
5475 rdev0
= list_entry(pending_raid_disks
.next
,
5476 struct md_rdev
, same_set
);
5478 printk(KERN_INFO
"md: considering %s ...\n",
5479 bdevname(rdev0
->bdev
,b
));
5480 INIT_LIST_HEAD(&candidates
);
5481 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5482 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5483 printk(KERN_INFO
"md: adding %s ...\n",
5484 bdevname(rdev
->bdev
,b
));
5485 list_move(&rdev
->same_set
, &candidates
);
5488 * now we have a set of devices, with all of them having
5489 * mostly sane superblocks. It's time to allocate the
5493 dev
= MKDEV(mdp_major
,
5494 rdev0
->preferred_minor
<< MdpMinorShift
);
5495 unit
= MINOR(dev
) >> MdpMinorShift
;
5497 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5500 if (rdev0
->preferred_minor
!= unit
) {
5501 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5502 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5506 md_probe(dev
, NULL
, NULL
);
5507 mddev
= mddev_find(dev
);
5508 if (!mddev
|| !mddev
->gendisk
) {
5512 "md: cannot allocate memory for md drive.\n");
5515 if (mddev_lock(mddev
))
5516 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5518 else if (mddev
->raid_disks
|| mddev
->major_version
5519 || !list_empty(&mddev
->disks
)) {
5521 "md: %s already running, cannot run %s\n",
5522 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5523 mddev_unlock(mddev
);
5525 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5526 mddev
->persistent
= 1;
5527 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5528 list_del_init(&rdev
->same_set
);
5529 if (bind_rdev_to_array(rdev
, mddev
))
5532 autorun_array(mddev
);
5533 mddev_unlock(mddev
);
5535 /* on success, candidates will be empty, on error
5538 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5539 list_del_init(&rdev
->same_set
);
5544 printk(KERN_INFO
"md: ... autorun DONE.\n");
5546 #endif /* !MODULE */
5548 static int get_version(void __user
* arg
)
5552 ver
.major
= MD_MAJOR_VERSION
;
5553 ver
.minor
= MD_MINOR_VERSION
;
5554 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5556 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5562 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5564 mdu_array_info_t info
;
5565 int nr
,working
,insync
,failed
,spare
;
5566 struct md_rdev
*rdev
;
5568 nr
= working
= insync
= failed
= spare
= 0;
5570 rdev_for_each_rcu(rdev
, mddev
) {
5572 if (test_bit(Faulty
, &rdev
->flags
))
5576 if (test_bit(In_sync
, &rdev
->flags
))
5584 info
.major_version
= mddev
->major_version
;
5585 info
.minor_version
= mddev
->minor_version
;
5586 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5587 info
.ctime
= mddev
->ctime
;
5588 info
.level
= mddev
->level
;
5589 info
.size
= mddev
->dev_sectors
/ 2;
5590 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5593 info
.raid_disks
= mddev
->raid_disks
;
5594 info
.md_minor
= mddev
->md_minor
;
5595 info
.not_persistent
= !mddev
->persistent
;
5597 info
.utime
= mddev
->utime
;
5600 info
.state
= (1<<MD_SB_CLEAN
);
5601 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5602 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5603 info
.active_disks
= insync
;
5604 info
.working_disks
= working
;
5605 info
.failed_disks
= failed
;
5606 info
.spare_disks
= spare
;
5608 info
.layout
= mddev
->layout
;
5609 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5611 if (copy_to_user(arg
, &info
, sizeof(info
)))
5617 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5619 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5620 char *ptr
, *buf
= NULL
;
5623 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5628 /* bitmap disabled, zero the first byte and copy out */
5629 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5630 file
->pathname
[0] = '\0';
5634 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5638 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5639 buf
, sizeof(file
->pathname
));
5643 strcpy(file
->pathname
, ptr
);
5647 if (copy_to_user(arg
, file
, sizeof(*file
)))
5655 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5657 mdu_disk_info_t info
;
5658 struct md_rdev
*rdev
;
5660 if (copy_from_user(&info
, arg
, sizeof(info
)))
5664 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5666 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5667 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5668 info
.raid_disk
= rdev
->raid_disk
;
5670 if (test_bit(Faulty
, &rdev
->flags
))
5671 info
.state
|= (1<<MD_DISK_FAULTY
);
5672 else if (test_bit(In_sync
, &rdev
->flags
)) {
5673 info
.state
|= (1<<MD_DISK_ACTIVE
);
5674 info
.state
|= (1<<MD_DISK_SYNC
);
5676 if (test_bit(WriteMostly
, &rdev
->flags
))
5677 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5679 info
.major
= info
.minor
= 0;
5680 info
.raid_disk
= -1;
5681 info
.state
= (1<<MD_DISK_REMOVED
);
5685 if (copy_to_user(arg
, &info
, sizeof(info
)))
5691 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5693 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5694 struct md_rdev
*rdev
;
5695 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5697 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5700 if (!mddev
->raid_disks
) {
5702 /* expecting a device which has a superblock */
5703 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5706 "md: md_import_device returned %ld\n",
5708 return PTR_ERR(rdev
);
5710 if (!list_empty(&mddev
->disks
)) {
5711 struct md_rdev
*rdev0
5712 = list_entry(mddev
->disks
.next
,
5713 struct md_rdev
, same_set
);
5714 err
= super_types
[mddev
->major_version
]
5715 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5718 "md: %s has different UUID to %s\n",
5719 bdevname(rdev
->bdev
,b
),
5720 bdevname(rdev0
->bdev
,b2
));
5725 err
= bind_rdev_to_array(rdev
, mddev
);
5732 * add_new_disk can be used once the array is assembled
5733 * to add "hot spares". They must already have a superblock
5738 if (!mddev
->pers
->hot_add_disk
) {
5740 "%s: personality does not support diskops!\n",
5744 if (mddev
->persistent
)
5745 rdev
= md_import_device(dev
, mddev
->major_version
,
5746 mddev
->minor_version
);
5748 rdev
= md_import_device(dev
, -1, -1);
5751 "md: md_import_device returned %ld\n",
5753 return PTR_ERR(rdev
);
5755 /* set saved_raid_disk if appropriate */
5756 if (!mddev
->persistent
) {
5757 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5758 info
->raid_disk
< mddev
->raid_disks
) {
5759 rdev
->raid_disk
= info
->raid_disk
;
5760 set_bit(In_sync
, &rdev
->flags
);
5762 rdev
->raid_disk
= -1;
5764 super_types
[mddev
->major_version
].
5765 validate_super(mddev
, rdev
);
5766 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5767 rdev
->raid_disk
!= info
->raid_disk
) {
5768 /* This was a hot-add request, but events doesn't
5769 * match, so reject it.
5775 if (test_bit(In_sync
, &rdev
->flags
))
5776 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5778 rdev
->saved_raid_disk
= -1;
5780 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5781 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5782 set_bit(WriteMostly
, &rdev
->flags
);
5784 clear_bit(WriteMostly
, &rdev
->flags
);
5786 rdev
->raid_disk
= -1;
5787 err
= bind_rdev_to_array(rdev
, mddev
);
5788 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5789 /* If there is hot_add_disk but no hot_remove_disk
5790 * then added disks for geometry changes,
5791 * and should be added immediately.
5793 super_types
[mddev
->major_version
].
5794 validate_super(mddev
, rdev
);
5795 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5797 unbind_rdev_from_array(rdev
);
5802 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5804 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5805 if (mddev
->degraded
)
5806 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5807 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5809 md_new_event(mddev
);
5810 md_wakeup_thread(mddev
->thread
);
5814 /* otherwise, add_new_disk is only allowed
5815 * for major_version==0 superblocks
5817 if (mddev
->major_version
!= 0) {
5818 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5823 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5825 rdev
= md_import_device(dev
, -1, 0);
5828 "md: error, md_import_device() returned %ld\n",
5830 return PTR_ERR(rdev
);
5832 rdev
->desc_nr
= info
->number
;
5833 if (info
->raid_disk
< mddev
->raid_disks
)
5834 rdev
->raid_disk
= info
->raid_disk
;
5836 rdev
->raid_disk
= -1;
5838 if (rdev
->raid_disk
< mddev
->raid_disks
)
5839 if (info
->state
& (1<<MD_DISK_SYNC
))
5840 set_bit(In_sync
, &rdev
->flags
);
5842 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5843 set_bit(WriteMostly
, &rdev
->flags
);
5845 if (!mddev
->persistent
) {
5846 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5847 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5849 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5850 rdev
->sectors
= rdev
->sb_start
;
5852 err
= bind_rdev_to_array(rdev
, mddev
);
5862 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5864 char b
[BDEVNAME_SIZE
];
5865 struct md_rdev
*rdev
;
5867 rdev
= find_rdev(mddev
, dev
);
5871 clear_bit(Blocked
, &rdev
->flags
);
5872 remove_and_add_spares(mddev
, rdev
);
5874 if (rdev
->raid_disk
>= 0)
5877 kick_rdev_from_array(rdev
);
5878 md_update_sb(mddev
, 1);
5879 md_new_event(mddev
);
5883 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5884 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5888 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5890 char b
[BDEVNAME_SIZE
];
5892 struct md_rdev
*rdev
;
5897 if (mddev
->major_version
!= 0) {
5898 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5899 " version-0 superblocks.\n",
5903 if (!mddev
->pers
->hot_add_disk
) {
5905 "%s: personality does not support diskops!\n",
5910 rdev
= md_import_device(dev
, -1, 0);
5913 "md: error, md_import_device() returned %ld\n",
5918 if (mddev
->persistent
)
5919 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5921 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5923 rdev
->sectors
= rdev
->sb_start
;
5925 if (test_bit(Faulty
, &rdev
->flags
)) {
5927 "md: can not hot-add faulty %s disk to %s!\n",
5928 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5932 clear_bit(In_sync
, &rdev
->flags
);
5934 rdev
->saved_raid_disk
= -1;
5935 err
= bind_rdev_to_array(rdev
, mddev
);
5940 * The rest should better be atomic, we can have disk failures
5941 * noticed in interrupt contexts ...
5944 rdev
->raid_disk
= -1;
5946 md_update_sb(mddev
, 1);
5949 * Kick recovery, maybe this spare has to be added to the
5950 * array immediately.
5952 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5953 md_wakeup_thread(mddev
->thread
);
5954 md_new_event(mddev
);
5962 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5967 if (!mddev
->pers
->quiesce
)
5969 if (mddev
->recovery
|| mddev
->sync_thread
)
5971 /* we should be able to change the bitmap.. */
5977 return -EEXIST
; /* cannot add when bitmap is present */
5978 mddev
->bitmap_info
.file
= fget(fd
);
5980 if (mddev
->bitmap_info
.file
== NULL
) {
5981 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5986 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5988 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5990 fput(mddev
->bitmap_info
.file
);
5991 mddev
->bitmap_info
.file
= NULL
;
5994 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5995 } else if (mddev
->bitmap
== NULL
)
5996 return -ENOENT
; /* cannot remove what isn't there */
5999 mddev
->pers
->quiesce(mddev
, 1);
6001 err
= bitmap_create(mddev
);
6003 err
= bitmap_load(mddev
);
6005 if (fd
< 0 || err
) {
6006 bitmap_destroy(mddev
);
6007 fd
= -1; /* make sure to put the file */
6009 mddev
->pers
->quiesce(mddev
, 0);
6012 if (mddev
->bitmap_info
.file
) {
6013 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
6014 fput(mddev
->bitmap_info
.file
);
6016 mddev
->bitmap_info
.file
= NULL
;
6023 * set_array_info is used two different ways
6024 * The original usage is when creating a new array.
6025 * In this usage, raid_disks is > 0 and it together with
6026 * level, size, not_persistent,layout,chunksize determine the
6027 * shape of the array.
6028 * This will always create an array with a type-0.90.0 superblock.
6029 * The newer usage is when assembling an array.
6030 * In this case raid_disks will be 0, and the major_version field is
6031 * use to determine which style super-blocks are to be found on the devices.
6032 * The minor and patch _version numbers are also kept incase the
6033 * super_block handler wishes to interpret them.
6035 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6038 if (info
->raid_disks
== 0) {
6039 /* just setting version number for superblock loading */
6040 if (info
->major_version
< 0 ||
6041 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6042 super_types
[info
->major_version
].name
== NULL
) {
6043 /* maybe try to auto-load a module? */
6045 "md: superblock version %d not known\n",
6046 info
->major_version
);
6049 mddev
->major_version
= info
->major_version
;
6050 mddev
->minor_version
= info
->minor_version
;
6051 mddev
->patch_version
= info
->patch_version
;
6052 mddev
->persistent
= !info
->not_persistent
;
6053 /* ensure mddev_put doesn't delete this now that there
6054 * is some minimal configuration.
6056 mddev
->ctime
= get_seconds();
6059 mddev
->major_version
= MD_MAJOR_VERSION
;
6060 mddev
->minor_version
= MD_MINOR_VERSION
;
6061 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6062 mddev
->ctime
= get_seconds();
6064 mddev
->level
= info
->level
;
6065 mddev
->clevel
[0] = 0;
6066 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6067 mddev
->raid_disks
= info
->raid_disks
;
6068 /* don't set md_minor, it is determined by which /dev/md* was
6071 if (info
->state
& (1<<MD_SB_CLEAN
))
6072 mddev
->recovery_cp
= MaxSector
;
6074 mddev
->recovery_cp
= 0;
6075 mddev
->persistent
= ! info
->not_persistent
;
6076 mddev
->external
= 0;
6078 mddev
->layout
= info
->layout
;
6079 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6081 mddev
->max_disks
= MD_SB_DISKS
;
6083 if (mddev
->persistent
)
6085 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6087 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6088 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6089 mddev
->bitmap_info
.offset
= 0;
6091 mddev
->reshape_position
= MaxSector
;
6094 * Generate a 128 bit UUID
6096 get_random_bytes(mddev
->uuid
, 16);
6098 mddev
->new_level
= mddev
->level
;
6099 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6100 mddev
->new_layout
= mddev
->layout
;
6101 mddev
->delta_disks
= 0;
6102 mddev
->reshape_backwards
= 0;
6107 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6109 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6111 if (mddev
->external_size
)
6114 mddev
->array_sectors
= array_sectors
;
6116 EXPORT_SYMBOL(md_set_array_sectors
);
6118 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6120 struct md_rdev
*rdev
;
6122 int fit
= (num_sectors
== 0);
6124 if (mddev
->pers
->resize
== NULL
)
6126 /* The "num_sectors" is the number of sectors of each device that
6127 * is used. This can only make sense for arrays with redundancy.
6128 * linear and raid0 always use whatever space is available. We can only
6129 * consider changing this number if no resync or reconstruction is
6130 * happening, and if the new size is acceptable. It must fit before the
6131 * sb_start or, if that is <data_offset, it must fit before the size
6132 * of each device. If num_sectors is zero, we find the largest size
6135 if (mddev
->sync_thread
)
6138 rdev_for_each(rdev
, mddev
) {
6139 sector_t avail
= rdev
->sectors
;
6141 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6142 num_sectors
= avail
;
6143 if (avail
< num_sectors
)
6146 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6148 revalidate_disk(mddev
->gendisk
);
6152 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6155 struct md_rdev
*rdev
;
6156 /* change the number of raid disks */
6157 if (mddev
->pers
->check_reshape
== NULL
)
6159 if (raid_disks
<= 0 ||
6160 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6162 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6165 rdev_for_each(rdev
, mddev
) {
6166 if (mddev
->raid_disks
< raid_disks
&&
6167 rdev
->data_offset
< rdev
->new_data_offset
)
6169 if (mddev
->raid_disks
> raid_disks
&&
6170 rdev
->data_offset
> rdev
->new_data_offset
)
6174 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6175 if (mddev
->delta_disks
< 0)
6176 mddev
->reshape_backwards
= 1;
6177 else if (mddev
->delta_disks
> 0)
6178 mddev
->reshape_backwards
= 0;
6180 rv
= mddev
->pers
->check_reshape(mddev
);
6182 mddev
->delta_disks
= 0;
6183 mddev
->reshape_backwards
= 0;
6190 * update_array_info is used to change the configuration of an
6192 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6193 * fields in the info are checked against the array.
6194 * Any differences that cannot be handled will cause an error.
6195 * Normally, only one change can be managed at a time.
6197 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6203 /* calculate expected state,ignoring low bits */
6204 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6205 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6207 if (mddev
->major_version
!= info
->major_version
||
6208 mddev
->minor_version
!= info
->minor_version
||
6209 /* mddev->patch_version != info->patch_version || */
6210 mddev
->ctime
!= info
->ctime
||
6211 mddev
->level
!= info
->level
||
6212 /* mddev->layout != info->layout || */
6213 !mddev
->persistent
!= info
->not_persistent
||
6214 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6215 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6216 ((state
^info
->state
) & 0xfffffe00)
6219 /* Check there is only one change */
6220 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6222 if (mddev
->raid_disks
!= info
->raid_disks
)
6224 if (mddev
->layout
!= info
->layout
)
6226 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6233 if (mddev
->layout
!= info
->layout
) {
6235 * we don't need to do anything at the md level, the
6236 * personality will take care of it all.
6238 if (mddev
->pers
->check_reshape
== NULL
)
6241 mddev
->new_layout
= info
->layout
;
6242 rv
= mddev
->pers
->check_reshape(mddev
);
6244 mddev
->new_layout
= mddev
->layout
;
6248 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6249 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6251 if (mddev
->raid_disks
!= info
->raid_disks
)
6252 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6254 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6255 if (mddev
->pers
->quiesce
== NULL
)
6257 if (mddev
->recovery
|| mddev
->sync_thread
)
6259 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6260 /* add the bitmap */
6263 if (mddev
->bitmap_info
.default_offset
== 0)
6265 mddev
->bitmap_info
.offset
=
6266 mddev
->bitmap_info
.default_offset
;
6267 mddev
->bitmap_info
.space
=
6268 mddev
->bitmap_info
.default_space
;
6269 mddev
->pers
->quiesce(mddev
, 1);
6270 rv
= bitmap_create(mddev
);
6272 rv
= bitmap_load(mddev
);
6274 bitmap_destroy(mddev
);
6275 mddev
->pers
->quiesce(mddev
, 0);
6277 /* remove the bitmap */
6280 if (mddev
->bitmap
->storage
.file
)
6282 mddev
->pers
->quiesce(mddev
, 1);
6283 bitmap_destroy(mddev
);
6284 mddev
->pers
->quiesce(mddev
, 0);
6285 mddev
->bitmap_info
.offset
= 0;
6288 md_update_sb(mddev
, 1);
6292 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6294 struct md_rdev
*rdev
;
6297 if (mddev
->pers
== NULL
)
6301 rdev
= find_rdev_rcu(mddev
, dev
);
6305 md_error(mddev
, rdev
);
6306 if (!test_bit(Faulty
, &rdev
->flags
))
6314 * We have a problem here : there is no easy way to give a CHS
6315 * virtual geometry. We currently pretend that we have a 2 heads
6316 * 4 sectors (with a BIG number of cylinders...). This drives
6317 * dosfs just mad... ;-)
6319 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6321 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6325 geo
->cylinders
= mddev
->array_sectors
/ 8;
6329 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6330 unsigned int cmd
, unsigned long arg
)
6333 void __user
*argp
= (void __user
*)arg
;
6334 struct mddev
*mddev
= NULL
;
6339 case GET_ARRAY_INFO
:
6343 if (!capable(CAP_SYS_ADMIN
))
6348 * Commands dealing with the RAID driver but not any
6353 err
= get_version(argp
);
6356 case PRINT_RAID_DEBUG
:
6364 autostart_arrays(arg
);
6371 * Commands creating/starting a new array:
6374 mddev
= bdev
->bd_disk
->private_data
;
6381 /* Some actions do not requires the mutex */
6383 case GET_ARRAY_INFO
:
6384 if (!mddev
->raid_disks
&& !mddev
->external
)
6387 err
= get_array_info(mddev
, argp
);
6391 if (!mddev
->raid_disks
&& !mddev
->external
)
6394 err
= get_disk_info(mddev
, argp
);
6397 case SET_DISK_FAULTY
:
6398 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6402 if (cmd
== ADD_NEW_DISK
)
6403 /* need to ensure md_delayed_delete() has completed */
6404 flush_workqueue(md_misc_wq
);
6406 if (cmd
== HOT_REMOVE_DISK
)
6407 /* need to ensure recovery thread has run */
6408 wait_event_interruptible_timeout(mddev
->sb_wait
,
6409 !test_bit(MD_RECOVERY_NEEDED
,
6411 msecs_to_jiffies(5000));
6412 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6413 /* Need to flush page cache, and ensure no-one else opens
6416 mutex_lock(&mddev
->open_mutex
);
6417 if (atomic_read(&mddev
->openers
) > 1) {
6418 mutex_unlock(&mddev
->open_mutex
);
6422 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6423 mutex_unlock(&mddev
->open_mutex
);
6424 sync_blockdev(bdev
);
6426 err
= mddev_lock(mddev
);
6429 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6434 if (cmd
== SET_ARRAY_INFO
) {
6435 mdu_array_info_t info
;
6437 memset(&info
, 0, sizeof(info
));
6438 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6443 err
= update_array_info(mddev
, &info
);
6445 printk(KERN_WARNING
"md: couldn't update"
6446 " array info. %d\n", err
);
6451 if (!list_empty(&mddev
->disks
)) {
6453 "md: array %s already has disks!\n",
6458 if (mddev
->raid_disks
) {
6460 "md: array %s already initialised!\n",
6465 err
= set_array_info(mddev
, &info
);
6467 printk(KERN_WARNING
"md: couldn't set"
6468 " array info. %d\n", err
);
6475 * Commands querying/configuring an existing array:
6477 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6478 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6479 if ((!mddev
->raid_disks
&& !mddev
->external
)
6480 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6481 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6482 && cmd
!= GET_BITMAP_FILE
) {
6488 * Commands even a read-only array can execute:
6491 case GET_BITMAP_FILE
:
6492 err
= get_bitmap_file(mddev
, argp
);
6495 case RESTART_ARRAY_RW
:
6496 err
= restart_array(mddev
);
6500 err
= do_md_stop(mddev
, 0, bdev
);
6504 err
= md_set_readonly(mddev
, bdev
);
6507 case HOT_REMOVE_DISK
:
6508 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6512 /* We can support ADD_NEW_DISK on read-only arrays
6513 * on if we are re-adding a preexisting device.
6514 * So require mddev->pers and MD_DISK_SYNC.
6517 mdu_disk_info_t info
;
6518 if (copy_from_user(&info
, argp
, sizeof(info
)))
6520 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6521 /* Need to clear read-only for this */
6524 err
= add_new_disk(mddev
, &info
);
6530 if (get_user(ro
, (int __user
*)(arg
))) {
6536 /* if the bdev is going readonly the value of mddev->ro
6537 * does not matter, no writes are coming
6542 /* are we are already prepared for writes? */
6546 /* transitioning to readauto need only happen for
6547 * arrays that call md_write_start
6550 err
= restart_array(mddev
);
6553 set_disk_ro(mddev
->gendisk
, 0);
6560 * The remaining ioctls are changing the state of the
6561 * superblock, so we do not allow them on read-only arrays.
6562 * However non-MD ioctls (e.g. get-size) will still come through
6563 * here and hit the 'default' below, so only disallow
6564 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6566 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6567 if (mddev
->ro
== 2) {
6569 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6570 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6571 /* mddev_unlock will wake thread */
6572 /* If a device failed while we were read-only, we
6573 * need to make sure the metadata is updated now.
6575 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6576 mddev_unlock(mddev
);
6577 wait_event(mddev
->sb_wait
,
6578 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6579 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6580 mddev_lock_nointr(mddev
);
6591 mdu_disk_info_t info
;
6592 if (copy_from_user(&info
, argp
, sizeof(info
)))
6595 err
= add_new_disk(mddev
, &info
);
6600 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6604 err
= do_md_run(mddev
);
6607 case SET_BITMAP_FILE
:
6608 err
= set_bitmap_file(mddev
, (int)arg
);
6618 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6620 mddev
->hold_active
= 0;
6621 mddev_unlock(mddev
);
6630 #ifdef CONFIG_COMPAT
6631 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6632 unsigned int cmd
, unsigned long arg
)
6635 case HOT_REMOVE_DISK
:
6637 case SET_DISK_FAULTY
:
6638 case SET_BITMAP_FILE
:
6639 /* These take in integer arg, do not convert */
6642 arg
= (unsigned long)compat_ptr(arg
);
6646 return md_ioctl(bdev
, mode
, cmd
, arg
);
6648 #endif /* CONFIG_COMPAT */
6650 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6653 * Succeed if we can lock the mddev, which confirms that
6654 * it isn't being stopped right now.
6656 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6662 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6663 /* we are racing with mddev_put which is discarding this
6667 /* Wait until bdev->bd_disk is definitely gone */
6668 flush_workqueue(md_misc_wq
);
6669 /* Then retry the open from the top */
6670 return -ERESTARTSYS
;
6672 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6674 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6678 atomic_inc(&mddev
->openers
);
6679 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6680 mutex_unlock(&mddev
->open_mutex
);
6682 check_disk_change(bdev
);
6687 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6689 struct mddev
*mddev
= disk
->private_data
;
6692 atomic_dec(&mddev
->openers
);
6696 static int md_media_changed(struct gendisk
*disk
)
6698 struct mddev
*mddev
= disk
->private_data
;
6700 return mddev
->changed
;
6703 static int md_revalidate(struct gendisk
*disk
)
6705 struct mddev
*mddev
= disk
->private_data
;
6710 static const struct block_device_operations md_fops
=
6712 .owner
= THIS_MODULE
,
6714 .release
= md_release
,
6716 #ifdef CONFIG_COMPAT
6717 .compat_ioctl
= md_compat_ioctl
,
6719 .getgeo
= md_getgeo
,
6720 .media_changed
= md_media_changed
,
6721 .revalidate_disk
= md_revalidate
,
6724 static int md_thread(void * arg
)
6726 struct md_thread
*thread
= arg
;
6729 * md_thread is a 'system-thread', it's priority should be very
6730 * high. We avoid resource deadlocks individually in each
6731 * raid personality. (RAID5 does preallocation) We also use RR and
6732 * the very same RT priority as kswapd, thus we will never get
6733 * into a priority inversion deadlock.
6735 * we definitely have to have equal or higher priority than
6736 * bdflush, otherwise bdflush will deadlock if there are too
6737 * many dirty RAID5 blocks.
6740 allow_signal(SIGKILL
);
6741 while (!kthread_should_stop()) {
6743 /* We need to wait INTERRUPTIBLE so that
6744 * we don't add to the load-average.
6745 * That means we need to be sure no signals are
6748 if (signal_pending(current
))
6749 flush_signals(current
);
6751 wait_event_interruptible_timeout
6753 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6754 || kthread_should_stop(),
6757 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6758 if (!kthread_should_stop())
6759 thread
->run(thread
);
6765 void md_wakeup_thread(struct md_thread
*thread
)
6768 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6769 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6770 wake_up(&thread
->wqueue
);
6774 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6775 struct mddev
*mddev
, const char *name
)
6777 struct md_thread
*thread
;
6779 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6783 init_waitqueue_head(&thread
->wqueue
);
6786 thread
->mddev
= mddev
;
6787 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6788 thread
->tsk
= kthread_run(md_thread
, thread
,
6790 mdname(thread
->mddev
),
6792 if (IS_ERR(thread
->tsk
)) {
6799 void md_unregister_thread(struct md_thread
**threadp
)
6801 struct md_thread
*thread
= *threadp
;
6804 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6805 /* Locking ensures that mddev_unlock does not wake_up a
6806 * non-existent thread
6808 spin_lock(&pers_lock
);
6810 spin_unlock(&pers_lock
);
6812 kthread_stop(thread
->tsk
);
6816 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6823 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6826 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6828 mddev
->pers
->error_handler(mddev
,rdev
);
6829 if (mddev
->degraded
)
6830 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6831 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6832 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6833 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6834 md_wakeup_thread(mddev
->thread
);
6835 if (mddev
->event_work
.func
)
6836 queue_work(md_misc_wq
, &mddev
->event_work
);
6837 md_new_event_inintr(mddev
);
6840 /* seq_file implementation /proc/mdstat */
6842 static void status_unused(struct seq_file
*seq
)
6845 struct md_rdev
*rdev
;
6847 seq_printf(seq
, "unused devices: ");
6849 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6850 char b
[BDEVNAME_SIZE
];
6852 seq_printf(seq
, "%s ",
6853 bdevname(rdev
->bdev
,b
));
6856 seq_printf(seq
, "<none>");
6858 seq_printf(seq
, "\n");
6862 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6864 sector_t max_sectors
, resync
, res
;
6865 unsigned long dt
, db
;
6868 unsigned int per_milli
;
6870 if (mddev
->curr_resync
<= 3)
6873 resync
= mddev
->curr_resync
6874 - atomic_read(&mddev
->recovery_active
);
6876 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6877 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6878 max_sectors
= mddev
->resync_max_sectors
;
6880 max_sectors
= mddev
->dev_sectors
;
6883 * Should not happen.
6889 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6890 * in a sector_t, and (max_sectors>>scale) will fit in a
6891 * u32, as those are the requirements for sector_div.
6892 * Thus 'scale' must be at least 10
6895 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6896 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6899 res
= (resync
>>scale
)*1000;
6900 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6904 int i
, x
= per_milli
/50, y
= 20-x
;
6905 seq_printf(seq
, "[");
6906 for (i
= 0; i
< x
; i
++)
6907 seq_printf(seq
, "=");
6908 seq_printf(seq
, ">");
6909 for (i
= 0; i
< y
; i
++)
6910 seq_printf(seq
, ".");
6911 seq_printf(seq
, "] ");
6913 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6914 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6916 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6918 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6919 "resync" : "recovery"))),
6920 per_milli
/10, per_milli
% 10,
6921 (unsigned long long) resync
/2,
6922 (unsigned long long) max_sectors
/2);
6925 * dt: time from mark until now
6926 * db: blocks written from mark until now
6927 * rt: remaining time
6929 * rt is a sector_t, so could be 32bit or 64bit.
6930 * So we divide before multiply in case it is 32bit and close
6932 * We scale the divisor (db) by 32 to avoid losing precision
6933 * near the end of resync when the number of remaining sectors
6935 * We then divide rt by 32 after multiplying by db to compensate.
6936 * The '+1' avoids division by zero if db is very small.
6938 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6940 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6941 - mddev
->resync_mark_cnt
;
6943 rt
= max_sectors
- resync
; /* number of remaining sectors */
6944 sector_div(rt
, db
/32+1);
6948 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6949 ((unsigned long)rt
% 60)/6);
6951 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6954 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6956 struct list_head
*tmp
;
6958 struct mddev
*mddev
;
6966 spin_lock(&all_mddevs_lock
);
6967 list_for_each(tmp
,&all_mddevs
)
6969 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6971 spin_unlock(&all_mddevs_lock
);
6974 spin_unlock(&all_mddevs_lock
);
6976 return (void*)2;/* tail */
6980 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6982 struct list_head
*tmp
;
6983 struct mddev
*next_mddev
, *mddev
= v
;
6989 spin_lock(&all_mddevs_lock
);
6991 tmp
= all_mddevs
.next
;
6993 tmp
= mddev
->all_mddevs
.next
;
6994 if (tmp
!= &all_mddevs
)
6995 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6997 next_mddev
= (void*)2;
7000 spin_unlock(&all_mddevs_lock
);
7008 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7010 struct mddev
*mddev
= v
;
7012 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7016 static int md_seq_show(struct seq_file
*seq
, void *v
)
7018 struct mddev
*mddev
= v
;
7020 struct md_rdev
*rdev
;
7022 if (v
== (void*)1) {
7023 struct md_personality
*pers
;
7024 seq_printf(seq
, "Personalities : ");
7025 spin_lock(&pers_lock
);
7026 list_for_each_entry(pers
, &pers_list
, list
)
7027 seq_printf(seq
, "[%s] ", pers
->name
);
7029 spin_unlock(&pers_lock
);
7030 seq_printf(seq
, "\n");
7031 seq
->poll_event
= atomic_read(&md_event_count
);
7034 if (v
== (void*)2) {
7039 if (mddev_lock(mddev
) < 0)
7042 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7043 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7044 mddev
->pers
? "" : "in");
7047 seq_printf(seq
, " (read-only)");
7049 seq_printf(seq
, " (auto-read-only)");
7050 seq_printf(seq
, " %s", mddev
->pers
->name
);
7054 rdev_for_each(rdev
, mddev
) {
7055 char b
[BDEVNAME_SIZE
];
7056 seq_printf(seq
, " %s[%d]",
7057 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7058 if (test_bit(WriteMostly
, &rdev
->flags
))
7059 seq_printf(seq
, "(W)");
7060 if (test_bit(Faulty
, &rdev
->flags
)) {
7061 seq_printf(seq
, "(F)");
7064 if (rdev
->raid_disk
< 0)
7065 seq_printf(seq
, "(S)"); /* spare */
7066 if (test_bit(Replacement
, &rdev
->flags
))
7067 seq_printf(seq
, "(R)");
7068 sectors
+= rdev
->sectors
;
7071 if (!list_empty(&mddev
->disks
)) {
7073 seq_printf(seq
, "\n %llu blocks",
7074 (unsigned long long)
7075 mddev
->array_sectors
/ 2);
7077 seq_printf(seq
, "\n %llu blocks",
7078 (unsigned long long)sectors
/ 2);
7080 if (mddev
->persistent
) {
7081 if (mddev
->major_version
!= 0 ||
7082 mddev
->minor_version
!= 90) {
7083 seq_printf(seq
," super %d.%d",
7084 mddev
->major_version
,
7085 mddev
->minor_version
);
7087 } else if (mddev
->external
)
7088 seq_printf(seq
, " super external:%s",
7089 mddev
->metadata_type
);
7091 seq_printf(seq
, " super non-persistent");
7094 mddev
->pers
->status(seq
, mddev
);
7095 seq_printf(seq
, "\n ");
7096 if (mddev
->pers
->sync_request
) {
7097 if (mddev
->curr_resync
> 2) {
7098 status_resync(seq
, mddev
);
7099 seq_printf(seq
, "\n ");
7100 } else if (mddev
->curr_resync
>= 1)
7101 seq_printf(seq
, "\tresync=DELAYED\n ");
7102 else if (mddev
->recovery_cp
< MaxSector
)
7103 seq_printf(seq
, "\tresync=PENDING\n ");
7106 seq_printf(seq
, "\n ");
7108 bitmap_status(seq
, mddev
->bitmap
);
7110 seq_printf(seq
, "\n");
7112 mddev_unlock(mddev
);
7117 static const struct seq_operations md_seq_ops
= {
7118 .start
= md_seq_start
,
7119 .next
= md_seq_next
,
7120 .stop
= md_seq_stop
,
7121 .show
= md_seq_show
,
7124 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7126 struct seq_file
*seq
;
7129 error
= seq_open(file
, &md_seq_ops
);
7133 seq
= file
->private_data
;
7134 seq
->poll_event
= atomic_read(&md_event_count
);
7138 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7140 struct seq_file
*seq
= filp
->private_data
;
7143 poll_wait(filp
, &md_event_waiters
, wait
);
7145 /* always allow read */
7146 mask
= POLLIN
| POLLRDNORM
;
7148 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7149 mask
|= POLLERR
| POLLPRI
;
7153 static const struct file_operations md_seq_fops
= {
7154 .owner
= THIS_MODULE
,
7155 .open
= md_seq_open
,
7157 .llseek
= seq_lseek
,
7158 .release
= seq_release_private
,
7159 .poll
= mdstat_poll
,
7162 int register_md_personality(struct md_personality
*p
)
7164 spin_lock(&pers_lock
);
7165 list_add_tail(&p
->list
, &pers_list
);
7166 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7167 spin_unlock(&pers_lock
);
7171 int unregister_md_personality(struct md_personality
*p
)
7173 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7174 spin_lock(&pers_lock
);
7175 list_del_init(&p
->list
);
7176 spin_unlock(&pers_lock
);
7180 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7182 struct md_rdev
* rdev
;
7188 rdev_for_each_rcu(rdev
, mddev
) {
7189 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7190 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7191 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7192 atomic_read(&disk
->sync_io
);
7193 /* sync IO will cause sync_io to increase before the disk_stats
7194 * as sync_io is counted when a request starts, and
7195 * disk_stats is counted when it completes.
7196 * So resync activity will cause curr_events to be smaller than
7197 * when there was no such activity.
7198 * non-sync IO will cause disk_stat to increase without
7199 * increasing sync_io so curr_events will (eventually)
7200 * be larger than it was before. Once it becomes
7201 * substantially larger, the test below will cause
7202 * the array to appear non-idle, and resync will slow
7204 * If there is a lot of outstanding resync activity when
7205 * we set last_event to curr_events, then all that activity
7206 * completing might cause the array to appear non-idle
7207 * and resync will be slowed down even though there might
7208 * not have been non-resync activity. This will only
7209 * happen once though. 'last_events' will soon reflect
7210 * the state where there is little or no outstanding
7211 * resync requests, and further resync activity will
7212 * always make curr_events less than last_events.
7215 if (init
|| curr_events
- rdev
->last_events
> 64) {
7216 rdev
->last_events
= curr_events
;
7224 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7226 /* another "blocks" (512byte) blocks have been synced */
7227 atomic_sub(blocks
, &mddev
->recovery_active
);
7228 wake_up(&mddev
->recovery_wait
);
7230 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7231 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7232 md_wakeup_thread(mddev
->thread
);
7233 // stop recovery, signal do_sync ....
7238 /* md_write_start(mddev, bi)
7239 * If we need to update some array metadata (e.g. 'active' flag
7240 * in superblock) before writing, schedule a superblock update
7241 * and wait for it to complete.
7243 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7246 if (bio_data_dir(bi
) != WRITE
)
7249 BUG_ON(mddev
->ro
== 1);
7250 if (mddev
->ro
== 2) {
7251 /* need to switch to read/write */
7253 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7254 md_wakeup_thread(mddev
->thread
);
7255 md_wakeup_thread(mddev
->sync_thread
);
7258 atomic_inc(&mddev
->writes_pending
);
7259 if (mddev
->safemode
== 1)
7260 mddev
->safemode
= 0;
7261 if (mddev
->in_sync
) {
7262 spin_lock_irq(&mddev
->write_lock
);
7263 if (mddev
->in_sync
) {
7265 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7266 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7267 md_wakeup_thread(mddev
->thread
);
7270 spin_unlock_irq(&mddev
->write_lock
);
7273 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7274 wait_event(mddev
->sb_wait
,
7275 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7278 void md_write_end(struct mddev
*mddev
)
7280 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7281 if (mddev
->safemode
== 2)
7282 md_wakeup_thread(mddev
->thread
);
7283 else if (mddev
->safemode_delay
)
7284 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7288 /* md_allow_write(mddev)
7289 * Calling this ensures that the array is marked 'active' so that writes
7290 * may proceed without blocking. It is important to call this before
7291 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7292 * Must be called with mddev_lock held.
7294 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7295 * is dropped, so return -EAGAIN after notifying userspace.
7297 int md_allow_write(struct mddev
*mddev
)
7303 if (!mddev
->pers
->sync_request
)
7306 spin_lock_irq(&mddev
->write_lock
);
7307 if (mddev
->in_sync
) {
7309 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7310 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7311 if (mddev
->safemode_delay
&&
7312 mddev
->safemode
== 0)
7313 mddev
->safemode
= 1;
7314 spin_unlock_irq(&mddev
->write_lock
);
7315 md_update_sb(mddev
, 0);
7316 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7318 spin_unlock_irq(&mddev
->write_lock
);
7320 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7325 EXPORT_SYMBOL_GPL(md_allow_write
);
7327 #define SYNC_MARKS 10
7328 #define SYNC_MARK_STEP (3*HZ)
7329 #define UPDATE_FREQUENCY (5*60*HZ)
7330 void md_do_sync(struct md_thread
*thread
)
7332 struct mddev
*mddev
= thread
->mddev
;
7333 struct mddev
*mddev2
;
7334 unsigned int currspeed
= 0,
7336 sector_t max_sectors
,j
, io_sectors
;
7337 unsigned long mark
[SYNC_MARKS
];
7338 unsigned long update_time
;
7339 sector_t mark_cnt
[SYNC_MARKS
];
7341 struct list_head
*tmp
;
7342 sector_t last_check
;
7344 struct md_rdev
*rdev
;
7345 char *desc
, *action
= NULL
;
7346 struct blk_plug plug
;
7348 /* just incase thread restarts... */
7349 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7351 if (mddev
->ro
) /* never try to sync a read-only array */
7354 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7355 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7356 desc
= "data-check";
7358 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7359 desc
= "requested-resync";
7363 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7368 mddev
->last_sync_action
= action
?: desc
;
7370 /* we overload curr_resync somewhat here.
7371 * 0 == not engaged in resync at all
7372 * 2 == checking that there is no conflict with another sync
7373 * 1 == like 2, but have yielded to allow conflicting resync to
7375 * other == active in resync - this many blocks
7377 * Before starting a resync we must have set curr_resync to
7378 * 2, and then checked that every "conflicting" array has curr_resync
7379 * less than ours. When we find one that is the same or higher
7380 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7381 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7382 * This will mean we have to start checking from the beginning again.
7387 mddev
->curr_resync
= 2;
7390 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7392 for_each_mddev(mddev2
, tmp
) {
7393 if (mddev2
== mddev
)
7395 if (!mddev
->parallel_resync
7396 && mddev2
->curr_resync
7397 && match_mddev_units(mddev
, mddev2
)) {
7399 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7400 /* arbitrarily yield */
7401 mddev
->curr_resync
= 1;
7402 wake_up(&resync_wait
);
7404 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7405 /* no need to wait here, we can wait the next
7406 * time 'round when curr_resync == 2
7409 /* We need to wait 'interruptible' so as not to
7410 * contribute to the load average, and not to
7411 * be caught by 'softlockup'
7413 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7414 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7415 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7416 printk(KERN_INFO
"md: delaying %s of %s"
7417 " until %s has finished (they"
7418 " share one or more physical units)\n",
7419 desc
, mdname(mddev
), mdname(mddev2
));
7421 if (signal_pending(current
))
7422 flush_signals(current
);
7424 finish_wait(&resync_wait
, &wq
);
7427 finish_wait(&resync_wait
, &wq
);
7430 } while (mddev
->curr_resync
< 2);
7433 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7434 /* resync follows the size requested by the personality,
7435 * which defaults to physical size, but can be virtual size
7437 max_sectors
= mddev
->resync_max_sectors
;
7438 atomic64_set(&mddev
->resync_mismatches
, 0);
7439 /* we don't use the checkpoint if there's a bitmap */
7440 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7441 j
= mddev
->resync_min
;
7442 else if (!mddev
->bitmap
)
7443 j
= mddev
->recovery_cp
;
7445 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7446 max_sectors
= mddev
->resync_max_sectors
;
7448 /* recovery follows the physical size of devices */
7449 max_sectors
= mddev
->dev_sectors
;
7452 rdev_for_each_rcu(rdev
, mddev
)
7453 if (rdev
->raid_disk
>= 0 &&
7454 !test_bit(Faulty
, &rdev
->flags
) &&
7455 !test_bit(In_sync
, &rdev
->flags
) &&
7456 rdev
->recovery_offset
< j
)
7457 j
= rdev
->recovery_offset
;
7461 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7462 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7463 " %d KB/sec/disk.\n", speed_min(mddev
));
7464 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7465 "(but not more than %d KB/sec) for %s.\n",
7466 speed_max(mddev
), desc
);
7468 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7471 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7473 mark_cnt
[m
] = io_sectors
;
7476 mddev
->resync_mark
= mark
[last_mark
];
7477 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7480 * Tune reconstruction:
7482 window
= 32*(PAGE_SIZE
/512);
7483 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7484 window
/2, (unsigned long long)max_sectors
/2);
7486 atomic_set(&mddev
->recovery_active
, 0);
7491 "md: resuming %s of %s from checkpoint.\n",
7492 desc
, mdname(mddev
));
7493 mddev
->curr_resync
= j
;
7495 mddev
->curr_resync
= 3; /* no longer delayed */
7496 mddev
->curr_resync_completed
= j
;
7497 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7498 md_new_event(mddev
);
7499 update_time
= jiffies
;
7501 blk_start_plug(&plug
);
7502 while (j
< max_sectors
) {
7507 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7508 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7509 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7510 > (max_sectors
>> 4)) ||
7511 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7512 (j
- mddev
->curr_resync_completed
)*2
7513 >= mddev
->resync_max
- mddev
->curr_resync_completed
7515 /* time to update curr_resync_completed */
7516 wait_event(mddev
->recovery_wait
,
7517 atomic_read(&mddev
->recovery_active
) == 0);
7518 mddev
->curr_resync_completed
= j
;
7519 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7520 j
> mddev
->recovery_cp
)
7521 mddev
->recovery_cp
= j
;
7522 update_time
= jiffies
;
7523 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7524 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7527 while (j
>= mddev
->resync_max
&&
7528 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7529 /* As this condition is controlled by user-space,
7530 * we can block indefinitely, so use '_interruptible'
7531 * to avoid triggering warnings.
7533 flush_signals(current
); /* just in case */
7534 wait_event_interruptible(mddev
->recovery_wait
,
7535 mddev
->resync_max
> j
7536 || test_bit(MD_RECOVERY_INTR
,
7540 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7543 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7544 currspeed
< speed_min(mddev
));
7546 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7550 if (!skipped
) { /* actual IO requested */
7551 io_sectors
+= sectors
;
7552 atomic_add(sectors
, &mddev
->recovery_active
);
7555 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7560 mddev
->curr_resync
= j
;
7561 mddev
->curr_mark_cnt
= io_sectors
;
7562 if (last_check
== 0)
7563 /* this is the earliest that rebuild will be
7564 * visible in /proc/mdstat
7566 md_new_event(mddev
);
7568 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7571 last_check
= io_sectors
;
7573 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7575 int next
= (last_mark
+1) % SYNC_MARKS
;
7577 mddev
->resync_mark
= mark
[next
];
7578 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7579 mark
[next
] = jiffies
;
7580 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7584 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7588 * this loop exits only if either when we are slower than
7589 * the 'hard' speed limit, or the system was IO-idle for
7591 * the system might be non-idle CPU-wise, but we only care
7592 * about not overloading the IO subsystem. (things like an
7593 * e2fsck being done on the RAID array should execute fast)
7597 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7598 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7600 if (currspeed
> speed_min(mddev
)) {
7601 if ((currspeed
> speed_max(mddev
)) ||
7602 !is_mddev_idle(mddev
, 0)) {
7608 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7609 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7610 ? "interrupted" : "done");
7612 * this also signals 'finished resyncing' to md_stop
7614 blk_finish_plug(&plug
);
7615 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7617 /* tell personality that we are finished */
7618 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7620 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7621 mddev
->curr_resync
> 2) {
7622 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7623 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7624 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7626 "md: checkpointing %s of %s.\n",
7627 desc
, mdname(mddev
));
7628 if (test_bit(MD_RECOVERY_ERROR
,
7630 mddev
->recovery_cp
=
7631 mddev
->curr_resync_completed
;
7633 mddev
->recovery_cp
=
7637 mddev
->recovery_cp
= MaxSector
;
7639 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7640 mddev
->curr_resync
= MaxSector
;
7642 rdev_for_each_rcu(rdev
, mddev
)
7643 if (rdev
->raid_disk
>= 0 &&
7644 mddev
->delta_disks
>= 0 &&
7645 !test_bit(Faulty
, &rdev
->flags
) &&
7646 !test_bit(In_sync
, &rdev
->flags
) &&
7647 rdev
->recovery_offset
< mddev
->curr_resync
)
7648 rdev
->recovery_offset
= mddev
->curr_resync
;
7653 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7655 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7656 /* We completed so min/max setting can be forgotten if used. */
7657 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7658 mddev
->resync_min
= 0;
7659 mddev
->resync_max
= MaxSector
;
7660 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7661 mddev
->resync_min
= mddev
->curr_resync_completed
;
7662 mddev
->curr_resync
= 0;
7663 wake_up(&resync_wait
);
7664 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7665 md_wakeup_thread(mddev
->thread
);
7668 EXPORT_SYMBOL_GPL(md_do_sync
);
7670 static int remove_and_add_spares(struct mddev
*mddev
,
7671 struct md_rdev
*this)
7673 struct md_rdev
*rdev
;
7677 rdev_for_each(rdev
, mddev
)
7678 if ((this == NULL
|| rdev
== this) &&
7679 rdev
->raid_disk
>= 0 &&
7680 !test_bit(Blocked
, &rdev
->flags
) &&
7681 (test_bit(Faulty
, &rdev
->flags
) ||
7682 ! test_bit(In_sync
, &rdev
->flags
)) &&
7683 atomic_read(&rdev
->nr_pending
)==0) {
7684 if (mddev
->pers
->hot_remove_disk(
7685 mddev
, rdev
) == 0) {
7686 sysfs_unlink_rdev(mddev
, rdev
);
7687 rdev
->raid_disk
= -1;
7691 if (removed
&& mddev
->kobj
.sd
)
7692 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7697 rdev_for_each(rdev
, mddev
) {
7698 if (rdev
->raid_disk
>= 0 &&
7699 !test_bit(In_sync
, &rdev
->flags
) &&
7700 !test_bit(Faulty
, &rdev
->flags
))
7702 if (rdev
->raid_disk
>= 0)
7704 if (test_bit(Faulty
, &rdev
->flags
))
7707 rdev
->saved_raid_disk
< 0)
7710 rdev
->recovery_offset
= 0;
7712 hot_add_disk(mddev
, rdev
) == 0) {
7713 if (sysfs_link_rdev(mddev
, rdev
))
7714 /* failure here is OK */;
7716 md_new_event(mddev
);
7717 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7722 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7727 * This routine is regularly called by all per-raid-array threads to
7728 * deal with generic issues like resync and super-block update.
7729 * Raid personalities that don't have a thread (linear/raid0) do not
7730 * need this as they never do any recovery or update the superblock.
7732 * It does not do any resync itself, but rather "forks" off other threads
7733 * to do that as needed.
7734 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7735 * "->recovery" and create a thread at ->sync_thread.
7736 * When the thread finishes it sets MD_RECOVERY_DONE
7737 * and wakeups up this thread which will reap the thread and finish up.
7738 * This thread also removes any faulty devices (with nr_pending == 0).
7740 * The overall approach is:
7741 * 1/ if the superblock needs updating, update it.
7742 * 2/ If a recovery thread is running, don't do anything else.
7743 * 3/ If recovery has finished, clean up, possibly marking spares active.
7744 * 4/ If there are any faulty devices, remove them.
7745 * 5/ If array is degraded, try to add spares devices
7746 * 6/ If array has spares or is not in-sync, start a resync thread.
7748 void md_check_recovery(struct mddev
*mddev
)
7750 if (mddev
->suspended
)
7754 bitmap_daemon_work(mddev
);
7756 if (signal_pending(current
)) {
7757 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7758 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7760 mddev
->safemode
= 2;
7762 flush_signals(current
);
7765 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7768 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7769 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7770 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7771 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7772 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7773 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7777 if (mddev_trylock(mddev
)) {
7781 /* On a read-only array we can:
7782 * - remove failed devices
7783 * - add already-in_sync devices if the array itself
7785 * As we only add devices that are already in-sync,
7786 * we can activate the spares immediately.
7788 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7789 remove_and_add_spares(mddev
, NULL
);
7790 mddev
->pers
->spare_active(mddev
);
7794 if (!mddev
->external
) {
7796 spin_lock_irq(&mddev
->write_lock
);
7797 if (mddev
->safemode
&&
7798 !atomic_read(&mddev
->writes_pending
) &&
7800 mddev
->recovery_cp
== MaxSector
) {
7803 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7805 if (mddev
->safemode
== 1)
7806 mddev
->safemode
= 0;
7807 spin_unlock_irq(&mddev
->write_lock
);
7809 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7812 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7813 md_update_sb(mddev
, 0);
7815 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7816 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7817 /* resync/recovery still happening */
7818 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7821 if (mddev
->sync_thread
) {
7822 md_reap_sync_thread(mddev
);
7825 /* Set RUNNING before clearing NEEDED to avoid
7826 * any transients in the value of "sync_action".
7828 mddev
->curr_resync_completed
= 0;
7829 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7830 /* Clear some bits that don't mean anything, but
7833 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7834 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7836 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7837 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7839 /* no recovery is running.
7840 * remove any failed drives, then
7841 * add spares if possible.
7842 * Spares are also removed and re-added, to allow
7843 * the personality to fail the re-add.
7846 if (mddev
->reshape_position
!= MaxSector
) {
7847 if (mddev
->pers
->check_reshape
== NULL
||
7848 mddev
->pers
->check_reshape(mddev
) != 0)
7849 /* Cannot proceed */
7851 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7852 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7853 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7854 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7855 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7856 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7857 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7858 } else if (mddev
->recovery_cp
< MaxSector
) {
7859 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7860 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7861 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7862 /* nothing to be done ... */
7865 if (mddev
->pers
->sync_request
) {
7867 /* We are adding a device or devices to an array
7868 * which has the bitmap stored on all devices.
7869 * So make sure all bitmap pages get written
7871 bitmap_write_all(mddev
->bitmap
);
7873 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7876 if (!mddev
->sync_thread
) {
7877 printk(KERN_ERR
"%s: could not start resync"
7880 /* leave the spares where they are, it shouldn't hurt */
7881 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7882 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7883 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7884 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7885 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7887 md_wakeup_thread(mddev
->sync_thread
);
7888 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7889 md_new_event(mddev
);
7892 wake_up(&mddev
->sb_wait
);
7894 if (!mddev
->sync_thread
) {
7895 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7896 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7898 if (mddev
->sysfs_action
)
7899 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7901 mddev_unlock(mddev
);
7905 void md_reap_sync_thread(struct mddev
*mddev
)
7907 struct md_rdev
*rdev
;
7909 /* resync has finished, collect result */
7910 md_unregister_thread(&mddev
->sync_thread
);
7911 wake_up(&resync_wait
);
7912 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7913 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7915 /* activate any spares */
7916 if (mddev
->pers
->spare_active(mddev
)) {
7917 sysfs_notify(&mddev
->kobj
, NULL
,
7919 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7922 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7923 mddev
->pers
->finish_reshape
)
7924 mddev
->pers
->finish_reshape(mddev
);
7926 /* If array is no-longer degraded, then any saved_raid_disk
7927 * information must be scrapped. Also if any device is now
7928 * In_sync we must scrape the saved_raid_disk for that device
7929 * do the superblock for an incrementally recovered device
7932 rdev_for_each(rdev
, mddev
)
7933 if (!mddev
->degraded
||
7934 test_bit(In_sync
, &rdev
->flags
))
7935 rdev
->saved_raid_disk
= -1;
7937 md_update_sb(mddev
, 1);
7938 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7939 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7940 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7941 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7942 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7943 /* flag recovery needed just to double check */
7944 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7945 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7946 md_new_event(mddev
);
7947 if (mddev
->event_work
.func
)
7948 queue_work(md_misc_wq
, &mddev
->event_work
);
7951 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7953 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7954 wait_event_timeout(rdev
->blocked_wait
,
7955 !test_bit(Blocked
, &rdev
->flags
) &&
7956 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7957 msecs_to_jiffies(5000));
7958 rdev_dec_pending(rdev
, mddev
);
7960 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7962 void md_finish_reshape(struct mddev
*mddev
)
7964 /* called be personality module when reshape completes. */
7965 struct md_rdev
*rdev
;
7967 rdev_for_each(rdev
, mddev
) {
7968 if (rdev
->data_offset
> rdev
->new_data_offset
)
7969 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7971 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7972 rdev
->data_offset
= rdev
->new_data_offset
;
7975 EXPORT_SYMBOL(md_finish_reshape
);
7977 /* Bad block management.
7978 * We can record which blocks on each device are 'bad' and so just
7979 * fail those blocks, or that stripe, rather than the whole device.
7980 * Entries in the bad-block table are 64bits wide. This comprises:
7981 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7982 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7983 * A 'shift' can be set so that larger blocks are tracked and
7984 * consequently larger devices can be covered.
7985 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7987 * Locking of the bad-block table uses a seqlock so md_is_badblock
7988 * might need to retry if it is very unlucky.
7989 * We will sometimes want to check for bad blocks in a bi_end_io function,
7990 * so we use the write_seqlock_irq variant.
7992 * When looking for a bad block we specify a range and want to
7993 * know if any block in the range is bad. So we binary-search
7994 * to the last range that starts at-or-before the given endpoint,
7995 * (or "before the sector after the target range")
7996 * then see if it ends after the given start.
7998 * 0 if there are no known bad blocks in the range
7999 * 1 if there are known bad block which are all acknowledged
8000 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8001 * plus the start/length of the first bad section we overlap.
8003 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8004 sector_t
*first_bad
, int *bad_sectors
)
8010 sector_t target
= s
+ sectors
;
8013 if (bb
->shift
> 0) {
8014 /* round the start down, and the end up */
8016 target
+= (1<<bb
->shift
) - 1;
8017 target
>>= bb
->shift
;
8018 sectors
= target
- s
;
8020 /* 'target' is now the first block after the bad range */
8023 seq
= read_seqbegin(&bb
->lock
);
8028 /* Binary search between lo and hi for 'target'
8029 * i.e. for the last range that starts before 'target'
8031 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8032 * are known not to be the last range before target.
8033 * VARIANT: hi-lo is the number of possible
8034 * ranges, and decreases until it reaches 1
8036 while (hi
- lo
> 1) {
8037 int mid
= (lo
+ hi
) / 2;
8038 sector_t a
= BB_OFFSET(p
[mid
]);
8040 /* This could still be the one, earlier ranges
8044 /* This and later ranges are definitely out. */
8047 /* 'lo' might be the last that started before target, but 'hi' isn't */
8049 /* need to check all range that end after 's' to see if
8050 * any are unacknowledged.
8053 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8054 if (BB_OFFSET(p
[lo
]) < target
) {
8055 /* starts before the end, and finishes after
8056 * the start, so they must overlap
8058 if (rv
!= -1 && BB_ACK(p
[lo
]))
8062 *first_bad
= BB_OFFSET(p
[lo
]);
8063 *bad_sectors
= BB_LEN(p
[lo
]);
8069 if (read_seqretry(&bb
->lock
, seq
))
8074 EXPORT_SYMBOL_GPL(md_is_badblock
);
8077 * Add a range of bad blocks to the table.
8078 * This might extend the table, or might contract it
8079 * if two adjacent ranges can be merged.
8080 * We binary-search to find the 'insertion' point, then
8081 * decide how best to handle it.
8083 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8089 unsigned long flags
;
8092 /* badblocks are disabled */
8096 /* round the start down, and the end up */
8097 sector_t next
= s
+ sectors
;
8099 next
+= (1<<bb
->shift
) - 1;
8104 write_seqlock_irqsave(&bb
->lock
, flags
);
8109 /* Find the last range that starts at-or-before 's' */
8110 while (hi
- lo
> 1) {
8111 int mid
= (lo
+ hi
) / 2;
8112 sector_t a
= BB_OFFSET(p
[mid
]);
8118 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8122 /* we found a range that might merge with the start
8125 sector_t a
= BB_OFFSET(p
[lo
]);
8126 sector_t e
= a
+ BB_LEN(p
[lo
]);
8127 int ack
= BB_ACK(p
[lo
]);
8129 /* Yes, we can merge with a previous range */
8130 if (s
== a
&& s
+ sectors
>= e
)
8131 /* new range covers old */
8134 ack
= ack
&& acknowledged
;
8136 if (e
< s
+ sectors
)
8138 if (e
- a
<= BB_MAX_LEN
) {
8139 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8142 /* does not all fit in one range,
8143 * make p[lo] maximal
8145 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8146 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8152 if (sectors
&& hi
< bb
->count
) {
8153 /* 'hi' points to the first range that starts after 's'.
8154 * Maybe we can merge with the start of that range */
8155 sector_t a
= BB_OFFSET(p
[hi
]);
8156 sector_t e
= a
+ BB_LEN(p
[hi
]);
8157 int ack
= BB_ACK(p
[hi
]);
8158 if (a
<= s
+ sectors
) {
8159 /* merging is possible */
8160 if (e
<= s
+ sectors
) {
8165 ack
= ack
&& acknowledged
;
8168 if (e
- a
<= BB_MAX_LEN
) {
8169 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8172 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8180 if (sectors
== 0 && hi
< bb
->count
) {
8181 /* we might be able to combine lo and hi */
8182 /* Note: 's' is at the end of 'lo' */
8183 sector_t a
= BB_OFFSET(p
[hi
]);
8184 int lolen
= BB_LEN(p
[lo
]);
8185 int hilen
= BB_LEN(p
[hi
]);
8186 int newlen
= lolen
+ hilen
- (s
- a
);
8187 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8188 /* yes, we can combine them */
8189 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8190 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8191 memmove(p
+ hi
, p
+ hi
+ 1,
8192 (bb
->count
- hi
- 1) * 8);
8197 /* didn't merge (it all).
8198 * Need to add a range just before 'hi' */
8199 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8200 /* No room for more */
8204 int this_sectors
= sectors
;
8205 memmove(p
+ hi
+ 1, p
+ hi
,
8206 (bb
->count
- hi
) * 8);
8209 if (this_sectors
> BB_MAX_LEN
)
8210 this_sectors
= BB_MAX_LEN
;
8211 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8212 sectors
-= this_sectors
;
8219 bb
->unacked_exist
= 1;
8220 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8225 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8230 s
+= rdev
->new_data_offset
;
8232 s
+= rdev
->data_offset
;
8233 rv
= md_set_badblocks(&rdev
->badblocks
,
8236 /* Make sure they get written out promptly */
8237 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8238 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8239 md_wakeup_thread(rdev
->mddev
->thread
);
8243 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8246 * Remove a range of bad blocks from the table.
8247 * This may involve extending the table if we spilt a region,
8248 * but it must not fail. So if the table becomes full, we just
8249 * drop the remove request.
8251 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8255 sector_t target
= s
+ sectors
;
8258 if (bb
->shift
> 0) {
8259 /* When clearing we round the start up and the end down.
8260 * This should not matter as the shift should align with
8261 * the block size and no rounding should ever be needed.
8262 * However it is better the think a block is bad when it
8263 * isn't than to think a block is not bad when it is.
8265 s
+= (1<<bb
->shift
) - 1;
8267 target
>>= bb
->shift
;
8268 sectors
= target
- s
;
8271 write_seqlock_irq(&bb
->lock
);
8276 /* Find the last range that starts before 'target' */
8277 while (hi
- lo
> 1) {
8278 int mid
= (lo
+ hi
) / 2;
8279 sector_t a
= BB_OFFSET(p
[mid
]);
8286 /* p[lo] is the last range that could overlap the
8287 * current range. Earlier ranges could also overlap,
8288 * but only this one can overlap the end of the range.
8290 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8291 /* Partial overlap, leave the tail of this range */
8292 int ack
= BB_ACK(p
[lo
]);
8293 sector_t a
= BB_OFFSET(p
[lo
]);
8294 sector_t end
= a
+ BB_LEN(p
[lo
]);
8297 /* we need to split this range */
8298 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8302 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8304 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8307 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8308 /* there is no longer an overlap */
8313 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8314 /* This range does overlap */
8315 if (BB_OFFSET(p
[lo
]) < s
) {
8316 /* Keep the early parts of this range. */
8317 int ack
= BB_ACK(p
[lo
]);
8318 sector_t start
= BB_OFFSET(p
[lo
]);
8319 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8320 /* now low doesn't overlap, so.. */
8325 /* 'lo' is strictly before, 'hi' is strictly after,
8326 * anything between needs to be discarded
8329 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8330 bb
->count
-= (hi
- lo
- 1);
8336 write_sequnlock_irq(&bb
->lock
);
8340 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8344 s
+= rdev
->new_data_offset
;
8346 s
+= rdev
->data_offset
;
8347 return md_clear_badblocks(&rdev
->badblocks
,
8350 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8353 * Acknowledge all bad blocks in a list.
8354 * This only succeeds if ->changed is clear. It is used by
8355 * in-kernel metadata updates
8357 void md_ack_all_badblocks(struct badblocks
*bb
)
8359 if (bb
->page
== NULL
|| bb
->changed
)
8360 /* no point even trying */
8362 write_seqlock_irq(&bb
->lock
);
8364 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8367 for (i
= 0; i
< bb
->count
; i
++) {
8368 if (!BB_ACK(p
[i
])) {
8369 sector_t start
= BB_OFFSET(p
[i
]);
8370 int len
= BB_LEN(p
[i
]);
8371 p
[i
] = BB_MAKE(start
, len
, 1);
8374 bb
->unacked_exist
= 0;
8376 write_sequnlock_irq(&bb
->lock
);
8378 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8380 /* sysfs access to bad-blocks list.
8381 * We present two files.
8382 * 'bad-blocks' lists sector numbers and lengths of ranges that
8383 * are recorded as bad. The list is truncated to fit within
8384 * the one-page limit of sysfs.
8385 * Writing "sector length" to this file adds an acknowledged
8387 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8388 * been acknowledged. Writing to this file adds bad blocks
8389 * without acknowledging them. This is largely for testing.
8393 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8404 seq
= read_seqbegin(&bb
->lock
);
8409 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8410 sector_t s
= BB_OFFSET(p
[i
]);
8411 unsigned int length
= BB_LEN(p
[i
]);
8412 int ack
= BB_ACK(p
[i
]);
8418 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8419 (unsigned long long)s
<< bb
->shift
,
8420 length
<< bb
->shift
);
8422 if (unack
&& len
== 0)
8423 bb
->unacked_exist
= 0;
8425 if (read_seqretry(&bb
->lock
, seq
))
8434 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8436 unsigned long long sector
;
8440 /* Allow clearing via sysfs *only* for testing/debugging.
8441 * Normally only a successful write may clear a badblock
8444 if (page
[0] == '-') {
8448 #endif /* DO_DEBUG */
8450 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8452 if (newline
!= '\n')
8464 md_clear_badblocks(bb
, sector
, length
);
8467 #endif /* DO_DEBUG */
8468 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8474 static int md_notify_reboot(struct notifier_block
*this,
8475 unsigned long code
, void *x
)
8477 struct list_head
*tmp
;
8478 struct mddev
*mddev
;
8481 for_each_mddev(mddev
, tmp
) {
8482 if (mddev_trylock(mddev
)) {
8484 __md_stop_writes(mddev
);
8485 mddev
->safemode
= 2;
8486 mddev_unlock(mddev
);
8491 * certain more exotic SCSI devices are known to be
8492 * volatile wrt too early system reboots. While the
8493 * right place to handle this issue is the given
8494 * driver, we do want to have a safe RAID driver ...
8502 static struct notifier_block md_notifier
= {
8503 .notifier_call
= md_notify_reboot
,
8505 .priority
= INT_MAX
, /* before any real devices */
8508 static void md_geninit(void)
8510 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8512 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8515 static int __init
md_init(void)
8519 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8523 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8527 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8530 if ((ret
= register_blkdev(0, "mdp")) < 0)
8534 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8535 md_probe
, NULL
, NULL
);
8536 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8537 md_probe
, NULL
, NULL
);
8539 register_reboot_notifier(&md_notifier
);
8540 raid_table_header
= register_sysctl_table(raid_root_table
);
8546 unregister_blkdev(MD_MAJOR
, "md");
8548 destroy_workqueue(md_misc_wq
);
8550 destroy_workqueue(md_wq
);
8558 * Searches all registered partitions for autorun RAID arrays
8562 static LIST_HEAD(all_detected_devices
);
8563 struct detected_devices_node
{
8564 struct list_head list
;
8568 void md_autodetect_dev(dev_t dev
)
8570 struct detected_devices_node
*node_detected_dev
;
8572 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8573 if (node_detected_dev
) {
8574 node_detected_dev
->dev
= dev
;
8575 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8577 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8578 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8583 static void autostart_arrays(int part
)
8585 struct md_rdev
*rdev
;
8586 struct detected_devices_node
*node_detected_dev
;
8588 int i_scanned
, i_passed
;
8593 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8595 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8597 node_detected_dev
= list_entry(all_detected_devices
.next
,
8598 struct detected_devices_node
, list
);
8599 list_del(&node_detected_dev
->list
);
8600 dev
= node_detected_dev
->dev
;
8601 kfree(node_detected_dev
);
8602 rdev
= md_import_device(dev
,0, 90);
8606 if (test_bit(Faulty
, &rdev
->flags
)) {
8610 set_bit(AutoDetected
, &rdev
->flags
);
8611 list_add(&rdev
->same_set
, &pending_raid_disks
);
8615 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8616 i_scanned
, i_passed
);
8618 autorun_devices(part
);
8621 #endif /* !MODULE */
8623 static __exit
void md_exit(void)
8625 struct mddev
*mddev
;
8626 struct list_head
*tmp
;
8628 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8629 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8631 unregister_blkdev(MD_MAJOR
,"md");
8632 unregister_blkdev(mdp_major
, "mdp");
8633 unregister_reboot_notifier(&md_notifier
);
8634 unregister_sysctl_table(raid_table_header
);
8635 remove_proc_entry("mdstat", NULL
);
8636 for_each_mddev(mddev
, tmp
) {
8637 export_array(mddev
);
8638 mddev
->hold_active
= 0;
8640 destroy_workqueue(md_misc_wq
);
8641 destroy_workqueue(md_wq
);
8644 subsys_initcall(md_init
);
8645 module_exit(md_exit
)
8647 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8649 return sprintf(buffer
, "%d", start_readonly
);
8651 static int set_ro(const char *val
, struct kernel_param
*kp
)
8654 int num
= simple_strtoul(val
, &e
, 10);
8655 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8656 start_readonly
= num
;
8662 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8663 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8665 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8667 EXPORT_SYMBOL(register_md_personality
);
8668 EXPORT_SYMBOL(unregister_md_personality
);
8669 EXPORT_SYMBOL(md_error
);
8670 EXPORT_SYMBOL(md_done_sync
);
8671 EXPORT_SYMBOL(md_write_start
);
8672 EXPORT_SYMBOL(md_write_end
);
8673 EXPORT_SYMBOL(md_register_thread
);
8674 EXPORT_SYMBOL(md_unregister_thread
);
8675 EXPORT_SYMBOL(md_wakeup_thread
);
8676 EXPORT_SYMBOL(md_check_recovery
);
8677 EXPORT_SYMBOL(md_reap_sync_thread
);
8678 MODULE_LICENSE("GPL");
8679 MODULE_DESCRIPTION("MD RAID framework");
8681 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);