2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
56 #include "md-cluster.h"
59 static void autostart_arrays(int part
);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list
);
68 static DEFINE_SPINLOCK(pers_lock
);
70 struct md_cluster_operations
*md_cluster_ops
;
71 EXPORT_SYMBOL(md_cluster_ops
);
72 struct module
*md_cluster_mod
;
73 EXPORT_SYMBOL(md_cluster_mod
);
75 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
76 static struct workqueue_struct
*md_wq
;
77 static struct workqueue_struct
*md_misc_wq
;
79 static int remove_and_add_spares(struct mddev
*mddev
,
80 struct md_rdev
*this);
81 static void mddev_detach(struct mddev
*mddev
);
84 * Default number of read corrections we'll attempt on an rdev
85 * before ejecting it from the array. We divide the read error
86 * count by 2 for every hour elapsed between read errors.
88 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
90 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
91 * is 1000 KB/sec, so the extra system load does not show up that much.
92 * Increase it if you want to have more _guaranteed_ speed. Note that
93 * the RAID driver will use the maximum available bandwidth if the IO
94 * subsystem is idle. There is also an 'absolute maximum' reconstruction
95 * speed limit - in case reconstruction slows down your system despite
98 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
99 * or /sys/block/mdX/md/sync_speed_{min,max}
102 static int sysctl_speed_limit_min
= 1000;
103 static int sysctl_speed_limit_max
= 200000;
104 static inline int speed_min(struct mddev
*mddev
)
106 return mddev
->sync_speed_min
?
107 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
110 static inline int speed_max(struct mddev
*mddev
)
112 return mddev
->sync_speed_max
?
113 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
116 static struct ctl_table_header
*raid_table_header
;
118 static struct ctl_table raid_table
[] = {
120 .procname
= "speed_limit_min",
121 .data
= &sysctl_speed_limit_min
,
122 .maxlen
= sizeof(int),
123 .mode
= S_IRUGO
|S_IWUSR
,
124 .proc_handler
= proc_dointvec
,
127 .procname
= "speed_limit_max",
128 .data
= &sysctl_speed_limit_max
,
129 .maxlen
= sizeof(int),
130 .mode
= S_IRUGO
|S_IWUSR
,
131 .proc_handler
= proc_dointvec
,
136 static struct ctl_table raid_dir_table
[] = {
140 .mode
= S_IRUGO
|S_IXUGO
,
146 static struct ctl_table raid_root_table
[] = {
151 .child
= raid_dir_table
,
156 static const struct block_device_operations md_fops
;
158 static int start_readonly
;
161 * like bio_clone, but with a local bio set
164 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
169 if (!mddev
|| !mddev
->bio_set
)
170 return bio_alloc(gfp_mask
, nr_iovecs
);
172 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
177 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
179 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
182 if (!mddev
|| !mddev
->bio_set
)
183 return bio_clone(bio
, gfp_mask
);
185 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
187 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
190 * We have a system wide 'event count' that is incremented
191 * on any 'interesting' event, and readers of /proc/mdstat
192 * can use 'poll' or 'select' to find out when the event
196 * start array, stop array, error, add device, remove device,
197 * start build, activate spare
199 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
200 static atomic_t md_event_count
;
201 void md_new_event(struct mddev
*mddev
)
203 atomic_inc(&md_event_count
);
204 wake_up(&md_event_waiters
);
206 EXPORT_SYMBOL_GPL(md_new_event
);
208 /* Alternate version that can be called from interrupts
209 * when calling sysfs_notify isn't needed.
211 static void md_new_event_inintr(struct mddev
*mddev
)
213 atomic_inc(&md_event_count
);
214 wake_up(&md_event_waiters
);
218 * Enables to iterate over all existing md arrays
219 * all_mddevs_lock protects this list.
221 static LIST_HEAD(all_mddevs
);
222 static DEFINE_SPINLOCK(all_mddevs_lock
);
225 * iterates through all used mddevs in the system.
226 * We take care to grab the all_mddevs_lock whenever navigating
227 * the list, and to always hold a refcount when unlocked.
228 * Any code which breaks out of this loop while own
229 * a reference to the current mddev and must mddev_put it.
231 #define for_each_mddev(_mddev,_tmp) \
233 for (({ spin_lock(&all_mddevs_lock); \
234 _tmp = all_mddevs.next; \
236 ({ if (_tmp != &all_mddevs) \
237 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
238 spin_unlock(&all_mddevs_lock); \
239 if (_mddev) mddev_put(_mddev); \
240 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
241 _tmp != &all_mddevs;}); \
242 ({ spin_lock(&all_mddevs_lock); \
243 _tmp = _tmp->next;}) \
246 /* Rather than calling directly into the personality make_request function,
247 * IO requests come here first so that we can check if the device is
248 * being suspended pending a reconfiguration.
249 * We hold a refcount over the call to ->make_request. By the time that
250 * call has finished, the bio has been linked into some internal structure
251 * and so is visible to ->quiesce(), so we don't need the refcount any more.
253 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
255 const int rw
= bio_data_dir(bio
);
256 struct mddev
*mddev
= q
->queuedata
;
257 unsigned int sectors
;
260 blk_queue_split(q
, &bio
, q
->bio_split
);
262 if (mddev
== NULL
|| mddev
->pers
== NULL
265 return BLK_QC_T_NONE
;
267 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
268 if (bio_sectors(bio
) != 0)
269 bio
->bi_error
= -EROFS
;
271 return BLK_QC_T_NONE
;
273 smp_rmb(); /* Ensure implications of 'active' are visible */
275 if (mddev
->suspended
) {
278 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
279 TASK_UNINTERRUPTIBLE
);
280 if (!mddev
->suspended
)
286 finish_wait(&mddev
->sb_wait
, &__wait
);
288 atomic_inc(&mddev
->active_io
);
292 * save the sectors now since our bio can
293 * go away inside make_request
295 sectors
= bio_sectors(bio
);
296 /* bio could be mergeable after passing to underlayer */
297 bio
->bi_rw
&= ~REQ_NOMERGE
;
298 mddev
->pers
->make_request(mddev
, bio
);
300 cpu
= part_stat_lock();
301 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
302 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
305 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
306 wake_up(&mddev
->sb_wait
);
308 return BLK_QC_T_NONE
;
311 /* mddev_suspend makes sure no new requests are submitted
312 * to the device, and that any requests that have been submitted
313 * are completely handled.
314 * Once mddev_detach() is called and completes, the module will be
317 void mddev_suspend(struct mddev
*mddev
)
319 if (mddev
->suspended
++)
322 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
323 mddev
->pers
->quiesce(mddev
, 1);
325 del_timer_sync(&mddev
->safemode_timer
);
327 EXPORT_SYMBOL_GPL(mddev_suspend
);
329 void mddev_resume(struct mddev
*mddev
)
331 if (--mddev
->suspended
)
333 wake_up(&mddev
->sb_wait
);
334 mddev
->pers
->quiesce(mddev
, 0);
336 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
337 md_wakeup_thread(mddev
->thread
);
338 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
340 EXPORT_SYMBOL_GPL(mddev_resume
);
342 int mddev_congested(struct mddev
*mddev
, int bits
)
344 struct md_personality
*pers
= mddev
->pers
;
348 if (mddev
->suspended
)
350 else if (pers
&& pers
->congested
)
351 ret
= pers
->congested(mddev
, bits
);
355 EXPORT_SYMBOL_GPL(mddev_congested
);
356 static int md_congested(void *data
, int bits
)
358 struct mddev
*mddev
= data
;
359 return mddev_congested(mddev
, bits
);
363 * Generic flush handling for md
366 static void md_end_flush(struct bio
*bio
)
368 struct md_rdev
*rdev
= bio
->bi_private
;
369 struct mddev
*mddev
= rdev
->mddev
;
371 rdev_dec_pending(rdev
, mddev
);
373 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
374 /* The pre-request flush has finished */
375 queue_work(md_wq
, &mddev
->flush_work
);
380 static void md_submit_flush_data(struct work_struct
*ws
);
382 static void submit_flushes(struct work_struct
*ws
)
384 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
385 struct md_rdev
*rdev
;
387 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
388 atomic_set(&mddev
->flush_pending
, 1);
390 rdev_for_each_rcu(rdev
, mddev
)
391 if (rdev
->raid_disk
>= 0 &&
392 !test_bit(Faulty
, &rdev
->flags
)) {
393 /* Take two references, one is dropped
394 * when request finishes, one after
395 * we reclaim rcu_read_lock
398 atomic_inc(&rdev
->nr_pending
);
399 atomic_inc(&rdev
->nr_pending
);
401 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
402 bi
->bi_end_io
= md_end_flush
;
403 bi
->bi_private
= rdev
;
404 bi
->bi_bdev
= rdev
->bdev
;
405 atomic_inc(&mddev
->flush_pending
);
406 submit_bio(WRITE_FLUSH
, bi
);
408 rdev_dec_pending(rdev
, mddev
);
411 if (atomic_dec_and_test(&mddev
->flush_pending
))
412 queue_work(md_wq
, &mddev
->flush_work
);
415 static void md_submit_flush_data(struct work_struct
*ws
)
417 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
418 struct bio
*bio
= mddev
->flush_bio
;
420 if (bio
->bi_iter
.bi_size
== 0)
421 /* an empty barrier - all done */
424 bio
->bi_rw
&= ~REQ_FLUSH
;
425 mddev
->pers
->make_request(mddev
, bio
);
428 mddev
->flush_bio
= NULL
;
429 wake_up(&mddev
->sb_wait
);
432 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
434 spin_lock_irq(&mddev
->lock
);
435 wait_event_lock_irq(mddev
->sb_wait
,
438 mddev
->flush_bio
= bio
;
439 spin_unlock_irq(&mddev
->lock
);
441 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
442 queue_work(md_wq
, &mddev
->flush_work
);
444 EXPORT_SYMBOL(md_flush_request
);
446 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
448 struct mddev
*mddev
= cb
->data
;
449 md_wakeup_thread(mddev
->thread
);
452 EXPORT_SYMBOL(md_unplug
);
454 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
456 atomic_inc(&mddev
->active
);
460 static void mddev_delayed_delete(struct work_struct
*ws
);
462 static void mddev_put(struct mddev
*mddev
)
464 struct bio_set
*bs
= NULL
;
466 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
468 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
469 mddev
->ctime
== 0 && !mddev
->hold_active
) {
470 /* Array is not configured at all, and not held active,
472 list_del_init(&mddev
->all_mddevs
);
474 mddev
->bio_set
= NULL
;
475 if (mddev
->gendisk
) {
476 /* We did a probe so need to clean up. Call
477 * queue_work inside the spinlock so that
478 * flush_workqueue() after mddev_find will
479 * succeed in waiting for the work to be done.
481 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
482 queue_work(md_misc_wq
, &mddev
->del_work
);
486 spin_unlock(&all_mddevs_lock
);
491 static void md_safemode_timeout(unsigned long data
);
493 void mddev_init(struct mddev
*mddev
)
495 mutex_init(&mddev
->open_mutex
);
496 mutex_init(&mddev
->reconfig_mutex
);
497 mutex_init(&mddev
->bitmap_info
.mutex
);
498 INIT_LIST_HEAD(&mddev
->disks
);
499 INIT_LIST_HEAD(&mddev
->all_mddevs
);
500 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
501 (unsigned long) mddev
);
502 atomic_set(&mddev
->active
, 1);
503 atomic_set(&mddev
->openers
, 0);
504 atomic_set(&mddev
->active_io
, 0);
505 spin_lock_init(&mddev
->lock
);
506 atomic_set(&mddev
->flush_pending
, 0);
507 init_waitqueue_head(&mddev
->sb_wait
);
508 init_waitqueue_head(&mddev
->recovery_wait
);
509 mddev
->reshape_position
= MaxSector
;
510 mddev
->reshape_backwards
= 0;
511 mddev
->last_sync_action
= "none";
512 mddev
->resync_min
= 0;
513 mddev
->resync_max
= MaxSector
;
514 mddev
->level
= LEVEL_NONE
;
516 EXPORT_SYMBOL_GPL(mddev_init
);
518 static struct mddev
*mddev_find(dev_t unit
)
520 struct mddev
*mddev
, *new = NULL
;
522 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
523 unit
&= ~((1<<MdpMinorShift
)-1);
526 spin_lock(&all_mddevs_lock
);
529 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
530 if (mddev
->unit
== unit
) {
532 spin_unlock(&all_mddevs_lock
);
538 list_add(&new->all_mddevs
, &all_mddevs
);
539 spin_unlock(&all_mddevs_lock
);
540 new->hold_active
= UNTIL_IOCTL
;
544 /* find an unused unit number */
545 static int next_minor
= 512;
546 int start
= next_minor
;
550 dev
= MKDEV(MD_MAJOR
, next_minor
);
552 if (next_minor
> MINORMASK
)
554 if (next_minor
== start
) {
555 /* Oh dear, all in use. */
556 spin_unlock(&all_mddevs_lock
);
562 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
563 if (mddev
->unit
== dev
) {
569 new->md_minor
= MINOR(dev
);
570 new->hold_active
= UNTIL_STOP
;
571 list_add(&new->all_mddevs
, &all_mddevs
);
572 spin_unlock(&all_mddevs_lock
);
575 spin_unlock(&all_mddevs_lock
);
577 new = kzalloc(sizeof(*new), GFP_KERNEL
);
582 if (MAJOR(unit
) == MD_MAJOR
)
583 new->md_minor
= MINOR(unit
);
585 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
592 static struct attribute_group md_redundancy_group
;
594 void mddev_unlock(struct mddev
*mddev
)
596 if (mddev
->to_remove
) {
597 /* These cannot be removed under reconfig_mutex as
598 * an access to the files will try to take reconfig_mutex
599 * while holding the file unremovable, which leads to
601 * So hold set sysfs_active while the remove in happeing,
602 * and anything else which might set ->to_remove or my
603 * otherwise change the sysfs namespace will fail with
604 * -EBUSY if sysfs_active is still set.
605 * We set sysfs_active under reconfig_mutex and elsewhere
606 * test it under the same mutex to ensure its correct value
609 struct attribute_group
*to_remove
= mddev
->to_remove
;
610 mddev
->to_remove
= NULL
;
611 mddev
->sysfs_active
= 1;
612 mutex_unlock(&mddev
->reconfig_mutex
);
614 if (mddev
->kobj
.sd
) {
615 if (to_remove
!= &md_redundancy_group
)
616 sysfs_remove_group(&mddev
->kobj
, to_remove
);
617 if (mddev
->pers
== NULL
||
618 mddev
->pers
->sync_request
== NULL
) {
619 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
620 if (mddev
->sysfs_action
)
621 sysfs_put(mddev
->sysfs_action
);
622 mddev
->sysfs_action
= NULL
;
625 mddev
->sysfs_active
= 0;
627 mutex_unlock(&mddev
->reconfig_mutex
);
629 /* As we've dropped the mutex we need a spinlock to
630 * make sure the thread doesn't disappear
632 spin_lock(&pers_lock
);
633 md_wakeup_thread(mddev
->thread
);
634 spin_unlock(&pers_lock
);
636 EXPORT_SYMBOL_GPL(mddev_unlock
);
638 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
640 struct md_rdev
*rdev
;
642 rdev_for_each_rcu(rdev
, mddev
)
643 if (rdev
->desc_nr
== nr
)
648 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
650 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
652 struct md_rdev
*rdev
;
654 rdev_for_each(rdev
, mddev
)
655 if (rdev
->bdev
->bd_dev
== dev
)
661 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
663 struct md_rdev
*rdev
;
665 rdev_for_each_rcu(rdev
, mddev
)
666 if (rdev
->bdev
->bd_dev
== dev
)
672 static struct md_personality
*find_pers(int level
, char *clevel
)
674 struct md_personality
*pers
;
675 list_for_each_entry(pers
, &pers_list
, list
) {
676 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
678 if (strcmp(pers
->name
, clevel
)==0)
684 /* return the offset of the super block in 512byte sectors */
685 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
687 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
688 return MD_NEW_SIZE_SECTORS(num_sectors
);
691 static int alloc_disk_sb(struct md_rdev
*rdev
)
693 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
694 if (!rdev
->sb_page
) {
695 printk(KERN_ALERT
"md: out of memory.\n");
702 void md_rdev_clear(struct md_rdev
*rdev
)
705 put_page(rdev
->sb_page
);
707 rdev
->sb_page
= NULL
;
712 put_page(rdev
->bb_page
);
713 rdev
->bb_page
= NULL
;
715 kfree(rdev
->badblocks
.page
);
716 rdev
->badblocks
.page
= NULL
;
718 EXPORT_SYMBOL_GPL(md_rdev_clear
);
720 static void super_written(struct bio
*bio
)
722 struct md_rdev
*rdev
= bio
->bi_private
;
723 struct mddev
*mddev
= rdev
->mddev
;
726 printk("md: super_written gets error=%d\n", bio
->bi_error
);
727 md_error(mddev
, rdev
);
730 if (atomic_dec_and_test(&mddev
->pending_writes
))
731 wake_up(&mddev
->sb_wait
);
735 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
736 sector_t sector
, int size
, struct page
*page
)
738 /* write first size bytes of page to sector of rdev
739 * Increment mddev->pending_writes before returning
740 * and decrement it on completion, waking up sb_wait
741 * if zero is reached.
742 * If an error occurred, call md_error
744 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
746 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
747 bio
->bi_iter
.bi_sector
= sector
;
748 bio_add_page(bio
, page
, size
, 0);
749 bio
->bi_private
= rdev
;
750 bio
->bi_end_io
= super_written
;
752 atomic_inc(&mddev
->pending_writes
);
753 submit_bio(WRITE_FLUSH_FUA
, bio
);
756 void md_super_wait(struct mddev
*mddev
)
758 /* wait for all superblock writes that were scheduled to complete */
759 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
762 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
763 struct page
*page
, int rw
, bool metadata_op
)
765 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
768 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
769 rdev
->meta_bdev
: rdev
->bdev
;
771 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
772 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
773 (rdev
->mddev
->reshape_backwards
==
774 (sector
>= rdev
->mddev
->reshape_position
)))
775 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
777 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
778 bio_add_page(bio
, page
, size
, 0);
779 submit_bio_wait(rw
, bio
);
781 ret
= !bio
->bi_error
;
785 EXPORT_SYMBOL_GPL(sync_page_io
);
787 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
789 char b
[BDEVNAME_SIZE
];
794 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
800 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
801 bdevname(rdev
->bdev
,b
));
805 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
807 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
808 sb1
->set_uuid1
== sb2
->set_uuid1
&&
809 sb1
->set_uuid2
== sb2
->set_uuid2
&&
810 sb1
->set_uuid3
== sb2
->set_uuid3
;
813 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
816 mdp_super_t
*tmp1
, *tmp2
;
818 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
819 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
821 if (!tmp1
|| !tmp2
) {
823 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
831 * nr_disks is not constant
836 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
843 static u32
md_csum_fold(u32 csum
)
845 csum
= (csum
& 0xffff) + (csum
>> 16);
846 return (csum
& 0xffff) + (csum
>> 16);
849 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
852 u32
*sb32
= (u32
*)sb
;
854 unsigned int disk_csum
, csum
;
856 disk_csum
= sb
->sb_csum
;
859 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
861 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
864 /* This used to use csum_partial, which was wrong for several
865 * reasons including that different results are returned on
866 * different architectures. It isn't critical that we get exactly
867 * the same return value as before (we always csum_fold before
868 * testing, and that removes any differences). However as we
869 * know that csum_partial always returned a 16bit value on
870 * alphas, do a fold to maximise conformity to previous behaviour.
872 sb
->sb_csum
= md_csum_fold(disk_csum
);
874 sb
->sb_csum
= disk_csum
;
880 * Handle superblock details.
881 * We want to be able to handle multiple superblock formats
882 * so we have a common interface to them all, and an array of
883 * different handlers.
884 * We rely on user-space to write the initial superblock, and support
885 * reading and updating of superblocks.
886 * Interface methods are:
887 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
888 * loads and validates a superblock on dev.
889 * if refdev != NULL, compare superblocks on both devices
891 * 0 - dev has a superblock that is compatible with refdev
892 * 1 - dev has a superblock that is compatible and newer than refdev
893 * so dev should be used as the refdev in future
894 * -EINVAL superblock incompatible or invalid
895 * -othererror e.g. -EIO
897 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
898 * Verify that dev is acceptable into mddev.
899 * The first time, mddev->raid_disks will be 0, and data from
900 * dev should be merged in. Subsequent calls check that dev
901 * is new enough. Return 0 or -EINVAL
903 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
904 * Update the superblock for rdev with data in mddev
905 * This does not write to disc.
911 struct module
*owner
;
912 int (*load_super
)(struct md_rdev
*rdev
,
913 struct md_rdev
*refdev
,
915 int (*validate_super
)(struct mddev
*mddev
,
916 struct md_rdev
*rdev
);
917 void (*sync_super
)(struct mddev
*mddev
,
918 struct md_rdev
*rdev
);
919 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
920 sector_t num_sectors
);
921 int (*allow_new_offset
)(struct md_rdev
*rdev
,
922 unsigned long long new_offset
);
926 * Check that the given mddev has no bitmap.
928 * This function is called from the run method of all personalities that do not
929 * support bitmaps. It prints an error message and returns non-zero if mddev
930 * has a bitmap. Otherwise, it returns 0.
933 int md_check_no_bitmap(struct mddev
*mddev
)
935 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
937 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
938 mdname(mddev
), mddev
->pers
->name
);
941 EXPORT_SYMBOL(md_check_no_bitmap
);
944 * load_super for 0.90.0
946 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
948 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
953 * Calculate the position of the superblock (512byte sectors),
954 * it's at the end of the disk.
956 * It also happens to be a multiple of 4Kb.
958 rdev
->sb_start
= calc_dev_sboffset(rdev
);
960 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
965 bdevname(rdev
->bdev
, b
);
966 sb
= page_address(rdev
->sb_page
);
968 if (sb
->md_magic
!= MD_SB_MAGIC
) {
969 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
974 if (sb
->major_version
!= 0 ||
975 sb
->minor_version
< 90 ||
976 sb
->minor_version
> 91) {
977 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
978 sb
->major_version
, sb
->minor_version
,
983 if (sb
->raid_disks
<= 0)
986 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
987 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
992 rdev
->preferred_minor
= sb
->md_minor
;
993 rdev
->data_offset
= 0;
994 rdev
->new_data_offset
= 0;
995 rdev
->sb_size
= MD_SB_BYTES
;
996 rdev
->badblocks
.shift
= -1;
998 if (sb
->level
== LEVEL_MULTIPATH
)
1001 rdev
->desc_nr
= sb
->this_disk
.number
;
1007 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1008 if (!uuid_equal(refsb
, sb
)) {
1009 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1010 b
, bdevname(refdev
->bdev
,b2
));
1013 if (!sb_equal(refsb
, sb
)) {
1014 printk(KERN_WARNING
"md: %s has same UUID"
1015 " but different superblock to %s\n",
1016 b
, bdevname(refdev
->bdev
, b2
));
1020 ev2
= md_event(refsb
);
1026 rdev
->sectors
= rdev
->sb_start
;
1027 /* Limit to 4TB as metadata cannot record more than that.
1028 * (not needed for Linear and RAID0 as metadata doesn't
1031 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1032 rdev
->sectors
= (2ULL << 32) - 2;
1034 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1035 /* "this cannot possibly happen" ... */
1043 * validate_super for 0.90.0
1045 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1048 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1049 __u64 ev1
= md_event(sb
);
1051 rdev
->raid_disk
= -1;
1052 clear_bit(Faulty
, &rdev
->flags
);
1053 clear_bit(In_sync
, &rdev
->flags
);
1054 clear_bit(Bitmap_sync
, &rdev
->flags
);
1055 clear_bit(WriteMostly
, &rdev
->flags
);
1057 if (mddev
->raid_disks
== 0) {
1058 mddev
->major_version
= 0;
1059 mddev
->minor_version
= sb
->minor_version
;
1060 mddev
->patch_version
= sb
->patch_version
;
1061 mddev
->external
= 0;
1062 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1063 mddev
->ctime
= sb
->ctime
;
1064 mddev
->utime
= sb
->utime
;
1065 mddev
->level
= sb
->level
;
1066 mddev
->clevel
[0] = 0;
1067 mddev
->layout
= sb
->layout
;
1068 mddev
->raid_disks
= sb
->raid_disks
;
1069 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1070 mddev
->events
= ev1
;
1071 mddev
->bitmap_info
.offset
= 0;
1072 mddev
->bitmap_info
.space
= 0;
1073 /* bitmap can use 60 K after the 4K superblocks */
1074 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1075 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1076 mddev
->reshape_backwards
= 0;
1078 if (mddev
->minor_version
>= 91) {
1079 mddev
->reshape_position
= sb
->reshape_position
;
1080 mddev
->delta_disks
= sb
->delta_disks
;
1081 mddev
->new_level
= sb
->new_level
;
1082 mddev
->new_layout
= sb
->new_layout
;
1083 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1084 if (mddev
->delta_disks
< 0)
1085 mddev
->reshape_backwards
= 1;
1087 mddev
->reshape_position
= MaxSector
;
1088 mddev
->delta_disks
= 0;
1089 mddev
->new_level
= mddev
->level
;
1090 mddev
->new_layout
= mddev
->layout
;
1091 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1094 if (sb
->state
& (1<<MD_SB_CLEAN
))
1095 mddev
->recovery_cp
= MaxSector
;
1097 if (sb
->events_hi
== sb
->cp_events_hi
&&
1098 sb
->events_lo
== sb
->cp_events_lo
) {
1099 mddev
->recovery_cp
= sb
->recovery_cp
;
1101 mddev
->recovery_cp
= 0;
1104 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1105 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1106 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1107 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1109 mddev
->max_disks
= MD_SB_DISKS
;
1111 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1112 mddev
->bitmap_info
.file
== NULL
) {
1113 mddev
->bitmap_info
.offset
=
1114 mddev
->bitmap_info
.default_offset
;
1115 mddev
->bitmap_info
.space
=
1116 mddev
->bitmap_info
.default_space
;
1119 } else if (mddev
->pers
== NULL
) {
1120 /* Insist on good event counter while assembling, except
1121 * for spares (which don't need an event count) */
1123 if (sb
->disks
[rdev
->desc_nr
].state
& (
1124 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1125 if (ev1
< mddev
->events
)
1127 } else if (mddev
->bitmap
) {
1128 /* if adding to array with a bitmap, then we can accept an
1129 * older device ... but not too old.
1131 if (ev1
< mddev
->bitmap
->events_cleared
)
1133 if (ev1
< mddev
->events
)
1134 set_bit(Bitmap_sync
, &rdev
->flags
);
1136 if (ev1
< mddev
->events
)
1137 /* just a hot-add of a new device, leave raid_disk at -1 */
1141 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1142 desc
= sb
->disks
+ rdev
->desc_nr
;
1144 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1145 set_bit(Faulty
, &rdev
->flags
);
1146 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1147 desc->raid_disk < mddev->raid_disks */) {
1148 set_bit(In_sync
, &rdev
->flags
);
1149 rdev
->raid_disk
= desc
->raid_disk
;
1150 rdev
->saved_raid_disk
= desc
->raid_disk
;
1151 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1152 /* active but not in sync implies recovery up to
1153 * reshape position. We don't know exactly where
1154 * that is, so set to zero for now */
1155 if (mddev
->minor_version
>= 91) {
1156 rdev
->recovery_offset
= 0;
1157 rdev
->raid_disk
= desc
->raid_disk
;
1160 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1161 set_bit(WriteMostly
, &rdev
->flags
);
1162 } else /* MULTIPATH are always insync */
1163 set_bit(In_sync
, &rdev
->flags
);
1168 * sync_super for 0.90.0
1170 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1173 struct md_rdev
*rdev2
;
1174 int next_spare
= mddev
->raid_disks
;
1176 /* make rdev->sb match mddev data..
1179 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1180 * 3/ any empty disks < next_spare become removed
1182 * disks[0] gets initialised to REMOVED because
1183 * we cannot be sure from other fields if it has
1184 * been initialised or not.
1187 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1189 rdev
->sb_size
= MD_SB_BYTES
;
1191 sb
= page_address(rdev
->sb_page
);
1193 memset(sb
, 0, sizeof(*sb
));
1195 sb
->md_magic
= MD_SB_MAGIC
;
1196 sb
->major_version
= mddev
->major_version
;
1197 sb
->patch_version
= mddev
->patch_version
;
1198 sb
->gvalid_words
= 0; /* ignored */
1199 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1200 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1201 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1202 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1204 sb
->ctime
= mddev
->ctime
;
1205 sb
->level
= mddev
->level
;
1206 sb
->size
= mddev
->dev_sectors
/ 2;
1207 sb
->raid_disks
= mddev
->raid_disks
;
1208 sb
->md_minor
= mddev
->md_minor
;
1209 sb
->not_persistent
= 0;
1210 sb
->utime
= mddev
->utime
;
1212 sb
->events_hi
= (mddev
->events
>>32);
1213 sb
->events_lo
= (u32
)mddev
->events
;
1215 if (mddev
->reshape_position
== MaxSector
)
1216 sb
->minor_version
= 90;
1218 sb
->minor_version
= 91;
1219 sb
->reshape_position
= mddev
->reshape_position
;
1220 sb
->new_level
= mddev
->new_level
;
1221 sb
->delta_disks
= mddev
->delta_disks
;
1222 sb
->new_layout
= mddev
->new_layout
;
1223 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1225 mddev
->minor_version
= sb
->minor_version
;
1228 sb
->recovery_cp
= mddev
->recovery_cp
;
1229 sb
->cp_events_hi
= (mddev
->events
>>32);
1230 sb
->cp_events_lo
= (u32
)mddev
->events
;
1231 if (mddev
->recovery_cp
== MaxSector
)
1232 sb
->state
= (1<< MD_SB_CLEAN
);
1234 sb
->recovery_cp
= 0;
1236 sb
->layout
= mddev
->layout
;
1237 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1239 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1240 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1242 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1243 rdev_for_each(rdev2
, mddev
) {
1246 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1248 if (rdev2
->raid_disk
>= 0 &&
1249 sb
->minor_version
>= 91)
1250 /* we have nowhere to store the recovery_offset,
1251 * but if it is not below the reshape_position,
1252 * we can piggy-back on that.
1255 if (rdev2
->raid_disk
< 0 ||
1256 test_bit(Faulty
, &rdev2
->flags
))
1259 desc_nr
= rdev2
->raid_disk
;
1261 desc_nr
= next_spare
++;
1262 rdev2
->desc_nr
= desc_nr
;
1263 d
= &sb
->disks
[rdev2
->desc_nr
];
1265 d
->number
= rdev2
->desc_nr
;
1266 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1267 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1269 d
->raid_disk
= rdev2
->raid_disk
;
1271 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1272 if (test_bit(Faulty
, &rdev2
->flags
))
1273 d
->state
= (1<<MD_DISK_FAULTY
);
1274 else if (is_active
) {
1275 d
->state
= (1<<MD_DISK_ACTIVE
);
1276 if (test_bit(In_sync
, &rdev2
->flags
))
1277 d
->state
|= (1<<MD_DISK_SYNC
);
1285 if (test_bit(WriteMostly
, &rdev2
->flags
))
1286 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1288 /* now set the "removed" and "faulty" bits on any missing devices */
1289 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1290 mdp_disk_t
*d
= &sb
->disks
[i
];
1291 if (d
->state
== 0 && d
->number
== 0) {
1294 d
->state
= (1<<MD_DISK_REMOVED
);
1295 d
->state
|= (1<<MD_DISK_FAULTY
);
1299 sb
->nr_disks
= nr_disks
;
1300 sb
->active_disks
= active
;
1301 sb
->working_disks
= working
;
1302 sb
->failed_disks
= failed
;
1303 sb
->spare_disks
= spare
;
1305 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1306 sb
->sb_csum
= calc_sb_csum(sb
);
1310 * rdev_size_change for 0.90.0
1312 static unsigned long long
1313 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1315 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1316 return 0; /* component must fit device */
1317 if (rdev
->mddev
->bitmap_info
.offset
)
1318 return 0; /* can't move bitmap */
1319 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1320 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1321 num_sectors
= rdev
->sb_start
;
1322 /* Limit to 4TB as metadata cannot record more than that.
1323 * 4TB == 2^32 KB, or 2*2^32 sectors.
1325 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1326 num_sectors
= (2ULL << 32) - 2;
1327 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1329 md_super_wait(rdev
->mddev
);
1334 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1336 /* non-zero offset changes not possible with v0.90 */
1337 return new_offset
== 0;
1341 * version 1 superblock
1344 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1348 unsigned long long newcsum
;
1349 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1350 __le32
*isuper
= (__le32
*)sb
;
1352 disk_csum
= sb
->sb_csum
;
1355 for (; size
>= 4; size
-= 4)
1356 newcsum
+= le32_to_cpu(*isuper
++);
1359 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1361 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1362 sb
->sb_csum
= disk_csum
;
1363 return cpu_to_le32(csum
);
1366 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1368 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1370 struct mdp_superblock_1
*sb
;
1374 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1378 * Calculate the position of the superblock in 512byte sectors.
1379 * It is always aligned to a 4K boundary and
1380 * depeding on minor_version, it can be:
1381 * 0: At least 8K, but less than 12K, from end of device
1382 * 1: At start of device
1383 * 2: 4K from start of device.
1385 switch(minor_version
) {
1387 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1389 sb_start
&= ~(sector_t
)(4*2-1);
1400 rdev
->sb_start
= sb_start
;
1402 /* superblock is rarely larger than 1K, but it can be larger,
1403 * and it is safe to read 4k, so we do that
1405 ret
= read_disk_sb(rdev
, 4096);
1406 if (ret
) return ret
;
1408 sb
= page_address(rdev
->sb_page
);
1410 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1411 sb
->major_version
!= cpu_to_le32(1) ||
1412 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1413 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1414 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1417 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1418 printk("md: invalid superblock checksum on %s\n",
1419 bdevname(rdev
->bdev
,b
));
1422 if (le64_to_cpu(sb
->data_size
) < 10) {
1423 printk("md: data_size too small on %s\n",
1424 bdevname(rdev
->bdev
,b
));
1429 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1430 /* Some padding is non-zero, might be a new feature */
1433 rdev
->preferred_minor
= 0xffff;
1434 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1435 rdev
->new_data_offset
= rdev
->data_offset
;
1436 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1437 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1438 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1439 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1441 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1442 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1443 if (rdev
->sb_size
& bmask
)
1444 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1447 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1450 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1453 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1456 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1458 if (!rdev
->bb_page
) {
1459 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1463 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1464 rdev
->badblocks
.count
== 0) {
1465 /* need to load the bad block list.
1466 * Currently we limit it to one page.
1472 int sectors
= le16_to_cpu(sb
->bblog_size
);
1473 if (sectors
> (PAGE_SIZE
/ 512))
1475 offset
= le32_to_cpu(sb
->bblog_offset
);
1478 bb_sector
= (long long)offset
;
1479 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1480 rdev
->bb_page
, READ
, true))
1482 bbp
= (u64
*)page_address(rdev
->bb_page
);
1483 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1484 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1485 u64 bb
= le64_to_cpu(*bbp
);
1486 int count
= bb
& (0x3ff);
1487 u64 sector
= bb
>> 10;
1488 sector
<<= sb
->bblog_shift
;
1489 count
<<= sb
->bblog_shift
;
1492 if (md_set_badblocks(&rdev
->badblocks
,
1493 sector
, count
, 1) == 0)
1496 } else if (sb
->bblog_offset
!= 0)
1497 rdev
->badblocks
.shift
= 0;
1503 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1505 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1506 sb
->level
!= refsb
->level
||
1507 sb
->layout
!= refsb
->layout
||
1508 sb
->chunksize
!= refsb
->chunksize
) {
1509 printk(KERN_WARNING
"md: %s has strangely different"
1510 " superblock to %s\n",
1511 bdevname(rdev
->bdev
,b
),
1512 bdevname(refdev
->bdev
,b2
));
1515 ev1
= le64_to_cpu(sb
->events
);
1516 ev2
= le64_to_cpu(refsb
->events
);
1523 if (minor_version
) {
1524 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1525 sectors
-= rdev
->data_offset
;
1527 sectors
= rdev
->sb_start
;
1528 if (sectors
< le64_to_cpu(sb
->data_size
))
1530 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1534 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1536 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1537 __u64 ev1
= le64_to_cpu(sb
->events
);
1539 rdev
->raid_disk
= -1;
1540 clear_bit(Faulty
, &rdev
->flags
);
1541 clear_bit(In_sync
, &rdev
->flags
);
1542 clear_bit(Bitmap_sync
, &rdev
->flags
);
1543 clear_bit(WriteMostly
, &rdev
->flags
);
1545 if (mddev
->raid_disks
== 0) {
1546 mddev
->major_version
= 1;
1547 mddev
->patch_version
= 0;
1548 mddev
->external
= 0;
1549 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1550 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1551 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1552 mddev
->level
= le32_to_cpu(sb
->level
);
1553 mddev
->clevel
[0] = 0;
1554 mddev
->layout
= le32_to_cpu(sb
->layout
);
1555 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1556 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1557 mddev
->events
= ev1
;
1558 mddev
->bitmap_info
.offset
= 0;
1559 mddev
->bitmap_info
.space
= 0;
1560 /* Default location for bitmap is 1K after superblock
1561 * using 3K - total of 4K
1563 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1564 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1565 mddev
->reshape_backwards
= 0;
1567 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1568 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1570 mddev
->max_disks
= (4096-256)/2;
1572 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1573 mddev
->bitmap_info
.file
== NULL
) {
1574 mddev
->bitmap_info
.offset
=
1575 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1576 /* Metadata doesn't record how much space is available.
1577 * For 1.0, we assume we can use up to the superblock
1578 * if before, else to 4K beyond superblock.
1579 * For others, assume no change is possible.
1581 if (mddev
->minor_version
> 0)
1582 mddev
->bitmap_info
.space
= 0;
1583 else if (mddev
->bitmap_info
.offset
> 0)
1584 mddev
->bitmap_info
.space
=
1585 8 - mddev
->bitmap_info
.offset
;
1587 mddev
->bitmap_info
.space
=
1588 -mddev
->bitmap_info
.offset
;
1591 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1592 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1593 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1594 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1595 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1596 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1597 if (mddev
->delta_disks
< 0 ||
1598 (mddev
->delta_disks
== 0 &&
1599 (le32_to_cpu(sb
->feature_map
)
1600 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1601 mddev
->reshape_backwards
= 1;
1603 mddev
->reshape_position
= MaxSector
;
1604 mddev
->delta_disks
= 0;
1605 mddev
->new_level
= mddev
->level
;
1606 mddev
->new_layout
= mddev
->layout
;
1607 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1610 } else if (mddev
->pers
== NULL
) {
1611 /* Insist of good event counter while assembling, except for
1612 * spares (which don't need an event count) */
1614 if (rdev
->desc_nr
>= 0 &&
1615 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1616 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1617 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1618 if (ev1
< mddev
->events
)
1620 } else if (mddev
->bitmap
) {
1621 /* If adding to array with a bitmap, then we can accept an
1622 * older device, but not too old.
1624 if (ev1
< mddev
->bitmap
->events_cleared
)
1626 if (ev1
< mddev
->events
)
1627 set_bit(Bitmap_sync
, &rdev
->flags
);
1629 if (ev1
< mddev
->events
)
1630 /* just a hot-add of a new device, leave raid_disk at -1 */
1633 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1635 if (rdev
->desc_nr
< 0 ||
1636 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1637 role
= MD_DISK_ROLE_SPARE
;
1640 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1642 case MD_DISK_ROLE_SPARE
: /* spare */
1644 case MD_DISK_ROLE_FAULTY
: /* faulty */
1645 set_bit(Faulty
, &rdev
->flags
);
1647 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1648 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1649 /* journal device without journal feature */
1651 "md: journal device provided without journal feature, ignoring the device\n");
1654 set_bit(Journal
, &rdev
->flags
);
1655 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1656 if (mddev
->recovery_cp
== MaxSector
)
1657 set_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
);
1658 rdev
->raid_disk
= 0;
1661 rdev
->saved_raid_disk
= role
;
1662 if ((le32_to_cpu(sb
->feature_map
) &
1663 MD_FEATURE_RECOVERY_OFFSET
)) {
1664 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1665 if (!(le32_to_cpu(sb
->feature_map
) &
1666 MD_FEATURE_RECOVERY_BITMAP
))
1667 rdev
->saved_raid_disk
= -1;
1669 set_bit(In_sync
, &rdev
->flags
);
1670 rdev
->raid_disk
= role
;
1673 if (sb
->devflags
& WriteMostly1
)
1674 set_bit(WriteMostly
, &rdev
->flags
);
1675 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1676 set_bit(Replacement
, &rdev
->flags
);
1677 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1678 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1679 } else /* MULTIPATH are always insync */
1680 set_bit(In_sync
, &rdev
->flags
);
1685 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1687 struct mdp_superblock_1
*sb
;
1688 struct md_rdev
*rdev2
;
1690 /* make rdev->sb match mddev and rdev data. */
1692 sb
= page_address(rdev
->sb_page
);
1694 sb
->feature_map
= 0;
1696 sb
->recovery_offset
= cpu_to_le64(0);
1697 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1699 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1700 sb
->events
= cpu_to_le64(mddev
->events
);
1702 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1703 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1704 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1706 sb
->resync_offset
= cpu_to_le64(0);
1708 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1710 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1711 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1712 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1713 sb
->level
= cpu_to_le32(mddev
->level
);
1714 sb
->layout
= cpu_to_le32(mddev
->layout
);
1716 if (test_bit(WriteMostly
, &rdev
->flags
))
1717 sb
->devflags
|= WriteMostly1
;
1719 sb
->devflags
&= ~WriteMostly1
;
1720 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1721 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1723 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1724 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1725 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1728 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1729 !test_bit(In_sync
, &rdev
->flags
)) {
1731 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1732 sb
->recovery_offset
=
1733 cpu_to_le64(rdev
->recovery_offset
);
1734 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1736 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1738 /* Note: recovery_offset and journal_tail share space */
1739 if (test_bit(Journal
, &rdev
->flags
))
1740 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1741 if (test_bit(Replacement
, &rdev
->flags
))
1743 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1745 if (mddev
->reshape_position
!= MaxSector
) {
1746 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1747 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1748 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1749 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1750 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1751 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1752 if (mddev
->delta_disks
== 0 &&
1753 mddev
->reshape_backwards
)
1755 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1756 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1758 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1759 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1760 - rdev
->data_offset
));
1764 if (mddev_is_clustered(mddev
))
1765 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1767 if (rdev
->badblocks
.count
== 0)
1768 /* Nothing to do for bad blocks*/ ;
1769 else if (sb
->bblog_offset
== 0)
1770 /* Cannot record bad blocks on this device */
1771 md_error(mddev
, rdev
);
1773 struct badblocks
*bb
= &rdev
->badblocks
;
1774 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1776 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1781 seq
= read_seqbegin(&bb
->lock
);
1783 memset(bbp
, 0xff, PAGE_SIZE
);
1785 for (i
= 0 ; i
< bb
->count
; i
++) {
1786 u64 internal_bb
= p
[i
];
1787 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1788 | BB_LEN(internal_bb
));
1789 bbp
[i
] = cpu_to_le64(store_bb
);
1792 if (read_seqretry(&bb
->lock
, seq
))
1795 bb
->sector
= (rdev
->sb_start
+
1796 (int)le32_to_cpu(sb
->bblog_offset
));
1797 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1802 rdev_for_each(rdev2
, mddev
)
1803 if (rdev2
->desc_nr
+1 > max_dev
)
1804 max_dev
= rdev2
->desc_nr
+1;
1806 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1808 sb
->max_dev
= cpu_to_le32(max_dev
);
1809 rdev
->sb_size
= max_dev
* 2 + 256;
1810 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1811 if (rdev
->sb_size
& bmask
)
1812 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1814 max_dev
= le32_to_cpu(sb
->max_dev
);
1816 for (i
=0; i
<max_dev
;i
++)
1817 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1819 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1820 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1822 rdev_for_each(rdev2
, mddev
) {
1824 if (test_bit(Faulty
, &rdev2
->flags
))
1825 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1826 else if (test_bit(In_sync
, &rdev2
->flags
))
1827 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1828 else if (test_bit(Journal
, &rdev2
->flags
))
1829 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1830 else if (rdev2
->raid_disk
>= 0)
1831 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1833 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1836 sb
->sb_csum
= calc_sb_1_csum(sb
);
1839 static unsigned long long
1840 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1842 struct mdp_superblock_1
*sb
;
1843 sector_t max_sectors
;
1844 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1845 return 0; /* component must fit device */
1846 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1847 return 0; /* too confusing */
1848 if (rdev
->sb_start
< rdev
->data_offset
) {
1849 /* minor versions 1 and 2; superblock before data */
1850 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1851 max_sectors
-= rdev
->data_offset
;
1852 if (!num_sectors
|| num_sectors
> max_sectors
)
1853 num_sectors
= max_sectors
;
1854 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1855 /* minor version 0 with bitmap we can't move */
1858 /* minor version 0; superblock after data */
1860 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1861 sb_start
&= ~(sector_t
)(4*2 - 1);
1862 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1863 if (!num_sectors
|| num_sectors
> max_sectors
)
1864 num_sectors
= max_sectors
;
1865 rdev
->sb_start
= sb_start
;
1867 sb
= page_address(rdev
->sb_page
);
1868 sb
->data_size
= cpu_to_le64(num_sectors
);
1869 sb
->super_offset
= rdev
->sb_start
;
1870 sb
->sb_csum
= calc_sb_1_csum(sb
);
1871 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1873 md_super_wait(rdev
->mddev
);
1879 super_1_allow_new_offset(struct md_rdev
*rdev
,
1880 unsigned long long new_offset
)
1882 /* All necessary checks on new >= old have been done */
1883 struct bitmap
*bitmap
;
1884 if (new_offset
>= rdev
->data_offset
)
1887 /* with 1.0 metadata, there is no metadata to tread on
1888 * so we can always move back */
1889 if (rdev
->mddev
->minor_version
== 0)
1892 /* otherwise we must be sure not to step on
1893 * any metadata, so stay:
1894 * 36K beyond start of superblock
1895 * beyond end of badblocks
1896 * beyond write-intent bitmap
1898 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1900 bitmap
= rdev
->mddev
->bitmap
;
1901 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1902 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1903 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1905 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1911 static struct super_type super_types
[] = {
1914 .owner
= THIS_MODULE
,
1915 .load_super
= super_90_load
,
1916 .validate_super
= super_90_validate
,
1917 .sync_super
= super_90_sync
,
1918 .rdev_size_change
= super_90_rdev_size_change
,
1919 .allow_new_offset
= super_90_allow_new_offset
,
1923 .owner
= THIS_MODULE
,
1924 .load_super
= super_1_load
,
1925 .validate_super
= super_1_validate
,
1926 .sync_super
= super_1_sync
,
1927 .rdev_size_change
= super_1_rdev_size_change
,
1928 .allow_new_offset
= super_1_allow_new_offset
,
1932 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1934 if (mddev
->sync_super
) {
1935 mddev
->sync_super(mddev
, rdev
);
1939 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1941 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1944 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1946 struct md_rdev
*rdev
, *rdev2
;
1949 rdev_for_each_rcu(rdev
, mddev1
) {
1950 if (test_bit(Faulty
, &rdev
->flags
) ||
1951 test_bit(Journal
, &rdev
->flags
) ||
1952 rdev
->raid_disk
== -1)
1954 rdev_for_each_rcu(rdev2
, mddev2
) {
1955 if (test_bit(Faulty
, &rdev2
->flags
) ||
1956 test_bit(Journal
, &rdev2
->flags
) ||
1957 rdev2
->raid_disk
== -1)
1959 if (rdev
->bdev
->bd_contains
==
1960 rdev2
->bdev
->bd_contains
) {
1970 static LIST_HEAD(pending_raid_disks
);
1973 * Try to register data integrity profile for an mddev
1975 * This is called when an array is started and after a disk has been kicked
1976 * from the array. It only succeeds if all working and active component devices
1977 * are integrity capable with matching profiles.
1979 int md_integrity_register(struct mddev
*mddev
)
1981 struct md_rdev
*rdev
, *reference
= NULL
;
1983 if (list_empty(&mddev
->disks
))
1984 return 0; /* nothing to do */
1985 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1986 return 0; /* shouldn't register, or already is */
1987 rdev_for_each(rdev
, mddev
) {
1988 /* skip spares and non-functional disks */
1989 if (test_bit(Faulty
, &rdev
->flags
))
1991 if (rdev
->raid_disk
< 0)
1994 /* Use the first rdev as the reference */
1998 /* does this rdev's profile match the reference profile? */
1999 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2000 rdev
->bdev
->bd_disk
) < 0)
2003 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2006 * All component devices are integrity capable and have matching
2007 * profiles, register the common profile for the md device.
2009 blk_integrity_register(mddev
->gendisk
,
2010 bdev_get_integrity(reference
->bdev
));
2012 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2013 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2014 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2020 EXPORT_SYMBOL(md_integrity_register
);
2023 * Attempt to add an rdev, but only if it is consistent with the current
2026 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2028 struct blk_integrity
*bi_rdev
;
2029 struct blk_integrity
*bi_mddev
;
2030 char name
[BDEVNAME_SIZE
];
2032 if (!mddev
->gendisk
)
2035 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2036 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2038 if (!bi_mddev
) /* nothing to do */
2041 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2042 printk(KERN_NOTICE
"%s: incompatible integrity profile for %s\n",
2043 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2049 EXPORT_SYMBOL(md_integrity_add_rdev
);
2051 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2053 char b
[BDEVNAME_SIZE
];
2057 /* prevent duplicates */
2058 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2061 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2062 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2063 rdev
->sectors
< mddev
->dev_sectors
)) {
2065 /* Cannot change size, so fail
2066 * If mddev->level <= 0, then we don't care
2067 * about aligning sizes (e.g. linear)
2069 if (mddev
->level
> 0)
2072 mddev
->dev_sectors
= rdev
->sectors
;
2075 /* Verify rdev->desc_nr is unique.
2076 * If it is -1, assign a free number, else
2077 * check number is not in use
2080 if (rdev
->desc_nr
< 0) {
2083 choice
= mddev
->raid_disks
;
2084 while (md_find_rdev_nr_rcu(mddev
, choice
))
2086 rdev
->desc_nr
= choice
;
2088 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2094 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2095 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2096 mdname(mddev
), mddev
->max_disks
);
2099 bdevname(rdev
->bdev
,b
);
2100 strreplace(b
, '/', '!');
2102 rdev
->mddev
= mddev
;
2103 printk(KERN_INFO
"md: bind<%s>\n", b
);
2105 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2108 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2109 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2110 /* failure here is OK */;
2111 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2113 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2114 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2116 /* May as well allow recovery to be retried once */
2117 mddev
->recovery_disabled
++;
2122 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2127 static void md_delayed_delete(struct work_struct
*ws
)
2129 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2130 kobject_del(&rdev
->kobj
);
2131 kobject_put(&rdev
->kobj
);
2134 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2136 char b
[BDEVNAME_SIZE
];
2138 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2139 list_del_rcu(&rdev
->same_set
);
2140 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2142 sysfs_remove_link(&rdev
->kobj
, "block");
2143 sysfs_put(rdev
->sysfs_state
);
2144 rdev
->sysfs_state
= NULL
;
2145 rdev
->badblocks
.count
= 0;
2146 /* We need to delay this, otherwise we can deadlock when
2147 * writing to 'remove' to "dev/state". We also need
2148 * to delay it due to rcu usage.
2151 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2152 kobject_get(&rdev
->kobj
);
2153 queue_work(md_misc_wq
, &rdev
->del_work
);
2157 * prevent the device from being mounted, repartitioned or
2158 * otherwise reused by a RAID array (or any other kernel
2159 * subsystem), by bd_claiming the device.
2161 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2164 struct block_device
*bdev
;
2165 char b
[BDEVNAME_SIZE
];
2167 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2168 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2170 printk(KERN_ERR
"md: could not open %s.\n",
2171 __bdevname(dev
, b
));
2172 return PTR_ERR(bdev
);
2178 static void unlock_rdev(struct md_rdev
*rdev
)
2180 struct block_device
*bdev
= rdev
->bdev
;
2182 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2185 void md_autodetect_dev(dev_t dev
);
2187 static void export_rdev(struct md_rdev
*rdev
)
2189 char b
[BDEVNAME_SIZE
];
2191 printk(KERN_INFO
"md: export_rdev(%s)\n",
2192 bdevname(rdev
->bdev
,b
));
2193 md_rdev_clear(rdev
);
2195 if (test_bit(AutoDetected
, &rdev
->flags
))
2196 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2199 kobject_put(&rdev
->kobj
);
2202 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2204 unbind_rdev_from_array(rdev
);
2207 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2209 static void export_array(struct mddev
*mddev
)
2211 struct md_rdev
*rdev
;
2213 while (!list_empty(&mddev
->disks
)) {
2214 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2216 md_kick_rdev_from_array(rdev
);
2218 mddev
->raid_disks
= 0;
2219 mddev
->major_version
= 0;
2222 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2224 /* Update each superblock (in-memory image), but
2225 * if we are allowed to, skip spares which already
2226 * have the right event counter, or have one earlier
2227 * (which would mean they aren't being marked as dirty
2228 * with the rest of the array)
2230 struct md_rdev
*rdev
;
2231 rdev_for_each(rdev
, mddev
) {
2232 if (rdev
->sb_events
== mddev
->events
||
2234 rdev
->raid_disk
< 0 &&
2235 rdev
->sb_events
+1 == mddev
->events
)) {
2236 /* Don't update this superblock */
2237 rdev
->sb_loaded
= 2;
2239 sync_super(mddev
, rdev
);
2240 rdev
->sb_loaded
= 1;
2245 static bool does_sb_need_changing(struct mddev
*mddev
)
2247 struct md_rdev
*rdev
;
2248 struct mdp_superblock_1
*sb
;
2251 /* Find a good rdev */
2252 rdev_for_each(rdev
, mddev
)
2253 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2256 /* No good device found. */
2260 sb
= page_address(rdev
->sb_page
);
2261 /* Check if a device has become faulty or a spare become active */
2262 rdev_for_each(rdev
, mddev
) {
2263 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2264 /* Device activated? */
2265 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2266 !test_bit(Faulty
, &rdev
->flags
))
2268 /* Device turned faulty? */
2269 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2273 /* Check if any mddev parameters have changed */
2274 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2275 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2276 (mddev
->layout
!= le32_to_cpu(sb
->layout
)) ||
2277 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2278 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2284 void md_update_sb(struct mddev
*mddev
, int force_change
)
2286 struct md_rdev
*rdev
;
2289 int any_badblocks_changed
= 0;
2294 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2298 if (mddev_is_clustered(mddev
)) {
2299 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2301 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2302 /* Has someone else has updated the sb */
2303 if (!does_sb_need_changing(mddev
)) {
2305 md_cluster_ops
->metadata_update_cancel(mddev
);
2306 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2311 /* First make sure individual recovery_offsets are correct */
2312 rdev_for_each(rdev
, mddev
) {
2313 if (rdev
->raid_disk
>= 0 &&
2314 mddev
->delta_disks
>= 0 &&
2315 !test_bit(Journal
, &rdev
->flags
) &&
2316 !test_bit(In_sync
, &rdev
->flags
) &&
2317 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2318 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2321 if (!mddev
->persistent
) {
2322 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2323 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2324 if (!mddev
->external
) {
2325 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2326 rdev_for_each(rdev
, mddev
) {
2327 if (rdev
->badblocks
.changed
) {
2328 rdev
->badblocks
.changed
= 0;
2329 md_ack_all_badblocks(&rdev
->badblocks
);
2330 md_error(mddev
, rdev
);
2332 clear_bit(Blocked
, &rdev
->flags
);
2333 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2334 wake_up(&rdev
->blocked_wait
);
2337 wake_up(&mddev
->sb_wait
);
2341 spin_lock(&mddev
->lock
);
2343 mddev
->utime
= get_seconds();
2345 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2347 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2348 /* just a clean<-> dirty transition, possibly leave spares alone,
2349 * though if events isn't the right even/odd, we will have to do
2355 if (mddev
->degraded
)
2356 /* If the array is degraded, then skipping spares is both
2357 * dangerous and fairly pointless.
2358 * Dangerous because a device that was removed from the array
2359 * might have a event_count that still looks up-to-date,
2360 * so it can be re-added without a resync.
2361 * Pointless because if there are any spares to skip,
2362 * then a recovery will happen and soon that array won't
2363 * be degraded any more and the spare can go back to sleep then.
2367 sync_req
= mddev
->in_sync
;
2369 /* If this is just a dirty<->clean transition, and the array is clean
2370 * and 'events' is odd, we can roll back to the previous clean state */
2372 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2373 && mddev
->can_decrease_events
2374 && mddev
->events
!= 1) {
2376 mddev
->can_decrease_events
= 0;
2378 /* otherwise we have to go forward and ... */
2380 mddev
->can_decrease_events
= nospares
;
2384 * This 64-bit counter should never wrap.
2385 * Either we are in around ~1 trillion A.C., assuming
2386 * 1 reboot per second, or we have a bug...
2388 WARN_ON(mddev
->events
== 0);
2390 rdev_for_each(rdev
, mddev
) {
2391 if (rdev
->badblocks
.changed
)
2392 any_badblocks_changed
++;
2393 if (test_bit(Faulty
, &rdev
->flags
))
2394 set_bit(FaultRecorded
, &rdev
->flags
);
2397 sync_sbs(mddev
, nospares
);
2398 spin_unlock(&mddev
->lock
);
2400 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2401 mdname(mddev
), mddev
->in_sync
);
2403 bitmap_update_sb(mddev
->bitmap
);
2404 rdev_for_each(rdev
, mddev
) {
2405 char b
[BDEVNAME_SIZE
];
2407 if (rdev
->sb_loaded
!= 1)
2408 continue; /* no noise on spare devices */
2410 if (!test_bit(Faulty
, &rdev
->flags
)) {
2411 md_super_write(mddev
,rdev
,
2412 rdev
->sb_start
, rdev
->sb_size
,
2414 pr_debug("md: (write) %s's sb offset: %llu\n",
2415 bdevname(rdev
->bdev
, b
),
2416 (unsigned long long)rdev
->sb_start
);
2417 rdev
->sb_events
= mddev
->events
;
2418 if (rdev
->badblocks
.size
) {
2419 md_super_write(mddev
, rdev
,
2420 rdev
->badblocks
.sector
,
2421 rdev
->badblocks
.size
<< 9,
2423 rdev
->badblocks
.size
= 0;
2427 pr_debug("md: %s (skipping faulty)\n",
2428 bdevname(rdev
->bdev
, b
));
2430 if (mddev
->level
== LEVEL_MULTIPATH
)
2431 /* only need to write one superblock... */
2434 md_super_wait(mddev
);
2435 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2437 spin_lock(&mddev
->lock
);
2438 if (mddev
->in_sync
!= sync_req
||
2439 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2440 /* have to write it out again */
2441 spin_unlock(&mddev
->lock
);
2444 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2445 spin_unlock(&mddev
->lock
);
2446 wake_up(&mddev
->sb_wait
);
2447 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2448 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2450 rdev_for_each(rdev
, mddev
) {
2451 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2452 clear_bit(Blocked
, &rdev
->flags
);
2454 if (any_badblocks_changed
)
2455 md_ack_all_badblocks(&rdev
->badblocks
);
2456 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2457 wake_up(&rdev
->blocked_wait
);
2460 if (mddev_is_clustered(mddev
) && ret
== 0)
2461 md_cluster_ops
->metadata_update_finish(mddev
);
2463 EXPORT_SYMBOL(md_update_sb
);
2465 static int add_bound_rdev(struct md_rdev
*rdev
)
2467 struct mddev
*mddev
= rdev
->mddev
;
2470 if (!mddev
->pers
->hot_remove_disk
) {
2471 /* If there is hot_add_disk but no hot_remove_disk
2472 * then added disks for geometry changes,
2473 * and should be added immediately.
2475 super_types
[mddev
->major_version
].
2476 validate_super(mddev
, rdev
);
2477 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2479 unbind_rdev_from_array(rdev
);
2484 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2486 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2487 if (mddev
->degraded
)
2488 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2489 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2490 md_new_event(mddev
);
2491 md_wakeup_thread(mddev
->thread
);
2495 /* words written to sysfs files may, or may not, be \n terminated.
2496 * We want to accept with case. For this we use cmd_match.
2498 static int cmd_match(const char *cmd
, const char *str
)
2500 /* See if cmd, written into a sysfs file, matches
2501 * str. They must either be the same, or cmd can
2502 * have a trailing newline
2504 while (*cmd
&& *str
&& *cmd
== *str
) {
2515 struct rdev_sysfs_entry
{
2516 struct attribute attr
;
2517 ssize_t (*show
)(struct md_rdev
*, char *);
2518 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2522 state_show(struct md_rdev
*rdev
, char *page
)
2526 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2528 if (test_bit(Faulty
, &flags
) ||
2529 rdev
->badblocks
.unacked_exist
) {
2530 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2533 if (test_bit(In_sync
, &flags
)) {
2534 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2537 if (test_bit(Journal
, &flags
)) {
2538 len
+= sprintf(page
+len
, "%sjournal",sep
);
2541 if (test_bit(WriteMostly
, &flags
)) {
2542 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2545 if (test_bit(Blocked
, &flags
) ||
2546 (rdev
->badblocks
.unacked_exist
2547 && !test_bit(Faulty
, &flags
))) {
2548 len
+= sprintf(page
+len
, "%sblocked", sep
);
2551 if (!test_bit(Faulty
, &flags
) &&
2552 !test_bit(Journal
, &flags
) &&
2553 !test_bit(In_sync
, &flags
)) {
2554 len
+= sprintf(page
+len
, "%sspare", sep
);
2557 if (test_bit(WriteErrorSeen
, &flags
)) {
2558 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2561 if (test_bit(WantReplacement
, &flags
)) {
2562 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2565 if (test_bit(Replacement
, &flags
)) {
2566 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2570 return len
+sprintf(page
+len
, "\n");
2574 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2577 * faulty - simulates an error
2578 * remove - disconnects the device
2579 * writemostly - sets write_mostly
2580 * -writemostly - clears write_mostly
2581 * blocked - sets the Blocked flags
2582 * -blocked - clears the Blocked and possibly simulates an error
2583 * insync - sets Insync providing device isn't active
2584 * -insync - clear Insync for a device with a slot assigned,
2585 * so that it gets rebuilt based on bitmap
2586 * write_error - sets WriteErrorSeen
2587 * -write_error - clears WriteErrorSeen
2590 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2591 md_error(rdev
->mddev
, rdev
);
2592 if (test_bit(Faulty
, &rdev
->flags
))
2596 } else if (cmd_match(buf
, "remove")) {
2597 if (rdev
->raid_disk
>= 0)
2600 struct mddev
*mddev
= rdev
->mddev
;
2602 if (mddev_is_clustered(mddev
))
2603 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2606 md_kick_rdev_from_array(rdev
);
2608 md_update_sb(mddev
, 1);
2609 md_new_event(mddev
);
2612 } else if (cmd_match(buf
, "writemostly")) {
2613 set_bit(WriteMostly
, &rdev
->flags
);
2615 } else if (cmd_match(buf
, "-writemostly")) {
2616 clear_bit(WriteMostly
, &rdev
->flags
);
2618 } else if (cmd_match(buf
, "blocked")) {
2619 set_bit(Blocked
, &rdev
->flags
);
2621 } else if (cmd_match(buf
, "-blocked")) {
2622 if (!test_bit(Faulty
, &rdev
->flags
) &&
2623 rdev
->badblocks
.unacked_exist
) {
2624 /* metadata handler doesn't understand badblocks,
2625 * so we need to fail the device
2627 md_error(rdev
->mddev
, rdev
);
2629 clear_bit(Blocked
, &rdev
->flags
);
2630 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2631 wake_up(&rdev
->blocked_wait
);
2632 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2633 md_wakeup_thread(rdev
->mddev
->thread
);
2636 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2637 set_bit(In_sync
, &rdev
->flags
);
2639 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2640 !test_bit(Journal
, &rdev
->flags
)) {
2641 if (rdev
->mddev
->pers
== NULL
) {
2642 clear_bit(In_sync
, &rdev
->flags
);
2643 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2644 rdev
->raid_disk
= -1;
2647 } else if (cmd_match(buf
, "write_error")) {
2648 set_bit(WriteErrorSeen
, &rdev
->flags
);
2650 } else if (cmd_match(buf
, "-write_error")) {
2651 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2653 } else if (cmd_match(buf
, "want_replacement")) {
2654 /* Any non-spare device that is not a replacement can
2655 * become want_replacement at any time, but we then need to
2656 * check if recovery is needed.
2658 if (rdev
->raid_disk
>= 0 &&
2659 !test_bit(Journal
, &rdev
->flags
) &&
2660 !test_bit(Replacement
, &rdev
->flags
))
2661 set_bit(WantReplacement
, &rdev
->flags
);
2662 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2663 md_wakeup_thread(rdev
->mddev
->thread
);
2665 } else if (cmd_match(buf
, "-want_replacement")) {
2666 /* Clearing 'want_replacement' is always allowed.
2667 * Once replacements starts it is too late though.
2670 clear_bit(WantReplacement
, &rdev
->flags
);
2671 } else if (cmd_match(buf
, "replacement")) {
2672 /* Can only set a device as a replacement when array has not
2673 * yet been started. Once running, replacement is automatic
2674 * from spares, or by assigning 'slot'.
2676 if (rdev
->mddev
->pers
)
2679 set_bit(Replacement
, &rdev
->flags
);
2682 } else if (cmd_match(buf
, "-replacement")) {
2683 /* Similarly, can only clear Replacement before start */
2684 if (rdev
->mddev
->pers
)
2687 clear_bit(Replacement
, &rdev
->flags
);
2690 } else if (cmd_match(buf
, "re-add")) {
2691 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2692 /* clear_bit is performed _after_ all the devices
2693 * have their local Faulty bit cleared. If any writes
2694 * happen in the meantime in the local node, they
2695 * will land in the local bitmap, which will be synced
2696 * by this node eventually
2698 if (!mddev_is_clustered(rdev
->mddev
) ||
2699 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2700 clear_bit(Faulty
, &rdev
->flags
);
2701 err
= add_bound_rdev(rdev
);
2707 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2708 return err
? err
: len
;
2710 static struct rdev_sysfs_entry rdev_state
=
2711 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2714 errors_show(struct md_rdev
*rdev
, char *page
)
2716 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2720 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2725 rv
= kstrtouint(buf
, 10, &n
);
2728 atomic_set(&rdev
->corrected_errors
, n
);
2731 static struct rdev_sysfs_entry rdev_errors
=
2732 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2735 slot_show(struct md_rdev
*rdev
, char *page
)
2737 if (test_bit(Journal
, &rdev
->flags
))
2738 return sprintf(page
, "journal\n");
2739 else if (rdev
->raid_disk
< 0)
2740 return sprintf(page
, "none\n");
2742 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2746 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2751 if (test_bit(Journal
, &rdev
->flags
))
2753 if (strncmp(buf
, "none", 4)==0)
2756 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2760 if (rdev
->mddev
->pers
&& slot
== -1) {
2761 /* Setting 'slot' on an active array requires also
2762 * updating the 'rd%d' link, and communicating
2763 * with the personality with ->hot_*_disk.
2764 * For now we only support removing
2765 * failed/spare devices. This normally happens automatically,
2766 * but not when the metadata is externally managed.
2768 if (rdev
->raid_disk
== -1)
2770 /* personality does all needed checks */
2771 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2773 clear_bit(Blocked
, &rdev
->flags
);
2774 remove_and_add_spares(rdev
->mddev
, rdev
);
2775 if (rdev
->raid_disk
>= 0)
2777 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2778 md_wakeup_thread(rdev
->mddev
->thread
);
2779 } else if (rdev
->mddev
->pers
) {
2780 /* Activating a spare .. or possibly reactivating
2781 * if we ever get bitmaps working here.
2785 if (rdev
->raid_disk
!= -1)
2788 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2791 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2794 if (slot
>= rdev
->mddev
->raid_disks
&&
2795 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2798 rdev
->raid_disk
= slot
;
2799 if (test_bit(In_sync
, &rdev
->flags
))
2800 rdev
->saved_raid_disk
= slot
;
2802 rdev
->saved_raid_disk
= -1;
2803 clear_bit(In_sync
, &rdev
->flags
);
2804 clear_bit(Bitmap_sync
, &rdev
->flags
);
2805 err
= rdev
->mddev
->pers
->
2806 hot_add_disk(rdev
->mddev
, rdev
);
2808 rdev
->raid_disk
= -1;
2811 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2812 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2813 /* failure here is OK */;
2814 /* don't wakeup anyone, leave that to userspace. */
2816 if (slot
>= rdev
->mddev
->raid_disks
&&
2817 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2819 rdev
->raid_disk
= slot
;
2820 /* assume it is working */
2821 clear_bit(Faulty
, &rdev
->flags
);
2822 clear_bit(WriteMostly
, &rdev
->flags
);
2823 set_bit(In_sync
, &rdev
->flags
);
2824 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2829 static struct rdev_sysfs_entry rdev_slot
=
2830 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2833 offset_show(struct md_rdev
*rdev
, char *page
)
2835 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2839 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2841 unsigned long long offset
;
2842 if (kstrtoull(buf
, 10, &offset
) < 0)
2844 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2846 if (rdev
->sectors
&& rdev
->mddev
->external
)
2847 /* Must set offset before size, so overlap checks
2850 rdev
->data_offset
= offset
;
2851 rdev
->new_data_offset
= offset
;
2855 static struct rdev_sysfs_entry rdev_offset
=
2856 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2858 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2860 return sprintf(page
, "%llu\n",
2861 (unsigned long long)rdev
->new_data_offset
);
2864 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2865 const char *buf
, size_t len
)
2867 unsigned long long new_offset
;
2868 struct mddev
*mddev
= rdev
->mddev
;
2870 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2873 if (mddev
->sync_thread
||
2874 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2876 if (new_offset
== rdev
->data_offset
)
2877 /* reset is always permitted */
2879 else if (new_offset
> rdev
->data_offset
) {
2880 /* must not push array size beyond rdev_sectors */
2881 if (new_offset
- rdev
->data_offset
2882 + mddev
->dev_sectors
> rdev
->sectors
)
2885 /* Metadata worries about other space details. */
2887 /* decreasing the offset is inconsistent with a backwards
2890 if (new_offset
< rdev
->data_offset
&&
2891 mddev
->reshape_backwards
)
2893 /* Increasing offset is inconsistent with forwards
2894 * reshape. reshape_direction should be set to
2895 * 'backwards' first.
2897 if (new_offset
> rdev
->data_offset
&&
2898 !mddev
->reshape_backwards
)
2901 if (mddev
->pers
&& mddev
->persistent
&&
2902 !super_types
[mddev
->major_version
]
2903 .allow_new_offset(rdev
, new_offset
))
2905 rdev
->new_data_offset
= new_offset
;
2906 if (new_offset
> rdev
->data_offset
)
2907 mddev
->reshape_backwards
= 1;
2908 else if (new_offset
< rdev
->data_offset
)
2909 mddev
->reshape_backwards
= 0;
2913 static struct rdev_sysfs_entry rdev_new_offset
=
2914 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2917 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2919 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2922 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2924 /* check if two start/length pairs overlap */
2932 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2934 unsigned long long blocks
;
2937 if (kstrtoull(buf
, 10, &blocks
) < 0)
2940 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2941 return -EINVAL
; /* sector conversion overflow */
2944 if (new != blocks
* 2)
2945 return -EINVAL
; /* unsigned long long to sector_t overflow */
2952 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2954 struct mddev
*my_mddev
= rdev
->mddev
;
2955 sector_t oldsectors
= rdev
->sectors
;
2958 if (test_bit(Journal
, &rdev
->flags
))
2960 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2962 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2963 return -EINVAL
; /* too confusing */
2964 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2965 if (my_mddev
->persistent
) {
2966 sectors
= super_types
[my_mddev
->major_version
].
2967 rdev_size_change(rdev
, sectors
);
2970 } else if (!sectors
)
2971 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2973 if (!my_mddev
->pers
->resize
)
2974 /* Cannot change size for RAID0 or Linear etc */
2977 if (sectors
< my_mddev
->dev_sectors
)
2978 return -EINVAL
; /* component must fit device */
2980 rdev
->sectors
= sectors
;
2981 if (sectors
> oldsectors
&& my_mddev
->external
) {
2982 /* Need to check that all other rdevs with the same
2983 * ->bdev do not overlap. 'rcu' is sufficient to walk
2984 * the rdev lists safely.
2985 * This check does not provide a hard guarantee, it
2986 * just helps avoid dangerous mistakes.
2988 struct mddev
*mddev
;
2990 struct list_head
*tmp
;
2993 for_each_mddev(mddev
, tmp
) {
2994 struct md_rdev
*rdev2
;
2996 rdev_for_each(rdev2
, mddev
)
2997 if (rdev
->bdev
== rdev2
->bdev
&&
2999 overlaps(rdev
->data_offset
, rdev
->sectors
,
3012 /* Someone else could have slipped in a size
3013 * change here, but doing so is just silly.
3014 * We put oldsectors back because we *know* it is
3015 * safe, and trust userspace not to race with
3018 rdev
->sectors
= oldsectors
;
3025 static struct rdev_sysfs_entry rdev_size
=
3026 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3028 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3030 unsigned long long recovery_start
= rdev
->recovery_offset
;
3032 if (test_bit(In_sync
, &rdev
->flags
) ||
3033 recovery_start
== MaxSector
)
3034 return sprintf(page
, "none\n");
3036 return sprintf(page
, "%llu\n", recovery_start
);
3039 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3041 unsigned long long recovery_start
;
3043 if (cmd_match(buf
, "none"))
3044 recovery_start
= MaxSector
;
3045 else if (kstrtoull(buf
, 10, &recovery_start
))
3048 if (rdev
->mddev
->pers
&&
3049 rdev
->raid_disk
>= 0)
3052 rdev
->recovery_offset
= recovery_start
;
3053 if (recovery_start
== MaxSector
)
3054 set_bit(In_sync
, &rdev
->flags
);
3056 clear_bit(In_sync
, &rdev
->flags
);
3060 static struct rdev_sysfs_entry rdev_recovery_start
=
3061 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3064 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3066 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3068 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3070 return badblocks_show(&rdev
->badblocks
, page
, 0);
3072 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3074 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3075 /* Maybe that ack was all we needed */
3076 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3077 wake_up(&rdev
->blocked_wait
);
3080 static struct rdev_sysfs_entry rdev_bad_blocks
=
3081 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3083 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3085 return badblocks_show(&rdev
->badblocks
, page
, 1);
3087 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3089 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3091 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3092 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3094 static struct attribute
*rdev_default_attrs
[] = {
3099 &rdev_new_offset
.attr
,
3101 &rdev_recovery_start
.attr
,
3102 &rdev_bad_blocks
.attr
,
3103 &rdev_unack_bad_blocks
.attr
,
3107 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3109 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3110 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3116 return entry
->show(rdev
, page
);
3120 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3121 const char *page
, size_t length
)
3123 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3124 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3126 struct mddev
*mddev
= rdev
->mddev
;
3130 if (!capable(CAP_SYS_ADMIN
))
3132 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3134 if (rdev
->mddev
== NULL
)
3137 rv
= entry
->store(rdev
, page
, length
);
3138 mddev_unlock(mddev
);
3143 static void rdev_free(struct kobject
*ko
)
3145 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3148 static const struct sysfs_ops rdev_sysfs_ops
= {
3149 .show
= rdev_attr_show
,
3150 .store
= rdev_attr_store
,
3152 static struct kobj_type rdev_ktype
= {
3153 .release
= rdev_free
,
3154 .sysfs_ops
= &rdev_sysfs_ops
,
3155 .default_attrs
= rdev_default_attrs
,
3158 int md_rdev_init(struct md_rdev
*rdev
)
3161 rdev
->saved_raid_disk
= -1;
3162 rdev
->raid_disk
= -1;
3164 rdev
->data_offset
= 0;
3165 rdev
->new_data_offset
= 0;
3166 rdev
->sb_events
= 0;
3167 rdev
->last_read_error
.tv_sec
= 0;
3168 rdev
->last_read_error
.tv_nsec
= 0;
3169 rdev
->sb_loaded
= 0;
3170 rdev
->bb_page
= NULL
;
3171 atomic_set(&rdev
->nr_pending
, 0);
3172 atomic_set(&rdev
->read_errors
, 0);
3173 atomic_set(&rdev
->corrected_errors
, 0);
3175 INIT_LIST_HEAD(&rdev
->same_set
);
3176 init_waitqueue_head(&rdev
->blocked_wait
);
3178 /* Add space to store bad block list.
3179 * This reserves the space even on arrays where it cannot
3180 * be used - I wonder if that matters
3182 rdev
->badblocks
.count
= 0;
3183 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3184 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3185 seqlock_init(&rdev
->badblocks
.lock
);
3186 if (rdev
->badblocks
.page
== NULL
)
3191 EXPORT_SYMBOL_GPL(md_rdev_init
);
3193 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3195 * mark the device faulty if:
3197 * - the device is nonexistent (zero size)
3198 * - the device has no valid superblock
3200 * a faulty rdev _never_ has rdev->sb set.
3202 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3204 char b
[BDEVNAME_SIZE
];
3206 struct md_rdev
*rdev
;
3209 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3211 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3212 return ERR_PTR(-ENOMEM
);
3215 err
= md_rdev_init(rdev
);
3218 err
= alloc_disk_sb(rdev
);
3222 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3226 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3228 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3231 "md: %s has zero or unknown size, marking faulty!\n",
3232 bdevname(rdev
->bdev
,b
));
3237 if (super_format
>= 0) {
3238 err
= super_types
[super_format
].
3239 load_super(rdev
, NULL
, super_minor
);
3240 if (err
== -EINVAL
) {
3242 "md: %s does not have a valid v%d.%d "
3243 "superblock, not importing!\n",
3244 bdevname(rdev
->bdev
,b
),
3245 super_format
, super_minor
);
3250 "md: could not read %s's sb, not importing!\n",
3251 bdevname(rdev
->bdev
,b
));
3261 md_rdev_clear(rdev
);
3263 return ERR_PTR(err
);
3267 * Check a full RAID array for plausibility
3270 static void analyze_sbs(struct mddev
*mddev
)
3273 struct md_rdev
*rdev
, *freshest
, *tmp
;
3274 char b
[BDEVNAME_SIZE
];
3277 rdev_for_each_safe(rdev
, tmp
, mddev
)
3278 switch (super_types
[mddev
->major_version
].
3279 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3287 "md: fatal superblock inconsistency in %s"
3288 " -- removing from array\n",
3289 bdevname(rdev
->bdev
,b
));
3290 md_kick_rdev_from_array(rdev
);
3293 super_types
[mddev
->major_version
].
3294 validate_super(mddev
, freshest
);
3297 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3298 if (mddev
->max_disks
&&
3299 (rdev
->desc_nr
>= mddev
->max_disks
||
3300 i
> mddev
->max_disks
)) {
3302 "md: %s: %s: only %d devices permitted\n",
3303 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3305 md_kick_rdev_from_array(rdev
);
3308 if (rdev
!= freshest
) {
3309 if (super_types
[mddev
->major_version
].
3310 validate_super(mddev
, rdev
)) {
3311 printk(KERN_WARNING
"md: kicking non-fresh %s"
3313 bdevname(rdev
->bdev
,b
));
3314 md_kick_rdev_from_array(rdev
);
3318 if (mddev
->level
== LEVEL_MULTIPATH
) {
3319 rdev
->desc_nr
= i
++;
3320 rdev
->raid_disk
= rdev
->desc_nr
;
3321 set_bit(In_sync
, &rdev
->flags
);
3322 } else if (rdev
->raid_disk
>=
3323 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3324 !test_bit(Journal
, &rdev
->flags
)) {
3325 rdev
->raid_disk
= -1;
3326 clear_bit(In_sync
, &rdev
->flags
);
3331 /* Read a fixed-point number.
3332 * Numbers in sysfs attributes should be in "standard" units where
3333 * possible, so time should be in seconds.
3334 * However we internally use a a much smaller unit such as
3335 * milliseconds or jiffies.
3336 * This function takes a decimal number with a possible fractional
3337 * component, and produces an integer which is the result of
3338 * multiplying that number by 10^'scale'.
3339 * all without any floating-point arithmetic.
3341 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3343 unsigned long result
= 0;
3345 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3348 else if (decimals
< scale
) {
3351 result
= result
* 10 + value
;
3363 while (decimals
< scale
) {
3372 safe_delay_show(struct mddev
*mddev
, char *page
)
3374 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3375 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3378 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3382 if (mddev_is_clustered(mddev
)) {
3383 pr_info("md: Safemode is disabled for clustered mode\n");
3387 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3390 mddev
->safemode_delay
= 0;
3392 unsigned long old_delay
= mddev
->safemode_delay
;
3393 unsigned long new_delay
= (msec
*HZ
)/1000;
3397 mddev
->safemode_delay
= new_delay
;
3398 if (new_delay
< old_delay
|| old_delay
== 0)
3399 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3403 static struct md_sysfs_entry md_safe_delay
=
3404 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3407 level_show(struct mddev
*mddev
, char *page
)
3409 struct md_personality
*p
;
3411 spin_lock(&mddev
->lock
);
3414 ret
= sprintf(page
, "%s\n", p
->name
);
3415 else if (mddev
->clevel
[0])
3416 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3417 else if (mddev
->level
!= LEVEL_NONE
)
3418 ret
= sprintf(page
, "%d\n", mddev
->level
);
3421 spin_unlock(&mddev
->lock
);
3426 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3431 struct md_personality
*pers
, *oldpers
;
3433 void *priv
, *oldpriv
;
3434 struct md_rdev
*rdev
;
3436 if (slen
== 0 || slen
>= sizeof(clevel
))
3439 rv
= mddev_lock(mddev
);
3443 if (mddev
->pers
== NULL
) {
3444 strncpy(mddev
->clevel
, buf
, slen
);
3445 if (mddev
->clevel
[slen
-1] == '\n')
3447 mddev
->clevel
[slen
] = 0;
3448 mddev
->level
= LEVEL_NONE
;
3456 /* request to change the personality. Need to ensure:
3457 * - array is not engaged in resync/recovery/reshape
3458 * - old personality can be suspended
3459 * - new personality will access other array.
3463 if (mddev
->sync_thread
||
3464 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3465 mddev
->reshape_position
!= MaxSector
||
3466 mddev
->sysfs_active
)
3470 if (!mddev
->pers
->quiesce
) {
3471 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3472 mdname(mddev
), mddev
->pers
->name
);
3476 /* Now find the new personality */
3477 strncpy(clevel
, buf
, slen
);
3478 if (clevel
[slen
-1] == '\n')
3481 if (kstrtol(clevel
, 10, &level
))
3484 if (request_module("md-%s", clevel
) != 0)
3485 request_module("md-level-%s", clevel
);
3486 spin_lock(&pers_lock
);
3487 pers
= find_pers(level
, clevel
);
3488 if (!pers
|| !try_module_get(pers
->owner
)) {
3489 spin_unlock(&pers_lock
);
3490 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3494 spin_unlock(&pers_lock
);
3496 if (pers
== mddev
->pers
) {
3497 /* Nothing to do! */
3498 module_put(pers
->owner
);
3502 if (!pers
->takeover
) {
3503 module_put(pers
->owner
);
3504 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3505 mdname(mddev
), clevel
);
3510 rdev_for_each(rdev
, mddev
)
3511 rdev
->new_raid_disk
= rdev
->raid_disk
;
3513 /* ->takeover must set new_* and/or delta_disks
3514 * if it succeeds, and may set them when it fails.
3516 priv
= pers
->takeover(mddev
);
3518 mddev
->new_level
= mddev
->level
;
3519 mddev
->new_layout
= mddev
->layout
;
3520 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3521 mddev
->raid_disks
-= mddev
->delta_disks
;
3522 mddev
->delta_disks
= 0;
3523 mddev
->reshape_backwards
= 0;
3524 module_put(pers
->owner
);
3525 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3526 mdname(mddev
), clevel
);
3531 /* Looks like we have a winner */
3532 mddev_suspend(mddev
);
3533 mddev_detach(mddev
);
3535 spin_lock(&mddev
->lock
);
3536 oldpers
= mddev
->pers
;
3537 oldpriv
= mddev
->private;
3539 mddev
->private = priv
;
3540 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3541 mddev
->level
= mddev
->new_level
;
3542 mddev
->layout
= mddev
->new_layout
;
3543 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3544 mddev
->delta_disks
= 0;
3545 mddev
->reshape_backwards
= 0;
3546 mddev
->degraded
= 0;
3547 spin_unlock(&mddev
->lock
);
3549 if (oldpers
->sync_request
== NULL
&&
3551 /* We are converting from a no-redundancy array
3552 * to a redundancy array and metadata is managed
3553 * externally so we need to be sure that writes
3554 * won't block due to a need to transition
3556 * until external management is started.
3559 mddev
->safemode_delay
= 0;
3560 mddev
->safemode
= 0;
3563 oldpers
->free(mddev
, oldpriv
);
3565 if (oldpers
->sync_request
== NULL
&&
3566 pers
->sync_request
!= NULL
) {
3567 /* need to add the md_redundancy_group */
3568 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3570 "md: cannot register extra attributes for %s\n",
3572 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3574 if (oldpers
->sync_request
!= NULL
&&
3575 pers
->sync_request
== NULL
) {
3576 /* need to remove the md_redundancy_group */
3577 if (mddev
->to_remove
== NULL
)
3578 mddev
->to_remove
= &md_redundancy_group
;
3581 rdev_for_each(rdev
, mddev
) {
3582 if (rdev
->raid_disk
< 0)
3584 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3585 rdev
->new_raid_disk
= -1;
3586 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3588 sysfs_unlink_rdev(mddev
, rdev
);
3590 rdev_for_each(rdev
, mddev
) {
3591 if (rdev
->raid_disk
< 0)
3593 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3595 rdev
->raid_disk
= rdev
->new_raid_disk
;
3596 if (rdev
->raid_disk
< 0)
3597 clear_bit(In_sync
, &rdev
->flags
);
3599 if (sysfs_link_rdev(mddev
, rdev
))
3600 printk(KERN_WARNING
"md: cannot register rd%d"
3601 " for %s after level change\n",
3602 rdev
->raid_disk
, mdname(mddev
));
3606 if (pers
->sync_request
== NULL
) {
3607 /* this is now an array without redundancy, so
3608 * it must always be in_sync
3611 del_timer_sync(&mddev
->safemode_timer
);
3613 blk_set_stacking_limits(&mddev
->queue
->limits
);
3615 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3616 mddev_resume(mddev
);
3618 md_update_sb(mddev
, 1);
3619 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3620 md_new_event(mddev
);
3623 mddev_unlock(mddev
);
3627 static struct md_sysfs_entry md_level
=
3628 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3631 layout_show(struct mddev
*mddev
, char *page
)
3633 /* just a number, not meaningful for all levels */
3634 if (mddev
->reshape_position
!= MaxSector
&&
3635 mddev
->layout
!= mddev
->new_layout
)
3636 return sprintf(page
, "%d (%d)\n",
3637 mddev
->new_layout
, mddev
->layout
);
3638 return sprintf(page
, "%d\n", mddev
->layout
);
3642 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3647 err
= kstrtouint(buf
, 10, &n
);
3650 err
= mddev_lock(mddev
);
3655 if (mddev
->pers
->check_reshape
== NULL
)
3660 mddev
->new_layout
= n
;
3661 err
= mddev
->pers
->check_reshape(mddev
);
3663 mddev
->new_layout
= mddev
->layout
;
3666 mddev
->new_layout
= n
;
3667 if (mddev
->reshape_position
== MaxSector
)
3670 mddev_unlock(mddev
);
3673 static struct md_sysfs_entry md_layout
=
3674 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3677 raid_disks_show(struct mddev
*mddev
, char *page
)
3679 if (mddev
->raid_disks
== 0)
3681 if (mddev
->reshape_position
!= MaxSector
&&
3682 mddev
->delta_disks
!= 0)
3683 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3684 mddev
->raid_disks
- mddev
->delta_disks
);
3685 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3688 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3691 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3696 err
= kstrtouint(buf
, 10, &n
);
3700 err
= mddev_lock(mddev
);
3704 err
= update_raid_disks(mddev
, n
);
3705 else if (mddev
->reshape_position
!= MaxSector
) {
3706 struct md_rdev
*rdev
;
3707 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3710 rdev_for_each(rdev
, mddev
) {
3712 rdev
->data_offset
< rdev
->new_data_offset
)
3715 rdev
->data_offset
> rdev
->new_data_offset
)
3719 mddev
->delta_disks
= n
- olddisks
;
3720 mddev
->raid_disks
= n
;
3721 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3723 mddev
->raid_disks
= n
;
3725 mddev_unlock(mddev
);
3726 return err
? err
: len
;
3728 static struct md_sysfs_entry md_raid_disks
=
3729 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3732 chunk_size_show(struct mddev
*mddev
, char *page
)
3734 if (mddev
->reshape_position
!= MaxSector
&&
3735 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3736 return sprintf(page
, "%d (%d)\n",
3737 mddev
->new_chunk_sectors
<< 9,
3738 mddev
->chunk_sectors
<< 9);
3739 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3743 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3748 err
= kstrtoul(buf
, 10, &n
);
3752 err
= mddev_lock(mddev
);
3756 if (mddev
->pers
->check_reshape
== NULL
)
3761 mddev
->new_chunk_sectors
= n
>> 9;
3762 err
= mddev
->pers
->check_reshape(mddev
);
3764 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3767 mddev
->new_chunk_sectors
= n
>> 9;
3768 if (mddev
->reshape_position
== MaxSector
)
3769 mddev
->chunk_sectors
= n
>> 9;
3771 mddev_unlock(mddev
);
3774 static struct md_sysfs_entry md_chunk_size
=
3775 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3778 resync_start_show(struct mddev
*mddev
, char *page
)
3780 if (mddev
->recovery_cp
== MaxSector
)
3781 return sprintf(page
, "none\n");
3782 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3786 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3788 unsigned long long n
;
3791 if (cmd_match(buf
, "none"))
3794 err
= kstrtoull(buf
, 10, &n
);
3797 if (n
!= (sector_t
)n
)
3801 err
= mddev_lock(mddev
);
3804 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3808 mddev
->recovery_cp
= n
;
3810 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3812 mddev_unlock(mddev
);
3815 static struct md_sysfs_entry md_resync_start
=
3816 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3817 resync_start_show
, resync_start_store
);
3820 * The array state can be:
3823 * No devices, no size, no level
3824 * Equivalent to STOP_ARRAY ioctl
3826 * May have some settings, but array is not active
3827 * all IO results in error
3828 * When written, doesn't tear down array, but just stops it
3829 * suspended (not supported yet)
3830 * All IO requests will block. The array can be reconfigured.
3831 * Writing this, if accepted, will block until array is quiescent
3833 * no resync can happen. no superblocks get written.
3834 * write requests fail
3836 * like readonly, but behaves like 'clean' on a write request.
3838 * clean - no pending writes, but otherwise active.
3839 * When written to inactive array, starts without resync
3840 * If a write request arrives then
3841 * if metadata is known, mark 'dirty' and switch to 'active'.
3842 * if not known, block and switch to write-pending
3843 * If written to an active array that has pending writes, then fails.
3845 * fully active: IO and resync can be happening.
3846 * When written to inactive array, starts with resync
3849 * clean, but writes are blocked waiting for 'active' to be written.
3852 * like active, but no writes have been seen for a while (100msec).
3855 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3856 write_pending
, active_idle
, bad_word
};
3857 static char *array_states
[] = {
3858 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3859 "write-pending", "active-idle", NULL
};
3861 static int match_word(const char *word
, char **list
)
3864 for (n
=0; list
[n
]; n
++)
3865 if (cmd_match(word
, list
[n
]))
3871 array_state_show(struct mddev
*mddev
, char *page
)
3873 enum array_state st
= inactive
;
3886 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3888 else if (mddev
->safemode
)
3894 if (list_empty(&mddev
->disks
) &&
3895 mddev
->raid_disks
== 0 &&
3896 mddev
->dev_sectors
== 0)
3901 return sprintf(page
, "%s\n", array_states
[st
]);
3904 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3905 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3906 static int do_md_run(struct mddev
*mddev
);
3907 static int restart_array(struct mddev
*mddev
);
3910 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3913 enum array_state st
= match_word(buf
, array_states
);
3915 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3916 /* don't take reconfig_mutex when toggling between
3919 spin_lock(&mddev
->lock
);
3921 restart_array(mddev
);
3922 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3923 wake_up(&mddev
->sb_wait
);
3925 } else /* st == clean */ {
3926 restart_array(mddev
);
3927 if (atomic_read(&mddev
->writes_pending
) == 0) {
3928 if (mddev
->in_sync
== 0) {
3930 if (mddev
->safemode
== 1)
3931 mddev
->safemode
= 0;
3932 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3938 spin_unlock(&mddev
->lock
);
3941 err
= mddev_lock(mddev
);
3949 /* stopping an active array */
3950 err
= do_md_stop(mddev
, 0, NULL
);
3953 /* stopping an active array */
3955 err
= do_md_stop(mddev
, 2, NULL
);
3957 err
= 0; /* already inactive */
3960 break; /* not supported yet */
3963 err
= md_set_readonly(mddev
, NULL
);
3966 set_disk_ro(mddev
->gendisk
, 1);
3967 err
= do_md_run(mddev
);
3973 err
= md_set_readonly(mddev
, NULL
);
3974 else if (mddev
->ro
== 1)
3975 err
= restart_array(mddev
);
3978 set_disk_ro(mddev
->gendisk
, 0);
3982 err
= do_md_run(mddev
);
3987 err
= restart_array(mddev
);
3990 spin_lock(&mddev
->lock
);
3991 if (atomic_read(&mddev
->writes_pending
) == 0) {
3992 if (mddev
->in_sync
== 0) {
3994 if (mddev
->safemode
== 1)
3995 mddev
->safemode
= 0;
3996 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
4001 spin_unlock(&mddev
->lock
);
4007 err
= restart_array(mddev
);
4010 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
4011 wake_up(&mddev
->sb_wait
);
4015 set_disk_ro(mddev
->gendisk
, 0);
4016 err
= do_md_run(mddev
);
4021 /* these cannot be set */
4026 if (mddev
->hold_active
== UNTIL_IOCTL
)
4027 mddev
->hold_active
= 0;
4028 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4030 mddev_unlock(mddev
);
4033 static struct md_sysfs_entry md_array_state
=
4034 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4037 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4038 return sprintf(page
, "%d\n",
4039 atomic_read(&mddev
->max_corr_read_errors
));
4043 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4048 rv
= kstrtouint(buf
, 10, &n
);
4051 atomic_set(&mddev
->max_corr_read_errors
, n
);
4055 static struct md_sysfs_entry max_corr_read_errors
=
4056 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4057 max_corrected_read_errors_store
);
4060 null_show(struct mddev
*mddev
, char *page
)
4066 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4068 /* buf must be %d:%d\n? giving major and minor numbers */
4069 /* The new device is added to the array.
4070 * If the array has a persistent superblock, we read the
4071 * superblock to initialise info and check validity.
4072 * Otherwise, only checking done is that in bind_rdev_to_array,
4073 * which mainly checks size.
4076 int major
= simple_strtoul(buf
, &e
, 10);
4079 struct md_rdev
*rdev
;
4082 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4084 minor
= simple_strtoul(e
+1, &e
, 10);
4085 if (*e
&& *e
!= '\n')
4087 dev
= MKDEV(major
, minor
);
4088 if (major
!= MAJOR(dev
) ||
4089 minor
!= MINOR(dev
))
4092 flush_workqueue(md_misc_wq
);
4094 err
= mddev_lock(mddev
);
4097 if (mddev
->persistent
) {
4098 rdev
= md_import_device(dev
, mddev
->major_version
,
4099 mddev
->minor_version
);
4100 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4101 struct md_rdev
*rdev0
4102 = list_entry(mddev
->disks
.next
,
4103 struct md_rdev
, same_set
);
4104 err
= super_types
[mddev
->major_version
]
4105 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4109 } else if (mddev
->external
)
4110 rdev
= md_import_device(dev
, -2, -1);
4112 rdev
= md_import_device(dev
, -1, -1);
4115 mddev_unlock(mddev
);
4116 return PTR_ERR(rdev
);
4118 err
= bind_rdev_to_array(rdev
, mddev
);
4122 mddev_unlock(mddev
);
4123 return err
? err
: len
;
4126 static struct md_sysfs_entry md_new_device
=
4127 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4130 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4133 unsigned long chunk
, end_chunk
;
4136 err
= mddev_lock(mddev
);
4141 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4143 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4144 if (buf
== end
) break;
4145 if (*end
== '-') { /* range */
4147 end_chunk
= simple_strtoul(buf
, &end
, 0);
4148 if (buf
== end
) break;
4150 if (*end
&& !isspace(*end
)) break;
4151 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4152 buf
= skip_spaces(end
);
4154 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4156 mddev_unlock(mddev
);
4160 static struct md_sysfs_entry md_bitmap
=
4161 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4164 size_show(struct mddev
*mddev
, char *page
)
4166 return sprintf(page
, "%llu\n",
4167 (unsigned long long)mddev
->dev_sectors
/ 2);
4170 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4173 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4175 /* If array is inactive, we can reduce the component size, but
4176 * not increase it (except from 0).
4177 * If array is active, we can try an on-line resize
4180 int err
= strict_blocks_to_sectors(buf
, §ors
);
4184 err
= mddev_lock(mddev
);
4188 err
= update_size(mddev
, sectors
);
4189 md_update_sb(mddev
, 1);
4191 if (mddev
->dev_sectors
== 0 ||
4192 mddev
->dev_sectors
> sectors
)
4193 mddev
->dev_sectors
= sectors
;
4197 mddev_unlock(mddev
);
4198 return err
? err
: len
;
4201 static struct md_sysfs_entry md_size
=
4202 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4204 /* Metadata version.
4206 * 'none' for arrays with no metadata (good luck...)
4207 * 'external' for arrays with externally managed metadata,
4208 * or N.M for internally known formats
4211 metadata_show(struct mddev
*mddev
, char *page
)
4213 if (mddev
->persistent
)
4214 return sprintf(page
, "%d.%d\n",
4215 mddev
->major_version
, mddev
->minor_version
);
4216 else if (mddev
->external
)
4217 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4219 return sprintf(page
, "none\n");
4223 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4228 /* Changing the details of 'external' metadata is
4229 * always permitted. Otherwise there must be
4230 * no devices attached to the array.
4233 err
= mddev_lock(mddev
);
4237 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4239 else if (!list_empty(&mddev
->disks
))
4243 if (cmd_match(buf
, "none")) {
4244 mddev
->persistent
= 0;
4245 mddev
->external
= 0;
4246 mddev
->major_version
= 0;
4247 mddev
->minor_version
= 90;
4250 if (strncmp(buf
, "external:", 9) == 0) {
4251 size_t namelen
= len
-9;
4252 if (namelen
>= sizeof(mddev
->metadata_type
))
4253 namelen
= sizeof(mddev
->metadata_type
)-1;
4254 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4255 mddev
->metadata_type
[namelen
] = 0;
4256 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4257 mddev
->metadata_type
[--namelen
] = 0;
4258 mddev
->persistent
= 0;
4259 mddev
->external
= 1;
4260 mddev
->major_version
= 0;
4261 mddev
->minor_version
= 90;
4264 major
= simple_strtoul(buf
, &e
, 10);
4266 if (e
==buf
|| *e
!= '.')
4269 minor
= simple_strtoul(buf
, &e
, 10);
4270 if (e
==buf
|| (*e
&& *e
!= '\n') )
4273 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4275 mddev
->major_version
= major
;
4276 mddev
->minor_version
= minor
;
4277 mddev
->persistent
= 1;
4278 mddev
->external
= 0;
4281 mddev_unlock(mddev
);
4285 static struct md_sysfs_entry md_metadata
=
4286 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4289 action_show(struct mddev
*mddev
, char *page
)
4291 char *type
= "idle";
4292 unsigned long recovery
= mddev
->recovery
;
4293 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4295 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4296 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4297 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4299 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4300 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4302 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4306 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4308 else if (mddev
->reshape_position
!= MaxSector
)
4311 return sprintf(page
, "%s\n", type
);
4315 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4317 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4321 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4322 if (cmd_match(page
, "frozen"))
4323 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4325 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4326 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4327 mddev_lock(mddev
) == 0) {
4328 flush_workqueue(md_misc_wq
);
4329 if (mddev
->sync_thread
) {
4330 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4331 md_reap_sync_thread(mddev
);
4333 mddev_unlock(mddev
);
4335 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4337 else if (cmd_match(page
, "resync"))
4338 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4339 else if (cmd_match(page
, "recover")) {
4340 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4341 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4342 } else if (cmd_match(page
, "reshape")) {
4344 if (mddev
->pers
->start_reshape
== NULL
)
4346 err
= mddev_lock(mddev
);
4348 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4351 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4352 err
= mddev
->pers
->start_reshape(mddev
);
4354 mddev_unlock(mddev
);
4358 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4360 if (cmd_match(page
, "check"))
4361 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4362 else if (!cmd_match(page
, "repair"))
4364 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4365 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4366 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4368 if (mddev
->ro
== 2) {
4369 /* A write to sync_action is enough to justify
4370 * canceling read-auto mode
4373 md_wakeup_thread(mddev
->sync_thread
);
4375 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4376 md_wakeup_thread(mddev
->thread
);
4377 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4381 static struct md_sysfs_entry md_scan_mode
=
4382 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4385 last_sync_action_show(struct mddev
*mddev
, char *page
)
4387 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4390 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4393 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4395 return sprintf(page
, "%llu\n",
4396 (unsigned long long)
4397 atomic64_read(&mddev
->resync_mismatches
));
4400 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4403 sync_min_show(struct mddev
*mddev
, char *page
)
4405 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4406 mddev
->sync_speed_min
? "local": "system");
4410 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4415 if (strncmp(buf
, "system", 6)==0) {
4418 rv
= kstrtouint(buf
, 10, &min
);
4424 mddev
->sync_speed_min
= min
;
4428 static struct md_sysfs_entry md_sync_min
=
4429 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4432 sync_max_show(struct mddev
*mddev
, char *page
)
4434 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4435 mddev
->sync_speed_max
? "local": "system");
4439 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4444 if (strncmp(buf
, "system", 6)==0) {
4447 rv
= kstrtouint(buf
, 10, &max
);
4453 mddev
->sync_speed_max
= max
;
4457 static struct md_sysfs_entry md_sync_max
=
4458 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4461 degraded_show(struct mddev
*mddev
, char *page
)
4463 return sprintf(page
, "%d\n", mddev
->degraded
);
4465 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4468 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4470 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4474 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4478 if (kstrtol(buf
, 10, &n
))
4481 if (n
!= 0 && n
!= 1)
4484 mddev
->parallel_resync
= n
;
4486 if (mddev
->sync_thread
)
4487 wake_up(&resync_wait
);
4492 /* force parallel resync, even with shared block devices */
4493 static struct md_sysfs_entry md_sync_force_parallel
=
4494 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4495 sync_force_parallel_show
, sync_force_parallel_store
);
4498 sync_speed_show(struct mddev
*mddev
, char *page
)
4500 unsigned long resync
, dt
, db
;
4501 if (mddev
->curr_resync
== 0)
4502 return sprintf(page
, "none\n");
4503 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4504 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4506 db
= resync
- mddev
->resync_mark_cnt
;
4507 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4510 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4513 sync_completed_show(struct mddev
*mddev
, char *page
)
4515 unsigned long long max_sectors
, resync
;
4517 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4518 return sprintf(page
, "none\n");
4520 if (mddev
->curr_resync
== 1 ||
4521 mddev
->curr_resync
== 2)
4522 return sprintf(page
, "delayed\n");
4524 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4525 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4526 max_sectors
= mddev
->resync_max_sectors
;
4528 max_sectors
= mddev
->dev_sectors
;
4530 resync
= mddev
->curr_resync_completed
;
4531 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4534 static struct md_sysfs_entry md_sync_completed
=
4535 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4538 min_sync_show(struct mddev
*mddev
, char *page
)
4540 return sprintf(page
, "%llu\n",
4541 (unsigned long long)mddev
->resync_min
);
4544 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4546 unsigned long long min
;
4549 if (kstrtoull(buf
, 10, &min
))
4552 spin_lock(&mddev
->lock
);
4554 if (min
> mddev
->resync_max
)
4558 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4561 /* Round down to multiple of 4K for safety */
4562 mddev
->resync_min
= round_down(min
, 8);
4566 spin_unlock(&mddev
->lock
);
4570 static struct md_sysfs_entry md_min_sync
=
4571 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4574 max_sync_show(struct mddev
*mddev
, char *page
)
4576 if (mddev
->resync_max
== MaxSector
)
4577 return sprintf(page
, "max\n");
4579 return sprintf(page
, "%llu\n",
4580 (unsigned long long)mddev
->resync_max
);
4583 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4586 spin_lock(&mddev
->lock
);
4587 if (strncmp(buf
, "max", 3) == 0)
4588 mddev
->resync_max
= MaxSector
;
4590 unsigned long long max
;
4594 if (kstrtoull(buf
, 10, &max
))
4596 if (max
< mddev
->resync_min
)
4600 if (max
< mddev
->resync_max
&&
4602 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4605 /* Must be a multiple of chunk_size */
4606 chunk
= mddev
->chunk_sectors
;
4608 sector_t temp
= max
;
4611 if (sector_div(temp
, chunk
))
4614 mddev
->resync_max
= max
;
4616 wake_up(&mddev
->recovery_wait
);
4619 spin_unlock(&mddev
->lock
);
4623 static struct md_sysfs_entry md_max_sync
=
4624 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4627 suspend_lo_show(struct mddev
*mddev
, char *page
)
4629 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4633 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4635 unsigned long long old
, new;
4638 err
= kstrtoull(buf
, 10, &new);
4641 if (new != (sector_t
)new)
4644 err
= mddev_lock(mddev
);
4648 if (mddev
->pers
== NULL
||
4649 mddev
->pers
->quiesce
== NULL
)
4651 old
= mddev
->suspend_lo
;
4652 mddev
->suspend_lo
= new;
4654 /* Shrinking suspended region */
4655 mddev
->pers
->quiesce(mddev
, 2);
4657 /* Expanding suspended region - need to wait */
4658 mddev
->pers
->quiesce(mddev
, 1);
4659 mddev
->pers
->quiesce(mddev
, 0);
4663 mddev_unlock(mddev
);
4666 static struct md_sysfs_entry md_suspend_lo
=
4667 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4670 suspend_hi_show(struct mddev
*mddev
, char *page
)
4672 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4676 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4678 unsigned long long old
, new;
4681 err
= kstrtoull(buf
, 10, &new);
4684 if (new != (sector_t
)new)
4687 err
= mddev_lock(mddev
);
4691 if (mddev
->pers
== NULL
||
4692 mddev
->pers
->quiesce
== NULL
)
4694 old
= mddev
->suspend_hi
;
4695 mddev
->suspend_hi
= new;
4697 /* Shrinking suspended region */
4698 mddev
->pers
->quiesce(mddev
, 2);
4700 /* Expanding suspended region - need to wait */
4701 mddev
->pers
->quiesce(mddev
, 1);
4702 mddev
->pers
->quiesce(mddev
, 0);
4706 mddev_unlock(mddev
);
4709 static struct md_sysfs_entry md_suspend_hi
=
4710 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4713 reshape_position_show(struct mddev
*mddev
, char *page
)
4715 if (mddev
->reshape_position
!= MaxSector
)
4716 return sprintf(page
, "%llu\n",
4717 (unsigned long long)mddev
->reshape_position
);
4718 strcpy(page
, "none\n");
4723 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4725 struct md_rdev
*rdev
;
4726 unsigned long long new;
4729 err
= kstrtoull(buf
, 10, &new);
4732 if (new != (sector_t
)new)
4734 err
= mddev_lock(mddev
);
4740 mddev
->reshape_position
= new;
4741 mddev
->delta_disks
= 0;
4742 mddev
->reshape_backwards
= 0;
4743 mddev
->new_level
= mddev
->level
;
4744 mddev
->new_layout
= mddev
->layout
;
4745 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4746 rdev_for_each(rdev
, mddev
)
4747 rdev
->new_data_offset
= rdev
->data_offset
;
4750 mddev_unlock(mddev
);
4754 static struct md_sysfs_entry md_reshape_position
=
4755 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4756 reshape_position_store
);
4759 reshape_direction_show(struct mddev
*mddev
, char *page
)
4761 return sprintf(page
, "%s\n",
4762 mddev
->reshape_backwards
? "backwards" : "forwards");
4766 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4771 if (cmd_match(buf
, "forwards"))
4773 else if (cmd_match(buf
, "backwards"))
4777 if (mddev
->reshape_backwards
== backwards
)
4780 err
= mddev_lock(mddev
);
4783 /* check if we are allowed to change */
4784 if (mddev
->delta_disks
)
4786 else if (mddev
->persistent
&&
4787 mddev
->major_version
== 0)
4790 mddev
->reshape_backwards
= backwards
;
4791 mddev_unlock(mddev
);
4795 static struct md_sysfs_entry md_reshape_direction
=
4796 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4797 reshape_direction_store
);
4800 array_size_show(struct mddev
*mddev
, char *page
)
4802 if (mddev
->external_size
)
4803 return sprintf(page
, "%llu\n",
4804 (unsigned long long)mddev
->array_sectors
/2);
4806 return sprintf(page
, "default\n");
4810 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4815 err
= mddev_lock(mddev
);
4819 if (strncmp(buf
, "default", 7) == 0) {
4821 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4823 sectors
= mddev
->array_sectors
;
4825 mddev
->external_size
= 0;
4827 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4829 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4832 mddev
->external_size
= 1;
4836 mddev
->array_sectors
= sectors
;
4838 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4839 revalidate_disk(mddev
->gendisk
);
4842 mddev_unlock(mddev
);
4846 static struct md_sysfs_entry md_array_size
=
4847 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4850 static struct attribute
*md_default_attrs
[] = {
4853 &md_raid_disks
.attr
,
4854 &md_chunk_size
.attr
,
4856 &md_resync_start
.attr
,
4858 &md_new_device
.attr
,
4859 &md_safe_delay
.attr
,
4860 &md_array_state
.attr
,
4861 &md_reshape_position
.attr
,
4862 &md_reshape_direction
.attr
,
4863 &md_array_size
.attr
,
4864 &max_corr_read_errors
.attr
,
4868 static struct attribute
*md_redundancy_attrs
[] = {
4870 &md_last_scan_mode
.attr
,
4871 &md_mismatches
.attr
,
4874 &md_sync_speed
.attr
,
4875 &md_sync_force_parallel
.attr
,
4876 &md_sync_completed
.attr
,
4879 &md_suspend_lo
.attr
,
4880 &md_suspend_hi
.attr
,
4885 static struct attribute_group md_redundancy_group
= {
4887 .attrs
= md_redundancy_attrs
,
4891 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4893 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4894 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4899 spin_lock(&all_mddevs_lock
);
4900 if (list_empty(&mddev
->all_mddevs
)) {
4901 spin_unlock(&all_mddevs_lock
);
4905 spin_unlock(&all_mddevs_lock
);
4907 rv
= entry
->show(mddev
, page
);
4913 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4914 const char *page
, size_t length
)
4916 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4917 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4922 if (!capable(CAP_SYS_ADMIN
))
4924 spin_lock(&all_mddevs_lock
);
4925 if (list_empty(&mddev
->all_mddevs
)) {
4926 spin_unlock(&all_mddevs_lock
);
4930 spin_unlock(&all_mddevs_lock
);
4931 rv
= entry
->store(mddev
, page
, length
);
4936 static void md_free(struct kobject
*ko
)
4938 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4940 if (mddev
->sysfs_state
)
4941 sysfs_put(mddev
->sysfs_state
);
4944 blk_cleanup_queue(mddev
->queue
);
4945 if (mddev
->gendisk
) {
4946 del_gendisk(mddev
->gendisk
);
4947 put_disk(mddev
->gendisk
);
4953 static const struct sysfs_ops md_sysfs_ops
= {
4954 .show
= md_attr_show
,
4955 .store
= md_attr_store
,
4957 static struct kobj_type md_ktype
= {
4959 .sysfs_ops
= &md_sysfs_ops
,
4960 .default_attrs
= md_default_attrs
,
4965 static void mddev_delayed_delete(struct work_struct
*ws
)
4967 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4969 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4970 kobject_del(&mddev
->kobj
);
4971 kobject_put(&mddev
->kobj
);
4974 static int md_alloc(dev_t dev
, char *name
)
4976 static DEFINE_MUTEX(disks_mutex
);
4977 struct mddev
*mddev
= mddev_find(dev
);
4978 struct gendisk
*disk
;
4987 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4988 shift
= partitioned
? MdpMinorShift
: 0;
4989 unit
= MINOR(mddev
->unit
) >> shift
;
4991 /* wait for any previous instance of this device to be
4992 * completely removed (mddev_delayed_delete).
4994 flush_workqueue(md_misc_wq
);
4996 mutex_lock(&disks_mutex
);
5002 /* Need to ensure that 'name' is not a duplicate.
5004 struct mddev
*mddev2
;
5005 spin_lock(&all_mddevs_lock
);
5007 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5008 if (mddev2
->gendisk
&&
5009 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5010 spin_unlock(&all_mddevs_lock
);
5013 spin_unlock(&all_mddevs_lock
);
5017 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5020 mddev
->queue
->queuedata
= mddev
;
5022 blk_queue_make_request(mddev
->queue
, md_make_request
);
5023 blk_set_stacking_limits(&mddev
->queue
->limits
);
5025 disk
= alloc_disk(1 << shift
);
5027 blk_cleanup_queue(mddev
->queue
);
5028 mddev
->queue
= NULL
;
5031 disk
->major
= MAJOR(mddev
->unit
);
5032 disk
->first_minor
= unit
<< shift
;
5034 strcpy(disk
->disk_name
, name
);
5035 else if (partitioned
)
5036 sprintf(disk
->disk_name
, "md_d%d", unit
);
5038 sprintf(disk
->disk_name
, "md%d", unit
);
5039 disk
->fops
= &md_fops
;
5040 disk
->private_data
= mddev
;
5041 disk
->queue
= mddev
->queue
;
5042 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
5043 /* Allow extended partitions. This makes the
5044 * 'mdp' device redundant, but we can't really
5047 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5048 mddev
->gendisk
= disk
;
5049 /* As soon as we call add_disk(), another thread could get
5050 * through to md_open, so make sure it doesn't get too far
5052 mutex_lock(&mddev
->open_mutex
);
5055 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5056 &disk_to_dev(disk
)->kobj
, "%s", "md");
5058 /* This isn't possible, but as kobject_init_and_add is marked
5059 * __must_check, we must do something with the result
5061 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
5065 if (mddev
->kobj
.sd
&&
5066 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5067 printk(KERN_DEBUG
"pointless warning\n");
5068 mutex_unlock(&mddev
->open_mutex
);
5070 mutex_unlock(&disks_mutex
);
5071 if (!error
&& mddev
->kobj
.sd
) {
5072 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5073 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5079 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5081 md_alloc(dev
, NULL
);
5085 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5087 /* val must be "md_*" where * is not all digits.
5088 * We allocate an array with a large free minor number, and
5089 * set the name to val. val must not already be an active name.
5091 int len
= strlen(val
);
5092 char buf
[DISK_NAME_LEN
];
5094 while (len
&& val
[len
-1] == '\n')
5096 if (len
>= DISK_NAME_LEN
)
5098 strlcpy(buf
, val
, len
+1);
5099 if (strncmp(buf
, "md_", 3) != 0)
5101 return md_alloc(0, buf
);
5104 static void md_safemode_timeout(unsigned long data
)
5106 struct mddev
*mddev
= (struct mddev
*) data
;
5108 if (!atomic_read(&mddev
->writes_pending
)) {
5109 mddev
->safemode
= 1;
5110 if (mddev
->external
)
5111 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5113 md_wakeup_thread(mddev
->thread
);
5116 static int start_dirty_degraded
;
5118 int md_run(struct mddev
*mddev
)
5121 struct md_rdev
*rdev
;
5122 struct md_personality
*pers
;
5124 if (list_empty(&mddev
->disks
))
5125 /* cannot run an array with no devices.. */
5130 /* Cannot run until previous stop completes properly */
5131 if (mddev
->sysfs_active
)
5135 * Analyze all RAID superblock(s)
5137 if (!mddev
->raid_disks
) {
5138 if (!mddev
->persistent
)
5143 if (mddev
->level
!= LEVEL_NONE
)
5144 request_module("md-level-%d", mddev
->level
);
5145 else if (mddev
->clevel
[0])
5146 request_module("md-%s", mddev
->clevel
);
5149 * Drop all container device buffers, from now on
5150 * the only valid external interface is through the md
5153 rdev_for_each(rdev
, mddev
) {
5154 if (test_bit(Faulty
, &rdev
->flags
))
5156 sync_blockdev(rdev
->bdev
);
5157 invalidate_bdev(rdev
->bdev
);
5159 /* perform some consistency tests on the device.
5160 * We don't want the data to overlap the metadata,
5161 * Internal Bitmap issues have been handled elsewhere.
5163 if (rdev
->meta_bdev
) {
5164 /* Nothing to check */;
5165 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5166 if (mddev
->dev_sectors
&&
5167 rdev
->data_offset
+ mddev
->dev_sectors
5169 printk("md: %s: data overlaps metadata\n",
5174 if (rdev
->sb_start
+ rdev
->sb_size
/512
5175 > rdev
->data_offset
) {
5176 printk("md: %s: metadata overlaps data\n",
5181 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5184 if (mddev
->bio_set
== NULL
)
5185 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5187 spin_lock(&pers_lock
);
5188 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5189 if (!pers
|| !try_module_get(pers
->owner
)) {
5190 spin_unlock(&pers_lock
);
5191 if (mddev
->level
!= LEVEL_NONE
)
5192 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5195 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5199 spin_unlock(&pers_lock
);
5200 if (mddev
->level
!= pers
->level
) {
5201 mddev
->level
= pers
->level
;
5202 mddev
->new_level
= pers
->level
;
5204 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5206 if (mddev
->reshape_position
!= MaxSector
&&
5207 pers
->start_reshape
== NULL
) {
5208 /* This personality cannot handle reshaping... */
5209 module_put(pers
->owner
);
5213 if (pers
->sync_request
) {
5214 /* Warn if this is a potentially silly
5217 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5218 struct md_rdev
*rdev2
;
5221 rdev_for_each(rdev
, mddev
)
5222 rdev_for_each(rdev2
, mddev
) {
5224 rdev
->bdev
->bd_contains
==
5225 rdev2
->bdev
->bd_contains
) {
5227 "%s: WARNING: %s appears to be"
5228 " on the same physical disk as"
5231 bdevname(rdev
->bdev
,b
),
5232 bdevname(rdev2
->bdev
,b2
));
5239 "True protection against single-disk"
5240 " failure might be compromised.\n");
5243 mddev
->recovery
= 0;
5244 /* may be over-ridden by personality */
5245 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5247 mddev
->ok_start_degraded
= start_dirty_degraded
;
5249 if (start_readonly
&& mddev
->ro
== 0)
5250 mddev
->ro
= 2; /* read-only, but switch on first write */
5252 err
= pers
->run(mddev
);
5254 printk(KERN_ERR
"md: pers->run() failed ...\n");
5255 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5256 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5257 " but 'external_size' not in effect?\n", __func__
);
5259 "md: invalid array_size %llu > default size %llu\n",
5260 (unsigned long long)mddev
->array_sectors
/ 2,
5261 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5264 if (err
== 0 && pers
->sync_request
&&
5265 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5266 struct bitmap
*bitmap
;
5268 bitmap
= bitmap_create(mddev
, -1);
5269 if (IS_ERR(bitmap
)) {
5270 err
= PTR_ERR(bitmap
);
5271 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5272 mdname(mddev
), err
);
5274 mddev
->bitmap
= bitmap
;
5278 mddev_detach(mddev
);
5280 pers
->free(mddev
, mddev
->private);
5281 mddev
->private = NULL
;
5282 module_put(pers
->owner
);
5283 bitmap_destroy(mddev
);
5287 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5288 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5290 if (pers
->sync_request
) {
5291 if (mddev
->kobj
.sd
&&
5292 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5294 "md: cannot register extra attributes for %s\n",
5296 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5297 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5300 atomic_set(&mddev
->writes_pending
,0);
5301 atomic_set(&mddev
->max_corr_read_errors
,
5302 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5303 mddev
->safemode
= 0;
5304 if (mddev_is_clustered(mddev
))
5305 mddev
->safemode_delay
= 0;
5307 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5310 spin_lock(&mddev
->lock
);
5313 spin_unlock(&mddev
->lock
);
5314 rdev_for_each(rdev
, mddev
)
5315 if (rdev
->raid_disk
>= 0)
5316 if (sysfs_link_rdev(mddev
, rdev
))
5317 /* failure here is OK */;
5319 if (mddev
->degraded
&& !mddev
->ro
)
5320 /* This ensures that recovering status is reported immediately
5321 * via sysfs - until a lack of spares is confirmed.
5323 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5324 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5326 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5327 md_update_sb(mddev
, 0);
5329 md_new_event(mddev
);
5330 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5331 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5332 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5335 EXPORT_SYMBOL_GPL(md_run
);
5337 static int do_md_run(struct mddev
*mddev
)
5341 err
= md_run(mddev
);
5344 err
= bitmap_load(mddev
);
5346 bitmap_destroy(mddev
);
5350 if (mddev_is_clustered(mddev
))
5351 md_allow_write(mddev
);
5353 md_wakeup_thread(mddev
->thread
);
5354 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5356 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5357 revalidate_disk(mddev
->gendisk
);
5359 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5364 static int restart_array(struct mddev
*mddev
)
5366 struct gendisk
*disk
= mddev
->gendisk
;
5368 /* Complain if it has no devices */
5369 if (list_empty(&mddev
->disks
))
5375 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5376 struct md_rdev
*rdev
;
5377 bool has_journal
= false;
5380 rdev_for_each_rcu(rdev
, mddev
) {
5381 if (test_bit(Journal
, &rdev
->flags
) &&
5382 !test_bit(Faulty
, &rdev
->flags
)) {
5389 /* Don't restart rw with journal missing/faulty */
5394 mddev
->safemode
= 0;
5396 set_disk_ro(disk
, 0);
5397 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5399 /* Kick recovery or resync if necessary */
5400 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5401 md_wakeup_thread(mddev
->thread
);
5402 md_wakeup_thread(mddev
->sync_thread
);
5403 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5407 static void md_clean(struct mddev
*mddev
)
5409 mddev
->array_sectors
= 0;
5410 mddev
->external_size
= 0;
5411 mddev
->dev_sectors
= 0;
5412 mddev
->raid_disks
= 0;
5413 mddev
->recovery_cp
= 0;
5414 mddev
->resync_min
= 0;
5415 mddev
->resync_max
= MaxSector
;
5416 mddev
->reshape_position
= MaxSector
;
5417 mddev
->external
= 0;
5418 mddev
->persistent
= 0;
5419 mddev
->level
= LEVEL_NONE
;
5420 mddev
->clevel
[0] = 0;
5423 mddev
->metadata_type
[0] = 0;
5424 mddev
->chunk_sectors
= 0;
5425 mddev
->ctime
= mddev
->utime
= 0;
5427 mddev
->max_disks
= 0;
5429 mddev
->can_decrease_events
= 0;
5430 mddev
->delta_disks
= 0;
5431 mddev
->reshape_backwards
= 0;
5432 mddev
->new_level
= LEVEL_NONE
;
5433 mddev
->new_layout
= 0;
5434 mddev
->new_chunk_sectors
= 0;
5435 mddev
->curr_resync
= 0;
5436 atomic64_set(&mddev
->resync_mismatches
, 0);
5437 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5438 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5439 mddev
->recovery
= 0;
5442 mddev
->degraded
= 0;
5443 mddev
->safemode
= 0;
5444 mddev
->private = NULL
;
5445 mddev
->bitmap_info
.offset
= 0;
5446 mddev
->bitmap_info
.default_offset
= 0;
5447 mddev
->bitmap_info
.default_space
= 0;
5448 mddev
->bitmap_info
.chunksize
= 0;
5449 mddev
->bitmap_info
.daemon_sleep
= 0;
5450 mddev
->bitmap_info
.max_write_behind
= 0;
5453 static void __md_stop_writes(struct mddev
*mddev
)
5455 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5456 flush_workqueue(md_misc_wq
);
5457 if (mddev
->sync_thread
) {
5458 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5459 md_reap_sync_thread(mddev
);
5462 del_timer_sync(&mddev
->safemode_timer
);
5464 bitmap_flush(mddev
);
5465 md_super_wait(mddev
);
5467 if (mddev
->ro
== 0 &&
5468 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5469 (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5470 /* mark array as shutdown cleanly */
5471 if (!mddev_is_clustered(mddev
))
5473 md_update_sb(mddev
, 1);
5477 void md_stop_writes(struct mddev
*mddev
)
5479 mddev_lock_nointr(mddev
);
5480 __md_stop_writes(mddev
);
5481 mddev_unlock(mddev
);
5483 EXPORT_SYMBOL_GPL(md_stop_writes
);
5485 static void mddev_detach(struct mddev
*mddev
)
5487 struct bitmap
*bitmap
= mddev
->bitmap
;
5488 /* wait for behind writes to complete */
5489 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5490 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5492 /* need to kick something here to make sure I/O goes? */
5493 wait_event(bitmap
->behind_wait
,
5494 atomic_read(&bitmap
->behind_writes
) == 0);
5496 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5497 mddev
->pers
->quiesce(mddev
, 1);
5498 mddev
->pers
->quiesce(mddev
, 0);
5500 md_unregister_thread(&mddev
->thread
);
5502 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5505 static void __md_stop(struct mddev
*mddev
)
5507 struct md_personality
*pers
= mddev
->pers
;
5508 mddev_detach(mddev
);
5509 /* Ensure ->event_work is done */
5510 flush_workqueue(md_misc_wq
);
5511 spin_lock(&mddev
->lock
);
5514 spin_unlock(&mddev
->lock
);
5515 pers
->free(mddev
, mddev
->private);
5516 mddev
->private = NULL
;
5517 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5518 mddev
->to_remove
= &md_redundancy_group
;
5519 module_put(pers
->owner
);
5520 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5523 void md_stop(struct mddev
*mddev
)
5525 /* stop the array and free an attached data structures.
5526 * This is called from dm-raid
5529 bitmap_destroy(mddev
);
5531 bioset_free(mddev
->bio_set
);
5534 EXPORT_SYMBOL_GPL(md_stop
);
5536 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5541 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5543 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5544 md_wakeup_thread(mddev
->thread
);
5546 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5547 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5548 if (mddev
->sync_thread
)
5549 /* Thread might be blocked waiting for metadata update
5550 * which will now never happen */
5551 wake_up_process(mddev
->sync_thread
->tsk
);
5553 if (mddev
->external
&& test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
5555 mddev_unlock(mddev
);
5556 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5558 wait_event(mddev
->sb_wait
,
5559 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5560 mddev_lock_nointr(mddev
);
5562 mutex_lock(&mddev
->open_mutex
);
5563 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5564 mddev
->sync_thread
||
5565 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5566 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5567 printk("md: %s still in use.\n",mdname(mddev
));
5569 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5570 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5571 md_wakeup_thread(mddev
->thread
);
5577 __md_stop_writes(mddev
);
5583 set_disk_ro(mddev
->gendisk
, 1);
5584 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5585 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5586 md_wakeup_thread(mddev
->thread
);
5587 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5591 mutex_unlock(&mddev
->open_mutex
);
5596 * 0 - completely stop and dis-assemble array
5597 * 2 - stop but do not disassemble array
5599 static int do_md_stop(struct mddev
*mddev
, int mode
,
5600 struct block_device
*bdev
)
5602 struct gendisk
*disk
= mddev
->gendisk
;
5603 struct md_rdev
*rdev
;
5606 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5608 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5609 md_wakeup_thread(mddev
->thread
);
5611 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5612 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5613 if (mddev
->sync_thread
)
5614 /* Thread might be blocked waiting for metadata update
5615 * which will now never happen */
5616 wake_up_process(mddev
->sync_thread
->tsk
);
5618 mddev_unlock(mddev
);
5619 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5620 !test_bit(MD_RECOVERY_RUNNING
,
5621 &mddev
->recovery
)));
5622 mddev_lock_nointr(mddev
);
5624 mutex_lock(&mddev
->open_mutex
);
5625 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5626 mddev
->sysfs_active
||
5627 mddev
->sync_thread
||
5628 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5629 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5630 printk("md: %s still in use.\n",mdname(mddev
));
5631 mutex_unlock(&mddev
->open_mutex
);
5633 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5634 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5635 md_wakeup_thread(mddev
->thread
);
5641 set_disk_ro(disk
, 0);
5643 __md_stop_writes(mddev
);
5645 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5647 /* tell userspace to handle 'inactive' */
5648 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5650 rdev_for_each(rdev
, mddev
)
5651 if (rdev
->raid_disk
>= 0)
5652 sysfs_unlink_rdev(mddev
, rdev
);
5654 set_capacity(disk
, 0);
5655 mutex_unlock(&mddev
->open_mutex
);
5657 revalidate_disk(disk
);
5662 mutex_unlock(&mddev
->open_mutex
);
5664 * Free resources if final stop
5667 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5669 bitmap_destroy(mddev
);
5670 if (mddev
->bitmap_info
.file
) {
5671 struct file
*f
= mddev
->bitmap_info
.file
;
5672 spin_lock(&mddev
->lock
);
5673 mddev
->bitmap_info
.file
= NULL
;
5674 spin_unlock(&mddev
->lock
);
5677 mddev
->bitmap_info
.offset
= 0;
5679 export_array(mddev
);
5682 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5683 if (mddev
->hold_active
== UNTIL_STOP
)
5684 mddev
->hold_active
= 0;
5686 md_new_event(mddev
);
5687 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5692 static void autorun_array(struct mddev
*mddev
)
5694 struct md_rdev
*rdev
;
5697 if (list_empty(&mddev
->disks
))
5700 printk(KERN_INFO
"md: running: ");
5702 rdev_for_each(rdev
, mddev
) {
5703 char b
[BDEVNAME_SIZE
];
5704 printk("<%s>", bdevname(rdev
->bdev
,b
));
5708 err
= do_md_run(mddev
);
5710 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5711 do_md_stop(mddev
, 0, NULL
);
5716 * lets try to run arrays based on all disks that have arrived
5717 * until now. (those are in pending_raid_disks)
5719 * the method: pick the first pending disk, collect all disks with
5720 * the same UUID, remove all from the pending list and put them into
5721 * the 'same_array' list. Then order this list based on superblock
5722 * update time (freshest comes first), kick out 'old' disks and
5723 * compare superblocks. If everything's fine then run it.
5725 * If "unit" is allocated, then bump its reference count
5727 static void autorun_devices(int part
)
5729 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5730 struct mddev
*mddev
;
5731 char b
[BDEVNAME_SIZE
];
5733 printk(KERN_INFO
"md: autorun ...\n");
5734 while (!list_empty(&pending_raid_disks
)) {
5737 LIST_HEAD(candidates
);
5738 rdev0
= list_entry(pending_raid_disks
.next
,
5739 struct md_rdev
, same_set
);
5741 printk(KERN_INFO
"md: considering %s ...\n",
5742 bdevname(rdev0
->bdev
,b
));
5743 INIT_LIST_HEAD(&candidates
);
5744 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5745 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5746 printk(KERN_INFO
"md: adding %s ...\n",
5747 bdevname(rdev
->bdev
,b
));
5748 list_move(&rdev
->same_set
, &candidates
);
5751 * now we have a set of devices, with all of them having
5752 * mostly sane superblocks. It's time to allocate the
5756 dev
= MKDEV(mdp_major
,
5757 rdev0
->preferred_minor
<< MdpMinorShift
);
5758 unit
= MINOR(dev
) >> MdpMinorShift
;
5760 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5763 if (rdev0
->preferred_minor
!= unit
) {
5764 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5765 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5769 md_probe(dev
, NULL
, NULL
);
5770 mddev
= mddev_find(dev
);
5771 if (!mddev
|| !mddev
->gendisk
) {
5775 "md: cannot allocate memory for md drive.\n");
5778 if (mddev_lock(mddev
))
5779 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5781 else if (mddev
->raid_disks
|| mddev
->major_version
5782 || !list_empty(&mddev
->disks
)) {
5784 "md: %s already running, cannot run %s\n",
5785 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5786 mddev_unlock(mddev
);
5788 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5789 mddev
->persistent
= 1;
5790 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5791 list_del_init(&rdev
->same_set
);
5792 if (bind_rdev_to_array(rdev
, mddev
))
5795 autorun_array(mddev
);
5796 mddev_unlock(mddev
);
5798 /* on success, candidates will be empty, on error
5801 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5802 list_del_init(&rdev
->same_set
);
5807 printk(KERN_INFO
"md: ... autorun DONE.\n");
5809 #endif /* !MODULE */
5811 static int get_version(void __user
*arg
)
5815 ver
.major
= MD_MAJOR_VERSION
;
5816 ver
.minor
= MD_MINOR_VERSION
;
5817 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5819 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5825 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5827 mdu_array_info_t info
;
5828 int nr
,working
,insync
,failed
,spare
;
5829 struct md_rdev
*rdev
;
5831 nr
= working
= insync
= failed
= spare
= 0;
5833 rdev_for_each_rcu(rdev
, mddev
) {
5835 if (test_bit(Faulty
, &rdev
->flags
))
5839 if (test_bit(In_sync
, &rdev
->flags
))
5847 info
.major_version
= mddev
->major_version
;
5848 info
.minor_version
= mddev
->minor_version
;
5849 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5850 info
.ctime
= mddev
->ctime
;
5851 info
.level
= mddev
->level
;
5852 info
.size
= mddev
->dev_sectors
/ 2;
5853 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5856 info
.raid_disks
= mddev
->raid_disks
;
5857 info
.md_minor
= mddev
->md_minor
;
5858 info
.not_persistent
= !mddev
->persistent
;
5860 info
.utime
= mddev
->utime
;
5863 info
.state
= (1<<MD_SB_CLEAN
);
5864 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5865 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5866 if (mddev_is_clustered(mddev
))
5867 info
.state
|= (1<<MD_SB_CLUSTERED
);
5868 info
.active_disks
= insync
;
5869 info
.working_disks
= working
;
5870 info
.failed_disks
= failed
;
5871 info
.spare_disks
= spare
;
5873 info
.layout
= mddev
->layout
;
5874 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5876 if (copy_to_user(arg
, &info
, sizeof(info
)))
5882 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5884 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5888 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5893 spin_lock(&mddev
->lock
);
5894 /* bitmap enabled */
5895 if (mddev
->bitmap_info
.file
) {
5896 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5897 sizeof(file
->pathname
));
5901 memmove(file
->pathname
, ptr
,
5902 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5904 spin_unlock(&mddev
->lock
);
5907 copy_to_user(arg
, file
, sizeof(*file
)))
5914 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5916 mdu_disk_info_t info
;
5917 struct md_rdev
*rdev
;
5919 if (copy_from_user(&info
, arg
, sizeof(info
)))
5923 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5925 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5926 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5927 info
.raid_disk
= rdev
->raid_disk
;
5929 if (test_bit(Faulty
, &rdev
->flags
))
5930 info
.state
|= (1<<MD_DISK_FAULTY
);
5931 else if (test_bit(In_sync
, &rdev
->flags
)) {
5932 info
.state
|= (1<<MD_DISK_ACTIVE
);
5933 info
.state
|= (1<<MD_DISK_SYNC
);
5935 if (test_bit(Journal
, &rdev
->flags
))
5936 info
.state
|= (1<<MD_DISK_JOURNAL
);
5937 if (test_bit(WriteMostly
, &rdev
->flags
))
5938 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5940 info
.major
= info
.minor
= 0;
5941 info
.raid_disk
= -1;
5942 info
.state
= (1<<MD_DISK_REMOVED
);
5946 if (copy_to_user(arg
, &info
, sizeof(info
)))
5952 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5954 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5955 struct md_rdev
*rdev
;
5956 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5958 if (mddev_is_clustered(mddev
) &&
5959 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5960 pr_err("%s: Cannot add to clustered mddev.\n",
5965 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5968 if (!mddev
->raid_disks
) {
5970 /* expecting a device which has a superblock */
5971 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5974 "md: md_import_device returned %ld\n",
5976 return PTR_ERR(rdev
);
5978 if (!list_empty(&mddev
->disks
)) {
5979 struct md_rdev
*rdev0
5980 = list_entry(mddev
->disks
.next
,
5981 struct md_rdev
, same_set
);
5982 err
= super_types
[mddev
->major_version
]
5983 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5986 "md: %s has different UUID to %s\n",
5987 bdevname(rdev
->bdev
,b
),
5988 bdevname(rdev0
->bdev
,b2
));
5993 err
= bind_rdev_to_array(rdev
, mddev
);
6000 * add_new_disk can be used once the array is assembled
6001 * to add "hot spares". They must already have a superblock
6006 if (!mddev
->pers
->hot_add_disk
) {
6008 "%s: personality does not support diskops!\n",
6012 if (mddev
->persistent
)
6013 rdev
= md_import_device(dev
, mddev
->major_version
,
6014 mddev
->minor_version
);
6016 rdev
= md_import_device(dev
, -1, -1);
6019 "md: md_import_device returned %ld\n",
6021 return PTR_ERR(rdev
);
6023 /* set saved_raid_disk if appropriate */
6024 if (!mddev
->persistent
) {
6025 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6026 info
->raid_disk
< mddev
->raid_disks
) {
6027 rdev
->raid_disk
= info
->raid_disk
;
6028 set_bit(In_sync
, &rdev
->flags
);
6029 clear_bit(Bitmap_sync
, &rdev
->flags
);
6031 rdev
->raid_disk
= -1;
6032 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6034 super_types
[mddev
->major_version
].
6035 validate_super(mddev
, rdev
);
6036 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6037 rdev
->raid_disk
!= info
->raid_disk
) {
6038 /* This was a hot-add request, but events doesn't
6039 * match, so reject it.
6045 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6046 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6047 set_bit(WriteMostly
, &rdev
->flags
);
6049 clear_bit(WriteMostly
, &rdev
->flags
);
6051 if (info
->state
& (1<<MD_DISK_JOURNAL
))
6052 set_bit(Journal
, &rdev
->flags
);
6054 * check whether the device shows up in other nodes
6056 if (mddev_is_clustered(mddev
)) {
6057 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6058 set_bit(Candidate
, &rdev
->flags
);
6059 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6060 /* --add initiated by this node */
6061 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6069 rdev
->raid_disk
= -1;
6070 err
= bind_rdev_to_array(rdev
, mddev
);
6075 if (mddev_is_clustered(mddev
)) {
6076 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6077 md_cluster_ops
->new_disk_ack(mddev
, (err
== 0));
6080 md_cluster_ops
->add_new_disk_cancel(mddev
);
6082 err
= add_bound_rdev(rdev
);
6086 err
= add_bound_rdev(rdev
);
6091 /* otherwise, add_new_disk is only allowed
6092 * for major_version==0 superblocks
6094 if (mddev
->major_version
!= 0) {
6095 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
6100 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6102 rdev
= md_import_device(dev
, -1, 0);
6105 "md: error, md_import_device() returned %ld\n",
6107 return PTR_ERR(rdev
);
6109 rdev
->desc_nr
= info
->number
;
6110 if (info
->raid_disk
< mddev
->raid_disks
)
6111 rdev
->raid_disk
= info
->raid_disk
;
6113 rdev
->raid_disk
= -1;
6115 if (rdev
->raid_disk
< mddev
->raid_disks
)
6116 if (info
->state
& (1<<MD_DISK_SYNC
))
6117 set_bit(In_sync
, &rdev
->flags
);
6119 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6120 set_bit(WriteMostly
, &rdev
->flags
);
6122 if (!mddev
->persistent
) {
6123 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
6124 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6126 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6127 rdev
->sectors
= rdev
->sb_start
;
6129 err
= bind_rdev_to_array(rdev
, mddev
);
6139 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6141 char b
[BDEVNAME_SIZE
];
6142 struct md_rdev
*rdev
;
6145 rdev
= find_rdev(mddev
, dev
);
6149 if (mddev_is_clustered(mddev
))
6150 ret
= md_cluster_ops
->metadata_update_start(mddev
);
6152 if (rdev
->raid_disk
< 0)
6155 clear_bit(Blocked
, &rdev
->flags
);
6156 remove_and_add_spares(mddev
, rdev
);
6158 if (rdev
->raid_disk
>= 0)
6162 if (mddev_is_clustered(mddev
) && ret
== 0)
6163 md_cluster_ops
->remove_disk(mddev
, rdev
);
6165 md_kick_rdev_from_array(rdev
);
6166 md_update_sb(mddev
, 1);
6167 md_new_event(mddev
);
6171 if (mddev_is_clustered(mddev
) && ret
== 0)
6172 md_cluster_ops
->metadata_update_cancel(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
= get_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
= get_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 mddev
->pers
->quiesce(mddev
, 1);
6616 bitmap_destroy(mddev
);
6617 mddev
->pers
->quiesce(mddev
, 0);
6618 mddev
->bitmap_info
.offset
= 0;
6621 md_update_sb(mddev
, 1);
6627 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6629 struct md_rdev
*rdev
;
6632 if (mddev
->pers
== NULL
)
6636 rdev
= find_rdev_rcu(mddev
, dev
);
6640 md_error(mddev
, rdev
);
6641 if (!test_bit(Faulty
, &rdev
->flags
))
6649 * We have a problem here : there is no easy way to give a CHS
6650 * virtual geometry. We currently pretend that we have a 2 heads
6651 * 4 sectors (with a BIG number of cylinders...). This drives
6652 * dosfs just mad... ;-)
6654 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6656 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6660 geo
->cylinders
= mddev
->array_sectors
/ 8;
6664 static inline bool md_ioctl_valid(unsigned int cmd
)
6669 case GET_ARRAY_INFO
:
6670 case GET_BITMAP_FILE
:
6673 case HOT_REMOVE_DISK
:
6676 case RESTART_ARRAY_RW
:
6678 case SET_ARRAY_INFO
:
6679 case SET_BITMAP_FILE
:
6680 case SET_DISK_FAULTY
:
6683 case CLUSTERED_DISK_NACK
:
6690 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6691 unsigned int cmd
, unsigned long arg
)
6694 void __user
*argp
= (void __user
*)arg
;
6695 struct mddev
*mddev
= NULL
;
6698 if (!md_ioctl_valid(cmd
))
6703 case GET_ARRAY_INFO
:
6707 if (!capable(CAP_SYS_ADMIN
))
6712 * Commands dealing with the RAID driver but not any
6717 err
= get_version(argp
);
6723 autostart_arrays(arg
);
6730 * Commands creating/starting a new array:
6733 mddev
= bdev
->bd_disk
->private_data
;
6740 /* Some actions do not requires the mutex */
6742 case GET_ARRAY_INFO
:
6743 if (!mddev
->raid_disks
&& !mddev
->external
)
6746 err
= get_array_info(mddev
, argp
);
6750 if (!mddev
->raid_disks
&& !mddev
->external
)
6753 err
= get_disk_info(mddev
, argp
);
6756 case SET_DISK_FAULTY
:
6757 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6760 case GET_BITMAP_FILE
:
6761 err
= get_bitmap_file(mddev
, argp
);
6766 if (cmd
== ADD_NEW_DISK
)
6767 /* need to ensure md_delayed_delete() has completed */
6768 flush_workqueue(md_misc_wq
);
6770 if (cmd
== HOT_REMOVE_DISK
)
6771 /* need to ensure recovery thread has run */
6772 wait_event_interruptible_timeout(mddev
->sb_wait
,
6773 !test_bit(MD_RECOVERY_NEEDED
,
6775 msecs_to_jiffies(5000));
6776 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6777 /* Need to flush page cache, and ensure no-one else opens
6780 mutex_lock(&mddev
->open_mutex
);
6781 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6782 mutex_unlock(&mddev
->open_mutex
);
6786 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6787 mutex_unlock(&mddev
->open_mutex
);
6788 sync_blockdev(bdev
);
6790 err
= mddev_lock(mddev
);
6793 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6798 if (cmd
== SET_ARRAY_INFO
) {
6799 mdu_array_info_t info
;
6801 memset(&info
, 0, sizeof(info
));
6802 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6807 err
= update_array_info(mddev
, &info
);
6809 printk(KERN_WARNING
"md: couldn't update"
6810 " array info. %d\n", err
);
6815 if (!list_empty(&mddev
->disks
)) {
6817 "md: array %s already has disks!\n",
6822 if (mddev
->raid_disks
) {
6824 "md: array %s already initialised!\n",
6829 err
= set_array_info(mddev
, &info
);
6831 printk(KERN_WARNING
"md: couldn't set"
6832 " array info. %d\n", err
);
6839 * Commands querying/configuring an existing array:
6841 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6842 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6843 if ((!mddev
->raid_disks
&& !mddev
->external
)
6844 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6845 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6846 && cmd
!= GET_BITMAP_FILE
) {
6852 * Commands even a read-only array can execute:
6855 case RESTART_ARRAY_RW
:
6856 err
= restart_array(mddev
);
6860 err
= do_md_stop(mddev
, 0, bdev
);
6864 err
= md_set_readonly(mddev
, bdev
);
6867 case HOT_REMOVE_DISK
:
6868 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6872 /* We can support ADD_NEW_DISK on read-only arrays
6873 * on if we are re-adding a preexisting device.
6874 * So require mddev->pers and MD_DISK_SYNC.
6877 mdu_disk_info_t info
;
6878 if (copy_from_user(&info
, argp
, sizeof(info
)))
6880 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6881 /* Need to clear read-only for this */
6884 err
= add_new_disk(mddev
, &info
);
6890 if (get_user(ro
, (int __user
*)(arg
))) {
6896 /* if the bdev is going readonly the value of mddev->ro
6897 * does not matter, no writes are coming
6902 /* are we are already prepared for writes? */
6906 /* transitioning to readauto need only happen for
6907 * arrays that call md_write_start
6910 err
= restart_array(mddev
);
6913 set_disk_ro(mddev
->gendisk
, 0);
6920 * The remaining ioctls are changing the state of the
6921 * superblock, so we do not allow them on read-only arrays.
6923 if (mddev
->ro
&& mddev
->pers
) {
6924 if (mddev
->ro
== 2) {
6926 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6927 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6928 /* mddev_unlock will wake thread */
6929 /* If a device failed while we were read-only, we
6930 * need to make sure the metadata is updated now.
6932 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6933 mddev_unlock(mddev
);
6934 wait_event(mddev
->sb_wait
,
6935 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6936 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6937 mddev_lock_nointr(mddev
);
6948 mdu_disk_info_t info
;
6949 if (copy_from_user(&info
, argp
, sizeof(info
)))
6952 err
= add_new_disk(mddev
, &info
);
6956 case CLUSTERED_DISK_NACK
:
6957 if (mddev_is_clustered(mddev
))
6958 md_cluster_ops
->new_disk_ack(mddev
, false);
6964 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6968 err
= do_md_run(mddev
);
6971 case SET_BITMAP_FILE
:
6972 err
= set_bitmap_file(mddev
, (int)arg
);
6981 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6983 mddev
->hold_active
= 0;
6984 mddev_unlock(mddev
);
6988 #ifdef CONFIG_COMPAT
6989 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6990 unsigned int cmd
, unsigned long arg
)
6993 case HOT_REMOVE_DISK
:
6995 case SET_DISK_FAULTY
:
6996 case SET_BITMAP_FILE
:
6997 /* These take in integer arg, do not convert */
7000 arg
= (unsigned long)compat_ptr(arg
);
7004 return md_ioctl(bdev
, mode
, cmd
, arg
);
7006 #endif /* CONFIG_COMPAT */
7008 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7011 * Succeed if we can lock the mddev, which confirms that
7012 * it isn't being stopped right now.
7014 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7020 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7021 /* we are racing with mddev_put which is discarding this
7025 /* Wait until bdev->bd_disk is definitely gone */
7026 flush_workqueue(md_misc_wq
);
7027 /* Then retry the open from the top */
7028 return -ERESTARTSYS
;
7030 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7032 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7036 atomic_inc(&mddev
->openers
);
7037 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
7038 mutex_unlock(&mddev
->open_mutex
);
7040 check_disk_change(bdev
);
7045 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7047 struct mddev
*mddev
= disk
->private_data
;
7050 atomic_dec(&mddev
->openers
);
7054 static int md_media_changed(struct gendisk
*disk
)
7056 struct mddev
*mddev
= disk
->private_data
;
7058 return mddev
->changed
;
7061 static int md_revalidate(struct gendisk
*disk
)
7063 struct mddev
*mddev
= disk
->private_data
;
7068 static const struct block_device_operations md_fops
=
7070 .owner
= THIS_MODULE
,
7072 .release
= md_release
,
7074 #ifdef CONFIG_COMPAT
7075 .compat_ioctl
= md_compat_ioctl
,
7077 .getgeo
= md_getgeo
,
7078 .media_changed
= md_media_changed
,
7079 .revalidate_disk
= md_revalidate
,
7082 static int md_thread(void *arg
)
7084 struct md_thread
*thread
= arg
;
7087 * md_thread is a 'system-thread', it's priority should be very
7088 * high. We avoid resource deadlocks individually in each
7089 * raid personality. (RAID5 does preallocation) We also use RR and
7090 * the very same RT priority as kswapd, thus we will never get
7091 * into a priority inversion deadlock.
7093 * we definitely have to have equal or higher priority than
7094 * bdflush, otherwise bdflush will deadlock if there are too
7095 * many dirty RAID5 blocks.
7098 allow_signal(SIGKILL
);
7099 while (!kthread_should_stop()) {
7101 /* We need to wait INTERRUPTIBLE so that
7102 * we don't add to the load-average.
7103 * That means we need to be sure no signals are
7106 if (signal_pending(current
))
7107 flush_signals(current
);
7109 wait_event_interruptible_timeout
7111 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7112 || kthread_should_stop(),
7115 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7116 if (!kthread_should_stop())
7117 thread
->run(thread
);
7123 void md_wakeup_thread(struct md_thread
*thread
)
7126 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7127 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7128 wake_up(&thread
->wqueue
);
7131 EXPORT_SYMBOL(md_wakeup_thread
);
7133 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7134 struct mddev
*mddev
, const char *name
)
7136 struct md_thread
*thread
;
7138 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7142 init_waitqueue_head(&thread
->wqueue
);
7145 thread
->mddev
= mddev
;
7146 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7147 thread
->tsk
= kthread_run(md_thread
, thread
,
7149 mdname(thread
->mddev
),
7151 if (IS_ERR(thread
->tsk
)) {
7157 EXPORT_SYMBOL(md_register_thread
);
7159 void md_unregister_thread(struct md_thread
**threadp
)
7161 struct md_thread
*thread
= *threadp
;
7164 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7165 /* Locking ensures that mddev_unlock does not wake_up a
7166 * non-existent thread
7168 spin_lock(&pers_lock
);
7170 spin_unlock(&pers_lock
);
7172 kthread_stop(thread
->tsk
);
7175 EXPORT_SYMBOL(md_unregister_thread
);
7177 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7179 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7182 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7184 mddev
->pers
->error_handler(mddev
,rdev
);
7185 if (mddev
->degraded
)
7186 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7187 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7188 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7189 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7190 md_wakeup_thread(mddev
->thread
);
7191 if (mddev
->event_work
.func
)
7192 queue_work(md_misc_wq
, &mddev
->event_work
);
7193 md_new_event_inintr(mddev
);
7195 EXPORT_SYMBOL(md_error
);
7197 /* seq_file implementation /proc/mdstat */
7199 static void status_unused(struct seq_file
*seq
)
7202 struct md_rdev
*rdev
;
7204 seq_printf(seq
, "unused devices: ");
7206 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7207 char b
[BDEVNAME_SIZE
];
7209 seq_printf(seq
, "%s ",
7210 bdevname(rdev
->bdev
,b
));
7213 seq_printf(seq
, "<none>");
7215 seq_printf(seq
, "\n");
7218 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7220 sector_t max_sectors
, resync
, res
;
7221 unsigned long dt
, db
;
7224 unsigned int per_milli
;
7226 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7227 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7228 max_sectors
= mddev
->resync_max_sectors
;
7230 max_sectors
= mddev
->dev_sectors
;
7232 resync
= mddev
->curr_resync
;
7234 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7235 /* Still cleaning up */
7236 resync
= max_sectors
;
7238 resync
-= atomic_read(&mddev
->recovery_active
);
7241 if (mddev
->recovery_cp
< MaxSector
) {
7242 seq_printf(seq
, "\tresync=PENDING");
7248 seq_printf(seq
, "\tresync=DELAYED");
7252 WARN_ON(max_sectors
== 0);
7253 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7254 * in a sector_t, and (max_sectors>>scale) will fit in a
7255 * u32, as those are the requirements for sector_div.
7256 * Thus 'scale' must be at least 10
7259 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7260 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7263 res
= (resync
>>scale
)*1000;
7264 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7268 int i
, x
= per_milli
/50, y
= 20-x
;
7269 seq_printf(seq
, "[");
7270 for (i
= 0; i
< x
; i
++)
7271 seq_printf(seq
, "=");
7272 seq_printf(seq
, ">");
7273 for (i
= 0; i
< y
; i
++)
7274 seq_printf(seq
, ".");
7275 seq_printf(seq
, "] ");
7277 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7278 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7280 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7282 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7283 "resync" : "recovery"))),
7284 per_milli
/10, per_milli
% 10,
7285 (unsigned long long) resync
/2,
7286 (unsigned long long) max_sectors
/2);
7289 * dt: time from mark until now
7290 * db: blocks written from mark until now
7291 * rt: remaining time
7293 * rt is a sector_t, so could be 32bit or 64bit.
7294 * So we divide before multiply in case it is 32bit and close
7296 * We scale the divisor (db) by 32 to avoid losing precision
7297 * near the end of resync when the number of remaining sectors
7299 * We then divide rt by 32 after multiplying by db to compensate.
7300 * The '+1' avoids division by zero if db is very small.
7302 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7304 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7305 - mddev
->resync_mark_cnt
;
7307 rt
= max_sectors
- resync
; /* number of remaining sectors */
7308 sector_div(rt
, db
/32+1);
7312 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7313 ((unsigned long)rt
% 60)/6);
7315 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7319 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7321 struct list_head
*tmp
;
7323 struct mddev
*mddev
;
7331 spin_lock(&all_mddevs_lock
);
7332 list_for_each(tmp
,&all_mddevs
)
7334 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7336 spin_unlock(&all_mddevs_lock
);
7339 spin_unlock(&all_mddevs_lock
);
7341 return (void*)2;/* tail */
7345 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7347 struct list_head
*tmp
;
7348 struct mddev
*next_mddev
, *mddev
= v
;
7354 spin_lock(&all_mddevs_lock
);
7356 tmp
= all_mddevs
.next
;
7358 tmp
= mddev
->all_mddevs
.next
;
7359 if (tmp
!= &all_mddevs
)
7360 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7362 next_mddev
= (void*)2;
7365 spin_unlock(&all_mddevs_lock
);
7373 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7375 struct mddev
*mddev
= v
;
7377 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7381 static int md_seq_show(struct seq_file
*seq
, void *v
)
7383 struct mddev
*mddev
= v
;
7385 struct md_rdev
*rdev
;
7387 if (v
== (void*)1) {
7388 struct md_personality
*pers
;
7389 seq_printf(seq
, "Personalities : ");
7390 spin_lock(&pers_lock
);
7391 list_for_each_entry(pers
, &pers_list
, list
)
7392 seq_printf(seq
, "[%s] ", pers
->name
);
7394 spin_unlock(&pers_lock
);
7395 seq_printf(seq
, "\n");
7396 seq
->poll_event
= atomic_read(&md_event_count
);
7399 if (v
== (void*)2) {
7404 spin_lock(&mddev
->lock
);
7405 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7406 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7407 mddev
->pers
? "" : "in");
7410 seq_printf(seq
, " (read-only)");
7412 seq_printf(seq
, " (auto-read-only)");
7413 seq_printf(seq
, " %s", mddev
->pers
->name
);
7418 rdev_for_each_rcu(rdev
, mddev
) {
7419 char b
[BDEVNAME_SIZE
];
7420 seq_printf(seq
, " %s[%d]",
7421 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7422 if (test_bit(WriteMostly
, &rdev
->flags
))
7423 seq_printf(seq
, "(W)");
7424 if (test_bit(Journal
, &rdev
->flags
))
7425 seq_printf(seq
, "(J)");
7426 if (test_bit(Faulty
, &rdev
->flags
)) {
7427 seq_printf(seq
, "(F)");
7430 if (rdev
->raid_disk
< 0)
7431 seq_printf(seq
, "(S)"); /* spare */
7432 if (test_bit(Replacement
, &rdev
->flags
))
7433 seq_printf(seq
, "(R)");
7434 sectors
+= rdev
->sectors
;
7438 if (!list_empty(&mddev
->disks
)) {
7440 seq_printf(seq
, "\n %llu blocks",
7441 (unsigned long long)
7442 mddev
->array_sectors
/ 2);
7444 seq_printf(seq
, "\n %llu blocks",
7445 (unsigned long long)sectors
/ 2);
7447 if (mddev
->persistent
) {
7448 if (mddev
->major_version
!= 0 ||
7449 mddev
->minor_version
!= 90) {
7450 seq_printf(seq
," super %d.%d",
7451 mddev
->major_version
,
7452 mddev
->minor_version
);
7454 } else if (mddev
->external
)
7455 seq_printf(seq
, " super external:%s",
7456 mddev
->metadata_type
);
7458 seq_printf(seq
, " super non-persistent");
7461 mddev
->pers
->status(seq
, mddev
);
7462 seq_printf(seq
, "\n ");
7463 if (mddev
->pers
->sync_request
) {
7464 if (status_resync(seq
, mddev
))
7465 seq_printf(seq
, "\n ");
7468 seq_printf(seq
, "\n ");
7470 bitmap_status(seq
, mddev
->bitmap
);
7472 seq_printf(seq
, "\n");
7474 spin_unlock(&mddev
->lock
);
7479 static const struct seq_operations md_seq_ops
= {
7480 .start
= md_seq_start
,
7481 .next
= md_seq_next
,
7482 .stop
= md_seq_stop
,
7483 .show
= md_seq_show
,
7486 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7488 struct seq_file
*seq
;
7491 error
= seq_open(file
, &md_seq_ops
);
7495 seq
= file
->private_data
;
7496 seq
->poll_event
= atomic_read(&md_event_count
);
7500 static int md_unloading
;
7501 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7503 struct seq_file
*seq
= filp
->private_data
;
7507 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7508 poll_wait(filp
, &md_event_waiters
, wait
);
7510 /* always allow read */
7511 mask
= POLLIN
| POLLRDNORM
;
7513 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7514 mask
|= POLLERR
| POLLPRI
;
7518 static const struct file_operations md_seq_fops
= {
7519 .owner
= THIS_MODULE
,
7520 .open
= md_seq_open
,
7522 .llseek
= seq_lseek
,
7523 .release
= seq_release_private
,
7524 .poll
= mdstat_poll
,
7527 int register_md_personality(struct md_personality
*p
)
7529 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7531 spin_lock(&pers_lock
);
7532 list_add_tail(&p
->list
, &pers_list
);
7533 spin_unlock(&pers_lock
);
7536 EXPORT_SYMBOL(register_md_personality
);
7538 int unregister_md_personality(struct md_personality
*p
)
7540 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7541 spin_lock(&pers_lock
);
7542 list_del_init(&p
->list
);
7543 spin_unlock(&pers_lock
);
7546 EXPORT_SYMBOL(unregister_md_personality
);
7548 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7549 struct module
*module
)
7552 spin_lock(&pers_lock
);
7553 if (md_cluster_ops
!= NULL
)
7556 md_cluster_ops
= ops
;
7557 md_cluster_mod
= module
;
7559 spin_unlock(&pers_lock
);
7562 EXPORT_SYMBOL(register_md_cluster_operations
);
7564 int unregister_md_cluster_operations(void)
7566 spin_lock(&pers_lock
);
7567 md_cluster_ops
= NULL
;
7568 spin_unlock(&pers_lock
);
7571 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7573 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7575 if (!md_cluster_ops
)
7576 request_module("md-cluster");
7577 spin_lock(&pers_lock
);
7578 /* ensure module won't be unloaded */
7579 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7580 pr_err("can't find md-cluster module or get it's reference.\n");
7581 spin_unlock(&pers_lock
);
7584 spin_unlock(&pers_lock
);
7586 return md_cluster_ops
->join(mddev
, nodes
);
7589 void md_cluster_stop(struct mddev
*mddev
)
7591 if (!md_cluster_ops
)
7593 md_cluster_ops
->leave(mddev
);
7594 module_put(md_cluster_mod
);
7597 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7599 struct md_rdev
*rdev
;
7605 rdev_for_each_rcu(rdev
, mddev
) {
7606 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7607 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7608 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7609 atomic_read(&disk
->sync_io
);
7610 /* sync IO will cause sync_io to increase before the disk_stats
7611 * as sync_io is counted when a request starts, and
7612 * disk_stats is counted when it completes.
7613 * So resync activity will cause curr_events to be smaller than
7614 * when there was no such activity.
7615 * non-sync IO will cause disk_stat to increase without
7616 * increasing sync_io so curr_events will (eventually)
7617 * be larger than it was before. Once it becomes
7618 * substantially larger, the test below will cause
7619 * the array to appear non-idle, and resync will slow
7621 * If there is a lot of outstanding resync activity when
7622 * we set last_event to curr_events, then all that activity
7623 * completing might cause the array to appear non-idle
7624 * and resync will be slowed down even though there might
7625 * not have been non-resync activity. This will only
7626 * happen once though. 'last_events' will soon reflect
7627 * the state where there is little or no outstanding
7628 * resync requests, and further resync activity will
7629 * always make curr_events less than last_events.
7632 if (init
|| curr_events
- rdev
->last_events
> 64) {
7633 rdev
->last_events
= curr_events
;
7641 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7643 /* another "blocks" (512byte) blocks have been synced */
7644 atomic_sub(blocks
, &mddev
->recovery_active
);
7645 wake_up(&mddev
->recovery_wait
);
7647 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7648 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7649 md_wakeup_thread(mddev
->thread
);
7650 // stop recovery, signal do_sync ....
7653 EXPORT_SYMBOL(md_done_sync
);
7655 /* md_write_start(mddev, bi)
7656 * If we need to update some array metadata (e.g. 'active' flag
7657 * in superblock) before writing, schedule a superblock update
7658 * and wait for it to complete.
7660 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7663 if (bio_data_dir(bi
) != WRITE
)
7666 BUG_ON(mddev
->ro
== 1);
7667 if (mddev
->ro
== 2) {
7668 /* need to switch to read/write */
7670 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7671 md_wakeup_thread(mddev
->thread
);
7672 md_wakeup_thread(mddev
->sync_thread
);
7675 atomic_inc(&mddev
->writes_pending
);
7676 if (mddev
->safemode
== 1)
7677 mddev
->safemode
= 0;
7678 if (mddev
->in_sync
) {
7679 spin_lock(&mddev
->lock
);
7680 if (mddev
->in_sync
) {
7682 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7683 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7684 md_wakeup_thread(mddev
->thread
);
7687 spin_unlock(&mddev
->lock
);
7690 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7691 wait_event(mddev
->sb_wait
,
7692 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7694 EXPORT_SYMBOL(md_write_start
);
7696 void md_write_end(struct mddev
*mddev
)
7698 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7699 if (mddev
->safemode
== 2)
7700 md_wakeup_thread(mddev
->thread
);
7701 else if (mddev
->safemode_delay
)
7702 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7705 EXPORT_SYMBOL(md_write_end
);
7707 /* md_allow_write(mddev)
7708 * Calling this ensures that the array is marked 'active' so that writes
7709 * may proceed without blocking. It is important to call this before
7710 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7711 * Must be called with mddev_lock held.
7713 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7714 * is dropped, so return -EAGAIN after notifying userspace.
7716 int md_allow_write(struct mddev
*mddev
)
7722 if (!mddev
->pers
->sync_request
)
7725 spin_lock(&mddev
->lock
);
7726 if (mddev
->in_sync
) {
7728 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7729 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7730 if (mddev
->safemode_delay
&&
7731 mddev
->safemode
== 0)
7732 mddev
->safemode
= 1;
7733 spin_unlock(&mddev
->lock
);
7734 md_update_sb(mddev
, 0);
7735 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7737 spin_unlock(&mddev
->lock
);
7739 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7744 EXPORT_SYMBOL_GPL(md_allow_write
);
7746 #define SYNC_MARKS 10
7747 #define SYNC_MARK_STEP (3*HZ)
7748 #define UPDATE_FREQUENCY (5*60*HZ)
7749 void md_do_sync(struct md_thread
*thread
)
7751 struct mddev
*mddev
= thread
->mddev
;
7752 struct mddev
*mddev2
;
7753 unsigned int currspeed
= 0,
7755 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7756 unsigned long mark
[SYNC_MARKS
];
7757 unsigned long update_time
;
7758 sector_t mark_cnt
[SYNC_MARKS
];
7760 struct list_head
*tmp
;
7761 sector_t last_check
;
7763 struct md_rdev
*rdev
;
7764 char *desc
, *action
= NULL
;
7765 struct blk_plug plug
;
7766 bool cluster_resync_finished
= false;
7768 /* just incase thread restarts... */
7769 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7771 if (mddev
->ro
) {/* never try to sync a read-only array */
7772 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7776 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7777 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7778 desc
= "data-check";
7780 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7781 desc
= "requested-resync";
7785 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7790 mddev
->last_sync_action
= action
?: desc
;
7792 /* we overload curr_resync somewhat here.
7793 * 0 == not engaged in resync at all
7794 * 2 == checking that there is no conflict with another sync
7795 * 1 == like 2, but have yielded to allow conflicting resync to
7797 * other == active in resync - this many blocks
7799 * Before starting a resync we must have set curr_resync to
7800 * 2, and then checked that every "conflicting" array has curr_resync
7801 * less than ours. When we find one that is the same or higher
7802 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7803 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7804 * This will mean we have to start checking from the beginning again.
7809 mddev
->curr_resync
= 2;
7812 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7814 for_each_mddev(mddev2
, tmp
) {
7815 if (mddev2
== mddev
)
7817 if (!mddev
->parallel_resync
7818 && mddev2
->curr_resync
7819 && match_mddev_units(mddev
, mddev2
)) {
7821 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7822 /* arbitrarily yield */
7823 mddev
->curr_resync
= 1;
7824 wake_up(&resync_wait
);
7826 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7827 /* no need to wait here, we can wait the next
7828 * time 'round when curr_resync == 2
7831 /* We need to wait 'interruptible' so as not to
7832 * contribute to the load average, and not to
7833 * be caught by 'softlockup'
7835 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7836 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7837 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7838 printk(KERN_INFO
"md: delaying %s of %s"
7839 " until %s has finished (they"
7840 " share one or more physical units)\n",
7841 desc
, mdname(mddev
), mdname(mddev2
));
7843 if (signal_pending(current
))
7844 flush_signals(current
);
7846 finish_wait(&resync_wait
, &wq
);
7849 finish_wait(&resync_wait
, &wq
);
7852 } while (mddev
->curr_resync
< 2);
7855 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7856 /* resync follows the size requested by the personality,
7857 * which defaults to physical size, but can be virtual size
7859 max_sectors
= mddev
->resync_max_sectors
;
7860 atomic64_set(&mddev
->resync_mismatches
, 0);
7861 /* we don't use the checkpoint if there's a bitmap */
7862 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7863 j
= mddev
->resync_min
;
7864 else if (!mddev
->bitmap
)
7865 j
= mddev
->recovery_cp
;
7867 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7868 max_sectors
= mddev
->resync_max_sectors
;
7870 /* recovery follows the physical size of devices */
7871 max_sectors
= mddev
->dev_sectors
;
7874 rdev_for_each_rcu(rdev
, mddev
)
7875 if (rdev
->raid_disk
>= 0 &&
7876 !test_bit(Journal
, &rdev
->flags
) &&
7877 !test_bit(Faulty
, &rdev
->flags
) &&
7878 !test_bit(In_sync
, &rdev
->flags
) &&
7879 rdev
->recovery_offset
< j
)
7880 j
= rdev
->recovery_offset
;
7883 /* If there is a bitmap, we need to make sure all
7884 * writes that started before we added a spare
7885 * complete before we start doing a recovery.
7886 * Otherwise the write might complete and (via
7887 * bitmap_endwrite) set a bit in the bitmap after the
7888 * recovery has checked that bit and skipped that
7891 if (mddev
->bitmap
) {
7892 mddev
->pers
->quiesce(mddev
, 1);
7893 mddev
->pers
->quiesce(mddev
, 0);
7897 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7898 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7899 " %d KB/sec/disk.\n", speed_min(mddev
));
7900 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7901 "(but not more than %d KB/sec) for %s.\n",
7902 speed_max(mddev
), desc
);
7904 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7907 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7909 mark_cnt
[m
] = io_sectors
;
7912 mddev
->resync_mark
= mark
[last_mark
];
7913 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7916 * Tune reconstruction:
7918 window
= 32*(PAGE_SIZE
/512);
7919 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7920 window
/2, (unsigned long long)max_sectors
/2);
7922 atomic_set(&mddev
->recovery_active
, 0);
7927 "md: resuming %s of %s from checkpoint.\n",
7928 desc
, mdname(mddev
));
7929 mddev
->curr_resync
= j
;
7931 mddev
->curr_resync
= 3; /* no longer delayed */
7932 mddev
->curr_resync_completed
= j
;
7933 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7934 md_new_event(mddev
);
7935 update_time
= jiffies
;
7937 blk_start_plug(&plug
);
7938 while (j
< max_sectors
) {
7943 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7944 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7945 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7946 > (max_sectors
>> 4)) ||
7947 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7948 (j
- mddev
->curr_resync_completed
)*2
7949 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
7950 mddev
->curr_resync_completed
> mddev
->resync_max
7952 /* time to update curr_resync_completed */
7953 wait_event(mddev
->recovery_wait
,
7954 atomic_read(&mddev
->recovery_active
) == 0);
7955 mddev
->curr_resync_completed
= j
;
7956 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7957 j
> mddev
->recovery_cp
)
7958 mddev
->recovery_cp
= j
;
7959 update_time
= jiffies
;
7960 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7961 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7964 while (j
>= mddev
->resync_max
&&
7965 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7966 /* As this condition is controlled by user-space,
7967 * we can block indefinitely, so use '_interruptible'
7968 * to avoid triggering warnings.
7970 flush_signals(current
); /* just in case */
7971 wait_event_interruptible(mddev
->recovery_wait
,
7972 mddev
->resync_max
> j
7973 || test_bit(MD_RECOVERY_INTR
,
7977 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7980 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
7982 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7986 if (!skipped
) { /* actual IO requested */
7987 io_sectors
+= sectors
;
7988 atomic_add(sectors
, &mddev
->recovery_active
);
7991 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7995 if (j
> max_sectors
)
7996 /* when skipping, extra large numbers can be returned. */
7999 mddev
->curr_resync
= j
;
8000 mddev
->curr_mark_cnt
= io_sectors
;
8001 if (last_check
== 0)
8002 /* this is the earliest that rebuild will be
8003 * visible in /proc/mdstat
8005 md_new_event(mddev
);
8007 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8010 last_check
= io_sectors
;
8012 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8014 int next
= (last_mark
+1) % SYNC_MARKS
;
8016 mddev
->resync_mark
= mark
[next
];
8017 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8018 mark
[next
] = jiffies
;
8019 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8023 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8027 * this loop exits only if either when we are slower than
8028 * the 'hard' speed limit, or the system was IO-idle for
8030 * the system might be non-idle CPU-wise, but we only care
8031 * about not overloading the IO subsystem. (things like an
8032 * e2fsck being done on the RAID array should execute fast)
8036 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8037 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8038 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8040 if (currspeed
> speed_min(mddev
)) {
8041 if (currspeed
> speed_max(mddev
)) {
8045 if (!is_mddev_idle(mddev
, 0)) {
8047 * Give other IO more of a chance.
8048 * The faster the devices, the less we wait.
8050 wait_event(mddev
->recovery_wait
,
8051 !atomic_read(&mddev
->recovery_active
));
8055 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
8056 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8057 ? "interrupted" : "done");
8059 * this also signals 'finished resyncing' to md_stop
8061 blk_finish_plug(&plug
);
8062 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8064 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8065 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8066 mddev
->curr_resync
> 2) {
8067 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8068 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8070 /* tell personality and other nodes that we are finished */
8071 if (mddev_is_clustered(mddev
)) {
8072 md_cluster_ops
->resync_finish(mddev
);
8073 cluster_resync_finished
= true;
8075 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8077 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8078 mddev
->curr_resync
> 2) {
8079 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8080 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8081 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8083 "md: checkpointing %s of %s.\n",
8084 desc
, mdname(mddev
));
8085 if (test_bit(MD_RECOVERY_ERROR
,
8087 mddev
->recovery_cp
=
8088 mddev
->curr_resync_completed
;
8090 mddev
->recovery_cp
=
8094 mddev
->recovery_cp
= MaxSector
;
8096 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8097 mddev
->curr_resync
= MaxSector
;
8099 rdev_for_each_rcu(rdev
, mddev
)
8100 if (rdev
->raid_disk
>= 0 &&
8101 mddev
->delta_disks
>= 0 &&
8102 !test_bit(Journal
, &rdev
->flags
) &&
8103 !test_bit(Faulty
, &rdev
->flags
) &&
8104 !test_bit(In_sync
, &rdev
->flags
) &&
8105 rdev
->recovery_offset
< mddev
->curr_resync
)
8106 rdev
->recovery_offset
= mddev
->curr_resync
;
8111 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8113 if (mddev_is_clustered(mddev
) &&
8114 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8115 !cluster_resync_finished
)
8116 md_cluster_ops
->resync_finish(mddev
);
8118 spin_lock(&mddev
->lock
);
8119 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8120 /* We completed so min/max setting can be forgotten if used. */
8121 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8122 mddev
->resync_min
= 0;
8123 mddev
->resync_max
= MaxSector
;
8124 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8125 mddev
->resync_min
= mddev
->curr_resync_completed
;
8126 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8127 mddev
->curr_resync
= 0;
8128 spin_unlock(&mddev
->lock
);
8130 wake_up(&resync_wait
);
8131 md_wakeup_thread(mddev
->thread
);
8134 EXPORT_SYMBOL_GPL(md_do_sync
);
8136 static int remove_and_add_spares(struct mddev
*mddev
,
8137 struct md_rdev
*this)
8139 struct md_rdev
*rdev
;
8143 rdev_for_each(rdev
, mddev
)
8144 if ((this == NULL
|| rdev
== this) &&
8145 rdev
->raid_disk
>= 0 &&
8146 !test_bit(Blocked
, &rdev
->flags
) &&
8147 (test_bit(Faulty
, &rdev
->flags
) ||
8148 (!test_bit(In_sync
, &rdev
->flags
) &&
8149 !test_bit(Journal
, &rdev
->flags
))) &&
8150 atomic_read(&rdev
->nr_pending
)==0) {
8151 if (mddev
->pers
->hot_remove_disk(
8152 mddev
, rdev
) == 0) {
8153 sysfs_unlink_rdev(mddev
, rdev
);
8154 rdev
->raid_disk
= -1;
8158 if (removed
&& mddev
->kobj
.sd
)
8159 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8161 if (this && removed
)
8164 rdev_for_each(rdev
, mddev
) {
8165 if (this && this != rdev
)
8167 if (test_bit(Candidate
, &rdev
->flags
))
8169 if (rdev
->raid_disk
>= 0 &&
8170 !test_bit(In_sync
, &rdev
->flags
) &&
8171 !test_bit(Journal
, &rdev
->flags
) &&
8172 !test_bit(Faulty
, &rdev
->flags
))
8174 if (rdev
->raid_disk
>= 0)
8176 if (test_bit(Faulty
, &rdev
->flags
))
8178 if (test_bit(Journal
, &rdev
->flags
))
8181 ! (rdev
->saved_raid_disk
>= 0 &&
8182 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8185 rdev
->recovery_offset
= 0;
8187 hot_add_disk(mddev
, rdev
) == 0) {
8188 if (sysfs_link_rdev(mddev
, rdev
))
8189 /* failure here is OK */;
8191 md_new_event(mddev
);
8192 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8197 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8201 static void md_start_sync(struct work_struct
*ws
)
8203 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8206 if (mddev_is_clustered(mddev
)) {
8207 ret
= md_cluster_ops
->resync_start(mddev
);
8209 mddev
->sync_thread
= NULL
;
8214 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8218 if (!mddev
->sync_thread
) {
8219 if (!(mddev_is_clustered(mddev
) && ret
== -EAGAIN
))
8220 printk(KERN_ERR
"%s: could not start resync"
8223 /* leave the spares where they are, it shouldn't hurt */
8224 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8225 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8226 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8227 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8228 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8229 wake_up(&resync_wait
);
8230 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8232 if (mddev
->sysfs_action
)
8233 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8235 md_wakeup_thread(mddev
->sync_thread
);
8236 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8237 md_new_event(mddev
);
8241 * This routine is regularly called by all per-raid-array threads to
8242 * deal with generic issues like resync and super-block update.
8243 * Raid personalities that don't have a thread (linear/raid0) do not
8244 * need this as they never do any recovery or update the superblock.
8246 * It does not do any resync itself, but rather "forks" off other threads
8247 * to do that as needed.
8248 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8249 * "->recovery" and create a thread at ->sync_thread.
8250 * When the thread finishes it sets MD_RECOVERY_DONE
8251 * and wakeups up this thread which will reap the thread and finish up.
8252 * This thread also removes any faulty devices (with nr_pending == 0).
8254 * The overall approach is:
8255 * 1/ if the superblock needs updating, update it.
8256 * 2/ If a recovery thread is running, don't do anything else.
8257 * 3/ If recovery has finished, clean up, possibly marking spares active.
8258 * 4/ If there are any faulty devices, remove them.
8259 * 5/ If array is degraded, try to add spares devices
8260 * 6/ If array has spares or is not in-sync, start a resync thread.
8262 void md_check_recovery(struct mddev
*mddev
)
8264 if (mddev
->suspended
)
8268 bitmap_daemon_work(mddev
);
8270 if (signal_pending(current
)) {
8271 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8272 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8274 mddev
->safemode
= 2;
8276 flush_signals(current
);
8279 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8282 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8283 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8284 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8285 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8286 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8287 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8291 if (mddev_trylock(mddev
)) {
8295 struct md_rdev
*rdev
;
8296 if (!mddev
->external
&& mddev
->in_sync
)
8297 /* 'Blocked' flag not needed as failed devices
8298 * will be recorded if array switched to read/write.
8299 * Leaving it set will prevent the device
8300 * from being removed.
8302 rdev_for_each(rdev
, mddev
)
8303 clear_bit(Blocked
, &rdev
->flags
);
8304 /* On a read-only array we can:
8305 * - remove failed devices
8306 * - add already-in_sync devices if the array itself
8308 * As we only add devices that are already in-sync,
8309 * we can activate the spares immediately.
8311 remove_and_add_spares(mddev
, NULL
);
8312 /* There is no thread, but we need to call
8313 * ->spare_active and clear saved_raid_disk
8315 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8316 md_reap_sync_thread(mddev
);
8317 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8318 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8319 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
8323 if (!mddev
->external
) {
8325 spin_lock(&mddev
->lock
);
8326 if (mddev
->safemode
&&
8327 !atomic_read(&mddev
->writes_pending
) &&
8329 mddev
->recovery_cp
== MaxSector
) {
8332 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8334 if (mddev
->safemode
== 1)
8335 mddev
->safemode
= 0;
8336 spin_unlock(&mddev
->lock
);
8338 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8341 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
8342 md_update_sb(mddev
, 0);
8344 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8345 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8346 /* resync/recovery still happening */
8347 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8350 if (mddev
->sync_thread
) {
8351 md_reap_sync_thread(mddev
);
8354 /* Set RUNNING before clearing NEEDED to avoid
8355 * any transients in the value of "sync_action".
8357 mddev
->curr_resync_completed
= 0;
8358 spin_lock(&mddev
->lock
);
8359 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8360 spin_unlock(&mddev
->lock
);
8361 /* Clear some bits that don't mean anything, but
8364 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8365 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8367 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8368 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8370 /* no recovery is running.
8371 * remove any failed drives, then
8372 * add spares if possible.
8373 * Spares are also removed and re-added, to allow
8374 * the personality to fail the re-add.
8377 if (mddev
->reshape_position
!= MaxSector
) {
8378 if (mddev
->pers
->check_reshape
== NULL
||
8379 mddev
->pers
->check_reshape(mddev
) != 0)
8380 /* Cannot proceed */
8382 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8383 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8384 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8385 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8386 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8387 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8388 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8389 } else if (mddev
->recovery_cp
< MaxSector
) {
8390 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8391 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8392 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8393 /* nothing to be done ... */
8396 if (mddev
->pers
->sync_request
) {
8398 /* We are adding a device or devices to an array
8399 * which has the bitmap stored on all devices.
8400 * So make sure all bitmap pages get written
8402 bitmap_write_all(mddev
->bitmap
);
8404 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8405 queue_work(md_misc_wq
, &mddev
->del_work
);
8409 if (!mddev
->sync_thread
) {
8410 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8411 wake_up(&resync_wait
);
8412 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8414 if (mddev
->sysfs_action
)
8415 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8418 wake_up(&mddev
->sb_wait
);
8419 mddev_unlock(mddev
);
8422 EXPORT_SYMBOL(md_check_recovery
);
8424 void md_reap_sync_thread(struct mddev
*mddev
)
8426 struct md_rdev
*rdev
;
8428 /* resync has finished, collect result */
8429 md_unregister_thread(&mddev
->sync_thread
);
8430 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8431 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8433 /* activate any spares */
8434 if (mddev
->pers
->spare_active(mddev
)) {
8435 sysfs_notify(&mddev
->kobj
, NULL
,
8437 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8440 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8441 mddev
->pers
->finish_reshape
)
8442 mddev
->pers
->finish_reshape(mddev
);
8444 /* If array is no-longer degraded, then any saved_raid_disk
8445 * information must be scrapped.
8447 if (!mddev
->degraded
)
8448 rdev_for_each(rdev
, mddev
)
8449 rdev
->saved_raid_disk
= -1;
8451 md_update_sb(mddev
, 1);
8452 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8453 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8454 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8455 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8456 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8457 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8458 wake_up(&resync_wait
);
8459 /* flag recovery needed just to double check */
8460 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8461 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8462 md_new_event(mddev
);
8463 if (mddev
->event_work
.func
)
8464 queue_work(md_misc_wq
, &mddev
->event_work
);
8466 EXPORT_SYMBOL(md_reap_sync_thread
);
8468 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8470 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8471 wait_event_timeout(rdev
->blocked_wait
,
8472 !test_bit(Blocked
, &rdev
->flags
) &&
8473 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8474 msecs_to_jiffies(5000));
8475 rdev_dec_pending(rdev
, mddev
);
8477 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8479 void md_finish_reshape(struct mddev
*mddev
)
8481 /* called be personality module when reshape completes. */
8482 struct md_rdev
*rdev
;
8484 rdev_for_each(rdev
, mddev
) {
8485 if (rdev
->data_offset
> rdev
->new_data_offset
)
8486 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8488 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8489 rdev
->data_offset
= rdev
->new_data_offset
;
8492 EXPORT_SYMBOL(md_finish_reshape
);
8494 /* Bad block management.
8495 * We can record which blocks on each device are 'bad' and so just
8496 * fail those blocks, or that stripe, rather than the whole device.
8497 * Entries in the bad-block table are 64bits wide. This comprises:
8498 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8499 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8500 * A 'shift' can be set so that larger blocks are tracked and
8501 * consequently larger devices can be covered.
8502 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8504 * Locking of the bad-block table uses a seqlock so md_is_badblock
8505 * might need to retry if it is very unlucky.
8506 * We will sometimes want to check for bad blocks in a bi_end_io function,
8507 * so we use the write_seqlock_irq variant.
8509 * When looking for a bad block we specify a range and want to
8510 * know if any block in the range is bad. So we binary-search
8511 * to the last range that starts at-or-before the given endpoint,
8512 * (or "before the sector after the target range")
8513 * then see if it ends after the given start.
8515 * 0 if there are no known bad blocks in the range
8516 * 1 if there are known bad block which are all acknowledged
8517 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8518 * plus the start/length of the first bad section we overlap.
8520 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8521 sector_t
*first_bad
, int *bad_sectors
)
8527 sector_t target
= s
+ sectors
;
8530 if (bb
->shift
> 0) {
8531 /* round the start down, and the end up */
8533 target
+= (1<<bb
->shift
) - 1;
8534 target
>>= bb
->shift
;
8535 sectors
= target
- s
;
8537 /* 'target' is now the first block after the bad range */
8540 seq
= read_seqbegin(&bb
->lock
);
8545 /* Binary search between lo and hi for 'target'
8546 * i.e. for the last range that starts before 'target'
8548 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8549 * are known not to be the last range before target.
8550 * VARIANT: hi-lo is the number of possible
8551 * ranges, and decreases until it reaches 1
8553 while (hi
- lo
> 1) {
8554 int mid
= (lo
+ hi
) / 2;
8555 sector_t a
= BB_OFFSET(p
[mid
]);
8557 /* This could still be the one, earlier ranges
8561 /* This and later ranges are definitely out. */
8564 /* 'lo' might be the last that started before target, but 'hi' isn't */
8566 /* need to check all range that end after 's' to see if
8567 * any are unacknowledged.
8570 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8571 if (BB_OFFSET(p
[lo
]) < target
) {
8572 /* starts before the end, and finishes after
8573 * the start, so they must overlap
8575 if (rv
!= -1 && BB_ACK(p
[lo
]))
8579 *first_bad
= BB_OFFSET(p
[lo
]);
8580 *bad_sectors
= BB_LEN(p
[lo
]);
8586 if (read_seqretry(&bb
->lock
, seq
))
8591 EXPORT_SYMBOL_GPL(md_is_badblock
);
8594 * Add a range of bad blocks to the table.
8595 * This might extend the table, or might contract it
8596 * if two adjacent ranges can be merged.
8597 * We binary-search to find the 'insertion' point, then
8598 * decide how best to handle it.
8600 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8606 unsigned long flags
;
8609 /* badblocks are disabled */
8613 /* round the start down, and the end up */
8614 sector_t next
= s
+ sectors
;
8616 next
+= (1<<bb
->shift
) - 1;
8621 write_seqlock_irqsave(&bb
->lock
, flags
);
8626 /* Find the last range that starts at-or-before 's' */
8627 while (hi
- lo
> 1) {
8628 int mid
= (lo
+ hi
) / 2;
8629 sector_t a
= BB_OFFSET(p
[mid
]);
8635 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8639 /* we found a range that might merge with the start
8642 sector_t a
= BB_OFFSET(p
[lo
]);
8643 sector_t e
= a
+ BB_LEN(p
[lo
]);
8644 int ack
= BB_ACK(p
[lo
]);
8646 /* Yes, we can merge with a previous range */
8647 if (s
== a
&& s
+ sectors
>= e
)
8648 /* new range covers old */
8651 ack
= ack
&& acknowledged
;
8653 if (e
< s
+ sectors
)
8655 if (e
- a
<= BB_MAX_LEN
) {
8656 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8659 /* does not all fit in one range,
8660 * make p[lo] maximal
8662 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8663 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8669 if (sectors
&& hi
< bb
->count
) {
8670 /* 'hi' points to the first range that starts after 's'.
8671 * Maybe we can merge with the start of that range */
8672 sector_t a
= BB_OFFSET(p
[hi
]);
8673 sector_t e
= a
+ BB_LEN(p
[hi
]);
8674 int ack
= BB_ACK(p
[hi
]);
8675 if (a
<= s
+ sectors
) {
8676 /* merging is possible */
8677 if (e
<= s
+ sectors
) {
8682 ack
= ack
&& acknowledged
;
8685 if (e
- a
<= BB_MAX_LEN
) {
8686 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8689 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8697 if (sectors
== 0 && hi
< bb
->count
) {
8698 /* we might be able to combine lo and hi */
8699 /* Note: 's' is at the end of 'lo' */
8700 sector_t a
= BB_OFFSET(p
[hi
]);
8701 int lolen
= BB_LEN(p
[lo
]);
8702 int hilen
= BB_LEN(p
[hi
]);
8703 int newlen
= lolen
+ hilen
- (s
- a
);
8704 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8705 /* yes, we can combine them */
8706 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8707 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8708 memmove(p
+ hi
, p
+ hi
+ 1,
8709 (bb
->count
- hi
- 1) * 8);
8714 /* didn't merge (it all).
8715 * Need to add a range just before 'hi' */
8716 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8717 /* No room for more */
8721 int this_sectors
= sectors
;
8722 memmove(p
+ hi
+ 1, p
+ hi
,
8723 (bb
->count
- hi
) * 8);
8726 if (this_sectors
> BB_MAX_LEN
)
8727 this_sectors
= BB_MAX_LEN
;
8728 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8729 sectors
-= this_sectors
;
8736 bb
->unacked_exist
= 1;
8737 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8742 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8747 s
+= rdev
->new_data_offset
;
8749 s
+= rdev
->data_offset
;
8750 rv
= md_set_badblocks(&rdev
->badblocks
,
8753 /* Make sure they get written out promptly */
8754 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8755 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8756 set_bit(MD_CHANGE_PENDING
, &rdev
->mddev
->flags
);
8757 md_wakeup_thread(rdev
->mddev
->thread
);
8761 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8764 * Remove a range of bad blocks from the table.
8765 * This may involve extending the table if we spilt a region,
8766 * but it must not fail. So if the table becomes full, we just
8767 * drop the remove request.
8769 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8773 sector_t target
= s
+ sectors
;
8776 if (bb
->shift
> 0) {
8777 /* When clearing we round the start up and the end down.
8778 * This should not matter as the shift should align with
8779 * the block size and no rounding should ever be needed.
8780 * However it is better the think a block is bad when it
8781 * isn't than to think a block is not bad when it is.
8783 s
+= (1<<bb
->shift
) - 1;
8785 target
>>= bb
->shift
;
8786 sectors
= target
- s
;
8789 write_seqlock_irq(&bb
->lock
);
8794 /* Find the last range that starts before 'target' */
8795 while (hi
- lo
> 1) {
8796 int mid
= (lo
+ hi
) / 2;
8797 sector_t a
= BB_OFFSET(p
[mid
]);
8804 /* p[lo] is the last range that could overlap the
8805 * current range. Earlier ranges could also overlap,
8806 * but only this one can overlap the end of the range.
8808 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8809 /* Partial overlap, leave the tail of this range */
8810 int ack
= BB_ACK(p
[lo
]);
8811 sector_t a
= BB_OFFSET(p
[lo
]);
8812 sector_t end
= a
+ BB_LEN(p
[lo
]);
8815 /* we need to split this range */
8816 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8820 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8822 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8825 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8826 /* there is no longer an overlap */
8831 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8832 /* This range does overlap */
8833 if (BB_OFFSET(p
[lo
]) < s
) {
8834 /* Keep the early parts of this range. */
8835 int ack
= BB_ACK(p
[lo
]);
8836 sector_t start
= BB_OFFSET(p
[lo
]);
8837 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8838 /* now low doesn't overlap, so.. */
8843 /* 'lo' is strictly before, 'hi' is strictly after,
8844 * anything between needs to be discarded
8847 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8848 bb
->count
-= (hi
- lo
- 1);
8854 write_sequnlock_irq(&bb
->lock
);
8858 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8862 s
+= rdev
->new_data_offset
;
8864 s
+= rdev
->data_offset
;
8865 return md_clear_badblocks(&rdev
->badblocks
,
8868 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8871 * Acknowledge all bad blocks in a list.
8872 * This only succeeds if ->changed is clear. It is used by
8873 * in-kernel metadata updates
8875 void md_ack_all_badblocks(struct badblocks
*bb
)
8877 if (bb
->page
== NULL
|| bb
->changed
)
8878 /* no point even trying */
8880 write_seqlock_irq(&bb
->lock
);
8882 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8885 for (i
= 0; i
< bb
->count
; i
++) {
8886 if (!BB_ACK(p
[i
])) {
8887 sector_t start
= BB_OFFSET(p
[i
]);
8888 int len
= BB_LEN(p
[i
]);
8889 p
[i
] = BB_MAKE(start
, len
, 1);
8892 bb
->unacked_exist
= 0;
8894 write_sequnlock_irq(&bb
->lock
);
8896 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8898 /* sysfs access to bad-blocks list.
8899 * We present two files.
8900 * 'bad-blocks' lists sector numbers and lengths of ranges that
8901 * are recorded as bad. The list is truncated to fit within
8902 * the one-page limit of sysfs.
8903 * Writing "sector length" to this file adds an acknowledged
8905 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8906 * been acknowledged. Writing to this file adds bad blocks
8907 * without acknowledging them. This is largely for testing.
8911 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8922 seq
= read_seqbegin(&bb
->lock
);
8927 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8928 sector_t s
= BB_OFFSET(p
[i
]);
8929 unsigned int length
= BB_LEN(p
[i
]);
8930 int ack
= BB_ACK(p
[i
]);
8936 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8937 (unsigned long long)s
<< bb
->shift
,
8938 length
<< bb
->shift
);
8940 if (unack
&& len
== 0)
8941 bb
->unacked_exist
= 0;
8943 if (read_seqretry(&bb
->lock
, seq
))
8952 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8954 unsigned long long sector
;
8958 /* Allow clearing via sysfs *only* for testing/debugging.
8959 * Normally only a successful write may clear a badblock
8962 if (page
[0] == '-') {
8966 #endif /* DO_DEBUG */
8968 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8970 if (newline
!= '\n')
8982 md_clear_badblocks(bb
, sector
, length
);
8985 #endif /* DO_DEBUG */
8986 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8992 static int md_notify_reboot(struct notifier_block
*this,
8993 unsigned long code
, void *x
)
8995 struct list_head
*tmp
;
8996 struct mddev
*mddev
;
8999 for_each_mddev(mddev
, tmp
) {
9000 if (mddev_trylock(mddev
)) {
9002 __md_stop_writes(mddev
);
9003 if (mddev
->persistent
)
9004 mddev
->safemode
= 2;
9005 mddev_unlock(mddev
);
9010 * certain more exotic SCSI devices are known to be
9011 * volatile wrt too early system reboots. While the
9012 * right place to handle this issue is the given
9013 * driver, we do want to have a safe RAID driver ...
9021 static struct notifier_block md_notifier
= {
9022 .notifier_call
= md_notify_reboot
,
9024 .priority
= INT_MAX
, /* before any real devices */
9027 static void md_geninit(void)
9029 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
9031 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
9034 static int __init
md_init(void)
9038 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
9042 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
9046 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
9049 if ((ret
= register_blkdev(0, "mdp")) < 0)
9053 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
9054 md_probe
, NULL
, NULL
);
9055 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
9056 md_probe
, NULL
, NULL
);
9058 register_reboot_notifier(&md_notifier
);
9059 raid_table_header
= register_sysctl_table(raid_root_table
);
9065 unregister_blkdev(MD_MAJOR
, "md");
9067 destroy_workqueue(md_misc_wq
);
9069 destroy_workqueue(md_wq
);
9074 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
9076 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
9077 struct md_rdev
*rdev2
;
9079 char b
[BDEVNAME_SIZE
];
9081 /* Check for change of roles in the active devices */
9082 rdev_for_each(rdev2
, mddev
) {
9083 if (test_bit(Faulty
, &rdev2
->flags
))
9086 /* Check if the roles changed */
9087 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
9089 if (test_bit(Candidate
, &rdev2
->flags
)) {
9090 if (role
== 0xfffe) {
9091 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
9092 md_kick_rdev_from_array(rdev2
);
9096 clear_bit(Candidate
, &rdev2
->flags
);
9099 if (role
!= rdev2
->raid_disk
) {
9101 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
9102 rdev2
->saved_raid_disk
= role
;
9103 ret
= remove_and_add_spares(mddev
, rdev2
);
9104 pr_info("Activated spare: %s\n",
9105 bdevname(rdev2
->bdev
,b
));
9109 * We just want to do the minimum to mark the disk
9110 * as faulty. The recovery is performed by the
9111 * one who initiated the error.
9113 if ((role
== 0xfffe) || (role
== 0xfffd)) {
9114 md_error(mddev
, rdev2
);
9115 clear_bit(Blocked
, &rdev2
->flags
);
9120 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
9121 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
9123 /* Finally set the event to be up to date */
9124 mddev
->events
= le64_to_cpu(sb
->events
);
9127 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
9130 struct page
*swapout
= rdev
->sb_page
;
9131 struct mdp_superblock_1
*sb
;
9133 /* Store the sb page of the rdev in the swapout temporary
9134 * variable in case we err in the future
9136 rdev
->sb_page
= NULL
;
9137 alloc_disk_sb(rdev
);
9138 ClearPageUptodate(rdev
->sb_page
);
9139 rdev
->sb_loaded
= 0;
9140 err
= super_types
[mddev
->major_version
].load_super(rdev
, NULL
, mddev
->minor_version
);
9143 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
9144 __func__
, __LINE__
, rdev
->desc_nr
, err
);
9145 put_page(rdev
->sb_page
);
9146 rdev
->sb_page
= swapout
;
9147 rdev
->sb_loaded
= 1;
9151 sb
= page_address(rdev
->sb_page
);
9152 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
9156 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
9157 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
9159 /* The other node finished recovery, call spare_active to set
9160 * device In_sync and mddev->degraded
9162 if (rdev
->recovery_offset
== MaxSector
&&
9163 !test_bit(In_sync
, &rdev
->flags
) &&
9164 mddev
->pers
->spare_active(mddev
))
9165 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
9171 void md_reload_sb(struct mddev
*mddev
, int nr
)
9173 struct md_rdev
*rdev
;
9177 rdev_for_each_rcu(rdev
, mddev
) {
9178 if (rdev
->desc_nr
== nr
)
9182 if (!rdev
|| rdev
->desc_nr
!= nr
) {
9183 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
9187 err
= read_rdev(mddev
, rdev
);
9191 check_sb_changes(mddev
, rdev
);
9193 /* Read all rdev's to update recovery_offset */
9194 rdev_for_each_rcu(rdev
, mddev
)
9195 read_rdev(mddev
, rdev
);
9197 EXPORT_SYMBOL(md_reload_sb
);
9202 * Searches all registered partitions for autorun RAID arrays
9206 static LIST_HEAD(all_detected_devices
);
9207 struct detected_devices_node
{
9208 struct list_head list
;
9212 void md_autodetect_dev(dev_t dev
)
9214 struct detected_devices_node
*node_detected_dev
;
9216 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
9217 if (node_detected_dev
) {
9218 node_detected_dev
->dev
= dev
;
9219 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
9221 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
9222 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
9226 static void autostart_arrays(int part
)
9228 struct md_rdev
*rdev
;
9229 struct detected_devices_node
*node_detected_dev
;
9231 int i_scanned
, i_passed
;
9236 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
9238 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
9240 node_detected_dev
= list_entry(all_detected_devices
.next
,
9241 struct detected_devices_node
, list
);
9242 list_del(&node_detected_dev
->list
);
9243 dev
= node_detected_dev
->dev
;
9244 kfree(node_detected_dev
);
9245 rdev
= md_import_device(dev
,0, 90);
9249 if (test_bit(Faulty
, &rdev
->flags
))
9252 set_bit(AutoDetected
, &rdev
->flags
);
9253 list_add(&rdev
->same_set
, &pending_raid_disks
);
9257 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
9258 i_scanned
, i_passed
);
9260 autorun_devices(part
);
9263 #endif /* !MODULE */
9265 static __exit
void md_exit(void)
9267 struct mddev
*mddev
;
9268 struct list_head
*tmp
;
9271 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
9272 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
9274 unregister_blkdev(MD_MAJOR
,"md");
9275 unregister_blkdev(mdp_major
, "mdp");
9276 unregister_reboot_notifier(&md_notifier
);
9277 unregister_sysctl_table(raid_table_header
);
9279 /* We cannot unload the modules while some process is
9280 * waiting for us in select() or poll() - wake them up
9283 while (waitqueue_active(&md_event_waiters
)) {
9284 /* not safe to leave yet */
9285 wake_up(&md_event_waiters
);
9289 remove_proc_entry("mdstat", NULL
);
9291 for_each_mddev(mddev
, tmp
) {
9292 export_array(mddev
);
9293 mddev
->hold_active
= 0;
9295 destroy_workqueue(md_misc_wq
);
9296 destroy_workqueue(md_wq
);
9299 subsys_initcall(md_init
);
9300 module_exit(md_exit
)
9302 static int get_ro(char *buffer
, struct kernel_param
*kp
)
9304 return sprintf(buffer
, "%d", start_readonly
);
9306 static int set_ro(const char *val
, struct kernel_param
*kp
)
9308 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
9311 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
9312 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
9313 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
9315 MODULE_LICENSE("GPL");
9316 MODULE_DESCRIPTION("MD RAID framework");
9318 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);