2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 static void autostart_arrays(int part
);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list
);
67 static DEFINE_SPINLOCK(pers_lock
);
69 static void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
72 static struct workqueue_struct
*md_wq
;
73 static struct workqueue_struct
*md_misc_wq
;
75 static int remove_and_add_spares(struct mddev
*mddev
,
76 struct md_rdev
*this);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min
= 1000;
100 static int sysctl_speed_limit_max
= 200000;
101 static inline int speed_min(struct mddev
*mddev
)
103 return mddev
->sync_speed_min
?
104 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
107 static inline int speed_max(struct mddev
*mddev
)
109 return mddev
->sync_speed_max
?
110 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
113 static struct ctl_table_header
*raid_table_header
;
115 static struct ctl_table raid_table
[] = {
117 .procname
= "speed_limit_min",
118 .data
= &sysctl_speed_limit_min
,
119 .maxlen
= sizeof(int),
120 .mode
= S_IRUGO
|S_IWUSR
,
121 .proc_handler
= proc_dointvec
,
124 .procname
= "speed_limit_max",
125 .data
= &sysctl_speed_limit_max
,
126 .maxlen
= sizeof(int),
127 .mode
= S_IRUGO
|S_IWUSR
,
128 .proc_handler
= proc_dointvec
,
133 static struct ctl_table raid_dir_table
[] = {
137 .mode
= S_IRUGO
|S_IXUGO
,
143 static struct ctl_table raid_root_table
[] = {
148 .child
= raid_dir_table
,
153 static const struct block_device_operations md_fops
;
155 static int start_readonly
;
158 * like bio_clone, but with a local bio set
161 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
166 if (!mddev
|| !mddev
->bio_set
)
167 return bio_alloc(gfp_mask
, nr_iovecs
);
169 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
174 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
176 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
179 if (!mddev
|| !mddev
->bio_set
)
180 return bio_clone(bio
, gfp_mask
);
182 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
184 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
187 * We have a system wide 'event count' that is incremented
188 * on any 'interesting' event, and readers of /proc/mdstat
189 * can use 'poll' or 'select' to find out when the event
193 * start array, stop array, error, add device, remove device,
194 * start build, activate spare
196 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
197 static atomic_t md_event_count
;
198 void md_new_event(struct mddev
*mddev
)
200 atomic_inc(&md_event_count
);
201 wake_up(&md_event_waiters
);
203 EXPORT_SYMBOL_GPL(md_new_event
);
205 /* Alternate version that can be called from interrupts
206 * when calling sysfs_notify isn't needed.
208 static void md_new_event_inintr(struct mddev
*mddev
)
210 atomic_inc(&md_event_count
);
211 wake_up(&md_event_waiters
);
215 * Enables to iterate over all existing md arrays
216 * all_mddevs_lock protects this list.
218 static LIST_HEAD(all_mddevs
);
219 static DEFINE_SPINLOCK(all_mddevs_lock
);
223 * iterates through all used mddevs in the system.
224 * We take care to grab the all_mddevs_lock whenever navigating
225 * the list, and to always hold a refcount when unlocked.
226 * Any code which breaks out of this loop while own
227 * a reference to the current mddev and must mddev_put it.
229 #define for_each_mddev(_mddev,_tmp) \
231 for (({ spin_lock(&all_mddevs_lock); \
232 _tmp = all_mddevs.next; \
234 ({ if (_tmp != &all_mddevs) \
235 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
236 spin_unlock(&all_mddevs_lock); \
237 if (_mddev) mddev_put(_mddev); \
238 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
239 _tmp != &all_mddevs;}); \
240 ({ spin_lock(&all_mddevs_lock); \
241 _tmp = _tmp->next;}) \
245 /* Rather than calling directly into the personality make_request function,
246 * IO requests come here first so that we can check if the device is
247 * being suspended pending a reconfiguration.
248 * We hold a refcount over the call to ->make_request. By the time that
249 * call has finished, the bio has been linked into some internal structure
250 * and so is visible to ->quiesce(), so we don't need the refcount any more.
252 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
254 const int rw
= bio_data_dir(bio
);
255 struct mddev
*mddev
= q
->queuedata
;
257 unsigned int sectors
;
259 if (mddev
== NULL
|| mddev
->pers
== NULL
264 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
265 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
268 smp_rmb(); /* Ensure implications of 'active' are visible */
270 if (mddev
->suspended
) {
273 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
274 TASK_UNINTERRUPTIBLE
);
275 if (!mddev
->suspended
)
281 finish_wait(&mddev
->sb_wait
, &__wait
);
283 atomic_inc(&mddev
->active_io
);
287 * save the sectors now since our bio can
288 * go away inside make_request
290 sectors
= bio_sectors(bio
);
291 mddev
->pers
->make_request(mddev
, bio
);
293 cpu
= part_stat_lock();
294 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
295 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
298 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
299 wake_up(&mddev
->sb_wait
);
302 /* mddev_suspend makes sure no new requests are submitted
303 * to the device, and that any requests that have been submitted
304 * are completely handled.
305 * Once ->stop is called and completes, the module will be completely
308 void mddev_suspend(struct mddev
*mddev
)
310 BUG_ON(mddev
->suspended
);
311 mddev
->suspended
= 1;
313 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
314 mddev
->pers
->quiesce(mddev
, 1);
316 del_timer_sync(&mddev
->safemode_timer
);
318 EXPORT_SYMBOL_GPL(mddev_suspend
);
320 void mddev_resume(struct mddev
*mddev
)
322 mddev
->suspended
= 0;
323 wake_up(&mddev
->sb_wait
);
324 mddev
->pers
->quiesce(mddev
, 0);
326 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
327 md_wakeup_thread(mddev
->thread
);
328 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
330 EXPORT_SYMBOL_GPL(mddev_resume
);
332 int mddev_congested(struct mddev
*mddev
, int bits
)
334 return mddev
->suspended
;
336 EXPORT_SYMBOL(mddev_congested
);
339 * Generic flush handling for md
342 static void md_end_flush(struct bio
*bio
, int err
)
344 struct md_rdev
*rdev
= bio
->bi_private
;
345 struct mddev
*mddev
= rdev
->mddev
;
347 rdev_dec_pending(rdev
, mddev
);
349 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
350 /* The pre-request flush has finished */
351 queue_work(md_wq
, &mddev
->flush_work
);
356 static void md_submit_flush_data(struct work_struct
*ws
);
358 static void submit_flushes(struct work_struct
*ws
)
360 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
361 struct md_rdev
*rdev
;
363 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
364 atomic_set(&mddev
->flush_pending
, 1);
366 rdev_for_each_rcu(rdev
, mddev
)
367 if (rdev
->raid_disk
>= 0 &&
368 !test_bit(Faulty
, &rdev
->flags
)) {
369 /* Take two references, one is dropped
370 * when request finishes, one after
371 * we reclaim rcu_read_lock
374 atomic_inc(&rdev
->nr_pending
);
375 atomic_inc(&rdev
->nr_pending
);
377 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
378 bi
->bi_end_io
= md_end_flush
;
379 bi
->bi_private
= rdev
;
380 bi
->bi_bdev
= rdev
->bdev
;
381 atomic_inc(&mddev
->flush_pending
);
382 submit_bio(WRITE_FLUSH
, bi
);
384 rdev_dec_pending(rdev
, mddev
);
387 if (atomic_dec_and_test(&mddev
->flush_pending
))
388 queue_work(md_wq
, &mddev
->flush_work
);
391 static void md_submit_flush_data(struct work_struct
*ws
)
393 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
394 struct bio
*bio
= mddev
->flush_bio
;
396 if (bio
->bi_size
== 0)
397 /* an empty barrier - all done */
400 bio
->bi_rw
&= ~REQ_FLUSH
;
401 mddev
->pers
->make_request(mddev
, bio
);
404 mddev
->flush_bio
= NULL
;
405 wake_up(&mddev
->sb_wait
);
408 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
410 spin_lock_irq(&mddev
->write_lock
);
411 wait_event_lock_irq(mddev
->sb_wait
,
414 mddev
->flush_bio
= bio
;
415 spin_unlock_irq(&mddev
->write_lock
);
417 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
418 queue_work(md_wq
, &mddev
->flush_work
);
420 EXPORT_SYMBOL(md_flush_request
);
422 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
424 struct mddev
*mddev
= cb
->data
;
425 md_wakeup_thread(mddev
->thread
);
428 EXPORT_SYMBOL(md_unplug
);
430 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
432 atomic_inc(&mddev
->active
);
436 static void mddev_delayed_delete(struct work_struct
*ws
);
438 static void mddev_put(struct mddev
*mddev
)
440 struct bio_set
*bs
= NULL
;
442 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
444 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
445 mddev
->ctime
== 0 && !mddev
->hold_active
) {
446 /* Array is not configured at all, and not held active,
448 list_del_init(&mddev
->all_mddevs
);
450 mddev
->bio_set
= NULL
;
451 if (mddev
->gendisk
) {
452 /* We did a probe so need to clean up. Call
453 * queue_work inside the spinlock so that
454 * flush_workqueue() after mddev_find will
455 * succeed in waiting for the work to be done.
457 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
458 queue_work(md_misc_wq
, &mddev
->del_work
);
462 spin_unlock(&all_mddevs_lock
);
467 void mddev_init(struct mddev
*mddev
)
469 mutex_init(&mddev
->open_mutex
);
470 mutex_init(&mddev
->reconfig_mutex
);
471 mutex_init(&mddev
->bitmap_info
.mutex
);
472 INIT_LIST_HEAD(&mddev
->disks
);
473 INIT_LIST_HEAD(&mddev
->all_mddevs
);
474 init_timer(&mddev
->safemode_timer
);
475 atomic_set(&mddev
->active
, 1);
476 atomic_set(&mddev
->openers
, 0);
477 atomic_set(&mddev
->active_io
, 0);
478 spin_lock_init(&mddev
->write_lock
);
479 atomic_set(&mddev
->flush_pending
, 0);
480 init_waitqueue_head(&mddev
->sb_wait
);
481 init_waitqueue_head(&mddev
->recovery_wait
);
482 mddev
->reshape_position
= MaxSector
;
483 mddev
->reshape_backwards
= 0;
484 mddev
->last_sync_action
= "none";
485 mddev
->resync_min
= 0;
486 mddev
->resync_max
= MaxSector
;
487 mddev
->level
= LEVEL_NONE
;
489 EXPORT_SYMBOL_GPL(mddev_init
);
491 static struct mddev
* mddev_find(dev_t unit
)
493 struct mddev
*mddev
, *new = NULL
;
495 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
496 unit
&= ~((1<<MdpMinorShift
)-1);
499 spin_lock(&all_mddevs_lock
);
502 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
503 if (mddev
->unit
== unit
) {
505 spin_unlock(&all_mddevs_lock
);
511 list_add(&new->all_mddevs
, &all_mddevs
);
512 spin_unlock(&all_mddevs_lock
);
513 new->hold_active
= UNTIL_IOCTL
;
517 /* find an unused unit number */
518 static int next_minor
= 512;
519 int start
= next_minor
;
523 dev
= MKDEV(MD_MAJOR
, next_minor
);
525 if (next_minor
> MINORMASK
)
527 if (next_minor
== start
) {
528 /* Oh dear, all in use. */
529 spin_unlock(&all_mddevs_lock
);
535 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
536 if (mddev
->unit
== dev
) {
542 new->md_minor
= MINOR(dev
);
543 new->hold_active
= UNTIL_STOP
;
544 list_add(&new->all_mddevs
, &all_mddevs
);
545 spin_unlock(&all_mddevs_lock
);
548 spin_unlock(&all_mddevs_lock
);
550 new = kzalloc(sizeof(*new), GFP_KERNEL
);
555 if (MAJOR(unit
) == MD_MAJOR
)
556 new->md_minor
= MINOR(unit
);
558 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
565 static inline int __must_check
mddev_lock(struct mddev
* mddev
)
567 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
570 /* Sometimes we need to take the lock in a situation where
571 * failure due to interrupts is not acceptable.
573 static inline void mddev_lock_nointr(struct mddev
* mddev
)
575 mutex_lock(&mddev
->reconfig_mutex
);
578 static inline int mddev_is_locked(struct mddev
*mddev
)
580 return mutex_is_locked(&mddev
->reconfig_mutex
);
583 static inline int mddev_trylock(struct mddev
* mddev
)
585 return mutex_trylock(&mddev
->reconfig_mutex
);
588 static struct attribute_group md_redundancy_group
;
590 static void mddev_unlock(struct mddev
* mddev
)
592 if (mddev
->to_remove
) {
593 /* These cannot be removed under reconfig_mutex as
594 * an access to the files will try to take reconfig_mutex
595 * while holding the file unremovable, which leads to
597 * So hold set sysfs_active while the remove in happeing,
598 * and anything else which might set ->to_remove or my
599 * otherwise change the sysfs namespace will fail with
600 * -EBUSY if sysfs_active is still set.
601 * We set sysfs_active under reconfig_mutex and elsewhere
602 * test it under the same mutex to ensure its correct value
605 struct attribute_group
*to_remove
= mddev
->to_remove
;
606 mddev
->to_remove
= NULL
;
607 mddev
->sysfs_active
= 1;
608 mutex_unlock(&mddev
->reconfig_mutex
);
610 if (mddev
->kobj
.sd
) {
611 if (to_remove
!= &md_redundancy_group
)
612 sysfs_remove_group(&mddev
->kobj
, to_remove
);
613 if (mddev
->pers
== NULL
||
614 mddev
->pers
->sync_request
== NULL
) {
615 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
616 if (mddev
->sysfs_action
)
617 sysfs_put(mddev
->sysfs_action
);
618 mddev
->sysfs_action
= NULL
;
621 mddev
->sysfs_active
= 0;
623 mutex_unlock(&mddev
->reconfig_mutex
);
625 /* As we've dropped the mutex we need a spinlock to
626 * make sure the thread doesn't disappear
628 spin_lock(&pers_lock
);
629 md_wakeup_thread(mddev
->thread
);
630 spin_unlock(&pers_lock
);
633 static struct md_rdev
* find_rdev_nr(struct mddev
*mddev
, int nr
)
635 struct md_rdev
*rdev
;
637 rdev_for_each(rdev
, mddev
)
638 if (rdev
->desc_nr
== nr
)
644 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
646 struct md_rdev
*rdev
;
648 rdev_for_each_rcu(rdev
, mddev
)
649 if (rdev
->desc_nr
== nr
)
655 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
657 struct md_rdev
*rdev
;
659 rdev_for_each(rdev
, mddev
)
660 if (rdev
->bdev
->bd_dev
== dev
)
666 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
668 struct md_rdev
*rdev
;
670 rdev_for_each_rcu(rdev
, mddev
)
671 if (rdev
->bdev
->bd_dev
== dev
)
677 static struct md_personality
*find_pers(int level
, char *clevel
)
679 struct md_personality
*pers
;
680 list_for_each_entry(pers
, &pers_list
, list
) {
681 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
683 if (strcmp(pers
->name
, clevel
)==0)
689 /* return the offset of the super block in 512byte sectors */
690 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
692 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
693 return MD_NEW_SIZE_SECTORS(num_sectors
);
696 static int alloc_disk_sb(struct md_rdev
* rdev
)
701 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
702 if (!rdev
->sb_page
) {
703 printk(KERN_ALERT
"md: out of memory.\n");
710 void md_rdev_clear(struct md_rdev
*rdev
)
713 put_page(rdev
->sb_page
);
715 rdev
->sb_page
= NULL
;
720 put_page(rdev
->bb_page
);
721 rdev
->bb_page
= NULL
;
723 kfree(rdev
->badblocks
.page
);
724 rdev
->badblocks
.page
= NULL
;
726 EXPORT_SYMBOL_GPL(md_rdev_clear
);
728 static void super_written(struct bio
*bio
, int error
)
730 struct md_rdev
*rdev
= bio
->bi_private
;
731 struct mddev
*mddev
= rdev
->mddev
;
733 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
734 printk("md: super_written gets error=%d, uptodate=%d\n",
735 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
736 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
737 md_error(mddev
, rdev
);
740 if (atomic_dec_and_test(&mddev
->pending_writes
))
741 wake_up(&mddev
->sb_wait
);
745 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
746 sector_t sector
, int size
, struct page
*page
)
748 /* write first size bytes of page to sector of rdev
749 * Increment mddev->pending_writes before returning
750 * and decrement it on completion, waking up sb_wait
751 * if zero is reached.
752 * If an error occurred, call md_error
754 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
756 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
757 bio
->bi_sector
= sector
;
758 bio_add_page(bio
, page
, size
, 0);
759 bio
->bi_private
= rdev
;
760 bio
->bi_end_io
= super_written
;
762 atomic_inc(&mddev
->pending_writes
);
763 submit_bio(WRITE_FLUSH_FUA
, bio
);
766 void md_super_wait(struct mddev
*mddev
)
768 /* wait for all superblock writes that were scheduled to complete */
771 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
772 if (atomic_read(&mddev
->pending_writes
)==0)
776 finish_wait(&mddev
->sb_wait
, &wq
);
779 static void bi_complete(struct bio
*bio
, int error
)
781 complete((struct completion
*)bio
->bi_private
);
784 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
785 struct page
*page
, int rw
, bool metadata_op
)
787 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
788 struct completion event
;
793 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
794 rdev
->meta_bdev
: rdev
->bdev
;
796 bio
->bi_sector
= sector
+ rdev
->sb_start
;
797 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
798 (rdev
->mddev
->reshape_backwards
==
799 (sector
>= rdev
->mddev
->reshape_position
)))
800 bio
->bi_sector
= sector
+ rdev
->new_data_offset
;
802 bio
->bi_sector
= sector
+ rdev
->data_offset
;
803 bio_add_page(bio
, page
, size
, 0);
804 init_completion(&event
);
805 bio
->bi_private
= &event
;
806 bio
->bi_end_io
= bi_complete
;
808 wait_for_completion(&event
);
810 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
814 EXPORT_SYMBOL_GPL(sync_page_io
);
816 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
818 char b
[BDEVNAME_SIZE
];
819 if (!rdev
->sb_page
) {
827 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
833 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
834 bdevname(rdev
->bdev
,b
));
838 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
840 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
841 sb1
->set_uuid1
== sb2
->set_uuid1
&&
842 sb1
->set_uuid2
== sb2
->set_uuid2
&&
843 sb1
->set_uuid3
== sb2
->set_uuid3
;
846 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
849 mdp_super_t
*tmp1
, *tmp2
;
851 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
852 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
854 if (!tmp1
|| !tmp2
) {
856 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
864 * nr_disks is not constant
869 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
877 static u32
md_csum_fold(u32 csum
)
879 csum
= (csum
& 0xffff) + (csum
>> 16);
880 return (csum
& 0xffff) + (csum
>> 16);
883 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
886 u32
*sb32
= (u32
*)sb
;
888 unsigned int disk_csum
, csum
;
890 disk_csum
= sb
->sb_csum
;
893 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
895 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
899 /* This used to use csum_partial, which was wrong for several
900 * reasons including that different results are returned on
901 * different architectures. It isn't critical that we get exactly
902 * the same return value as before (we always csum_fold before
903 * testing, and that removes any differences). However as we
904 * know that csum_partial always returned a 16bit value on
905 * alphas, do a fold to maximise conformity to previous behaviour.
907 sb
->sb_csum
= md_csum_fold(disk_csum
);
909 sb
->sb_csum
= disk_csum
;
916 * Handle superblock details.
917 * We want to be able to handle multiple superblock formats
918 * so we have a common interface to them all, and an array of
919 * different handlers.
920 * We rely on user-space to write the initial superblock, and support
921 * reading and updating of superblocks.
922 * Interface methods are:
923 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
924 * loads and validates a superblock on dev.
925 * if refdev != NULL, compare superblocks on both devices
927 * 0 - dev has a superblock that is compatible with refdev
928 * 1 - dev has a superblock that is compatible and newer than refdev
929 * so dev should be used as the refdev in future
930 * -EINVAL superblock incompatible or invalid
931 * -othererror e.g. -EIO
933 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
934 * Verify that dev is acceptable into mddev.
935 * The first time, mddev->raid_disks will be 0, and data from
936 * dev should be merged in. Subsequent calls check that dev
937 * is new enough. Return 0 or -EINVAL
939 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
940 * Update the superblock for rdev with data in mddev
941 * This does not write to disc.
947 struct module
*owner
;
948 int (*load_super
)(struct md_rdev
*rdev
,
949 struct md_rdev
*refdev
,
951 int (*validate_super
)(struct mddev
*mddev
,
952 struct md_rdev
*rdev
);
953 void (*sync_super
)(struct mddev
*mddev
,
954 struct md_rdev
*rdev
);
955 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
956 sector_t num_sectors
);
957 int (*allow_new_offset
)(struct md_rdev
*rdev
,
958 unsigned long long new_offset
);
962 * Check that the given mddev has no bitmap.
964 * This function is called from the run method of all personalities that do not
965 * support bitmaps. It prints an error message and returns non-zero if mddev
966 * has a bitmap. Otherwise, it returns 0.
969 int md_check_no_bitmap(struct mddev
*mddev
)
971 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
973 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
974 mdname(mddev
), mddev
->pers
->name
);
977 EXPORT_SYMBOL(md_check_no_bitmap
);
980 * load_super for 0.90.0
982 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
984 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
989 * Calculate the position of the superblock (512byte sectors),
990 * it's at the end of the disk.
992 * It also happens to be a multiple of 4Kb.
994 rdev
->sb_start
= calc_dev_sboffset(rdev
);
996 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1001 bdevname(rdev
->bdev
, b
);
1002 sb
= page_address(rdev
->sb_page
);
1004 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1005 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1010 if (sb
->major_version
!= 0 ||
1011 sb
->minor_version
< 90 ||
1012 sb
->minor_version
> 91) {
1013 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1014 sb
->major_version
, sb
->minor_version
,
1019 if (sb
->raid_disks
<= 0)
1022 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1023 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1028 rdev
->preferred_minor
= sb
->md_minor
;
1029 rdev
->data_offset
= 0;
1030 rdev
->new_data_offset
= 0;
1031 rdev
->sb_size
= MD_SB_BYTES
;
1032 rdev
->badblocks
.shift
= -1;
1034 if (sb
->level
== LEVEL_MULTIPATH
)
1037 rdev
->desc_nr
= sb
->this_disk
.number
;
1043 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1044 if (!uuid_equal(refsb
, sb
)) {
1045 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1046 b
, bdevname(refdev
->bdev
,b2
));
1049 if (!sb_equal(refsb
, sb
)) {
1050 printk(KERN_WARNING
"md: %s has same UUID"
1051 " but different superblock to %s\n",
1052 b
, bdevname(refdev
->bdev
, b2
));
1056 ev2
= md_event(refsb
);
1062 rdev
->sectors
= rdev
->sb_start
;
1063 /* Limit to 4TB as metadata cannot record more than that.
1064 * (not needed for Linear and RAID0 as metadata doesn't
1067 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1068 rdev
->sectors
= (2ULL << 32) - 2;
1070 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1071 /* "this cannot possibly happen" ... */
1079 * validate_super for 0.90.0
1081 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1084 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1085 __u64 ev1
= md_event(sb
);
1087 rdev
->raid_disk
= -1;
1088 clear_bit(Faulty
, &rdev
->flags
);
1089 clear_bit(In_sync
, &rdev
->flags
);
1090 clear_bit(WriteMostly
, &rdev
->flags
);
1092 if (mddev
->raid_disks
== 0) {
1093 mddev
->major_version
= 0;
1094 mddev
->minor_version
= sb
->minor_version
;
1095 mddev
->patch_version
= sb
->patch_version
;
1096 mddev
->external
= 0;
1097 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1098 mddev
->ctime
= sb
->ctime
;
1099 mddev
->utime
= sb
->utime
;
1100 mddev
->level
= sb
->level
;
1101 mddev
->clevel
[0] = 0;
1102 mddev
->layout
= sb
->layout
;
1103 mddev
->raid_disks
= sb
->raid_disks
;
1104 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1105 mddev
->events
= ev1
;
1106 mddev
->bitmap_info
.offset
= 0;
1107 mddev
->bitmap_info
.space
= 0;
1108 /* bitmap can use 60 K after the 4K superblocks */
1109 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1110 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1111 mddev
->reshape_backwards
= 0;
1113 if (mddev
->minor_version
>= 91) {
1114 mddev
->reshape_position
= sb
->reshape_position
;
1115 mddev
->delta_disks
= sb
->delta_disks
;
1116 mddev
->new_level
= sb
->new_level
;
1117 mddev
->new_layout
= sb
->new_layout
;
1118 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1119 if (mddev
->delta_disks
< 0)
1120 mddev
->reshape_backwards
= 1;
1122 mddev
->reshape_position
= MaxSector
;
1123 mddev
->delta_disks
= 0;
1124 mddev
->new_level
= mddev
->level
;
1125 mddev
->new_layout
= mddev
->layout
;
1126 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1129 if (sb
->state
& (1<<MD_SB_CLEAN
))
1130 mddev
->recovery_cp
= MaxSector
;
1132 if (sb
->events_hi
== sb
->cp_events_hi
&&
1133 sb
->events_lo
== sb
->cp_events_lo
) {
1134 mddev
->recovery_cp
= sb
->recovery_cp
;
1136 mddev
->recovery_cp
= 0;
1139 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1140 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1141 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1142 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1144 mddev
->max_disks
= MD_SB_DISKS
;
1146 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1147 mddev
->bitmap_info
.file
== NULL
) {
1148 mddev
->bitmap_info
.offset
=
1149 mddev
->bitmap_info
.default_offset
;
1150 mddev
->bitmap_info
.space
=
1151 mddev
->bitmap_info
.default_space
;
1154 } else if (mddev
->pers
== NULL
) {
1155 /* Insist on good event counter while assembling, except
1156 * for spares (which don't need an event count) */
1158 if (sb
->disks
[rdev
->desc_nr
].state
& (
1159 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1160 if (ev1
< mddev
->events
)
1162 } else if (mddev
->bitmap
) {
1163 /* if adding to array with a bitmap, then we can accept an
1164 * older device ... but not too old.
1166 if (ev1
< mddev
->bitmap
->events_cleared
)
1169 if (ev1
< mddev
->events
)
1170 /* just a hot-add of a new device, leave raid_disk at -1 */
1174 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1175 desc
= sb
->disks
+ rdev
->desc_nr
;
1177 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1178 set_bit(Faulty
, &rdev
->flags
);
1179 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1180 desc->raid_disk < mddev->raid_disks */) {
1181 set_bit(In_sync
, &rdev
->flags
);
1182 rdev
->raid_disk
= desc
->raid_disk
;
1183 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1184 /* active but not in sync implies recovery up to
1185 * reshape position. We don't know exactly where
1186 * that is, so set to zero for now */
1187 if (mddev
->minor_version
>= 91) {
1188 rdev
->recovery_offset
= 0;
1189 rdev
->raid_disk
= desc
->raid_disk
;
1192 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1193 set_bit(WriteMostly
, &rdev
->flags
);
1194 } else /* MULTIPATH are always insync */
1195 set_bit(In_sync
, &rdev
->flags
);
1200 * sync_super for 0.90.0
1202 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1205 struct md_rdev
*rdev2
;
1206 int next_spare
= mddev
->raid_disks
;
1209 /* make rdev->sb match mddev data..
1212 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1213 * 3/ any empty disks < next_spare become removed
1215 * disks[0] gets initialised to REMOVED because
1216 * we cannot be sure from other fields if it has
1217 * been initialised or not.
1220 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1222 rdev
->sb_size
= MD_SB_BYTES
;
1224 sb
= page_address(rdev
->sb_page
);
1226 memset(sb
, 0, sizeof(*sb
));
1228 sb
->md_magic
= MD_SB_MAGIC
;
1229 sb
->major_version
= mddev
->major_version
;
1230 sb
->patch_version
= mddev
->patch_version
;
1231 sb
->gvalid_words
= 0; /* ignored */
1232 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1233 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1234 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1235 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1237 sb
->ctime
= mddev
->ctime
;
1238 sb
->level
= mddev
->level
;
1239 sb
->size
= mddev
->dev_sectors
/ 2;
1240 sb
->raid_disks
= mddev
->raid_disks
;
1241 sb
->md_minor
= mddev
->md_minor
;
1242 sb
->not_persistent
= 0;
1243 sb
->utime
= mddev
->utime
;
1245 sb
->events_hi
= (mddev
->events
>>32);
1246 sb
->events_lo
= (u32
)mddev
->events
;
1248 if (mddev
->reshape_position
== MaxSector
)
1249 sb
->minor_version
= 90;
1251 sb
->minor_version
= 91;
1252 sb
->reshape_position
= mddev
->reshape_position
;
1253 sb
->new_level
= mddev
->new_level
;
1254 sb
->delta_disks
= mddev
->delta_disks
;
1255 sb
->new_layout
= mddev
->new_layout
;
1256 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1258 mddev
->minor_version
= sb
->minor_version
;
1261 sb
->recovery_cp
= mddev
->recovery_cp
;
1262 sb
->cp_events_hi
= (mddev
->events
>>32);
1263 sb
->cp_events_lo
= (u32
)mddev
->events
;
1264 if (mddev
->recovery_cp
== MaxSector
)
1265 sb
->state
= (1<< MD_SB_CLEAN
);
1267 sb
->recovery_cp
= 0;
1269 sb
->layout
= mddev
->layout
;
1270 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1272 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1273 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1275 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1276 rdev_for_each(rdev2
, mddev
) {
1279 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1281 if (rdev2
->raid_disk
>= 0 &&
1282 sb
->minor_version
>= 91)
1283 /* we have nowhere to store the recovery_offset,
1284 * but if it is not below the reshape_position,
1285 * we can piggy-back on that.
1288 if (rdev2
->raid_disk
< 0 ||
1289 test_bit(Faulty
, &rdev2
->flags
))
1292 desc_nr
= rdev2
->raid_disk
;
1294 desc_nr
= next_spare
++;
1295 rdev2
->desc_nr
= desc_nr
;
1296 d
= &sb
->disks
[rdev2
->desc_nr
];
1298 d
->number
= rdev2
->desc_nr
;
1299 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1300 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1302 d
->raid_disk
= rdev2
->raid_disk
;
1304 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1305 if (test_bit(Faulty
, &rdev2
->flags
))
1306 d
->state
= (1<<MD_DISK_FAULTY
);
1307 else if (is_active
) {
1308 d
->state
= (1<<MD_DISK_ACTIVE
);
1309 if (test_bit(In_sync
, &rdev2
->flags
))
1310 d
->state
|= (1<<MD_DISK_SYNC
);
1318 if (test_bit(WriteMostly
, &rdev2
->flags
))
1319 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1321 /* now set the "removed" and "faulty" bits on any missing devices */
1322 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1323 mdp_disk_t
*d
= &sb
->disks
[i
];
1324 if (d
->state
== 0 && d
->number
== 0) {
1327 d
->state
= (1<<MD_DISK_REMOVED
);
1328 d
->state
|= (1<<MD_DISK_FAULTY
);
1332 sb
->nr_disks
= nr_disks
;
1333 sb
->active_disks
= active
;
1334 sb
->working_disks
= working
;
1335 sb
->failed_disks
= failed
;
1336 sb
->spare_disks
= spare
;
1338 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1339 sb
->sb_csum
= calc_sb_csum(sb
);
1343 * rdev_size_change for 0.90.0
1345 static unsigned long long
1346 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1348 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1349 return 0; /* component must fit device */
1350 if (rdev
->mddev
->bitmap_info
.offset
)
1351 return 0; /* can't move bitmap */
1352 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1353 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1354 num_sectors
= rdev
->sb_start
;
1355 /* Limit to 4TB as metadata cannot record more than that.
1356 * 4TB == 2^32 KB, or 2*2^32 sectors.
1358 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1359 num_sectors
= (2ULL << 32) - 2;
1360 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1362 md_super_wait(rdev
->mddev
);
1367 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1369 /* non-zero offset changes not possible with v0.90 */
1370 return new_offset
== 0;
1374 * version 1 superblock
1377 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1381 unsigned long long newcsum
;
1382 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1383 __le32
*isuper
= (__le32
*)sb
;
1385 disk_csum
= sb
->sb_csum
;
1388 for (; size
>= 4; size
-= 4)
1389 newcsum
+= le32_to_cpu(*isuper
++);
1392 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1394 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1395 sb
->sb_csum
= disk_csum
;
1396 return cpu_to_le32(csum
);
1399 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1401 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1403 struct mdp_superblock_1
*sb
;
1407 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1411 * Calculate the position of the superblock in 512byte sectors.
1412 * It is always aligned to a 4K boundary and
1413 * depeding on minor_version, it can be:
1414 * 0: At least 8K, but less than 12K, from end of device
1415 * 1: At start of device
1416 * 2: 4K from start of device.
1418 switch(minor_version
) {
1420 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1422 sb_start
&= ~(sector_t
)(4*2-1);
1433 rdev
->sb_start
= sb_start
;
1435 /* superblock is rarely larger than 1K, but it can be larger,
1436 * and it is safe to read 4k, so we do that
1438 ret
= read_disk_sb(rdev
, 4096);
1439 if (ret
) return ret
;
1442 sb
= page_address(rdev
->sb_page
);
1444 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1445 sb
->major_version
!= cpu_to_le32(1) ||
1446 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1447 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1448 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1451 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1452 printk("md: invalid superblock checksum on %s\n",
1453 bdevname(rdev
->bdev
,b
));
1456 if (le64_to_cpu(sb
->data_size
) < 10) {
1457 printk("md: data_size too small on %s\n",
1458 bdevname(rdev
->bdev
,b
));
1463 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1464 /* Some padding is non-zero, might be a new feature */
1467 rdev
->preferred_minor
= 0xffff;
1468 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1469 rdev
->new_data_offset
= rdev
->data_offset
;
1470 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1471 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1472 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1473 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1475 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1476 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1477 if (rdev
->sb_size
& bmask
)
1478 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1481 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1484 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1487 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1490 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1492 if (!rdev
->bb_page
) {
1493 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1497 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1498 rdev
->badblocks
.count
== 0) {
1499 /* need to load the bad block list.
1500 * Currently we limit it to one page.
1506 int sectors
= le16_to_cpu(sb
->bblog_size
);
1507 if (sectors
> (PAGE_SIZE
/ 512))
1509 offset
= le32_to_cpu(sb
->bblog_offset
);
1512 bb_sector
= (long long)offset
;
1513 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1514 rdev
->bb_page
, READ
, true))
1516 bbp
= (u64
*)page_address(rdev
->bb_page
);
1517 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1518 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1519 u64 bb
= le64_to_cpu(*bbp
);
1520 int count
= bb
& (0x3ff);
1521 u64 sector
= bb
>> 10;
1522 sector
<<= sb
->bblog_shift
;
1523 count
<<= sb
->bblog_shift
;
1526 if (md_set_badblocks(&rdev
->badblocks
,
1527 sector
, count
, 1) == 0)
1530 } else if (sb
->bblog_offset
!= 0)
1531 rdev
->badblocks
.shift
= 0;
1537 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1539 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1540 sb
->level
!= refsb
->level
||
1541 sb
->layout
!= refsb
->layout
||
1542 sb
->chunksize
!= refsb
->chunksize
) {
1543 printk(KERN_WARNING
"md: %s has strangely different"
1544 " superblock to %s\n",
1545 bdevname(rdev
->bdev
,b
),
1546 bdevname(refdev
->bdev
,b2
));
1549 ev1
= le64_to_cpu(sb
->events
);
1550 ev2
= le64_to_cpu(refsb
->events
);
1557 if (minor_version
) {
1558 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1559 sectors
-= rdev
->data_offset
;
1561 sectors
= rdev
->sb_start
;
1562 if (sectors
< le64_to_cpu(sb
->data_size
))
1564 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1568 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1570 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1571 __u64 ev1
= le64_to_cpu(sb
->events
);
1573 rdev
->raid_disk
= -1;
1574 clear_bit(Faulty
, &rdev
->flags
);
1575 clear_bit(In_sync
, &rdev
->flags
);
1576 clear_bit(WriteMostly
, &rdev
->flags
);
1578 if (mddev
->raid_disks
== 0) {
1579 mddev
->major_version
= 1;
1580 mddev
->patch_version
= 0;
1581 mddev
->external
= 0;
1582 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1583 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1584 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1585 mddev
->level
= le32_to_cpu(sb
->level
);
1586 mddev
->clevel
[0] = 0;
1587 mddev
->layout
= le32_to_cpu(sb
->layout
);
1588 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1589 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1590 mddev
->events
= ev1
;
1591 mddev
->bitmap_info
.offset
= 0;
1592 mddev
->bitmap_info
.space
= 0;
1593 /* Default location for bitmap is 1K after superblock
1594 * using 3K - total of 4K
1596 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1597 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1598 mddev
->reshape_backwards
= 0;
1600 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1601 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1603 mddev
->max_disks
= (4096-256)/2;
1605 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1606 mddev
->bitmap_info
.file
== NULL
) {
1607 mddev
->bitmap_info
.offset
=
1608 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1609 /* Metadata doesn't record how much space is available.
1610 * For 1.0, we assume we can use up to the superblock
1611 * if before, else to 4K beyond superblock.
1612 * For others, assume no change is possible.
1614 if (mddev
->minor_version
> 0)
1615 mddev
->bitmap_info
.space
= 0;
1616 else if (mddev
->bitmap_info
.offset
> 0)
1617 mddev
->bitmap_info
.space
=
1618 8 - mddev
->bitmap_info
.offset
;
1620 mddev
->bitmap_info
.space
=
1621 -mddev
->bitmap_info
.offset
;
1624 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1625 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1626 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1627 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1628 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1629 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1630 if (mddev
->delta_disks
< 0 ||
1631 (mddev
->delta_disks
== 0 &&
1632 (le32_to_cpu(sb
->feature_map
)
1633 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1634 mddev
->reshape_backwards
= 1;
1636 mddev
->reshape_position
= MaxSector
;
1637 mddev
->delta_disks
= 0;
1638 mddev
->new_level
= mddev
->level
;
1639 mddev
->new_layout
= mddev
->layout
;
1640 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1643 } else if (mddev
->pers
== NULL
) {
1644 /* Insist of good event counter while assembling, except for
1645 * spares (which don't need an event count) */
1647 if (rdev
->desc_nr
>= 0 &&
1648 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1649 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1650 if (ev1
< mddev
->events
)
1652 } else if (mddev
->bitmap
) {
1653 /* If adding to array with a bitmap, then we can accept an
1654 * older device, but not too old.
1656 if (ev1
< mddev
->bitmap
->events_cleared
)
1659 if (ev1
< mddev
->events
)
1660 /* just a hot-add of a new device, leave raid_disk at -1 */
1663 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1665 if (rdev
->desc_nr
< 0 ||
1666 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1670 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1672 case 0xffff: /* spare */
1674 case 0xfffe: /* faulty */
1675 set_bit(Faulty
, &rdev
->flags
);
1678 if ((le32_to_cpu(sb
->feature_map
) &
1679 MD_FEATURE_RECOVERY_OFFSET
))
1680 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1682 set_bit(In_sync
, &rdev
->flags
);
1683 rdev
->raid_disk
= role
;
1686 if (sb
->devflags
& WriteMostly1
)
1687 set_bit(WriteMostly
, &rdev
->flags
);
1688 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1689 set_bit(Replacement
, &rdev
->flags
);
1690 } else /* MULTIPATH are always insync */
1691 set_bit(In_sync
, &rdev
->flags
);
1696 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1698 struct mdp_superblock_1
*sb
;
1699 struct md_rdev
*rdev2
;
1701 /* make rdev->sb match mddev and rdev data. */
1703 sb
= page_address(rdev
->sb_page
);
1705 sb
->feature_map
= 0;
1707 sb
->recovery_offset
= cpu_to_le64(0);
1708 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1710 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1711 sb
->events
= cpu_to_le64(mddev
->events
);
1713 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1715 sb
->resync_offset
= cpu_to_le64(0);
1717 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1719 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1720 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1721 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1722 sb
->level
= cpu_to_le32(mddev
->level
);
1723 sb
->layout
= cpu_to_le32(mddev
->layout
);
1725 if (test_bit(WriteMostly
, &rdev
->flags
))
1726 sb
->devflags
|= WriteMostly1
;
1728 sb
->devflags
&= ~WriteMostly1
;
1729 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1730 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1732 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1733 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1734 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1737 if (rdev
->raid_disk
>= 0 &&
1738 !test_bit(In_sync
, &rdev
->flags
)) {
1740 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1741 sb
->recovery_offset
=
1742 cpu_to_le64(rdev
->recovery_offset
);
1744 if (test_bit(Replacement
, &rdev
->flags
))
1746 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1748 if (mddev
->reshape_position
!= MaxSector
) {
1749 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1750 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1751 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1752 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1753 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1754 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1755 if (mddev
->delta_disks
== 0 &&
1756 mddev
->reshape_backwards
)
1758 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1759 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1761 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1762 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1763 - rdev
->data_offset
));
1767 if (rdev
->badblocks
.count
== 0)
1768 /* Nothing to do for bad blocks*/ ;
1769 else if (sb
->bblog_offset
== 0)
1770 /* Cannot record bad blocks on this device */
1771 md_error(mddev
, rdev
);
1773 struct badblocks
*bb
= &rdev
->badblocks
;
1774 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1776 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1781 seq
= read_seqbegin(&bb
->lock
);
1783 memset(bbp
, 0xff, PAGE_SIZE
);
1785 for (i
= 0 ; i
< bb
->count
; i
++) {
1786 u64 internal_bb
= p
[i
];
1787 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1788 | BB_LEN(internal_bb
));
1789 bbp
[i
] = cpu_to_le64(store_bb
);
1792 if (read_seqretry(&bb
->lock
, seq
))
1795 bb
->sector
= (rdev
->sb_start
+
1796 (int)le32_to_cpu(sb
->bblog_offset
));
1797 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1802 rdev_for_each(rdev2
, mddev
)
1803 if (rdev2
->desc_nr
+1 > max_dev
)
1804 max_dev
= rdev2
->desc_nr
+1;
1806 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1808 sb
->max_dev
= cpu_to_le32(max_dev
);
1809 rdev
->sb_size
= max_dev
* 2 + 256;
1810 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1811 if (rdev
->sb_size
& bmask
)
1812 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1814 max_dev
= le32_to_cpu(sb
->max_dev
);
1816 for (i
=0; i
<max_dev
;i
++)
1817 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1819 rdev_for_each(rdev2
, mddev
) {
1821 if (test_bit(Faulty
, &rdev2
->flags
))
1822 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1823 else if (test_bit(In_sync
, &rdev2
->flags
))
1824 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1825 else if (rdev2
->raid_disk
>= 0)
1826 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1828 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1831 sb
->sb_csum
= calc_sb_1_csum(sb
);
1834 static unsigned long long
1835 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1837 struct mdp_superblock_1
*sb
;
1838 sector_t max_sectors
;
1839 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1840 return 0; /* component must fit device */
1841 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1842 return 0; /* too confusing */
1843 if (rdev
->sb_start
< rdev
->data_offset
) {
1844 /* minor versions 1 and 2; superblock before data */
1845 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1846 max_sectors
-= rdev
->data_offset
;
1847 if (!num_sectors
|| num_sectors
> max_sectors
)
1848 num_sectors
= max_sectors
;
1849 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1850 /* minor version 0 with bitmap we can't move */
1853 /* minor version 0; superblock after data */
1855 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1856 sb_start
&= ~(sector_t
)(4*2 - 1);
1857 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1858 if (!num_sectors
|| num_sectors
> max_sectors
)
1859 num_sectors
= max_sectors
;
1860 rdev
->sb_start
= sb_start
;
1862 sb
= page_address(rdev
->sb_page
);
1863 sb
->data_size
= cpu_to_le64(num_sectors
);
1864 sb
->super_offset
= rdev
->sb_start
;
1865 sb
->sb_csum
= calc_sb_1_csum(sb
);
1866 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1868 md_super_wait(rdev
->mddev
);
1874 super_1_allow_new_offset(struct md_rdev
*rdev
,
1875 unsigned long long new_offset
)
1877 /* All necessary checks on new >= old have been done */
1878 struct bitmap
*bitmap
;
1879 if (new_offset
>= rdev
->data_offset
)
1882 /* with 1.0 metadata, there is no metadata to tread on
1883 * so we can always move back */
1884 if (rdev
->mddev
->minor_version
== 0)
1887 /* otherwise we must be sure not to step on
1888 * any metadata, so stay:
1889 * 36K beyond start of superblock
1890 * beyond end of badblocks
1891 * beyond write-intent bitmap
1893 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1895 bitmap
= rdev
->mddev
->bitmap
;
1896 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1897 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1898 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1900 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1906 static struct super_type super_types
[] = {
1909 .owner
= THIS_MODULE
,
1910 .load_super
= super_90_load
,
1911 .validate_super
= super_90_validate
,
1912 .sync_super
= super_90_sync
,
1913 .rdev_size_change
= super_90_rdev_size_change
,
1914 .allow_new_offset
= super_90_allow_new_offset
,
1918 .owner
= THIS_MODULE
,
1919 .load_super
= super_1_load
,
1920 .validate_super
= super_1_validate
,
1921 .sync_super
= super_1_sync
,
1922 .rdev_size_change
= super_1_rdev_size_change
,
1923 .allow_new_offset
= super_1_allow_new_offset
,
1927 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1929 if (mddev
->sync_super
) {
1930 mddev
->sync_super(mddev
, rdev
);
1934 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1936 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1939 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1941 struct md_rdev
*rdev
, *rdev2
;
1944 rdev_for_each_rcu(rdev
, mddev1
)
1945 rdev_for_each_rcu(rdev2
, mddev2
)
1946 if (rdev
->bdev
->bd_contains
==
1947 rdev2
->bdev
->bd_contains
) {
1955 static LIST_HEAD(pending_raid_disks
);
1958 * Try to register data integrity profile for an mddev
1960 * This is called when an array is started and after a disk has been kicked
1961 * from the array. It only succeeds if all working and active component devices
1962 * are integrity capable with matching profiles.
1964 int md_integrity_register(struct mddev
*mddev
)
1966 struct md_rdev
*rdev
, *reference
= NULL
;
1968 if (list_empty(&mddev
->disks
))
1969 return 0; /* nothing to do */
1970 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1971 return 0; /* shouldn't register, or already is */
1972 rdev_for_each(rdev
, mddev
) {
1973 /* skip spares and non-functional disks */
1974 if (test_bit(Faulty
, &rdev
->flags
))
1976 if (rdev
->raid_disk
< 0)
1979 /* Use the first rdev as the reference */
1983 /* does this rdev's profile match the reference profile? */
1984 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1985 rdev
->bdev
->bd_disk
) < 0)
1988 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1991 * All component devices are integrity capable and have matching
1992 * profiles, register the common profile for the md device.
1994 if (blk_integrity_register(mddev
->gendisk
,
1995 bdev_get_integrity(reference
->bdev
)) != 0) {
1996 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2000 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2001 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2002 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2008 EXPORT_SYMBOL(md_integrity_register
);
2010 /* Disable data integrity if non-capable/non-matching disk is being added */
2011 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2013 struct blk_integrity
*bi_rdev
;
2014 struct blk_integrity
*bi_mddev
;
2016 if (!mddev
->gendisk
)
2019 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2020 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2022 if (!bi_mddev
) /* nothing to do */
2024 if (rdev
->raid_disk
< 0) /* skip spares */
2026 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2027 rdev
->bdev
->bd_disk
) >= 0)
2029 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2030 blk_integrity_unregister(mddev
->gendisk
);
2032 EXPORT_SYMBOL(md_integrity_add_rdev
);
2034 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2036 char b
[BDEVNAME_SIZE
];
2046 /* prevent duplicates */
2047 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2050 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2051 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2052 rdev
->sectors
< mddev
->dev_sectors
)) {
2054 /* Cannot change size, so fail
2055 * If mddev->level <= 0, then we don't care
2056 * about aligning sizes (e.g. linear)
2058 if (mddev
->level
> 0)
2061 mddev
->dev_sectors
= rdev
->sectors
;
2064 /* Verify rdev->desc_nr is unique.
2065 * If it is -1, assign a free number, else
2066 * check number is not in use
2068 if (rdev
->desc_nr
< 0) {
2070 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2071 while (find_rdev_nr(mddev
, choice
))
2073 rdev
->desc_nr
= choice
;
2075 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2078 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2079 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2080 mdname(mddev
), mddev
->max_disks
);
2083 bdevname(rdev
->bdev
,b
);
2084 while ( (s
=strchr(b
, '/')) != NULL
)
2087 rdev
->mddev
= mddev
;
2088 printk(KERN_INFO
"md: bind<%s>\n", b
);
2090 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2093 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2094 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2095 /* failure here is OK */;
2096 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2098 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2099 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2101 /* May as well allow recovery to be retried once */
2102 mddev
->recovery_disabled
++;
2107 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2112 static void md_delayed_delete(struct work_struct
*ws
)
2114 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2115 kobject_del(&rdev
->kobj
);
2116 kobject_put(&rdev
->kobj
);
2119 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2121 char b
[BDEVNAME_SIZE
];
2126 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2127 list_del_rcu(&rdev
->same_set
);
2128 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2130 sysfs_remove_link(&rdev
->kobj
, "block");
2131 sysfs_put(rdev
->sysfs_state
);
2132 rdev
->sysfs_state
= NULL
;
2133 rdev
->badblocks
.count
= 0;
2134 /* We need to delay this, otherwise we can deadlock when
2135 * writing to 'remove' to "dev/state". We also need
2136 * to delay it due to rcu usage.
2139 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2140 kobject_get(&rdev
->kobj
);
2141 queue_work(md_misc_wq
, &rdev
->del_work
);
2145 * prevent the device from being mounted, repartitioned or
2146 * otherwise reused by a RAID array (or any other kernel
2147 * subsystem), by bd_claiming the device.
2149 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2152 struct block_device
*bdev
;
2153 char b
[BDEVNAME_SIZE
];
2155 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2156 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2158 printk(KERN_ERR
"md: could not open %s.\n",
2159 __bdevname(dev
, b
));
2160 return PTR_ERR(bdev
);
2166 static void unlock_rdev(struct md_rdev
*rdev
)
2168 struct block_device
*bdev
= rdev
->bdev
;
2172 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2175 void md_autodetect_dev(dev_t dev
);
2177 static void export_rdev(struct md_rdev
* rdev
)
2179 char b
[BDEVNAME_SIZE
];
2180 printk(KERN_INFO
"md: export_rdev(%s)\n",
2181 bdevname(rdev
->bdev
,b
));
2184 md_rdev_clear(rdev
);
2186 if (test_bit(AutoDetected
, &rdev
->flags
))
2187 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2190 kobject_put(&rdev
->kobj
);
2193 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2195 unbind_rdev_from_array(rdev
);
2199 static void export_array(struct mddev
*mddev
)
2201 struct md_rdev
*rdev
, *tmp
;
2203 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2208 kick_rdev_from_array(rdev
);
2210 if (!list_empty(&mddev
->disks
))
2212 mddev
->raid_disks
= 0;
2213 mddev
->major_version
= 0;
2216 static void print_desc(mdp_disk_t
*desc
)
2218 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2219 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2222 static void print_sb_90(mdp_super_t
*sb
)
2227 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2228 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2229 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2231 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2232 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2233 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2234 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2235 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2236 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2237 sb
->failed_disks
, sb
->spare_disks
,
2238 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2241 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2244 desc
= sb
->disks
+ i
;
2245 if (desc
->number
|| desc
->major
|| desc
->minor
||
2246 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2247 printk(" D %2d: ", i
);
2251 printk(KERN_INFO
"md: THIS: ");
2252 print_desc(&sb
->this_disk
);
2255 static void print_sb_1(struct mdp_superblock_1
*sb
)
2259 uuid
= sb
->set_uuid
;
2261 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2262 "md: Name: \"%s\" CT:%llu\n",
2263 le32_to_cpu(sb
->major_version
),
2264 le32_to_cpu(sb
->feature_map
),
2267 (unsigned long long)le64_to_cpu(sb
->ctime
)
2268 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2270 uuid
= sb
->device_uuid
;
2272 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2274 "md: Dev:%08x UUID: %pU\n"
2275 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2276 "md: (MaxDev:%u) \n",
2277 le32_to_cpu(sb
->level
),
2278 (unsigned long long)le64_to_cpu(sb
->size
),
2279 le32_to_cpu(sb
->raid_disks
),
2280 le32_to_cpu(sb
->layout
),
2281 le32_to_cpu(sb
->chunksize
),
2282 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2283 (unsigned long long)le64_to_cpu(sb
->data_size
),
2284 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2285 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2286 le32_to_cpu(sb
->dev_number
),
2289 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2290 (unsigned long long)le64_to_cpu(sb
->events
),
2291 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2292 le32_to_cpu(sb
->sb_csum
),
2293 le32_to_cpu(sb
->max_dev
)
2297 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2299 char b
[BDEVNAME_SIZE
];
2300 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2301 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2302 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2304 if (rdev
->sb_loaded
) {
2305 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2306 switch (major_version
) {
2308 print_sb_90(page_address(rdev
->sb_page
));
2311 print_sb_1(page_address(rdev
->sb_page
));
2315 printk(KERN_INFO
"md: no rdev superblock!\n");
2318 static void md_print_devices(void)
2320 struct list_head
*tmp
;
2321 struct md_rdev
*rdev
;
2322 struct mddev
*mddev
;
2323 char b
[BDEVNAME_SIZE
];
2326 printk("md: **********************************\n");
2327 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2328 printk("md: **********************************\n");
2329 for_each_mddev(mddev
, tmp
) {
2332 bitmap_print_sb(mddev
->bitmap
);
2334 printk("%s: ", mdname(mddev
));
2335 rdev_for_each(rdev
, mddev
)
2336 printk("<%s>", bdevname(rdev
->bdev
,b
));
2339 rdev_for_each(rdev
, mddev
)
2340 print_rdev(rdev
, mddev
->major_version
);
2342 printk("md: **********************************\n");
2347 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2349 /* Update each superblock (in-memory image), but
2350 * if we are allowed to, skip spares which already
2351 * have the right event counter, or have one earlier
2352 * (which would mean they aren't being marked as dirty
2353 * with the rest of the array)
2355 struct md_rdev
*rdev
;
2356 rdev_for_each(rdev
, mddev
) {
2357 if (rdev
->sb_events
== mddev
->events
||
2359 rdev
->raid_disk
< 0 &&
2360 rdev
->sb_events
+1 == mddev
->events
)) {
2361 /* Don't update this superblock */
2362 rdev
->sb_loaded
= 2;
2364 sync_super(mddev
, rdev
);
2365 rdev
->sb_loaded
= 1;
2370 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2372 struct md_rdev
*rdev
;
2375 int any_badblocks_changed
= 0;
2379 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2383 /* First make sure individual recovery_offsets are correct */
2384 rdev_for_each(rdev
, mddev
) {
2385 if (rdev
->raid_disk
>= 0 &&
2386 mddev
->delta_disks
>= 0 &&
2387 !test_bit(In_sync
, &rdev
->flags
) &&
2388 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2389 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2392 if (!mddev
->persistent
) {
2393 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2394 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2395 if (!mddev
->external
) {
2396 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2397 rdev_for_each(rdev
, mddev
) {
2398 if (rdev
->badblocks
.changed
) {
2399 rdev
->badblocks
.changed
= 0;
2400 md_ack_all_badblocks(&rdev
->badblocks
);
2401 md_error(mddev
, rdev
);
2403 clear_bit(Blocked
, &rdev
->flags
);
2404 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2405 wake_up(&rdev
->blocked_wait
);
2408 wake_up(&mddev
->sb_wait
);
2412 spin_lock_irq(&mddev
->write_lock
);
2414 mddev
->utime
= get_seconds();
2416 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2418 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2419 /* just a clean<-> dirty transition, possibly leave spares alone,
2420 * though if events isn't the right even/odd, we will have to do
2426 if (mddev
->degraded
)
2427 /* If the array is degraded, then skipping spares is both
2428 * dangerous and fairly pointless.
2429 * Dangerous because a device that was removed from the array
2430 * might have a event_count that still looks up-to-date,
2431 * so it can be re-added without a resync.
2432 * Pointless because if there are any spares to skip,
2433 * then a recovery will happen and soon that array won't
2434 * be degraded any more and the spare can go back to sleep then.
2438 sync_req
= mddev
->in_sync
;
2440 /* If this is just a dirty<->clean transition, and the array is clean
2441 * and 'events' is odd, we can roll back to the previous clean state */
2443 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2444 && mddev
->can_decrease_events
2445 && mddev
->events
!= 1) {
2447 mddev
->can_decrease_events
= 0;
2449 /* otherwise we have to go forward and ... */
2451 mddev
->can_decrease_events
= nospares
;
2454 if (!mddev
->events
) {
2456 * oops, this 64-bit counter should never wrap.
2457 * Either we are in around ~1 trillion A.C., assuming
2458 * 1 reboot per second, or we have a bug:
2464 rdev_for_each(rdev
, mddev
) {
2465 if (rdev
->badblocks
.changed
)
2466 any_badblocks_changed
++;
2467 if (test_bit(Faulty
, &rdev
->flags
))
2468 set_bit(FaultRecorded
, &rdev
->flags
);
2471 sync_sbs(mddev
, nospares
);
2472 spin_unlock_irq(&mddev
->write_lock
);
2474 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2475 mdname(mddev
), mddev
->in_sync
);
2477 bitmap_update_sb(mddev
->bitmap
);
2478 rdev_for_each(rdev
, mddev
) {
2479 char b
[BDEVNAME_SIZE
];
2481 if (rdev
->sb_loaded
!= 1)
2482 continue; /* no noise on spare devices */
2484 if (!test_bit(Faulty
, &rdev
->flags
) &&
2485 rdev
->saved_raid_disk
== -1) {
2486 md_super_write(mddev
,rdev
,
2487 rdev
->sb_start
, rdev
->sb_size
,
2489 pr_debug("md: (write) %s's sb offset: %llu\n",
2490 bdevname(rdev
->bdev
, b
),
2491 (unsigned long long)rdev
->sb_start
);
2492 rdev
->sb_events
= mddev
->events
;
2493 if (rdev
->badblocks
.size
) {
2494 md_super_write(mddev
, rdev
,
2495 rdev
->badblocks
.sector
,
2496 rdev
->badblocks
.size
<< 9,
2498 rdev
->badblocks
.size
= 0;
2501 } else if (test_bit(Faulty
, &rdev
->flags
))
2502 pr_debug("md: %s (skipping faulty)\n",
2503 bdevname(rdev
->bdev
, b
));
2505 pr_debug("(skipping incremental s/r ");
2507 if (mddev
->level
== LEVEL_MULTIPATH
)
2508 /* only need to write one superblock... */
2511 md_super_wait(mddev
);
2512 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2514 spin_lock_irq(&mddev
->write_lock
);
2515 if (mddev
->in_sync
!= sync_req
||
2516 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2517 /* have to write it out again */
2518 spin_unlock_irq(&mddev
->write_lock
);
2521 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2522 spin_unlock_irq(&mddev
->write_lock
);
2523 wake_up(&mddev
->sb_wait
);
2524 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2525 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2527 rdev_for_each(rdev
, mddev
) {
2528 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2529 clear_bit(Blocked
, &rdev
->flags
);
2531 if (any_badblocks_changed
)
2532 md_ack_all_badblocks(&rdev
->badblocks
);
2533 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2534 wake_up(&rdev
->blocked_wait
);
2538 /* words written to sysfs files may, or may not, be \n terminated.
2539 * We want to accept with case. For this we use cmd_match.
2541 static int cmd_match(const char *cmd
, const char *str
)
2543 /* See if cmd, written into a sysfs file, matches
2544 * str. They must either be the same, or cmd can
2545 * have a trailing newline
2547 while (*cmd
&& *str
&& *cmd
== *str
) {
2558 struct rdev_sysfs_entry
{
2559 struct attribute attr
;
2560 ssize_t (*show
)(struct md_rdev
*, char *);
2561 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2565 state_show(struct md_rdev
*rdev
, char *page
)
2570 if (test_bit(Faulty
, &rdev
->flags
) ||
2571 rdev
->badblocks
.unacked_exist
) {
2572 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2575 if (test_bit(In_sync
, &rdev
->flags
)) {
2576 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2579 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2580 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2583 if (test_bit(Blocked
, &rdev
->flags
) ||
2584 (rdev
->badblocks
.unacked_exist
2585 && !test_bit(Faulty
, &rdev
->flags
))) {
2586 len
+= sprintf(page
+len
, "%sblocked", sep
);
2589 if (!test_bit(Faulty
, &rdev
->flags
) &&
2590 !test_bit(In_sync
, &rdev
->flags
)) {
2591 len
+= sprintf(page
+len
, "%sspare", sep
);
2594 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2595 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2598 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2599 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2602 if (test_bit(Replacement
, &rdev
->flags
)) {
2603 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2607 return len
+sprintf(page
+len
, "\n");
2611 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2614 * faulty - simulates an error
2615 * remove - disconnects the device
2616 * writemostly - sets write_mostly
2617 * -writemostly - clears write_mostly
2618 * blocked - sets the Blocked flags
2619 * -blocked - clears the Blocked and possibly simulates an error
2620 * insync - sets Insync providing device isn't active
2621 * write_error - sets WriteErrorSeen
2622 * -write_error - clears WriteErrorSeen
2625 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2626 md_error(rdev
->mddev
, rdev
);
2627 if (test_bit(Faulty
, &rdev
->flags
))
2631 } else if (cmd_match(buf
, "remove")) {
2632 if (rdev
->raid_disk
>= 0)
2635 struct mddev
*mddev
= rdev
->mddev
;
2636 kick_rdev_from_array(rdev
);
2638 md_update_sb(mddev
, 1);
2639 md_new_event(mddev
);
2642 } else if (cmd_match(buf
, "writemostly")) {
2643 set_bit(WriteMostly
, &rdev
->flags
);
2645 } else if (cmd_match(buf
, "-writemostly")) {
2646 clear_bit(WriteMostly
, &rdev
->flags
);
2648 } else if (cmd_match(buf
, "blocked")) {
2649 set_bit(Blocked
, &rdev
->flags
);
2651 } else if (cmd_match(buf
, "-blocked")) {
2652 if (!test_bit(Faulty
, &rdev
->flags
) &&
2653 rdev
->badblocks
.unacked_exist
) {
2654 /* metadata handler doesn't understand badblocks,
2655 * so we need to fail the device
2657 md_error(rdev
->mddev
, rdev
);
2659 clear_bit(Blocked
, &rdev
->flags
);
2660 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2661 wake_up(&rdev
->blocked_wait
);
2662 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2663 md_wakeup_thread(rdev
->mddev
->thread
);
2666 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2667 set_bit(In_sync
, &rdev
->flags
);
2669 } else if (cmd_match(buf
, "write_error")) {
2670 set_bit(WriteErrorSeen
, &rdev
->flags
);
2672 } else if (cmd_match(buf
, "-write_error")) {
2673 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2675 } else if (cmd_match(buf
, "want_replacement")) {
2676 /* Any non-spare device that is not a replacement can
2677 * become want_replacement at any time, but we then need to
2678 * check if recovery is needed.
2680 if (rdev
->raid_disk
>= 0 &&
2681 !test_bit(Replacement
, &rdev
->flags
))
2682 set_bit(WantReplacement
, &rdev
->flags
);
2683 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2684 md_wakeup_thread(rdev
->mddev
->thread
);
2686 } else if (cmd_match(buf
, "-want_replacement")) {
2687 /* Clearing 'want_replacement' is always allowed.
2688 * Once replacements starts it is too late though.
2691 clear_bit(WantReplacement
, &rdev
->flags
);
2692 } else if (cmd_match(buf
, "replacement")) {
2693 /* Can only set a device as a replacement when array has not
2694 * yet been started. Once running, replacement is automatic
2695 * from spares, or by assigning 'slot'.
2697 if (rdev
->mddev
->pers
)
2700 set_bit(Replacement
, &rdev
->flags
);
2703 } else if (cmd_match(buf
, "-replacement")) {
2704 /* Similarly, can only clear Replacement before start */
2705 if (rdev
->mddev
->pers
)
2708 clear_bit(Replacement
, &rdev
->flags
);
2713 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2714 return err
? err
: len
;
2716 static struct rdev_sysfs_entry rdev_state
=
2717 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2720 errors_show(struct md_rdev
*rdev
, char *page
)
2722 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2726 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2729 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2730 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2731 atomic_set(&rdev
->corrected_errors
, n
);
2736 static struct rdev_sysfs_entry rdev_errors
=
2737 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2740 slot_show(struct md_rdev
*rdev
, char *page
)
2742 if (rdev
->raid_disk
< 0)
2743 return sprintf(page
, "none\n");
2745 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2749 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2753 int slot
= simple_strtoul(buf
, &e
, 10);
2754 if (strncmp(buf
, "none", 4)==0)
2756 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2758 if (rdev
->mddev
->pers
&& slot
== -1) {
2759 /* Setting 'slot' on an active array requires also
2760 * updating the 'rd%d' link, and communicating
2761 * with the personality with ->hot_*_disk.
2762 * For now we only support removing
2763 * failed/spare devices. This normally happens automatically,
2764 * but not when the metadata is externally managed.
2766 if (rdev
->raid_disk
== -1)
2768 /* personality does all needed checks */
2769 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2771 clear_bit(Blocked
, &rdev
->flags
);
2772 remove_and_add_spares(rdev
->mddev
, rdev
);
2773 if (rdev
->raid_disk
>= 0)
2775 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2776 md_wakeup_thread(rdev
->mddev
->thread
);
2777 } else if (rdev
->mddev
->pers
) {
2778 /* Activating a spare .. or possibly reactivating
2779 * if we ever get bitmaps working here.
2782 if (rdev
->raid_disk
!= -1)
2785 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2788 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2791 if (slot
>= rdev
->mddev
->raid_disks
&&
2792 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2795 rdev
->raid_disk
= slot
;
2796 if (test_bit(In_sync
, &rdev
->flags
))
2797 rdev
->saved_raid_disk
= slot
;
2799 rdev
->saved_raid_disk
= -1;
2800 clear_bit(In_sync
, &rdev
->flags
);
2801 err
= rdev
->mddev
->pers
->
2802 hot_add_disk(rdev
->mddev
, rdev
);
2804 rdev
->raid_disk
= -1;
2807 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2808 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2809 /* failure here is OK */;
2810 /* don't wakeup anyone, leave that to userspace. */
2812 if (slot
>= rdev
->mddev
->raid_disks
&&
2813 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2815 rdev
->raid_disk
= slot
;
2816 /* assume it is working */
2817 clear_bit(Faulty
, &rdev
->flags
);
2818 clear_bit(WriteMostly
, &rdev
->flags
);
2819 set_bit(In_sync
, &rdev
->flags
);
2820 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2826 static struct rdev_sysfs_entry rdev_slot
=
2827 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2830 offset_show(struct md_rdev
*rdev
, char *page
)
2832 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2836 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2838 unsigned long long offset
;
2839 if (kstrtoull(buf
, 10, &offset
) < 0)
2841 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2843 if (rdev
->sectors
&& rdev
->mddev
->external
)
2844 /* Must set offset before size, so overlap checks
2847 rdev
->data_offset
= offset
;
2848 rdev
->new_data_offset
= offset
;
2852 static struct rdev_sysfs_entry rdev_offset
=
2853 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2855 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2857 return sprintf(page
, "%llu\n",
2858 (unsigned long long)rdev
->new_data_offset
);
2861 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2862 const char *buf
, size_t len
)
2864 unsigned long long new_offset
;
2865 struct mddev
*mddev
= rdev
->mddev
;
2867 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2870 if (mddev
->sync_thread
)
2872 if (new_offset
== rdev
->data_offset
)
2873 /* reset is always permitted */
2875 else if (new_offset
> rdev
->data_offset
) {
2876 /* must not push array size beyond rdev_sectors */
2877 if (new_offset
- rdev
->data_offset
2878 + mddev
->dev_sectors
> rdev
->sectors
)
2881 /* Metadata worries about other space details. */
2883 /* decreasing the offset is inconsistent with a backwards
2886 if (new_offset
< rdev
->data_offset
&&
2887 mddev
->reshape_backwards
)
2889 /* Increasing offset is inconsistent with forwards
2890 * reshape. reshape_direction should be set to
2891 * 'backwards' first.
2893 if (new_offset
> rdev
->data_offset
&&
2894 !mddev
->reshape_backwards
)
2897 if (mddev
->pers
&& mddev
->persistent
&&
2898 !super_types
[mddev
->major_version
]
2899 .allow_new_offset(rdev
, new_offset
))
2901 rdev
->new_data_offset
= new_offset
;
2902 if (new_offset
> rdev
->data_offset
)
2903 mddev
->reshape_backwards
= 1;
2904 else if (new_offset
< rdev
->data_offset
)
2905 mddev
->reshape_backwards
= 0;
2909 static struct rdev_sysfs_entry rdev_new_offset
=
2910 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2913 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2915 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2918 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2920 /* check if two start/length pairs overlap */
2928 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2930 unsigned long long blocks
;
2933 if (kstrtoull(buf
, 10, &blocks
) < 0)
2936 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2937 return -EINVAL
; /* sector conversion overflow */
2940 if (new != blocks
* 2)
2941 return -EINVAL
; /* unsigned long long to sector_t overflow */
2948 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2950 struct mddev
*my_mddev
= rdev
->mddev
;
2951 sector_t oldsectors
= rdev
->sectors
;
2954 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2956 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2957 return -EINVAL
; /* too confusing */
2958 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2959 if (my_mddev
->persistent
) {
2960 sectors
= super_types
[my_mddev
->major_version
].
2961 rdev_size_change(rdev
, sectors
);
2964 } else if (!sectors
)
2965 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2967 if (!my_mddev
->pers
->resize
)
2968 /* Cannot change size for RAID0 or Linear etc */
2971 if (sectors
< my_mddev
->dev_sectors
)
2972 return -EINVAL
; /* component must fit device */
2974 rdev
->sectors
= sectors
;
2975 if (sectors
> oldsectors
&& my_mddev
->external
) {
2976 /* need to check that all other rdevs with the same ->bdev
2977 * do not overlap. We need to unlock the mddev to avoid
2978 * a deadlock. We have already changed rdev->sectors, and if
2979 * we have to change it back, we will have the lock again.
2981 struct mddev
*mddev
;
2983 struct list_head
*tmp
;
2985 mddev_unlock(my_mddev
);
2986 for_each_mddev(mddev
, tmp
) {
2987 struct md_rdev
*rdev2
;
2989 mddev_lock_nointr(mddev
);
2990 rdev_for_each(rdev2
, mddev
)
2991 if (rdev
->bdev
== rdev2
->bdev
&&
2993 overlaps(rdev
->data_offset
, rdev
->sectors
,
2999 mddev_unlock(mddev
);
3005 mddev_lock_nointr(my_mddev
);
3007 /* Someone else could have slipped in a size
3008 * change here, but doing so is just silly.
3009 * We put oldsectors back because we *know* it is
3010 * safe, and trust userspace not to race with
3013 rdev
->sectors
= oldsectors
;
3020 static struct rdev_sysfs_entry rdev_size
=
3021 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3024 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3026 unsigned long long recovery_start
= rdev
->recovery_offset
;
3028 if (test_bit(In_sync
, &rdev
->flags
) ||
3029 recovery_start
== MaxSector
)
3030 return sprintf(page
, "none\n");
3032 return sprintf(page
, "%llu\n", recovery_start
);
3035 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3037 unsigned long long recovery_start
;
3039 if (cmd_match(buf
, "none"))
3040 recovery_start
= MaxSector
;
3041 else if (kstrtoull(buf
, 10, &recovery_start
))
3044 if (rdev
->mddev
->pers
&&
3045 rdev
->raid_disk
>= 0)
3048 rdev
->recovery_offset
= recovery_start
;
3049 if (recovery_start
== MaxSector
)
3050 set_bit(In_sync
, &rdev
->flags
);
3052 clear_bit(In_sync
, &rdev
->flags
);
3056 static struct rdev_sysfs_entry rdev_recovery_start
=
3057 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3061 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3063 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3065 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3067 return badblocks_show(&rdev
->badblocks
, page
, 0);
3069 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3071 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3072 /* Maybe that ack was all we needed */
3073 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3074 wake_up(&rdev
->blocked_wait
);
3077 static struct rdev_sysfs_entry rdev_bad_blocks
=
3078 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3081 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3083 return badblocks_show(&rdev
->badblocks
, page
, 1);
3085 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3087 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3089 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3090 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3092 static struct attribute
*rdev_default_attrs
[] = {
3097 &rdev_new_offset
.attr
,
3099 &rdev_recovery_start
.attr
,
3100 &rdev_bad_blocks
.attr
,
3101 &rdev_unack_bad_blocks
.attr
,
3105 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3107 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3108 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3109 struct mddev
*mddev
= rdev
->mddev
;
3115 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3117 if (rdev
->mddev
== NULL
)
3120 rv
= entry
->show(rdev
, page
);
3121 mddev_unlock(mddev
);
3127 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3128 const char *page
, size_t length
)
3130 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3131 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3133 struct mddev
*mddev
= rdev
->mddev
;
3137 if (!capable(CAP_SYS_ADMIN
))
3139 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3141 if (rdev
->mddev
== NULL
)
3144 rv
= entry
->store(rdev
, page
, length
);
3145 mddev_unlock(mddev
);
3150 static void rdev_free(struct kobject
*ko
)
3152 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3155 static const struct sysfs_ops rdev_sysfs_ops
= {
3156 .show
= rdev_attr_show
,
3157 .store
= rdev_attr_store
,
3159 static struct kobj_type rdev_ktype
= {
3160 .release
= rdev_free
,
3161 .sysfs_ops
= &rdev_sysfs_ops
,
3162 .default_attrs
= rdev_default_attrs
,
3165 int md_rdev_init(struct md_rdev
*rdev
)
3168 rdev
->saved_raid_disk
= -1;
3169 rdev
->raid_disk
= -1;
3171 rdev
->data_offset
= 0;
3172 rdev
->new_data_offset
= 0;
3173 rdev
->sb_events
= 0;
3174 rdev
->last_read_error
.tv_sec
= 0;
3175 rdev
->last_read_error
.tv_nsec
= 0;
3176 rdev
->sb_loaded
= 0;
3177 rdev
->bb_page
= NULL
;
3178 atomic_set(&rdev
->nr_pending
, 0);
3179 atomic_set(&rdev
->read_errors
, 0);
3180 atomic_set(&rdev
->corrected_errors
, 0);
3182 INIT_LIST_HEAD(&rdev
->same_set
);
3183 init_waitqueue_head(&rdev
->blocked_wait
);
3185 /* Add space to store bad block list.
3186 * This reserves the space even on arrays where it cannot
3187 * be used - I wonder if that matters
3189 rdev
->badblocks
.count
= 0;
3190 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3191 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3192 seqlock_init(&rdev
->badblocks
.lock
);
3193 if (rdev
->badblocks
.page
== NULL
)
3198 EXPORT_SYMBOL_GPL(md_rdev_init
);
3200 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3202 * mark the device faulty if:
3204 * - the device is nonexistent (zero size)
3205 * - the device has no valid superblock
3207 * a faulty rdev _never_ has rdev->sb set.
3209 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3211 char b
[BDEVNAME_SIZE
];
3213 struct md_rdev
*rdev
;
3216 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3218 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3219 return ERR_PTR(-ENOMEM
);
3222 err
= md_rdev_init(rdev
);
3225 err
= alloc_disk_sb(rdev
);
3229 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3233 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3235 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3238 "md: %s has zero or unknown size, marking faulty!\n",
3239 bdevname(rdev
->bdev
,b
));
3244 if (super_format
>= 0) {
3245 err
= super_types
[super_format
].
3246 load_super(rdev
, NULL
, super_minor
);
3247 if (err
== -EINVAL
) {
3249 "md: %s does not have a valid v%d.%d "
3250 "superblock, not importing!\n",
3251 bdevname(rdev
->bdev
,b
),
3252 super_format
, super_minor
);
3257 "md: could not read %s's sb, not importing!\n",
3258 bdevname(rdev
->bdev
,b
));
3268 md_rdev_clear(rdev
);
3270 return ERR_PTR(err
);
3274 * Check a full RAID array for plausibility
3278 static void analyze_sbs(struct mddev
* mddev
)
3281 struct md_rdev
*rdev
, *freshest
, *tmp
;
3282 char b
[BDEVNAME_SIZE
];
3285 rdev_for_each_safe(rdev
, tmp
, mddev
)
3286 switch (super_types
[mddev
->major_version
].
3287 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3295 "md: fatal superblock inconsistency in %s"
3296 " -- removing from array\n",
3297 bdevname(rdev
->bdev
,b
));
3298 kick_rdev_from_array(rdev
);
3302 super_types
[mddev
->major_version
].
3303 validate_super(mddev
, freshest
);
3306 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3307 if (mddev
->max_disks
&&
3308 (rdev
->desc_nr
>= mddev
->max_disks
||
3309 i
> mddev
->max_disks
)) {
3311 "md: %s: %s: only %d devices permitted\n",
3312 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3314 kick_rdev_from_array(rdev
);
3317 if (rdev
!= freshest
)
3318 if (super_types
[mddev
->major_version
].
3319 validate_super(mddev
, rdev
)) {
3320 printk(KERN_WARNING
"md: kicking non-fresh %s"
3322 bdevname(rdev
->bdev
,b
));
3323 kick_rdev_from_array(rdev
);
3326 if (mddev
->level
== LEVEL_MULTIPATH
) {
3327 rdev
->desc_nr
= i
++;
3328 rdev
->raid_disk
= rdev
->desc_nr
;
3329 set_bit(In_sync
, &rdev
->flags
);
3330 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3331 rdev
->raid_disk
= -1;
3332 clear_bit(In_sync
, &rdev
->flags
);
3337 /* Read a fixed-point number.
3338 * Numbers in sysfs attributes should be in "standard" units where
3339 * possible, so time should be in seconds.
3340 * However we internally use a a much smaller unit such as
3341 * milliseconds or jiffies.
3342 * This function takes a decimal number with a possible fractional
3343 * component, and produces an integer which is the result of
3344 * multiplying that number by 10^'scale'.
3345 * all without any floating-point arithmetic.
3347 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3349 unsigned long result
= 0;
3351 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3354 else if (decimals
< scale
) {
3357 result
= result
* 10 + value
;
3369 while (decimals
< scale
) {
3378 static void md_safemode_timeout(unsigned long data
);
3381 safe_delay_show(struct mddev
*mddev
, char *page
)
3383 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3384 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3387 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3391 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3394 mddev
->safemode_delay
= 0;
3396 unsigned long old_delay
= mddev
->safemode_delay
;
3397 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3398 if (mddev
->safemode_delay
== 0)
3399 mddev
->safemode_delay
= 1;
3400 if (mddev
->safemode_delay
< old_delay
|| old_delay
== 0)
3401 md_safemode_timeout((unsigned long)mddev
);
3405 static struct md_sysfs_entry md_safe_delay
=
3406 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3409 level_show(struct mddev
*mddev
, char *page
)
3411 struct md_personality
*p
= mddev
->pers
;
3413 return sprintf(page
, "%s\n", p
->name
);
3414 else if (mddev
->clevel
[0])
3415 return sprintf(page
, "%s\n", mddev
->clevel
);
3416 else if (mddev
->level
!= LEVEL_NONE
)
3417 return sprintf(page
, "%d\n", mddev
->level
);
3423 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3427 struct md_personality
*pers
;
3430 struct md_rdev
*rdev
;
3432 if (mddev
->pers
== NULL
) {
3435 if (len
>= sizeof(mddev
->clevel
))
3437 strncpy(mddev
->clevel
, buf
, len
);
3438 if (mddev
->clevel
[len
-1] == '\n')
3440 mddev
->clevel
[len
] = 0;
3441 mddev
->level
= LEVEL_NONE
;
3445 /* request to change the personality. Need to ensure:
3446 * - array is not engaged in resync/recovery/reshape
3447 * - old personality can be suspended
3448 * - new personality will access other array.
3451 if (mddev
->sync_thread
||
3452 mddev
->reshape_position
!= MaxSector
||
3453 mddev
->sysfs_active
)
3456 if (!mddev
->pers
->quiesce
) {
3457 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3458 mdname(mddev
), mddev
->pers
->name
);
3462 /* Now find the new personality */
3463 if (len
== 0 || len
>= sizeof(clevel
))
3465 strncpy(clevel
, buf
, len
);
3466 if (clevel
[len
-1] == '\n')
3469 if (kstrtol(clevel
, 10, &level
))
3472 if (request_module("md-%s", clevel
) != 0)
3473 request_module("md-level-%s", clevel
);
3474 spin_lock(&pers_lock
);
3475 pers
= find_pers(level
, clevel
);
3476 if (!pers
|| !try_module_get(pers
->owner
)) {
3477 spin_unlock(&pers_lock
);
3478 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3481 spin_unlock(&pers_lock
);
3483 if (pers
== mddev
->pers
) {
3484 /* Nothing to do! */
3485 module_put(pers
->owner
);
3488 if (!pers
->takeover
) {
3489 module_put(pers
->owner
);
3490 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3491 mdname(mddev
), clevel
);
3495 rdev_for_each(rdev
, mddev
)
3496 rdev
->new_raid_disk
= rdev
->raid_disk
;
3498 /* ->takeover must set new_* and/or delta_disks
3499 * if it succeeds, and may set them when it fails.
3501 priv
= pers
->takeover(mddev
);
3503 mddev
->new_level
= mddev
->level
;
3504 mddev
->new_layout
= mddev
->layout
;
3505 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3506 mddev
->raid_disks
-= mddev
->delta_disks
;
3507 mddev
->delta_disks
= 0;
3508 mddev
->reshape_backwards
= 0;
3509 module_put(pers
->owner
);
3510 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3511 mdname(mddev
), clevel
);
3512 return PTR_ERR(priv
);
3515 /* Looks like we have a winner */
3516 mddev_suspend(mddev
);
3517 mddev
->pers
->stop(mddev
);
3519 if (mddev
->pers
->sync_request
== NULL
&&
3520 pers
->sync_request
!= NULL
) {
3521 /* need to add the md_redundancy_group */
3522 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3524 "md: cannot register extra attributes for %s\n",
3526 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3528 if (mddev
->pers
->sync_request
!= NULL
&&
3529 pers
->sync_request
== NULL
) {
3530 /* need to remove the md_redundancy_group */
3531 if (mddev
->to_remove
== NULL
)
3532 mddev
->to_remove
= &md_redundancy_group
;
3535 if (mddev
->pers
->sync_request
== NULL
&&
3537 /* We are converting from a no-redundancy array
3538 * to a redundancy array and metadata is managed
3539 * externally so we need to be sure that writes
3540 * won't block due to a need to transition
3542 * until external management is started.
3545 mddev
->safemode_delay
= 0;
3546 mddev
->safemode
= 0;
3549 rdev_for_each(rdev
, mddev
) {
3550 if (rdev
->raid_disk
< 0)
3552 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3553 rdev
->new_raid_disk
= -1;
3554 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3556 sysfs_unlink_rdev(mddev
, rdev
);
3558 rdev_for_each(rdev
, mddev
) {
3559 if (rdev
->raid_disk
< 0)
3561 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3563 rdev
->raid_disk
= rdev
->new_raid_disk
;
3564 if (rdev
->raid_disk
< 0)
3565 clear_bit(In_sync
, &rdev
->flags
);
3567 if (sysfs_link_rdev(mddev
, rdev
))
3568 printk(KERN_WARNING
"md: cannot register rd%d"
3569 " for %s after level change\n",
3570 rdev
->raid_disk
, mdname(mddev
));
3574 module_put(mddev
->pers
->owner
);
3576 mddev
->private = priv
;
3577 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3578 mddev
->level
= mddev
->new_level
;
3579 mddev
->layout
= mddev
->new_layout
;
3580 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3581 mddev
->delta_disks
= 0;
3582 mddev
->reshape_backwards
= 0;
3583 mddev
->degraded
= 0;
3584 if (mddev
->pers
->sync_request
== NULL
) {
3585 /* this is now an array without redundancy, so
3586 * it must always be in_sync
3589 del_timer_sync(&mddev
->safemode_timer
);
3591 blk_set_stacking_limits(&mddev
->queue
->limits
);
3593 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3594 mddev_resume(mddev
);
3595 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3596 md_new_event(mddev
);
3600 static struct md_sysfs_entry md_level
=
3601 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3605 layout_show(struct mddev
*mddev
, char *page
)
3607 /* just a number, not meaningful for all levels */
3608 if (mddev
->reshape_position
!= MaxSector
&&
3609 mddev
->layout
!= mddev
->new_layout
)
3610 return sprintf(page
, "%d (%d)\n",
3611 mddev
->new_layout
, mddev
->layout
);
3612 return sprintf(page
, "%d\n", mddev
->layout
);
3616 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3619 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3621 if (!*buf
|| (*e
&& *e
!= '\n'))
3626 if (mddev
->pers
->check_reshape
== NULL
)
3628 mddev
->new_layout
= n
;
3629 err
= mddev
->pers
->check_reshape(mddev
);
3631 mddev
->new_layout
= mddev
->layout
;
3635 mddev
->new_layout
= n
;
3636 if (mddev
->reshape_position
== MaxSector
)
3641 static struct md_sysfs_entry md_layout
=
3642 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3646 raid_disks_show(struct mddev
*mddev
, char *page
)
3648 if (mddev
->raid_disks
== 0)
3650 if (mddev
->reshape_position
!= MaxSector
&&
3651 mddev
->delta_disks
!= 0)
3652 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3653 mddev
->raid_disks
- mddev
->delta_disks
);
3654 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3657 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3660 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3664 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3666 if (!*buf
|| (*e
&& *e
!= '\n'))
3670 rv
= update_raid_disks(mddev
, n
);
3671 else if (mddev
->reshape_position
!= MaxSector
) {
3672 struct md_rdev
*rdev
;
3673 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3675 rdev_for_each(rdev
, mddev
) {
3677 rdev
->data_offset
< rdev
->new_data_offset
)
3680 rdev
->data_offset
> rdev
->new_data_offset
)
3683 mddev
->delta_disks
= n
- olddisks
;
3684 mddev
->raid_disks
= n
;
3685 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3687 mddev
->raid_disks
= n
;
3688 return rv
? rv
: len
;
3690 static struct md_sysfs_entry md_raid_disks
=
3691 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3694 chunk_size_show(struct mddev
*mddev
, char *page
)
3696 if (mddev
->reshape_position
!= MaxSector
&&
3697 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3698 return sprintf(page
, "%d (%d)\n",
3699 mddev
->new_chunk_sectors
<< 9,
3700 mddev
->chunk_sectors
<< 9);
3701 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3705 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3708 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3710 if (!*buf
|| (*e
&& *e
!= '\n'))
3715 if (mddev
->pers
->check_reshape
== NULL
)
3717 mddev
->new_chunk_sectors
= n
>> 9;
3718 err
= mddev
->pers
->check_reshape(mddev
);
3720 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3724 mddev
->new_chunk_sectors
= n
>> 9;
3725 if (mddev
->reshape_position
== MaxSector
)
3726 mddev
->chunk_sectors
= n
>> 9;
3730 static struct md_sysfs_entry md_chunk_size
=
3731 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3734 resync_start_show(struct mddev
*mddev
, char *page
)
3736 if (mddev
->recovery_cp
== MaxSector
)
3737 return sprintf(page
, "none\n");
3738 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3742 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3745 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3747 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3749 if (cmd_match(buf
, "none"))
3751 else if (!*buf
|| (*e
&& *e
!= '\n'))
3754 mddev
->recovery_cp
= n
;
3756 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3759 static struct md_sysfs_entry md_resync_start
=
3760 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3763 * The array state can be:
3766 * No devices, no size, no level
3767 * Equivalent to STOP_ARRAY ioctl
3769 * May have some settings, but array is not active
3770 * all IO results in error
3771 * When written, doesn't tear down array, but just stops it
3772 * suspended (not supported yet)
3773 * All IO requests will block. The array can be reconfigured.
3774 * Writing this, if accepted, will block until array is quiescent
3776 * no resync can happen. no superblocks get written.
3777 * write requests fail
3779 * like readonly, but behaves like 'clean' on a write request.
3781 * clean - no pending writes, but otherwise active.
3782 * When written to inactive array, starts without resync
3783 * If a write request arrives then
3784 * if metadata is known, mark 'dirty' and switch to 'active'.
3785 * if not known, block and switch to write-pending
3786 * If written to an active array that has pending writes, then fails.
3788 * fully active: IO and resync can be happening.
3789 * When written to inactive array, starts with resync
3792 * clean, but writes are blocked waiting for 'active' to be written.
3795 * like active, but no writes have been seen for a while (100msec).
3798 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3799 write_pending
, active_idle
, bad_word
};
3800 static char *array_states
[] = {
3801 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3802 "write-pending", "active-idle", NULL
};
3804 static int match_word(const char *word
, char **list
)
3807 for (n
=0; list
[n
]; n
++)
3808 if (cmd_match(word
, list
[n
]))
3814 array_state_show(struct mddev
*mddev
, char *page
)
3816 enum array_state st
= inactive
;
3829 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3831 else if (mddev
->safemode
)
3837 if (list_empty(&mddev
->disks
) &&
3838 mddev
->raid_disks
== 0 &&
3839 mddev
->dev_sectors
== 0)
3844 return sprintf(page
, "%s\n", array_states
[st
]);
3847 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3848 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3849 static int do_md_run(struct mddev
* mddev
);
3850 static int restart_array(struct mddev
*mddev
);
3853 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3856 enum array_state st
= match_word(buf
, array_states
);
3861 /* stopping an active array */
3862 err
= do_md_stop(mddev
, 0, NULL
);
3865 /* stopping an active array */
3867 err
= do_md_stop(mddev
, 2, NULL
);
3869 err
= 0; /* already inactive */
3872 break; /* not supported yet */
3875 err
= md_set_readonly(mddev
, NULL
);
3878 set_disk_ro(mddev
->gendisk
, 1);
3879 err
= do_md_run(mddev
);
3885 err
= md_set_readonly(mddev
, NULL
);
3886 else if (mddev
->ro
== 1)
3887 err
= restart_array(mddev
);
3890 set_disk_ro(mddev
->gendisk
, 0);
3894 err
= do_md_run(mddev
);
3899 restart_array(mddev
);
3900 spin_lock_irq(&mddev
->write_lock
);
3901 if (atomic_read(&mddev
->writes_pending
) == 0) {
3902 if (mddev
->in_sync
== 0) {
3904 if (mddev
->safemode
== 1)
3905 mddev
->safemode
= 0;
3906 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3911 spin_unlock_irq(&mddev
->write_lock
);
3917 restart_array(mddev
);
3918 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3919 wake_up(&mddev
->sb_wait
);
3923 set_disk_ro(mddev
->gendisk
, 0);
3924 err
= do_md_run(mddev
);
3929 /* these cannot be set */
3935 if (mddev
->hold_active
== UNTIL_IOCTL
)
3936 mddev
->hold_active
= 0;
3937 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3941 static struct md_sysfs_entry md_array_state
=
3942 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3945 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3946 return sprintf(page
, "%d\n",
3947 atomic_read(&mddev
->max_corr_read_errors
));
3951 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3954 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3956 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3957 atomic_set(&mddev
->max_corr_read_errors
, n
);
3963 static struct md_sysfs_entry max_corr_read_errors
=
3964 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3965 max_corrected_read_errors_store
);
3968 null_show(struct mddev
*mddev
, char *page
)
3974 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3976 /* buf must be %d:%d\n? giving major and minor numbers */
3977 /* The new device is added to the array.
3978 * If the array has a persistent superblock, we read the
3979 * superblock to initialise info and check validity.
3980 * Otherwise, only checking done is that in bind_rdev_to_array,
3981 * which mainly checks size.
3984 int major
= simple_strtoul(buf
, &e
, 10);
3987 struct md_rdev
*rdev
;
3990 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3992 minor
= simple_strtoul(e
+1, &e
, 10);
3993 if (*e
&& *e
!= '\n')
3995 dev
= MKDEV(major
, minor
);
3996 if (major
!= MAJOR(dev
) ||
3997 minor
!= MINOR(dev
))
4001 if (mddev
->persistent
) {
4002 rdev
= md_import_device(dev
, mddev
->major_version
,
4003 mddev
->minor_version
);
4004 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4005 struct md_rdev
*rdev0
4006 = list_entry(mddev
->disks
.next
,
4007 struct md_rdev
, same_set
);
4008 err
= super_types
[mddev
->major_version
]
4009 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4013 } else if (mddev
->external
)
4014 rdev
= md_import_device(dev
, -2, -1);
4016 rdev
= md_import_device(dev
, -1, -1);
4019 return PTR_ERR(rdev
);
4020 err
= bind_rdev_to_array(rdev
, mddev
);
4024 return err
? err
: len
;
4027 static struct md_sysfs_entry md_new_device
=
4028 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4031 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4034 unsigned long chunk
, end_chunk
;
4038 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4040 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4041 if (buf
== end
) break;
4042 if (*end
== '-') { /* range */
4044 end_chunk
= simple_strtoul(buf
, &end
, 0);
4045 if (buf
== end
) break;
4047 if (*end
&& !isspace(*end
)) break;
4048 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4049 buf
= skip_spaces(end
);
4051 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4056 static struct md_sysfs_entry md_bitmap
=
4057 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4060 size_show(struct mddev
*mddev
, char *page
)
4062 return sprintf(page
, "%llu\n",
4063 (unsigned long long)mddev
->dev_sectors
/ 2);
4066 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4069 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4071 /* If array is inactive, we can reduce the component size, but
4072 * not increase it (except from 0).
4073 * If array is active, we can try an on-line resize
4076 int err
= strict_blocks_to_sectors(buf
, §ors
);
4081 err
= update_size(mddev
, sectors
);
4082 md_update_sb(mddev
, 1);
4084 if (mddev
->dev_sectors
== 0 ||
4085 mddev
->dev_sectors
> sectors
)
4086 mddev
->dev_sectors
= sectors
;
4090 return err
? err
: len
;
4093 static struct md_sysfs_entry md_size
=
4094 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4097 /* Metadata version.
4099 * 'none' for arrays with no metadata (good luck...)
4100 * 'external' for arrays with externally managed metadata,
4101 * or N.M for internally known formats
4104 metadata_show(struct mddev
*mddev
, char *page
)
4106 if (mddev
->persistent
)
4107 return sprintf(page
, "%d.%d\n",
4108 mddev
->major_version
, mddev
->minor_version
);
4109 else if (mddev
->external
)
4110 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4112 return sprintf(page
, "none\n");
4116 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4120 /* Changing the details of 'external' metadata is
4121 * always permitted. Otherwise there must be
4122 * no devices attached to the array.
4124 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4126 else if (!list_empty(&mddev
->disks
))
4129 if (cmd_match(buf
, "none")) {
4130 mddev
->persistent
= 0;
4131 mddev
->external
= 0;
4132 mddev
->major_version
= 0;
4133 mddev
->minor_version
= 90;
4136 if (strncmp(buf
, "external:", 9) == 0) {
4137 size_t namelen
= len
-9;
4138 if (namelen
>= sizeof(mddev
->metadata_type
))
4139 namelen
= sizeof(mddev
->metadata_type
)-1;
4140 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4141 mddev
->metadata_type
[namelen
] = 0;
4142 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4143 mddev
->metadata_type
[--namelen
] = 0;
4144 mddev
->persistent
= 0;
4145 mddev
->external
= 1;
4146 mddev
->major_version
= 0;
4147 mddev
->minor_version
= 90;
4150 major
= simple_strtoul(buf
, &e
, 10);
4151 if (e
==buf
|| *e
!= '.')
4154 minor
= simple_strtoul(buf
, &e
, 10);
4155 if (e
==buf
|| (*e
&& *e
!= '\n') )
4157 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4159 mddev
->major_version
= major
;
4160 mddev
->minor_version
= minor
;
4161 mddev
->persistent
= 1;
4162 mddev
->external
= 0;
4166 static struct md_sysfs_entry md_metadata
=
4167 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4170 action_show(struct mddev
*mddev
, char *page
)
4172 char *type
= "idle";
4173 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4175 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4176 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4177 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4179 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4180 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4182 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4186 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4189 return sprintf(page
, "%s\n", type
);
4193 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4195 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4198 if (cmd_match(page
, "frozen"))
4199 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4201 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4203 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4204 if (mddev
->sync_thread
) {
4205 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4206 md_reap_sync_thread(mddev
);
4208 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4209 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4211 else if (cmd_match(page
, "resync"))
4212 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4213 else if (cmd_match(page
, "recover")) {
4214 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4215 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4216 } else if (cmd_match(page
, "reshape")) {
4218 if (mddev
->pers
->start_reshape
== NULL
)
4220 err
= mddev
->pers
->start_reshape(mddev
);
4223 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4225 if (cmd_match(page
, "check"))
4226 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4227 else if (!cmd_match(page
, "repair"))
4229 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4230 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4232 if (mddev
->ro
== 2) {
4233 /* A write to sync_action is enough to justify
4234 * canceling read-auto mode
4237 md_wakeup_thread(mddev
->sync_thread
);
4239 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4240 md_wakeup_thread(mddev
->thread
);
4241 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4245 static struct md_sysfs_entry md_scan_mode
=
4246 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4249 last_sync_action_show(struct mddev
*mddev
, char *page
)
4251 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4254 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4257 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4259 return sprintf(page
, "%llu\n",
4260 (unsigned long long)
4261 atomic64_read(&mddev
->resync_mismatches
));
4264 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4267 sync_min_show(struct mddev
*mddev
, char *page
)
4269 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4270 mddev
->sync_speed_min
? "local": "system");
4274 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4278 if (strncmp(buf
, "system", 6)==0) {
4279 mddev
->sync_speed_min
= 0;
4282 min
= simple_strtoul(buf
, &e
, 10);
4283 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4285 mddev
->sync_speed_min
= min
;
4289 static struct md_sysfs_entry md_sync_min
=
4290 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4293 sync_max_show(struct mddev
*mddev
, char *page
)
4295 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4296 mddev
->sync_speed_max
? "local": "system");
4300 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4304 if (strncmp(buf
, "system", 6)==0) {
4305 mddev
->sync_speed_max
= 0;
4308 max
= simple_strtoul(buf
, &e
, 10);
4309 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4311 mddev
->sync_speed_max
= max
;
4315 static struct md_sysfs_entry md_sync_max
=
4316 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4319 degraded_show(struct mddev
*mddev
, char *page
)
4321 return sprintf(page
, "%d\n", mddev
->degraded
);
4323 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4326 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4328 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4332 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4336 if (kstrtol(buf
, 10, &n
))
4339 if (n
!= 0 && n
!= 1)
4342 mddev
->parallel_resync
= n
;
4344 if (mddev
->sync_thread
)
4345 wake_up(&resync_wait
);
4350 /* force parallel resync, even with shared block devices */
4351 static struct md_sysfs_entry md_sync_force_parallel
=
4352 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4353 sync_force_parallel_show
, sync_force_parallel_store
);
4356 sync_speed_show(struct mddev
*mddev
, char *page
)
4358 unsigned long resync
, dt
, db
;
4359 if (mddev
->curr_resync
== 0)
4360 return sprintf(page
, "none\n");
4361 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4362 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4364 db
= resync
- mddev
->resync_mark_cnt
;
4365 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4368 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4371 sync_completed_show(struct mddev
*mddev
, char *page
)
4373 unsigned long long max_sectors
, resync
;
4375 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4376 return sprintf(page
, "none\n");
4378 if (mddev
->curr_resync
== 1 ||
4379 mddev
->curr_resync
== 2)
4380 return sprintf(page
, "delayed\n");
4382 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4383 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4384 max_sectors
= mddev
->resync_max_sectors
;
4386 max_sectors
= mddev
->dev_sectors
;
4388 resync
= mddev
->curr_resync_completed
;
4389 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4392 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4395 min_sync_show(struct mddev
*mddev
, char *page
)
4397 return sprintf(page
, "%llu\n",
4398 (unsigned long long)mddev
->resync_min
);
4401 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4403 unsigned long long min
;
4404 if (kstrtoull(buf
, 10, &min
))
4406 if (min
> mddev
->resync_max
)
4408 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4411 /* Must be a multiple of chunk_size */
4412 if (mddev
->chunk_sectors
) {
4413 sector_t temp
= min
;
4414 if (sector_div(temp
, mddev
->chunk_sectors
))
4417 mddev
->resync_min
= min
;
4422 static struct md_sysfs_entry md_min_sync
=
4423 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4426 max_sync_show(struct mddev
*mddev
, char *page
)
4428 if (mddev
->resync_max
== MaxSector
)
4429 return sprintf(page
, "max\n");
4431 return sprintf(page
, "%llu\n",
4432 (unsigned long long)mddev
->resync_max
);
4435 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4437 if (strncmp(buf
, "max", 3) == 0)
4438 mddev
->resync_max
= MaxSector
;
4440 unsigned long long max
;
4441 if (kstrtoull(buf
, 10, &max
))
4443 if (max
< mddev
->resync_min
)
4445 if (max
< mddev
->resync_max
&&
4447 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4450 /* Must be a multiple of chunk_size */
4451 if (mddev
->chunk_sectors
) {
4452 sector_t temp
= max
;
4453 if (sector_div(temp
, mddev
->chunk_sectors
))
4456 mddev
->resync_max
= max
;
4458 wake_up(&mddev
->recovery_wait
);
4462 static struct md_sysfs_entry md_max_sync
=
4463 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4466 suspend_lo_show(struct mddev
*mddev
, char *page
)
4468 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4472 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4475 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4476 unsigned long long old
= mddev
->suspend_lo
;
4478 if (mddev
->pers
== NULL
||
4479 mddev
->pers
->quiesce
== NULL
)
4481 if (buf
== e
|| (*e
&& *e
!= '\n'))
4484 mddev
->suspend_lo
= new;
4486 /* Shrinking suspended region */
4487 mddev
->pers
->quiesce(mddev
, 2);
4489 /* Expanding suspended region - need to wait */
4490 mddev
->pers
->quiesce(mddev
, 1);
4491 mddev
->pers
->quiesce(mddev
, 0);
4495 static struct md_sysfs_entry md_suspend_lo
=
4496 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4500 suspend_hi_show(struct mddev
*mddev
, char *page
)
4502 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4506 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4509 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4510 unsigned long long old
= mddev
->suspend_hi
;
4512 if (mddev
->pers
== NULL
||
4513 mddev
->pers
->quiesce
== NULL
)
4515 if (buf
== e
|| (*e
&& *e
!= '\n'))
4518 mddev
->suspend_hi
= new;
4520 /* Shrinking suspended region */
4521 mddev
->pers
->quiesce(mddev
, 2);
4523 /* Expanding suspended region - need to wait */
4524 mddev
->pers
->quiesce(mddev
, 1);
4525 mddev
->pers
->quiesce(mddev
, 0);
4529 static struct md_sysfs_entry md_suspend_hi
=
4530 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4533 reshape_position_show(struct mddev
*mddev
, char *page
)
4535 if (mddev
->reshape_position
!= MaxSector
)
4536 return sprintf(page
, "%llu\n",
4537 (unsigned long long)mddev
->reshape_position
);
4538 strcpy(page
, "none\n");
4543 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4545 struct md_rdev
*rdev
;
4547 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4550 if (buf
== e
|| (*e
&& *e
!= '\n'))
4552 mddev
->reshape_position
= new;
4553 mddev
->delta_disks
= 0;
4554 mddev
->reshape_backwards
= 0;
4555 mddev
->new_level
= mddev
->level
;
4556 mddev
->new_layout
= mddev
->layout
;
4557 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4558 rdev_for_each(rdev
, mddev
)
4559 rdev
->new_data_offset
= rdev
->data_offset
;
4563 static struct md_sysfs_entry md_reshape_position
=
4564 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4565 reshape_position_store
);
4568 reshape_direction_show(struct mddev
*mddev
, char *page
)
4570 return sprintf(page
, "%s\n",
4571 mddev
->reshape_backwards
? "backwards" : "forwards");
4575 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4578 if (cmd_match(buf
, "forwards"))
4580 else if (cmd_match(buf
, "backwards"))
4584 if (mddev
->reshape_backwards
== backwards
)
4587 /* check if we are allowed to change */
4588 if (mddev
->delta_disks
)
4591 if (mddev
->persistent
&&
4592 mddev
->major_version
== 0)
4595 mddev
->reshape_backwards
= backwards
;
4599 static struct md_sysfs_entry md_reshape_direction
=
4600 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4601 reshape_direction_store
);
4604 array_size_show(struct mddev
*mddev
, char *page
)
4606 if (mddev
->external_size
)
4607 return sprintf(page
, "%llu\n",
4608 (unsigned long long)mddev
->array_sectors
/2);
4610 return sprintf(page
, "default\n");
4614 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4618 if (strncmp(buf
, "default", 7) == 0) {
4620 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4622 sectors
= mddev
->array_sectors
;
4624 mddev
->external_size
= 0;
4626 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4628 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4631 mddev
->external_size
= 1;
4634 mddev
->array_sectors
= sectors
;
4636 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4637 revalidate_disk(mddev
->gendisk
);
4642 static struct md_sysfs_entry md_array_size
=
4643 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4646 static struct attribute
*md_default_attrs
[] = {
4649 &md_raid_disks
.attr
,
4650 &md_chunk_size
.attr
,
4652 &md_resync_start
.attr
,
4654 &md_new_device
.attr
,
4655 &md_safe_delay
.attr
,
4656 &md_array_state
.attr
,
4657 &md_reshape_position
.attr
,
4658 &md_reshape_direction
.attr
,
4659 &md_array_size
.attr
,
4660 &max_corr_read_errors
.attr
,
4664 static struct attribute
*md_redundancy_attrs
[] = {
4666 &md_last_scan_mode
.attr
,
4667 &md_mismatches
.attr
,
4670 &md_sync_speed
.attr
,
4671 &md_sync_force_parallel
.attr
,
4672 &md_sync_completed
.attr
,
4675 &md_suspend_lo
.attr
,
4676 &md_suspend_hi
.attr
,
4681 static struct attribute_group md_redundancy_group
= {
4683 .attrs
= md_redundancy_attrs
,
4688 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4690 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4691 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4696 spin_lock(&all_mddevs_lock
);
4697 if (list_empty(&mddev
->all_mddevs
)) {
4698 spin_unlock(&all_mddevs_lock
);
4702 spin_unlock(&all_mddevs_lock
);
4704 rv
= mddev_lock(mddev
);
4706 rv
= entry
->show(mddev
, page
);
4707 mddev_unlock(mddev
);
4714 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4715 const char *page
, size_t length
)
4717 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4718 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4723 if (!capable(CAP_SYS_ADMIN
))
4725 spin_lock(&all_mddevs_lock
);
4726 if (list_empty(&mddev
->all_mddevs
)) {
4727 spin_unlock(&all_mddevs_lock
);
4731 spin_unlock(&all_mddevs_lock
);
4732 if (entry
->store
== new_dev_store
)
4733 flush_workqueue(md_misc_wq
);
4734 rv
= mddev_lock(mddev
);
4736 rv
= entry
->store(mddev
, page
, length
);
4737 mddev_unlock(mddev
);
4743 static void md_free(struct kobject
*ko
)
4745 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4747 if (mddev
->sysfs_state
)
4748 sysfs_put(mddev
->sysfs_state
);
4750 if (mddev
->gendisk
) {
4751 del_gendisk(mddev
->gendisk
);
4752 put_disk(mddev
->gendisk
);
4755 blk_cleanup_queue(mddev
->queue
);
4760 static const struct sysfs_ops md_sysfs_ops
= {
4761 .show
= md_attr_show
,
4762 .store
= md_attr_store
,
4764 static struct kobj_type md_ktype
= {
4766 .sysfs_ops
= &md_sysfs_ops
,
4767 .default_attrs
= md_default_attrs
,
4772 static void mddev_delayed_delete(struct work_struct
*ws
)
4774 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4776 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4777 kobject_del(&mddev
->kobj
);
4778 kobject_put(&mddev
->kobj
);
4781 static int md_alloc(dev_t dev
, char *name
)
4783 static DEFINE_MUTEX(disks_mutex
);
4784 struct mddev
*mddev
= mddev_find(dev
);
4785 struct gendisk
*disk
;
4794 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4795 shift
= partitioned
? MdpMinorShift
: 0;
4796 unit
= MINOR(mddev
->unit
) >> shift
;
4798 /* wait for any previous instance of this device to be
4799 * completely removed (mddev_delayed_delete).
4801 flush_workqueue(md_misc_wq
);
4803 mutex_lock(&disks_mutex
);
4809 /* Need to ensure that 'name' is not a duplicate.
4811 struct mddev
*mddev2
;
4812 spin_lock(&all_mddevs_lock
);
4814 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4815 if (mddev2
->gendisk
&&
4816 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4817 spin_unlock(&all_mddevs_lock
);
4820 spin_unlock(&all_mddevs_lock
);
4824 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4827 mddev
->queue
->queuedata
= mddev
;
4829 blk_queue_make_request(mddev
->queue
, md_make_request
);
4830 blk_set_stacking_limits(&mddev
->queue
->limits
);
4832 disk
= alloc_disk(1 << shift
);
4834 blk_cleanup_queue(mddev
->queue
);
4835 mddev
->queue
= NULL
;
4838 disk
->major
= MAJOR(mddev
->unit
);
4839 disk
->first_minor
= unit
<< shift
;
4841 strcpy(disk
->disk_name
, name
);
4842 else if (partitioned
)
4843 sprintf(disk
->disk_name
, "md_d%d", unit
);
4845 sprintf(disk
->disk_name
, "md%d", unit
);
4846 disk
->fops
= &md_fops
;
4847 disk
->private_data
= mddev
;
4848 disk
->queue
= mddev
->queue
;
4849 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4850 /* Allow extended partitions. This makes the
4851 * 'mdp' device redundant, but we can't really
4854 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4855 mddev
->gendisk
= disk
;
4856 /* As soon as we call add_disk(), another thread could get
4857 * through to md_open, so make sure it doesn't get too far
4859 mutex_lock(&mddev
->open_mutex
);
4862 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4863 &disk_to_dev(disk
)->kobj
, "%s", "md");
4865 /* This isn't possible, but as kobject_init_and_add is marked
4866 * __must_check, we must do something with the result
4868 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4872 if (mddev
->kobj
.sd
&&
4873 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4874 printk(KERN_DEBUG
"pointless warning\n");
4875 mutex_unlock(&mddev
->open_mutex
);
4877 mutex_unlock(&disks_mutex
);
4878 if (!error
&& mddev
->kobj
.sd
) {
4879 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4880 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4886 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4888 md_alloc(dev
, NULL
);
4892 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4894 /* val must be "md_*" where * is not all digits.
4895 * We allocate an array with a large free minor number, and
4896 * set the name to val. val must not already be an active name.
4898 int len
= strlen(val
);
4899 char buf
[DISK_NAME_LEN
];
4901 while (len
&& val
[len
-1] == '\n')
4903 if (len
>= DISK_NAME_LEN
)
4905 strlcpy(buf
, val
, len
+1);
4906 if (strncmp(buf
, "md_", 3) != 0)
4908 return md_alloc(0, buf
);
4911 static void md_safemode_timeout(unsigned long data
)
4913 struct mddev
*mddev
= (struct mddev
*) data
;
4915 if (!atomic_read(&mddev
->writes_pending
)) {
4916 mddev
->safemode
= 1;
4917 if (mddev
->external
)
4918 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4920 md_wakeup_thread(mddev
->thread
);
4923 static int start_dirty_degraded
;
4925 int md_run(struct mddev
*mddev
)
4928 struct md_rdev
*rdev
;
4929 struct md_personality
*pers
;
4931 if (list_empty(&mddev
->disks
))
4932 /* cannot run an array with no devices.. */
4937 /* Cannot run until previous stop completes properly */
4938 if (mddev
->sysfs_active
)
4942 * Analyze all RAID superblock(s)
4944 if (!mddev
->raid_disks
) {
4945 if (!mddev
->persistent
)
4950 if (mddev
->level
!= LEVEL_NONE
)
4951 request_module("md-level-%d", mddev
->level
);
4952 else if (mddev
->clevel
[0])
4953 request_module("md-%s", mddev
->clevel
);
4956 * Drop all container device buffers, from now on
4957 * the only valid external interface is through the md
4960 rdev_for_each(rdev
, mddev
) {
4961 if (test_bit(Faulty
, &rdev
->flags
))
4963 sync_blockdev(rdev
->bdev
);
4964 invalidate_bdev(rdev
->bdev
);
4966 /* perform some consistency tests on the device.
4967 * We don't want the data to overlap the metadata,
4968 * Internal Bitmap issues have been handled elsewhere.
4970 if (rdev
->meta_bdev
) {
4971 /* Nothing to check */;
4972 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4973 if (mddev
->dev_sectors
&&
4974 rdev
->data_offset
+ mddev
->dev_sectors
4976 printk("md: %s: data overlaps metadata\n",
4981 if (rdev
->sb_start
+ rdev
->sb_size
/512
4982 > rdev
->data_offset
) {
4983 printk("md: %s: metadata overlaps data\n",
4988 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4991 if (mddev
->bio_set
== NULL
)
4992 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
4994 spin_lock(&pers_lock
);
4995 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4996 if (!pers
|| !try_module_get(pers
->owner
)) {
4997 spin_unlock(&pers_lock
);
4998 if (mddev
->level
!= LEVEL_NONE
)
4999 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5002 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5007 spin_unlock(&pers_lock
);
5008 if (mddev
->level
!= pers
->level
) {
5009 mddev
->level
= pers
->level
;
5010 mddev
->new_level
= pers
->level
;
5012 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5014 if (mddev
->reshape_position
!= MaxSector
&&
5015 pers
->start_reshape
== NULL
) {
5016 /* This personality cannot handle reshaping... */
5018 module_put(pers
->owner
);
5022 if (pers
->sync_request
) {
5023 /* Warn if this is a potentially silly
5026 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5027 struct md_rdev
*rdev2
;
5030 rdev_for_each(rdev
, mddev
)
5031 rdev_for_each(rdev2
, mddev
) {
5033 rdev
->bdev
->bd_contains
==
5034 rdev2
->bdev
->bd_contains
) {
5036 "%s: WARNING: %s appears to be"
5037 " on the same physical disk as"
5040 bdevname(rdev
->bdev
,b
),
5041 bdevname(rdev2
->bdev
,b2
));
5048 "True protection against single-disk"
5049 " failure might be compromised.\n");
5052 mddev
->recovery
= 0;
5053 /* may be over-ridden by personality */
5054 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5056 mddev
->ok_start_degraded
= start_dirty_degraded
;
5058 if (start_readonly
&& mddev
->ro
== 0)
5059 mddev
->ro
= 2; /* read-only, but switch on first write */
5061 err
= mddev
->pers
->run(mddev
);
5063 printk(KERN_ERR
"md: pers->run() failed ...\n");
5064 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5065 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5066 " but 'external_size' not in effect?\n", __func__
);
5068 "md: invalid array_size %llu > default size %llu\n",
5069 (unsigned long long)mddev
->array_sectors
/ 2,
5070 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5072 mddev
->pers
->stop(mddev
);
5074 if (err
== 0 && mddev
->pers
->sync_request
&&
5075 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5076 err
= bitmap_create(mddev
);
5078 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5079 mdname(mddev
), err
);
5080 mddev
->pers
->stop(mddev
);
5084 module_put(mddev
->pers
->owner
);
5086 bitmap_destroy(mddev
);
5089 if (mddev
->pers
->sync_request
) {
5090 if (mddev
->kobj
.sd
&&
5091 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5093 "md: cannot register extra attributes for %s\n",
5095 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5096 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5099 atomic_set(&mddev
->writes_pending
,0);
5100 atomic_set(&mddev
->max_corr_read_errors
,
5101 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5102 mddev
->safemode
= 0;
5103 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5104 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5105 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5109 rdev_for_each(rdev
, mddev
)
5110 if (rdev
->raid_disk
>= 0)
5111 if (sysfs_link_rdev(mddev
, rdev
))
5112 /* failure here is OK */;
5114 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5116 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5117 md_update_sb(mddev
, 0);
5119 md_new_event(mddev
);
5120 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5121 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5122 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5125 EXPORT_SYMBOL_GPL(md_run
);
5127 static int do_md_run(struct mddev
*mddev
)
5131 err
= md_run(mddev
);
5134 err
= bitmap_load(mddev
);
5136 bitmap_destroy(mddev
);
5140 md_wakeup_thread(mddev
->thread
);
5141 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5143 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5144 revalidate_disk(mddev
->gendisk
);
5146 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5151 static int restart_array(struct mddev
*mddev
)
5153 struct gendisk
*disk
= mddev
->gendisk
;
5155 /* Complain if it has no devices */
5156 if (list_empty(&mddev
->disks
))
5162 mddev
->safemode
= 0;
5164 set_disk_ro(disk
, 0);
5165 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5167 /* Kick recovery or resync if necessary */
5168 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5169 md_wakeup_thread(mddev
->thread
);
5170 md_wakeup_thread(mddev
->sync_thread
);
5171 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5175 /* similar to deny_write_access, but accounts for our holding a reference
5176 * to the file ourselves */
5177 static int deny_bitmap_write_access(struct file
* file
)
5179 struct inode
*inode
= file
->f_mapping
->host
;
5181 spin_lock(&inode
->i_lock
);
5182 if (atomic_read(&inode
->i_writecount
) > 1) {
5183 spin_unlock(&inode
->i_lock
);
5186 atomic_set(&inode
->i_writecount
, -1);
5187 spin_unlock(&inode
->i_lock
);
5192 void restore_bitmap_write_access(struct file
*file
)
5194 struct inode
*inode
= file
->f_mapping
->host
;
5196 spin_lock(&inode
->i_lock
);
5197 atomic_set(&inode
->i_writecount
, 1);
5198 spin_unlock(&inode
->i_lock
);
5201 static void md_clean(struct mddev
*mddev
)
5203 mddev
->array_sectors
= 0;
5204 mddev
->external_size
= 0;
5205 mddev
->dev_sectors
= 0;
5206 mddev
->raid_disks
= 0;
5207 mddev
->recovery_cp
= 0;
5208 mddev
->resync_min
= 0;
5209 mddev
->resync_max
= MaxSector
;
5210 mddev
->reshape_position
= MaxSector
;
5211 mddev
->external
= 0;
5212 mddev
->persistent
= 0;
5213 mddev
->level
= LEVEL_NONE
;
5214 mddev
->clevel
[0] = 0;
5217 mddev
->metadata_type
[0] = 0;
5218 mddev
->chunk_sectors
= 0;
5219 mddev
->ctime
= mddev
->utime
= 0;
5221 mddev
->max_disks
= 0;
5223 mddev
->can_decrease_events
= 0;
5224 mddev
->delta_disks
= 0;
5225 mddev
->reshape_backwards
= 0;
5226 mddev
->new_level
= LEVEL_NONE
;
5227 mddev
->new_layout
= 0;
5228 mddev
->new_chunk_sectors
= 0;
5229 mddev
->curr_resync
= 0;
5230 atomic64_set(&mddev
->resync_mismatches
, 0);
5231 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5232 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5233 mddev
->recovery
= 0;
5236 mddev
->degraded
= 0;
5237 mddev
->safemode
= 0;
5238 mddev
->merge_check_needed
= 0;
5239 mddev
->bitmap_info
.offset
= 0;
5240 mddev
->bitmap_info
.default_offset
= 0;
5241 mddev
->bitmap_info
.default_space
= 0;
5242 mddev
->bitmap_info
.chunksize
= 0;
5243 mddev
->bitmap_info
.daemon_sleep
= 0;
5244 mddev
->bitmap_info
.max_write_behind
= 0;
5247 static void __md_stop_writes(struct mddev
*mddev
)
5249 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5250 if (mddev
->sync_thread
) {
5251 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5252 md_reap_sync_thread(mddev
);
5255 del_timer_sync(&mddev
->safemode_timer
);
5257 bitmap_flush(mddev
);
5258 md_super_wait(mddev
);
5260 if (mddev
->ro
== 0 &&
5261 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5262 /* mark array as shutdown cleanly */
5264 md_update_sb(mddev
, 1);
5268 void md_stop_writes(struct mddev
*mddev
)
5270 mddev_lock_nointr(mddev
);
5271 __md_stop_writes(mddev
);
5272 mddev_unlock(mddev
);
5274 EXPORT_SYMBOL_GPL(md_stop_writes
);
5276 static void __md_stop(struct mddev
*mddev
)
5279 mddev
->pers
->stop(mddev
);
5280 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5281 mddev
->to_remove
= &md_redundancy_group
;
5282 module_put(mddev
->pers
->owner
);
5284 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5287 void md_stop(struct mddev
*mddev
)
5289 /* stop the array and free an attached data structures.
5290 * This is called from dm-raid
5293 bitmap_destroy(mddev
);
5295 bioset_free(mddev
->bio_set
);
5298 EXPORT_SYMBOL_GPL(md_stop
);
5300 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5305 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5307 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5308 md_wakeup_thread(mddev
->thread
);
5310 if (mddev
->sync_thread
) {
5311 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5312 /* Thread might be blocked waiting for metadata update
5313 * which will now never happen */
5314 wake_up_process(mddev
->sync_thread
->tsk
);
5316 mddev_unlock(mddev
);
5317 wait_event(resync_wait
, mddev
->sync_thread
== NULL
);
5318 mddev_lock_nointr(mddev
);
5320 mutex_lock(&mddev
->open_mutex
);
5321 if (atomic_read(&mddev
->openers
) > !!bdev
||
5322 mddev
->sync_thread
||
5323 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5324 printk("md: %s still in use.\n",mdname(mddev
));
5326 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5327 md_wakeup_thread(mddev
->thread
);
5333 __md_stop_writes(mddev
);
5339 set_disk_ro(mddev
->gendisk
, 1);
5340 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5341 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5345 mutex_unlock(&mddev
->open_mutex
);
5350 * 0 - completely stop and dis-assemble array
5351 * 2 - stop but do not disassemble array
5353 static int do_md_stop(struct mddev
* mddev
, int mode
,
5354 struct block_device
*bdev
)
5356 struct gendisk
*disk
= mddev
->gendisk
;
5357 struct md_rdev
*rdev
;
5360 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5362 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5363 md_wakeup_thread(mddev
->thread
);
5365 if (mddev
->sync_thread
) {
5366 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5367 /* Thread might be blocked waiting for metadata update
5368 * which will now never happen */
5369 wake_up_process(mddev
->sync_thread
->tsk
);
5371 mddev_unlock(mddev
);
5372 wait_event(resync_wait
, mddev
->sync_thread
== NULL
);
5373 mddev_lock_nointr(mddev
);
5375 mutex_lock(&mddev
->open_mutex
);
5376 if (atomic_read(&mddev
->openers
) > !!bdev
||
5377 mddev
->sysfs_active
||
5378 mddev
->sync_thread
||
5379 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5380 printk("md: %s still in use.\n",mdname(mddev
));
5381 mutex_unlock(&mddev
->open_mutex
);
5383 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5384 md_wakeup_thread(mddev
->thread
);
5390 set_disk_ro(disk
, 0);
5392 __md_stop_writes(mddev
);
5394 mddev
->queue
->merge_bvec_fn
= NULL
;
5395 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5397 /* tell userspace to handle 'inactive' */
5398 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5400 rdev_for_each(rdev
, mddev
)
5401 if (rdev
->raid_disk
>= 0)
5402 sysfs_unlink_rdev(mddev
, rdev
);
5404 set_capacity(disk
, 0);
5405 mutex_unlock(&mddev
->open_mutex
);
5407 revalidate_disk(disk
);
5412 mutex_unlock(&mddev
->open_mutex
);
5414 * Free resources if final stop
5417 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5419 bitmap_destroy(mddev
);
5420 if (mddev
->bitmap_info
.file
) {
5421 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5422 fput(mddev
->bitmap_info
.file
);
5423 mddev
->bitmap_info
.file
= NULL
;
5425 mddev
->bitmap_info
.offset
= 0;
5427 export_array(mddev
);
5430 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5431 if (mddev
->hold_active
== UNTIL_STOP
)
5432 mddev
->hold_active
= 0;
5434 blk_integrity_unregister(disk
);
5435 md_new_event(mddev
);
5436 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5441 static void autorun_array(struct mddev
*mddev
)
5443 struct md_rdev
*rdev
;
5446 if (list_empty(&mddev
->disks
))
5449 printk(KERN_INFO
"md: running: ");
5451 rdev_for_each(rdev
, mddev
) {
5452 char b
[BDEVNAME_SIZE
];
5453 printk("<%s>", bdevname(rdev
->bdev
,b
));
5457 err
= do_md_run(mddev
);
5459 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5460 do_md_stop(mddev
, 0, NULL
);
5465 * lets try to run arrays based on all disks that have arrived
5466 * until now. (those are in pending_raid_disks)
5468 * the method: pick the first pending disk, collect all disks with
5469 * the same UUID, remove all from the pending list and put them into
5470 * the 'same_array' list. Then order this list based on superblock
5471 * update time (freshest comes first), kick out 'old' disks and
5472 * compare superblocks. If everything's fine then run it.
5474 * If "unit" is allocated, then bump its reference count
5476 static void autorun_devices(int part
)
5478 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5479 struct mddev
*mddev
;
5480 char b
[BDEVNAME_SIZE
];
5482 printk(KERN_INFO
"md: autorun ...\n");
5483 while (!list_empty(&pending_raid_disks
)) {
5486 LIST_HEAD(candidates
);
5487 rdev0
= list_entry(pending_raid_disks
.next
,
5488 struct md_rdev
, same_set
);
5490 printk(KERN_INFO
"md: considering %s ...\n",
5491 bdevname(rdev0
->bdev
,b
));
5492 INIT_LIST_HEAD(&candidates
);
5493 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5494 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5495 printk(KERN_INFO
"md: adding %s ...\n",
5496 bdevname(rdev
->bdev
,b
));
5497 list_move(&rdev
->same_set
, &candidates
);
5500 * now we have a set of devices, with all of them having
5501 * mostly sane superblocks. It's time to allocate the
5505 dev
= MKDEV(mdp_major
,
5506 rdev0
->preferred_minor
<< MdpMinorShift
);
5507 unit
= MINOR(dev
) >> MdpMinorShift
;
5509 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5512 if (rdev0
->preferred_minor
!= unit
) {
5513 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5514 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5518 md_probe(dev
, NULL
, NULL
);
5519 mddev
= mddev_find(dev
);
5520 if (!mddev
|| !mddev
->gendisk
) {
5524 "md: cannot allocate memory for md drive.\n");
5527 if (mddev_lock(mddev
))
5528 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5530 else if (mddev
->raid_disks
|| mddev
->major_version
5531 || !list_empty(&mddev
->disks
)) {
5533 "md: %s already running, cannot run %s\n",
5534 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5535 mddev_unlock(mddev
);
5537 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5538 mddev
->persistent
= 1;
5539 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5540 list_del_init(&rdev
->same_set
);
5541 if (bind_rdev_to_array(rdev
, mddev
))
5544 autorun_array(mddev
);
5545 mddev_unlock(mddev
);
5547 /* on success, candidates will be empty, on error
5550 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5551 list_del_init(&rdev
->same_set
);
5556 printk(KERN_INFO
"md: ... autorun DONE.\n");
5558 #endif /* !MODULE */
5560 static int get_version(void __user
* arg
)
5564 ver
.major
= MD_MAJOR_VERSION
;
5565 ver
.minor
= MD_MINOR_VERSION
;
5566 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5568 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5574 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5576 mdu_array_info_t info
;
5577 int nr
,working
,insync
,failed
,spare
;
5578 struct md_rdev
*rdev
;
5580 nr
= working
= insync
= failed
= spare
= 0;
5582 rdev_for_each_rcu(rdev
, mddev
) {
5584 if (test_bit(Faulty
, &rdev
->flags
))
5588 if (test_bit(In_sync
, &rdev
->flags
))
5596 info
.major_version
= mddev
->major_version
;
5597 info
.minor_version
= mddev
->minor_version
;
5598 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5599 info
.ctime
= mddev
->ctime
;
5600 info
.level
= mddev
->level
;
5601 info
.size
= mddev
->dev_sectors
/ 2;
5602 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5605 info
.raid_disks
= mddev
->raid_disks
;
5606 info
.md_minor
= mddev
->md_minor
;
5607 info
.not_persistent
= !mddev
->persistent
;
5609 info
.utime
= mddev
->utime
;
5612 info
.state
= (1<<MD_SB_CLEAN
);
5613 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5614 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5615 info
.active_disks
= insync
;
5616 info
.working_disks
= working
;
5617 info
.failed_disks
= failed
;
5618 info
.spare_disks
= spare
;
5620 info
.layout
= mddev
->layout
;
5621 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5623 if (copy_to_user(arg
, &info
, sizeof(info
)))
5629 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5631 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5632 char *ptr
, *buf
= NULL
;
5635 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5640 /* bitmap disabled, zero the first byte and copy out */
5641 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5642 file
->pathname
[0] = '\0';
5646 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5650 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5651 buf
, sizeof(file
->pathname
));
5655 strcpy(file
->pathname
, ptr
);
5659 if (copy_to_user(arg
, file
, sizeof(*file
)))
5667 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5669 mdu_disk_info_t info
;
5670 struct md_rdev
*rdev
;
5672 if (copy_from_user(&info
, arg
, sizeof(info
)))
5676 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5678 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5679 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5680 info
.raid_disk
= rdev
->raid_disk
;
5682 if (test_bit(Faulty
, &rdev
->flags
))
5683 info
.state
|= (1<<MD_DISK_FAULTY
);
5684 else if (test_bit(In_sync
, &rdev
->flags
)) {
5685 info
.state
|= (1<<MD_DISK_ACTIVE
);
5686 info
.state
|= (1<<MD_DISK_SYNC
);
5688 if (test_bit(WriteMostly
, &rdev
->flags
))
5689 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5691 info
.major
= info
.minor
= 0;
5692 info
.raid_disk
= -1;
5693 info
.state
= (1<<MD_DISK_REMOVED
);
5697 if (copy_to_user(arg
, &info
, sizeof(info
)))
5703 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5705 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5706 struct md_rdev
*rdev
;
5707 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5709 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5712 if (!mddev
->raid_disks
) {
5714 /* expecting a device which has a superblock */
5715 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5718 "md: md_import_device returned %ld\n",
5720 return PTR_ERR(rdev
);
5722 if (!list_empty(&mddev
->disks
)) {
5723 struct md_rdev
*rdev0
5724 = list_entry(mddev
->disks
.next
,
5725 struct md_rdev
, same_set
);
5726 err
= super_types
[mddev
->major_version
]
5727 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5730 "md: %s has different UUID to %s\n",
5731 bdevname(rdev
->bdev
,b
),
5732 bdevname(rdev0
->bdev
,b2
));
5737 err
= bind_rdev_to_array(rdev
, mddev
);
5744 * add_new_disk can be used once the array is assembled
5745 * to add "hot spares". They must already have a superblock
5750 if (!mddev
->pers
->hot_add_disk
) {
5752 "%s: personality does not support diskops!\n",
5756 if (mddev
->persistent
)
5757 rdev
= md_import_device(dev
, mddev
->major_version
,
5758 mddev
->minor_version
);
5760 rdev
= md_import_device(dev
, -1, -1);
5763 "md: md_import_device returned %ld\n",
5765 return PTR_ERR(rdev
);
5767 /* set saved_raid_disk if appropriate */
5768 if (!mddev
->persistent
) {
5769 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5770 info
->raid_disk
< mddev
->raid_disks
) {
5771 rdev
->raid_disk
= info
->raid_disk
;
5772 set_bit(In_sync
, &rdev
->flags
);
5774 rdev
->raid_disk
= -1;
5776 super_types
[mddev
->major_version
].
5777 validate_super(mddev
, rdev
);
5778 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5779 rdev
->raid_disk
!= info
->raid_disk
) {
5780 /* This was a hot-add request, but events doesn't
5781 * match, so reject it.
5787 if (test_bit(In_sync
, &rdev
->flags
))
5788 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5790 rdev
->saved_raid_disk
= -1;
5792 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5793 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5794 set_bit(WriteMostly
, &rdev
->flags
);
5796 clear_bit(WriteMostly
, &rdev
->flags
);
5798 rdev
->raid_disk
= -1;
5799 err
= bind_rdev_to_array(rdev
, mddev
);
5800 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5801 /* If there is hot_add_disk but no hot_remove_disk
5802 * then added disks for geometry changes,
5803 * and should be added immediately.
5805 super_types
[mddev
->major_version
].
5806 validate_super(mddev
, rdev
);
5807 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5809 unbind_rdev_from_array(rdev
);
5814 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5816 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5817 if (mddev
->degraded
)
5818 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5819 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5821 md_new_event(mddev
);
5822 md_wakeup_thread(mddev
->thread
);
5826 /* otherwise, add_new_disk is only allowed
5827 * for major_version==0 superblocks
5829 if (mddev
->major_version
!= 0) {
5830 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5835 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5837 rdev
= md_import_device(dev
, -1, 0);
5840 "md: error, md_import_device() returned %ld\n",
5842 return PTR_ERR(rdev
);
5844 rdev
->desc_nr
= info
->number
;
5845 if (info
->raid_disk
< mddev
->raid_disks
)
5846 rdev
->raid_disk
= info
->raid_disk
;
5848 rdev
->raid_disk
= -1;
5850 if (rdev
->raid_disk
< mddev
->raid_disks
)
5851 if (info
->state
& (1<<MD_DISK_SYNC
))
5852 set_bit(In_sync
, &rdev
->flags
);
5854 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5855 set_bit(WriteMostly
, &rdev
->flags
);
5857 if (!mddev
->persistent
) {
5858 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5859 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5861 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5862 rdev
->sectors
= rdev
->sb_start
;
5864 err
= bind_rdev_to_array(rdev
, mddev
);
5874 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5876 char b
[BDEVNAME_SIZE
];
5877 struct md_rdev
*rdev
;
5879 rdev
= find_rdev(mddev
, dev
);
5883 clear_bit(Blocked
, &rdev
->flags
);
5884 remove_and_add_spares(mddev
, rdev
);
5886 if (rdev
->raid_disk
>= 0)
5889 kick_rdev_from_array(rdev
);
5890 md_update_sb(mddev
, 1);
5891 md_new_event(mddev
);
5895 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5896 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5900 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5902 char b
[BDEVNAME_SIZE
];
5904 struct md_rdev
*rdev
;
5909 if (mddev
->major_version
!= 0) {
5910 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5911 " version-0 superblocks.\n",
5915 if (!mddev
->pers
->hot_add_disk
) {
5917 "%s: personality does not support diskops!\n",
5922 rdev
= md_import_device(dev
, -1, 0);
5925 "md: error, md_import_device() returned %ld\n",
5930 if (mddev
->persistent
)
5931 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5933 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5935 rdev
->sectors
= rdev
->sb_start
;
5937 if (test_bit(Faulty
, &rdev
->flags
)) {
5939 "md: can not hot-add faulty %s disk to %s!\n",
5940 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5944 clear_bit(In_sync
, &rdev
->flags
);
5946 rdev
->saved_raid_disk
= -1;
5947 err
= bind_rdev_to_array(rdev
, mddev
);
5952 * The rest should better be atomic, we can have disk failures
5953 * noticed in interrupt contexts ...
5956 rdev
->raid_disk
= -1;
5958 md_update_sb(mddev
, 1);
5961 * Kick recovery, maybe this spare has to be added to the
5962 * array immediately.
5964 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5965 md_wakeup_thread(mddev
->thread
);
5966 md_new_event(mddev
);
5974 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5979 if (!mddev
->pers
->quiesce
)
5981 if (mddev
->recovery
|| mddev
->sync_thread
)
5983 /* we should be able to change the bitmap.. */
5989 return -EEXIST
; /* cannot add when bitmap is present */
5990 mddev
->bitmap_info
.file
= fget(fd
);
5992 if (mddev
->bitmap_info
.file
== NULL
) {
5993 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5998 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
6000 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6002 fput(mddev
->bitmap_info
.file
);
6003 mddev
->bitmap_info
.file
= NULL
;
6006 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6007 } else if (mddev
->bitmap
== NULL
)
6008 return -ENOENT
; /* cannot remove what isn't there */
6011 mddev
->pers
->quiesce(mddev
, 1);
6013 err
= bitmap_create(mddev
);
6015 err
= bitmap_load(mddev
);
6017 if (fd
< 0 || err
) {
6018 bitmap_destroy(mddev
);
6019 fd
= -1; /* make sure to put the file */
6021 mddev
->pers
->quiesce(mddev
, 0);
6024 if (mddev
->bitmap_info
.file
) {
6025 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
6026 fput(mddev
->bitmap_info
.file
);
6028 mddev
->bitmap_info
.file
= NULL
;
6035 * set_array_info is used two different ways
6036 * The original usage is when creating a new array.
6037 * In this usage, raid_disks is > 0 and it together with
6038 * level, size, not_persistent,layout,chunksize determine the
6039 * shape of the array.
6040 * This will always create an array with a type-0.90.0 superblock.
6041 * The newer usage is when assembling an array.
6042 * In this case raid_disks will be 0, and the major_version field is
6043 * use to determine which style super-blocks are to be found on the devices.
6044 * The minor and patch _version numbers are also kept incase the
6045 * super_block handler wishes to interpret them.
6047 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6050 if (info
->raid_disks
== 0) {
6051 /* just setting version number for superblock loading */
6052 if (info
->major_version
< 0 ||
6053 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6054 super_types
[info
->major_version
].name
== NULL
) {
6055 /* maybe try to auto-load a module? */
6057 "md: superblock version %d not known\n",
6058 info
->major_version
);
6061 mddev
->major_version
= info
->major_version
;
6062 mddev
->minor_version
= info
->minor_version
;
6063 mddev
->patch_version
= info
->patch_version
;
6064 mddev
->persistent
= !info
->not_persistent
;
6065 /* ensure mddev_put doesn't delete this now that there
6066 * is some minimal configuration.
6068 mddev
->ctime
= get_seconds();
6071 mddev
->major_version
= MD_MAJOR_VERSION
;
6072 mddev
->minor_version
= MD_MINOR_VERSION
;
6073 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6074 mddev
->ctime
= get_seconds();
6076 mddev
->level
= info
->level
;
6077 mddev
->clevel
[0] = 0;
6078 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6079 mddev
->raid_disks
= info
->raid_disks
;
6080 /* don't set md_minor, it is determined by which /dev/md* was
6083 if (info
->state
& (1<<MD_SB_CLEAN
))
6084 mddev
->recovery_cp
= MaxSector
;
6086 mddev
->recovery_cp
= 0;
6087 mddev
->persistent
= ! info
->not_persistent
;
6088 mddev
->external
= 0;
6090 mddev
->layout
= info
->layout
;
6091 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6093 mddev
->max_disks
= MD_SB_DISKS
;
6095 if (mddev
->persistent
)
6097 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6099 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6100 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6101 mddev
->bitmap_info
.offset
= 0;
6103 mddev
->reshape_position
= MaxSector
;
6106 * Generate a 128 bit UUID
6108 get_random_bytes(mddev
->uuid
, 16);
6110 mddev
->new_level
= mddev
->level
;
6111 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6112 mddev
->new_layout
= mddev
->layout
;
6113 mddev
->delta_disks
= 0;
6114 mddev
->reshape_backwards
= 0;
6119 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6121 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6123 if (mddev
->external_size
)
6126 mddev
->array_sectors
= array_sectors
;
6128 EXPORT_SYMBOL(md_set_array_sectors
);
6130 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6132 struct md_rdev
*rdev
;
6134 int fit
= (num_sectors
== 0);
6136 if (mddev
->pers
->resize
== NULL
)
6138 /* The "num_sectors" is the number of sectors of each device that
6139 * is used. This can only make sense for arrays with redundancy.
6140 * linear and raid0 always use whatever space is available. We can only
6141 * consider changing this number if no resync or reconstruction is
6142 * happening, and if the new size is acceptable. It must fit before the
6143 * sb_start or, if that is <data_offset, it must fit before the size
6144 * of each device. If num_sectors is zero, we find the largest size
6147 if (mddev
->sync_thread
)
6150 rdev_for_each(rdev
, mddev
) {
6151 sector_t avail
= rdev
->sectors
;
6153 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6154 num_sectors
= avail
;
6155 if (avail
< num_sectors
)
6158 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6160 revalidate_disk(mddev
->gendisk
);
6164 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6167 struct md_rdev
*rdev
;
6168 /* change the number of raid disks */
6169 if (mddev
->pers
->check_reshape
== NULL
)
6171 if (raid_disks
<= 0 ||
6172 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6174 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6177 rdev_for_each(rdev
, mddev
) {
6178 if (mddev
->raid_disks
< raid_disks
&&
6179 rdev
->data_offset
< rdev
->new_data_offset
)
6181 if (mddev
->raid_disks
> raid_disks
&&
6182 rdev
->data_offset
> rdev
->new_data_offset
)
6186 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6187 if (mddev
->delta_disks
< 0)
6188 mddev
->reshape_backwards
= 1;
6189 else if (mddev
->delta_disks
> 0)
6190 mddev
->reshape_backwards
= 0;
6192 rv
= mddev
->pers
->check_reshape(mddev
);
6194 mddev
->delta_disks
= 0;
6195 mddev
->reshape_backwards
= 0;
6202 * update_array_info is used to change the configuration of an
6204 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6205 * fields in the info are checked against the array.
6206 * Any differences that cannot be handled will cause an error.
6207 * Normally, only one change can be managed at a time.
6209 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6215 /* calculate expected state,ignoring low bits */
6216 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6217 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6219 if (mddev
->major_version
!= info
->major_version
||
6220 mddev
->minor_version
!= info
->minor_version
||
6221 /* mddev->patch_version != info->patch_version || */
6222 mddev
->ctime
!= info
->ctime
||
6223 mddev
->level
!= info
->level
||
6224 /* mddev->layout != info->layout || */
6225 !mddev
->persistent
!= info
->not_persistent
||
6226 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6227 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6228 ((state
^info
->state
) & 0xfffffe00)
6231 /* Check there is only one change */
6232 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6234 if (mddev
->raid_disks
!= info
->raid_disks
)
6236 if (mddev
->layout
!= info
->layout
)
6238 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6245 if (mddev
->layout
!= info
->layout
) {
6247 * we don't need to do anything at the md level, the
6248 * personality will take care of it all.
6250 if (mddev
->pers
->check_reshape
== NULL
)
6253 mddev
->new_layout
= info
->layout
;
6254 rv
= mddev
->pers
->check_reshape(mddev
);
6256 mddev
->new_layout
= mddev
->layout
;
6260 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6261 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6263 if (mddev
->raid_disks
!= info
->raid_disks
)
6264 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6266 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6267 if (mddev
->pers
->quiesce
== NULL
)
6269 if (mddev
->recovery
|| mddev
->sync_thread
)
6271 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6272 /* add the bitmap */
6275 if (mddev
->bitmap_info
.default_offset
== 0)
6277 mddev
->bitmap_info
.offset
=
6278 mddev
->bitmap_info
.default_offset
;
6279 mddev
->bitmap_info
.space
=
6280 mddev
->bitmap_info
.default_space
;
6281 mddev
->pers
->quiesce(mddev
, 1);
6282 rv
= bitmap_create(mddev
);
6284 rv
= bitmap_load(mddev
);
6286 bitmap_destroy(mddev
);
6287 mddev
->pers
->quiesce(mddev
, 0);
6289 /* remove the bitmap */
6292 if (mddev
->bitmap
->storage
.file
)
6294 mddev
->pers
->quiesce(mddev
, 1);
6295 bitmap_destroy(mddev
);
6296 mddev
->pers
->quiesce(mddev
, 0);
6297 mddev
->bitmap_info
.offset
= 0;
6300 md_update_sb(mddev
, 1);
6304 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6306 struct md_rdev
*rdev
;
6309 if (mddev
->pers
== NULL
)
6313 rdev
= find_rdev_rcu(mddev
, dev
);
6317 md_error(mddev
, rdev
);
6318 if (!test_bit(Faulty
, &rdev
->flags
))
6326 * We have a problem here : there is no easy way to give a CHS
6327 * virtual geometry. We currently pretend that we have a 2 heads
6328 * 4 sectors (with a BIG number of cylinders...). This drives
6329 * dosfs just mad... ;-)
6331 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6333 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6337 geo
->cylinders
= mddev
->array_sectors
/ 8;
6341 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6342 unsigned int cmd
, unsigned long arg
)
6345 void __user
*argp
= (void __user
*)arg
;
6346 struct mddev
*mddev
= NULL
;
6351 case GET_ARRAY_INFO
:
6355 if (!capable(CAP_SYS_ADMIN
))
6360 * Commands dealing with the RAID driver but not any
6365 err
= get_version(argp
);
6368 case PRINT_RAID_DEBUG
:
6376 autostart_arrays(arg
);
6383 * Commands creating/starting a new array:
6386 mddev
= bdev
->bd_disk
->private_data
;
6393 /* Some actions do not requires the mutex */
6395 case GET_ARRAY_INFO
:
6396 if (!mddev
->raid_disks
&& !mddev
->external
)
6399 err
= get_array_info(mddev
, argp
);
6403 if (!mddev
->raid_disks
&& !mddev
->external
)
6406 err
= get_disk_info(mddev
, argp
);
6409 case SET_DISK_FAULTY
:
6410 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6414 if (cmd
== ADD_NEW_DISK
)
6415 /* need to ensure md_delayed_delete() has completed */
6416 flush_workqueue(md_misc_wq
);
6418 if (cmd
== HOT_REMOVE_DISK
)
6419 /* need to ensure recovery thread has run */
6420 wait_event_interruptible_timeout(mddev
->sb_wait
,
6421 !test_bit(MD_RECOVERY_NEEDED
,
6423 msecs_to_jiffies(5000));
6424 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6425 /* Need to flush page cache, and ensure no-one else opens
6428 mutex_lock(&mddev
->open_mutex
);
6429 if (atomic_read(&mddev
->openers
) > 1) {
6430 mutex_unlock(&mddev
->open_mutex
);
6434 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6435 mutex_unlock(&mddev
->open_mutex
);
6436 sync_blockdev(bdev
);
6438 err
= mddev_lock(mddev
);
6441 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6446 if (cmd
== SET_ARRAY_INFO
) {
6447 mdu_array_info_t info
;
6449 memset(&info
, 0, sizeof(info
));
6450 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6455 err
= update_array_info(mddev
, &info
);
6457 printk(KERN_WARNING
"md: couldn't update"
6458 " array info. %d\n", err
);
6463 if (!list_empty(&mddev
->disks
)) {
6465 "md: array %s already has disks!\n",
6470 if (mddev
->raid_disks
) {
6472 "md: array %s already initialised!\n",
6477 err
= set_array_info(mddev
, &info
);
6479 printk(KERN_WARNING
"md: couldn't set"
6480 " array info. %d\n", err
);
6487 * Commands querying/configuring an existing array:
6489 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6490 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6491 if ((!mddev
->raid_disks
&& !mddev
->external
)
6492 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6493 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6494 && cmd
!= GET_BITMAP_FILE
) {
6500 * Commands even a read-only array can execute:
6503 case GET_BITMAP_FILE
:
6504 err
= get_bitmap_file(mddev
, argp
);
6507 case RESTART_ARRAY_RW
:
6508 err
= restart_array(mddev
);
6512 err
= do_md_stop(mddev
, 0, bdev
);
6516 err
= md_set_readonly(mddev
, bdev
);
6519 case HOT_REMOVE_DISK
:
6520 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6524 /* We can support ADD_NEW_DISK on read-only arrays
6525 * on if we are re-adding a preexisting device.
6526 * So require mddev->pers and MD_DISK_SYNC.
6529 mdu_disk_info_t info
;
6530 if (copy_from_user(&info
, argp
, sizeof(info
)))
6532 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6533 /* Need to clear read-only for this */
6536 err
= add_new_disk(mddev
, &info
);
6542 if (get_user(ro
, (int __user
*)(arg
))) {
6548 /* if the bdev is going readonly the value of mddev->ro
6549 * does not matter, no writes are coming
6554 /* are we are already prepared for writes? */
6558 /* transitioning to readauto need only happen for
6559 * arrays that call md_write_start
6562 err
= restart_array(mddev
);
6565 set_disk_ro(mddev
->gendisk
, 0);
6572 * The remaining ioctls are changing the state of the
6573 * superblock, so we do not allow them on read-only arrays.
6574 * However non-MD ioctls (e.g. get-size) will still come through
6575 * here and hit the 'default' below, so only disallow
6576 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6578 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6579 if (mddev
->ro
== 2) {
6581 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6582 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6583 /* mddev_unlock will wake thread */
6584 /* If a device failed while we were read-only, we
6585 * need to make sure the metadata is updated now.
6587 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6588 mddev_unlock(mddev
);
6589 wait_event(mddev
->sb_wait
,
6590 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6591 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6592 mddev_lock_nointr(mddev
);
6603 mdu_disk_info_t info
;
6604 if (copy_from_user(&info
, argp
, sizeof(info
)))
6607 err
= add_new_disk(mddev
, &info
);
6612 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6616 err
= do_md_run(mddev
);
6619 case SET_BITMAP_FILE
:
6620 err
= set_bitmap_file(mddev
, (int)arg
);
6630 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6632 mddev
->hold_active
= 0;
6633 mddev_unlock(mddev
);
6642 #ifdef CONFIG_COMPAT
6643 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6644 unsigned int cmd
, unsigned long arg
)
6647 case HOT_REMOVE_DISK
:
6649 case SET_DISK_FAULTY
:
6650 case SET_BITMAP_FILE
:
6651 /* These take in integer arg, do not convert */
6654 arg
= (unsigned long)compat_ptr(arg
);
6658 return md_ioctl(bdev
, mode
, cmd
, arg
);
6660 #endif /* CONFIG_COMPAT */
6662 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6665 * Succeed if we can lock the mddev, which confirms that
6666 * it isn't being stopped right now.
6668 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6674 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6675 /* we are racing with mddev_put which is discarding this
6679 /* Wait until bdev->bd_disk is definitely gone */
6680 flush_workqueue(md_misc_wq
);
6681 /* Then retry the open from the top */
6682 return -ERESTARTSYS
;
6684 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6686 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6690 atomic_inc(&mddev
->openers
);
6691 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6692 mutex_unlock(&mddev
->open_mutex
);
6694 check_disk_change(bdev
);
6699 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6701 struct mddev
*mddev
= disk
->private_data
;
6704 atomic_dec(&mddev
->openers
);
6708 static int md_media_changed(struct gendisk
*disk
)
6710 struct mddev
*mddev
= disk
->private_data
;
6712 return mddev
->changed
;
6715 static int md_revalidate(struct gendisk
*disk
)
6717 struct mddev
*mddev
= disk
->private_data
;
6722 static const struct block_device_operations md_fops
=
6724 .owner
= THIS_MODULE
,
6726 .release
= md_release
,
6728 #ifdef CONFIG_COMPAT
6729 .compat_ioctl
= md_compat_ioctl
,
6731 .getgeo
= md_getgeo
,
6732 .media_changed
= md_media_changed
,
6733 .revalidate_disk
= md_revalidate
,
6736 static int md_thread(void * arg
)
6738 struct md_thread
*thread
= arg
;
6741 * md_thread is a 'system-thread', it's priority should be very
6742 * high. We avoid resource deadlocks individually in each
6743 * raid personality. (RAID5 does preallocation) We also use RR and
6744 * the very same RT priority as kswapd, thus we will never get
6745 * into a priority inversion deadlock.
6747 * we definitely have to have equal or higher priority than
6748 * bdflush, otherwise bdflush will deadlock if there are too
6749 * many dirty RAID5 blocks.
6752 allow_signal(SIGKILL
);
6753 while (!kthread_should_stop()) {
6755 /* We need to wait INTERRUPTIBLE so that
6756 * we don't add to the load-average.
6757 * That means we need to be sure no signals are
6760 if (signal_pending(current
))
6761 flush_signals(current
);
6763 wait_event_interruptible_timeout
6765 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6766 || kthread_should_stop(),
6769 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6770 if (!kthread_should_stop())
6771 thread
->run(thread
);
6777 void md_wakeup_thread(struct md_thread
*thread
)
6780 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6781 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6782 wake_up(&thread
->wqueue
);
6786 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6787 struct mddev
*mddev
, const char *name
)
6789 struct md_thread
*thread
;
6791 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6795 init_waitqueue_head(&thread
->wqueue
);
6798 thread
->mddev
= mddev
;
6799 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6800 thread
->tsk
= kthread_run(md_thread
, thread
,
6802 mdname(thread
->mddev
),
6804 if (IS_ERR(thread
->tsk
)) {
6811 void md_unregister_thread(struct md_thread
**threadp
)
6813 struct md_thread
*thread
= *threadp
;
6816 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6817 /* Locking ensures that mddev_unlock does not wake_up a
6818 * non-existent thread
6820 spin_lock(&pers_lock
);
6822 spin_unlock(&pers_lock
);
6824 kthread_stop(thread
->tsk
);
6828 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6835 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6838 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6840 mddev
->pers
->error_handler(mddev
,rdev
);
6841 if (mddev
->degraded
)
6842 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6843 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6844 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6845 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6846 md_wakeup_thread(mddev
->thread
);
6847 if (mddev
->event_work
.func
)
6848 queue_work(md_misc_wq
, &mddev
->event_work
);
6849 md_new_event_inintr(mddev
);
6852 /* seq_file implementation /proc/mdstat */
6854 static void status_unused(struct seq_file
*seq
)
6857 struct md_rdev
*rdev
;
6859 seq_printf(seq
, "unused devices: ");
6861 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6862 char b
[BDEVNAME_SIZE
];
6864 seq_printf(seq
, "%s ",
6865 bdevname(rdev
->bdev
,b
));
6868 seq_printf(seq
, "<none>");
6870 seq_printf(seq
, "\n");
6874 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6876 sector_t max_sectors
, resync
, res
;
6877 unsigned long dt
, db
;
6880 unsigned int per_milli
;
6882 if (mddev
->curr_resync
<= 3)
6885 resync
= mddev
->curr_resync
6886 - atomic_read(&mddev
->recovery_active
);
6888 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6889 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6890 max_sectors
= mddev
->resync_max_sectors
;
6892 max_sectors
= mddev
->dev_sectors
;
6895 * Should not happen.
6901 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6902 * in a sector_t, and (max_sectors>>scale) will fit in a
6903 * u32, as those are the requirements for sector_div.
6904 * Thus 'scale' must be at least 10
6907 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6908 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6911 res
= (resync
>>scale
)*1000;
6912 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6916 int i
, x
= per_milli
/50, y
= 20-x
;
6917 seq_printf(seq
, "[");
6918 for (i
= 0; i
< x
; i
++)
6919 seq_printf(seq
, "=");
6920 seq_printf(seq
, ">");
6921 for (i
= 0; i
< y
; i
++)
6922 seq_printf(seq
, ".");
6923 seq_printf(seq
, "] ");
6925 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6926 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6928 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6930 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6931 "resync" : "recovery"))),
6932 per_milli
/10, per_milli
% 10,
6933 (unsigned long long) resync
/2,
6934 (unsigned long long) max_sectors
/2);
6937 * dt: time from mark until now
6938 * db: blocks written from mark until now
6939 * rt: remaining time
6941 * rt is a sector_t, so could be 32bit or 64bit.
6942 * So we divide before multiply in case it is 32bit and close
6944 * We scale the divisor (db) by 32 to avoid losing precision
6945 * near the end of resync when the number of remaining sectors
6947 * We then divide rt by 32 after multiplying by db to compensate.
6948 * The '+1' avoids division by zero if db is very small.
6950 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6952 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6953 - mddev
->resync_mark_cnt
;
6955 rt
= max_sectors
- resync
; /* number of remaining sectors */
6956 sector_div(rt
, db
/32+1);
6960 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6961 ((unsigned long)rt
% 60)/6);
6963 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6966 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6968 struct list_head
*tmp
;
6970 struct mddev
*mddev
;
6978 spin_lock(&all_mddevs_lock
);
6979 list_for_each(tmp
,&all_mddevs
)
6981 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6983 spin_unlock(&all_mddevs_lock
);
6986 spin_unlock(&all_mddevs_lock
);
6988 return (void*)2;/* tail */
6992 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6994 struct list_head
*tmp
;
6995 struct mddev
*next_mddev
, *mddev
= v
;
7001 spin_lock(&all_mddevs_lock
);
7003 tmp
= all_mddevs
.next
;
7005 tmp
= mddev
->all_mddevs
.next
;
7006 if (tmp
!= &all_mddevs
)
7007 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7009 next_mddev
= (void*)2;
7012 spin_unlock(&all_mddevs_lock
);
7020 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7022 struct mddev
*mddev
= v
;
7024 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7028 static int md_seq_show(struct seq_file
*seq
, void *v
)
7030 struct mddev
*mddev
= v
;
7032 struct md_rdev
*rdev
;
7034 if (v
== (void*)1) {
7035 struct md_personality
*pers
;
7036 seq_printf(seq
, "Personalities : ");
7037 spin_lock(&pers_lock
);
7038 list_for_each_entry(pers
, &pers_list
, list
)
7039 seq_printf(seq
, "[%s] ", pers
->name
);
7041 spin_unlock(&pers_lock
);
7042 seq_printf(seq
, "\n");
7043 seq
->poll_event
= atomic_read(&md_event_count
);
7046 if (v
== (void*)2) {
7051 if (mddev_lock(mddev
) < 0)
7054 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7055 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7056 mddev
->pers
? "" : "in");
7059 seq_printf(seq
, " (read-only)");
7061 seq_printf(seq
, " (auto-read-only)");
7062 seq_printf(seq
, " %s", mddev
->pers
->name
);
7066 rdev_for_each(rdev
, mddev
) {
7067 char b
[BDEVNAME_SIZE
];
7068 seq_printf(seq
, " %s[%d]",
7069 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7070 if (test_bit(WriteMostly
, &rdev
->flags
))
7071 seq_printf(seq
, "(W)");
7072 if (test_bit(Faulty
, &rdev
->flags
)) {
7073 seq_printf(seq
, "(F)");
7076 if (rdev
->raid_disk
< 0)
7077 seq_printf(seq
, "(S)"); /* spare */
7078 if (test_bit(Replacement
, &rdev
->flags
))
7079 seq_printf(seq
, "(R)");
7080 sectors
+= rdev
->sectors
;
7083 if (!list_empty(&mddev
->disks
)) {
7085 seq_printf(seq
, "\n %llu blocks",
7086 (unsigned long long)
7087 mddev
->array_sectors
/ 2);
7089 seq_printf(seq
, "\n %llu blocks",
7090 (unsigned long long)sectors
/ 2);
7092 if (mddev
->persistent
) {
7093 if (mddev
->major_version
!= 0 ||
7094 mddev
->minor_version
!= 90) {
7095 seq_printf(seq
," super %d.%d",
7096 mddev
->major_version
,
7097 mddev
->minor_version
);
7099 } else if (mddev
->external
)
7100 seq_printf(seq
, " super external:%s",
7101 mddev
->metadata_type
);
7103 seq_printf(seq
, " super non-persistent");
7106 mddev
->pers
->status(seq
, mddev
);
7107 seq_printf(seq
, "\n ");
7108 if (mddev
->pers
->sync_request
) {
7109 if (mddev
->curr_resync
> 2) {
7110 status_resync(seq
, mddev
);
7111 seq_printf(seq
, "\n ");
7112 } else if (mddev
->curr_resync
>= 1)
7113 seq_printf(seq
, "\tresync=DELAYED\n ");
7114 else if (mddev
->recovery_cp
< MaxSector
)
7115 seq_printf(seq
, "\tresync=PENDING\n ");
7118 seq_printf(seq
, "\n ");
7120 bitmap_status(seq
, mddev
->bitmap
);
7122 seq_printf(seq
, "\n");
7124 mddev_unlock(mddev
);
7129 static const struct seq_operations md_seq_ops
= {
7130 .start
= md_seq_start
,
7131 .next
= md_seq_next
,
7132 .stop
= md_seq_stop
,
7133 .show
= md_seq_show
,
7136 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7138 struct seq_file
*seq
;
7141 error
= seq_open(file
, &md_seq_ops
);
7145 seq
= file
->private_data
;
7146 seq
->poll_event
= atomic_read(&md_event_count
);
7150 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7152 struct seq_file
*seq
= filp
->private_data
;
7155 poll_wait(filp
, &md_event_waiters
, wait
);
7157 /* always allow read */
7158 mask
= POLLIN
| POLLRDNORM
;
7160 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7161 mask
|= POLLERR
| POLLPRI
;
7165 static const struct file_operations md_seq_fops
= {
7166 .owner
= THIS_MODULE
,
7167 .open
= md_seq_open
,
7169 .llseek
= seq_lseek
,
7170 .release
= seq_release_private
,
7171 .poll
= mdstat_poll
,
7174 int register_md_personality(struct md_personality
*p
)
7176 spin_lock(&pers_lock
);
7177 list_add_tail(&p
->list
, &pers_list
);
7178 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7179 spin_unlock(&pers_lock
);
7183 int unregister_md_personality(struct md_personality
*p
)
7185 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7186 spin_lock(&pers_lock
);
7187 list_del_init(&p
->list
);
7188 spin_unlock(&pers_lock
);
7192 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7194 struct md_rdev
* rdev
;
7200 rdev_for_each_rcu(rdev
, mddev
) {
7201 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7202 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7203 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7204 atomic_read(&disk
->sync_io
);
7205 /* sync IO will cause sync_io to increase before the disk_stats
7206 * as sync_io is counted when a request starts, and
7207 * disk_stats is counted when it completes.
7208 * So resync activity will cause curr_events to be smaller than
7209 * when there was no such activity.
7210 * non-sync IO will cause disk_stat to increase without
7211 * increasing sync_io so curr_events will (eventually)
7212 * be larger than it was before. Once it becomes
7213 * substantially larger, the test below will cause
7214 * the array to appear non-idle, and resync will slow
7216 * If there is a lot of outstanding resync activity when
7217 * we set last_event to curr_events, then all that activity
7218 * completing might cause the array to appear non-idle
7219 * and resync will be slowed down even though there might
7220 * not have been non-resync activity. This will only
7221 * happen once though. 'last_events' will soon reflect
7222 * the state where there is little or no outstanding
7223 * resync requests, and further resync activity will
7224 * always make curr_events less than last_events.
7227 if (init
|| curr_events
- rdev
->last_events
> 64) {
7228 rdev
->last_events
= curr_events
;
7236 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7238 /* another "blocks" (512byte) blocks have been synced */
7239 atomic_sub(blocks
, &mddev
->recovery_active
);
7240 wake_up(&mddev
->recovery_wait
);
7242 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7243 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7244 md_wakeup_thread(mddev
->thread
);
7245 // stop recovery, signal do_sync ....
7250 /* md_write_start(mddev, bi)
7251 * If we need to update some array metadata (e.g. 'active' flag
7252 * in superblock) before writing, schedule a superblock update
7253 * and wait for it to complete.
7255 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7258 if (bio_data_dir(bi
) != WRITE
)
7261 BUG_ON(mddev
->ro
== 1);
7262 if (mddev
->ro
== 2) {
7263 /* need to switch to read/write */
7265 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7266 md_wakeup_thread(mddev
->thread
);
7267 md_wakeup_thread(mddev
->sync_thread
);
7270 atomic_inc(&mddev
->writes_pending
);
7271 if (mddev
->safemode
== 1)
7272 mddev
->safemode
= 0;
7273 if (mddev
->in_sync
) {
7274 spin_lock_irq(&mddev
->write_lock
);
7275 if (mddev
->in_sync
) {
7277 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7278 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7279 md_wakeup_thread(mddev
->thread
);
7282 spin_unlock_irq(&mddev
->write_lock
);
7285 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7286 wait_event(mddev
->sb_wait
,
7287 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7290 void md_write_end(struct mddev
*mddev
)
7292 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7293 if (mddev
->safemode
== 2)
7294 md_wakeup_thread(mddev
->thread
);
7295 else if (mddev
->safemode_delay
)
7296 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7300 /* md_allow_write(mddev)
7301 * Calling this ensures that the array is marked 'active' so that writes
7302 * may proceed without blocking. It is important to call this before
7303 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7304 * Must be called with mddev_lock held.
7306 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7307 * is dropped, so return -EAGAIN after notifying userspace.
7309 int md_allow_write(struct mddev
*mddev
)
7315 if (!mddev
->pers
->sync_request
)
7318 spin_lock_irq(&mddev
->write_lock
);
7319 if (mddev
->in_sync
) {
7321 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7322 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7323 if (mddev
->safemode_delay
&&
7324 mddev
->safemode
== 0)
7325 mddev
->safemode
= 1;
7326 spin_unlock_irq(&mddev
->write_lock
);
7327 md_update_sb(mddev
, 0);
7328 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7330 spin_unlock_irq(&mddev
->write_lock
);
7332 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7337 EXPORT_SYMBOL_GPL(md_allow_write
);
7339 #define SYNC_MARKS 10
7340 #define SYNC_MARK_STEP (3*HZ)
7341 #define UPDATE_FREQUENCY (5*60*HZ)
7342 void md_do_sync(struct md_thread
*thread
)
7344 struct mddev
*mddev
= thread
->mddev
;
7345 struct mddev
*mddev2
;
7346 unsigned int currspeed
= 0,
7348 sector_t max_sectors
,j
, io_sectors
;
7349 unsigned long mark
[SYNC_MARKS
];
7350 unsigned long update_time
;
7351 sector_t mark_cnt
[SYNC_MARKS
];
7353 struct list_head
*tmp
;
7354 sector_t last_check
;
7356 struct md_rdev
*rdev
;
7357 char *desc
, *action
= NULL
;
7358 struct blk_plug plug
;
7360 /* just incase thread restarts... */
7361 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7363 if (mddev
->ro
) /* never try to sync a read-only array */
7366 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7367 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7368 desc
= "data-check";
7370 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7371 desc
= "requested-resync";
7375 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7380 mddev
->last_sync_action
= action
?: desc
;
7382 /* we overload curr_resync somewhat here.
7383 * 0 == not engaged in resync at all
7384 * 2 == checking that there is no conflict with another sync
7385 * 1 == like 2, but have yielded to allow conflicting resync to
7387 * other == active in resync - this many blocks
7389 * Before starting a resync we must have set curr_resync to
7390 * 2, and then checked that every "conflicting" array has curr_resync
7391 * less than ours. When we find one that is the same or higher
7392 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7393 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7394 * This will mean we have to start checking from the beginning again.
7399 mddev
->curr_resync
= 2;
7402 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7404 for_each_mddev(mddev2
, tmp
) {
7405 if (mddev2
== mddev
)
7407 if (!mddev
->parallel_resync
7408 && mddev2
->curr_resync
7409 && match_mddev_units(mddev
, mddev2
)) {
7411 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7412 /* arbitrarily yield */
7413 mddev
->curr_resync
= 1;
7414 wake_up(&resync_wait
);
7416 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7417 /* no need to wait here, we can wait the next
7418 * time 'round when curr_resync == 2
7421 /* We need to wait 'interruptible' so as not to
7422 * contribute to the load average, and not to
7423 * be caught by 'softlockup'
7425 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7426 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7427 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7428 printk(KERN_INFO
"md: delaying %s of %s"
7429 " until %s has finished (they"
7430 " share one or more physical units)\n",
7431 desc
, mdname(mddev
), mdname(mddev2
));
7433 if (signal_pending(current
))
7434 flush_signals(current
);
7436 finish_wait(&resync_wait
, &wq
);
7439 finish_wait(&resync_wait
, &wq
);
7442 } while (mddev
->curr_resync
< 2);
7445 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7446 /* resync follows the size requested by the personality,
7447 * which defaults to physical size, but can be virtual size
7449 max_sectors
= mddev
->resync_max_sectors
;
7450 atomic64_set(&mddev
->resync_mismatches
, 0);
7451 /* we don't use the checkpoint if there's a bitmap */
7452 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7453 j
= mddev
->resync_min
;
7454 else if (!mddev
->bitmap
)
7455 j
= mddev
->recovery_cp
;
7457 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7458 max_sectors
= mddev
->resync_max_sectors
;
7460 /* recovery follows the physical size of devices */
7461 max_sectors
= mddev
->dev_sectors
;
7464 rdev_for_each_rcu(rdev
, mddev
)
7465 if (rdev
->raid_disk
>= 0 &&
7466 !test_bit(Faulty
, &rdev
->flags
) &&
7467 !test_bit(In_sync
, &rdev
->flags
) &&
7468 rdev
->recovery_offset
< j
)
7469 j
= rdev
->recovery_offset
;
7473 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7474 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7475 " %d KB/sec/disk.\n", speed_min(mddev
));
7476 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7477 "(but not more than %d KB/sec) for %s.\n",
7478 speed_max(mddev
), desc
);
7480 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7483 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7485 mark_cnt
[m
] = io_sectors
;
7488 mddev
->resync_mark
= mark
[last_mark
];
7489 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7492 * Tune reconstruction:
7494 window
= 32*(PAGE_SIZE
/512);
7495 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7496 window
/2, (unsigned long long)max_sectors
/2);
7498 atomic_set(&mddev
->recovery_active
, 0);
7503 "md: resuming %s of %s from checkpoint.\n",
7504 desc
, mdname(mddev
));
7505 mddev
->curr_resync
= j
;
7507 mddev
->curr_resync
= 3; /* no longer delayed */
7508 mddev
->curr_resync_completed
= j
;
7509 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7510 md_new_event(mddev
);
7511 update_time
= jiffies
;
7513 blk_start_plug(&plug
);
7514 while (j
< max_sectors
) {
7519 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7520 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7521 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7522 > (max_sectors
>> 4)) ||
7523 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7524 (j
- mddev
->curr_resync_completed
)*2
7525 >= mddev
->resync_max
- mddev
->curr_resync_completed
7527 /* time to update curr_resync_completed */
7528 wait_event(mddev
->recovery_wait
,
7529 atomic_read(&mddev
->recovery_active
) == 0);
7530 mddev
->curr_resync_completed
= j
;
7531 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7532 j
> mddev
->recovery_cp
)
7533 mddev
->recovery_cp
= j
;
7534 update_time
= jiffies
;
7535 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7536 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7539 while (j
>= mddev
->resync_max
&&
7540 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7541 /* As this condition is controlled by user-space,
7542 * we can block indefinitely, so use '_interruptible'
7543 * to avoid triggering warnings.
7545 flush_signals(current
); /* just in case */
7546 wait_event_interruptible(mddev
->recovery_wait
,
7547 mddev
->resync_max
> j
7548 || test_bit(MD_RECOVERY_INTR
,
7552 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7555 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7556 currspeed
< speed_min(mddev
));
7558 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7562 if (!skipped
) { /* actual IO requested */
7563 io_sectors
+= sectors
;
7564 atomic_add(sectors
, &mddev
->recovery_active
);
7567 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7572 mddev
->curr_resync
= j
;
7573 mddev
->curr_mark_cnt
= io_sectors
;
7574 if (last_check
== 0)
7575 /* this is the earliest that rebuild will be
7576 * visible in /proc/mdstat
7578 md_new_event(mddev
);
7580 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7583 last_check
= io_sectors
;
7585 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7587 int next
= (last_mark
+1) % SYNC_MARKS
;
7589 mddev
->resync_mark
= mark
[next
];
7590 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7591 mark
[next
] = jiffies
;
7592 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7596 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7600 * this loop exits only if either when we are slower than
7601 * the 'hard' speed limit, or the system was IO-idle for
7603 * the system might be non-idle CPU-wise, but we only care
7604 * about not overloading the IO subsystem. (things like an
7605 * e2fsck being done on the RAID array should execute fast)
7609 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7610 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7612 if (currspeed
> speed_min(mddev
)) {
7613 if ((currspeed
> speed_max(mddev
)) ||
7614 !is_mddev_idle(mddev
, 0)) {
7620 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7621 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7622 ? "interrupted" : "done");
7624 * this also signals 'finished resyncing' to md_stop
7626 blk_finish_plug(&plug
);
7627 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7629 /* tell personality that we are finished */
7630 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7632 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7633 mddev
->curr_resync
> 2) {
7634 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7635 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7636 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7638 "md: checkpointing %s of %s.\n",
7639 desc
, mdname(mddev
));
7640 if (test_bit(MD_RECOVERY_ERROR
,
7642 mddev
->recovery_cp
=
7643 mddev
->curr_resync_completed
;
7645 mddev
->recovery_cp
=
7649 mddev
->recovery_cp
= MaxSector
;
7651 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7652 mddev
->curr_resync
= MaxSector
;
7654 rdev_for_each_rcu(rdev
, mddev
)
7655 if (rdev
->raid_disk
>= 0 &&
7656 mddev
->delta_disks
>= 0 &&
7657 !test_bit(Faulty
, &rdev
->flags
) &&
7658 !test_bit(In_sync
, &rdev
->flags
) &&
7659 rdev
->recovery_offset
< mddev
->curr_resync
)
7660 rdev
->recovery_offset
= mddev
->curr_resync
;
7665 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7667 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7668 /* We completed so min/max setting can be forgotten if used. */
7669 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7670 mddev
->resync_min
= 0;
7671 mddev
->resync_max
= MaxSector
;
7672 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7673 mddev
->resync_min
= mddev
->curr_resync_completed
;
7674 mddev
->curr_resync
= 0;
7675 wake_up(&resync_wait
);
7676 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7677 md_wakeup_thread(mddev
->thread
);
7680 EXPORT_SYMBOL_GPL(md_do_sync
);
7682 static int remove_and_add_spares(struct mddev
*mddev
,
7683 struct md_rdev
*this)
7685 struct md_rdev
*rdev
;
7689 rdev_for_each(rdev
, mddev
)
7690 if ((this == NULL
|| rdev
== this) &&
7691 rdev
->raid_disk
>= 0 &&
7692 !test_bit(Blocked
, &rdev
->flags
) &&
7693 (test_bit(Faulty
, &rdev
->flags
) ||
7694 ! test_bit(In_sync
, &rdev
->flags
)) &&
7695 atomic_read(&rdev
->nr_pending
)==0) {
7696 if (mddev
->pers
->hot_remove_disk(
7697 mddev
, rdev
) == 0) {
7698 sysfs_unlink_rdev(mddev
, rdev
);
7699 rdev
->raid_disk
= -1;
7703 if (removed
&& mddev
->kobj
.sd
)
7704 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7709 rdev_for_each(rdev
, mddev
) {
7710 if (rdev
->raid_disk
>= 0 &&
7711 !test_bit(In_sync
, &rdev
->flags
) &&
7712 !test_bit(Faulty
, &rdev
->flags
))
7714 if (rdev
->raid_disk
>= 0)
7716 if (test_bit(Faulty
, &rdev
->flags
))
7719 rdev
->saved_raid_disk
< 0)
7722 rdev
->recovery_offset
= 0;
7724 hot_add_disk(mddev
, rdev
) == 0) {
7725 if (sysfs_link_rdev(mddev
, rdev
))
7726 /* failure here is OK */;
7728 md_new_event(mddev
);
7729 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7734 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7739 * This routine is regularly called by all per-raid-array threads to
7740 * deal with generic issues like resync and super-block update.
7741 * Raid personalities that don't have a thread (linear/raid0) do not
7742 * need this as they never do any recovery or update the superblock.
7744 * It does not do any resync itself, but rather "forks" off other threads
7745 * to do that as needed.
7746 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7747 * "->recovery" and create a thread at ->sync_thread.
7748 * When the thread finishes it sets MD_RECOVERY_DONE
7749 * and wakeups up this thread which will reap the thread and finish up.
7750 * This thread also removes any faulty devices (with nr_pending == 0).
7752 * The overall approach is:
7753 * 1/ if the superblock needs updating, update it.
7754 * 2/ If a recovery thread is running, don't do anything else.
7755 * 3/ If recovery has finished, clean up, possibly marking spares active.
7756 * 4/ If there are any faulty devices, remove them.
7757 * 5/ If array is degraded, try to add spares devices
7758 * 6/ If array has spares or is not in-sync, start a resync thread.
7760 void md_check_recovery(struct mddev
*mddev
)
7762 if (mddev
->suspended
)
7766 bitmap_daemon_work(mddev
);
7768 if (signal_pending(current
)) {
7769 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7770 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7772 mddev
->safemode
= 2;
7774 flush_signals(current
);
7777 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7780 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7781 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7782 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7783 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7784 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7785 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7789 if (mddev_trylock(mddev
)) {
7793 /* On a read-only array we can:
7794 * - remove failed devices
7795 * - add already-in_sync devices if the array itself
7797 * As we only add devices that are already in-sync,
7798 * we can activate the spares immediately.
7800 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7801 remove_and_add_spares(mddev
, NULL
);
7802 mddev
->pers
->spare_active(mddev
);
7806 if (!mddev
->external
) {
7808 spin_lock_irq(&mddev
->write_lock
);
7809 if (mddev
->safemode
&&
7810 !atomic_read(&mddev
->writes_pending
) &&
7812 mddev
->recovery_cp
== MaxSector
) {
7815 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7817 if (mddev
->safemode
== 1)
7818 mddev
->safemode
= 0;
7819 spin_unlock_irq(&mddev
->write_lock
);
7821 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7824 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7825 md_update_sb(mddev
, 0);
7827 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7828 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7829 /* resync/recovery still happening */
7830 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7833 if (mddev
->sync_thread
) {
7834 md_reap_sync_thread(mddev
);
7837 /* Set RUNNING before clearing NEEDED to avoid
7838 * any transients in the value of "sync_action".
7840 mddev
->curr_resync_completed
= 0;
7841 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7842 /* Clear some bits that don't mean anything, but
7845 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7846 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7848 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7849 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7851 /* no recovery is running.
7852 * remove any failed drives, then
7853 * add spares if possible.
7854 * Spares are also removed and re-added, to allow
7855 * the personality to fail the re-add.
7858 if (mddev
->reshape_position
!= MaxSector
) {
7859 if (mddev
->pers
->check_reshape
== NULL
||
7860 mddev
->pers
->check_reshape(mddev
) != 0)
7861 /* Cannot proceed */
7863 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7864 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7865 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7866 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7867 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7868 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7869 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7870 } else if (mddev
->recovery_cp
< MaxSector
) {
7871 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7872 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7873 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7874 /* nothing to be done ... */
7877 if (mddev
->pers
->sync_request
) {
7879 /* We are adding a device or devices to an array
7880 * which has the bitmap stored on all devices.
7881 * So make sure all bitmap pages get written
7883 bitmap_write_all(mddev
->bitmap
);
7885 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7888 if (!mddev
->sync_thread
) {
7889 printk(KERN_ERR
"%s: could not start resync"
7892 /* leave the spares where they are, it shouldn't hurt */
7893 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7894 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7895 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7896 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7897 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7899 md_wakeup_thread(mddev
->sync_thread
);
7900 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7901 md_new_event(mddev
);
7904 wake_up(&mddev
->sb_wait
);
7906 if (!mddev
->sync_thread
) {
7907 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7908 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7910 if (mddev
->sysfs_action
)
7911 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7913 mddev_unlock(mddev
);
7917 void md_reap_sync_thread(struct mddev
*mddev
)
7919 struct md_rdev
*rdev
;
7921 /* resync has finished, collect result */
7922 md_unregister_thread(&mddev
->sync_thread
);
7923 wake_up(&resync_wait
);
7924 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7925 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7927 /* activate any spares */
7928 if (mddev
->pers
->spare_active(mddev
)) {
7929 sysfs_notify(&mddev
->kobj
, NULL
,
7931 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7934 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7935 mddev
->pers
->finish_reshape
)
7936 mddev
->pers
->finish_reshape(mddev
);
7938 /* If array is no-longer degraded, then any saved_raid_disk
7939 * information must be scrapped. Also if any device is now
7940 * In_sync we must scrape the saved_raid_disk for that device
7941 * do the superblock for an incrementally recovered device
7944 rdev_for_each(rdev
, mddev
)
7945 if (!mddev
->degraded
||
7946 test_bit(In_sync
, &rdev
->flags
))
7947 rdev
->saved_raid_disk
= -1;
7949 md_update_sb(mddev
, 1);
7950 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7951 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7952 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7953 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7954 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7955 /* flag recovery needed just to double check */
7956 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7957 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7958 md_new_event(mddev
);
7959 if (mddev
->event_work
.func
)
7960 queue_work(md_misc_wq
, &mddev
->event_work
);
7963 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7965 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7966 wait_event_timeout(rdev
->blocked_wait
,
7967 !test_bit(Blocked
, &rdev
->flags
) &&
7968 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7969 msecs_to_jiffies(5000));
7970 rdev_dec_pending(rdev
, mddev
);
7972 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7974 void md_finish_reshape(struct mddev
*mddev
)
7976 /* called be personality module when reshape completes. */
7977 struct md_rdev
*rdev
;
7979 rdev_for_each(rdev
, mddev
) {
7980 if (rdev
->data_offset
> rdev
->new_data_offset
)
7981 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7983 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7984 rdev
->data_offset
= rdev
->new_data_offset
;
7987 EXPORT_SYMBOL(md_finish_reshape
);
7989 /* Bad block management.
7990 * We can record which blocks on each device are 'bad' and so just
7991 * fail those blocks, or that stripe, rather than the whole device.
7992 * Entries in the bad-block table are 64bits wide. This comprises:
7993 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7994 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7995 * A 'shift' can be set so that larger blocks are tracked and
7996 * consequently larger devices can be covered.
7997 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7999 * Locking of the bad-block table uses a seqlock so md_is_badblock
8000 * might need to retry if it is very unlucky.
8001 * We will sometimes want to check for bad blocks in a bi_end_io function,
8002 * so we use the write_seqlock_irq variant.
8004 * When looking for a bad block we specify a range and want to
8005 * know if any block in the range is bad. So we binary-search
8006 * to the last range that starts at-or-before the given endpoint,
8007 * (or "before the sector after the target range")
8008 * then see if it ends after the given start.
8010 * 0 if there are no known bad blocks in the range
8011 * 1 if there are known bad block which are all acknowledged
8012 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8013 * plus the start/length of the first bad section we overlap.
8015 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8016 sector_t
*first_bad
, int *bad_sectors
)
8022 sector_t target
= s
+ sectors
;
8025 if (bb
->shift
> 0) {
8026 /* round the start down, and the end up */
8028 target
+= (1<<bb
->shift
) - 1;
8029 target
>>= bb
->shift
;
8030 sectors
= target
- s
;
8032 /* 'target' is now the first block after the bad range */
8035 seq
= read_seqbegin(&bb
->lock
);
8040 /* Binary search between lo and hi for 'target'
8041 * i.e. for the last range that starts before 'target'
8043 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8044 * are known not to be the last range before target.
8045 * VARIANT: hi-lo is the number of possible
8046 * ranges, and decreases until it reaches 1
8048 while (hi
- lo
> 1) {
8049 int mid
= (lo
+ hi
) / 2;
8050 sector_t a
= BB_OFFSET(p
[mid
]);
8052 /* This could still be the one, earlier ranges
8056 /* This and later ranges are definitely out. */
8059 /* 'lo' might be the last that started before target, but 'hi' isn't */
8061 /* need to check all range that end after 's' to see if
8062 * any are unacknowledged.
8065 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8066 if (BB_OFFSET(p
[lo
]) < target
) {
8067 /* starts before the end, and finishes after
8068 * the start, so they must overlap
8070 if (rv
!= -1 && BB_ACK(p
[lo
]))
8074 *first_bad
= BB_OFFSET(p
[lo
]);
8075 *bad_sectors
= BB_LEN(p
[lo
]);
8081 if (read_seqretry(&bb
->lock
, seq
))
8086 EXPORT_SYMBOL_GPL(md_is_badblock
);
8089 * Add a range of bad blocks to the table.
8090 * This might extend the table, or might contract it
8091 * if two adjacent ranges can be merged.
8092 * We binary-search to find the 'insertion' point, then
8093 * decide how best to handle it.
8095 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8101 unsigned long flags
;
8104 /* badblocks are disabled */
8108 /* round the start down, and the end up */
8109 sector_t next
= s
+ sectors
;
8111 next
+= (1<<bb
->shift
) - 1;
8116 write_seqlock_irqsave(&bb
->lock
, flags
);
8121 /* Find the last range that starts at-or-before 's' */
8122 while (hi
- lo
> 1) {
8123 int mid
= (lo
+ hi
) / 2;
8124 sector_t a
= BB_OFFSET(p
[mid
]);
8130 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8134 /* we found a range that might merge with the start
8137 sector_t a
= BB_OFFSET(p
[lo
]);
8138 sector_t e
= a
+ BB_LEN(p
[lo
]);
8139 int ack
= BB_ACK(p
[lo
]);
8141 /* Yes, we can merge with a previous range */
8142 if (s
== a
&& s
+ sectors
>= e
)
8143 /* new range covers old */
8146 ack
= ack
&& acknowledged
;
8148 if (e
< s
+ sectors
)
8150 if (e
- a
<= BB_MAX_LEN
) {
8151 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8154 /* does not all fit in one range,
8155 * make p[lo] maximal
8157 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8158 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8164 if (sectors
&& hi
< bb
->count
) {
8165 /* 'hi' points to the first range that starts after 's'.
8166 * Maybe we can merge with the start of that range */
8167 sector_t a
= BB_OFFSET(p
[hi
]);
8168 sector_t e
= a
+ BB_LEN(p
[hi
]);
8169 int ack
= BB_ACK(p
[hi
]);
8170 if (a
<= s
+ sectors
) {
8171 /* merging is possible */
8172 if (e
<= s
+ sectors
) {
8177 ack
= ack
&& acknowledged
;
8180 if (e
- a
<= BB_MAX_LEN
) {
8181 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8184 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8192 if (sectors
== 0 && hi
< bb
->count
) {
8193 /* we might be able to combine lo and hi */
8194 /* Note: 's' is at the end of 'lo' */
8195 sector_t a
= BB_OFFSET(p
[hi
]);
8196 int lolen
= BB_LEN(p
[lo
]);
8197 int hilen
= BB_LEN(p
[hi
]);
8198 int newlen
= lolen
+ hilen
- (s
- a
);
8199 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8200 /* yes, we can combine them */
8201 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8202 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8203 memmove(p
+ hi
, p
+ hi
+ 1,
8204 (bb
->count
- hi
- 1) * 8);
8209 /* didn't merge (it all).
8210 * Need to add a range just before 'hi' */
8211 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8212 /* No room for more */
8216 int this_sectors
= sectors
;
8217 memmove(p
+ hi
+ 1, p
+ hi
,
8218 (bb
->count
- hi
) * 8);
8221 if (this_sectors
> BB_MAX_LEN
)
8222 this_sectors
= BB_MAX_LEN
;
8223 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8224 sectors
-= this_sectors
;
8231 bb
->unacked_exist
= 1;
8232 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8237 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8242 s
+= rdev
->new_data_offset
;
8244 s
+= rdev
->data_offset
;
8245 rv
= md_set_badblocks(&rdev
->badblocks
,
8248 /* Make sure they get written out promptly */
8249 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8250 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8251 md_wakeup_thread(rdev
->mddev
->thread
);
8255 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8258 * Remove a range of bad blocks from the table.
8259 * This may involve extending the table if we spilt a region,
8260 * but it must not fail. So if the table becomes full, we just
8261 * drop the remove request.
8263 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8267 sector_t target
= s
+ sectors
;
8270 if (bb
->shift
> 0) {
8271 /* When clearing we round the start up and the end down.
8272 * This should not matter as the shift should align with
8273 * the block size and no rounding should ever be needed.
8274 * However it is better the think a block is bad when it
8275 * isn't than to think a block is not bad when it is.
8277 s
+= (1<<bb
->shift
) - 1;
8279 target
>>= bb
->shift
;
8280 sectors
= target
- s
;
8283 write_seqlock_irq(&bb
->lock
);
8288 /* Find the last range that starts before 'target' */
8289 while (hi
- lo
> 1) {
8290 int mid
= (lo
+ hi
) / 2;
8291 sector_t a
= BB_OFFSET(p
[mid
]);
8298 /* p[lo] is the last range that could overlap the
8299 * current range. Earlier ranges could also overlap,
8300 * but only this one can overlap the end of the range.
8302 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8303 /* Partial overlap, leave the tail of this range */
8304 int ack
= BB_ACK(p
[lo
]);
8305 sector_t a
= BB_OFFSET(p
[lo
]);
8306 sector_t end
= a
+ BB_LEN(p
[lo
]);
8309 /* we need to split this range */
8310 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8314 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8316 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8319 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8320 /* there is no longer an overlap */
8325 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8326 /* This range does overlap */
8327 if (BB_OFFSET(p
[lo
]) < s
) {
8328 /* Keep the early parts of this range. */
8329 int ack
= BB_ACK(p
[lo
]);
8330 sector_t start
= BB_OFFSET(p
[lo
]);
8331 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8332 /* now low doesn't overlap, so.. */
8337 /* 'lo' is strictly before, 'hi' is strictly after,
8338 * anything between needs to be discarded
8341 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8342 bb
->count
-= (hi
- lo
- 1);
8348 write_sequnlock_irq(&bb
->lock
);
8352 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8356 s
+= rdev
->new_data_offset
;
8358 s
+= rdev
->data_offset
;
8359 return md_clear_badblocks(&rdev
->badblocks
,
8362 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8365 * Acknowledge all bad blocks in a list.
8366 * This only succeeds if ->changed is clear. It is used by
8367 * in-kernel metadata updates
8369 void md_ack_all_badblocks(struct badblocks
*bb
)
8371 if (bb
->page
== NULL
|| bb
->changed
)
8372 /* no point even trying */
8374 write_seqlock_irq(&bb
->lock
);
8376 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8379 for (i
= 0; i
< bb
->count
; i
++) {
8380 if (!BB_ACK(p
[i
])) {
8381 sector_t start
= BB_OFFSET(p
[i
]);
8382 int len
= BB_LEN(p
[i
]);
8383 p
[i
] = BB_MAKE(start
, len
, 1);
8386 bb
->unacked_exist
= 0;
8388 write_sequnlock_irq(&bb
->lock
);
8390 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8392 /* sysfs access to bad-blocks list.
8393 * We present two files.
8394 * 'bad-blocks' lists sector numbers and lengths of ranges that
8395 * are recorded as bad. The list is truncated to fit within
8396 * the one-page limit of sysfs.
8397 * Writing "sector length" to this file adds an acknowledged
8399 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8400 * been acknowledged. Writing to this file adds bad blocks
8401 * without acknowledging them. This is largely for testing.
8405 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8416 seq
= read_seqbegin(&bb
->lock
);
8421 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8422 sector_t s
= BB_OFFSET(p
[i
]);
8423 unsigned int length
= BB_LEN(p
[i
]);
8424 int ack
= BB_ACK(p
[i
]);
8430 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8431 (unsigned long long)s
<< bb
->shift
,
8432 length
<< bb
->shift
);
8434 if (unack
&& len
== 0)
8435 bb
->unacked_exist
= 0;
8437 if (read_seqretry(&bb
->lock
, seq
))
8446 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8448 unsigned long long sector
;
8452 /* Allow clearing via sysfs *only* for testing/debugging.
8453 * Normally only a successful write may clear a badblock
8456 if (page
[0] == '-') {
8460 #endif /* DO_DEBUG */
8462 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8464 if (newline
!= '\n')
8476 md_clear_badblocks(bb
, sector
, length
);
8479 #endif /* DO_DEBUG */
8480 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8486 static int md_notify_reboot(struct notifier_block
*this,
8487 unsigned long code
, void *x
)
8489 struct list_head
*tmp
;
8490 struct mddev
*mddev
;
8493 for_each_mddev(mddev
, tmp
) {
8494 if (mddev_trylock(mddev
)) {
8496 __md_stop_writes(mddev
);
8497 mddev
->safemode
= 2;
8498 mddev_unlock(mddev
);
8503 * certain more exotic SCSI devices are known to be
8504 * volatile wrt too early system reboots. While the
8505 * right place to handle this issue is the given
8506 * driver, we do want to have a safe RAID driver ...
8514 static struct notifier_block md_notifier
= {
8515 .notifier_call
= md_notify_reboot
,
8517 .priority
= INT_MAX
, /* before any real devices */
8520 static void md_geninit(void)
8522 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8524 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8527 static int __init
md_init(void)
8531 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8535 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8539 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8542 if ((ret
= register_blkdev(0, "mdp")) < 0)
8546 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8547 md_probe
, NULL
, NULL
);
8548 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8549 md_probe
, NULL
, NULL
);
8551 register_reboot_notifier(&md_notifier
);
8552 raid_table_header
= register_sysctl_table(raid_root_table
);
8558 unregister_blkdev(MD_MAJOR
, "md");
8560 destroy_workqueue(md_misc_wq
);
8562 destroy_workqueue(md_wq
);
8570 * Searches all registered partitions for autorun RAID arrays
8574 static LIST_HEAD(all_detected_devices
);
8575 struct detected_devices_node
{
8576 struct list_head list
;
8580 void md_autodetect_dev(dev_t dev
)
8582 struct detected_devices_node
*node_detected_dev
;
8584 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8585 if (node_detected_dev
) {
8586 node_detected_dev
->dev
= dev
;
8587 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8589 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8590 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8595 static void autostart_arrays(int part
)
8597 struct md_rdev
*rdev
;
8598 struct detected_devices_node
*node_detected_dev
;
8600 int i_scanned
, i_passed
;
8605 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8607 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8609 node_detected_dev
= list_entry(all_detected_devices
.next
,
8610 struct detected_devices_node
, list
);
8611 list_del(&node_detected_dev
->list
);
8612 dev
= node_detected_dev
->dev
;
8613 kfree(node_detected_dev
);
8614 rdev
= md_import_device(dev
,0, 90);
8618 if (test_bit(Faulty
, &rdev
->flags
)) {
8622 set_bit(AutoDetected
, &rdev
->flags
);
8623 list_add(&rdev
->same_set
, &pending_raid_disks
);
8627 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8628 i_scanned
, i_passed
);
8630 autorun_devices(part
);
8633 #endif /* !MODULE */
8635 static __exit
void md_exit(void)
8637 struct mddev
*mddev
;
8638 struct list_head
*tmp
;
8640 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8641 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8643 unregister_blkdev(MD_MAJOR
,"md");
8644 unregister_blkdev(mdp_major
, "mdp");
8645 unregister_reboot_notifier(&md_notifier
);
8646 unregister_sysctl_table(raid_table_header
);
8647 remove_proc_entry("mdstat", NULL
);
8648 for_each_mddev(mddev
, tmp
) {
8649 export_array(mddev
);
8650 mddev
->hold_active
= 0;
8652 destroy_workqueue(md_misc_wq
);
8653 destroy_workqueue(md_wq
);
8656 subsys_initcall(md_init
);
8657 module_exit(md_exit
)
8659 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8661 return sprintf(buffer
, "%d", start_readonly
);
8663 static int set_ro(const char *val
, struct kernel_param
*kp
)
8666 int num
= simple_strtoul(val
, &e
, 10);
8667 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8668 start_readonly
= num
;
8674 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8675 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8677 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8679 EXPORT_SYMBOL(register_md_personality
);
8680 EXPORT_SYMBOL(unregister_md_personality
);
8681 EXPORT_SYMBOL(md_error
);
8682 EXPORT_SYMBOL(md_done_sync
);
8683 EXPORT_SYMBOL(md_write_start
);
8684 EXPORT_SYMBOL(md_write_end
);
8685 EXPORT_SYMBOL(md_register_thread
);
8686 EXPORT_SYMBOL(md_unregister_thread
);
8687 EXPORT_SYMBOL(md_wakeup_thread
);
8688 EXPORT_SYMBOL(md_check_recovery
);
8689 EXPORT_SYMBOL(md_reap_sync_thread
);
8690 MODULE_LICENSE("GPL");
8691 MODULE_DESCRIPTION("MD RAID framework");
8693 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);