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/badblocks.h>
38 #include <linux/sysctl.h>
39 #include <linux/seq_file.h>
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/module.h>
48 #include <linux/reboot.h>
49 #include <linux/file.h>
50 #include <linux/compat.h>
51 #include <linux/delay.h>
52 #include <linux/raid/md_p.h>
53 #include <linux/raid/md_u.h>
54 #include <linux/slab.h>
57 #include "md-cluster.h"
60 static void autostart_arrays(int part
);
63 /* pers_list is a list of registered personalities protected
65 * pers_lock does extra service to protect accesses to
66 * mddev->thread when the mutex cannot be held.
68 static LIST_HEAD(pers_list
);
69 static DEFINE_SPINLOCK(pers_lock
);
71 struct md_cluster_operations
*md_cluster_ops
;
72 EXPORT_SYMBOL(md_cluster_ops
);
73 struct module
*md_cluster_mod
;
74 EXPORT_SYMBOL(md_cluster_mod
);
76 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
77 static struct workqueue_struct
*md_wq
;
78 static struct workqueue_struct
*md_misc_wq
;
80 static int remove_and_add_spares(struct mddev
*mddev
,
81 struct md_rdev
*this);
82 static void mddev_detach(struct mddev
*mddev
);
85 * Default number of read corrections we'll attempt on an rdev
86 * before ejecting it from the array. We divide the read error
87 * count by 2 for every hour elapsed between read errors.
89 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
91 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
92 * is 1000 KB/sec, so the extra system load does not show up that much.
93 * Increase it if you want to have more _guaranteed_ speed. Note that
94 * the RAID driver will use the maximum available bandwidth if the IO
95 * subsystem is idle. There is also an 'absolute maximum' reconstruction
96 * speed limit - in case reconstruction slows down your system despite
99 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
100 * or /sys/block/mdX/md/sync_speed_{min,max}
103 static int sysctl_speed_limit_min
= 1000;
104 static int sysctl_speed_limit_max
= 200000;
105 static inline int speed_min(struct mddev
*mddev
)
107 return mddev
->sync_speed_min
?
108 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
111 static inline int speed_max(struct mddev
*mddev
)
113 return mddev
->sync_speed_max
?
114 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
117 static struct ctl_table_header
*raid_table_header
;
119 static struct ctl_table raid_table
[] = {
121 .procname
= "speed_limit_min",
122 .data
= &sysctl_speed_limit_min
,
123 .maxlen
= sizeof(int),
124 .mode
= S_IRUGO
|S_IWUSR
,
125 .proc_handler
= proc_dointvec
,
128 .procname
= "speed_limit_max",
129 .data
= &sysctl_speed_limit_max
,
130 .maxlen
= sizeof(int),
131 .mode
= S_IRUGO
|S_IWUSR
,
132 .proc_handler
= proc_dointvec
,
137 static struct ctl_table raid_dir_table
[] = {
141 .mode
= S_IRUGO
|S_IXUGO
,
147 static struct ctl_table raid_root_table
[] = {
152 .child
= raid_dir_table
,
157 static const struct block_device_operations md_fops
;
159 static int start_readonly
;
162 * like bio_clone, but with a local bio set
165 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
170 if (!mddev
|| !mddev
->bio_set
)
171 return bio_alloc(gfp_mask
, nr_iovecs
);
173 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
178 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
180 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
183 if (!mddev
|| !mddev
->bio_set
)
184 return bio_clone(bio
, gfp_mask
);
186 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
188 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
191 * We have a system wide 'event count' that is incremented
192 * on any 'interesting' event, and readers of /proc/mdstat
193 * can use 'poll' or 'select' to find out when the event
197 * start array, stop array, error, add device, remove device,
198 * start build, activate spare
200 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
201 static atomic_t md_event_count
;
202 void md_new_event(struct mddev
*mddev
)
204 atomic_inc(&md_event_count
);
205 wake_up(&md_event_waiters
);
207 EXPORT_SYMBOL_GPL(md_new_event
);
210 * Enables to iterate over all existing md arrays
211 * all_mddevs_lock protects this list.
213 static LIST_HEAD(all_mddevs
);
214 static DEFINE_SPINLOCK(all_mddevs_lock
);
217 * iterates through all used mddevs in the system.
218 * We take care to grab the all_mddevs_lock whenever navigating
219 * the list, and to always hold a refcount when unlocked.
220 * Any code which breaks out of this loop while own
221 * a reference to the current mddev and must mddev_put it.
223 #define for_each_mddev(_mddev,_tmp) \
225 for (({ spin_lock(&all_mddevs_lock); \
226 _tmp = all_mddevs.next; \
228 ({ if (_tmp != &all_mddevs) \
229 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
230 spin_unlock(&all_mddevs_lock); \
231 if (_mddev) mddev_put(_mddev); \
232 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
233 _tmp != &all_mddevs;}); \
234 ({ spin_lock(&all_mddevs_lock); \
235 _tmp = _tmp->next;}) \
238 /* Rather than calling directly into the personality make_request function,
239 * IO requests come here first so that we can check if the device is
240 * being suspended pending a reconfiguration.
241 * We hold a refcount over the call to ->make_request. By the time that
242 * call has finished, the bio has been linked into some internal structure
243 * and so is visible to ->quiesce(), so we don't need the refcount any more.
245 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
247 const int rw
= bio_data_dir(bio
);
248 struct mddev
*mddev
= q
->queuedata
;
249 unsigned int sectors
;
252 blk_queue_split(q
, &bio
, q
->bio_split
);
254 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
256 return BLK_QC_T_NONE
;
258 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
259 if (bio_sectors(bio
) != 0)
260 bio
->bi_error
= -EROFS
;
262 return BLK_QC_T_NONE
;
264 smp_rmb(); /* Ensure implications of 'active' are visible */
266 if (mddev
->suspended
) {
269 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
270 TASK_UNINTERRUPTIBLE
);
271 if (!mddev
->suspended
)
277 finish_wait(&mddev
->sb_wait
, &__wait
);
279 atomic_inc(&mddev
->active_io
);
283 * save the sectors now since our bio can
284 * go away inside make_request
286 sectors
= bio_sectors(bio
);
287 mddev
->pers
->make_request(mddev
, bio
);
289 cpu
= part_stat_lock();
290 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
291 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
294 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
295 wake_up(&mddev
->sb_wait
);
297 return BLK_QC_T_NONE
;
300 /* mddev_suspend makes sure no new requests are submitted
301 * to the device, and that any requests that have been submitted
302 * are completely handled.
303 * Once mddev_detach() is called and completes, the module will be
306 void mddev_suspend(struct mddev
*mddev
)
308 WARN_ON_ONCE(current
== mddev
->thread
->tsk
);
309 if (mddev
->suspended
++)
312 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
313 mddev
->pers
->quiesce(mddev
, 1);
315 del_timer_sync(&mddev
->safemode_timer
);
317 EXPORT_SYMBOL_GPL(mddev_suspend
);
319 void mddev_resume(struct mddev
*mddev
)
321 if (--mddev
->suspended
)
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 struct md_personality
*pers
= mddev
->pers
;
338 if (mddev
->suspended
)
340 else if (pers
&& pers
->congested
)
341 ret
= pers
->congested(mddev
, bits
);
345 EXPORT_SYMBOL_GPL(mddev_congested
);
346 static int md_congested(void *data
, int bits
)
348 struct mddev
*mddev
= data
;
349 return mddev_congested(mddev
, bits
);
353 * Generic flush handling for md
356 static void md_end_flush(struct bio
*bio
)
358 struct md_rdev
*rdev
= bio
->bi_private
;
359 struct mddev
*mddev
= rdev
->mddev
;
361 rdev_dec_pending(rdev
, mddev
);
363 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
364 /* The pre-request flush has finished */
365 queue_work(md_wq
, &mddev
->flush_work
);
370 static void md_submit_flush_data(struct work_struct
*ws
);
372 static void submit_flushes(struct work_struct
*ws
)
374 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
375 struct md_rdev
*rdev
;
377 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
378 atomic_set(&mddev
->flush_pending
, 1);
380 rdev_for_each_rcu(rdev
, mddev
)
381 if (rdev
->raid_disk
>= 0 &&
382 !test_bit(Faulty
, &rdev
->flags
)) {
383 /* Take two references, one is dropped
384 * when request finishes, one after
385 * we reclaim rcu_read_lock
388 atomic_inc(&rdev
->nr_pending
);
389 atomic_inc(&rdev
->nr_pending
);
391 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
392 bi
->bi_end_io
= md_end_flush
;
393 bi
->bi_private
= rdev
;
394 bi
->bi_bdev
= rdev
->bdev
;
395 atomic_inc(&mddev
->flush_pending
);
396 submit_bio(WRITE_FLUSH
, bi
);
398 rdev_dec_pending(rdev
, mddev
);
401 if (atomic_dec_and_test(&mddev
->flush_pending
))
402 queue_work(md_wq
, &mddev
->flush_work
);
405 static void md_submit_flush_data(struct work_struct
*ws
)
407 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
408 struct bio
*bio
= mddev
->flush_bio
;
410 if (bio
->bi_iter
.bi_size
== 0)
411 /* an empty barrier - all done */
414 bio
->bi_rw
&= ~REQ_FLUSH
;
415 mddev
->pers
->make_request(mddev
, bio
);
418 mddev
->flush_bio
= NULL
;
419 wake_up(&mddev
->sb_wait
);
422 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
424 spin_lock_irq(&mddev
->lock
);
425 wait_event_lock_irq(mddev
->sb_wait
,
428 mddev
->flush_bio
= bio
;
429 spin_unlock_irq(&mddev
->lock
);
431 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
432 queue_work(md_wq
, &mddev
->flush_work
);
434 EXPORT_SYMBOL(md_flush_request
);
436 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
438 struct mddev
*mddev
= cb
->data
;
439 md_wakeup_thread(mddev
->thread
);
442 EXPORT_SYMBOL(md_unplug
);
444 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
446 atomic_inc(&mddev
->active
);
450 static void mddev_delayed_delete(struct work_struct
*ws
);
452 static void mddev_put(struct mddev
*mddev
)
454 struct bio_set
*bs
= NULL
;
456 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
458 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
459 mddev
->ctime
== 0 && !mddev
->hold_active
) {
460 /* Array is not configured at all, and not held active,
462 list_del_init(&mddev
->all_mddevs
);
464 mddev
->bio_set
= NULL
;
465 if (mddev
->gendisk
) {
466 /* We did a probe so need to clean up. Call
467 * queue_work inside the spinlock so that
468 * flush_workqueue() after mddev_find will
469 * succeed in waiting for the work to be done.
471 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
472 queue_work(md_misc_wq
, &mddev
->del_work
);
476 spin_unlock(&all_mddevs_lock
);
481 static void md_safemode_timeout(unsigned long data
);
483 void mddev_init(struct mddev
*mddev
)
485 mutex_init(&mddev
->open_mutex
);
486 mutex_init(&mddev
->reconfig_mutex
);
487 mutex_init(&mddev
->bitmap_info
.mutex
);
488 INIT_LIST_HEAD(&mddev
->disks
);
489 INIT_LIST_HEAD(&mddev
->all_mddevs
);
490 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
491 (unsigned long) mddev
);
492 atomic_set(&mddev
->active
, 1);
493 atomic_set(&mddev
->openers
, 0);
494 atomic_set(&mddev
->active_io
, 0);
495 spin_lock_init(&mddev
->lock
);
496 atomic_set(&mddev
->flush_pending
, 0);
497 init_waitqueue_head(&mddev
->sb_wait
);
498 init_waitqueue_head(&mddev
->recovery_wait
);
499 mddev
->reshape_position
= MaxSector
;
500 mddev
->reshape_backwards
= 0;
501 mddev
->last_sync_action
= "none";
502 mddev
->resync_min
= 0;
503 mddev
->resync_max
= MaxSector
;
504 mddev
->level
= LEVEL_NONE
;
506 EXPORT_SYMBOL_GPL(mddev_init
);
508 static struct mddev
*mddev_find(dev_t unit
)
510 struct mddev
*mddev
, *new = NULL
;
512 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
513 unit
&= ~((1<<MdpMinorShift
)-1);
516 spin_lock(&all_mddevs_lock
);
519 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
520 if (mddev
->unit
== unit
) {
522 spin_unlock(&all_mddevs_lock
);
528 list_add(&new->all_mddevs
, &all_mddevs
);
529 spin_unlock(&all_mddevs_lock
);
530 new->hold_active
= UNTIL_IOCTL
;
534 /* find an unused unit number */
535 static int next_minor
= 512;
536 int start
= next_minor
;
540 dev
= MKDEV(MD_MAJOR
, next_minor
);
542 if (next_minor
> MINORMASK
)
544 if (next_minor
== start
) {
545 /* Oh dear, all in use. */
546 spin_unlock(&all_mddevs_lock
);
552 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
553 if (mddev
->unit
== dev
) {
559 new->md_minor
= MINOR(dev
);
560 new->hold_active
= UNTIL_STOP
;
561 list_add(&new->all_mddevs
, &all_mddevs
);
562 spin_unlock(&all_mddevs_lock
);
565 spin_unlock(&all_mddevs_lock
);
567 new = kzalloc(sizeof(*new), GFP_KERNEL
);
572 if (MAJOR(unit
) == MD_MAJOR
)
573 new->md_minor
= MINOR(unit
);
575 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
582 static struct attribute_group md_redundancy_group
;
584 void mddev_unlock(struct mddev
*mddev
)
586 if (mddev
->to_remove
) {
587 /* These cannot be removed under reconfig_mutex as
588 * an access to the files will try to take reconfig_mutex
589 * while holding the file unremovable, which leads to
591 * So hold set sysfs_active while the remove in happeing,
592 * and anything else which might set ->to_remove or my
593 * otherwise change the sysfs namespace will fail with
594 * -EBUSY if sysfs_active is still set.
595 * We set sysfs_active under reconfig_mutex and elsewhere
596 * test it under the same mutex to ensure its correct value
599 struct attribute_group
*to_remove
= mddev
->to_remove
;
600 mddev
->to_remove
= NULL
;
601 mddev
->sysfs_active
= 1;
602 mutex_unlock(&mddev
->reconfig_mutex
);
604 if (mddev
->kobj
.sd
) {
605 if (to_remove
!= &md_redundancy_group
)
606 sysfs_remove_group(&mddev
->kobj
, to_remove
);
607 if (mddev
->pers
== NULL
||
608 mddev
->pers
->sync_request
== NULL
) {
609 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
610 if (mddev
->sysfs_action
)
611 sysfs_put(mddev
->sysfs_action
);
612 mddev
->sysfs_action
= NULL
;
615 mddev
->sysfs_active
= 0;
617 mutex_unlock(&mddev
->reconfig_mutex
);
619 /* As we've dropped the mutex we need a spinlock to
620 * make sure the thread doesn't disappear
622 spin_lock(&pers_lock
);
623 md_wakeup_thread(mddev
->thread
);
624 spin_unlock(&pers_lock
);
626 EXPORT_SYMBOL_GPL(mddev_unlock
);
628 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
630 struct md_rdev
*rdev
;
632 rdev_for_each_rcu(rdev
, mddev
)
633 if (rdev
->desc_nr
== nr
)
638 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
640 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
642 struct md_rdev
*rdev
;
644 rdev_for_each(rdev
, mddev
)
645 if (rdev
->bdev
->bd_dev
== dev
)
651 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
653 struct md_rdev
*rdev
;
655 rdev_for_each_rcu(rdev
, mddev
)
656 if (rdev
->bdev
->bd_dev
== dev
)
662 static struct md_personality
*find_pers(int level
, char *clevel
)
664 struct md_personality
*pers
;
665 list_for_each_entry(pers
, &pers_list
, list
) {
666 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
668 if (strcmp(pers
->name
, clevel
)==0)
674 /* return the offset of the super block in 512byte sectors */
675 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
677 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
678 return MD_NEW_SIZE_SECTORS(num_sectors
);
681 static int alloc_disk_sb(struct md_rdev
*rdev
)
683 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
684 if (!rdev
->sb_page
) {
685 printk(KERN_ALERT
"md: out of memory.\n");
692 void md_rdev_clear(struct md_rdev
*rdev
)
695 put_page(rdev
->sb_page
);
697 rdev
->sb_page
= NULL
;
702 put_page(rdev
->bb_page
);
703 rdev
->bb_page
= NULL
;
705 badblocks_exit(&rdev
->badblocks
);
707 EXPORT_SYMBOL_GPL(md_rdev_clear
);
709 static void super_written(struct bio
*bio
)
711 struct md_rdev
*rdev
= bio
->bi_private
;
712 struct mddev
*mddev
= rdev
->mddev
;
715 printk("md: super_written gets error=%d\n", bio
->bi_error
);
716 md_error(mddev
, rdev
);
719 if (atomic_dec_and_test(&mddev
->pending_writes
))
720 wake_up(&mddev
->sb_wait
);
724 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
725 sector_t sector
, int size
, struct page
*page
)
727 /* write first size bytes of page to sector of rdev
728 * Increment mddev->pending_writes before returning
729 * and decrement it on completion, waking up sb_wait
730 * if zero is reached.
731 * If an error occurred, call md_error
733 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
735 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
736 bio
->bi_iter
.bi_sector
= sector
;
737 bio_add_page(bio
, page
, size
, 0);
738 bio
->bi_private
= rdev
;
739 bio
->bi_end_io
= super_written
;
741 atomic_inc(&mddev
->pending_writes
);
742 submit_bio(WRITE_FLUSH_FUA
, bio
);
745 void md_super_wait(struct mddev
*mddev
)
747 /* wait for all superblock writes that were scheduled to complete */
748 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
751 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
752 struct page
*page
, int rw
, bool metadata_op
)
754 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
757 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
758 rdev
->meta_bdev
: rdev
->bdev
;
760 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
761 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
762 (rdev
->mddev
->reshape_backwards
==
763 (sector
>= rdev
->mddev
->reshape_position
)))
764 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
766 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
767 bio_add_page(bio
, page
, size
, 0);
768 submit_bio_wait(rw
, bio
);
770 ret
= !bio
->bi_error
;
774 EXPORT_SYMBOL_GPL(sync_page_io
);
776 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
778 char b
[BDEVNAME_SIZE
];
783 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
789 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
790 bdevname(rdev
->bdev
,b
));
794 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
796 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
797 sb1
->set_uuid1
== sb2
->set_uuid1
&&
798 sb1
->set_uuid2
== sb2
->set_uuid2
&&
799 sb1
->set_uuid3
== sb2
->set_uuid3
;
802 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
805 mdp_super_t
*tmp1
, *tmp2
;
807 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
808 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
810 if (!tmp1
|| !tmp2
) {
812 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
820 * nr_disks is not constant
825 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
832 static u32
md_csum_fold(u32 csum
)
834 csum
= (csum
& 0xffff) + (csum
>> 16);
835 return (csum
& 0xffff) + (csum
>> 16);
838 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
841 u32
*sb32
= (u32
*)sb
;
843 unsigned int disk_csum
, csum
;
845 disk_csum
= sb
->sb_csum
;
848 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
850 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
853 /* This used to use csum_partial, which was wrong for several
854 * reasons including that different results are returned on
855 * different architectures. It isn't critical that we get exactly
856 * the same return value as before (we always csum_fold before
857 * testing, and that removes any differences). However as we
858 * know that csum_partial always returned a 16bit value on
859 * alphas, do a fold to maximise conformity to previous behaviour.
861 sb
->sb_csum
= md_csum_fold(disk_csum
);
863 sb
->sb_csum
= disk_csum
;
869 * Handle superblock details.
870 * We want to be able to handle multiple superblock formats
871 * so we have a common interface to them all, and an array of
872 * different handlers.
873 * We rely on user-space to write the initial superblock, and support
874 * reading and updating of superblocks.
875 * Interface methods are:
876 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
877 * loads and validates a superblock on dev.
878 * if refdev != NULL, compare superblocks on both devices
880 * 0 - dev has a superblock that is compatible with refdev
881 * 1 - dev has a superblock that is compatible and newer than refdev
882 * so dev should be used as the refdev in future
883 * -EINVAL superblock incompatible or invalid
884 * -othererror e.g. -EIO
886 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
887 * Verify that dev is acceptable into mddev.
888 * The first time, mddev->raid_disks will be 0, and data from
889 * dev should be merged in. Subsequent calls check that dev
890 * is new enough. Return 0 or -EINVAL
892 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
893 * Update the superblock for rdev with data in mddev
894 * This does not write to disc.
900 struct module
*owner
;
901 int (*load_super
)(struct md_rdev
*rdev
,
902 struct md_rdev
*refdev
,
904 int (*validate_super
)(struct mddev
*mddev
,
905 struct md_rdev
*rdev
);
906 void (*sync_super
)(struct mddev
*mddev
,
907 struct md_rdev
*rdev
);
908 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
909 sector_t num_sectors
);
910 int (*allow_new_offset
)(struct md_rdev
*rdev
,
911 unsigned long long new_offset
);
915 * Check that the given mddev has no bitmap.
917 * This function is called from the run method of all personalities that do not
918 * support bitmaps. It prints an error message and returns non-zero if mddev
919 * has a bitmap. Otherwise, it returns 0.
922 int md_check_no_bitmap(struct mddev
*mddev
)
924 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
926 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
927 mdname(mddev
), mddev
->pers
->name
);
930 EXPORT_SYMBOL(md_check_no_bitmap
);
933 * load_super for 0.90.0
935 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
937 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
942 * Calculate the position of the superblock (512byte sectors),
943 * it's at the end of the disk.
945 * It also happens to be a multiple of 4Kb.
947 rdev
->sb_start
= calc_dev_sboffset(rdev
);
949 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
954 bdevname(rdev
->bdev
, b
);
955 sb
= page_address(rdev
->sb_page
);
957 if (sb
->md_magic
!= MD_SB_MAGIC
) {
958 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
963 if (sb
->major_version
!= 0 ||
964 sb
->minor_version
< 90 ||
965 sb
->minor_version
> 91) {
966 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
967 sb
->major_version
, sb
->minor_version
,
972 if (sb
->raid_disks
<= 0)
975 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
976 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
981 rdev
->preferred_minor
= sb
->md_minor
;
982 rdev
->data_offset
= 0;
983 rdev
->new_data_offset
= 0;
984 rdev
->sb_size
= MD_SB_BYTES
;
985 rdev
->badblocks
.shift
= -1;
987 if (sb
->level
== LEVEL_MULTIPATH
)
990 rdev
->desc_nr
= sb
->this_disk
.number
;
996 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
997 if (!uuid_equal(refsb
, sb
)) {
998 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
999 b
, bdevname(refdev
->bdev
,b2
));
1002 if (!sb_equal(refsb
, sb
)) {
1003 printk(KERN_WARNING
"md: %s has same UUID"
1004 " but different superblock to %s\n",
1005 b
, bdevname(refdev
->bdev
, b2
));
1009 ev2
= md_event(refsb
);
1015 rdev
->sectors
= rdev
->sb_start
;
1016 /* Limit to 4TB as metadata cannot record more than that.
1017 * (not needed for Linear and RAID0 as metadata doesn't
1020 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1022 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1024 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1025 /* "this cannot possibly happen" ... */
1033 * validate_super for 0.90.0
1035 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1038 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1039 __u64 ev1
= md_event(sb
);
1041 rdev
->raid_disk
= -1;
1042 clear_bit(Faulty
, &rdev
->flags
);
1043 clear_bit(In_sync
, &rdev
->flags
);
1044 clear_bit(Bitmap_sync
, &rdev
->flags
);
1045 clear_bit(WriteMostly
, &rdev
->flags
);
1047 if (mddev
->raid_disks
== 0) {
1048 mddev
->major_version
= 0;
1049 mddev
->minor_version
= sb
->minor_version
;
1050 mddev
->patch_version
= sb
->patch_version
;
1051 mddev
->external
= 0;
1052 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1053 mddev
->ctime
= sb
->ctime
;
1054 mddev
->utime
= sb
->utime
;
1055 mddev
->level
= sb
->level
;
1056 mddev
->clevel
[0] = 0;
1057 mddev
->layout
= sb
->layout
;
1058 mddev
->raid_disks
= sb
->raid_disks
;
1059 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1060 mddev
->events
= ev1
;
1061 mddev
->bitmap_info
.offset
= 0;
1062 mddev
->bitmap_info
.space
= 0;
1063 /* bitmap can use 60 K after the 4K superblocks */
1064 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1065 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1066 mddev
->reshape_backwards
= 0;
1068 if (mddev
->minor_version
>= 91) {
1069 mddev
->reshape_position
= sb
->reshape_position
;
1070 mddev
->delta_disks
= sb
->delta_disks
;
1071 mddev
->new_level
= sb
->new_level
;
1072 mddev
->new_layout
= sb
->new_layout
;
1073 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1074 if (mddev
->delta_disks
< 0)
1075 mddev
->reshape_backwards
= 1;
1077 mddev
->reshape_position
= MaxSector
;
1078 mddev
->delta_disks
= 0;
1079 mddev
->new_level
= mddev
->level
;
1080 mddev
->new_layout
= mddev
->layout
;
1081 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1084 if (sb
->state
& (1<<MD_SB_CLEAN
))
1085 mddev
->recovery_cp
= MaxSector
;
1087 if (sb
->events_hi
== sb
->cp_events_hi
&&
1088 sb
->events_lo
== sb
->cp_events_lo
) {
1089 mddev
->recovery_cp
= sb
->recovery_cp
;
1091 mddev
->recovery_cp
= 0;
1094 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1095 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1096 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1097 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1099 mddev
->max_disks
= MD_SB_DISKS
;
1101 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1102 mddev
->bitmap_info
.file
== NULL
) {
1103 mddev
->bitmap_info
.offset
=
1104 mddev
->bitmap_info
.default_offset
;
1105 mddev
->bitmap_info
.space
=
1106 mddev
->bitmap_info
.default_space
;
1109 } else if (mddev
->pers
== NULL
) {
1110 /* Insist on good event counter while assembling, except
1111 * for spares (which don't need an event count) */
1113 if (sb
->disks
[rdev
->desc_nr
].state
& (
1114 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1115 if (ev1
< mddev
->events
)
1117 } else if (mddev
->bitmap
) {
1118 /* if adding to array with a bitmap, then we can accept an
1119 * older device ... but not too old.
1121 if (ev1
< mddev
->bitmap
->events_cleared
)
1123 if (ev1
< mddev
->events
)
1124 set_bit(Bitmap_sync
, &rdev
->flags
);
1126 if (ev1
< mddev
->events
)
1127 /* just a hot-add of a new device, leave raid_disk at -1 */
1131 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1132 desc
= sb
->disks
+ rdev
->desc_nr
;
1134 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1135 set_bit(Faulty
, &rdev
->flags
);
1136 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1137 desc->raid_disk < mddev->raid_disks */) {
1138 set_bit(In_sync
, &rdev
->flags
);
1139 rdev
->raid_disk
= desc
->raid_disk
;
1140 rdev
->saved_raid_disk
= desc
->raid_disk
;
1141 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1142 /* active but not in sync implies recovery up to
1143 * reshape position. We don't know exactly where
1144 * that is, so set to zero for now */
1145 if (mddev
->minor_version
>= 91) {
1146 rdev
->recovery_offset
= 0;
1147 rdev
->raid_disk
= desc
->raid_disk
;
1150 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1151 set_bit(WriteMostly
, &rdev
->flags
);
1152 } else /* MULTIPATH are always insync */
1153 set_bit(In_sync
, &rdev
->flags
);
1158 * sync_super for 0.90.0
1160 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1163 struct md_rdev
*rdev2
;
1164 int next_spare
= mddev
->raid_disks
;
1166 /* make rdev->sb match mddev data..
1169 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1170 * 3/ any empty disks < next_spare become removed
1172 * disks[0] gets initialised to REMOVED because
1173 * we cannot be sure from other fields if it has
1174 * been initialised or not.
1177 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1179 rdev
->sb_size
= MD_SB_BYTES
;
1181 sb
= page_address(rdev
->sb_page
);
1183 memset(sb
, 0, sizeof(*sb
));
1185 sb
->md_magic
= MD_SB_MAGIC
;
1186 sb
->major_version
= mddev
->major_version
;
1187 sb
->patch_version
= mddev
->patch_version
;
1188 sb
->gvalid_words
= 0; /* ignored */
1189 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1190 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1191 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1192 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1194 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1195 sb
->level
= mddev
->level
;
1196 sb
->size
= mddev
->dev_sectors
/ 2;
1197 sb
->raid_disks
= mddev
->raid_disks
;
1198 sb
->md_minor
= mddev
->md_minor
;
1199 sb
->not_persistent
= 0;
1200 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1202 sb
->events_hi
= (mddev
->events
>>32);
1203 sb
->events_lo
= (u32
)mddev
->events
;
1205 if (mddev
->reshape_position
== MaxSector
)
1206 sb
->minor_version
= 90;
1208 sb
->minor_version
= 91;
1209 sb
->reshape_position
= mddev
->reshape_position
;
1210 sb
->new_level
= mddev
->new_level
;
1211 sb
->delta_disks
= mddev
->delta_disks
;
1212 sb
->new_layout
= mddev
->new_layout
;
1213 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1215 mddev
->minor_version
= sb
->minor_version
;
1218 sb
->recovery_cp
= mddev
->recovery_cp
;
1219 sb
->cp_events_hi
= (mddev
->events
>>32);
1220 sb
->cp_events_lo
= (u32
)mddev
->events
;
1221 if (mddev
->recovery_cp
== MaxSector
)
1222 sb
->state
= (1<< MD_SB_CLEAN
);
1224 sb
->recovery_cp
= 0;
1226 sb
->layout
= mddev
->layout
;
1227 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1229 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1230 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1232 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1233 rdev_for_each(rdev2
, mddev
) {
1236 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1238 if (rdev2
->raid_disk
>= 0 &&
1239 sb
->minor_version
>= 91)
1240 /* we have nowhere to store the recovery_offset,
1241 * but if it is not below the reshape_position,
1242 * we can piggy-back on that.
1245 if (rdev2
->raid_disk
< 0 ||
1246 test_bit(Faulty
, &rdev2
->flags
))
1249 desc_nr
= rdev2
->raid_disk
;
1251 desc_nr
= next_spare
++;
1252 rdev2
->desc_nr
= desc_nr
;
1253 d
= &sb
->disks
[rdev2
->desc_nr
];
1255 d
->number
= rdev2
->desc_nr
;
1256 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1257 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1259 d
->raid_disk
= rdev2
->raid_disk
;
1261 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1262 if (test_bit(Faulty
, &rdev2
->flags
))
1263 d
->state
= (1<<MD_DISK_FAULTY
);
1264 else if (is_active
) {
1265 d
->state
= (1<<MD_DISK_ACTIVE
);
1266 if (test_bit(In_sync
, &rdev2
->flags
))
1267 d
->state
|= (1<<MD_DISK_SYNC
);
1275 if (test_bit(WriteMostly
, &rdev2
->flags
))
1276 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1278 /* now set the "removed" and "faulty" bits on any missing devices */
1279 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1280 mdp_disk_t
*d
= &sb
->disks
[i
];
1281 if (d
->state
== 0 && d
->number
== 0) {
1284 d
->state
= (1<<MD_DISK_REMOVED
);
1285 d
->state
|= (1<<MD_DISK_FAULTY
);
1289 sb
->nr_disks
= nr_disks
;
1290 sb
->active_disks
= active
;
1291 sb
->working_disks
= working
;
1292 sb
->failed_disks
= failed
;
1293 sb
->spare_disks
= spare
;
1295 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1296 sb
->sb_csum
= calc_sb_csum(sb
);
1300 * rdev_size_change for 0.90.0
1302 static unsigned long long
1303 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1305 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1306 return 0; /* component must fit device */
1307 if (rdev
->mddev
->bitmap_info
.offset
)
1308 return 0; /* can't move bitmap */
1309 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1310 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1311 num_sectors
= rdev
->sb_start
;
1312 /* Limit to 4TB as metadata cannot record more than that.
1313 * 4TB == 2^32 KB, or 2*2^32 sectors.
1315 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1316 rdev
->mddev
->level
>= 1)
1317 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1318 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1320 md_super_wait(rdev
->mddev
);
1325 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1327 /* non-zero offset changes not possible with v0.90 */
1328 return new_offset
== 0;
1332 * version 1 superblock
1335 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1339 unsigned long long newcsum
;
1340 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1341 __le32
*isuper
= (__le32
*)sb
;
1343 disk_csum
= sb
->sb_csum
;
1346 for (; size
>= 4; size
-= 4)
1347 newcsum
+= le32_to_cpu(*isuper
++);
1350 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1352 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1353 sb
->sb_csum
= disk_csum
;
1354 return cpu_to_le32(csum
);
1357 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1359 struct mdp_superblock_1
*sb
;
1363 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1367 * Calculate the position of the superblock in 512byte sectors.
1368 * It is always aligned to a 4K boundary and
1369 * depeding on minor_version, it can be:
1370 * 0: At least 8K, but less than 12K, from end of device
1371 * 1: At start of device
1372 * 2: 4K from start of device.
1374 switch(minor_version
) {
1376 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1378 sb_start
&= ~(sector_t
)(4*2-1);
1389 rdev
->sb_start
= sb_start
;
1391 /* superblock is rarely larger than 1K, but it can be larger,
1392 * and it is safe to read 4k, so we do that
1394 ret
= read_disk_sb(rdev
, 4096);
1395 if (ret
) return ret
;
1397 sb
= page_address(rdev
->sb_page
);
1399 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1400 sb
->major_version
!= cpu_to_le32(1) ||
1401 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1402 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1403 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1406 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1407 printk("md: invalid superblock checksum on %s\n",
1408 bdevname(rdev
->bdev
,b
));
1411 if (le64_to_cpu(sb
->data_size
) < 10) {
1412 printk("md: data_size too small on %s\n",
1413 bdevname(rdev
->bdev
,b
));
1418 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1419 /* Some padding is non-zero, might be a new feature */
1422 rdev
->preferred_minor
= 0xffff;
1423 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1424 rdev
->new_data_offset
= rdev
->data_offset
;
1425 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1426 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1427 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1428 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1430 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1431 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1432 if (rdev
->sb_size
& bmask
)
1433 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1436 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1439 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1442 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1445 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1447 if (!rdev
->bb_page
) {
1448 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1452 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1453 rdev
->badblocks
.count
== 0) {
1454 /* need to load the bad block list.
1455 * Currently we limit it to one page.
1461 int sectors
= le16_to_cpu(sb
->bblog_size
);
1462 if (sectors
> (PAGE_SIZE
/ 512))
1464 offset
= le32_to_cpu(sb
->bblog_offset
);
1467 bb_sector
= (long long)offset
;
1468 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1469 rdev
->bb_page
, READ
, true))
1471 bbp
= (u64
*)page_address(rdev
->bb_page
);
1472 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1473 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1474 u64 bb
= le64_to_cpu(*bbp
);
1475 int count
= bb
& (0x3ff);
1476 u64 sector
= bb
>> 10;
1477 sector
<<= sb
->bblog_shift
;
1478 count
<<= sb
->bblog_shift
;
1481 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1484 } else if (sb
->bblog_offset
!= 0)
1485 rdev
->badblocks
.shift
= 0;
1491 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1493 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1494 sb
->level
!= refsb
->level
||
1495 sb
->layout
!= refsb
->layout
||
1496 sb
->chunksize
!= refsb
->chunksize
) {
1497 printk(KERN_WARNING
"md: %s has strangely different"
1498 " superblock to %s\n",
1499 bdevname(rdev
->bdev
,b
),
1500 bdevname(refdev
->bdev
,b2
));
1503 ev1
= le64_to_cpu(sb
->events
);
1504 ev2
= le64_to_cpu(refsb
->events
);
1511 if (minor_version
) {
1512 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1513 sectors
-= rdev
->data_offset
;
1515 sectors
= rdev
->sb_start
;
1516 if (sectors
< le64_to_cpu(sb
->data_size
))
1518 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1522 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1524 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1525 __u64 ev1
= le64_to_cpu(sb
->events
);
1527 rdev
->raid_disk
= -1;
1528 clear_bit(Faulty
, &rdev
->flags
);
1529 clear_bit(In_sync
, &rdev
->flags
);
1530 clear_bit(Bitmap_sync
, &rdev
->flags
);
1531 clear_bit(WriteMostly
, &rdev
->flags
);
1533 if (mddev
->raid_disks
== 0) {
1534 mddev
->major_version
= 1;
1535 mddev
->patch_version
= 0;
1536 mddev
->external
= 0;
1537 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1538 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1539 mddev
->utime
= le64_to_cpu(sb
->utime
);
1540 mddev
->level
= le32_to_cpu(sb
->level
);
1541 mddev
->clevel
[0] = 0;
1542 mddev
->layout
= le32_to_cpu(sb
->layout
);
1543 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1544 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1545 mddev
->events
= ev1
;
1546 mddev
->bitmap_info
.offset
= 0;
1547 mddev
->bitmap_info
.space
= 0;
1548 /* Default location for bitmap is 1K after superblock
1549 * using 3K - total of 4K
1551 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1552 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1553 mddev
->reshape_backwards
= 0;
1555 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1556 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1558 mddev
->max_disks
= (4096-256)/2;
1560 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1561 mddev
->bitmap_info
.file
== NULL
) {
1562 mddev
->bitmap_info
.offset
=
1563 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1564 /* Metadata doesn't record how much space is available.
1565 * For 1.0, we assume we can use up to the superblock
1566 * if before, else to 4K beyond superblock.
1567 * For others, assume no change is possible.
1569 if (mddev
->minor_version
> 0)
1570 mddev
->bitmap_info
.space
= 0;
1571 else if (mddev
->bitmap_info
.offset
> 0)
1572 mddev
->bitmap_info
.space
=
1573 8 - mddev
->bitmap_info
.offset
;
1575 mddev
->bitmap_info
.space
=
1576 -mddev
->bitmap_info
.offset
;
1579 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1580 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1581 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1582 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1583 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1584 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1585 if (mddev
->delta_disks
< 0 ||
1586 (mddev
->delta_disks
== 0 &&
1587 (le32_to_cpu(sb
->feature_map
)
1588 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1589 mddev
->reshape_backwards
= 1;
1591 mddev
->reshape_position
= MaxSector
;
1592 mddev
->delta_disks
= 0;
1593 mddev
->new_level
= mddev
->level
;
1594 mddev
->new_layout
= mddev
->layout
;
1595 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1598 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
) {
1599 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1600 if (mddev
->recovery_cp
== MaxSector
)
1601 set_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
);
1603 } else if (mddev
->pers
== NULL
) {
1604 /* Insist of good event counter while assembling, except for
1605 * spares (which don't need an event count) */
1607 if (rdev
->desc_nr
>= 0 &&
1608 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1609 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1610 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1611 if (ev1
< mddev
->events
)
1613 } else if (mddev
->bitmap
) {
1614 /* If adding to array with a bitmap, then we can accept an
1615 * older device, but not too old.
1617 if (ev1
< mddev
->bitmap
->events_cleared
)
1619 if (ev1
< mddev
->events
)
1620 set_bit(Bitmap_sync
, &rdev
->flags
);
1622 if (ev1
< mddev
->events
)
1623 /* just a hot-add of a new device, leave raid_disk at -1 */
1626 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1628 if (rdev
->desc_nr
< 0 ||
1629 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1630 role
= MD_DISK_ROLE_SPARE
;
1633 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1635 case MD_DISK_ROLE_SPARE
: /* spare */
1637 case MD_DISK_ROLE_FAULTY
: /* faulty */
1638 set_bit(Faulty
, &rdev
->flags
);
1640 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1641 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1642 /* journal device without journal feature */
1644 "md: journal device provided without journal feature, ignoring the device\n");
1647 set_bit(Journal
, &rdev
->flags
);
1648 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1649 rdev
->raid_disk
= 0;
1652 rdev
->saved_raid_disk
= role
;
1653 if ((le32_to_cpu(sb
->feature_map
) &
1654 MD_FEATURE_RECOVERY_OFFSET
)) {
1655 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1656 if (!(le32_to_cpu(sb
->feature_map
) &
1657 MD_FEATURE_RECOVERY_BITMAP
))
1658 rdev
->saved_raid_disk
= -1;
1660 set_bit(In_sync
, &rdev
->flags
);
1661 rdev
->raid_disk
= role
;
1664 if (sb
->devflags
& WriteMostly1
)
1665 set_bit(WriteMostly
, &rdev
->flags
);
1666 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1667 set_bit(Replacement
, &rdev
->flags
);
1668 } else /* MULTIPATH are always insync */
1669 set_bit(In_sync
, &rdev
->flags
);
1674 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1676 struct mdp_superblock_1
*sb
;
1677 struct md_rdev
*rdev2
;
1679 /* make rdev->sb match mddev and rdev data. */
1681 sb
= page_address(rdev
->sb_page
);
1683 sb
->feature_map
= 0;
1685 sb
->recovery_offset
= cpu_to_le64(0);
1686 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1688 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1689 sb
->events
= cpu_to_le64(mddev
->events
);
1691 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1692 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1693 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1695 sb
->resync_offset
= cpu_to_le64(0);
1697 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1699 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1700 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1701 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1702 sb
->level
= cpu_to_le32(mddev
->level
);
1703 sb
->layout
= cpu_to_le32(mddev
->layout
);
1705 if (test_bit(WriteMostly
, &rdev
->flags
))
1706 sb
->devflags
|= WriteMostly1
;
1708 sb
->devflags
&= ~WriteMostly1
;
1709 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1710 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1712 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1713 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1714 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1717 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1718 !test_bit(In_sync
, &rdev
->flags
)) {
1720 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1721 sb
->recovery_offset
=
1722 cpu_to_le64(rdev
->recovery_offset
);
1723 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1725 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1727 /* Note: recovery_offset and journal_tail share space */
1728 if (test_bit(Journal
, &rdev
->flags
))
1729 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1730 if (test_bit(Replacement
, &rdev
->flags
))
1732 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1734 if (mddev
->reshape_position
!= MaxSector
) {
1735 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1736 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1737 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1738 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1739 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1740 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1741 if (mddev
->delta_disks
== 0 &&
1742 mddev
->reshape_backwards
)
1744 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1745 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1747 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1748 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1749 - rdev
->data_offset
));
1753 if (mddev_is_clustered(mddev
))
1754 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1756 if (rdev
->badblocks
.count
== 0)
1757 /* Nothing to do for bad blocks*/ ;
1758 else if (sb
->bblog_offset
== 0)
1759 /* Cannot record bad blocks on this device */
1760 md_error(mddev
, rdev
);
1762 struct badblocks
*bb
= &rdev
->badblocks
;
1763 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1765 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1770 seq
= read_seqbegin(&bb
->lock
);
1772 memset(bbp
, 0xff, PAGE_SIZE
);
1774 for (i
= 0 ; i
< bb
->count
; i
++) {
1775 u64 internal_bb
= p
[i
];
1776 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1777 | BB_LEN(internal_bb
));
1778 bbp
[i
] = cpu_to_le64(store_bb
);
1781 if (read_seqretry(&bb
->lock
, seq
))
1784 bb
->sector
= (rdev
->sb_start
+
1785 (int)le32_to_cpu(sb
->bblog_offset
));
1786 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1791 rdev_for_each(rdev2
, mddev
)
1792 if (rdev2
->desc_nr
+1 > max_dev
)
1793 max_dev
= rdev2
->desc_nr
+1;
1795 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1797 sb
->max_dev
= cpu_to_le32(max_dev
);
1798 rdev
->sb_size
= max_dev
* 2 + 256;
1799 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1800 if (rdev
->sb_size
& bmask
)
1801 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1803 max_dev
= le32_to_cpu(sb
->max_dev
);
1805 for (i
=0; i
<max_dev
;i
++)
1806 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1808 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1809 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1811 rdev_for_each(rdev2
, mddev
) {
1813 if (test_bit(Faulty
, &rdev2
->flags
))
1814 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1815 else if (test_bit(In_sync
, &rdev2
->flags
))
1816 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1817 else if (test_bit(Journal
, &rdev2
->flags
))
1818 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1819 else if (rdev2
->raid_disk
>= 0)
1820 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1822 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1825 sb
->sb_csum
= calc_sb_1_csum(sb
);
1828 static unsigned long long
1829 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1831 struct mdp_superblock_1
*sb
;
1832 sector_t max_sectors
;
1833 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1834 return 0; /* component must fit device */
1835 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1836 return 0; /* too confusing */
1837 if (rdev
->sb_start
< rdev
->data_offset
) {
1838 /* minor versions 1 and 2; superblock before data */
1839 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1840 max_sectors
-= rdev
->data_offset
;
1841 if (!num_sectors
|| num_sectors
> max_sectors
)
1842 num_sectors
= max_sectors
;
1843 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1844 /* minor version 0 with bitmap we can't move */
1847 /* minor version 0; superblock after data */
1849 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1850 sb_start
&= ~(sector_t
)(4*2 - 1);
1851 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1852 if (!num_sectors
|| num_sectors
> max_sectors
)
1853 num_sectors
= max_sectors
;
1854 rdev
->sb_start
= sb_start
;
1856 sb
= page_address(rdev
->sb_page
);
1857 sb
->data_size
= cpu_to_le64(num_sectors
);
1858 sb
->super_offset
= rdev
->sb_start
;
1859 sb
->sb_csum
= calc_sb_1_csum(sb
);
1860 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1862 md_super_wait(rdev
->mddev
);
1868 super_1_allow_new_offset(struct md_rdev
*rdev
,
1869 unsigned long long new_offset
)
1871 /* All necessary checks on new >= old have been done */
1872 struct bitmap
*bitmap
;
1873 if (new_offset
>= rdev
->data_offset
)
1876 /* with 1.0 metadata, there is no metadata to tread on
1877 * so we can always move back */
1878 if (rdev
->mddev
->minor_version
== 0)
1881 /* otherwise we must be sure not to step on
1882 * any metadata, so stay:
1883 * 36K beyond start of superblock
1884 * beyond end of badblocks
1885 * beyond write-intent bitmap
1887 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1889 bitmap
= rdev
->mddev
->bitmap
;
1890 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1891 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1892 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1894 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1900 static struct super_type super_types
[] = {
1903 .owner
= THIS_MODULE
,
1904 .load_super
= super_90_load
,
1905 .validate_super
= super_90_validate
,
1906 .sync_super
= super_90_sync
,
1907 .rdev_size_change
= super_90_rdev_size_change
,
1908 .allow_new_offset
= super_90_allow_new_offset
,
1912 .owner
= THIS_MODULE
,
1913 .load_super
= super_1_load
,
1914 .validate_super
= super_1_validate
,
1915 .sync_super
= super_1_sync
,
1916 .rdev_size_change
= super_1_rdev_size_change
,
1917 .allow_new_offset
= super_1_allow_new_offset
,
1921 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1923 if (mddev
->sync_super
) {
1924 mddev
->sync_super(mddev
, rdev
);
1928 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1930 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1933 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1935 struct md_rdev
*rdev
, *rdev2
;
1938 rdev_for_each_rcu(rdev
, mddev1
) {
1939 if (test_bit(Faulty
, &rdev
->flags
) ||
1940 test_bit(Journal
, &rdev
->flags
) ||
1941 rdev
->raid_disk
== -1)
1943 rdev_for_each_rcu(rdev2
, mddev2
) {
1944 if (test_bit(Faulty
, &rdev2
->flags
) ||
1945 test_bit(Journal
, &rdev2
->flags
) ||
1946 rdev2
->raid_disk
== -1)
1948 if (rdev
->bdev
->bd_contains
==
1949 rdev2
->bdev
->bd_contains
) {
1959 static LIST_HEAD(pending_raid_disks
);
1962 * Try to register data integrity profile for an mddev
1964 * This is called when an array is started and after a disk has been kicked
1965 * from the array. It only succeeds if all working and active component devices
1966 * are integrity capable with matching profiles.
1968 int md_integrity_register(struct mddev
*mddev
)
1970 struct md_rdev
*rdev
, *reference
= NULL
;
1972 if (list_empty(&mddev
->disks
))
1973 return 0; /* nothing to do */
1974 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1975 return 0; /* shouldn't register, or already is */
1976 rdev_for_each(rdev
, mddev
) {
1977 /* skip spares and non-functional disks */
1978 if (test_bit(Faulty
, &rdev
->flags
))
1980 if (rdev
->raid_disk
< 0)
1983 /* Use the first rdev as the reference */
1987 /* does this rdev's profile match the reference profile? */
1988 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1989 rdev
->bdev
->bd_disk
) < 0)
1992 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1995 * All component devices are integrity capable and have matching
1996 * profiles, register the common profile for the md device.
1998 blk_integrity_register(mddev
->gendisk
,
1999 bdev_get_integrity(reference
->bdev
));
2001 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2002 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2003 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2009 EXPORT_SYMBOL(md_integrity_register
);
2012 * Attempt to add an rdev, but only if it is consistent with the current
2015 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2017 struct blk_integrity
*bi_rdev
;
2018 struct blk_integrity
*bi_mddev
;
2019 char name
[BDEVNAME_SIZE
];
2021 if (!mddev
->gendisk
)
2024 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2025 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2027 if (!bi_mddev
) /* nothing to do */
2030 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2031 printk(KERN_NOTICE
"%s: incompatible integrity profile for %s\n",
2032 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2038 EXPORT_SYMBOL(md_integrity_add_rdev
);
2040 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2042 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 (!test_bit(Journal
, &rdev
->flags
) &&
2053 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2055 /* Cannot change size, so fail
2056 * If mddev->level <= 0, then we don't care
2057 * about aligning sizes (e.g. linear)
2059 if (mddev
->level
> 0)
2062 mddev
->dev_sectors
= rdev
->sectors
;
2065 /* Verify rdev->desc_nr is unique.
2066 * If it is -1, assign a free number, else
2067 * check number is not in use
2070 if (rdev
->desc_nr
< 0) {
2073 choice
= mddev
->raid_disks
;
2074 while (md_find_rdev_nr_rcu(mddev
, choice
))
2076 rdev
->desc_nr
= choice
;
2078 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2084 if (!test_bit(Journal
, &rdev
->flags
) &&
2085 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2086 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2087 mdname(mddev
), mddev
->max_disks
);
2090 bdevname(rdev
->bdev
,b
);
2091 strreplace(b
, '/', '!');
2093 rdev
->mddev
= mddev
;
2094 printk(KERN_INFO
"md: bind<%s>\n", b
);
2096 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2099 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2100 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2101 /* failure here is OK */;
2102 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2104 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2105 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2107 /* May as well allow recovery to be retried once */
2108 mddev
->recovery_disabled
++;
2113 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2118 static void md_delayed_delete(struct work_struct
*ws
)
2120 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2121 kobject_del(&rdev
->kobj
);
2122 kobject_put(&rdev
->kobj
);
2125 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2127 char b
[BDEVNAME_SIZE
];
2129 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2130 list_del_rcu(&rdev
->same_set
);
2131 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2133 sysfs_remove_link(&rdev
->kobj
, "block");
2134 sysfs_put(rdev
->sysfs_state
);
2135 rdev
->sysfs_state
= NULL
;
2136 rdev
->badblocks
.count
= 0;
2137 /* We need to delay this, otherwise we can deadlock when
2138 * writing to 'remove' to "dev/state". We also need
2139 * to delay it due to rcu usage.
2142 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2143 kobject_get(&rdev
->kobj
);
2144 queue_work(md_misc_wq
, &rdev
->del_work
);
2148 * prevent the device from being mounted, repartitioned or
2149 * otherwise reused by a RAID array (or any other kernel
2150 * subsystem), by bd_claiming the device.
2152 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2155 struct block_device
*bdev
;
2156 char b
[BDEVNAME_SIZE
];
2158 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2159 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2161 printk(KERN_ERR
"md: could not open %s.\n",
2162 __bdevname(dev
, b
));
2163 return PTR_ERR(bdev
);
2169 static void unlock_rdev(struct md_rdev
*rdev
)
2171 struct block_device
*bdev
= rdev
->bdev
;
2173 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2176 void md_autodetect_dev(dev_t dev
);
2178 static void export_rdev(struct md_rdev
*rdev
)
2180 char b
[BDEVNAME_SIZE
];
2182 printk(KERN_INFO
"md: export_rdev(%s)\n",
2183 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 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2195 unbind_rdev_from_array(rdev
);
2198 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2200 static void export_array(struct mddev
*mddev
)
2202 struct md_rdev
*rdev
;
2204 while (!list_empty(&mddev
->disks
)) {
2205 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2207 md_kick_rdev_from_array(rdev
);
2209 mddev
->raid_disks
= 0;
2210 mddev
->major_version
= 0;
2213 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2215 /* Update each superblock (in-memory image), but
2216 * if we are allowed to, skip spares which already
2217 * have the right event counter, or have one earlier
2218 * (which would mean they aren't being marked as dirty
2219 * with the rest of the array)
2221 struct md_rdev
*rdev
;
2222 rdev_for_each(rdev
, mddev
) {
2223 if (rdev
->sb_events
== mddev
->events
||
2225 rdev
->raid_disk
< 0 &&
2226 rdev
->sb_events
+1 == mddev
->events
)) {
2227 /* Don't update this superblock */
2228 rdev
->sb_loaded
= 2;
2230 sync_super(mddev
, rdev
);
2231 rdev
->sb_loaded
= 1;
2236 static bool does_sb_need_changing(struct mddev
*mddev
)
2238 struct md_rdev
*rdev
;
2239 struct mdp_superblock_1
*sb
;
2242 /* Find a good rdev */
2243 rdev_for_each(rdev
, mddev
)
2244 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2247 /* No good device found. */
2251 sb
= page_address(rdev
->sb_page
);
2252 /* Check if a device has become faulty or a spare become active */
2253 rdev_for_each(rdev
, mddev
) {
2254 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2255 /* Device activated? */
2256 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2257 !test_bit(Faulty
, &rdev
->flags
))
2259 /* Device turned faulty? */
2260 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2264 /* Check if any mddev parameters have changed */
2265 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2266 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2267 (mddev
->layout
!= le64_to_cpu(sb
->layout
)) ||
2268 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2269 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2275 void md_update_sb(struct mddev
*mddev
, int force_change
)
2277 struct md_rdev
*rdev
;
2280 int any_badblocks_changed
= 0;
2285 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2289 if (mddev_is_clustered(mddev
)) {
2290 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2292 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2293 /* Has someone else has updated the sb */
2294 if (!does_sb_need_changing(mddev
)) {
2296 md_cluster_ops
->metadata_update_cancel(mddev
);
2297 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2302 /* First make sure individual recovery_offsets are correct */
2303 rdev_for_each(rdev
, mddev
) {
2304 if (rdev
->raid_disk
>= 0 &&
2305 mddev
->delta_disks
>= 0 &&
2306 !test_bit(Journal
, &rdev
->flags
) &&
2307 !test_bit(In_sync
, &rdev
->flags
) &&
2308 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2309 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2312 if (!mddev
->persistent
) {
2313 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2314 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2315 if (!mddev
->external
) {
2316 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2317 rdev_for_each(rdev
, mddev
) {
2318 if (rdev
->badblocks
.changed
) {
2319 rdev
->badblocks
.changed
= 0;
2320 ack_all_badblocks(&rdev
->badblocks
);
2321 md_error(mddev
, rdev
);
2323 clear_bit(Blocked
, &rdev
->flags
);
2324 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2325 wake_up(&rdev
->blocked_wait
);
2328 wake_up(&mddev
->sb_wait
);
2332 spin_lock(&mddev
->lock
);
2334 mddev
->utime
= ktime_get_real_seconds();
2336 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2338 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2339 /* just a clean<-> dirty transition, possibly leave spares alone,
2340 * though if events isn't the right even/odd, we will have to do
2346 if (mddev
->degraded
)
2347 /* If the array is degraded, then skipping spares is both
2348 * dangerous and fairly pointless.
2349 * Dangerous because a device that was removed from the array
2350 * might have a event_count that still looks up-to-date,
2351 * so it can be re-added without a resync.
2352 * Pointless because if there are any spares to skip,
2353 * then a recovery will happen and soon that array won't
2354 * be degraded any more and the spare can go back to sleep then.
2358 sync_req
= mddev
->in_sync
;
2360 /* If this is just a dirty<->clean transition, and the array is clean
2361 * and 'events' is odd, we can roll back to the previous clean state */
2363 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2364 && mddev
->can_decrease_events
2365 && mddev
->events
!= 1) {
2367 mddev
->can_decrease_events
= 0;
2369 /* otherwise we have to go forward and ... */
2371 mddev
->can_decrease_events
= nospares
;
2375 * This 64-bit counter should never wrap.
2376 * Either we are in around ~1 trillion A.C., assuming
2377 * 1 reboot per second, or we have a bug...
2379 WARN_ON(mddev
->events
== 0);
2381 rdev_for_each(rdev
, mddev
) {
2382 if (rdev
->badblocks
.changed
)
2383 any_badblocks_changed
++;
2384 if (test_bit(Faulty
, &rdev
->flags
))
2385 set_bit(FaultRecorded
, &rdev
->flags
);
2388 sync_sbs(mddev
, nospares
);
2389 spin_unlock(&mddev
->lock
);
2391 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2392 mdname(mddev
), mddev
->in_sync
);
2394 bitmap_update_sb(mddev
->bitmap
);
2395 rdev_for_each(rdev
, mddev
) {
2396 char b
[BDEVNAME_SIZE
];
2398 if (rdev
->sb_loaded
!= 1)
2399 continue; /* no noise on spare devices */
2401 if (!test_bit(Faulty
, &rdev
->flags
)) {
2402 md_super_write(mddev
,rdev
,
2403 rdev
->sb_start
, rdev
->sb_size
,
2405 pr_debug("md: (write) %s's sb offset: %llu\n",
2406 bdevname(rdev
->bdev
, b
),
2407 (unsigned long long)rdev
->sb_start
);
2408 rdev
->sb_events
= mddev
->events
;
2409 if (rdev
->badblocks
.size
) {
2410 md_super_write(mddev
, rdev
,
2411 rdev
->badblocks
.sector
,
2412 rdev
->badblocks
.size
<< 9,
2414 rdev
->badblocks
.size
= 0;
2418 pr_debug("md: %s (skipping faulty)\n",
2419 bdevname(rdev
->bdev
, b
));
2421 if (mddev
->level
== LEVEL_MULTIPATH
)
2422 /* only need to write one superblock... */
2425 md_super_wait(mddev
);
2426 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2428 spin_lock(&mddev
->lock
);
2429 if (mddev
->in_sync
!= sync_req
||
2430 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2431 /* have to write it out again */
2432 spin_unlock(&mddev
->lock
);
2435 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2436 spin_unlock(&mddev
->lock
);
2437 wake_up(&mddev
->sb_wait
);
2438 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2439 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2441 rdev_for_each(rdev
, mddev
) {
2442 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2443 clear_bit(Blocked
, &rdev
->flags
);
2445 if (any_badblocks_changed
)
2446 ack_all_badblocks(&rdev
->badblocks
);
2447 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2448 wake_up(&rdev
->blocked_wait
);
2451 if (mddev_is_clustered(mddev
) && ret
== 0)
2452 md_cluster_ops
->metadata_update_finish(mddev
);
2454 EXPORT_SYMBOL(md_update_sb
);
2456 static int add_bound_rdev(struct md_rdev
*rdev
)
2458 struct mddev
*mddev
= rdev
->mddev
;
2460 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2462 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2463 /* If there is hot_add_disk but no hot_remove_disk
2464 * then added disks for geometry changes,
2465 * and should be added immediately.
2467 super_types
[mddev
->major_version
].
2468 validate_super(mddev
, rdev
);
2470 mddev_suspend(mddev
);
2471 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2473 mddev_resume(mddev
);
2475 unbind_rdev_from_array(rdev
);
2480 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2482 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2483 if (mddev
->degraded
)
2484 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2485 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2486 md_new_event(mddev
);
2487 md_wakeup_thread(mddev
->thread
);
2491 /* words written to sysfs files may, or may not, be \n terminated.
2492 * We want to accept with case. For this we use cmd_match.
2494 static int cmd_match(const char *cmd
, const char *str
)
2496 /* See if cmd, written into a sysfs file, matches
2497 * str. They must either be the same, or cmd can
2498 * have a trailing newline
2500 while (*cmd
&& *str
&& *cmd
== *str
) {
2511 struct rdev_sysfs_entry
{
2512 struct attribute attr
;
2513 ssize_t (*show
)(struct md_rdev
*, char *);
2514 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2518 state_show(struct md_rdev
*rdev
, char *page
)
2522 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2524 if (test_bit(Faulty
, &flags
) ||
2525 rdev
->badblocks
.unacked_exist
) {
2526 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2529 if (test_bit(In_sync
, &flags
)) {
2530 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2533 if (test_bit(Journal
, &flags
)) {
2534 len
+= sprintf(page
+len
, "%sjournal",sep
);
2537 if (test_bit(WriteMostly
, &flags
)) {
2538 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2541 if (test_bit(Blocked
, &flags
) ||
2542 (rdev
->badblocks
.unacked_exist
2543 && !test_bit(Faulty
, &flags
))) {
2544 len
+= sprintf(page
+len
, "%sblocked", sep
);
2547 if (!test_bit(Faulty
, &flags
) &&
2548 !test_bit(Journal
, &flags
) &&
2549 !test_bit(In_sync
, &flags
)) {
2550 len
+= sprintf(page
+len
, "%sspare", sep
);
2553 if (test_bit(WriteErrorSeen
, &flags
)) {
2554 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2557 if (test_bit(WantReplacement
, &flags
)) {
2558 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2561 if (test_bit(Replacement
, &flags
)) {
2562 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2566 return len
+sprintf(page
+len
, "\n");
2570 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2573 * faulty - simulates an error
2574 * remove - disconnects the device
2575 * writemostly - sets write_mostly
2576 * -writemostly - clears write_mostly
2577 * blocked - sets the Blocked flags
2578 * -blocked - clears the Blocked and possibly simulates an error
2579 * insync - sets Insync providing device isn't active
2580 * -insync - clear Insync for a device with a slot assigned,
2581 * so that it gets rebuilt based on bitmap
2582 * write_error - sets WriteErrorSeen
2583 * -write_error - clears WriteErrorSeen
2586 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2587 md_error(rdev
->mddev
, rdev
);
2588 if (test_bit(Faulty
, &rdev
->flags
))
2592 } else if (cmd_match(buf
, "remove")) {
2593 if (rdev
->raid_disk
>= 0)
2596 struct mddev
*mddev
= rdev
->mddev
;
2598 if (mddev_is_clustered(mddev
))
2599 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2602 md_kick_rdev_from_array(rdev
);
2604 md_update_sb(mddev
, 1);
2605 md_new_event(mddev
);
2608 } else if (cmd_match(buf
, "writemostly")) {
2609 set_bit(WriteMostly
, &rdev
->flags
);
2611 } else if (cmd_match(buf
, "-writemostly")) {
2612 clear_bit(WriteMostly
, &rdev
->flags
);
2614 } else if (cmd_match(buf
, "blocked")) {
2615 set_bit(Blocked
, &rdev
->flags
);
2617 } else if (cmd_match(buf
, "-blocked")) {
2618 if (!test_bit(Faulty
, &rdev
->flags
) &&
2619 rdev
->badblocks
.unacked_exist
) {
2620 /* metadata handler doesn't understand badblocks,
2621 * so we need to fail the device
2623 md_error(rdev
->mddev
, rdev
);
2625 clear_bit(Blocked
, &rdev
->flags
);
2626 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2627 wake_up(&rdev
->blocked_wait
);
2628 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2629 md_wakeup_thread(rdev
->mddev
->thread
);
2632 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2633 set_bit(In_sync
, &rdev
->flags
);
2635 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2636 !test_bit(Journal
, &rdev
->flags
)) {
2637 if (rdev
->mddev
->pers
== NULL
) {
2638 clear_bit(In_sync
, &rdev
->flags
);
2639 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2640 rdev
->raid_disk
= -1;
2643 } else if (cmd_match(buf
, "write_error")) {
2644 set_bit(WriteErrorSeen
, &rdev
->flags
);
2646 } else if (cmd_match(buf
, "-write_error")) {
2647 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2649 } else if (cmd_match(buf
, "want_replacement")) {
2650 /* Any non-spare device that is not a replacement can
2651 * become want_replacement at any time, but we then need to
2652 * check if recovery is needed.
2654 if (rdev
->raid_disk
>= 0 &&
2655 !test_bit(Journal
, &rdev
->flags
) &&
2656 !test_bit(Replacement
, &rdev
->flags
))
2657 set_bit(WantReplacement
, &rdev
->flags
);
2658 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2659 md_wakeup_thread(rdev
->mddev
->thread
);
2661 } else if (cmd_match(buf
, "-want_replacement")) {
2662 /* Clearing 'want_replacement' is always allowed.
2663 * Once replacements starts it is too late though.
2666 clear_bit(WantReplacement
, &rdev
->flags
);
2667 } else if (cmd_match(buf
, "replacement")) {
2668 /* Can only set a device as a replacement when array has not
2669 * yet been started. Once running, replacement is automatic
2670 * from spares, or by assigning 'slot'.
2672 if (rdev
->mddev
->pers
)
2675 set_bit(Replacement
, &rdev
->flags
);
2678 } else if (cmd_match(buf
, "-replacement")) {
2679 /* Similarly, can only clear Replacement before start */
2680 if (rdev
->mddev
->pers
)
2683 clear_bit(Replacement
, &rdev
->flags
);
2686 } else if (cmd_match(buf
, "re-add")) {
2687 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2688 /* clear_bit is performed _after_ all the devices
2689 * have their local Faulty bit cleared. If any writes
2690 * happen in the meantime in the local node, they
2691 * will land in the local bitmap, which will be synced
2692 * by this node eventually
2694 if (!mddev_is_clustered(rdev
->mddev
) ||
2695 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2696 clear_bit(Faulty
, &rdev
->flags
);
2697 err
= add_bound_rdev(rdev
);
2703 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2704 return err
? err
: len
;
2706 static struct rdev_sysfs_entry rdev_state
=
2707 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2710 errors_show(struct md_rdev
*rdev
, char *page
)
2712 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2716 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2721 rv
= kstrtouint(buf
, 10, &n
);
2724 atomic_set(&rdev
->corrected_errors
, n
);
2727 static struct rdev_sysfs_entry rdev_errors
=
2728 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2731 slot_show(struct md_rdev
*rdev
, char *page
)
2733 if (test_bit(Journal
, &rdev
->flags
))
2734 return sprintf(page
, "journal\n");
2735 else if (rdev
->raid_disk
< 0)
2736 return sprintf(page
, "none\n");
2738 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2742 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2747 if (test_bit(Journal
, &rdev
->flags
))
2749 if (strncmp(buf
, "none", 4)==0)
2752 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2756 if (rdev
->mddev
->pers
&& slot
== -1) {
2757 /* Setting 'slot' on an active array requires also
2758 * updating the 'rd%d' link, and communicating
2759 * with the personality with ->hot_*_disk.
2760 * For now we only support removing
2761 * failed/spare devices. This normally happens automatically,
2762 * but not when the metadata is externally managed.
2764 if (rdev
->raid_disk
== -1)
2766 /* personality does all needed checks */
2767 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2769 clear_bit(Blocked
, &rdev
->flags
);
2770 remove_and_add_spares(rdev
->mddev
, rdev
);
2771 if (rdev
->raid_disk
>= 0)
2773 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2774 md_wakeup_thread(rdev
->mddev
->thread
);
2775 } else if (rdev
->mddev
->pers
) {
2776 /* Activating a spare .. or possibly reactivating
2777 * if we ever get bitmaps working here.
2781 if (rdev
->raid_disk
!= -1)
2784 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2787 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2790 if (slot
>= rdev
->mddev
->raid_disks
&&
2791 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2794 rdev
->raid_disk
= slot
;
2795 if (test_bit(In_sync
, &rdev
->flags
))
2796 rdev
->saved_raid_disk
= slot
;
2798 rdev
->saved_raid_disk
= -1;
2799 clear_bit(In_sync
, &rdev
->flags
);
2800 clear_bit(Bitmap_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
);
2825 static struct rdev_sysfs_entry rdev_slot
=
2826 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2829 offset_show(struct md_rdev
*rdev
, char *page
)
2831 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2835 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2837 unsigned long long offset
;
2838 if (kstrtoull(buf
, 10, &offset
) < 0)
2840 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2842 if (rdev
->sectors
&& rdev
->mddev
->external
)
2843 /* Must set offset before size, so overlap checks
2846 rdev
->data_offset
= offset
;
2847 rdev
->new_data_offset
= offset
;
2851 static struct rdev_sysfs_entry rdev_offset
=
2852 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2854 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2856 return sprintf(page
, "%llu\n",
2857 (unsigned long long)rdev
->new_data_offset
);
2860 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2861 const char *buf
, size_t len
)
2863 unsigned long long new_offset
;
2864 struct mddev
*mddev
= rdev
->mddev
;
2866 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2869 if (mddev
->sync_thread
||
2870 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
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 (test_bit(Journal
, &rdev
->flags
))
2956 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2958 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2959 return -EINVAL
; /* too confusing */
2960 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2961 if (my_mddev
->persistent
) {
2962 sectors
= super_types
[my_mddev
->major_version
].
2963 rdev_size_change(rdev
, sectors
);
2966 } else if (!sectors
)
2967 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2969 if (!my_mddev
->pers
->resize
)
2970 /* Cannot change size for RAID0 or Linear etc */
2973 if (sectors
< my_mddev
->dev_sectors
)
2974 return -EINVAL
; /* component must fit device */
2976 rdev
->sectors
= sectors
;
2977 if (sectors
> oldsectors
&& my_mddev
->external
) {
2978 /* Need to check that all other rdevs with the same
2979 * ->bdev do not overlap. 'rcu' is sufficient to walk
2980 * the rdev lists safely.
2981 * This check does not provide a hard guarantee, it
2982 * just helps avoid dangerous mistakes.
2984 struct mddev
*mddev
;
2986 struct list_head
*tmp
;
2989 for_each_mddev(mddev
, tmp
) {
2990 struct md_rdev
*rdev2
;
2992 rdev_for_each(rdev2
, mddev
)
2993 if (rdev
->bdev
== rdev2
->bdev
&&
2995 overlaps(rdev
->data_offset
, rdev
->sectors
,
3008 /* Someone else could have slipped in a size
3009 * change here, but doing so is just silly.
3010 * We put oldsectors back because we *know* it is
3011 * safe, and trust userspace not to race with
3014 rdev
->sectors
= oldsectors
;
3021 static struct rdev_sysfs_entry rdev_size
=
3022 __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
);
3059 /* sysfs access to bad-blocks list.
3060 * We present two files.
3061 * 'bad-blocks' lists sector numbers and lengths of ranges that
3062 * are recorded as bad. The list is truncated to fit within
3063 * the one-page limit of sysfs.
3064 * Writing "sector length" to this file adds an acknowledged
3066 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3067 * been acknowledged. Writing to this file adds bad blocks
3068 * without acknowledging them. This is largely for testing.
3070 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3072 return badblocks_show(&rdev
->badblocks
, page
, 0);
3074 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3076 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3077 /* Maybe that ack was all we needed */
3078 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3079 wake_up(&rdev
->blocked_wait
);
3082 static struct rdev_sysfs_entry rdev_bad_blocks
=
3083 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3085 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3087 return badblocks_show(&rdev
->badblocks
, page
, 1);
3089 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3091 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3093 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3094 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3096 static struct attribute
*rdev_default_attrs
[] = {
3101 &rdev_new_offset
.attr
,
3103 &rdev_recovery_start
.attr
,
3104 &rdev_bad_blocks
.attr
,
3105 &rdev_unack_bad_blocks
.attr
,
3109 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3111 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3112 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3118 return entry
->show(rdev
, page
);
3122 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3123 const char *page
, size_t length
)
3125 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3126 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3128 struct mddev
*mddev
= rdev
->mddev
;
3132 if (!capable(CAP_SYS_ADMIN
))
3134 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3136 if (rdev
->mddev
== NULL
)
3139 rv
= entry
->store(rdev
, page
, length
);
3140 mddev_unlock(mddev
);
3145 static void rdev_free(struct kobject
*ko
)
3147 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3150 static const struct sysfs_ops rdev_sysfs_ops
= {
3151 .show
= rdev_attr_show
,
3152 .store
= rdev_attr_store
,
3154 static struct kobj_type rdev_ktype
= {
3155 .release
= rdev_free
,
3156 .sysfs_ops
= &rdev_sysfs_ops
,
3157 .default_attrs
= rdev_default_attrs
,
3160 int md_rdev_init(struct md_rdev
*rdev
)
3163 rdev
->saved_raid_disk
= -1;
3164 rdev
->raid_disk
= -1;
3166 rdev
->data_offset
= 0;
3167 rdev
->new_data_offset
= 0;
3168 rdev
->sb_events
= 0;
3169 rdev
->last_read_error
.tv_sec
= 0;
3170 rdev
->last_read_error
.tv_nsec
= 0;
3171 rdev
->sb_loaded
= 0;
3172 rdev
->bb_page
= NULL
;
3173 atomic_set(&rdev
->nr_pending
, 0);
3174 atomic_set(&rdev
->read_errors
, 0);
3175 atomic_set(&rdev
->corrected_errors
, 0);
3177 INIT_LIST_HEAD(&rdev
->same_set
);
3178 init_waitqueue_head(&rdev
->blocked_wait
);
3180 /* Add space to store bad block list.
3181 * This reserves the space even on arrays where it cannot
3182 * be used - I wonder if that matters
3184 return badblocks_init(&rdev
->badblocks
, 0);
3186 EXPORT_SYMBOL_GPL(md_rdev_init
);
3188 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3190 * mark the device faulty if:
3192 * - the device is nonexistent (zero size)
3193 * - the device has no valid superblock
3195 * a faulty rdev _never_ has rdev->sb set.
3197 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3199 char b
[BDEVNAME_SIZE
];
3201 struct md_rdev
*rdev
;
3204 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3206 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3207 return ERR_PTR(-ENOMEM
);
3210 err
= md_rdev_init(rdev
);
3213 err
= alloc_disk_sb(rdev
);
3217 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3221 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3223 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3226 "md: %s has zero or unknown size, marking faulty!\n",
3227 bdevname(rdev
->bdev
,b
));
3232 if (super_format
>= 0) {
3233 err
= super_types
[super_format
].
3234 load_super(rdev
, NULL
, super_minor
);
3235 if (err
== -EINVAL
) {
3237 "md: %s does not have a valid v%d.%d "
3238 "superblock, not importing!\n",
3239 bdevname(rdev
->bdev
,b
),
3240 super_format
, super_minor
);
3245 "md: could not read %s's sb, not importing!\n",
3246 bdevname(rdev
->bdev
,b
));
3256 md_rdev_clear(rdev
);
3258 return ERR_PTR(err
);
3262 * Check a full RAID array for plausibility
3265 static void analyze_sbs(struct mddev
*mddev
)
3268 struct md_rdev
*rdev
, *freshest
, *tmp
;
3269 char b
[BDEVNAME_SIZE
];
3272 rdev_for_each_safe(rdev
, tmp
, mddev
)
3273 switch (super_types
[mddev
->major_version
].
3274 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3282 "md: fatal superblock inconsistency in %s"
3283 " -- removing from array\n",
3284 bdevname(rdev
->bdev
,b
));
3285 md_kick_rdev_from_array(rdev
);
3288 super_types
[mddev
->major_version
].
3289 validate_super(mddev
, freshest
);
3292 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3293 if (mddev
->max_disks
&&
3294 (rdev
->desc_nr
>= mddev
->max_disks
||
3295 i
> mddev
->max_disks
)) {
3297 "md: %s: %s: only %d devices permitted\n",
3298 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3300 md_kick_rdev_from_array(rdev
);
3303 if (rdev
!= freshest
) {
3304 if (super_types
[mddev
->major_version
].
3305 validate_super(mddev
, rdev
)) {
3306 printk(KERN_WARNING
"md: kicking non-fresh %s"
3308 bdevname(rdev
->bdev
,b
));
3309 md_kick_rdev_from_array(rdev
);
3313 if (mddev
->level
== LEVEL_MULTIPATH
) {
3314 rdev
->desc_nr
= i
++;
3315 rdev
->raid_disk
= rdev
->desc_nr
;
3316 set_bit(In_sync
, &rdev
->flags
);
3317 } else if (rdev
->raid_disk
>=
3318 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3319 !test_bit(Journal
, &rdev
->flags
)) {
3320 rdev
->raid_disk
= -1;
3321 clear_bit(In_sync
, &rdev
->flags
);
3326 /* Read a fixed-point number.
3327 * Numbers in sysfs attributes should be in "standard" units where
3328 * possible, so time should be in seconds.
3329 * However we internally use a a much smaller unit such as
3330 * milliseconds or jiffies.
3331 * This function takes a decimal number with a possible fractional
3332 * component, and produces an integer which is the result of
3333 * multiplying that number by 10^'scale'.
3334 * all without any floating-point arithmetic.
3336 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3338 unsigned long result
= 0;
3340 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3343 else if (decimals
< scale
) {
3346 result
= result
* 10 + value
;
3358 while (decimals
< scale
) {
3367 safe_delay_show(struct mddev
*mddev
, char *page
)
3369 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3370 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3373 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3377 if (mddev_is_clustered(mddev
)) {
3378 pr_info("md: Safemode is disabled for clustered mode\n");
3382 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3385 mddev
->safemode_delay
= 0;
3387 unsigned long old_delay
= mddev
->safemode_delay
;
3388 unsigned long new_delay
= (msec
*HZ
)/1000;
3392 mddev
->safemode_delay
= new_delay
;
3393 if (new_delay
< old_delay
|| old_delay
== 0)
3394 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3398 static struct md_sysfs_entry md_safe_delay
=
3399 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3402 level_show(struct mddev
*mddev
, char *page
)
3404 struct md_personality
*p
;
3406 spin_lock(&mddev
->lock
);
3409 ret
= sprintf(page
, "%s\n", p
->name
);
3410 else if (mddev
->clevel
[0])
3411 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3412 else if (mddev
->level
!= LEVEL_NONE
)
3413 ret
= sprintf(page
, "%d\n", mddev
->level
);
3416 spin_unlock(&mddev
->lock
);
3421 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3426 struct md_personality
*pers
, *oldpers
;
3428 void *priv
, *oldpriv
;
3429 struct md_rdev
*rdev
;
3431 if (slen
== 0 || slen
>= sizeof(clevel
))
3434 rv
= mddev_lock(mddev
);
3438 if (mddev
->pers
== NULL
) {
3439 strncpy(mddev
->clevel
, buf
, slen
);
3440 if (mddev
->clevel
[slen
-1] == '\n')
3442 mddev
->clevel
[slen
] = 0;
3443 mddev
->level
= LEVEL_NONE
;
3451 /* request to change the personality. Need to ensure:
3452 * - array is not engaged in resync/recovery/reshape
3453 * - old personality can be suspended
3454 * - new personality will access other array.
3458 if (mddev
->sync_thread
||
3459 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3460 mddev
->reshape_position
!= MaxSector
||
3461 mddev
->sysfs_active
)
3465 if (!mddev
->pers
->quiesce
) {
3466 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3467 mdname(mddev
), mddev
->pers
->name
);
3471 /* Now find the new personality */
3472 strncpy(clevel
, buf
, slen
);
3473 if (clevel
[slen
-1] == '\n')
3476 if (kstrtol(clevel
, 10, &level
))
3479 if (request_module("md-%s", clevel
) != 0)
3480 request_module("md-level-%s", clevel
);
3481 spin_lock(&pers_lock
);
3482 pers
= find_pers(level
, clevel
);
3483 if (!pers
|| !try_module_get(pers
->owner
)) {
3484 spin_unlock(&pers_lock
);
3485 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3489 spin_unlock(&pers_lock
);
3491 if (pers
== mddev
->pers
) {
3492 /* Nothing to do! */
3493 module_put(pers
->owner
);
3497 if (!pers
->takeover
) {
3498 module_put(pers
->owner
);
3499 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3500 mdname(mddev
), clevel
);
3505 rdev_for_each(rdev
, mddev
)
3506 rdev
->new_raid_disk
= rdev
->raid_disk
;
3508 /* ->takeover must set new_* and/or delta_disks
3509 * if it succeeds, and may set them when it fails.
3511 priv
= pers
->takeover(mddev
);
3513 mddev
->new_level
= mddev
->level
;
3514 mddev
->new_layout
= mddev
->layout
;
3515 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3516 mddev
->raid_disks
-= mddev
->delta_disks
;
3517 mddev
->delta_disks
= 0;
3518 mddev
->reshape_backwards
= 0;
3519 module_put(pers
->owner
);
3520 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3521 mdname(mddev
), clevel
);
3526 /* Looks like we have a winner */
3527 mddev_suspend(mddev
);
3528 mddev_detach(mddev
);
3530 spin_lock(&mddev
->lock
);
3531 oldpers
= mddev
->pers
;
3532 oldpriv
= mddev
->private;
3534 mddev
->private = priv
;
3535 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3536 mddev
->level
= mddev
->new_level
;
3537 mddev
->layout
= mddev
->new_layout
;
3538 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3539 mddev
->delta_disks
= 0;
3540 mddev
->reshape_backwards
= 0;
3541 mddev
->degraded
= 0;
3542 spin_unlock(&mddev
->lock
);
3544 if (oldpers
->sync_request
== NULL
&&
3546 /* We are converting from a no-redundancy array
3547 * to a redundancy array and metadata is managed
3548 * externally so we need to be sure that writes
3549 * won't block due to a need to transition
3551 * until external management is started.
3554 mddev
->safemode_delay
= 0;
3555 mddev
->safemode
= 0;
3558 oldpers
->free(mddev
, oldpriv
);
3560 if (oldpers
->sync_request
== NULL
&&
3561 pers
->sync_request
!= NULL
) {
3562 /* need to add the md_redundancy_group */
3563 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3565 "md: cannot register extra attributes for %s\n",
3567 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3569 if (oldpers
->sync_request
!= NULL
&&
3570 pers
->sync_request
== NULL
) {
3571 /* need to remove the md_redundancy_group */
3572 if (mddev
->to_remove
== NULL
)
3573 mddev
->to_remove
= &md_redundancy_group
;
3576 rdev_for_each(rdev
, mddev
) {
3577 if (rdev
->raid_disk
< 0)
3579 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3580 rdev
->new_raid_disk
= -1;
3581 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3583 sysfs_unlink_rdev(mddev
, rdev
);
3585 rdev_for_each(rdev
, mddev
) {
3586 if (rdev
->raid_disk
< 0)
3588 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3590 rdev
->raid_disk
= rdev
->new_raid_disk
;
3591 if (rdev
->raid_disk
< 0)
3592 clear_bit(In_sync
, &rdev
->flags
);
3594 if (sysfs_link_rdev(mddev
, rdev
))
3595 printk(KERN_WARNING
"md: cannot register rd%d"
3596 " for %s after level change\n",
3597 rdev
->raid_disk
, mdname(mddev
));
3601 if (pers
->sync_request
== NULL
) {
3602 /* this is now an array without redundancy, so
3603 * it must always be in_sync
3606 del_timer_sync(&mddev
->safemode_timer
);
3608 blk_set_stacking_limits(&mddev
->queue
->limits
);
3610 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3611 mddev_resume(mddev
);
3613 md_update_sb(mddev
, 1);
3614 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3615 md_new_event(mddev
);
3618 mddev_unlock(mddev
);
3622 static struct md_sysfs_entry md_level
=
3623 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3626 layout_show(struct mddev
*mddev
, char *page
)
3628 /* just a number, not meaningful for all levels */
3629 if (mddev
->reshape_position
!= MaxSector
&&
3630 mddev
->layout
!= mddev
->new_layout
)
3631 return sprintf(page
, "%d (%d)\n",
3632 mddev
->new_layout
, mddev
->layout
);
3633 return sprintf(page
, "%d\n", mddev
->layout
);
3637 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3642 err
= kstrtouint(buf
, 10, &n
);
3645 err
= mddev_lock(mddev
);
3650 if (mddev
->pers
->check_reshape
== NULL
)
3655 mddev
->new_layout
= n
;
3656 err
= mddev
->pers
->check_reshape(mddev
);
3658 mddev
->new_layout
= mddev
->layout
;
3661 mddev
->new_layout
= n
;
3662 if (mddev
->reshape_position
== MaxSector
)
3665 mddev_unlock(mddev
);
3668 static struct md_sysfs_entry md_layout
=
3669 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3672 raid_disks_show(struct mddev
*mddev
, char *page
)
3674 if (mddev
->raid_disks
== 0)
3676 if (mddev
->reshape_position
!= MaxSector
&&
3677 mddev
->delta_disks
!= 0)
3678 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3679 mddev
->raid_disks
- mddev
->delta_disks
);
3680 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3683 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3686 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3691 err
= kstrtouint(buf
, 10, &n
);
3695 err
= mddev_lock(mddev
);
3699 err
= update_raid_disks(mddev
, n
);
3700 else if (mddev
->reshape_position
!= MaxSector
) {
3701 struct md_rdev
*rdev
;
3702 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3705 rdev_for_each(rdev
, mddev
) {
3707 rdev
->data_offset
< rdev
->new_data_offset
)
3710 rdev
->data_offset
> rdev
->new_data_offset
)
3714 mddev
->delta_disks
= n
- olddisks
;
3715 mddev
->raid_disks
= n
;
3716 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3718 mddev
->raid_disks
= n
;
3720 mddev_unlock(mddev
);
3721 return err
? err
: len
;
3723 static struct md_sysfs_entry md_raid_disks
=
3724 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3727 chunk_size_show(struct mddev
*mddev
, char *page
)
3729 if (mddev
->reshape_position
!= MaxSector
&&
3730 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3731 return sprintf(page
, "%d (%d)\n",
3732 mddev
->new_chunk_sectors
<< 9,
3733 mddev
->chunk_sectors
<< 9);
3734 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3738 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3743 err
= kstrtoul(buf
, 10, &n
);
3747 err
= mddev_lock(mddev
);
3751 if (mddev
->pers
->check_reshape
== NULL
)
3756 mddev
->new_chunk_sectors
= n
>> 9;
3757 err
= mddev
->pers
->check_reshape(mddev
);
3759 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3762 mddev
->new_chunk_sectors
= n
>> 9;
3763 if (mddev
->reshape_position
== MaxSector
)
3764 mddev
->chunk_sectors
= n
>> 9;
3766 mddev_unlock(mddev
);
3769 static struct md_sysfs_entry md_chunk_size
=
3770 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3773 resync_start_show(struct mddev
*mddev
, char *page
)
3775 if (mddev
->recovery_cp
== MaxSector
)
3776 return sprintf(page
, "none\n");
3777 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3781 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3783 unsigned long long n
;
3786 if (cmd_match(buf
, "none"))
3789 err
= kstrtoull(buf
, 10, &n
);
3792 if (n
!= (sector_t
)n
)
3796 err
= mddev_lock(mddev
);
3799 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3803 mddev
->recovery_cp
= n
;
3805 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3807 mddev_unlock(mddev
);
3810 static struct md_sysfs_entry md_resync_start
=
3811 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3812 resync_start_show
, resync_start_store
);
3815 * The array state can be:
3818 * No devices, no size, no level
3819 * Equivalent to STOP_ARRAY ioctl
3821 * May have some settings, but array is not active
3822 * all IO results in error
3823 * When written, doesn't tear down array, but just stops it
3824 * suspended (not supported yet)
3825 * All IO requests will block. The array can be reconfigured.
3826 * Writing this, if accepted, will block until array is quiescent
3828 * no resync can happen. no superblocks get written.
3829 * write requests fail
3831 * like readonly, but behaves like 'clean' on a write request.
3833 * clean - no pending writes, but otherwise active.
3834 * When written to inactive array, starts without resync
3835 * If a write request arrives then
3836 * if metadata is known, mark 'dirty' and switch to 'active'.
3837 * if not known, block and switch to write-pending
3838 * If written to an active array that has pending writes, then fails.
3840 * fully active: IO and resync can be happening.
3841 * When written to inactive array, starts with resync
3844 * clean, but writes are blocked waiting for 'active' to be written.
3847 * like active, but no writes have been seen for a while (100msec).
3850 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3851 write_pending
, active_idle
, bad_word
};
3852 static char *array_states
[] = {
3853 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3854 "write-pending", "active-idle", NULL
};
3856 static int match_word(const char *word
, char **list
)
3859 for (n
=0; list
[n
]; n
++)
3860 if (cmd_match(word
, list
[n
]))
3866 array_state_show(struct mddev
*mddev
, char *page
)
3868 enum array_state st
= inactive
;
3881 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3883 else if (mddev
->safemode
)
3889 if (list_empty(&mddev
->disks
) &&
3890 mddev
->raid_disks
== 0 &&
3891 mddev
->dev_sectors
== 0)
3896 return sprintf(page
, "%s\n", array_states
[st
]);
3899 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3900 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3901 static int do_md_run(struct mddev
*mddev
);
3902 static int restart_array(struct mddev
*mddev
);
3905 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3908 enum array_state st
= match_word(buf
, array_states
);
3910 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3911 /* don't take reconfig_mutex when toggling between
3914 spin_lock(&mddev
->lock
);
3916 restart_array(mddev
);
3917 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3918 wake_up(&mddev
->sb_wait
);
3920 } else /* st == clean */ {
3921 restart_array(mddev
);
3922 if (atomic_read(&mddev
->writes_pending
) == 0) {
3923 if (mddev
->in_sync
== 0) {
3925 if (mddev
->safemode
== 1)
3926 mddev
->safemode
= 0;
3927 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3933 spin_unlock(&mddev
->lock
);
3936 err
= mddev_lock(mddev
);
3944 /* stopping an active array */
3945 err
= do_md_stop(mddev
, 0, NULL
);
3948 /* stopping an active array */
3950 err
= do_md_stop(mddev
, 2, NULL
);
3952 err
= 0; /* already inactive */
3955 break; /* not supported yet */
3958 err
= md_set_readonly(mddev
, NULL
);
3961 set_disk_ro(mddev
->gendisk
, 1);
3962 err
= do_md_run(mddev
);
3968 err
= md_set_readonly(mddev
, NULL
);
3969 else if (mddev
->ro
== 1)
3970 err
= restart_array(mddev
);
3973 set_disk_ro(mddev
->gendisk
, 0);
3977 err
= do_md_run(mddev
);
3982 err
= restart_array(mddev
);
3985 spin_lock(&mddev
->lock
);
3986 if (atomic_read(&mddev
->writes_pending
) == 0) {
3987 if (mddev
->in_sync
== 0) {
3989 if (mddev
->safemode
== 1)
3990 mddev
->safemode
= 0;
3991 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3996 spin_unlock(&mddev
->lock
);
4002 err
= restart_array(mddev
);
4005 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
4006 wake_up(&mddev
->sb_wait
);
4010 set_disk_ro(mddev
->gendisk
, 0);
4011 err
= do_md_run(mddev
);
4016 /* these cannot be set */
4021 if (mddev
->hold_active
== UNTIL_IOCTL
)
4022 mddev
->hold_active
= 0;
4023 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4025 mddev_unlock(mddev
);
4028 static struct md_sysfs_entry md_array_state
=
4029 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4032 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4033 return sprintf(page
, "%d\n",
4034 atomic_read(&mddev
->max_corr_read_errors
));
4038 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4043 rv
= kstrtouint(buf
, 10, &n
);
4046 atomic_set(&mddev
->max_corr_read_errors
, n
);
4050 static struct md_sysfs_entry max_corr_read_errors
=
4051 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4052 max_corrected_read_errors_store
);
4055 null_show(struct mddev
*mddev
, char *page
)
4061 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4063 /* buf must be %d:%d\n? giving major and minor numbers */
4064 /* The new device is added to the array.
4065 * If the array has a persistent superblock, we read the
4066 * superblock to initialise info and check validity.
4067 * Otherwise, only checking done is that in bind_rdev_to_array,
4068 * which mainly checks size.
4071 int major
= simple_strtoul(buf
, &e
, 10);
4074 struct md_rdev
*rdev
;
4077 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4079 minor
= simple_strtoul(e
+1, &e
, 10);
4080 if (*e
&& *e
!= '\n')
4082 dev
= MKDEV(major
, minor
);
4083 if (major
!= MAJOR(dev
) ||
4084 minor
!= MINOR(dev
))
4087 flush_workqueue(md_misc_wq
);
4089 err
= mddev_lock(mddev
);
4092 if (mddev
->persistent
) {
4093 rdev
= md_import_device(dev
, mddev
->major_version
,
4094 mddev
->minor_version
);
4095 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4096 struct md_rdev
*rdev0
4097 = list_entry(mddev
->disks
.next
,
4098 struct md_rdev
, same_set
);
4099 err
= super_types
[mddev
->major_version
]
4100 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4104 } else if (mddev
->external
)
4105 rdev
= md_import_device(dev
, -2, -1);
4107 rdev
= md_import_device(dev
, -1, -1);
4110 mddev_unlock(mddev
);
4111 return PTR_ERR(rdev
);
4113 err
= bind_rdev_to_array(rdev
, mddev
);
4117 mddev_unlock(mddev
);
4118 return err
? err
: len
;
4121 static struct md_sysfs_entry md_new_device
=
4122 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4125 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4128 unsigned long chunk
, end_chunk
;
4131 err
= mddev_lock(mddev
);
4136 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4138 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4139 if (buf
== end
) break;
4140 if (*end
== '-') { /* range */
4142 end_chunk
= simple_strtoul(buf
, &end
, 0);
4143 if (buf
== end
) break;
4145 if (*end
&& !isspace(*end
)) break;
4146 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4147 buf
= skip_spaces(end
);
4149 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4151 mddev_unlock(mddev
);
4155 static struct md_sysfs_entry md_bitmap
=
4156 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4159 size_show(struct mddev
*mddev
, char *page
)
4161 return sprintf(page
, "%llu\n",
4162 (unsigned long long)mddev
->dev_sectors
/ 2);
4165 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4168 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4170 /* If array is inactive, we can reduce the component size, but
4171 * not increase it (except from 0).
4172 * If array is active, we can try an on-line resize
4175 int err
= strict_blocks_to_sectors(buf
, §ors
);
4179 err
= mddev_lock(mddev
);
4183 err
= update_size(mddev
, sectors
);
4184 md_update_sb(mddev
, 1);
4186 if (mddev
->dev_sectors
== 0 ||
4187 mddev
->dev_sectors
> sectors
)
4188 mddev
->dev_sectors
= sectors
;
4192 mddev_unlock(mddev
);
4193 return err
? err
: len
;
4196 static struct md_sysfs_entry md_size
=
4197 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4199 /* Metadata version.
4201 * 'none' for arrays with no metadata (good luck...)
4202 * 'external' for arrays with externally managed metadata,
4203 * or N.M for internally known formats
4206 metadata_show(struct mddev
*mddev
, char *page
)
4208 if (mddev
->persistent
)
4209 return sprintf(page
, "%d.%d\n",
4210 mddev
->major_version
, mddev
->minor_version
);
4211 else if (mddev
->external
)
4212 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4214 return sprintf(page
, "none\n");
4218 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4223 /* Changing the details of 'external' metadata is
4224 * always permitted. Otherwise there must be
4225 * no devices attached to the array.
4228 err
= mddev_lock(mddev
);
4232 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4234 else if (!list_empty(&mddev
->disks
))
4238 if (cmd_match(buf
, "none")) {
4239 mddev
->persistent
= 0;
4240 mddev
->external
= 0;
4241 mddev
->major_version
= 0;
4242 mddev
->minor_version
= 90;
4245 if (strncmp(buf
, "external:", 9) == 0) {
4246 size_t namelen
= len
-9;
4247 if (namelen
>= sizeof(mddev
->metadata_type
))
4248 namelen
= sizeof(mddev
->metadata_type
)-1;
4249 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4250 mddev
->metadata_type
[namelen
] = 0;
4251 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4252 mddev
->metadata_type
[--namelen
] = 0;
4253 mddev
->persistent
= 0;
4254 mddev
->external
= 1;
4255 mddev
->major_version
= 0;
4256 mddev
->minor_version
= 90;
4259 major
= simple_strtoul(buf
, &e
, 10);
4261 if (e
==buf
|| *e
!= '.')
4264 minor
= simple_strtoul(buf
, &e
, 10);
4265 if (e
==buf
|| (*e
&& *e
!= '\n') )
4268 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4270 mddev
->major_version
= major
;
4271 mddev
->minor_version
= minor
;
4272 mddev
->persistent
= 1;
4273 mddev
->external
= 0;
4276 mddev_unlock(mddev
);
4280 static struct md_sysfs_entry md_metadata
=
4281 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4284 action_show(struct mddev
*mddev
, char *page
)
4286 char *type
= "idle";
4287 unsigned long recovery
= mddev
->recovery
;
4288 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4290 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4291 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4292 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4294 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4295 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4297 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4301 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4303 else if (mddev
->reshape_position
!= MaxSector
)
4306 return sprintf(page
, "%s\n", type
);
4310 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4312 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4316 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4317 if (cmd_match(page
, "frozen"))
4318 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4320 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4321 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4322 mddev_lock(mddev
) == 0) {
4323 flush_workqueue(md_misc_wq
);
4324 if (mddev
->sync_thread
) {
4325 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4326 md_reap_sync_thread(mddev
);
4328 mddev_unlock(mddev
);
4330 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4332 else if (cmd_match(page
, "resync"))
4333 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4334 else if (cmd_match(page
, "recover")) {
4335 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4336 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4337 } else if (cmd_match(page
, "reshape")) {
4339 if (mddev
->pers
->start_reshape
== NULL
)
4341 err
= mddev_lock(mddev
);
4343 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4346 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4347 err
= mddev
->pers
->start_reshape(mddev
);
4349 mddev_unlock(mddev
);
4353 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4355 if (cmd_match(page
, "check"))
4356 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4357 else if (!cmd_match(page
, "repair"))
4359 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4360 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4361 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4363 if (mddev
->ro
== 2) {
4364 /* A write to sync_action is enough to justify
4365 * canceling read-auto mode
4368 md_wakeup_thread(mddev
->sync_thread
);
4370 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4371 md_wakeup_thread(mddev
->thread
);
4372 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4376 static struct md_sysfs_entry md_scan_mode
=
4377 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4380 last_sync_action_show(struct mddev
*mddev
, char *page
)
4382 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4385 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4388 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4390 return sprintf(page
, "%llu\n",
4391 (unsigned long long)
4392 atomic64_read(&mddev
->resync_mismatches
));
4395 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4398 sync_min_show(struct mddev
*mddev
, char *page
)
4400 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4401 mddev
->sync_speed_min
? "local": "system");
4405 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4410 if (strncmp(buf
, "system", 6)==0) {
4413 rv
= kstrtouint(buf
, 10, &min
);
4419 mddev
->sync_speed_min
= min
;
4423 static struct md_sysfs_entry md_sync_min
=
4424 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4427 sync_max_show(struct mddev
*mddev
, char *page
)
4429 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4430 mddev
->sync_speed_max
? "local": "system");
4434 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4439 if (strncmp(buf
, "system", 6)==0) {
4442 rv
= kstrtouint(buf
, 10, &max
);
4448 mddev
->sync_speed_max
= max
;
4452 static struct md_sysfs_entry md_sync_max
=
4453 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4456 degraded_show(struct mddev
*mddev
, char *page
)
4458 return sprintf(page
, "%d\n", mddev
->degraded
);
4460 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4463 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4465 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4469 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4473 if (kstrtol(buf
, 10, &n
))
4476 if (n
!= 0 && n
!= 1)
4479 mddev
->parallel_resync
= n
;
4481 if (mddev
->sync_thread
)
4482 wake_up(&resync_wait
);
4487 /* force parallel resync, even with shared block devices */
4488 static struct md_sysfs_entry md_sync_force_parallel
=
4489 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4490 sync_force_parallel_show
, sync_force_parallel_store
);
4493 sync_speed_show(struct mddev
*mddev
, char *page
)
4495 unsigned long resync
, dt
, db
;
4496 if (mddev
->curr_resync
== 0)
4497 return sprintf(page
, "none\n");
4498 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4499 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4501 db
= resync
- mddev
->resync_mark_cnt
;
4502 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4505 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4508 sync_completed_show(struct mddev
*mddev
, char *page
)
4510 unsigned long long max_sectors
, resync
;
4512 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4513 return sprintf(page
, "none\n");
4515 if (mddev
->curr_resync
== 1 ||
4516 mddev
->curr_resync
== 2)
4517 return sprintf(page
, "delayed\n");
4519 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4520 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4521 max_sectors
= mddev
->resync_max_sectors
;
4523 max_sectors
= mddev
->dev_sectors
;
4525 resync
= mddev
->curr_resync_completed
;
4526 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4529 static struct md_sysfs_entry md_sync_completed
=
4530 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4533 min_sync_show(struct mddev
*mddev
, char *page
)
4535 return sprintf(page
, "%llu\n",
4536 (unsigned long long)mddev
->resync_min
);
4539 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4541 unsigned long long min
;
4544 if (kstrtoull(buf
, 10, &min
))
4547 spin_lock(&mddev
->lock
);
4549 if (min
> mddev
->resync_max
)
4553 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4556 /* Round down to multiple of 4K for safety */
4557 mddev
->resync_min
= round_down(min
, 8);
4561 spin_unlock(&mddev
->lock
);
4565 static struct md_sysfs_entry md_min_sync
=
4566 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4569 max_sync_show(struct mddev
*mddev
, char *page
)
4571 if (mddev
->resync_max
== MaxSector
)
4572 return sprintf(page
, "max\n");
4574 return sprintf(page
, "%llu\n",
4575 (unsigned long long)mddev
->resync_max
);
4578 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4581 spin_lock(&mddev
->lock
);
4582 if (strncmp(buf
, "max", 3) == 0)
4583 mddev
->resync_max
= MaxSector
;
4585 unsigned long long max
;
4589 if (kstrtoull(buf
, 10, &max
))
4591 if (max
< mddev
->resync_min
)
4595 if (max
< mddev
->resync_max
&&
4597 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4600 /* Must be a multiple of chunk_size */
4601 chunk
= mddev
->chunk_sectors
;
4603 sector_t temp
= max
;
4606 if (sector_div(temp
, chunk
))
4609 mddev
->resync_max
= max
;
4611 wake_up(&mddev
->recovery_wait
);
4614 spin_unlock(&mddev
->lock
);
4618 static struct md_sysfs_entry md_max_sync
=
4619 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4622 suspend_lo_show(struct mddev
*mddev
, char *page
)
4624 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4628 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4630 unsigned long long old
, new;
4633 err
= kstrtoull(buf
, 10, &new);
4636 if (new != (sector_t
)new)
4639 err
= mddev_lock(mddev
);
4643 if (mddev
->pers
== NULL
||
4644 mddev
->pers
->quiesce
== NULL
)
4646 old
= mddev
->suspend_lo
;
4647 mddev
->suspend_lo
= new;
4649 /* Shrinking suspended region */
4650 mddev
->pers
->quiesce(mddev
, 2);
4652 /* Expanding suspended region - need to wait */
4653 mddev
->pers
->quiesce(mddev
, 1);
4654 mddev
->pers
->quiesce(mddev
, 0);
4658 mddev_unlock(mddev
);
4661 static struct md_sysfs_entry md_suspend_lo
=
4662 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4665 suspend_hi_show(struct mddev
*mddev
, char *page
)
4667 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4671 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4673 unsigned long long old
, new;
4676 err
= kstrtoull(buf
, 10, &new);
4679 if (new != (sector_t
)new)
4682 err
= mddev_lock(mddev
);
4686 if (mddev
->pers
== NULL
||
4687 mddev
->pers
->quiesce
== NULL
)
4689 old
= mddev
->suspend_hi
;
4690 mddev
->suspend_hi
= new;
4692 /* Shrinking suspended region */
4693 mddev
->pers
->quiesce(mddev
, 2);
4695 /* Expanding suspended region - need to wait */
4696 mddev
->pers
->quiesce(mddev
, 1);
4697 mddev
->pers
->quiesce(mddev
, 0);
4701 mddev_unlock(mddev
);
4704 static struct md_sysfs_entry md_suspend_hi
=
4705 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4708 reshape_position_show(struct mddev
*mddev
, char *page
)
4710 if (mddev
->reshape_position
!= MaxSector
)
4711 return sprintf(page
, "%llu\n",
4712 (unsigned long long)mddev
->reshape_position
);
4713 strcpy(page
, "none\n");
4718 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4720 struct md_rdev
*rdev
;
4721 unsigned long long new;
4724 err
= kstrtoull(buf
, 10, &new);
4727 if (new != (sector_t
)new)
4729 err
= mddev_lock(mddev
);
4735 mddev
->reshape_position
= new;
4736 mddev
->delta_disks
= 0;
4737 mddev
->reshape_backwards
= 0;
4738 mddev
->new_level
= mddev
->level
;
4739 mddev
->new_layout
= mddev
->layout
;
4740 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4741 rdev_for_each(rdev
, mddev
)
4742 rdev
->new_data_offset
= rdev
->data_offset
;
4745 mddev_unlock(mddev
);
4749 static struct md_sysfs_entry md_reshape_position
=
4750 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4751 reshape_position_store
);
4754 reshape_direction_show(struct mddev
*mddev
, char *page
)
4756 return sprintf(page
, "%s\n",
4757 mddev
->reshape_backwards
? "backwards" : "forwards");
4761 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4766 if (cmd_match(buf
, "forwards"))
4768 else if (cmd_match(buf
, "backwards"))
4772 if (mddev
->reshape_backwards
== backwards
)
4775 err
= mddev_lock(mddev
);
4778 /* check if we are allowed to change */
4779 if (mddev
->delta_disks
)
4781 else if (mddev
->persistent
&&
4782 mddev
->major_version
== 0)
4785 mddev
->reshape_backwards
= backwards
;
4786 mddev_unlock(mddev
);
4790 static struct md_sysfs_entry md_reshape_direction
=
4791 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4792 reshape_direction_store
);
4795 array_size_show(struct mddev
*mddev
, char *page
)
4797 if (mddev
->external_size
)
4798 return sprintf(page
, "%llu\n",
4799 (unsigned long long)mddev
->array_sectors
/2);
4801 return sprintf(page
, "default\n");
4805 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4810 err
= mddev_lock(mddev
);
4814 if (strncmp(buf
, "default", 7) == 0) {
4816 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4818 sectors
= mddev
->array_sectors
;
4820 mddev
->external_size
= 0;
4822 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4824 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4827 mddev
->external_size
= 1;
4831 mddev
->array_sectors
= sectors
;
4833 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4834 revalidate_disk(mddev
->gendisk
);
4837 mddev_unlock(mddev
);
4841 static struct md_sysfs_entry md_array_size
=
4842 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4845 static struct attribute
*md_default_attrs
[] = {
4848 &md_raid_disks
.attr
,
4849 &md_chunk_size
.attr
,
4851 &md_resync_start
.attr
,
4853 &md_new_device
.attr
,
4854 &md_safe_delay
.attr
,
4855 &md_array_state
.attr
,
4856 &md_reshape_position
.attr
,
4857 &md_reshape_direction
.attr
,
4858 &md_array_size
.attr
,
4859 &max_corr_read_errors
.attr
,
4863 static struct attribute
*md_redundancy_attrs
[] = {
4865 &md_last_scan_mode
.attr
,
4866 &md_mismatches
.attr
,
4869 &md_sync_speed
.attr
,
4870 &md_sync_force_parallel
.attr
,
4871 &md_sync_completed
.attr
,
4874 &md_suspend_lo
.attr
,
4875 &md_suspend_hi
.attr
,
4880 static struct attribute_group md_redundancy_group
= {
4882 .attrs
= md_redundancy_attrs
,
4886 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4888 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4889 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4894 spin_lock(&all_mddevs_lock
);
4895 if (list_empty(&mddev
->all_mddevs
)) {
4896 spin_unlock(&all_mddevs_lock
);
4900 spin_unlock(&all_mddevs_lock
);
4902 rv
= entry
->show(mddev
, page
);
4908 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4909 const char *page
, size_t length
)
4911 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4912 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4917 if (!capable(CAP_SYS_ADMIN
))
4919 spin_lock(&all_mddevs_lock
);
4920 if (list_empty(&mddev
->all_mddevs
)) {
4921 spin_unlock(&all_mddevs_lock
);
4925 spin_unlock(&all_mddevs_lock
);
4926 rv
= entry
->store(mddev
, page
, length
);
4931 static void md_free(struct kobject
*ko
)
4933 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4935 if (mddev
->sysfs_state
)
4936 sysfs_put(mddev
->sysfs_state
);
4939 blk_cleanup_queue(mddev
->queue
);
4940 if (mddev
->gendisk
) {
4941 del_gendisk(mddev
->gendisk
);
4942 put_disk(mddev
->gendisk
);
4948 static const struct sysfs_ops md_sysfs_ops
= {
4949 .show
= md_attr_show
,
4950 .store
= md_attr_store
,
4952 static struct kobj_type md_ktype
= {
4954 .sysfs_ops
= &md_sysfs_ops
,
4955 .default_attrs
= md_default_attrs
,
4960 static void mddev_delayed_delete(struct work_struct
*ws
)
4962 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4964 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4965 kobject_del(&mddev
->kobj
);
4966 kobject_put(&mddev
->kobj
);
4969 static int md_alloc(dev_t dev
, char *name
)
4971 static DEFINE_MUTEX(disks_mutex
);
4972 struct mddev
*mddev
= mddev_find(dev
);
4973 struct gendisk
*disk
;
4982 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4983 shift
= partitioned
? MdpMinorShift
: 0;
4984 unit
= MINOR(mddev
->unit
) >> shift
;
4986 /* wait for any previous instance of this device to be
4987 * completely removed (mddev_delayed_delete).
4989 flush_workqueue(md_misc_wq
);
4991 mutex_lock(&disks_mutex
);
4997 /* Need to ensure that 'name' is not a duplicate.
4999 struct mddev
*mddev2
;
5000 spin_lock(&all_mddevs_lock
);
5002 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5003 if (mddev2
->gendisk
&&
5004 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5005 spin_unlock(&all_mddevs_lock
);
5008 spin_unlock(&all_mddevs_lock
);
5012 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5015 mddev
->queue
->queuedata
= mddev
;
5017 blk_queue_make_request(mddev
->queue
, md_make_request
);
5018 blk_set_stacking_limits(&mddev
->queue
->limits
);
5020 disk
= alloc_disk(1 << shift
);
5022 blk_cleanup_queue(mddev
->queue
);
5023 mddev
->queue
= NULL
;
5026 disk
->major
= MAJOR(mddev
->unit
);
5027 disk
->first_minor
= unit
<< shift
;
5029 strcpy(disk
->disk_name
, name
);
5030 else if (partitioned
)
5031 sprintf(disk
->disk_name
, "md_d%d", unit
);
5033 sprintf(disk
->disk_name
, "md%d", unit
);
5034 disk
->fops
= &md_fops
;
5035 disk
->private_data
= mddev
;
5036 disk
->queue
= mddev
->queue
;
5037 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
5038 /* Allow extended partitions. This makes the
5039 * 'mdp' device redundant, but we can't really
5042 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5043 mddev
->gendisk
= disk
;
5044 /* As soon as we call add_disk(), another thread could get
5045 * through to md_open, so make sure it doesn't get too far
5047 mutex_lock(&mddev
->open_mutex
);
5050 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5051 &disk_to_dev(disk
)->kobj
, "%s", "md");
5053 /* This isn't possible, but as kobject_init_and_add is marked
5054 * __must_check, we must do something with the result
5056 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
5060 if (mddev
->kobj
.sd
&&
5061 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5062 printk(KERN_DEBUG
"pointless warning\n");
5063 mutex_unlock(&mddev
->open_mutex
);
5065 mutex_unlock(&disks_mutex
);
5066 if (!error
&& mddev
->kobj
.sd
) {
5067 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5068 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5074 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5076 md_alloc(dev
, NULL
);
5080 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5082 /* val must be "md_*" where * is not all digits.
5083 * We allocate an array with a large free minor number, and
5084 * set the name to val. val must not already be an active name.
5086 int len
= strlen(val
);
5087 char buf
[DISK_NAME_LEN
];
5089 while (len
&& val
[len
-1] == '\n')
5091 if (len
>= DISK_NAME_LEN
)
5093 strlcpy(buf
, val
, len
+1);
5094 if (strncmp(buf
, "md_", 3) != 0)
5096 return md_alloc(0, buf
);
5099 static void md_safemode_timeout(unsigned long data
)
5101 struct mddev
*mddev
= (struct mddev
*) data
;
5103 if (!atomic_read(&mddev
->writes_pending
)) {
5104 mddev
->safemode
= 1;
5105 if (mddev
->external
)
5106 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5108 md_wakeup_thread(mddev
->thread
);
5111 static int start_dirty_degraded
;
5113 int md_run(struct mddev
*mddev
)
5116 struct md_rdev
*rdev
;
5117 struct md_personality
*pers
;
5119 if (list_empty(&mddev
->disks
))
5120 /* cannot run an array with no devices.. */
5125 /* Cannot run until previous stop completes properly */
5126 if (mddev
->sysfs_active
)
5130 * Analyze all RAID superblock(s)
5132 if (!mddev
->raid_disks
) {
5133 if (!mddev
->persistent
)
5138 if (mddev
->level
!= LEVEL_NONE
)
5139 request_module("md-level-%d", mddev
->level
);
5140 else if (mddev
->clevel
[0])
5141 request_module("md-%s", mddev
->clevel
);
5144 * Drop all container device buffers, from now on
5145 * the only valid external interface is through the md
5148 rdev_for_each(rdev
, mddev
) {
5149 if (test_bit(Faulty
, &rdev
->flags
))
5151 sync_blockdev(rdev
->bdev
);
5152 invalidate_bdev(rdev
->bdev
);
5154 /* perform some consistency tests on the device.
5155 * We don't want the data to overlap the metadata,
5156 * Internal Bitmap issues have been handled elsewhere.
5158 if (rdev
->meta_bdev
) {
5159 /* Nothing to check */;
5160 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5161 if (mddev
->dev_sectors
&&
5162 rdev
->data_offset
+ mddev
->dev_sectors
5164 printk("md: %s: data overlaps metadata\n",
5169 if (rdev
->sb_start
+ rdev
->sb_size
/512
5170 > rdev
->data_offset
) {
5171 printk("md: %s: metadata overlaps data\n",
5176 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5179 if (mddev
->bio_set
== NULL
)
5180 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5182 spin_lock(&pers_lock
);
5183 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5184 if (!pers
|| !try_module_get(pers
->owner
)) {
5185 spin_unlock(&pers_lock
);
5186 if (mddev
->level
!= LEVEL_NONE
)
5187 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5190 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5194 spin_unlock(&pers_lock
);
5195 if (mddev
->level
!= pers
->level
) {
5196 mddev
->level
= pers
->level
;
5197 mddev
->new_level
= pers
->level
;
5199 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5201 if (mddev
->reshape_position
!= MaxSector
&&
5202 pers
->start_reshape
== NULL
) {
5203 /* This personality cannot handle reshaping... */
5204 module_put(pers
->owner
);
5208 if (pers
->sync_request
) {
5209 /* Warn if this is a potentially silly
5212 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5213 struct md_rdev
*rdev2
;
5216 rdev_for_each(rdev
, mddev
)
5217 rdev_for_each(rdev2
, mddev
) {
5219 rdev
->bdev
->bd_contains
==
5220 rdev2
->bdev
->bd_contains
) {
5222 "%s: WARNING: %s appears to be"
5223 " on the same physical disk as"
5226 bdevname(rdev
->bdev
,b
),
5227 bdevname(rdev2
->bdev
,b2
));
5234 "True protection against single-disk"
5235 " failure might be compromised.\n");
5238 mddev
->recovery
= 0;
5239 /* may be over-ridden by personality */
5240 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5242 mddev
->ok_start_degraded
= start_dirty_degraded
;
5244 if (start_readonly
&& mddev
->ro
== 0)
5245 mddev
->ro
= 2; /* read-only, but switch on first write */
5247 err
= pers
->run(mddev
);
5249 printk(KERN_ERR
"md: pers->run() failed ...\n");
5250 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5251 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5252 " but 'external_size' not in effect?\n", __func__
);
5254 "md: invalid array_size %llu > default size %llu\n",
5255 (unsigned long long)mddev
->array_sectors
/ 2,
5256 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5259 if (err
== 0 && pers
->sync_request
&&
5260 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5261 struct bitmap
*bitmap
;
5263 bitmap
= bitmap_create(mddev
, -1);
5264 if (IS_ERR(bitmap
)) {
5265 err
= PTR_ERR(bitmap
);
5266 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5267 mdname(mddev
), err
);
5269 mddev
->bitmap
= bitmap
;
5273 mddev_detach(mddev
);
5275 pers
->free(mddev
, mddev
->private);
5276 mddev
->private = NULL
;
5277 module_put(pers
->owner
);
5278 bitmap_destroy(mddev
);
5282 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5283 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5285 if (pers
->sync_request
) {
5286 if (mddev
->kobj
.sd
&&
5287 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5289 "md: cannot register extra attributes for %s\n",
5291 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5292 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5295 atomic_set(&mddev
->writes_pending
,0);
5296 atomic_set(&mddev
->max_corr_read_errors
,
5297 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5298 mddev
->safemode
= 0;
5299 if (mddev_is_clustered(mddev
))
5300 mddev
->safemode_delay
= 0;
5302 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5305 spin_lock(&mddev
->lock
);
5307 spin_unlock(&mddev
->lock
);
5308 rdev_for_each(rdev
, mddev
)
5309 if (rdev
->raid_disk
>= 0)
5310 if (sysfs_link_rdev(mddev
, rdev
))
5311 /* failure here is OK */;
5313 if (mddev
->degraded
&& !mddev
->ro
)
5314 /* This ensures that recovering status is reported immediately
5315 * via sysfs - until a lack of spares is confirmed.
5317 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5318 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5320 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5321 md_update_sb(mddev
, 0);
5323 md_new_event(mddev
);
5324 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5325 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5326 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5329 EXPORT_SYMBOL_GPL(md_run
);
5331 static int do_md_run(struct mddev
*mddev
)
5335 err
= md_run(mddev
);
5338 err
= bitmap_load(mddev
);
5340 bitmap_destroy(mddev
);
5344 if (mddev_is_clustered(mddev
))
5345 md_allow_write(mddev
);
5347 md_wakeup_thread(mddev
->thread
);
5348 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5350 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5351 revalidate_disk(mddev
->gendisk
);
5353 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5358 static int restart_array(struct mddev
*mddev
)
5360 struct gendisk
*disk
= mddev
->gendisk
;
5362 /* Complain if it has no devices */
5363 if (list_empty(&mddev
->disks
))
5369 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5370 struct md_rdev
*rdev
;
5371 bool has_journal
= false;
5374 rdev_for_each_rcu(rdev
, mddev
) {
5375 if (test_bit(Journal
, &rdev
->flags
) &&
5376 !test_bit(Faulty
, &rdev
->flags
)) {
5383 /* Don't restart rw with journal missing/faulty */
5388 mddev
->safemode
= 0;
5390 set_disk_ro(disk
, 0);
5391 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5393 /* Kick recovery or resync if necessary */
5394 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5395 md_wakeup_thread(mddev
->thread
);
5396 md_wakeup_thread(mddev
->sync_thread
);
5397 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5401 static void md_clean(struct mddev
*mddev
)
5403 mddev
->array_sectors
= 0;
5404 mddev
->external_size
= 0;
5405 mddev
->dev_sectors
= 0;
5406 mddev
->raid_disks
= 0;
5407 mddev
->recovery_cp
= 0;
5408 mddev
->resync_min
= 0;
5409 mddev
->resync_max
= MaxSector
;
5410 mddev
->reshape_position
= MaxSector
;
5411 mddev
->external
= 0;
5412 mddev
->persistent
= 0;
5413 mddev
->level
= LEVEL_NONE
;
5414 mddev
->clevel
[0] = 0;
5417 mddev
->metadata_type
[0] = 0;
5418 mddev
->chunk_sectors
= 0;
5419 mddev
->ctime
= mddev
->utime
= 0;
5421 mddev
->max_disks
= 0;
5423 mddev
->can_decrease_events
= 0;
5424 mddev
->delta_disks
= 0;
5425 mddev
->reshape_backwards
= 0;
5426 mddev
->new_level
= LEVEL_NONE
;
5427 mddev
->new_layout
= 0;
5428 mddev
->new_chunk_sectors
= 0;
5429 mddev
->curr_resync
= 0;
5430 atomic64_set(&mddev
->resync_mismatches
, 0);
5431 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5432 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5433 mddev
->recovery
= 0;
5436 mddev
->degraded
= 0;
5437 mddev
->safemode
= 0;
5438 mddev
->private = NULL
;
5439 mddev
->bitmap_info
.offset
= 0;
5440 mddev
->bitmap_info
.default_offset
= 0;
5441 mddev
->bitmap_info
.default_space
= 0;
5442 mddev
->bitmap_info
.chunksize
= 0;
5443 mddev
->bitmap_info
.daemon_sleep
= 0;
5444 mddev
->bitmap_info
.max_write_behind
= 0;
5447 static void __md_stop_writes(struct mddev
*mddev
)
5449 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5450 flush_workqueue(md_misc_wq
);
5451 if (mddev
->sync_thread
) {
5452 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5453 md_reap_sync_thread(mddev
);
5456 del_timer_sync(&mddev
->safemode_timer
);
5458 bitmap_flush(mddev
);
5459 md_super_wait(mddev
);
5461 if (mddev
->ro
== 0 &&
5462 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5463 (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5464 /* mark array as shutdown cleanly */
5465 if (!mddev_is_clustered(mddev
))
5467 md_update_sb(mddev
, 1);
5471 void md_stop_writes(struct mddev
*mddev
)
5473 mddev_lock_nointr(mddev
);
5474 __md_stop_writes(mddev
);
5475 mddev_unlock(mddev
);
5477 EXPORT_SYMBOL_GPL(md_stop_writes
);
5479 static void mddev_detach(struct mddev
*mddev
)
5481 struct bitmap
*bitmap
= mddev
->bitmap
;
5482 /* wait for behind writes to complete */
5483 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5484 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5486 /* need to kick something here to make sure I/O goes? */
5487 wait_event(bitmap
->behind_wait
,
5488 atomic_read(&bitmap
->behind_writes
) == 0);
5490 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5491 mddev
->pers
->quiesce(mddev
, 1);
5492 mddev
->pers
->quiesce(mddev
, 0);
5494 md_unregister_thread(&mddev
->thread
);
5496 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5499 static void __md_stop(struct mddev
*mddev
)
5501 struct md_personality
*pers
= mddev
->pers
;
5502 mddev_detach(mddev
);
5503 /* Ensure ->event_work is done */
5504 flush_workqueue(md_misc_wq
);
5505 spin_lock(&mddev
->lock
);
5507 spin_unlock(&mddev
->lock
);
5508 pers
->free(mddev
, mddev
->private);
5509 mddev
->private = NULL
;
5510 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5511 mddev
->to_remove
= &md_redundancy_group
;
5512 module_put(pers
->owner
);
5513 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5516 void md_stop(struct mddev
*mddev
)
5518 /* stop the array and free an attached data structures.
5519 * This is called from dm-raid
5522 bitmap_destroy(mddev
);
5524 bioset_free(mddev
->bio_set
);
5527 EXPORT_SYMBOL_GPL(md_stop
);
5529 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5534 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5536 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5537 md_wakeup_thread(mddev
->thread
);
5539 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5540 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5541 if (mddev
->sync_thread
)
5542 /* Thread might be blocked waiting for metadata update
5543 * which will now never happen */
5544 wake_up_process(mddev
->sync_thread
->tsk
);
5546 if (mddev
->external
&& test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
5548 mddev_unlock(mddev
);
5549 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5551 wait_event(mddev
->sb_wait
,
5552 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5553 mddev_lock_nointr(mddev
);
5555 mutex_lock(&mddev
->open_mutex
);
5556 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5557 mddev
->sync_thread
||
5558 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5559 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5560 printk("md: %s still in use.\n",mdname(mddev
));
5562 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5563 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5564 md_wakeup_thread(mddev
->thread
);
5570 __md_stop_writes(mddev
);
5576 set_disk_ro(mddev
->gendisk
, 1);
5577 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5578 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5579 md_wakeup_thread(mddev
->thread
);
5580 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5584 mutex_unlock(&mddev
->open_mutex
);
5589 * 0 - completely stop and dis-assemble array
5590 * 2 - stop but do not disassemble array
5592 static int do_md_stop(struct mddev
*mddev
, int mode
,
5593 struct block_device
*bdev
)
5595 struct gendisk
*disk
= mddev
->gendisk
;
5596 struct md_rdev
*rdev
;
5599 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5601 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5602 md_wakeup_thread(mddev
->thread
);
5604 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5605 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5606 if (mddev
->sync_thread
)
5607 /* Thread might be blocked waiting for metadata update
5608 * which will now never happen */
5609 wake_up_process(mddev
->sync_thread
->tsk
);
5611 mddev_unlock(mddev
);
5612 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5613 !test_bit(MD_RECOVERY_RUNNING
,
5614 &mddev
->recovery
)));
5615 mddev_lock_nointr(mddev
);
5617 mutex_lock(&mddev
->open_mutex
);
5618 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5619 mddev
->sysfs_active
||
5620 mddev
->sync_thread
||
5621 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5622 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5623 printk("md: %s still in use.\n",mdname(mddev
));
5624 mutex_unlock(&mddev
->open_mutex
);
5626 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5627 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5628 md_wakeup_thread(mddev
->thread
);
5634 set_disk_ro(disk
, 0);
5636 __md_stop_writes(mddev
);
5638 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5640 /* tell userspace to handle 'inactive' */
5641 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5643 rdev_for_each(rdev
, mddev
)
5644 if (rdev
->raid_disk
>= 0)
5645 sysfs_unlink_rdev(mddev
, rdev
);
5647 set_capacity(disk
, 0);
5648 mutex_unlock(&mddev
->open_mutex
);
5650 revalidate_disk(disk
);
5655 mutex_unlock(&mddev
->open_mutex
);
5657 * Free resources if final stop
5660 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5662 bitmap_destroy(mddev
);
5663 if (mddev
->bitmap_info
.file
) {
5664 struct file
*f
= mddev
->bitmap_info
.file
;
5665 spin_lock(&mddev
->lock
);
5666 mddev
->bitmap_info
.file
= NULL
;
5667 spin_unlock(&mddev
->lock
);
5670 mddev
->bitmap_info
.offset
= 0;
5672 export_array(mddev
);
5675 if (mddev
->hold_active
== UNTIL_STOP
)
5676 mddev
->hold_active
= 0;
5678 md_new_event(mddev
);
5679 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5684 static void autorun_array(struct mddev
*mddev
)
5686 struct md_rdev
*rdev
;
5689 if (list_empty(&mddev
->disks
))
5692 printk(KERN_INFO
"md: running: ");
5694 rdev_for_each(rdev
, mddev
) {
5695 char b
[BDEVNAME_SIZE
];
5696 printk("<%s>", bdevname(rdev
->bdev
,b
));
5700 err
= do_md_run(mddev
);
5702 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5703 do_md_stop(mddev
, 0, NULL
);
5708 * lets try to run arrays based on all disks that have arrived
5709 * until now. (those are in pending_raid_disks)
5711 * the method: pick the first pending disk, collect all disks with
5712 * the same UUID, remove all from the pending list and put them into
5713 * the 'same_array' list. Then order this list based on superblock
5714 * update time (freshest comes first), kick out 'old' disks and
5715 * compare superblocks. If everything's fine then run it.
5717 * If "unit" is allocated, then bump its reference count
5719 static void autorun_devices(int part
)
5721 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5722 struct mddev
*mddev
;
5723 char b
[BDEVNAME_SIZE
];
5725 printk(KERN_INFO
"md: autorun ...\n");
5726 while (!list_empty(&pending_raid_disks
)) {
5729 LIST_HEAD(candidates
);
5730 rdev0
= list_entry(pending_raid_disks
.next
,
5731 struct md_rdev
, same_set
);
5733 printk(KERN_INFO
"md: considering %s ...\n",
5734 bdevname(rdev0
->bdev
,b
));
5735 INIT_LIST_HEAD(&candidates
);
5736 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5737 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5738 printk(KERN_INFO
"md: adding %s ...\n",
5739 bdevname(rdev
->bdev
,b
));
5740 list_move(&rdev
->same_set
, &candidates
);
5743 * now we have a set of devices, with all of them having
5744 * mostly sane superblocks. It's time to allocate the
5748 dev
= MKDEV(mdp_major
,
5749 rdev0
->preferred_minor
<< MdpMinorShift
);
5750 unit
= MINOR(dev
) >> MdpMinorShift
;
5752 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5755 if (rdev0
->preferred_minor
!= unit
) {
5756 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5757 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5761 md_probe(dev
, NULL
, NULL
);
5762 mddev
= mddev_find(dev
);
5763 if (!mddev
|| !mddev
->gendisk
) {
5767 "md: cannot allocate memory for md drive.\n");
5770 if (mddev_lock(mddev
))
5771 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5773 else if (mddev
->raid_disks
|| mddev
->major_version
5774 || !list_empty(&mddev
->disks
)) {
5776 "md: %s already running, cannot run %s\n",
5777 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5778 mddev_unlock(mddev
);
5780 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5781 mddev
->persistent
= 1;
5782 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5783 list_del_init(&rdev
->same_set
);
5784 if (bind_rdev_to_array(rdev
, mddev
))
5787 autorun_array(mddev
);
5788 mddev_unlock(mddev
);
5790 /* on success, candidates will be empty, on error
5793 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5794 list_del_init(&rdev
->same_set
);
5799 printk(KERN_INFO
"md: ... autorun DONE.\n");
5801 #endif /* !MODULE */
5803 static int get_version(void __user
*arg
)
5807 ver
.major
= MD_MAJOR_VERSION
;
5808 ver
.minor
= MD_MINOR_VERSION
;
5809 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5811 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5817 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5819 mdu_array_info_t info
;
5820 int nr
,working
,insync
,failed
,spare
;
5821 struct md_rdev
*rdev
;
5823 nr
= working
= insync
= failed
= spare
= 0;
5825 rdev_for_each_rcu(rdev
, mddev
) {
5827 if (test_bit(Faulty
, &rdev
->flags
))
5831 if (test_bit(In_sync
, &rdev
->flags
))
5839 info
.major_version
= mddev
->major_version
;
5840 info
.minor_version
= mddev
->minor_version
;
5841 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5842 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
5843 info
.level
= mddev
->level
;
5844 info
.size
= mddev
->dev_sectors
/ 2;
5845 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5848 info
.raid_disks
= mddev
->raid_disks
;
5849 info
.md_minor
= mddev
->md_minor
;
5850 info
.not_persistent
= !mddev
->persistent
;
5852 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
5855 info
.state
= (1<<MD_SB_CLEAN
);
5856 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5857 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5858 if (mddev_is_clustered(mddev
))
5859 info
.state
|= (1<<MD_SB_CLUSTERED
);
5860 info
.active_disks
= insync
;
5861 info
.working_disks
= working
;
5862 info
.failed_disks
= failed
;
5863 info
.spare_disks
= spare
;
5865 info
.layout
= mddev
->layout
;
5866 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5868 if (copy_to_user(arg
, &info
, sizeof(info
)))
5874 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5876 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5880 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5885 spin_lock(&mddev
->lock
);
5886 /* bitmap enabled */
5887 if (mddev
->bitmap_info
.file
) {
5888 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5889 sizeof(file
->pathname
));
5893 memmove(file
->pathname
, ptr
,
5894 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5896 spin_unlock(&mddev
->lock
);
5899 copy_to_user(arg
, file
, sizeof(*file
)))
5906 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5908 mdu_disk_info_t info
;
5909 struct md_rdev
*rdev
;
5911 if (copy_from_user(&info
, arg
, sizeof(info
)))
5915 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5917 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5918 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5919 info
.raid_disk
= rdev
->raid_disk
;
5921 if (test_bit(Faulty
, &rdev
->flags
))
5922 info
.state
|= (1<<MD_DISK_FAULTY
);
5923 else if (test_bit(In_sync
, &rdev
->flags
)) {
5924 info
.state
|= (1<<MD_DISK_ACTIVE
);
5925 info
.state
|= (1<<MD_DISK_SYNC
);
5927 if (test_bit(Journal
, &rdev
->flags
))
5928 info
.state
|= (1<<MD_DISK_JOURNAL
);
5929 if (test_bit(WriteMostly
, &rdev
->flags
))
5930 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5932 info
.major
= info
.minor
= 0;
5933 info
.raid_disk
= -1;
5934 info
.state
= (1<<MD_DISK_REMOVED
);
5938 if (copy_to_user(arg
, &info
, sizeof(info
)))
5944 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5946 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5947 struct md_rdev
*rdev
;
5948 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5950 if (mddev_is_clustered(mddev
) &&
5951 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5952 pr_err("%s: Cannot add to clustered mddev.\n",
5957 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5960 if (!mddev
->raid_disks
) {
5962 /* expecting a device which has a superblock */
5963 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5966 "md: md_import_device returned %ld\n",
5968 return PTR_ERR(rdev
);
5970 if (!list_empty(&mddev
->disks
)) {
5971 struct md_rdev
*rdev0
5972 = list_entry(mddev
->disks
.next
,
5973 struct md_rdev
, same_set
);
5974 err
= super_types
[mddev
->major_version
]
5975 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5978 "md: %s has different UUID to %s\n",
5979 bdevname(rdev
->bdev
,b
),
5980 bdevname(rdev0
->bdev
,b2
));
5985 err
= bind_rdev_to_array(rdev
, mddev
);
5992 * add_new_disk can be used once the array is assembled
5993 * to add "hot spares". They must already have a superblock
5998 if (!mddev
->pers
->hot_add_disk
) {
6000 "%s: personality does not support diskops!\n",
6004 if (mddev
->persistent
)
6005 rdev
= md_import_device(dev
, mddev
->major_version
,
6006 mddev
->minor_version
);
6008 rdev
= md_import_device(dev
, -1, -1);
6011 "md: md_import_device returned %ld\n",
6013 return PTR_ERR(rdev
);
6015 /* set saved_raid_disk if appropriate */
6016 if (!mddev
->persistent
) {
6017 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6018 info
->raid_disk
< mddev
->raid_disks
) {
6019 rdev
->raid_disk
= info
->raid_disk
;
6020 set_bit(In_sync
, &rdev
->flags
);
6021 clear_bit(Bitmap_sync
, &rdev
->flags
);
6023 rdev
->raid_disk
= -1;
6024 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6026 super_types
[mddev
->major_version
].
6027 validate_super(mddev
, rdev
);
6028 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6029 rdev
->raid_disk
!= info
->raid_disk
) {
6030 /* This was a hot-add request, but events doesn't
6031 * match, so reject it.
6037 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6038 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6039 set_bit(WriteMostly
, &rdev
->flags
);
6041 clear_bit(WriteMostly
, &rdev
->flags
);
6043 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6044 struct md_rdev
*rdev2
;
6045 bool has_journal
= false;
6047 /* make sure no existing journal disk */
6048 rdev_for_each(rdev2
, mddev
) {
6049 if (test_bit(Journal
, &rdev2
->flags
)) {
6058 set_bit(Journal
, &rdev
->flags
);
6061 * check whether the device shows up in other nodes
6063 if (mddev_is_clustered(mddev
)) {
6064 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6065 set_bit(Candidate
, &rdev
->flags
);
6066 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6067 /* --add initiated by this node */
6068 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6076 rdev
->raid_disk
= -1;
6077 err
= bind_rdev_to_array(rdev
, mddev
);
6082 if (mddev_is_clustered(mddev
)) {
6083 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6084 md_cluster_ops
->new_disk_ack(mddev
, (err
== 0));
6087 md_cluster_ops
->add_new_disk_cancel(mddev
);
6089 err
= add_bound_rdev(rdev
);
6093 err
= add_bound_rdev(rdev
);
6098 /* otherwise, add_new_disk is only allowed
6099 * for major_version==0 superblocks
6101 if (mddev
->major_version
!= 0) {
6102 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
6107 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6109 rdev
= md_import_device(dev
, -1, 0);
6112 "md: error, md_import_device() returned %ld\n",
6114 return PTR_ERR(rdev
);
6116 rdev
->desc_nr
= info
->number
;
6117 if (info
->raid_disk
< mddev
->raid_disks
)
6118 rdev
->raid_disk
= info
->raid_disk
;
6120 rdev
->raid_disk
= -1;
6122 if (rdev
->raid_disk
< mddev
->raid_disks
)
6123 if (info
->state
& (1<<MD_DISK_SYNC
))
6124 set_bit(In_sync
, &rdev
->flags
);
6126 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6127 set_bit(WriteMostly
, &rdev
->flags
);
6129 if (!mddev
->persistent
) {
6130 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
6131 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6133 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6134 rdev
->sectors
= rdev
->sb_start
;
6136 err
= bind_rdev_to_array(rdev
, mddev
);
6146 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6148 char b
[BDEVNAME_SIZE
];
6149 struct md_rdev
*rdev
;
6151 rdev
= find_rdev(mddev
, dev
);
6155 if (rdev
->raid_disk
< 0)
6158 clear_bit(Blocked
, &rdev
->flags
);
6159 remove_and_add_spares(mddev
, rdev
);
6161 if (rdev
->raid_disk
>= 0)
6165 if (mddev_is_clustered(mddev
))
6166 md_cluster_ops
->remove_disk(mddev
, rdev
);
6168 md_kick_rdev_from_array(rdev
);
6169 md_update_sb(mddev
, 1);
6170 md_new_event(mddev
);
6174 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
6175 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6179 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6181 char b
[BDEVNAME_SIZE
];
6183 struct md_rdev
*rdev
;
6188 if (mddev
->major_version
!= 0) {
6189 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
6190 " version-0 superblocks.\n",
6194 if (!mddev
->pers
->hot_add_disk
) {
6196 "%s: personality does not support diskops!\n",
6201 rdev
= md_import_device(dev
, -1, 0);
6204 "md: error, md_import_device() returned %ld\n",
6209 if (mddev
->persistent
)
6210 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6212 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6214 rdev
->sectors
= rdev
->sb_start
;
6216 if (test_bit(Faulty
, &rdev
->flags
)) {
6218 "md: can not hot-add faulty %s disk to %s!\n",
6219 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6224 clear_bit(In_sync
, &rdev
->flags
);
6226 rdev
->saved_raid_disk
= -1;
6227 err
= bind_rdev_to_array(rdev
, mddev
);
6232 * The rest should better be atomic, we can have disk failures
6233 * noticed in interrupt contexts ...
6236 rdev
->raid_disk
= -1;
6238 md_update_sb(mddev
, 1);
6240 * Kick recovery, maybe this spare has to be added to the
6241 * array immediately.
6243 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6244 md_wakeup_thread(mddev
->thread
);
6245 md_new_event(mddev
);
6253 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6258 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6260 if (mddev
->recovery
|| mddev
->sync_thread
)
6262 /* we should be able to change the bitmap.. */
6266 struct inode
*inode
;
6269 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6270 return -EEXIST
; /* cannot add when bitmap is present */
6274 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6279 inode
= f
->f_mapping
->host
;
6280 if (!S_ISREG(inode
->i_mode
)) {
6281 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6284 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6285 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6288 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6289 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6297 mddev
->bitmap_info
.file
= f
;
6298 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6299 } else if (mddev
->bitmap
== NULL
)
6300 return -ENOENT
; /* cannot remove what isn't there */
6303 mddev
->pers
->quiesce(mddev
, 1);
6305 struct bitmap
*bitmap
;
6307 bitmap
= bitmap_create(mddev
, -1);
6308 if (!IS_ERR(bitmap
)) {
6309 mddev
->bitmap
= bitmap
;
6310 err
= bitmap_load(mddev
);
6312 err
= PTR_ERR(bitmap
);
6314 if (fd
< 0 || err
) {
6315 bitmap_destroy(mddev
);
6316 fd
= -1; /* make sure to put the file */
6318 mddev
->pers
->quiesce(mddev
, 0);
6321 struct file
*f
= mddev
->bitmap_info
.file
;
6323 spin_lock(&mddev
->lock
);
6324 mddev
->bitmap_info
.file
= NULL
;
6325 spin_unlock(&mddev
->lock
);
6334 * set_array_info is used two different ways
6335 * The original usage is when creating a new array.
6336 * In this usage, raid_disks is > 0 and it together with
6337 * level, size, not_persistent,layout,chunksize determine the
6338 * shape of the array.
6339 * This will always create an array with a type-0.90.0 superblock.
6340 * The newer usage is when assembling an array.
6341 * In this case raid_disks will be 0, and the major_version field is
6342 * use to determine which style super-blocks are to be found on the devices.
6343 * The minor and patch _version numbers are also kept incase the
6344 * super_block handler wishes to interpret them.
6346 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6349 if (info
->raid_disks
== 0) {
6350 /* just setting version number for superblock loading */
6351 if (info
->major_version
< 0 ||
6352 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6353 super_types
[info
->major_version
].name
== NULL
) {
6354 /* maybe try to auto-load a module? */
6356 "md: superblock version %d not known\n",
6357 info
->major_version
);
6360 mddev
->major_version
= info
->major_version
;
6361 mddev
->minor_version
= info
->minor_version
;
6362 mddev
->patch_version
= info
->patch_version
;
6363 mddev
->persistent
= !info
->not_persistent
;
6364 /* ensure mddev_put doesn't delete this now that there
6365 * is some minimal configuration.
6367 mddev
->ctime
= ktime_get_real_seconds();
6370 mddev
->major_version
= MD_MAJOR_VERSION
;
6371 mddev
->minor_version
= MD_MINOR_VERSION
;
6372 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6373 mddev
->ctime
= ktime_get_real_seconds();
6375 mddev
->level
= info
->level
;
6376 mddev
->clevel
[0] = 0;
6377 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6378 mddev
->raid_disks
= info
->raid_disks
;
6379 /* don't set md_minor, it is determined by which /dev/md* was
6382 if (info
->state
& (1<<MD_SB_CLEAN
))
6383 mddev
->recovery_cp
= MaxSector
;
6385 mddev
->recovery_cp
= 0;
6386 mddev
->persistent
= ! info
->not_persistent
;
6387 mddev
->external
= 0;
6389 mddev
->layout
= info
->layout
;
6390 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6392 mddev
->max_disks
= MD_SB_DISKS
;
6394 if (mddev
->persistent
)
6396 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6398 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6399 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6400 mddev
->bitmap_info
.offset
= 0;
6402 mddev
->reshape_position
= MaxSector
;
6405 * Generate a 128 bit UUID
6407 get_random_bytes(mddev
->uuid
, 16);
6409 mddev
->new_level
= mddev
->level
;
6410 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6411 mddev
->new_layout
= mddev
->layout
;
6412 mddev
->delta_disks
= 0;
6413 mddev
->reshape_backwards
= 0;
6418 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6420 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6422 if (mddev
->external_size
)
6425 mddev
->array_sectors
= array_sectors
;
6427 EXPORT_SYMBOL(md_set_array_sectors
);
6429 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6431 struct md_rdev
*rdev
;
6433 int fit
= (num_sectors
== 0);
6435 if (mddev
->pers
->resize
== NULL
)
6437 /* The "num_sectors" is the number of sectors of each device that
6438 * is used. This can only make sense for arrays with redundancy.
6439 * linear and raid0 always use whatever space is available. We can only
6440 * consider changing this number if no resync or reconstruction is
6441 * happening, and if the new size is acceptable. It must fit before the
6442 * sb_start or, if that is <data_offset, it must fit before the size
6443 * of each device. If num_sectors is zero, we find the largest size
6446 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6452 rdev_for_each(rdev
, mddev
) {
6453 sector_t avail
= rdev
->sectors
;
6455 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6456 num_sectors
= avail
;
6457 if (avail
< num_sectors
)
6460 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6462 revalidate_disk(mddev
->gendisk
);
6466 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6469 struct md_rdev
*rdev
;
6470 /* change the number of raid disks */
6471 if (mddev
->pers
->check_reshape
== NULL
)
6475 if (raid_disks
<= 0 ||
6476 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6478 if (mddev
->sync_thread
||
6479 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6480 mddev
->reshape_position
!= MaxSector
)
6483 rdev_for_each(rdev
, mddev
) {
6484 if (mddev
->raid_disks
< raid_disks
&&
6485 rdev
->data_offset
< rdev
->new_data_offset
)
6487 if (mddev
->raid_disks
> raid_disks
&&
6488 rdev
->data_offset
> rdev
->new_data_offset
)
6492 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6493 if (mddev
->delta_disks
< 0)
6494 mddev
->reshape_backwards
= 1;
6495 else if (mddev
->delta_disks
> 0)
6496 mddev
->reshape_backwards
= 0;
6498 rv
= mddev
->pers
->check_reshape(mddev
);
6500 mddev
->delta_disks
= 0;
6501 mddev
->reshape_backwards
= 0;
6507 * update_array_info is used to change the configuration of an
6509 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6510 * fields in the info are checked against the array.
6511 * Any differences that cannot be handled will cause an error.
6512 * Normally, only one change can be managed at a time.
6514 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6520 /* calculate expected state,ignoring low bits */
6521 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6522 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6524 if (mddev
->major_version
!= info
->major_version
||
6525 mddev
->minor_version
!= info
->minor_version
||
6526 /* mddev->patch_version != info->patch_version || */
6527 mddev
->ctime
!= info
->ctime
||
6528 mddev
->level
!= info
->level
||
6529 /* mddev->layout != info->layout || */
6530 mddev
->persistent
!= !info
->not_persistent
||
6531 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6532 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6533 ((state
^info
->state
) & 0xfffffe00)
6536 /* Check there is only one change */
6537 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6539 if (mddev
->raid_disks
!= info
->raid_disks
)
6541 if (mddev
->layout
!= info
->layout
)
6543 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6550 if (mddev
->layout
!= info
->layout
) {
6552 * we don't need to do anything at the md level, the
6553 * personality will take care of it all.
6555 if (mddev
->pers
->check_reshape
== NULL
)
6558 mddev
->new_layout
= info
->layout
;
6559 rv
= mddev
->pers
->check_reshape(mddev
);
6561 mddev
->new_layout
= mddev
->layout
;
6565 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6566 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6568 if (mddev
->raid_disks
!= info
->raid_disks
)
6569 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6571 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6572 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6576 if (mddev
->recovery
|| mddev
->sync_thread
) {
6580 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6581 struct bitmap
*bitmap
;
6582 /* add the bitmap */
6583 if (mddev
->bitmap
) {
6587 if (mddev
->bitmap_info
.default_offset
== 0) {
6591 mddev
->bitmap_info
.offset
=
6592 mddev
->bitmap_info
.default_offset
;
6593 mddev
->bitmap_info
.space
=
6594 mddev
->bitmap_info
.default_space
;
6595 mddev
->pers
->quiesce(mddev
, 1);
6596 bitmap
= bitmap_create(mddev
, -1);
6597 if (!IS_ERR(bitmap
)) {
6598 mddev
->bitmap
= bitmap
;
6599 rv
= bitmap_load(mddev
);
6601 rv
= PTR_ERR(bitmap
);
6603 bitmap_destroy(mddev
);
6604 mddev
->pers
->quiesce(mddev
, 0);
6606 /* remove the bitmap */
6607 if (!mddev
->bitmap
) {
6611 if (mddev
->bitmap
->storage
.file
) {
6615 if (mddev
->bitmap_info
.nodes
) {
6616 /* hold PW on all the bitmap lock */
6617 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6618 printk("md: can't change bitmap to none since the"
6619 " array is in use by more than one node\n");
6621 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6625 mddev
->bitmap_info
.nodes
= 0;
6626 md_cluster_ops
->leave(mddev
);
6628 mddev
->pers
->quiesce(mddev
, 1);
6629 bitmap_destroy(mddev
);
6630 mddev
->pers
->quiesce(mddev
, 0);
6631 mddev
->bitmap_info
.offset
= 0;
6634 md_update_sb(mddev
, 1);
6640 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6642 struct md_rdev
*rdev
;
6645 if (mddev
->pers
== NULL
)
6649 rdev
= find_rdev_rcu(mddev
, dev
);
6653 md_error(mddev
, rdev
);
6654 if (!test_bit(Faulty
, &rdev
->flags
))
6662 * We have a problem here : there is no easy way to give a CHS
6663 * virtual geometry. We currently pretend that we have a 2 heads
6664 * 4 sectors (with a BIG number of cylinders...). This drives
6665 * dosfs just mad... ;-)
6667 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6669 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6673 geo
->cylinders
= mddev
->array_sectors
/ 8;
6677 static inline bool md_ioctl_valid(unsigned int cmd
)
6682 case GET_ARRAY_INFO
:
6683 case GET_BITMAP_FILE
:
6686 case HOT_REMOVE_DISK
:
6689 case RESTART_ARRAY_RW
:
6691 case SET_ARRAY_INFO
:
6692 case SET_BITMAP_FILE
:
6693 case SET_DISK_FAULTY
:
6696 case CLUSTERED_DISK_NACK
:
6703 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6704 unsigned int cmd
, unsigned long arg
)
6707 void __user
*argp
= (void __user
*)arg
;
6708 struct mddev
*mddev
= NULL
;
6711 if (!md_ioctl_valid(cmd
))
6716 case GET_ARRAY_INFO
:
6720 if (!capable(CAP_SYS_ADMIN
))
6725 * Commands dealing with the RAID driver but not any
6730 err
= get_version(argp
);
6736 autostart_arrays(arg
);
6743 * Commands creating/starting a new array:
6746 mddev
= bdev
->bd_disk
->private_data
;
6753 /* Some actions do not requires the mutex */
6755 case GET_ARRAY_INFO
:
6756 if (!mddev
->raid_disks
&& !mddev
->external
)
6759 err
= get_array_info(mddev
, argp
);
6763 if (!mddev
->raid_disks
&& !mddev
->external
)
6766 err
= get_disk_info(mddev
, argp
);
6769 case SET_DISK_FAULTY
:
6770 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6773 case GET_BITMAP_FILE
:
6774 err
= get_bitmap_file(mddev
, argp
);
6779 if (cmd
== ADD_NEW_DISK
)
6780 /* need to ensure md_delayed_delete() has completed */
6781 flush_workqueue(md_misc_wq
);
6783 if (cmd
== HOT_REMOVE_DISK
)
6784 /* need to ensure recovery thread has run */
6785 wait_event_interruptible_timeout(mddev
->sb_wait
,
6786 !test_bit(MD_RECOVERY_NEEDED
,
6788 msecs_to_jiffies(5000));
6789 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6790 /* Need to flush page cache, and ensure no-one else opens
6793 mutex_lock(&mddev
->open_mutex
);
6794 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6795 mutex_unlock(&mddev
->open_mutex
);
6799 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6800 mutex_unlock(&mddev
->open_mutex
);
6801 sync_blockdev(bdev
);
6803 err
= mddev_lock(mddev
);
6806 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6811 if (cmd
== SET_ARRAY_INFO
) {
6812 mdu_array_info_t info
;
6814 memset(&info
, 0, sizeof(info
));
6815 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6820 err
= update_array_info(mddev
, &info
);
6822 printk(KERN_WARNING
"md: couldn't update"
6823 " array info. %d\n", err
);
6828 if (!list_empty(&mddev
->disks
)) {
6830 "md: array %s already has disks!\n",
6835 if (mddev
->raid_disks
) {
6837 "md: array %s already initialised!\n",
6842 err
= set_array_info(mddev
, &info
);
6844 printk(KERN_WARNING
"md: couldn't set"
6845 " array info. %d\n", err
);
6852 * Commands querying/configuring an existing array:
6854 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6855 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6856 if ((!mddev
->raid_disks
&& !mddev
->external
)
6857 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6858 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6859 && cmd
!= GET_BITMAP_FILE
) {
6865 * Commands even a read-only array can execute:
6868 case RESTART_ARRAY_RW
:
6869 err
= restart_array(mddev
);
6873 err
= do_md_stop(mddev
, 0, bdev
);
6877 err
= md_set_readonly(mddev
, bdev
);
6880 case HOT_REMOVE_DISK
:
6881 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6885 /* We can support ADD_NEW_DISK on read-only arrays
6886 * only if we are re-adding a preexisting device.
6887 * So require mddev->pers and MD_DISK_SYNC.
6890 mdu_disk_info_t info
;
6891 if (copy_from_user(&info
, argp
, sizeof(info
)))
6893 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6894 /* Need to clear read-only for this */
6897 err
= add_new_disk(mddev
, &info
);
6903 if (get_user(ro
, (int __user
*)(arg
))) {
6909 /* if the bdev is going readonly the value of mddev->ro
6910 * does not matter, no writes are coming
6915 /* are we are already prepared for writes? */
6919 /* transitioning to readauto need only happen for
6920 * arrays that call md_write_start
6923 err
= restart_array(mddev
);
6926 set_disk_ro(mddev
->gendisk
, 0);
6933 * The remaining ioctls are changing the state of the
6934 * superblock, so we do not allow them on read-only arrays.
6936 if (mddev
->ro
&& mddev
->pers
) {
6937 if (mddev
->ro
== 2) {
6939 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6940 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6941 /* mddev_unlock will wake thread */
6942 /* If a device failed while we were read-only, we
6943 * need to make sure the metadata is updated now.
6945 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6946 mddev_unlock(mddev
);
6947 wait_event(mddev
->sb_wait
,
6948 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6949 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6950 mddev_lock_nointr(mddev
);
6961 mdu_disk_info_t info
;
6962 if (copy_from_user(&info
, argp
, sizeof(info
)))
6965 err
= add_new_disk(mddev
, &info
);
6969 case CLUSTERED_DISK_NACK
:
6970 if (mddev_is_clustered(mddev
))
6971 md_cluster_ops
->new_disk_ack(mddev
, false);
6977 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6981 err
= do_md_run(mddev
);
6984 case SET_BITMAP_FILE
:
6985 err
= set_bitmap_file(mddev
, (int)arg
);
6994 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6996 mddev
->hold_active
= 0;
6997 mddev_unlock(mddev
);
7001 #ifdef CONFIG_COMPAT
7002 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7003 unsigned int cmd
, unsigned long arg
)
7006 case HOT_REMOVE_DISK
:
7008 case SET_DISK_FAULTY
:
7009 case SET_BITMAP_FILE
:
7010 /* These take in integer arg, do not convert */
7013 arg
= (unsigned long)compat_ptr(arg
);
7017 return md_ioctl(bdev
, mode
, cmd
, arg
);
7019 #endif /* CONFIG_COMPAT */
7021 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7024 * Succeed if we can lock the mddev, which confirms that
7025 * it isn't being stopped right now.
7027 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7033 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7034 /* we are racing with mddev_put which is discarding this
7038 /* Wait until bdev->bd_disk is definitely gone */
7039 flush_workqueue(md_misc_wq
);
7040 /* Then retry the open from the top */
7041 return -ERESTARTSYS
;
7043 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7045 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7049 atomic_inc(&mddev
->openers
);
7050 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
7051 mutex_unlock(&mddev
->open_mutex
);
7053 check_disk_change(bdev
);
7058 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7060 struct mddev
*mddev
= disk
->private_data
;
7063 atomic_dec(&mddev
->openers
);
7067 static int md_media_changed(struct gendisk
*disk
)
7069 struct mddev
*mddev
= disk
->private_data
;
7071 return mddev
->changed
;
7074 static int md_revalidate(struct gendisk
*disk
)
7076 struct mddev
*mddev
= disk
->private_data
;
7081 static const struct block_device_operations md_fops
=
7083 .owner
= THIS_MODULE
,
7085 .release
= md_release
,
7087 #ifdef CONFIG_COMPAT
7088 .compat_ioctl
= md_compat_ioctl
,
7090 .getgeo
= md_getgeo
,
7091 .media_changed
= md_media_changed
,
7092 .revalidate_disk
= md_revalidate
,
7095 static int md_thread(void *arg
)
7097 struct md_thread
*thread
= arg
;
7100 * md_thread is a 'system-thread', it's priority should be very
7101 * high. We avoid resource deadlocks individually in each
7102 * raid personality. (RAID5 does preallocation) We also use RR and
7103 * the very same RT priority as kswapd, thus we will never get
7104 * into a priority inversion deadlock.
7106 * we definitely have to have equal or higher priority than
7107 * bdflush, otherwise bdflush will deadlock if there are too
7108 * many dirty RAID5 blocks.
7111 allow_signal(SIGKILL
);
7112 while (!kthread_should_stop()) {
7114 /* We need to wait INTERRUPTIBLE so that
7115 * we don't add to the load-average.
7116 * That means we need to be sure no signals are
7119 if (signal_pending(current
))
7120 flush_signals(current
);
7122 wait_event_interruptible_timeout
7124 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7125 || kthread_should_stop(),
7128 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7129 if (!kthread_should_stop())
7130 thread
->run(thread
);
7136 void md_wakeup_thread(struct md_thread
*thread
)
7139 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7140 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7141 wake_up(&thread
->wqueue
);
7144 EXPORT_SYMBOL(md_wakeup_thread
);
7146 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7147 struct mddev
*mddev
, const char *name
)
7149 struct md_thread
*thread
;
7151 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7155 init_waitqueue_head(&thread
->wqueue
);
7158 thread
->mddev
= mddev
;
7159 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7160 thread
->tsk
= kthread_run(md_thread
, thread
,
7162 mdname(thread
->mddev
),
7164 if (IS_ERR(thread
->tsk
)) {
7170 EXPORT_SYMBOL(md_register_thread
);
7172 void md_unregister_thread(struct md_thread
**threadp
)
7174 struct md_thread
*thread
= *threadp
;
7177 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7178 /* Locking ensures that mddev_unlock does not wake_up a
7179 * non-existent thread
7181 spin_lock(&pers_lock
);
7183 spin_unlock(&pers_lock
);
7185 kthread_stop(thread
->tsk
);
7188 EXPORT_SYMBOL(md_unregister_thread
);
7190 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7192 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7195 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7197 mddev
->pers
->error_handler(mddev
,rdev
);
7198 if (mddev
->degraded
)
7199 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7200 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7201 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7202 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7203 md_wakeup_thread(mddev
->thread
);
7204 if (mddev
->event_work
.func
)
7205 queue_work(md_misc_wq
, &mddev
->event_work
);
7206 md_new_event(mddev
);
7208 EXPORT_SYMBOL(md_error
);
7210 /* seq_file implementation /proc/mdstat */
7212 static void status_unused(struct seq_file
*seq
)
7215 struct md_rdev
*rdev
;
7217 seq_printf(seq
, "unused devices: ");
7219 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7220 char b
[BDEVNAME_SIZE
];
7222 seq_printf(seq
, "%s ",
7223 bdevname(rdev
->bdev
,b
));
7226 seq_printf(seq
, "<none>");
7228 seq_printf(seq
, "\n");
7231 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7233 sector_t max_sectors
, resync
, res
;
7234 unsigned long dt
, db
;
7237 unsigned int per_milli
;
7239 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7240 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7241 max_sectors
= mddev
->resync_max_sectors
;
7243 max_sectors
= mddev
->dev_sectors
;
7245 resync
= mddev
->curr_resync
;
7247 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7248 /* Still cleaning up */
7249 resync
= max_sectors
;
7251 resync
-= atomic_read(&mddev
->recovery_active
);
7254 if (mddev
->recovery_cp
< MaxSector
) {
7255 seq_printf(seq
, "\tresync=PENDING");
7261 seq_printf(seq
, "\tresync=DELAYED");
7265 WARN_ON(max_sectors
== 0);
7266 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7267 * in a sector_t, and (max_sectors>>scale) will fit in a
7268 * u32, as those are the requirements for sector_div.
7269 * Thus 'scale' must be at least 10
7272 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7273 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7276 res
= (resync
>>scale
)*1000;
7277 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7281 int i
, x
= per_milli
/50, y
= 20-x
;
7282 seq_printf(seq
, "[");
7283 for (i
= 0; i
< x
; i
++)
7284 seq_printf(seq
, "=");
7285 seq_printf(seq
, ">");
7286 for (i
= 0; i
< y
; i
++)
7287 seq_printf(seq
, ".");
7288 seq_printf(seq
, "] ");
7290 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7291 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7293 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7295 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7296 "resync" : "recovery"))),
7297 per_milli
/10, per_milli
% 10,
7298 (unsigned long long) resync
/2,
7299 (unsigned long long) max_sectors
/2);
7302 * dt: time from mark until now
7303 * db: blocks written from mark until now
7304 * rt: remaining time
7306 * rt is a sector_t, so could be 32bit or 64bit.
7307 * So we divide before multiply in case it is 32bit and close
7309 * We scale the divisor (db) by 32 to avoid losing precision
7310 * near the end of resync when the number of remaining sectors
7312 * We then divide rt by 32 after multiplying by db to compensate.
7313 * The '+1' avoids division by zero if db is very small.
7315 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7317 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7318 - mddev
->resync_mark_cnt
;
7320 rt
= max_sectors
- resync
; /* number of remaining sectors */
7321 sector_div(rt
, db
/32+1);
7325 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7326 ((unsigned long)rt
% 60)/6);
7328 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7332 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7334 struct list_head
*tmp
;
7336 struct mddev
*mddev
;
7344 spin_lock(&all_mddevs_lock
);
7345 list_for_each(tmp
,&all_mddevs
)
7347 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7349 spin_unlock(&all_mddevs_lock
);
7352 spin_unlock(&all_mddevs_lock
);
7354 return (void*)2;/* tail */
7358 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7360 struct list_head
*tmp
;
7361 struct mddev
*next_mddev
, *mddev
= v
;
7367 spin_lock(&all_mddevs_lock
);
7369 tmp
= all_mddevs
.next
;
7371 tmp
= mddev
->all_mddevs
.next
;
7372 if (tmp
!= &all_mddevs
)
7373 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7375 next_mddev
= (void*)2;
7378 spin_unlock(&all_mddevs_lock
);
7386 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7388 struct mddev
*mddev
= v
;
7390 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7394 static int md_seq_show(struct seq_file
*seq
, void *v
)
7396 struct mddev
*mddev
= v
;
7398 struct md_rdev
*rdev
;
7400 if (v
== (void*)1) {
7401 struct md_personality
*pers
;
7402 seq_printf(seq
, "Personalities : ");
7403 spin_lock(&pers_lock
);
7404 list_for_each_entry(pers
, &pers_list
, list
)
7405 seq_printf(seq
, "[%s] ", pers
->name
);
7407 spin_unlock(&pers_lock
);
7408 seq_printf(seq
, "\n");
7409 seq
->poll_event
= atomic_read(&md_event_count
);
7412 if (v
== (void*)2) {
7417 spin_lock(&mddev
->lock
);
7418 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7419 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7420 mddev
->pers
? "" : "in");
7423 seq_printf(seq
, " (read-only)");
7425 seq_printf(seq
, " (auto-read-only)");
7426 seq_printf(seq
, " %s", mddev
->pers
->name
);
7431 rdev_for_each_rcu(rdev
, mddev
) {
7432 char b
[BDEVNAME_SIZE
];
7433 seq_printf(seq
, " %s[%d]",
7434 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7435 if (test_bit(WriteMostly
, &rdev
->flags
))
7436 seq_printf(seq
, "(W)");
7437 if (test_bit(Journal
, &rdev
->flags
))
7438 seq_printf(seq
, "(J)");
7439 if (test_bit(Faulty
, &rdev
->flags
)) {
7440 seq_printf(seq
, "(F)");
7443 if (rdev
->raid_disk
< 0)
7444 seq_printf(seq
, "(S)"); /* spare */
7445 if (test_bit(Replacement
, &rdev
->flags
))
7446 seq_printf(seq
, "(R)");
7447 sectors
+= rdev
->sectors
;
7451 if (!list_empty(&mddev
->disks
)) {
7453 seq_printf(seq
, "\n %llu blocks",
7454 (unsigned long long)
7455 mddev
->array_sectors
/ 2);
7457 seq_printf(seq
, "\n %llu blocks",
7458 (unsigned long long)sectors
/ 2);
7460 if (mddev
->persistent
) {
7461 if (mddev
->major_version
!= 0 ||
7462 mddev
->minor_version
!= 90) {
7463 seq_printf(seq
," super %d.%d",
7464 mddev
->major_version
,
7465 mddev
->minor_version
);
7467 } else if (mddev
->external
)
7468 seq_printf(seq
, " super external:%s",
7469 mddev
->metadata_type
);
7471 seq_printf(seq
, " super non-persistent");
7474 mddev
->pers
->status(seq
, mddev
);
7475 seq_printf(seq
, "\n ");
7476 if (mddev
->pers
->sync_request
) {
7477 if (status_resync(seq
, mddev
))
7478 seq_printf(seq
, "\n ");
7481 seq_printf(seq
, "\n ");
7483 bitmap_status(seq
, mddev
->bitmap
);
7485 seq_printf(seq
, "\n");
7487 spin_unlock(&mddev
->lock
);
7492 static const struct seq_operations md_seq_ops
= {
7493 .start
= md_seq_start
,
7494 .next
= md_seq_next
,
7495 .stop
= md_seq_stop
,
7496 .show
= md_seq_show
,
7499 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7501 struct seq_file
*seq
;
7504 error
= seq_open(file
, &md_seq_ops
);
7508 seq
= file
->private_data
;
7509 seq
->poll_event
= atomic_read(&md_event_count
);
7513 static int md_unloading
;
7514 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7516 struct seq_file
*seq
= filp
->private_data
;
7520 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7521 poll_wait(filp
, &md_event_waiters
, wait
);
7523 /* always allow read */
7524 mask
= POLLIN
| POLLRDNORM
;
7526 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7527 mask
|= POLLERR
| POLLPRI
;
7531 static const struct file_operations md_seq_fops
= {
7532 .owner
= THIS_MODULE
,
7533 .open
= md_seq_open
,
7535 .llseek
= seq_lseek
,
7536 .release
= seq_release_private
,
7537 .poll
= mdstat_poll
,
7540 int register_md_personality(struct md_personality
*p
)
7542 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7544 spin_lock(&pers_lock
);
7545 list_add_tail(&p
->list
, &pers_list
);
7546 spin_unlock(&pers_lock
);
7549 EXPORT_SYMBOL(register_md_personality
);
7551 int unregister_md_personality(struct md_personality
*p
)
7553 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7554 spin_lock(&pers_lock
);
7555 list_del_init(&p
->list
);
7556 spin_unlock(&pers_lock
);
7559 EXPORT_SYMBOL(unregister_md_personality
);
7561 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7562 struct module
*module
)
7565 spin_lock(&pers_lock
);
7566 if (md_cluster_ops
!= NULL
)
7569 md_cluster_ops
= ops
;
7570 md_cluster_mod
= module
;
7572 spin_unlock(&pers_lock
);
7575 EXPORT_SYMBOL(register_md_cluster_operations
);
7577 int unregister_md_cluster_operations(void)
7579 spin_lock(&pers_lock
);
7580 md_cluster_ops
= NULL
;
7581 spin_unlock(&pers_lock
);
7584 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7586 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7590 err
= request_module("md-cluster");
7592 pr_err("md-cluster module not found.\n");
7596 spin_lock(&pers_lock
);
7597 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7598 spin_unlock(&pers_lock
);
7601 spin_unlock(&pers_lock
);
7603 return md_cluster_ops
->join(mddev
, nodes
);
7606 void md_cluster_stop(struct mddev
*mddev
)
7608 if (!md_cluster_ops
)
7610 md_cluster_ops
->leave(mddev
);
7611 module_put(md_cluster_mod
);
7614 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7616 struct md_rdev
*rdev
;
7622 rdev_for_each_rcu(rdev
, mddev
) {
7623 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7624 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7625 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7626 atomic_read(&disk
->sync_io
);
7627 /* sync IO will cause sync_io to increase before the disk_stats
7628 * as sync_io is counted when a request starts, and
7629 * disk_stats is counted when it completes.
7630 * So resync activity will cause curr_events to be smaller than
7631 * when there was no such activity.
7632 * non-sync IO will cause disk_stat to increase without
7633 * increasing sync_io so curr_events will (eventually)
7634 * be larger than it was before. Once it becomes
7635 * substantially larger, the test below will cause
7636 * the array to appear non-idle, and resync will slow
7638 * If there is a lot of outstanding resync activity when
7639 * we set last_event to curr_events, then all that activity
7640 * completing might cause the array to appear non-idle
7641 * and resync will be slowed down even though there might
7642 * not have been non-resync activity. This will only
7643 * happen once though. 'last_events' will soon reflect
7644 * the state where there is little or no outstanding
7645 * resync requests, and further resync activity will
7646 * always make curr_events less than last_events.
7649 if (init
|| curr_events
- rdev
->last_events
> 64) {
7650 rdev
->last_events
= curr_events
;
7658 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7660 /* another "blocks" (512byte) blocks have been synced */
7661 atomic_sub(blocks
, &mddev
->recovery_active
);
7662 wake_up(&mddev
->recovery_wait
);
7664 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7665 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7666 md_wakeup_thread(mddev
->thread
);
7667 // stop recovery, signal do_sync ....
7670 EXPORT_SYMBOL(md_done_sync
);
7672 /* md_write_start(mddev, bi)
7673 * If we need to update some array metadata (e.g. 'active' flag
7674 * in superblock) before writing, schedule a superblock update
7675 * and wait for it to complete.
7677 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7680 if (bio_data_dir(bi
) != WRITE
)
7683 BUG_ON(mddev
->ro
== 1);
7684 if (mddev
->ro
== 2) {
7685 /* need to switch to read/write */
7687 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7688 md_wakeup_thread(mddev
->thread
);
7689 md_wakeup_thread(mddev
->sync_thread
);
7692 atomic_inc(&mddev
->writes_pending
);
7693 if (mddev
->safemode
== 1)
7694 mddev
->safemode
= 0;
7695 if (mddev
->in_sync
) {
7696 spin_lock(&mddev
->lock
);
7697 if (mddev
->in_sync
) {
7699 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7700 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7701 md_wakeup_thread(mddev
->thread
);
7704 spin_unlock(&mddev
->lock
);
7707 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7708 wait_event(mddev
->sb_wait
,
7709 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7711 EXPORT_SYMBOL(md_write_start
);
7713 void md_write_end(struct mddev
*mddev
)
7715 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7716 if (mddev
->safemode
== 2)
7717 md_wakeup_thread(mddev
->thread
);
7718 else if (mddev
->safemode_delay
)
7719 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7722 EXPORT_SYMBOL(md_write_end
);
7724 /* md_allow_write(mddev)
7725 * Calling this ensures that the array is marked 'active' so that writes
7726 * may proceed without blocking. It is important to call this before
7727 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7728 * Must be called with mddev_lock held.
7730 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
7731 * is dropped, so return -EAGAIN after notifying userspace.
7733 int md_allow_write(struct mddev
*mddev
)
7739 if (!mddev
->pers
->sync_request
)
7742 spin_lock(&mddev
->lock
);
7743 if (mddev
->in_sync
) {
7745 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7746 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7747 if (mddev
->safemode_delay
&&
7748 mddev
->safemode
== 0)
7749 mddev
->safemode
= 1;
7750 spin_unlock(&mddev
->lock
);
7751 md_update_sb(mddev
, 0);
7752 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7754 spin_unlock(&mddev
->lock
);
7756 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7761 EXPORT_SYMBOL_GPL(md_allow_write
);
7763 #define SYNC_MARKS 10
7764 #define SYNC_MARK_STEP (3*HZ)
7765 #define UPDATE_FREQUENCY (5*60*HZ)
7766 void md_do_sync(struct md_thread
*thread
)
7768 struct mddev
*mddev
= thread
->mddev
;
7769 struct mddev
*mddev2
;
7770 unsigned int currspeed
= 0,
7772 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7773 unsigned long mark
[SYNC_MARKS
];
7774 unsigned long update_time
;
7775 sector_t mark_cnt
[SYNC_MARKS
];
7777 struct list_head
*tmp
;
7778 sector_t last_check
;
7780 struct md_rdev
*rdev
;
7781 char *desc
, *action
= NULL
;
7782 struct blk_plug plug
;
7783 bool cluster_resync_finished
= false;
7785 /* just incase thread restarts... */
7786 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7788 if (mddev
->ro
) {/* never try to sync a read-only array */
7789 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7793 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7794 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7795 desc
= "data-check";
7797 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7798 desc
= "requested-resync";
7802 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7807 mddev
->last_sync_action
= action
?: desc
;
7809 /* we overload curr_resync somewhat here.
7810 * 0 == not engaged in resync at all
7811 * 2 == checking that there is no conflict with another sync
7812 * 1 == like 2, but have yielded to allow conflicting resync to
7814 * other == active in resync - this many blocks
7816 * Before starting a resync we must have set curr_resync to
7817 * 2, and then checked that every "conflicting" array has curr_resync
7818 * less than ours. When we find one that is the same or higher
7819 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7820 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7821 * This will mean we have to start checking from the beginning again.
7826 mddev
->curr_resync
= 2;
7829 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7831 for_each_mddev(mddev2
, tmp
) {
7832 if (mddev2
== mddev
)
7834 if (!mddev
->parallel_resync
7835 && mddev2
->curr_resync
7836 && match_mddev_units(mddev
, mddev2
)) {
7838 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7839 /* arbitrarily yield */
7840 mddev
->curr_resync
= 1;
7841 wake_up(&resync_wait
);
7843 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7844 /* no need to wait here, we can wait the next
7845 * time 'round when curr_resync == 2
7848 /* We need to wait 'interruptible' so as not to
7849 * contribute to the load average, and not to
7850 * be caught by 'softlockup'
7852 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7853 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7854 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7855 printk(KERN_INFO
"md: delaying %s of %s"
7856 " until %s has finished (they"
7857 " share one or more physical units)\n",
7858 desc
, mdname(mddev
), mdname(mddev2
));
7860 if (signal_pending(current
))
7861 flush_signals(current
);
7863 finish_wait(&resync_wait
, &wq
);
7866 finish_wait(&resync_wait
, &wq
);
7869 } while (mddev
->curr_resync
< 2);
7872 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7873 /* resync follows the size requested by the personality,
7874 * which defaults to physical size, but can be virtual size
7876 max_sectors
= mddev
->resync_max_sectors
;
7877 atomic64_set(&mddev
->resync_mismatches
, 0);
7878 /* we don't use the checkpoint if there's a bitmap */
7879 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7880 j
= mddev
->resync_min
;
7881 else if (!mddev
->bitmap
)
7882 j
= mddev
->recovery_cp
;
7884 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7885 max_sectors
= mddev
->resync_max_sectors
;
7887 /* recovery follows the physical size of devices */
7888 max_sectors
= mddev
->dev_sectors
;
7891 rdev_for_each_rcu(rdev
, mddev
)
7892 if (rdev
->raid_disk
>= 0 &&
7893 !test_bit(Journal
, &rdev
->flags
) &&
7894 !test_bit(Faulty
, &rdev
->flags
) &&
7895 !test_bit(In_sync
, &rdev
->flags
) &&
7896 rdev
->recovery_offset
< j
)
7897 j
= rdev
->recovery_offset
;
7900 /* If there is a bitmap, we need to make sure all
7901 * writes that started before we added a spare
7902 * complete before we start doing a recovery.
7903 * Otherwise the write might complete and (via
7904 * bitmap_endwrite) set a bit in the bitmap after the
7905 * recovery has checked that bit and skipped that
7908 if (mddev
->bitmap
) {
7909 mddev
->pers
->quiesce(mddev
, 1);
7910 mddev
->pers
->quiesce(mddev
, 0);
7914 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7915 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7916 " %d KB/sec/disk.\n", speed_min(mddev
));
7917 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7918 "(but not more than %d KB/sec) for %s.\n",
7919 speed_max(mddev
), desc
);
7921 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7924 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7926 mark_cnt
[m
] = io_sectors
;
7929 mddev
->resync_mark
= mark
[last_mark
];
7930 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7933 * Tune reconstruction:
7935 window
= 32*(PAGE_SIZE
/512);
7936 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7937 window
/2, (unsigned long long)max_sectors
/2);
7939 atomic_set(&mddev
->recovery_active
, 0);
7944 "md: resuming %s of %s from checkpoint.\n",
7945 desc
, mdname(mddev
));
7946 mddev
->curr_resync
= j
;
7948 mddev
->curr_resync
= 3; /* no longer delayed */
7949 mddev
->curr_resync_completed
= j
;
7950 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7951 md_new_event(mddev
);
7952 update_time
= jiffies
;
7954 blk_start_plug(&plug
);
7955 while (j
< max_sectors
) {
7960 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7961 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7962 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7963 > (max_sectors
>> 4)) ||
7964 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7965 (j
- mddev
->curr_resync_completed
)*2
7966 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
7967 mddev
->curr_resync_completed
> mddev
->resync_max
7969 /* time to update curr_resync_completed */
7970 wait_event(mddev
->recovery_wait
,
7971 atomic_read(&mddev
->recovery_active
) == 0);
7972 mddev
->curr_resync_completed
= j
;
7973 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7974 j
> mddev
->recovery_cp
)
7975 mddev
->recovery_cp
= j
;
7976 update_time
= jiffies
;
7977 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7978 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7981 while (j
>= mddev
->resync_max
&&
7982 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7983 /* As this condition is controlled by user-space,
7984 * we can block indefinitely, so use '_interruptible'
7985 * to avoid triggering warnings.
7987 flush_signals(current
); /* just in case */
7988 wait_event_interruptible(mddev
->recovery_wait
,
7989 mddev
->resync_max
> j
7990 || test_bit(MD_RECOVERY_INTR
,
7994 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7997 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
7999 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8003 if (!skipped
) { /* actual IO requested */
8004 io_sectors
+= sectors
;
8005 atomic_add(sectors
, &mddev
->recovery_active
);
8008 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8012 if (j
> max_sectors
)
8013 /* when skipping, extra large numbers can be returned. */
8016 mddev
->curr_resync
= j
;
8017 mddev
->curr_mark_cnt
= io_sectors
;
8018 if (last_check
== 0)
8019 /* this is the earliest that rebuild will be
8020 * visible in /proc/mdstat
8022 md_new_event(mddev
);
8024 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8027 last_check
= io_sectors
;
8029 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8031 int next
= (last_mark
+1) % SYNC_MARKS
;
8033 mddev
->resync_mark
= mark
[next
];
8034 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8035 mark
[next
] = jiffies
;
8036 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8040 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8044 * this loop exits only if either when we are slower than
8045 * the 'hard' speed limit, or the system was IO-idle for
8047 * the system might be non-idle CPU-wise, but we only care
8048 * about not overloading the IO subsystem. (things like an
8049 * e2fsck being done on the RAID array should execute fast)
8053 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8054 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8055 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8057 if (currspeed
> speed_min(mddev
)) {
8058 if (currspeed
> speed_max(mddev
)) {
8062 if (!is_mddev_idle(mddev
, 0)) {
8064 * Give other IO more of a chance.
8065 * The faster the devices, the less we wait.
8067 wait_event(mddev
->recovery_wait
,
8068 !atomic_read(&mddev
->recovery_active
));
8072 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
8073 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8074 ? "interrupted" : "done");
8076 * this also signals 'finished resyncing' to md_stop
8078 blk_finish_plug(&plug
);
8079 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8081 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8082 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8083 mddev
->curr_resync
> 2) {
8084 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8085 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8087 /* tell personality and other nodes that we are finished */
8088 if (mddev_is_clustered(mddev
)) {
8089 md_cluster_ops
->resync_finish(mddev
);
8090 cluster_resync_finished
= true;
8092 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8094 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8095 mddev
->curr_resync
> 2) {
8096 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8097 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8098 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8100 "md: checkpointing %s of %s.\n",
8101 desc
, mdname(mddev
));
8102 if (test_bit(MD_RECOVERY_ERROR
,
8104 mddev
->recovery_cp
=
8105 mddev
->curr_resync_completed
;
8107 mddev
->recovery_cp
=
8111 mddev
->recovery_cp
= MaxSector
;
8113 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8114 mddev
->curr_resync
= MaxSector
;
8116 rdev_for_each_rcu(rdev
, mddev
)
8117 if (rdev
->raid_disk
>= 0 &&
8118 mddev
->delta_disks
>= 0 &&
8119 !test_bit(Journal
, &rdev
->flags
) &&
8120 !test_bit(Faulty
, &rdev
->flags
) &&
8121 !test_bit(In_sync
, &rdev
->flags
) &&
8122 rdev
->recovery_offset
< mddev
->curr_resync
)
8123 rdev
->recovery_offset
= mddev
->curr_resync
;
8128 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8130 if (mddev_is_clustered(mddev
) &&
8131 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8132 !cluster_resync_finished
)
8133 md_cluster_ops
->resync_finish(mddev
);
8135 spin_lock(&mddev
->lock
);
8136 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8137 /* We completed so min/max setting can be forgotten if used. */
8138 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8139 mddev
->resync_min
= 0;
8140 mddev
->resync_max
= MaxSector
;
8141 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8142 mddev
->resync_min
= mddev
->curr_resync_completed
;
8143 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8144 mddev
->curr_resync
= 0;
8145 spin_unlock(&mddev
->lock
);
8147 wake_up(&resync_wait
);
8148 md_wakeup_thread(mddev
->thread
);
8151 EXPORT_SYMBOL_GPL(md_do_sync
);
8153 static int remove_and_add_spares(struct mddev
*mddev
,
8154 struct md_rdev
*this)
8156 struct md_rdev
*rdev
;
8160 rdev_for_each(rdev
, mddev
)
8161 if ((this == NULL
|| rdev
== this) &&
8162 rdev
->raid_disk
>= 0 &&
8163 !test_bit(Blocked
, &rdev
->flags
) &&
8164 (test_bit(Faulty
, &rdev
->flags
) ||
8165 (!test_bit(In_sync
, &rdev
->flags
) &&
8166 !test_bit(Journal
, &rdev
->flags
))) &&
8167 atomic_read(&rdev
->nr_pending
)==0) {
8168 if (mddev
->pers
->hot_remove_disk(
8169 mddev
, rdev
) == 0) {
8170 sysfs_unlink_rdev(mddev
, rdev
);
8171 rdev
->raid_disk
= -1;
8175 if (removed
&& mddev
->kobj
.sd
)
8176 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8178 if (this && removed
)
8181 rdev_for_each(rdev
, mddev
) {
8182 if (this && this != rdev
)
8184 if (test_bit(Candidate
, &rdev
->flags
))
8186 if (rdev
->raid_disk
>= 0 &&
8187 !test_bit(In_sync
, &rdev
->flags
) &&
8188 !test_bit(Journal
, &rdev
->flags
) &&
8189 !test_bit(Faulty
, &rdev
->flags
))
8191 if (rdev
->raid_disk
>= 0)
8193 if (test_bit(Faulty
, &rdev
->flags
))
8195 if (!test_bit(Journal
, &rdev
->flags
)) {
8197 ! (rdev
->saved_raid_disk
>= 0 &&
8198 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8201 rdev
->recovery_offset
= 0;
8204 hot_add_disk(mddev
, rdev
) == 0) {
8205 if (sysfs_link_rdev(mddev
, rdev
))
8206 /* failure here is OK */;
8207 if (!test_bit(Journal
, &rdev
->flags
))
8209 md_new_event(mddev
);
8210 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8215 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8219 static void md_start_sync(struct work_struct
*ws
)
8221 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8224 if (mddev_is_clustered(mddev
)) {
8225 ret
= md_cluster_ops
->resync_start(mddev
);
8227 mddev
->sync_thread
= NULL
;
8232 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8236 if (!mddev
->sync_thread
) {
8237 if (!(mddev_is_clustered(mddev
) && ret
== -EAGAIN
))
8238 printk(KERN_ERR
"%s: could not start resync"
8241 /* leave the spares where they are, it shouldn't hurt */
8242 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8243 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8244 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8245 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8246 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8247 wake_up(&resync_wait
);
8248 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8250 if (mddev
->sysfs_action
)
8251 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8253 md_wakeup_thread(mddev
->sync_thread
);
8254 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8255 md_new_event(mddev
);
8259 * This routine is regularly called by all per-raid-array threads to
8260 * deal with generic issues like resync and super-block update.
8261 * Raid personalities that don't have a thread (linear/raid0) do not
8262 * need this as they never do any recovery or update the superblock.
8264 * It does not do any resync itself, but rather "forks" off other threads
8265 * to do that as needed.
8266 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8267 * "->recovery" and create a thread at ->sync_thread.
8268 * When the thread finishes it sets MD_RECOVERY_DONE
8269 * and wakeups up this thread which will reap the thread and finish up.
8270 * This thread also removes any faulty devices (with nr_pending == 0).
8272 * The overall approach is:
8273 * 1/ if the superblock needs updating, update it.
8274 * 2/ If a recovery thread is running, don't do anything else.
8275 * 3/ If recovery has finished, clean up, possibly marking spares active.
8276 * 4/ If there are any faulty devices, remove them.
8277 * 5/ If array is degraded, try to add spares devices
8278 * 6/ If array has spares or is not in-sync, start a resync thread.
8280 void md_check_recovery(struct mddev
*mddev
)
8282 if (mddev
->suspended
)
8286 bitmap_daemon_work(mddev
);
8288 if (signal_pending(current
)) {
8289 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8290 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8292 mddev
->safemode
= 2;
8294 flush_signals(current
);
8297 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8300 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8301 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8302 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8303 test_bit(MD_RELOAD_SB
, &mddev
->flags
) ||
8304 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8305 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8306 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8310 if (mddev_trylock(mddev
)) {
8314 struct md_rdev
*rdev
;
8315 if (!mddev
->external
&& mddev
->in_sync
)
8316 /* 'Blocked' flag not needed as failed devices
8317 * will be recorded if array switched to read/write.
8318 * Leaving it set will prevent the device
8319 * from being removed.
8321 rdev_for_each(rdev
, mddev
)
8322 clear_bit(Blocked
, &rdev
->flags
);
8323 /* On a read-only array we can:
8324 * - remove failed devices
8325 * - add already-in_sync devices if the array itself
8327 * As we only add devices that are already in-sync,
8328 * we can activate the spares immediately.
8330 remove_and_add_spares(mddev
, NULL
);
8331 /* There is no thread, but we need to call
8332 * ->spare_active and clear saved_raid_disk
8334 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8335 md_reap_sync_thread(mddev
);
8336 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8337 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8338 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
8342 if (mddev_is_clustered(mddev
)) {
8343 struct md_rdev
*rdev
;
8344 /* kick the device if another node issued a
8347 rdev_for_each(rdev
, mddev
) {
8348 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8349 rdev
->raid_disk
< 0)
8350 md_kick_rdev_from_array(rdev
);
8353 if (test_and_clear_bit(MD_RELOAD_SB
, &mddev
->flags
))
8354 md_reload_sb(mddev
, mddev
->good_device_nr
);
8357 if (!mddev
->external
) {
8359 spin_lock(&mddev
->lock
);
8360 if (mddev
->safemode
&&
8361 !atomic_read(&mddev
->writes_pending
) &&
8363 mddev
->recovery_cp
== MaxSector
) {
8366 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8368 if (mddev
->safemode
== 1)
8369 mddev
->safemode
= 0;
8370 spin_unlock(&mddev
->lock
);
8372 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8375 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
8376 md_update_sb(mddev
, 0);
8378 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8379 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8380 /* resync/recovery still happening */
8381 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8384 if (mddev
->sync_thread
) {
8385 md_reap_sync_thread(mddev
);
8388 /* Set RUNNING before clearing NEEDED to avoid
8389 * any transients in the value of "sync_action".
8391 mddev
->curr_resync_completed
= 0;
8392 spin_lock(&mddev
->lock
);
8393 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8394 spin_unlock(&mddev
->lock
);
8395 /* Clear some bits that don't mean anything, but
8398 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8399 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8401 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8402 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8404 /* no recovery is running.
8405 * remove any failed drives, then
8406 * add spares if possible.
8407 * Spares are also removed and re-added, to allow
8408 * the personality to fail the re-add.
8411 if (mddev
->reshape_position
!= MaxSector
) {
8412 if (mddev
->pers
->check_reshape
== NULL
||
8413 mddev
->pers
->check_reshape(mddev
) != 0)
8414 /* Cannot proceed */
8416 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8417 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8418 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8419 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8420 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8421 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8422 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8423 } else if (mddev
->recovery_cp
< MaxSector
) {
8424 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8425 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8426 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8427 /* nothing to be done ... */
8430 if (mddev
->pers
->sync_request
) {
8432 /* We are adding a device or devices to an array
8433 * which has the bitmap stored on all devices.
8434 * So make sure all bitmap pages get written
8436 bitmap_write_all(mddev
->bitmap
);
8438 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8439 queue_work(md_misc_wq
, &mddev
->del_work
);
8443 if (!mddev
->sync_thread
) {
8444 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8445 wake_up(&resync_wait
);
8446 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8448 if (mddev
->sysfs_action
)
8449 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8452 wake_up(&mddev
->sb_wait
);
8453 mddev_unlock(mddev
);
8456 EXPORT_SYMBOL(md_check_recovery
);
8458 void md_reap_sync_thread(struct mddev
*mddev
)
8460 struct md_rdev
*rdev
;
8462 /* resync has finished, collect result */
8463 md_unregister_thread(&mddev
->sync_thread
);
8464 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8465 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8467 /* activate any spares */
8468 if (mddev
->pers
->spare_active(mddev
)) {
8469 sysfs_notify(&mddev
->kobj
, NULL
,
8471 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8474 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8475 mddev
->pers
->finish_reshape
)
8476 mddev
->pers
->finish_reshape(mddev
);
8478 /* If array is no-longer degraded, then any saved_raid_disk
8479 * information must be scrapped.
8481 if (!mddev
->degraded
)
8482 rdev_for_each(rdev
, mddev
)
8483 rdev
->saved_raid_disk
= -1;
8485 md_update_sb(mddev
, 1);
8486 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8487 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8488 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8489 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8490 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8491 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8492 wake_up(&resync_wait
);
8493 /* flag recovery needed just to double check */
8494 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8495 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8496 md_new_event(mddev
);
8497 if (mddev
->event_work
.func
)
8498 queue_work(md_misc_wq
, &mddev
->event_work
);
8500 EXPORT_SYMBOL(md_reap_sync_thread
);
8502 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8504 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8505 wait_event_timeout(rdev
->blocked_wait
,
8506 !test_bit(Blocked
, &rdev
->flags
) &&
8507 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8508 msecs_to_jiffies(5000));
8509 rdev_dec_pending(rdev
, mddev
);
8511 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8513 void md_finish_reshape(struct mddev
*mddev
)
8515 /* called be personality module when reshape completes. */
8516 struct md_rdev
*rdev
;
8518 rdev_for_each(rdev
, mddev
) {
8519 if (rdev
->data_offset
> rdev
->new_data_offset
)
8520 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8522 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8523 rdev
->data_offset
= rdev
->new_data_offset
;
8526 EXPORT_SYMBOL(md_finish_reshape
);
8528 /* Bad block management */
8530 /* Returns 1 on success, 0 on failure */
8531 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8536 s
+= rdev
->new_data_offset
;
8538 s
+= rdev
->data_offset
;
8539 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8541 /* Make sure they get written out promptly */
8542 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8543 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8544 set_bit(MD_CHANGE_PENDING
, &rdev
->mddev
->flags
);
8545 md_wakeup_thread(rdev
->mddev
->thread
);
8550 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8552 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8556 s
+= rdev
->new_data_offset
;
8558 s
+= rdev
->data_offset
;
8559 return badblocks_clear(&rdev
->badblocks
,
8562 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8564 static int md_notify_reboot(struct notifier_block
*this,
8565 unsigned long code
, void *x
)
8567 struct list_head
*tmp
;
8568 struct mddev
*mddev
;
8571 for_each_mddev(mddev
, tmp
) {
8572 if (mddev_trylock(mddev
)) {
8574 __md_stop_writes(mddev
);
8575 if (mddev
->persistent
)
8576 mddev
->safemode
= 2;
8577 mddev_unlock(mddev
);
8582 * certain more exotic SCSI devices are known to be
8583 * volatile wrt too early system reboots. While the
8584 * right place to handle this issue is the given
8585 * driver, we do want to have a safe RAID driver ...
8593 static struct notifier_block md_notifier
= {
8594 .notifier_call
= md_notify_reboot
,
8596 .priority
= INT_MAX
, /* before any real devices */
8599 static void md_geninit(void)
8601 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8603 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8606 static int __init
md_init(void)
8610 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8614 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8618 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8621 if ((ret
= register_blkdev(0, "mdp")) < 0)
8625 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8626 md_probe
, NULL
, NULL
);
8627 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8628 md_probe
, NULL
, NULL
);
8630 register_reboot_notifier(&md_notifier
);
8631 raid_table_header
= register_sysctl_table(raid_root_table
);
8637 unregister_blkdev(MD_MAJOR
, "md");
8639 destroy_workqueue(md_misc_wq
);
8641 destroy_workqueue(md_wq
);
8646 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8648 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8649 struct md_rdev
*rdev2
;
8651 char b
[BDEVNAME_SIZE
];
8653 /* Check for change of roles in the active devices */
8654 rdev_for_each(rdev2
, mddev
) {
8655 if (test_bit(Faulty
, &rdev2
->flags
))
8658 /* Check if the roles changed */
8659 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8661 if (test_bit(Candidate
, &rdev2
->flags
)) {
8662 if (role
== 0xfffe) {
8663 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
8664 md_kick_rdev_from_array(rdev2
);
8668 clear_bit(Candidate
, &rdev2
->flags
);
8671 if (role
!= rdev2
->raid_disk
) {
8673 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
8674 rdev2
->saved_raid_disk
= role
;
8675 ret
= remove_and_add_spares(mddev
, rdev2
);
8676 pr_info("Activated spare: %s\n",
8677 bdevname(rdev2
->bdev
,b
));
8680 * We just want to do the minimum to mark the disk
8681 * as faulty. The recovery is performed by the
8682 * one who initiated the error.
8684 if ((role
== 0xfffe) || (role
== 0xfffd)) {
8685 md_error(mddev
, rdev2
);
8686 clear_bit(Blocked
, &rdev2
->flags
);
8691 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
8692 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
8694 /* Finally set the event to be up to date */
8695 mddev
->events
= le64_to_cpu(sb
->events
);
8698 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
8701 struct page
*swapout
= rdev
->sb_page
;
8702 struct mdp_superblock_1
*sb
;
8704 /* Store the sb page of the rdev in the swapout temporary
8705 * variable in case we err in the future
8707 rdev
->sb_page
= NULL
;
8708 alloc_disk_sb(rdev
);
8709 ClearPageUptodate(rdev
->sb_page
);
8710 rdev
->sb_loaded
= 0;
8711 err
= super_types
[mddev
->major_version
].load_super(rdev
, NULL
, mddev
->minor_version
);
8714 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8715 __func__
, __LINE__
, rdev
->desc_nr
, err
);
8716 put_page(rdev
->sb_page
);
8717 rdev
->sb_page
= swapout
;
8718 rdev
->sb_loaded
= 1;
8722 sb
= page_address(rdev
->sb_page
);
8723 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8727 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
8728 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
8730 /* The other node finished recovery, call spare_active to set
8731 * device In_sync and mddev->degraded
8733 if (rdev
->recovery_offset
== MaxSector
&&
8734 !test_bit(In_sync
, &rdev
->flags
) &&
8735 mddev
->pers
->spare_active(mddev
))
8736 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8742 void md_reload_sb(struct mddev
*mddev
, int nr
)
8744 struct md_rdev
*rdev
;
8748 rdev_for_each_rcu(rdev
, mddev
) {
8749 if (rdev
->desc_nr
== nr
)
8753 if (!rdev
|| rdev
->desc_nr
!= nr
) {
8754 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
8758 err
= read_rdev(mddev
, rdev
);
8762 check_sb_changes(mddev
, rdev
);
8764 /* Read all rdev's to update recovery_offset */
8765 rdev_for_each_rcu(rdev
, mddev
)
8766 read_rdev(mddev
, rdev
);
8768 EXPORT_SYMBOL(md_reload_sb
);
8773 * Searches all registered partitions for autorun RAID arrays
8777 static LIST_HEAD(all_detected_devices
);
8778 struct detected_devices_node
{
8779 struct list_head list
;
8783 void md_autodetect_dev(dev_t dev
)
8785 struct detected_devices_node
*node_detected_dev
;
8787 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8788 if (node_detected_dev
) {
8789 node_detected_dev
->dev
= dev
;
8790 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8792 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8793 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8797 static void autostart_arrays(int part
)
8799 struct md_rdev
*rdev
;
8800 struct detected_devices_node
*node_detected_dev
;
8802 int i_scanned
, i_passed
;
8807 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8809 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8811 node_detected_dev
= list_entry(all_detected_devices
.next
,
8812 struct detected_devices_node
, list
);
8813 list_del(&node_detected_dev
->list
);
8814 dev
= node_detected_dev
->dev
;
8815 kfree(node_detected_dev
);
8816 rdev
= md_import_device(dev
,0, 90);
8820 if (test_bit(Faulty
, &rdev
->flags
))
8823 set_bit(AutoDetected
, &rdev
->flags
);
8824 list_add(&rdev
->same_set
, &pending_raid_disks
);
8828 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8829 i_scanned
, i_passed
);
8831 autorun_devices(part
);
8834 #endif /* !MODULE */
8836 static __exit
void md_exit(void)
8838 struct mddev
*mddev
;
8839 struct list_head
*tmp
;
8842 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8843 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8845 unregister_blkdev(MD_MAJOR
,"md");
8846 unregister_blkdev(mdp_major
, "mdp");
8847 unregister_reboot_notifier(&md_notifier
);
8848 unregister_sysctl_table(raid_table_header
);
8850 /* We cannot unload the modules while some process is
8851 * waiting for us in select() or poll() - wake them up
8854 while (waitqueue_active(&md_event_waiters
)) {
8855 /* not safe to leave yet */
8856 wake_up(&md_event_waiters
);
8860 remove_proc_entry("mdstat", NULL
);
8862 for_each_mddev(mddev
, tmp
) {
8863 export_array(mddev
);
8864 mddev
->hold_active
= 0;
8866 destroy_workqueue(md_misc_wq
);
8867 destroy_workqueue(md_wq
);
8870 subsys_initcall(md_init
);
8871 module_exit(md_exit
)
8873 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8875 return sprintf(buffer
, "%d", start_readonly
);
8877 static int set_ro(const char *val
, struct kernel_param
*kp
)
8879 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
8882 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8883 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8884 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8886 MODULE_LICENSE("GPL");
8887 MODULE_DESCRIPTION("MD RAID framework");
8889 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);