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>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 #define dprintk(x...) ((void)(DEBUG && printk(x)))
60 static DEFINE_MUTEX(md_mutex
);
63 static void autostart_arrays(int part
);
66 static LIST_HEAD(pers_list
);
67 static DEFINE_SPINLOCK(pers_lock
);
69 static void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min
= 1000;
95 static int sysctl_speed_limit_max
= 200000;
96 static inline int speed_min(mddev_t
*mddev
)
98 return mddev
->sync_speed_min
?
99 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
102 static inline int speed_max(mddev_t
*mddev
)
104 return mddev
->sync_speed_max
?
105 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
108 static struct ctl_table_header
*raid_table_header
;
110 static ctl_table raid_table
[] = {
112 .procname
= "speed_limit_min",
113 .data
= &sysctl_speed_limit_min
,
114 .maxlen
= sizeof(int),
115 .mode
= S_IRUGO
|S_IWUSR
,
116 .proc_handler
= proc_dointvec
,
119 .procname
= "speed_limit_max",
120 .data
= &sysctl_speed_limit_max
,
121 .maxlen
= sizeof(int),
122 .mode
= S_IRUGO
|S_IWUSR
,
123 .proc_handler
= proc_dointvec
,
128 static ctl_table raid_dir_table
[] = {
132 .mode
= S_IRUGO
|S_IXUGO
,
138 static ctl_table raid_root_table
[] = {
143 .child
= raid_dir_table
,
148 static const struct block_device_operations md_fops
;
150 static int start_readonly
;
153 * We have a system wide 'event count' that is incremented
154 * on any 'interesting' event, and readers of /proc/mdstat
155 * can use 'poll' or 'select' to find out when the event
159 * start array, stop array, error, add device, remove device,
160 * start build, activate spare
162 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
163 static atomic_t md_event_count
;
164 void md_new_event(mddev_t
*mddev
)
166 atomic_inc(&md_event_count
);
167 wake_up(&md_event_waiters
);
169 EXPORT_SYMBOL_GPL(md_new_event
);
171 /* Alternate version that can be called from interrupts
172 * when calling sysfs_notify isn't needed.
174 static void md_new_event_inintr(mddev_t
*mddev
)
176 atomic_inc(&md_event_count
);
177 wake_up(&md_event_waiters
);
181 * Enables to iterate over all existing md arrays
182 * all_mddevs_lock protects this list.
184 static LIST_HEAD(all_mddevs
);
185 static DEFINE_SPINLOCK(all_mddevs_lock
);
189 * iterates through all used mddevs in the system.
190 * We take care to grab the all_mddevs_lock whenever navigating
191 * the list, and to always hold a refcount when unlocked.
192 * Any code which breaks out of this loop while own
193 * a reference to the current mddev and must mddev_put it.
195 #define for_each_mddev(mddev,tmp) \
197 for (({ spin_lock(&all_mddevs_lock); \
198 tmp = all_mddevs.next; \
200 ({ if (tmp != &all_mddevs) \
201 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
202 spin_unlock(&all_mddevs_lock); \
203 if (mddev) mddev_put(mddev); \
204 mddev = list_entry(tmp, mddev_t, all_mddevs); \
205 tmp != &all_mddevs;}); \
206 ({ spin_lock(&all_mddevs_lock); \
211 /* Rather than calling directly into the personality make_request function,
212 * IO requests come here first so that we can check if the device is
213 * being suspended pending a reconfiguration.
214 * We hold a refcount over the call to ->make_request. By the time that
215 * call has finished, the bio has been linked into some internal structure
216 * and so is visible to ->quiesce(), so we don't need the refcount any more.
218 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
220 const int rw
= bio_data_dir(bio
);
221 mddev_t
*mddev
= q
->queuedata
;
225 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
230 if (mddev
->suspended
) {
233 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
234 TASK_UNINTERRUPTIBLE
);
235 if (!mddev
->suspended
)
241 finish_wait(&mddev
->sb_wait
, &__wait
);
243 atomic_inc(&mddev
->active_io
);
246 rv
= mddev
->pers
->make_request(mddev
, bio
);
248 cpu
= part_stat_lock();
249 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
250 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
],
254 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
255 wake_up(&mddev
->sb_wait
);
260 /* mddev_suspend makes sure no new requests are submitted
261 * to the device, and that any requests that have been submitted
262 * are completely handled.
263 * Once ->stop is called and completes, the module will be completely
266 void mddev_suspend(mddev_t
*mddev
)
268 BUG_ON(mddev
->suspended
);
269 mddev
->suspended
= 1;
271 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
272 mddev
->pers
->quiesce(mddev
, 1);
274 EXPORT_SYMBOL_GPL(mddev_suspend
);
276 void mddev_resume(mddev_t
*mddev
)
278 mddev
->suspended
= 0;
279 wake_up(&mddev
->sb_wait
);
280 mddev
->pers
->quiesce(mddev
, 0);
282 EXPORT_SYMBOL_GPL(mddev_resume
);
284 int mddev_congested(mddev_t
*mddev
, int bits
)
286 return mddev
->suspended
;
288 EXPORT_SYMBOL(mddev_congested
);
291 * Generic flush handling for md
294 static void md_end_flush(struct bio
*bio
, int err
)
296 mdk_rdev_t
*rdev
= bio
->bi_private
;
297 mddev_t
*mddev
= rdev
->mddev
;
299 rdev_dec_pending(rdev
, mddev
);
301 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
302 /* The pre-request flush has finished */
303 schedule_work(&mddev
->flush_work
);
308 static void submit_flushes(mddev_t
*mddev
)
313 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
314 if (rdev
->raid_disk
>= 0 &&
315 !test_bit(Faulty
, &rdev
->flags
)) {
316 /* Take two references, one is dropped
317 * when request finishes, one after
318 * we reclaim rcu_read_lock
321 atomic_inc(&rdev
->nr_pending
);
322 atomic_inc(&rdev
->nr_pending
);
324 bi
= bio_alloc(GFP_KERNEL
, 0);
325 bi
->bi_end_io
= md_end_flush
;
326 bi
->bi_private
= rdev
;
327 bi
->bi_bdev
= rdev
->bdev
;
328 atomic_inc(&mddev
->flush_pending
);
329 submit_bio(WRITE_FLUSH
, bi
);
331 rdev_dec_pending(rdev
, mddev
);
336 static void md_submit_flush_data(struct work_struct
*ws
)
338 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
339 struct bio
*bio
= mddev
->flush_bio
;
341 atomic_set(&mddev
->flush_pending
, 1);
343 if (bio
->bi_size
== 0)
344 /* an empty barrier - all done */
347 bio
->bi_rw
&= ~REQ_FLUSH
;
348 if (mddev
->pers
->make_request(mddev
, bio
))
349 generic_make_request(bio
);
351 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
352 mddev
->flush_bio
= NULL
;
353 wake_up(&mddev
->sb_wait
);
357 void md_flush_request(mddev_t
*mddev
, struct bio
*bio
)
359 spin_lock_irq(&mddev
->write_lock
);
360 wait_event_lock_irq(mddev
->sb_wait
,
362 mddev
->write_lock
, /*nothing*/);
363 mddev
->flush_bio
= bio
;
364 spin_unlock_irq(&mddev
->write_lock
);
366 atomic_set(&mddev
->flush_pending
, 1);
367 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
369 submit_flushes(mddev
);
371 if (atomic_dec_and_test(&mddev
->flush_pending
))
372 schedule_work(&mddev
->flush_work
);
374 EXPORT_SYMBOL(md_flush_request
);
376 /* Support for plugging.
377 * This mirrors the plugging support in request_queue, but does not
378 * require having a whole queue
380 static void plugger_work(struct work_struct
*work
)
382 struct plug_handle
*plug
=
383 container_of(work
, struct plug_handle
, unplug_work
);
384 plug
->unplug_fn(plug
);
386 static void plugger_timeout(unsigned long data
)
388 struct plug_handle
*plug
= (void *)data
;
389 kblockd_schedule_work(NULL
, &plug
->unplug_work
);
391 void plugger_init(struct plug_handle
*plug
,
392 void (*unplug_fn
)(struct plug_handle
*))
394 plug
->unplug_flag
= 0;
395 plug
->unplug_fn
= unplug_fn
;
396 init_timer(&plug
->unplug_timer
);
397 plug
->unplug_timer
.function
= plugger_timeout
;
398 plug
->unplug_timer
.data
= (unsigned long)plug
;
399 INIT_WORK(&plug
->unplug_work
, plugger_work
);
401 EXPORT_SYMBOL_GPL(plugger_init
);
403 void plugger_set_plug(struct plug_handle
*plug
)
405 if (!test_and_set_bit(PLUGGED_FLAG
, &plug
->unplug_flag
))
406 mod_timer(&plug
->unplug_timer
, jiffies
+ msecs_to_jiffies(3)+1);
408 EXPORT_SYMBOL_GPL(plugger_set_plug
);
410 int plugger_remove_plug(struct plug_handle
*plug
)
412 if (test_and_clear_bit(PLUGGED_FLAG
, &plug
->unplug_flag
)) {
413 del_timer(&plug
->unplug_timer
);
418 EXPORT_SYMBOL_GPL(plugger_remove_plug
);
421 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
423 atomic_inc(&mddev
->active
);
427 static void mddev_delayed_delete(struct work_struct
*ws
);
429 static void mddev_put(mddev_t
*mddev
)
431 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
433 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
434 mddev
->ctime
== 0 && !mddev
->hold_active
) {
435 /* Array is not configured at all, and not held active,
437 list_del(&mddev
->all_mddevs
);
438 if (mddev
->gendisk
) {
439 /* we did a probe so need to clean up.
440 * Call schedule_work inside the spinlock
441 * so that flush_scheduled_work() after
442 * mddev_find will succeed in waiting for the
445 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
446 schedule_work(&mddev
->del_work
);
450 spin_unlock(&all_mddevs_lock
);
453 void mddev_init(mddev_t
*mddev
)
455 mutex_init(&mddev
->open_mutex
);
456 mutex_init(&mddev
->reconfig_mutex
);
457 mutex_init(&mddev
->bitmap_info
.mutex
);
458 INIT_LIST_HEAD(&mddev
->disks
);
459 INIT_LIST_HEAD(&mddev
->all_mddevs
);
460 init_timer(&mddev
->safemode_timer
);
461 atomic_set(&mddev
->active
, 1);
462 atomic_set(&mddev
->openers
, 0);
463 atomic_set(&mddev
->active_io
, 0);
464 spin_lock_init(&mddev
->write_lock
);
465 atomic_set(&mddev
->flush_pending
, 0);
466 init_waitqueue_head(&mddev
->sb_wait
);
467 init_waitqueue_head(&mddev
->recovery_wait
);
468 mddev
->reshape_position
= MaxSector
;
469 mddev
->resync_min
= 0;
470 mddev
->resync_max
= MaxSector
;
471 mddev
->level
= LEVEL_NONE
;
473 EXPORT_SYMBOL_GPL(mddev_init
);
475 static mddev_t
* mddev_find(dev_t unit
)
477 mddev_t
*mddev
, *new = NULL
;
480 spin_lock(&all_mddevs_lock
);
483 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
484 if (mddev
->unit
== unit
) {
486 spin_unlock(&all_mddevs_lock
);
492 list_add(&new->all_mddevs
, &all_mddevs
);
493 spin_unlock(&all_mddevs_lock
);
494 new->hold_active
= UNTIL_IOCTL
;
498 /* find an unused unit number */
499 static int next_minor
= 512;
500 int start
= next_minor
;
504 dev
= MKDEV(MD_MAJOR
, next_minor
);
506 if (next_minor
> MINORMASK
)
508 if (next_minor
== start
) {
509 /* Oh dear, all in use. */
510 spin_unlock(&all_mddevs_lock
);
516 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
517 if (mddev
->unit
== dev
) {
523 new->md_minor
= MINOR(dev
);
524 new->hold_active
= UNTIL_STOP
;
525 list_add(&new->all_mddevs
, &all_mddevs
);
526 spin_unlock(&all_mddevs_lock
);
529 spin_unlock(&all_mddevs_lock
);
531 new = kzalloc(sizeof(*new), GFP_KERNEL
);
536 if (MAJOR(unit
) == MD_MAJOR
)
537 new->md_minor
= MINOR(unit
);
539 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
546 static inline int mddev_lock(mddev_t
* mddev
)
548 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
551 static inline int mddev_is_locked(mddev_t
*mddev
)
553 return mutex_is_locked(&mddev
->reconfig_mutex
);
556 static inline int mddev_trylock(mddev_t
* mddev
)
558 return mutex_trylock(&mddev
->reconfig_mutex
);
561 static struct attribute_group md_redundancy_group
;
563 static void mddev_unlock(mddev_t
* mddev
)
565 if (mddev
->to_remove
) {
566 /* These cannot be removed under reconfig_mutex as
567 * an access to the files will try to take reconfig_mutex
568 * while holding the file unremovable, which leads to
570 * So hold set sysfs_active while the remove in happeing,
571 * and anything else which might set ->to_remove or my
572 * otherwise change the sysfs namespace will fail with
573 * -EBUSY if sysfs_active is still set.
574 * We set sysfs_active under reconfig_mutex and elsewhere
575 * test it under the same mutex to ensure its correct value
578 struct attribute_group
*to_remove
= mddev
->to_remove
;
579 mddev
->to_remove
= NULL
;
580 mddev
->sysfs_active
= 1;
581 mutex_unlock(&mddev
->reconfig_mutex
);
583 if (mddev
->kobj
.sd
) {
584 if (to_remove
!= &md_redundancy_group
)
585 sysfs_remove_group(&mddev
->kobj
, to_remove
);
586 if (mddev
->pers
== NULL
||
587 mddev
->pers
->sync_request
== NULL
) {
588 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
589 if (mddev
->sysfs_action
)
590 sysfs_put(mddev
->sysfs_action
);
591 mddev
->sysfs_action
= NULL
;
594 mddev
->sysfs_active
= 0;
596 mutex_unlock(&mddev
->reconfig_mutex
);
598 md_wakeup_thread(mddev
->thread
);
601 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
605 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
606 if (rdev
->desc_nr
== nr
)
612 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
616 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
617 if (rdev
->bdev
->bd_dev
== dev
)
623 static struct mdk_personality
*find_pers(int level
, char *clevel
)
625 struct mdk_personality
*pers
;
626 list_for_each_entry(pers
, &pers_list
, list
) {
627 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
629 if (strcmp(pers
->name
, clevel
)==0)
635 /* return the offset of the super block in 512byte sectors */
636 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
638 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
639 return MD_NEW_SIZE_SECTORS(num_sectors
);
642 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
647 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
648 if (!rdev
->sb_page
) {
649 printk(KERN_ALERT
"md: out of memory.\n");
656 static void free_disk_sb(mdk_rdev_t
* rdev
)
659 put_page(rdev
->sb_page
);
661 rdev
->sb_page
= NULL
;
668 static void super_written(struct bio
*bio
, int error
)
670 mdk_rdev_t
*rdev
= bio
->bi_private
;
671 mddev_t
*mddev
= rdev
->mddev
;
673 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
674 printk("md: super_written gets error=%d, uptodate=%d\n",
675 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
676 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
677 md_error(mddev
, rdev
);
680 if (atomic_dec_and_test(&mddev
->pending_writes
))
681 wake_up(&mddev
->sb_wait
);
685 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
686 sector_t sector
, int size
, struct page
*page
)
688 /* write first size bytes of page to sector of rdev
689 * Increment mddev->pending_writes before returning
690 * and decrement it on completion, waking up sb_wait
691 * if zero is reached.
692 * If an error occurred, call md_error
694 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
696 bio
->bi_bdev
= rdev
->bdev
;
697 bio
->bi_sector
= sector
;
698 bio_add_page(bio
, page
, size
, 0);
699 bio
->bi_private
= rdev
;
700 bio
->bi_end_io
= super_written
;
702 atomic_inc(&mddev
->pending_writes
);
703 submit_bio(REQ_WRITE
| REQ_SYNC
| REQ_UNPLUG
| REQ_FLUSH
| REQ_FUA
,
707 void md_super_wait(mddev_t
*mddev
)
709 /* wait for all superblock writes that were scheduled to complete */
712 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
713 if (atomic_read(&mddev
->pending_writes
)==0)
717 finish_wait(&mddev
->sb_wait
, &wq
);
720 static void bi_complete(struct bio
*bio
, int error
)
722 complete((struct completion
*)bio
->bi_private
);
725 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
726 struct page
*page
, int rw
)
728 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
729 struct completion event
;
732 rw
|= REQ_SYNC
| REQ_UNPLUG
;
735 bio
->bi_sector
= sector
;
736 bio_add_page(bio
, page
, size
, 0);
737 init_completion(&event
);
738 bio
->bi_private
= &event
;
739 bio
->bi_end_io
= bi_complete
;
741 wait_for_completion(&event
);
743 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
747 EXPORT_SYMBOL_GPL(sync_page_io
);
749 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
751 char b
[BDEVNAME_SIZE
];
752 if (!rdev
->sb_page
) {
760 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
766 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
767 bdevname(rdev
->bdev
,b
));
771 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
773 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
774 sb1
->set_uuid1
== sb2
->set_uuid1
&&
775 sb1
->set_uuid2
== sb2
->set_uuid2
&&
776 sb1
->set_uuid3
== sb2
->set_uuid3
;
779 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
782 mdp_super_t
*tmp1
, *tmp2
;
784 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
785 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
787 if (!tmp1
|| !tmp2
) {
789 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
797 * nr_disks is not constant
802 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
810 static u32
md_csum_fold(u32 csum
)
812 csum
= (csum
& 0xffff) + (csum
>> 16);
813 return (csum
& 0xffff) + (csum
>> 16);
816 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
819 u32
*sb32
= (u32
*)sb
;
821 unsigned int disk_csum
, csum
;
823 disk_csum
= sb
->sb_csum
;
826 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
828 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
832 /* This used to use csum_partial, which was wrong for several
833 * reasons including that different results are returned on
834 * different architectures. It isn't critical that we get exactly
835 * the same return value as before (we always csum_fold before
836 * testing, and that removes any differences). However as we
837 * know that csum_partial always returned a 16bit value on
838 * alphas, do a fold to maximise conformity to previous behaviour.
840 sb
->sb_csum
= md_csum_fold(disk_csum
);
842 sb
->sb_csum
= disk_csum
;
849 * Handle superblock details.
850 * We want to be able to handle multiple superblock formats
851 * so we have a common interface to them all, and an array of
852 * different handlers.
853 * We rely on user-space to write the initial superblock, and support
854 * reading and updating of superblocks.
855 * Interface methods are:
856 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
857 * loads and validates a superblock on dev.
858 * if refdev != NULL, compare superblocks on both devices
860 * 0 - dev has a superblock that is compatible with refdev
861 * 1 - dev has a superblock that is compatible and newer than refdev
862 * so dev should be used as the refdev in future
863 * -EINVAL superblock incompatible or invalid
864 * -othererror e.g. -EIO
866 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
867 * Verify that dev is acceptable into mddev.
868 * The first time, mddev->raid_disks will be 0, and data from
869 * dev should be merged in. Subsequent calls check that dev
870 * is new enough. Return 0 or -EINVAL
872 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
873 * Update the superblock for rdev with data in mddev
874 * This does not write to disc.
880 struct module
*owner
;
881 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
883 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
884 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
885 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
886 sector_t num_sectors
);
890 * Check that the given mddev has no bitmap.
892 * This function is called from the run method of all personalities that do not
893 * support bitmaps. It prints an error message and returns non-zero if mddev
894 * has a bitmap. Otherwise, it returns 0.
897 int md_check_no_bitmap(mddev_t
*mddev
)
899 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
901 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
902 mdname(mddev
), mddev
->pers
->name
);
905 EXPORT_SYMBOL(md_check_no_bitmap
);
908 * load_super for 0.90.0
910 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
912 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
917 * Calculate the position of the superblock (512byte sectors),
918 * it's at the end of the disk.
920 * It also happens to be a multiple of 4Kb.
922 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
924 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
929 bdevname(rdev
->bdev
, b
);
930 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
932 if (sb
->md_magic
!= MD_SB_MAGIC
) {
933 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
938 if (sb
->major_version
!= 0 ||
939 sb
->minor_version
< 90 ||
940 sb
->minor_version
> 91) {
941 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
942 sb
->major_version
, sb
->minor_version
,
947 if (sb
->raid_disks
<= 0)
950 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
951 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
956 rdev
->preferred_minor
= sb
->md_minor
;
957 rdev
->data_offset
= 0;
958 rdev
->sb_size
= MD_SB_BYTES
;
960 if (sb
->level
== LEVEL_MULTIPATH
)
963 rdev
->desc_nr
= sb
->this_disk
.number
;
969 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
970 if (!uuid_equal(refsb
, sb
)) {
971 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
972 b
, bdevname(refdev
->bdev
,b2
));
975 if (!sb_equal(refsb
, sb
)) {
976 printk(KERN_WARNING
"md: %s has same UUID"
977 " but different superblock to %s\n",
978 b
, bdevname(refdev
->bdev
, b2
));
982 ev2
= md_event(refsb
);
988 rdev
->sectors
= rdev
->sb_start
;
990 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
991 /* "this cannot possibly happen" ... */
999 * validate_super for 0.90.0
1001 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1004 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1005 __u64 ev1
= md_event(sb
);
1007 rdev
->raid_disk
= -1;
1008 clear_bit(Faulty
, &rdev
->flags
);
1009 clear_bit(In_sync
, &rdev
->flags
);
1010 clear_bit(WriteMostly
, &rdev
->flags
);
1012 if (mddev
->raid_disks
== 0) {
1013 mddev
->major_version
= 0;
1014 mddev
->minor_version
= sb
->minor_version
;
1015 mddev
->patch_version
= sb
->patch_version
;
1016 mddev
->external
= 0;
1017 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1018 mddev
->ctime
= sb
->ctime
;
1019 mddev
->utime
= sb
->utime
;
1020 mddev
->level
= sb
->level
;
1021 mddev
->clevel
[0] = 0;
1022 mddev
->layout
= sb
->layout
;
1023 mddev
->raid_disks
= sb
->raid_disks
;
1024 mddev
->dev_sectors
= sb
->size
* 2;
1025 mddev
->events
= ev1
;
1026 mddev
->bitmap_info
.offset
= 0;
1027 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1029 if (mddev
->minor_version
>= 91) {
1030 mddev
->reshape_position
= sb
->reshape_position
;
1031 mddev
->delta_disks
= sb
->delta_disks
;
1032 mddev
->new_level
= sb
->new_level
;
1033 mddev
->new_layout
= sb
->new_layout
;
1034 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1036 mddev
->reshape_position
= MaxSector
;
1037 mddev
->delta_disks
= 0;
1038 mddev
->new_level
= mddev
->level
;
1039 mddev
->new_layout
= mddev
->layout
;
1040 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1043 if (sb
->state
& (1<<MD_SB_CLEAN
))
1044 mddev
->recovery_cp
= MaxSector
;
1046 if (sb
->events_hi
== sb
->cp_events_hi
&&
1047 sb
->events_lo
== sb
->cp_events_lo
) {
1048 mddev
->recovery_cp
= sb
->recovery_cp
;
1050 mddev
->recovery_cp
= 0;
1053 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1054 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1055 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1056 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1058 mddev
->max_disks
= MD_SB_DISKS
;
1060 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1061 mddev
->bitmap_info
.file
== NULL
)
1062 mddev
->bitmap_info
.offset
=
1063 mddev
->bitmap_info
.default_offset
;
1065 } else if (mddev
->pers
== NULL
) {
1066 /* Insist on good event counter while assembling, except
1067 * for spares (which don't need an event count) */
1069 if (sb
->disks
[rdev
->desc_nr
].state
& (
1070 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1071 if (ev1
< mddev
->events
)
1073 } else if (mddev
->bitmap
) {
1074 /* if adding to array with a bitmap, then we can accept an
1075 * older device ... but not too old.
1077 if (ev1
< mddev
->bitmap
->events_cleared
)
1080 if (ev1
< mddev
->events
)
1081 /* just a hot-add of a new device, leave raid_disk at -1 */
1085 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1086 desc
= sb
->disks
+ rdev
->desc_nr
;
1088 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1089 set_bit(Faulty
, &rdev
->flags
);
1090 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1091 desc->raid_disk < mddev->raid_disks */) {
1092 set_bit(In_sync
, &rdev
->flags
);
1093 rdev
->raid_disk
= desc
->raid_disk
;
1094 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1095 /* active but not in sync implies recovery up to
1096 * reshape position. We don't know exactly where
1097 * that is, so set to zero for now */
1098 if (mddev
->minor_version
>= 91) {
1099 rdev
->recovery_offset
= 0;
1100 rdev
->raid_disk
= desc
->raid_disk
;
1103 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1104 set_bit(WriteMostly
, &rdev
->flags
);
1105 } else /* MULTIPATH are always insync */
1106 set_bit(In_sync
, &rdev
->flags
);
1111 * sync_super for 0.90.0
1113 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1117 int next_spare
= mddev
->raid_disks
;
1120 /* make rdev->sb match mddev data..
1123 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1124 * 3/ any empty disks < next_spare become removed
1126 * disks[0] gets initialised to REMOVED because
1127 * we cannot be sure from other fields if it has
1128 * been initialised or not.
1131 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1133 rdev
->sb_size
= MD_SB_BYTES
;
1135 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1137 memset(sb
, 0, sizeof(*sb
));
1139 sb
->md_magic
= MD_SB_MAGIC
;
1140 sb
->major_version
= mddev
->major_version
;
1141 sb
->patch_version
= mddev
->patch_version
;
1142 sb
->gvalid_words
= 0; /* ignored */
1143 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1144 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1145 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1146 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1148 sb
->ctime
= mddev
->ctime
;
1149 sb
->level
= mddev
->level
;
1150 sb
->size
= mddev
->dev_sectors
/ 2;
1151 sb
->raid_disks
= mddev
->raid_disks
;
1152 sb
->md_minor
= mddev
->md_minor
;
1153 sb
->not_persistent
= 0;
1154 sb
->utime
= mddev
->utime
;
1156 sb
->events_hi
= (mddev
->events
>>32);
1157 sb
->events_lo
= (u32
)mddev
->events
;
1159 if (mddev
->reshape_position
== MaxSector
)
1160 sb
->minor_version
= 90;
1162 sb
->minor_version
= 91;
1163 sb
->reshape_position
= mddev
->reshape_position
;
1164 sb
->new_level
= mddev
->new_level
;
1165 sb
->delta_disks
= mddev
->delta_disks
;
1166 sb
->new_layout
= mddev
->new_layout
;
1167 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1169 mddev
->minor_version
= sb
->minor_version
;
1172 sb
->recovery_cp
= mddev
->recovery_cp
;
1173 sb
->cp_events_hi
= (mddev
->events
>>32);
1174 sb
->cp_events_lo
= (u32
)mddev
->events
;
1175 if (mddev
->recovery_cp
== MaxSector
)
1176 sb
->state
= (1<< MD_SB_CLEAN
);
1178 sb
->recovery_cp
= 0;
1180 sb
->layout
= mddev
->layout
;
1181 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1183 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1184 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1186 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1187 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1190 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1192 if (rdev2
->raid_disk
>= 0 &&
1193 sb
->minor_version
>= 91)
1194 /* we have nowhere to store the recovery_offset,
1195 * but if it is not below the reshape_position,
1196 * we can piggy-back on that.
1199 if (rdev2
->raid_disk
< 0 ||
1200 test_bit(Faulty
, &rdev2
->flags
))
1203 desc_nr
= rdev2
->raid_disk
;
1205 desc_nr
= next_spare
++;
1206 rdev2
->desc_nr
= desc_nr
;
1207 d
= &sb
->disks
[rdev2
->desc_nr
];
1209 d
->number
= rdev2
->desc_nr
;
1210 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1211 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1213 d
->raid_disk
= rdev2
->raid_disk
;
1215 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1216 if (test_bit(Faulty
, &rdev2
->flags
))
1217 d
->state
= (1<<MD_DISK_FAULTY
);
1218 else if (is_active
) {
1219 d
->state
= (1<<MD_DISK_ACTIVE
);
1220 if (test_bit(In_sync
, &rdev2
->flags
))
1221 d
->state
|= (1<<MD_DISK_SYNC
);
1229 if (test_bit(WriteMostly
, &rdev2
->flags
))
1230 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1232 /* now set the "removed" and "faulty" bits on any missing devices */
1233 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1234 mdp_disk_t
*d
= &sb
->disks
[i
];
1235 if (d
->state
== 0 && d
->number
== 0) {
1238 d
->state
= (1<<MD_DISK_REMOVED
);
1239 d
->state
|= (1<<MD_DISK_FAULTY
);
1243 sb
->nr_disks
= nr_disks
;
1244 sb
->active_disks
= active
;
1245 sb
->working_disks
= working
;
1246 sb
->failed_disks
= failed
;
1247 sb
->spare_disks
= spare
;
1249 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1250 sb
->sb_csum
= calc_sb_csum(sb
);
1254 * rdev_size_change for 0.90.0
1256 static unsigned long long
1257 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1259 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1260 return 0; /* component must fit device */
1261 if (rdev
->mddev
->bitmap_info
.offset
)
1262 return 0; /* can't move bitmap */
1263 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1264 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1265 num_sectors
= rdev
->sb_start
;
1266 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1268 md_super_wait(rdev
->mddev
);
1269 return num_sectors
/ 2; /* kB for sysfs */
1274 * version 1 superblock
1277 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1281 unsigned long long newcsum
;
1282 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1283 __le32
*isuper
= (__le32
*)sb
;
1286 disk_csum
= sb
->sb_csum
;
1289 for (i
=0; size
>=4; size
-= 4 )
1290 newcsum
+= le32_to_cpu(*isuper
++);
1293 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1295 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1296 sb
->sb_csum
= disk_csum
;
1297 return cpu_to_le32(csum
);
1300 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1302 struct mdp_superblock_1
*sb
;
1305 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1309 * Calculate the position of the superblock in 512byte sectors.
1310 * It is always aligned to a 4K boundary and
1311 * depeding on minor_version, it can be:
1312 * 0: At least 8K, but less than 12K, from end of device
1313 * 1: At start of device
1314 * 2: 4K from start of device.
1316 switch(minor_version
) {
1318 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1320 sb_start
&= ~(sector_t
)(4*2-1);
1331 rdev
->sb_start
= sb_start
;
1333 /* superblock is rarely larger than 1K, but it can be larger,
1334 * and it is safe to read 4k, so we do that
1336 ret
= read_disk_sb(rdev
, 4096);
1337 if (ret
) return ret
;
1340 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1342 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1343 sb
->major_version
!= cpu_to_le32(1) ||
1344 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1345 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1346 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1349 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1350 printk("md: invalid superblock checksum on %s\n",
1351 bdevname(rdev
->bdev
,b
));
1354 if (le64_to_cpu(sb
->data_size
) < 10) {
1355 printk("md: data_size too small on %s\n",
1356 bdevname(rdev
->bdev
,b
));
1360 rdev
->preferred_minor
= 0xffff;
1361 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1362 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1364 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1365 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1366 if (rdev
->sb_size
& bmask
)
1367 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1370 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1373 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1376 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1382 struct mdp_superblock_1
*refsb
=
1383 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1385 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1386 sb
->level
!= refsb
->level
||
1387 sb
->layout
!= refsb
->layout
||
1388 sb
->chunksize
!= refsb
->chunksize
) {
1389 printk(KERN_WARNING
"md: %s has strangely different"
1390 " superblock to %s\n",
1391 bdevname(rdev
->bdev
,b
),
1392 bdevname(refdev
->bdev
,b2
));
1395 ev1
= le64_to_cpu(sb
->events
);
1396 ev2
= le64_to_cpu(refsb
->events
);
1404 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1405 le64_to_cpu(sb
->data_offset
);
1407 rdev
->sectors
= rdev
->sb_start
;
1408 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1410 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1411 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1416 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1418 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1419 __u64 ev1
= le64_to_cpu(sb
->events
);
1421 rdev
->raid_disk
= -1;
1422 clear_bit(Faulty
, &rdev
->flags
);
1423 clear_bit(In_sync
, &rdev
->flags
);
1424 clear_bit(WriteMostly
, &rdev
->flags
);
1426 if (mddev
->raid_disks
== 0) {
1427 mddev
->major_version
= 1;
1428 mddev
->patch_version
= 0;
1429 mddev
->external
= 0;
1430 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1431 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1432 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1433 mddev
->level
= le32_to_cpu(sb
->level
);
1434 mddev
->clevel
[0] = 0;
1435 mddev
->layout
= le32_to_cpu(sb
->layout
);
1436 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1437 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1438 mddev
->events
= ev1
;
1439 mddev
->bitmap_info
.offset
= 0;
1440 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1442 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1443 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1445 mddev
->max_disks
= (4096-256)/2;
1447 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1448 mddev
->bitmap_info
.file
== NULL
)
1449 mddev
->bitmap_info
.offset
=
1450 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1452 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1453 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1454 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1455 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1456 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1457 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1459 mddev
->reshape_position
= MaxSector
;
1460 mddev
->delta_disks
= 0;
1461 mddev
->new_level
= mddev
->level
;
1462 mddev
->new_layout
= mddev
->layout
;
1463 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1466 } else if (mddev
->pers
== NULL
) {
1467 /* Insist of good event counter while assembling, except for
1468 * spares (which don't need an event count) */
1470 if (rdev
->desc_nr
>= 0 &&
1471 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1472 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1473 if (ev1
< mddev
->events
)
1475 } else if (mddev
->bitmap
) {
1476 /* If adding to array with a bitmap, then we can accept an
1477 * older device, but not too old.
1479 if (ev1
< mddev
->bitmap
->events_cleared
)
1482 if (ev1
< mddev
->events
)
1483 /* just a hot-add of a new device, leave raid_disk at -1 */
1486 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1488 if (rdev
->desc_nr
< 0 ||
1489 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1493 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1495 case 0xffff: /* spare */
1497 case 0xfffe: /* faulty */
1498 set_bit(Faulty
, &rdev
->flags
);
1501 if ((le32_to_cpu(sb
->feature_map
) &
1502 MD_FEATURE_RECOVERY_OFFSET
))
1503 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1505 set_bit(In_sync
, &rdev
->flags
);
1506 rdev
->raid_disk
= role
;
1509 if (sb
->devflags
& WriteMostly1
)
1510 set_bit(WriteMostly
, &rdev
->flags
);
1511 } else /* MULTIPATH are always insync */
1512 set_bit(In_sync
, &rdev
->flags
);
1517 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1519 struct mdp_superblock_1
*sb
;
1522 /* make rdev->sb match mddev and rdev data. */
1524 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1526 sb
->feature_map
= 0;
1528 sb
->recovery_offset
= cpu_to_le64(0);
1529 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1530 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1531 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1533 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1534 sb
->events
= cpu_to_le64(mddev
->events
);
1536 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1538 sb
->resync_offset
= cpu_to_le64(0);
1540 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1542 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1543 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1544 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1545 sb
->level
= cpu_to_le32(mddev
->level
);
1546 sb
->layout
= cpu_to_le32(mddev
->layout
);
1548 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1549 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1550 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1553 if (rdev
->raid_disk
>= 0 &&
1554 !test_bit(In_sync
, &rdev
->flags
)) {
1556 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1557 sb
->recovery_offset
=
1558 cpu_to_le64(rdev
->recovery_offset
);
1561 if (mddev
->reshape_position
!= MaxSector
) {
1562 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1563 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1564 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1565 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1566 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1567 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1571 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1572 if (rdev2
->desc_nr
+1 > max_dev
)
1573 max_dev
= rdev2
->desc_nr
+1;
1575 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1577 sb
->max_dev
= cpu_to_le32(max_dev
);
1578 rdev
->sb_size
= max_dev
* 2 + 256;
1579 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1580 if (rdev
->sb_size
& bmask
)
1581 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1583 max_dev
= le32_to_cpu(sb
->max_dev
);
1585 for (i
=0; i
<max_dev
;i
++)
1586 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1588 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1590 if (test_bit(Faulty
, &rdev2
->flags
))
1591 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1592 else if (test_bit(In_sync
, &rdev2
->flags
))
1593 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1594 else if (rdev2
->raid_disk
>= 0)
1595 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1597 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1600 sb
->sb_csum
= calc_sb_1_csum(sb
);
1603 static unsigned long long
1604 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1606 struct mdp_superblock_1
*sb
;
1607 sector_t max_sectors
;
1608 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1609 return 0; /* component must fit device */
1610 if (rdev
->sb_start
< rdev
->data_offset
) {
1611 /* minor versions 1 and 2; superblock before data */
1612 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1613 max_sectors
-= rdev
->data_offset
;
1614 if (!num_sectors
|| num_sectors
> max_sectors
)
1615 num_sectors
= max_sectors
;
1616 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1617 /* minor version 0 with bitmap we can't move */
1620 /* minor version 0; superblock after data */
1622 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1623 sb_start
&= ~(sector_t
)(4*2 - 1);
1624 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1625 if (!num_sectors
|| num_sectors
> max_sectors
)
1626 num_sectors
= max_sectors
;
1627 rdev
->sb_start
= sb_start
;
1629 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1630 sb
->data_size
= cpu_to_le64(num_sectors
);
1631 sb
->super_offset
= rdev
->sb_start
;
1632 sb
->sb_csum
= calc_sb_1_csum(sb
);
1633 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1635 md_super_wait(rdev
->mddev
);
1636 return num_sectors
/ 2; /* kB for sysfs */
1639 static struct super_type super_types
[] = {
1642 .owner
= THIS_MODULE
,
1643 .load_super
= super_90_load
,
1644 .validate_super
= super_90_validate
,
1645 .sync_super
= super_90_sync
,
1646 .rdev_size_change
= super_90_rdev_size_change
,
1650 .owner
= THIS_MODULE
,
1651 .load_super
= super_1_load
,
1652 .validate_super
= super_1_validate
,
1653 .sync_super
= super_1_sync
,
1654 .rdev_size_change
= super_1_rdev_size_change
,
1658 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1660 mdk_rdev_t
*rdev
, *rdev2
;
1663 rdev_for_each_rcu(rdev
, mddev1
)
1664 rdev_for_each_rcu(rdev2
, mddev2
)
1665 if (rdev
->bdev
->bd_contains
==
1666 rdev2
->bdev
->bd_contains
) {
1674 static LIST_HEAD(pending_raid_disks
);
1677 * Try to register data integrity profile for an mddev
1679 * This is called when an array is started and after a disk has been kicked
1680 * from the array. It only succeeds if all working and active component devices
1681 * are integrity capable with matching profiles.
1683 int md_integrity_register(mddev_t
*mddev
)
1685 mdk_rdev_t
*rdev
, *reference
= NULL
;
1687 if (list_empty(&mddev
->disks
))
1688 return 0; /* nothing to do */
1689 if (blk_get_integrity(mddev
->gendisk
))
1690 return 0; /* already registered */
1691 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1692 /* skip spares and non-functional disks */
1693 if (test_bit(Faulty
, &rdev
->flags
))
1695 if (rdev
->raid_disk
< 0)
1698 * If at least one rdev is not integrity capable, we can not
1699 * enable data integrity for the md device.
1701 if (!bdev_get_integrity(rdev
->bdev
))
1704 /* Use the first rdev as the reference */
1708 /* does this rdev's profile match the reference profile? */
1709 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1710 rdev
->bdev
->bd_disk
) < 0)
1714 * All component devices are integrity capable and have matching
1715 * profiles, register the common profile for the md device.
1717 if (blk_integrity_register(mddev
->gendisk
,
1718 bdev_get_integrity(reference
->bdev
)) != 0) {
1719 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1723 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1727 EXPORT_SYMBOL(md_integrity_register
);
1729 /* Disable data integrity if non-capable/non-matching disk is being added */
1730 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1732 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1733 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1735 if (!bi_mddev
) /* nothing to do */
1737 if (rdev
->raid_disk
< 0) /* skip spares */
1739 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1740 rdev
->bdev
->bd_disk
) >= 0)
1742 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1743 blk_integrity_unregister(mddev
->gendisk
);
1745 EXPORT_SYMBOL(md_integrity_add_rdev
);
1747 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1749 char b
[BDEVNAME_SIZE
];
1759 /* prevent duplicates */
1760 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1763 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1764 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1765 rdev
->sectors
< mddev
->dev_sectors
)) {
1767 /* Cannot change size, so fail
1768 * If mddev->level <= 0, then we don't care
1769 * about aligning sizes (e.g. linear)
1771 if (mddev
->level
> 0)
1774 mddev
->dev_sectors
= rdev
->sectors
;
1777 /* Verify rdev->desc_nr is unique.
1778 * If it is -1, assign a free number, else
1779 * check number is not in use
1781 if (rdev
->desc_nr
< 0) {
1783 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1784 while (find_rdev_nr(mddev
, choice
))
1786 rdev
->desc_nr
= choice
;
1788 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1791 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1792 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1793 mdname(mddev
), mddev
->max_disks
);
1796 bdevname(rdev
->bdev
,b
);
1797 while ( (s
=strchr(b
, '/')) != NULL
)
1800 rdev
->mddev
= mddev
;
1801 printk(KERN_INFO
"md: bind<%s>\n", b
);
1803 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1806 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1807 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1808 /* failure here is OK */;
1809 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1811 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1812 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1814 /* May as well allow recovery to be retried once */
1815 mddev
->recovery_disabled
= 0;
1820 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1825 static void md_delayed_delete(struct work_struct
*ws
)
1827 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1828 kobject_del(&rdev
->kobj
);
1829 kobject_put(&rdev
->kobj
);
1832 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1834 char b
[BDEVNAME_SIZE
];
1839 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1840 list_del_rcu(&rdev
->same_set
);
1841 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1843 sysfs_remove_link(&rdev
->kobj
, "block");
1844 sysfs_put(rdev
->sysfs_state
);
1845 rdev
->sysfs_state
= NULL
;
1846 /* We need to delay this, otherwise we can deadlock when
1847 * writing to 'remove' to "dev/state". We also need
1848 * to delay it due to rcu usage.
1851 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1852 kobject_get(&rdev
->kobj
);
1853 schedule_work(&rdev
->del_work
);
1857 * prevent the device from being mounted, repartitioned or
1858 * otherwise reused by a RAID array (or any other kernel
1859 * subsystem), by bd_claiming the device.
1861 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1864 struct block_device
*bdev
;
1865 char b
[BDEVNAME_SIZE
];
1867 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1869 printk(KERN_ERR
"md: could not open %s.\n",
1870 __bdevname(dev
, b
));
1871 return PTR_ERR(bdev
);
1873 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1875 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1877 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1881 set_bit(AllReserved
, &rdev
->flags
);
1886 static void unlock_rdev(mdk_rdev_t
*rdev
)
1888 struct block_device
*bdev
= rdev
->bdev
;
1893 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1896 void md_autodetect_dev(dev_t dev
);
1898 static void export_rdev(mdk_rdev_t
* rdev
)
1900 char b
[BDEVNAME_SIZE
];
1901 printk(KERN_INFO
"md: export_rdev(%s)\n",
1902 bdevname(rdev
->bdev
,b
));
1907 if (test_bit(AutoDetected
, &rdev
->flags
))
1908 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1911 kobject_put(&rdev
->kobj
);
1914 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1916 unbind_rdev_from_array(rdev
);
1920 static void export_array(mddev_t
*mddev
)
1922 mdk_rdev_t
*rdev
, *tmp
;
1924 rdev_for_each(rdev
, tmp
, mddev
) {
1929 kick_rdev_from_array(rdev
);
1931 if (!list_empty(&mddev
->disks
))
1933 mddev
->raid_disks
= 0;
1934 mddev
->major_version
= 0;
1937 static void print_desc(mdp_disk_t
*desc
)
1939 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1940 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1943 static void print_sb_90(mdp_super_t
*sb
)
1948 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1949 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1950 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1952 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1953 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1954 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1955 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1956 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1957 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1958 sb
->failed_disks
, sb
->spare_disks
,
1959 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1962 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1965 desc
= sb
->disks
+ i
;
1966 if (desc
->number
|| desc
->major
|| desc
->minor
||
1967 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1968 printk(" D %2d: ", i
);
1972 printk(KERN_INFO
"md: THIS: ");
1973 print_desc(&sb
->this_disk
);
1976 static void print_sb_1(struct mdp_superblock_1
*sb
)
1980 uuid
= sb
->set_uuid
;
1982 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
1983 "md: Name: \"%s\" CT:%llu\n",
1984 le32_to_cpu(sb
->major_version
),
1985 le32_to_cpu(sb
->feature_map
),
1988 (unsigned long long)le64_to_cpu(sb
->ctime
)
1989 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1991 uuid
= sb
->device_uuid
;
1993 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1995 "md: Dev:%08x UUID: %pU\n"
1996 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1997 "md: (MaxDev:%u) \n",
1998 le32_to_cpu(sb
->level
),
1999 (unsigned long long)le64_to_cpu(sb
->size
),
2000 le32_to_cpu(sb
->raid_disks
),
2001 le32_to_cpu(sb
->layout
),
2002 le32_to_cpu(sb
->chunksize
),
2003 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2004 (unsigned long long)le64_to_cpu(sb
->data_size
),
2005 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2006 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2007 le32_to_cpu(sb
->dev_number
),
2010 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2011 (unsigned long long)le64_to_cpu(sb
->events
),
2012 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2013 le32_to_cpu(sb
->sb_csum
),
2014 le32_to_cpu(sb
->max_dev
)
2018 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2020 char b
[BDEVNAME_SIZE
];
2021 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2022 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2023 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2025 if (rdev
->sb_loaded
) {
2026 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2027 switch (major_version
) {
2029 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2032 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2036 printk(KERN_INFO
"md: no rdev superblock!\n");
2039 static void md_print_devices(void)
2041 struct list_head
*tmp
;
2044 char b
[BDEVNAME_SIZE
];
2047 printk("md: **********************************\n");
2048 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2049 printk("md: **********************************\n");
2050 for_each_mddev(mddev
, tmp
) {
2053 bitmap_print_sb(mddev
->bitmap
);
2055 printk("%s: ", mdname(mddev
));
2056 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2057 printk("<%s>", bdevname(rdev
->bdev
,b
));
2060 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2061 print_rdev(rdev
, mddev
->major_version
);
2063 printk("md: **********************************\n");
2068 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2070 /* Update each superblock (in-memory image), but
2071 * if we are allowed to, skip spares which already
2072 * have the right event counter, or have one earlier
2073 * (which would mean they aren't being marked as dirty
2074 * with the rest of the array)
2077 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2078 if (rdev
->sb_events
== mddev
->events
||
2080 rdev
->raid_disk
< 0 &&
2081 rdev
->sb_events
+1 == mddev
->events
)) {
2082 /* Don't update this superblock */
2083 rdev
->sb_loaded
= 2;
2085 super_types
[mddev
->major_version
].
2086 sync_super(mddev
, rdev
);
2087 rdev
->sb_loaded
= 1;
2092 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2099 /* First make sure individual recovery_offsets are correct */
2100 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2101 if (rdev
->raid_disk
>= 0 &&
2102 mddev
->delta_disks
>= 0 &&
2103 !test_bit(In_sync
, &rdev
->flags
) &&
2104 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2105 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2108 if (!mddev
->persistent
) {
2109 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2110 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2111 if (!mddev
->external
)
2112 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2113 wake_up(&mddev
->sb_wait
);
2117 spin_lock_irq(&mddev
->write_lock
);
2119 mddev
->utime
= get_seconds();
2121 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2123 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2124 /* just a clean<-> dirty transition, possibly leave spares alone,
2125 * though if events isn't the right even/odd, we will have to do
2131 if (mddev
->degraded
)
2132 /* If the array is degraded, then skipping spares is both
2133 * dangerous and fairly pointless.
2134 * Dangerous because a device that was removed from the array
2135 * might have a event_count that still looks up-to-date,
2136 * so it can be re-added without a resync.
2137 * Pointless because if there are any spares to skip,
2138 * then a recovery will happen and soon that array won't
2139 * be degraded any more and the spare can go back to sleep then.
2143 sync_req
= mddev
->in_sync
;
2145 /* If this is just a dirty<->clean transition, and the array is clean
2146 * and 'events' is odd, we can roll back to the previous clean state */
2148 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2149 && mddev
->can_decrease_events
2150 && mddev
->events
!= 1) {
2152 mddev
->can_decrease_events
= 0;
2154 /* otherwise we have to go forward and ... */
2156 mddev
->can_decrease_events
= nospares
;
2159 if (!mddev
->events
) {
2161 * oops, this 64-bit counter should never wrap.
2162 * Either we are in around ~1 trillion A.C., assuming
2163 * 1 reboot per second, or we have a bug:
2168 sync_sbs(mddev
, nospares
);
2169 spin_unlock_irq(&mddev
->write_lock
);
2172 "md: updating %s RAID superblock on device (in sync %d)\n",
2173 mdname(mddev
),mddev
->in_sync
);
2175 bitmap_update_sb(mddev
->bitmap
);
2176 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2177 char b
[BDEVNAME_SIZE
];
2178 dprintk(KERN_INFO
"md: ");
2179 if (rdev
->sb_loaded
!= 1)
2180 continue; /* no noise on spare devices */
2181 if (test_bit(Faulty
, &rdev
->flags
))
2182 dprintk("(skipping faulty ");
2184 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2185 if (!test_bit(Faulty
, &rdev
->flags
)) {
2186 md_super_write(mddev
,rdev
,
2187 rdev
->sb_start
, rdev
->sb_size
,
2189 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2190 bdevname(rdev
->bdev
,b
),
2191 (unsigned long long)rdev
->sb_start
);
2192 rdev
->sb_events
= mddev
->events
;
2196 if (mddev
->level
== LEVEL_MULTIPATH
)
2197 /* only need to write one superblock... */
2200 md_super_wait(mddev
);
2201 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2203 spin_lock_irq(&mddev
->write_lock
);
2204 if (mddev
->in_sync
!= sync_req
||
2205 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2206 /* have to write it out again */
2207 spin_unlock_irq(&mddev
->write_lock
);
2210 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2211 spin_unlock_irq(&mddev
->write_lock
);
2212 wake_up(&mddev
->sb_wait
);
2213 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2214 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2218 /* words written to sysfs files may, or may not, be \n terminated.
2219 * We want to accept with case. For this we use cmd_match.
2221 static int cmd_match(const char *cmd
, const char *str
)
2223 /* See if cmd, written into a sysfs file, matches
2224 * str. They must either be the same, or cmd can
2225 * have a trailing newline
2227 while (*cmd
&& *str
&& *cmd
== *str
) {
2238 struct rdev_sysfs_entry
{
2239 struct attribute attr
;
2240 ssize_t (*show
)(mdk_rdev_t
*, char *);
2241 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2245 state_show(mdk_rdev_t
*rdev
, char *page
)
2250 if (test_bit(Faulty
, &rdev
->flags
)) {
2251 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2254 if (test_bit(In_sync
, &rdev
->flags
)) {
2255 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2258 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2259 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2262 if (test_bit(Blocked
, &rdev
->flags
)) {
2263 len
+= sprintf(page
+len
, "%sblocked", sep
);
2266 if (!test_bit(Faulty
, &rdev
->flags
) &&
2267 !test_bit(In_sync
, &rdev
->flags
)) {
2268 len
+= sprintf(page
+len
, "%sspare", sep
);
2271 return len
+sprintf(page
+len
, "\n");
2275 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2278 * faulty - simulates and error
2279 * remove - disconnects the device
2280 * writemostly - sets write_mostly
2281 * -writemostly - clears write_mostly
2282 * blocked - sets the Blocked flag
2283 * -blocked - clears the Blocked flag
2284 * insync - sets Insync providing device isn't active
2287 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2288 md_error(rdev
->mddev
, rdev
);
2290 } else if (cmd_match(buf
, "remove")) {
2291 if (rdev
->raid_disk
>= 0)
2294 mddev_t
*mddev
= rdev
->mddev
;
2295 kick_rdev_from_array(rdev
);
2297 md_update_sb(mddev
, 1);
2298 md_new_event(mddev
);
2301 } else if (cmd_match(buf
, "writemostly")) {
2302 set_bit(WriteMostly
, &rdev
->flags
);
2304 } else if (cmd_match(buf
, "-writemostly")) {
2305 clear_bit(WriteMostly
, &rdev
->flags
);
2307 } else if (cmd_match(buf
, "blocked")) {
2308 set_bit(Blocked
, &rdev
->flags
);
2310 } else if (cmd_match(buf
, "-blocked")) {
2311 clear_bit(Blocked
, &rdev
->flags
);
2312 wake_up(&rdev
->blocked_wait
);
2313 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2314 md_wakeup_thread(rdev
->mddev
->thread
);
2317 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2318 set_bit(In_sync
, &rdev
->flags
);
2322 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2323 return err
? err
: len
;
2325 static struct rdev_sysfs_entry rdev_state
=
2326 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2329 errors_show(mdk_rdev_t
*rdev
, char *page
)
2331 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2335 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2338 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2339 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2340 atomic_set(&rdev
->corrected_errors
, n
);
2345 static struct rdev_sysfs_entry rdev_errors
=
2346 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2349 slot_show(mdk_rdev_t
*rdev
, char *page
)
2351 if (rdev
->raid_disk
< 0)
2352 return sprintf(page
, "none\n");
2354 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2358 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2363 int slot
= simple_strtoul(buf
, &e
, 10);
2364 if (strncmp(buf
, "none", 4)==0)
2366 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2368 if (rdev
->mddev
->pers
&& slot
== -1) {
2369 /* Setting 'slot' on an active array requires also
2370 * updating the 'rd%d' link, and communicating
2371 * with the personality with ->hot_*_disk.
2372 * For now we only support removing
2373 * failed/spare devices. This normally happens automatically,
2374 * but not when the metadata is externally managed.
2376 if (rdev
->raid_disk
== -1)
2378 /* personality does all needed checks */
2379 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2381 err
= rdev
->mddev
->pers
->
2382 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2385 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2386 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2387 rdev
->raid_disk
= -1;
2388 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2389 md_wakeup_thread(rdev
->mddev
->thread
);
2390 } else if (rdev
->mddev
->pers
) {
2392 /* Activating a spare .. or possibly reactivating
2393 * if we ever get bitmaps working here.
2396 if (rdev
->raid_disk
!= -1)
2399 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2402 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2403 if (rdev2
->raid_disk
== slot
)
2406 rdev
->raid_disk
= slot
;
2407 if (test_bit(In_sync
, &rdev
->flags
))
2408 rdev
->saved_raid_disk
= slot
;
2410 rdev
->saved_raid_disk
= -1;
2411 err
= rdev
->mddev
->pers
->
2412 hot_add_disk(rdev
->mddev
, rdev
);
2414 rdev
->raid_disk
= -1;
2417 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2418 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2419 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2420 /* failure here is OK */;
2421 /* don't wakeup anyone, leave that to userspace. */
2423 if (slot
>= rdev
->mddev
->raid_disks
)
2425 rdev
->raid_disk
= slot
;
2426 /* assume it is working */
2427 clear_bit(Faulty
, &rdev
->flags
);
2428 clear_bit(WriteMostly
, &rdev
->flags
);
2429 set_bit(In_sync
, &rdev
->flags
);
2430 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2436 static struct rdev_sysfs_entry rdev_slot
=
2437 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2440 offset_show(mdk_rdev_t
*rdev
, char *page
)
2442 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2446 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2449 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2450 if (e
==buf
|| (*e
&& *e
!= '\n'))
2452 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2454 if (rdev
->sectors
&& rdev
->mddev
->external
)
2455 /* Must set offset before size, so overlap checks
2458 rdev
->data_offset
= offset
;
2462 static struct rdev_sysfs_entry rdev_offset
=
2463 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2466 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2468 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2471 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2473 /* check if two start/length pairs overlap */
2481 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2483 unsigned long long blocks
;
2486 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2489 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2490 return -EINVAL
; /* sector conversion overflow */
2493 if (new != blocks
* 2)
2494 return -EINVAL
; /* unsigned long long to sector_t overflow */
2501 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2503 mddev_t
*my_mddev
= rdev
->mddev
;
2504 sector_t oldsectors
= rdev
->sectors
;
2507 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2509 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2510 if (my_mddev
->persistent
) {
2511 sectors
= super_types
[my_mddev
->major_version
].
2512 rdev_size_change(rdev
, sectors
);
2515 } else if (!sectors
)
2516 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2519 if (sectors
< my_mddev
->dev_sectors
)
2520 return -EINVAL
; /* component must fit device */
2522 rdev
->sectors
= sectors
;
2523 if (sectors
> oldsectors
&& my_mddev
->external
) {
2524 /* need to check that all other rdevs with the same ->bdev
2525 * do not overlap. We need to unlock the mddev to avoid
2526 * a deadlock. We have already changed rdev->sectors, and if
2527 * we have to change it back, we will have the lock again.
2531 struct list_head
*tmp
;
2533 mddev_unlock(my_mddev
);
2534 for_each_mddev(mddev
, tmp
) {
2538 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2539 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2540 (rdev
->bdev
== rdev2
->bdev
&&
2542 overlaps(rdev
->data_offset
, rdev
->sectors
,
2548 mddev_unlock(mddev
);
2554 mddev_lock(my_mddev
);
2556 /* Someone else could have slipped in a size
2557 * change here, but doing so is just silly.
2558 * We put oldsectors back because we *know* it is
2559 * safe, and trust userspace not to race with
2562 rdev
->sectors
= oldsectors
;
2569 static struct rdev_sysfs_entry rdev_size
=
2570 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2573 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2575 unsigned long long recovery_start
= rdev
->recovery_offset
;
2577 if (test_bit(In_sync
, &rdev
->flags
) ||
2578 recovery_start
== MaxSector
)
2579 return sprintf(page
, "none\n");
2581 return sprintf(page
, "%llu\n", recovery_start
);
2584 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2586 unsigned long long recovery_start
;
2588 if (cmd_match(buf
, "none"))
2589 recovery_start
= MaxSector
;
2590 else if (strict_strtoull(buf
, 10, &recovery_start
))
2593 if (rdev
->mddev
->pers
&&
2594 rdev
->raid_disk
>= 0)
2597 rdev
->recovery_offset
= recovery_start
;
2598 if (recovery_start
== MaxSector
)
2599 set_bit(In_sync
, &rdev
->flags
);
2601 clear_bit(In_sync
, &rdev
->flags
);
2605 static struct rdev_sysfs_entry rdev_recovery_start
=
2606 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2608 static struct attribute
*rdev_default_attrs
[] = {
2614 &rdev_recovery_start
.attr
,
2618 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2620 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2621 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2622 mddev_t
*mddev
= rdev
->mddev
;
2628 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2630 if (rdev
->mddev
== NULL
)
2633 rv
= entry
->show(rdev
, page
);
2634 mddev_unlock(mddev
);
2640 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2641 const char *page
, size_t length
)
2643 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2644 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2646 mddev_t
*mddev
= rdev
->mddev
;
2650 if (!capable(CAP_SYS_ADMIN
))
2652 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2654 if (rdev
->mddev
== NULL
)
2657 rv
= entry
->store(rdev
, page
, length
);
2658 mddev_unlock(mddev
);
2663 static void rdev_free(struct kobject
*ko
)
2665 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2668 static const struct sysfs_ops rdev_sysfs_ops
= {
2669 .show
= rdev_attr_show
,
2670 .store
= rdev_attr_store
,
2672 static struct kobj_type rdev_ktype
= {
2673 .release
= rdev_free
,
2674 .sysfs_ops
= &rdev_sysfs_ops
,
2675 .default_attrs
= rdev_default_attrs
,
2678 void md_rdev_init(mdk_rdev_t
*rdev
)
2681 rdev
->saved_raid_disk
= -1;
2682 rdev
->raid_disk
= -1;
2684 rdev
->data_offset
= 0;
2685 rdev
->sb_events
= 0;
2686 rdev
->last_read_error
.tv_sec
= 0;
2687 rdev
->last_read_error
.tv_nsec
= 0;
2688 atomic_set(&rdev
->nr_pending
, 0);
2689 atomic_set(&rdev
->read_errors
, 0);
2690 atomic_set(&rdev
->corrected_errors
, 0);
2692 INIT_LIST_HEAD(&rdev
->same_set
);
2693 init_waitqueue_head(&rdev
->blocked_wait
);
2695 EXPORT_SYMBOL_GPL(md_rdev_init
);
2697 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2699 * mark the device faulty if:
2701 * - the device is nonexistent (zero size)
2702 * - the device has no valid superblock
2704 * a faulty rdev _never_ has rdev->sb set.
2706 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2708 char b
[BDEVNAME_SIZE
];
2713 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2715 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2716 return ERR_PTR(-ENOMEM
);
2720 if ((err
= alloc_disk_sb(rdev
)))
2723 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2727 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2729 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2732 "md: %s has zero or unknown size, marking faulty!\n",
2733 bdevname(rdev
->bdev
,b
));
2738 if (super_format
>= 0) {
2739 err
= super_types
[super_format
].
2740 load_super(rdev
, NULL
, super_minor
);
2741 if (err
== -EINVAL
) {
2743 "md: %s does not have a valid v%d.%d "
2744 "superblock, not importing!\n",
2745 bdevname(rdev
->bdev
,b
),
2746 super_format
, super_minor
);
2751 "md: could not read %s's sb, not importing!\n",
2752 bdevname(rdev
->bdev
,b
));
2760 if (rdev
->sb_page
) {
2766 return ERR_PTR(err
);
2770 * Check a full RAID array for plausibility
2774 static void analyze_sbs(mddev_t
* mddev
)
2777 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2778 char b
[BDEVNAME_SIZE
];
2781 rdev_for_each(rdev
, tmp
, mddev
)
2782 switch (super_types
[mddev
->major_version
].
2783 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2791 "md: fatal superblock inconsistency in %s"
2792 " -- removing from array\n",
2793 bdevname(rdev
->bdev
,b
));
2794 kick_rdev_from_array(rdev
);
2798 super_types
[mddev
->major_version
].
2799 validate_super(mddev
, freshest
);
2802 rdev_for_each(rdev
, tmp
, mddev
) {
2803 if (mddev
->max_disks
&&
2804 (rdev
->desc_nr
>= mddev
->max_disks
||
2805 i
> mddev
->max_disks
)) {
2807 "md: %s: %s: only %d devices permitted\n",
2808 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2810 kick_rdev_from_array(rdev
);
2813 if (rdev
!= freshest
)
2814 if (super_types
[mddev
->major_version
].
2815 validate_super(mddev
, rdev
)) {
2816 printk(KERN_WARNING
"md: kicking non-fresh %s"
2818 bdevname(rdev
->bdev
,b
));
2819 kick_rdev_from_array(rdev
);
2822 if (mddev
->level
== LEVEL_MULTIPATH
) {
2823 rdev
->desc_nr
= i
++;
2824 rdev
->raid_disk
= rdev
->desc_nr
;
2825 set_bit(In_sync
, &rdev
->flags
);
2826 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2827 rdev
->raid_disk
= -1;
2828 clear_bit(In_sync
, &rdev
->flags
);
2833 /* Read a fixed-point number.
2834 * Numbers in sysfs attributes should be in "standard" units where
2835 * possible, so time should be in seconds.
2836 * However we internally use a a much smaller unit such as
2837 * milliseconds or jiffies.
2838 * This function takes a decimal number with a possible fractional
2839 * component, and produces an integer which is the result of
2840 * multiplying that number by 10^'scale'.
2841 * all without any floating-point arithmetic.
2843 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2845 unsigned long result
= 0;
2847 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2850 else if (decimals
< scale
) {
2853 result
= result
* 10 + value
;
2865 while (decimals
< scale
) {
2874 static void md_safemode_timeout(unsigned long data
);
2877 safe_delay_show(mddev_t
*mddev
, char *page
)
2879 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2880 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2883 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2887 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2890 mddev
->safemode_delay
= 0;
2892 unsigned long old_delay
= mddev
->safemode_delay
;
2893 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2894 if (mddev
->safemode_delay
== 0)
2895 mddev
->safemode_delay
= 1;
2896 if (mddev
->safemode_delay
< old_delay
)
2897 md_safemode_timeout((unsigned long)mddev
);
2901 static struct md_sysfs_entry md_safe_delay
=
2902 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2905 level_show(mddev_t
*mddev
, char *page
)
2907 struct mdk_personality
*p
= mddev
->pers
;
2909 return sprintf(page
, "%s\n", p
->name
);
2910 else if (mddev
->clevel
[0])
2911 return sprintf(page
, "%s\n", mddev
->clevel
);
2912 else if (mddev
->level
!= LEVEL_NONE
)
2913 return sprintf(page
, "%d\n", mddev
->level
);
2919 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2923 struct mdk_personality
*pers
;
2928 if (mddev
->pers
== NULL
) {
2931 if (len
>= sizeof(mddev
->clevel
))
2933 strncpy(mddev
->clevel
, buf
, len
);
2934 if (mddev
->clevel
[len
-1] == '\n')
2936 mddev
->clevel
[len
] = 0;
2937 mddev
->level
= LEVEL_NONE
;
2941 /* request to change the personality. Need to ensure:
2942 * - array is not engaged in resync/recovery/reshape
2943 * - old personality can be suspended
2944 * - new personality will access other array.
2947 if (mddev
->sync_thread
||
2948 mddev
->reshape_position
!= MaxSector
||
2949 mddev
->sysfs_active
)
2952 if (!mddev
->pers
->quiesce
) {
2953 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
2954 mdname(mddev
), mddev
->pers
->name
);
2958 /* Now find the new personality */
2959 if (len
== 0 || len
>= sizeof(clevel
))
2961 strncpy(clevel
, buf
, len
);
2962 if (clevel
[len
-1] == '\n')
2965 if (strict_strtol(clevel
, 10, &level
))
2968 if (request_module("md-%s", clevel
) != 0)
2969 request_module("md-level-%s", clevel
);
2970 spin_lock(&pers_lock
);
2971 pers
= find_pers(level
, clevel
);
2972 if (!pers
|| !try_module_get(pers
->owner
)) {
2973 spin_unlock(&pers_lock
);
2974 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
2977 spin_unlock(&pers_lock
);
2979 if (pers
== mddev
->pers
) {
2980 /* Nothing to do! */
2981 module_put(pers
->owner
);
2984 if (!pers
->takeover
) {
2985 module_put(pers
->owner
);
2986 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
2987 mdname(mddev
), clevel
);
2991 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2992 rdev
->new_raid_disk
= rdev
->raid_disk
;
2994 /* ->takeover must set new_* and/or delta_disks
2995 * if it succeeds, and may set them when it fails.
2997 priv
= pers
->takeover(mddev
);
2999 mddev
->new_level
= mddev
->level
;
3000 mddev
->new_layout
= mddev
->layout
;
3001 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3002 mddev
->raid_disks
-= mddev
->delta_disks
;
3003 mddev
->delta_disks
= 0;
3004 module_put(pers
->owner
);
3005 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3006 mdname(mddev
), clevel
);
3007 return PTR_ERR(priv
);
3010 /* Looks like we have a winner */
3011 mddev_suspend(mddev
);
3012 mddev
->pers
->stop(mddev
);
3014 if (mddev
->pers
->sync_request
== NULL
&&
3015 pers
->sync_request
!= NULL
) {
3016 /* need to add the md_redundancy_group */
3017 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3019 "md: cannot register extra attributes for %s\n",
3021 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3023 if (mddev
->pers
->sync_request
!= NULL
&&
3024 pers
->sync_request
== NULL
) {
3025 /* need to remove the md_redundancy_group */
3026 if (mddev
->to_remove
== NULL
)
3027 mddev
->to_remove
= &md_redundancy_group
;
3030 if (mddev
->pers
->sync_request
== NULL
&&
3032 /* We are converting from a no-redundancy array
3033 * to a redundancy array and metadata is managed
3034 * externally so we need to be sure that writes
3035 * won't block due to a need to transition
3037 * until external management is started.
3040 mddev
->safemode_delay
= 0;
3041 mddev
->safemode
= 0;
3044 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3046 if (rdev
->raid_disk
< 0)
3048 if (rdev
->new_raid_disk
> mddev
->raid_disks
)
3049 rdev
->new_raid_disk
= -1;
3050 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3052 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3053 sysfs_remove_link(&mddev
->kobj
, nm
);
3055 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3056 if (rdev
->raid_disk
< 0)
3058 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3060 rdev
->raid_disk
= rdev
->new_raid_disk
;
3061 if (rdev
->raid_disk
< 0)
3062 clear_bit(In_sync
, &rdev
->flags
);
3065 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3066 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3067 printk("md: cannot register %s for %s after level change\n",
3072 module_put(mddev
->pers
->owner
);
3074 mddev
->private = priv
;
3075 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3076 mddev
->level
= mddev
->new_level
;
3077 mddev
->layout
= mddev
->new_layout
;
3078 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3079 mddev
->delta_disks
= 0;
3080 if (mddev
->pers
->sync_request
== NULL
) {
3081 /* this is now an array without redundancy, so
3082 * it must always be in_sync
3085 del_timer_sync(&mddev
->safemode_timer
);
3088 mddev_resume(mddev
);
3089 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3090 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3091 md_wakeup_thread(mddev
->thread
);
3092 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3093 md_new_event(mddev
);
3097 static struct md_sysfs_entry md_level
=
3098 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3102 layout_show(mddev_t
*mddev
, char *page
)
3104 /* just a number, not meaningful for all levels */
3105 if (mddev
->reshape_position
!= MaxSector
&&
3106 mddev
->layout
!= mddev
->new_layout
)
3107 return sprintf(page
, "%d (%d)\n",
3108 mddev
->new_layout
, mddev
->layout
);
3109 return sprintf(page
, "%d\n", mddev
->layout
);
3113 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3116 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3118 if (!*buf
|| (*e
&& *e
!= '\n'))
3123 if (mddev
->pers
->check_reshape
== NULL
)
3125 mddev
->new_layout
= n
;
3126 err
= mddev
->pers
->check_reshape(mddev
);
3128 mddev
->new_layout
= mddev
->layout
;
3132 mddev
->new_layout
= n
;
3133 if (mddev
->reshape_position
== MaxSector
)
3138 static struct md_sysfs_entry md_layout
=
3139 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3143 raid_disks_show(mddev_t
*mddev
, char *page
)
3145 if (mddev
->raid_disks
== 0)
3147 if (mddev
->reshape_position
!= MaxSector
&&
3148 mddev
->delta_disks
!= 0)
3149 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3150 mddev
->raid_disks
- mddev
->delta_disks
);
3151 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3154 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3157 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3161 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3163 if (!*buf
|| (*e
&& *e
!= '\n'))
3167 rv
= update_raid_disks(mddev
, n
);
3168 else if (mddev
->reshape_position
!= MaxSector
) {
3169 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3170 mddev
->delta_disks
= n
- olddisks
;
3171 mddev
->raid_disks
= n
;
3173 mddev
->raid_disks
= n
;
3174 return rv
? rv
: len
;
3176 static struct md_sysfs_entry md_raid_disks
=
3177 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3180 chunk_size_show(mddev_t
*mddev
, char *page
)
3182 if (mddev
->reshape_position
!= MaxSector
&&
3183 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3184 return sprintf(page
, "%d (%d)\n",
3185 mddev
->new_chunk_sectors
<< 9,
3186 mddev
->chunk_sectors
<< 9);
3187 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3191 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3194 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3196 if (!*buf
|| (*e
&& *e
!= '\n'))
3201 if (mddev
->pers
->check_reshape
== NULL
)
3203 mddev
->new_chunk_sectors
= n
>> 9;
3204 err
= mddev
->pers
->check_reshape(mddev
);
3206 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3210 mddev
->new_chunk_sectors
= n
>> 9;
3211 if (mddev
->reshape_position
== MaxSector
)
3212 mddev
->chunk_sectors
= n
>> 9;
3216 static struct md_sysfs_entry md_chunk_size
=
3217 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3220 resync_start_show(mddev_t
*mddev
, char *page
)
3222 if (mddev
->recovery_cp
== MaxSector
)
3223 return sprintf(page
, "none\n");
3224 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3228 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3231 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3235 if (cmd_match(buf
, "none"))
3237 else if (!*buf
|| (*e
&& *e
!= '\n'))
3240 mddev
->recovery_cp
= n
;
3243 static struct md_sysfs_entry md_resync_start
=
3244 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3247 * The array state can be:
3250 * No devices, no size, no level
3251 * Equivalent to STOP_ARRAY ioctl
3253 * May have some settings, but array is not active
3254 * all IO results in error
3255 * When written, doesn't tear down array, but just stops it
3256 * suspended (not supported yet)
3257 * All IO requests will block. The array can be reconfigured.
3258 * Writing this, if accepted, will block until array is quiescent
3260 * no resync can happen. no superblocks get written.
3261 * write requests fail
3263 * like readonly, but behaves like 'clean' on a write request.
3265 * clean - no pending writes, but otherwise active.
3266 * When written to inactive array, starts without resync
3267 * If a write request arrives then
3268 * if metadata is known, mark 'dirty' and switch to 'active'.
3269 * if not known, block and switch to write-pending
3270 * If written to an active array that has pending writes, then fails.
3272 * fully active: IO and resync can be happening.
3273 * When written to inactive array, starts with resync
3276 * clean, but writes are blocked waiting for 'active' to be written.
3279 * like active, but no writes have been seen for a while (100msec).
3282 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3283 write_pending
, active_idle
, bad_word
};
3284 static char *array_states
[] = {
3285 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3286 "write-pending", "active-idle", NULL
};
3288 static int match_word(const char *word
, char **list
)
3291 for (n
=0; list
[n
]; n
++)
3292 if (cmd_match(word
, list
[n
]))
3298 array_state_show(mddev_t
*mddev
, char *page
)
3300 enum array_state st
= inactive
;
3313 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3315 else if (mddev
->safemode
)
3321 if (list_empty(&mddev
->disks
) &&
3322 mddev
->raid_disks
== 0 &&
3323 mddev
->dev_sectors
== 0)
3328 return sprintf(page
, "%s\n", array_states
[st
]);
3331 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3332 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3333 static int do_md_run(mddev_t
* mddev
);
3334 static int restart_array(mddev_t
*mddev
);
3337 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3340 enum array_state st
= match_word(buf
, array_states
);
3345 /* stopping an active array */
3346 if (atomic_read(&mddev
->openers
) > 0)
3348 err
= do_md_stop(mddev
, 0, 0);
3351 /* stopping an active array */
3353 if (atomic_read(&mddev
->openers
) > 0)
3355 err
= do_md_stop(mddev
, 2, 0);
3357 err
= 0; /* already inactive */
3360 break; /* not supported yet */
3363 err
= md_set_readonly(mddev
, 0);
3366 set_disk_ro(mddev
->gendisk
, 1);
3367 err
= do_md_run(mddev
);
3373 err
= md_set_readonly(mddev
, 0);
3374 else if (mddev
->ro
== 1)
3375 err
= restart_array(mddev
);
3378 set_disk_ro(mddev
->gendisk
, 0);
3382 err
= do_md_run(mddev
);
3387 restart_array(mddev
);
3388 spin_lock_irq(&mddev
->write_lock
);
3389 if (atomic_read(&mddev
->writes_pending
) == 0) {
3390 if (mddev
->in_sync
== 0) {
3392 if (mddev
->safemode
== 1)
3393 mddev
->safemode
= 0;
3394 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3399 spin_unlock_irq(&mddev
->write_lock
);
3405 restart_array(mddev
);
3406 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3407 wake_up(&mddev
->sb_wait
);
3411 set_disk_ro(mddev
->gendisk
, 0);
3412 err
= do_md_run(mddev
);
3417 /* these cannot be set */
3423 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3427 static struct md_sysfs_entry md_array_state
=
3428 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3431 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3432 return sprintf(page
, "%d\n",
3433 atomic_read(&mddev
->max_corr_read_errors
));
3437 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3440 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3442 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3443 atomic_set(&mddev
->max_corr_read_errors
, n
);
3449 static struct md_sysfs_entry max_corr_read_errors
=
3450 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3451 max_corrected_read_errors_store
);
3454 null_show(mddev_t
*mddev
, char *page
)
3460 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3462 /* buf must be %d:%d\n? giving major and minor numbers */
3463 /* The new device is added to the array.
3464 * If the array has a persistent superblock, we read the
3465 * superblock to initialise info and check validity.
3466 * Otherwise, only checking done is that in bind_rdev_to_array,
3467 * which mainly checks size.
3470 int major
= simple_strtoul(buf
, &e
, 10);
3476 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3478 minor
= simple_strtoul(e
+1, &e
, 10);
3479 if (*e
&& *e
!= '\n')
3481 dev
= MKDEV(major
, minor
);
3482 if (major
!= MAJOR(dev
) ||
3483 minor
!= MINOR(dev
))
3487 if (mddev
->persistent
) {
3488 rdev
= md_import_device(dev
, mddev
->major_version
,
3489 mddev
->minor_version
);
3490 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3491 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3492 mdk_rdev_t
, same_set
);
3493 err
= super_types
[mddev
->major_version
]
3494 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3498 } else if (mddev
->external
)
3499 rdev
= md_import_device(dev
, -2, -1);
3501 rdev
= md_import_device(dev
, -1, -1);
3504 return PTR_ERR(rdev
);
3505 err
= bind_rdev_to_array(rdev
, mddev
);
3509 return err
? err
: len
;
3512 static struct md_sysfs_entry md_new_device
=
3513 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3516 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3519 unsigned long chunk
, end_chunk
;
3523 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3525 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3526 if (buf
== end
) break;
3527 if (*end
== '-') { /* range */
3529 end_chunk
= simple_strtoul(buf
, &end
, 0);
3530 if (buf
== end
) break;
3532 if (*end
&& !isspace(*end
)) break;
3533 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3534 buf
= skip_spaces(end
);
3536 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3541 static struct md_sysfs_entry md_bitmap
=
3542 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3545 size_show(mddev_t
*mddev
, char *page
)
3547 return sprintf(page
, "%llu\n",
3548 (unsigned long long)mddev
->dev_sectors
/ 2);
3551 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3554 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3556 /* If array is inactive, we can reduce the component size, but
3557 * not increase it (except from 0).
3558 * If array is active, we can try an on-line resize
3561 int err
= strict_blocks_to_sectors(buf
, §ors
);
3566 err
= update_size(mddev
, sectors
);
3567 md_update_sb(mddev
, 1);
3569 if (mddev
->dev_sectors
== 0 ||
3570 mddev
->dev_sectors
> sectors
)
3571 mddev
->dev_sectors
= sectors
;
3575 return err
? err
: len
;
3578 static struct md_sysfs_entry md_size
=
3579 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3584 * 'none' for arrays with no metadata (good luck...)
3585 * 'external' for arrays with externally managed metadata,
3586 * or N.M for internally known formats
3589 metadata_show(mddev_t
*mddev
, char *page
)
3591 if (mddev
->persistent
)
3592 return sprintf(page
, "%d.%d\n",
3593 mddev
->major_version
, mddev
->minor_version
);
3594 else if (mddev
->external
)
3595 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3597 return sprintf(page
, "none\n");
3601 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3605 /* Changing the details of 'external' metadata is
3606 * always permitted. Otherwise there must be
3607 * no devices attached to the array.
3609 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3611 else if (!list_empty(&mddev
->disks
))
3614 if (cmd_match(buf
, "none")) {
3615 mddev
->persistent
= 0;
3616 mddev
->external
= 0;
3617 mddev
->major_version
= 0;
3618 mddev
->minor_version
= 90;
3621 if (strncmp(buf
, "external:", 9) == 0) {
3622 size_t namelen
= len
-9;
3623 if (namelen
>= sizeof(mddev
->metadata_type
))
3624 namelen
= sizeof(mddev
->metadata_type
)-1;
3625 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3626 mddev
->metadata_type
[namelen
] = 0;
3627 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3628 mddev
->metadata_type
[--namelen
] = 0;
3629 mddev
->persistent
= 0;
3630 mddev
->external
= 1;
3631 mddev
->major_version
= 0;
3632 mddev
->minor_version
= 90;
3635 major
= simple_strtoul(buf
, &e
, 10);
3636 if (e
==buf
|| *e
!= '.')
3639 minor
= simple_strtoul(buf
, &e
, 10);
3640 if (e
==buf
|| (*e
&& *e
!= '\n') )
3642 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3644 mddev
->major_version
= major
;
3645 mddev
->minor_version
= minor
;
3646 mddev
->persistent
= 1;
3647 mddev
->external
= 0;
3651 static struct md_sysfs_entry md_metadata
=
3652 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3655 action_show(mddev_t
*mddev
, char *page
)
3657 char *type
= "idle";
3658 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3660 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3661 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3662 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3664 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3665 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3667 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3671 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3674 return sprintf(page
, "%s\n", type
);
3678 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3680 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3683 if (cmd_match(page
, "frozen"))
3684 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3686 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3688 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3689 if (mddev
->sync_thread
) {
3690 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3691 md_unregister_thread(mddev
->sync_thread
);
3692 mddev
->sync_thread
= NULL
;
3693 mddev
->recovery
= 0;
3695 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3696 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3698 else if (cmd_match(page
, "resync"))
3699 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3700 else if (cmd_match(page
, "recover")) {
3701 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3702 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3703 } else if (cmd_match(page
, "reshape")) {
3705 if (mddev
->pers
->start_reshape
== NULL
)
3707 err
= mddev
->pers
->start_reshape(mddev
);
3710 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3712 if (cmd_match(page
, "check"))
3713 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3714 else if (!cmd_match(page
, "repair"))
3716 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3717 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3719 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3720 md_wakeup_thread(mddev
->thread
);
3721 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3726 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3728 return sprintf(page
, "%llu\n",
3729 (unsigned long long) mddev
->resync_mismatches
);
3732 static struct md_sysfs_entry md_scan_mode
=
3733 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3736 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3739 sync_min_show(mddev_t
*mddev
, char *page
)
3741 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3742 mddev
->sync_speed_min
? "local": "system");
3746 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3750 if (strncmp(buf
, "system", 6)==0) {
3751 mddev
->sync_speed_min
= 0;
3754 min
= simple_strtoul(buf
, &e
, 10);
3755 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3757 mddev
->sync_speed_min
= min
;
3761 static struct md_sysfs_entry md_sync_min
=
3762 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3765 sync_max_show(mddev_t
*mddev
, char *page
)
3767 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3768 mddev
->sync_speed_max
? "local": "system");
3772 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3776 if (strncmp(buf
, "system", 6)==0) {
3777 mddev
->sync_speed_max
= 0;
3780 max
= simple_strtoul(buf
, &e
, 10);
3781 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3783 mddev
->sync_speed_max
= max
;
3787 static struct md_sysfs_entry md_sync_max
=
3788 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3791 degraded_show(mddev_t
*mddev
, char *page
)
3793 return sprintf(page
, "%d\n", mddev
->degraded
);
3795 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3798 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3800 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3804 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3808 if (strict_strtol(buf
, 10, &n
))
3811 if (n
!= 0 && n
!= 1)
3814 mddev
->parallel_resync
= n
;
3816 if (mddev
->sync_thread
)
3817 wake_up(&resync_wait
);
3822 /* force parallel resync, even with shared block devices */
3823 static struct md_sysfs_entry md_sync_force_parallel
=
3824 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3825 sync_force_parallel_show
, sync_force_parallel_store
);
3828 sync_speed_show(mddev_t
*mddev
, char *page
)
3830 unsigned long resync
, dt
, db
;
3831 if (mddev
->curr_resync
== 0)
3832 return sprintf(page
, "none\n");
3833 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3834 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3836 db
= resync
- mddev
->resync_mark_cnt
;
3837 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3840 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3843 sync_completed_show(mddev_t
*mddev
, char *page
)
3845 unsigned long max_sectors
, resync
;
3847 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3848 return sprintf(page
, "none\n");
3850 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3851 max_sectors
= mddev
->resync_max_sectors
;
3853 max_sectors
= mddev
->dev_sectors
;
3855 resync
= mddev
->curr_resync_completed
;
3856 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3859 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3862 min_sync_show(mddev_t
*mddev
, char *page
)
3864 return sprintf(page
, "%llu\n",
3865 (unsigned long long)mddev
->resync_min
);
3868 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3870 unsigned long long min
;
3871 if (strict_strtoull(buf
, 10, &min
))
3873 if (min
> mddev
->resync_max
)
3875 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3878 /* Must be a multiple of chunk_size */
3879 if (mddev
->chunk_sectors
) {
3880 sector_t temp
= min
;
3881 if (sector_div(temp
, mddev
->chunk_sectors
))
3884 mddev
->resync_min
= min
;
3889 static struct md_sysfs_entry md_min_sync
=
3890 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3893 max_sync_show(mddev_t
*mddev
, char *page
)
3895 if (mddev
->resync_max
== MaxSector
)
3896 return sprintf(page
, "max\n");
3898 return sprintf(page
, "%llu\n",
3899 (unsigned long long)mddev
->resync_max
);
3902 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3904 if (strncmp(buf
, "max", 3) == 0)
3905 mddev
->resync_max
= MaxSector
;
3907 unsigned long long max
;
3908 if (strict_strtoull(buf
, 10, &max
))
3910 if (max
< mddev
->resync_min
)
3912 if (max
< mddev
->resync_max
&&
3914 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3917 /* Must be a multiple of chunk_size */
3918 if (mddev
->chunk_sectors
) {
3919 sector_t temp
= max
;
3920 if (sector_div(temp
, mddev
->chunk_sectors
))
3923 mddev
->resync_max
= max
;
3925 wake_up(&mddev
->recovery_wait
);
3929 static struct md_sysfs_entry md_max_sync
=
3930 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3933 suspend_lo_show(mddev_t
*mddev
, char *page
)
3935 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3939 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3942 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3944 if (mddev
->pers
== NULL
||
3945 mddev
->pers
->quiesce
== NULL
)
3947 if (buf
== e
|| (*e
&& *e
!= '\n'))
3949 if (new >= mddev
->suspend_hi
||
3950 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3951 mddev
->suspend_lo
= new;
3952 mddev
->pers
->quiesce(mddev
, 2);
3957 static struct md_sysfs_entry md_suspend_lo
=
3958 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3962 suspend_hi_show(mddev_t
*mddev
, char *page
)
3964 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3968 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3971 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3973 if (mddev
->pers
== NULL
||
3974 mddev
->pers
->quiesce
== NULL
)
3976 if (buf
== e
|| (*e
&& *e
!= '\n'))
3978 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3979 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3980 mddev
->suspend_hi
= new;
3981 mddev
->pers
->quiesce(mddev
, 1);
3982 mddev
->pers
->quiesce(mddev
, 0);
3987 static struct md_sysfs_entry md_suspend_hi
=
3988 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3991 reshape_position_show(mddev_t
*mddev
, char *page
)
3993 if (mddev
->reshape_position
!= MaxSector
)
3994 return sprintf(page
, "%llu\n",
3995 (unsigned long long)mddev
->reshape_position
);
3996 strcpy(page
, "none\n");
4001 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4004 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4007 if (buf
== e
|| (*e
&& *e
!= '\n'))
4009 mddev
->reshape_position
= new;
4010 mddev
->delta_disks
= 0;
4011 mddev
->new_level
= mddev
->level
;
4012 mddev
->new_layout
= mddev
->layout
;
4013 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4017 static struct md_sysfs_entry md_reshape_position
=
4018 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4019 reshape_position_store
);
4022 array_size_show(mddev_t
*mddev
, char *page
)
4024 if (mddev
->external_size
)
4025 return sprintf(page
, "%llu\n",
4026 (unsigned long long)mddev
->array_sectors
/2);
4028 return sprintf(page
, "default\n");
4032 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4036 if (strncmp(buf
, "default", 7) == 0) {
4038 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4040 sectors
= mddev
->array_sectors
;
4042 mddev
->external_size
= 0;
4044 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4046 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4049 mddev
->external_size
= 1;
4052 mddev
->array_sectors
= sectors
;
4053 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4055 revalidate_disk(mddev
->gendisk
);
4060 static struct md_sysfs_entry md_array_size
=
4061 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4064 static struct attribute
*md_default_attrs
[] = {
4067 &md_raid_disks
.attr
,
4068 &md_chunk_size
.attr
,
4070 &md_resync_start
.attr
,
4072 &md_new_device
.attr
,
4073 &md_safe_delay
.attr
,
4074 &md_array_state
.attr
,
4075 &md_reshape_position
.attr
,
4076 &md_array_size
.attr
,
4077 &max_corr_read_errors
.attr
,
4081 static struct attribute
*md_redundancy_attrs
[] = {
4083 &md_mismatches
.attr
,
4086 &md_sync_speed
.attr
,
4087 &md_sync_force_parallel
.attr
,
4088 &md_sync_completed
.attr
,
4091 &md_suspend_lo
.attr
,
4092 &md_suspend_hi
.attr
,
4097 static struct attribute_group md_redundancy_group
= {
4099 .attrs
= md_redundancy_attrs
,
4104 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4106 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4107 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4112 rv
= mddev_lock(mddev
);
4114 rv
= entry
->show(mddev
, page
);
4115 mddev_unlock(mddev
);
4121 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4122 const char *page
, size_t length
)
4124 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4125 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4130 if (!capable(CAP_SYS_ADMIN
))
4132 rv
= mddev_lock(mddev
);
4133 if (mddev
->hold_active
== UNTIL_IOCTL
)
4134 mddev
->hold_active
= 0;
4136 rv
= entry
->store(mddev
, page
, length
);
4137 mddev_unlock(mddev
);
4142 static void md_free(struct kobject
*ko
)
4144 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4146 if (mddev
->sysfs_state
)
4147 sysfs_put(mddev
->sysfs_state
);
4149 if (mddev
->gendisk
) {
4150 del_gendisk(mddev
->gendisk
);
4151 put_disk(mddev
->gendisk
);
4154 blk_cleanup_queue(mddev
->queue
);
4159 static const struct sysfs_ops md_sysfs_ops
= {
4160 .show
= md_attr_show
,
4161 .store
= md_attr_store
,
4163 static struct kobj_type md_ktype
= {
4165 .sysfs_ops
= &md_sysfs_ops
,
4166 .default_attrs
= md_default_attrs
,
4171 static void mddev_delayed_delete(struct work_struct
*ws
)
4173 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4175 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4176 kobject_del(&mddev
->kobj
);
4177 kobject_put(&mddev
->kobj
);
4180 static int md_alloc(dev_t dev
, char *name
)
4182 static DEFINE_MUTEX(disks_mutex
);
4183 mddev_t
*mddev
= mddev_find(dev
);
4184 struct gendisk
*disk
;
4193 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4194 shift
= partitioned
? MdpMinorShift
: 0;
4195 unit
= MINOR(mddev
->unit
) >> shift
;
4197 /* wait for any previous instance if this device
4198 * to be completed removed (mddev_delayed_delete).
4200 flush_scheduled_work();
4202 mutex_lock(&disks_mutex
);
4208 /* Need to ensure that 'name' is not a duplicate.
4211 spin_lock(&all_mddevs_lock
);
4213 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4214 if (mddev2
->gendisk
&&
4215 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4216 spin_unlock(&all_mddevs_lock
);
4219 spin_unlock(&all_mddevs_lock
);
4223 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4226 mddev
->queue
->queuedata
= mddev
;
4228 /* Can be unlocked because the queue is new: no concurrency */
4229 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
4231 blk_queue_make_request(mddev
->queue
, md_make_request
);
4233 disk
= alloc_disk(1 << shift
);
4235 blk_cleanup_queue(mddev
->queue
);
4236 mddev
->queue
= NULL
;
4239 disk
->major
= MAJOR(mddev
->unit
);
4240 disk
->first_minor
= unit
<< shift
;
4242 strcpy(disk
->disk_name
, name
);
4243 else if (partitioned
)
4244 sprintf(disk
->disk_name
, "md_d%d", unit
);
4246 sprintf(disk
->disk_name
, "md%d", unit
);
4247 disk
->fops
= &md_fops
;
4248 disk
->private_data
= mddev
;
4249 disk
->queue
= mddev
->queue
;
4250 /* Allow extended partitions. This makes the
4251 * 'mdp' device redundant, but we can't really
4254 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4256 mddev
->gendisk
= disk
;
4257 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4258 &disk_to_dev(disk
)->kobj
, "%s", "md");
4260 /* This isn't possible, but as kobject_init_and_add is marked
4261 * __must_check, we must do something with the result
4263 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4267 if (mddev
->kobj
.sd
&&
4268 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4269 printk(KERN_DEBUG
"pointless warning\n");
4271 mutex_unlock(&disks_mutex
);
4272 if (!error
&& mddev
->kobj
.sd
) {
4273 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4274 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4280 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4282 md_alloc(dev
, NULL
);
4286 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4288 /* val must be "md_*" where * is not all digits.
4289 * We allocate an array with a large free minor number, and
4290 * set the name to val. val must not already be an active name.
4292 int len
= strlen(val
);
4293 char buf
[DISK_NAME_LEN
];
4295 while (len
&& val
[len
-1] == '\n')
4297 if (len
>= DISK_NAME_LEN
)
4299 strlcpy(buf
, val
, len
+1);
4300 if (strncmp(buf
, "md_", 3) != 0)
4302 return md_alloc(0, buf
);
4305 static void md_safemode_timeout(unsigned long data
)
4307 mddev_t
*mddev
= (mddev_t
*) data
;
4309 if (!atomic_read(&mddev
->writes_pending
)) {
4310 mddev
->safemode
= 1;
4311 if (mddev
->external
)
4312 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4314 md_wakeup_thread(mddev
->thread
);
4317 static int start_dirty_degraded
;
4319 int md_run(mddev_t
*mddev
)
4323 struct mdk_personality
*pers
;
4325 if (list_empty(&mddev
->disks
))
4326 /* cannot run an array with no devices.. */
4331 /* Cannot run until previous stop completes properly */
4332 if (mddev
->sysfs_active
)
4336 * Analyze all RAID superblock(s)
4338 if (!mddev
->raid_disks
) {
4339 if (!mddev
->persistent
)
4344 if (mddev
->level
!= LEVEL_NONE
)
4345 request_module("md-level-%d", mddev
->level
);
4346 else if (mddev
->clevel
[0])
4347 request_module("md-%s", mddev
->clevel
);
4350 * Drop all container device buffers, from now on
4351 * the only valid external interface is through the md
4354 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4355 if (test_bit(Faulty
, &rdev
->flags
))
4357 sync_blockdev(rdev
->bdev
);
4358 invalidate_bdev(rdev
->bdev
);
4360 /* perform some consistency tests on the device.
4361 * We don't want the data to overlap the metadata,
4362 * Internal Bitmap issues have been handled elsewhere.
4364 if (rdev
->data_offset
< rdev
->sb_start
) {
4365 if (mddev
->dev_sectors
&&
4366 rdev
->data_offset
+ mddev
->dev_sectors
4368 printk("md: %s: data overlaps metadata\n",
4373 if (rdev
->sb_start
+ rdev
->sb_size
/512
4374 > rdev
->data_offset
) {
4375 printk("md: %s: metadata overlaps data\n",
4380 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4383 spin_lock(&pers_lock
);
4384 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4385 if (!pers
|| !try_module_get(pers
->owner
)) {
4386 spin_unlock(&pers_lock
);
4387 if (mddev
->level
!= LEVEL_NONE
)
4388 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4391 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4396 spin_unlock(&pers_lock
);
4397 if (mddev
->level
!= pers
->level
) {
4398 mddev
->level
= pers
->level
;
4399 mddev
->new_level
= pers
->level
;
4401 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4403 if (mddev
->reshape_position
!= MaxSector
&&
4404 pers
->start_reshape
== NULL
) {
4405 /* This personality cannot handle reshaping... */
4407 module_put(pers
->owner
);
4411 if (pers
->sync_request
) {
4412 /* Warn if this is a potentially silly
4415 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4419 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4420 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4422 rdev
->bdev
->bd_contains
==
4423 rdev2
->bdev
->bd_contains
) {
4425 "%s: WARNING: %s appears to be"
4426 " on the same physical disk as"
4429 bdevname(rdev
->bdev
,b
),
4430 bdevname(rdev2
->bdev
,b2
));
4437 "True protection against single-disk"
4438 " failure might be compromised.\n");
4441 mddev
->recovery
= 0;
4442 /* may be over-ridden by personality */
4443 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4445 mddev
->ok_start_degraded
= start_dirty_degraded
;
4447 if (start_readonly
&& mddev
->ro
== 0)
4448 mddev
->ro
= 2; /* read-only, but switch on first write */
4450 err
= mddev
->pers
->run(mddev
);
4452 printk(KERN_ERR
"md: pers->run() failed ...\n");
4453 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4454 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4455 " but 'external_size' not in effect?\n", __func__
);
4457 "md: invalid array_size %llu > default size %llu\n",
4458 (unsigned long long)mddev
->array_sectors
/ 2,
4459 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4461 mddev
->pers
->stop(mddev
);
4463 if (err
== 0 && mddev
->pers
->sync_request
) {
4464 err
= bitmap_create(mddev
);
4466 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4467 mdname(mddev
), err
);
4468 mddev
->pers
->stop(mddev
);
4472 module_put(mddev
->pers
->owner
);
4474 bitmap_destroy(mddev
);
4477 if (mddev
->pers
->sync_request
) {
4478 if (mddev
->kobj
.sd
&&
4479 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4481 "md: cannot register extra attributes for %s\n",
4483 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4484 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4487 atomic_set(&mddev
->writes_pending
,0);
4488 atomic_set(&mddev
->max_corr_read_errors
,
4489 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4490 mddev
->safemode
= 0;
4491 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4492 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4493 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4496 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4497 if (rdev
->raid_disk
>= 0) {
4499 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4500 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4501 /* failure here is OK */;
4504 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4507 md_update_sb(mddev
, 0);
4509 md_wakeup_thread(mddev
->thread
);
4510 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4512 md_new_event(mddev
);
4513 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4514 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4515 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4518 EXPORT_SYMBOL_GPL(md_run
);
4520 static int do_md_run(mddev_t
*mddev
)
4524 err
= md_run(mddev
);
4527 err
= bitmap_load(mddev
);
4529 bitmap_destroy(mddev
);
4532 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4533 revalidate_disk(mddev
->gendisk
);
4534 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4539 static int restart_array(mddev_t
*mddev
)
4541 struct gendisk
*disk
= mddev
->gendisk
;
4543 /* Complain if it has no devices */
4544 if (list_empty(&mddev
->disks
))
4550 mddev
->safemode
= 0;
4552 set_disk_ro(disk
, 0);
4553 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4555 /* Kick recovery or resync if necessary */
4556 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4557 md_wakeup_thread(mddev
->thread
);
4558 md_wakeup_thread(mddev
->sync_thread
);
4559 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4563 /* similar to deny_write_access, but accounts for our holding a reference
4564 * to the file ourselves */
4565 static int deny_bitmap_write_access(struct file
* file
)
4567 struct inode
*inode
= file
->f_mapping
->host
;
4569 spin_lock(&inode
->i_lock
);
4570 if (atomic_read(&inode
->i_writecount
) > 1) {
4571 spin_unlock(&inode
->i_lock
);
4574 atomic_set(&inode
->i_writecount
, -1);
4575 spin_unlock(&inode
->i_lock
);
4580 void restore_bitmap_write_access(struct file
*file
)
4582 struct inode
*inode
= file
->f_mapping
->host
;
4584 spin_lock(&inode
->i_lock
);
4585 atomic_set(&inode
->i_writecount
, 1);
4586 spin_unlock(&inode
->i_lock
);
4589 static void md_clean(mddev_t
*mddev
)
4591 mddev
->array_sectors
= 0;
4592 mddev
->external_size
= 0;
4593 mddev
->dev_sectors
= 0;
4594 mddev
->raid_disks
= 0;
4595 mddev
->recovery_cp
= 0;
4596 mddev
->resync_min
= 0;
4597 mddev
->resync_max
= MaxSector
;
4598 mddev
->reshape_position
= MaxSector
;
4599 mddev
->external
= 0;
4600 mddev
->persistent
= 0;
4601 mddev
->level
= LEVEL_NONE
;
4602 mddev
->clevel
[0] = 0;
4605 mddev
->metadata_type
[0] = 0;
4606 mddev
->chunk_sectors
= 0;
4607 mddev
->ctime
= mddev
->utime
= 0;
4609 mddev
->max_disks
= 0;
4611 mddev
->can_decrease_events
= 0;
4612 mddev
->delta_disks
= 0;
4613 mddev
->new_level
= LEVEL_NONE
;
4614 mddev
->new_layout
= 0;
4615 mddev
->new_chunk_sectors
= 0;
4616 mddev
->curr_resync
= 0;
4617 mddev
->resync_mismatches
= 0;
4618 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4619 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4620 mddev
->recovery
= 0;
4622 mddev
->degraded
= 0;
4623 mddev
->safemode
= 0;
4624 mddev
->bitmap_info
.offset
= 0;
4625 mddev
->bitmap_info
.default_offset
= 0;
4626 mddev
->bitmap_info
.chunksize
= 0;
4627 mddev
->bitmap_info
.daemon_sleep
= 0;
4628 mddev
->bitmap_info
.max_write_behind
= 0;
4632 void md_stop_writes(mddev_t
*mddev
)
4634 if (mddev
->sync_thread
) {
4635 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4636 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4637 md_unregister_thread(mddev
->sync_thread
);
4638 mddev
->sync_thread
= NULL
;
4641 del_timer_sync(&mddev
->safemode_timer
);
4643 bitmap_flush(mddev
);
4644 md_super_wait(mddev
);
4646 if (!mddev
->in_sync
|| mddev
->flags
) {
4647 /* mark array as shutdown cleanly */
4649 md_update_sb(mddev
, 1);
4652 EXPORT_SYMBOL_GPL(md_stop_writes
);
4654 void md_stop(mddev_t
*mddev
)
4656 mddev
->pers
->stop(mddev
);
4657 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4658 mddev
->to_remove
= &md_redundancy_group
;
4659 module_put(mddev
->pers
->owner
);
4661 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4663 EXPORT_SYMBOL_GPL(md_stop
);
4665 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4668 mutex_lock(&mddev
->open_mutex
);
4669 if (atomic_read(&mddev
->openers
) > is_open
) {
4670 printk("md: %s still in use.\n",mdname(mddev
));
4675 md_stop_writes(mddev
);
4681 set_disk_ro(mddev
->gendisk
, 1);
4682 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4683 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4687 mutex_unlock(&mddev
->open_mutex
);
4692 * 0 - completely stop and dis-assemble array
4693 * 2 - stop but do not disassemble array
4695 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4697 struct gendisk
*disk
= mddev
->gendisk
;
4700 mutex_lock(&mddev
->open_mutex
);
4701 if (atomic_read(&mddev
->openers
) > is_open
||
4702 mddev
->sysfs_active
) {
4703 printk("md: %s still in use.\n",mdname(mddev
));
4704 mutex_unlock(&mddev
->open_mutex
);
4710 set_disk_ro(disk
, 0);
4712 md_stop_writes(mddev
);
4714 mddev
->queue
->merge_bvec_fn
= NULL
;
4715 mddev
->queue
->unplug_fn
= NULL
;
4716 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4718 /* tell userspace to handle 'inactive' */
4719 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4721 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4722 if (rdev
->raid_disk
>= 0) {
4724 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4725 sysfs_remove_link(&mddev
->kobj
, nm
);
4728 set_capacity(disk
, 0);
4729 mutex_unlock(&mddev
->open_mutex
);
4730 revalidate_disk(disk
);
4735 mutex_unlock(&mddev
->open_mutex
);
4737 * Free resources if final stop
4740 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4742 bitmap_destroy(mddev
);
4743 if (mddev
->bitmap_info
.file
) {
4744 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4745 fput(mddev
->bitmap_info
.file
);
4746 mddev
->bitmap_info
.file
= NULL
;
4748 mddev
->bitmap_info
.offset
= 0;
4750 export_array(mddev
);
4753 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4754 if (mddev
->hold_active
== UNTIL_STOP
)
4755 mddev
->hold_active
= 0;
4757 blk_integrity_unregister(disk
);
4758 md_new_event(mddev
);
4759 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4764 static void autorun_array(mddev_t
*mddev
)
4769 if (list_empty(&mddev
->disks
))
4772 printk(KERN_INFO
"md: running: ");
4774 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4775 char b
[BDEVNAME_SIZE
];
4776 printk("<%s>", bdevname(rdev
->bdev
,b
));
4780 err
= do_md_run(mddev
);
4782 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4783 do_md_stop(mddev
, 0, 0);
4788 * lets try to run arrays based on all disks that have arrived
4789 * until now. (those are in pending_raid_disks)
4791 * the method: pick the first pending disk, collect all disks with
4792 * the same UUID, remove all from the pending list and put them into
4793 * the 'same_array' list. Then order this list based on superblock
4794 * update time (freshest comes first), kick out 'old' disks and
4795 * compare superblocks. If everything's fine then run it.
4797 * If "unit" is allocated, then bump its reference count
4799 static void autorun_devices(int part
)
4801 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4803 char b
[BDEVNAME_SIZE
];
4805 printk(KERN_INFO
"md: autorun ...\n");
4806 while (!list_empty(&pending_raid_disks
)) {
4809 LIST_HEAD(candidates
);
4810 rdev0
= list_entry(pending_raid_disks
.next
,
4811 mdk_rdev_t
, same_set
);
4813 printk(KERN_INFO
"md: considering %s ...\n",
4814 bdevname(rdev0
->bdev
,b
));
4815 INIT_LIST_HEAD(&candidates
);
4816 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4817 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4818 printk(KERN_INFO
"md: adding %s ...\n",
4819 bdevname(rdev
->bdev
,b
));
4820 list_move(&rdev
->same_set
, &candidates
);
4823 * now we have a set of devices, with all of them having
4824 * mostly sane superblocks. It's time to allocate the
4828 dev
= MKDEV(mdp_major
,
4829 rdev0
->preferred_minor
<< MdpMinorShift
);
4830 unit
= MINOR(dev
) >> MdpMinorShift
;
4832 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4835 if (rdev0
->preferred_minor
!= unit
) {
4836 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4837 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4841 md_probe(dev
, NULL
, NULL
);
4842 mddev
= mddev_find(dev
);
4843 if (!mddev
|| !mddev
->gendisk
) {
4847 "md: cannot allocate memory for md drive.\n");
4850 if (mddev_lock(mddev
))
4851 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4853 else if (mddev
->raid_disks
|| mddev
->major_version
4854 || !list_empty(&mddev
->disks
)) {
4856 "md: %s already running, cannot run %s\n",
4857 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4858 mddev_unlock(mddev
);
4860 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4861 mddev
->persistent
= 1;
4862 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4863 list_del_init(&rdev
->same_set
);
4864 if (bind_rdev_to_array(rdev
, mddev
))
4867 autorun_array(mddev
);
4868 mddev_unlock(mddev
);
4870 /* on success, candidates will be empty, on error
4873 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4874 list_del_init(&rdev
->same_set
);
4879 printk(KERN_INFO
"md: ... autorun DONE.\n");
4881 #endif /* !MODULE */
4883 static int get_version(void __user
* arg
)
4887 ver
.major
= MD_MAJOR_VERSION
;
4888 ver
.minor
= MD_MINOR_VERSION
;
4889 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4891 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4897 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4899 mdu_array_info_t info
;
4900 int nr
,working
,insync
,failed
,spare
;
4903 nr
=working
=insync
=failed
=spare
=0;
4904 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4906 if (test_bit(Faulty
, &rdev
->flags
))
4910 if (test_bit(In_sync
, &rdev
->flags
))
4917 info
.major_version
= mddev
->major_version
;
4918 info
.minor_version
= mddev
->minor_version
;
4919 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4920 info
.ctime
= mddev
->ctime
;
4921 info
.level
= mddev
->level
;
4922 info
.size
= mddev
->dev_sectors
/ 2;
4923 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4926 info
.raid_disks
= mddev
->raid_disks
;
4927 info
.md_minor
= mddev
->md_minor
;
4928 info
.not_persistent
= !mddev
->persistent
;
4930 info
.utime
= mddev
->utime
;
4933 info
.state
= (1<<MD_SB_CLEAN
);
4934 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
4935 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4936 info
.active_disks
= insync
;
4937 info
.working_disks
= working
;
4938 info
.failed_disks
= failed
;
4939 info
.spare_disks
= spare
;
4941 info
.layout
= mddev
->layout
;
4942 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
4944 if (copy_to_user(arg
, &info
, sizeof(info
)))
4950 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4952 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4953 char *ptr
, *buf
= NULL
;
4956 if (md_allow_write(mddev
))
4957 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4959 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4964 /* bitmap disabled, zero the first byte and copy out */
4965 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4966 file
->pathname
[0] = '\0';
4970 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4974 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4978 strcpy(file
->pathname
, ptr
);
4982 if (copy_to_user(arg
, file
, sizeof(*file
)))
4990 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4992 mdu_disk_info_t info
;
4995 if (copy_from_user(&info
, arg
, sizeof(info
)))
4998 rdev
= find_rdev_nr(mddev
, info
.number
);
5000 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5001 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5002 info
.raid_disk
= rdev
->raid_disk
;
5004 if (test_bit(Faulty
, &rdev
->flags
))
5005 info
.state
|= (1<<MD_DISK_FAULTY
);
5006 else if (test_bit(In_sync
, &rdev
->flags
)) {
5007 info
.state
|= (1<<MD_DISK_ACTIVE
);
5008 info
.state
|= (1<<MD_DISK_SYNC
);
5010 if (test_bit(WriteMostly
, &rdev
->flags
))
5011 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5013 info
.major
= info
.minor
= 0;
5014 info
.raid_disk
= -1;
5015 info
.state
= (1<<MD_DISK_REMOVED
);
5018 if (copy_to_user(arg
, &info
, sizeof(info
)))
5024 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5026 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5028 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5030 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5033 if (!mddev
->raid_disks
) {
5035 /* expecting a device which has a superblock */
5036 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5039 "md: md_import_device returned %ld\n",
5041 return PTR_ERR(rdev
);
5043 if (!list_empty(&mddev
->disks
)) {
5044 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5045 mdk_rdev_t
, same_set
);
5046 err
= super_types
[mddev
->major_version
]
5047 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5050 "md: %s has different UUID to %s\n",
5051 bdevname(rdev
->bdev
,b
),
5052 bdevname(rdev0
->bdev
,b2
));
5057 err
= bind_rdev_to_array(rdev
, mddev
);
5064 * add_new_disk can be used once the array is assembled
5065 * to add "hot spares". They must already have a superblock
5070 if (!mddev
->pers
->hot_add_disk
) {
5072 "%s: personality does not support diskops!\n",
5076 if (mddev
->persistent
)
5077 rdev
= md_import_device(dev
, mddev
->major_version
,
5078 mddev
->minor_version
);
5080 rdev
= md_import_device(dev
, -1, -1);
5083 "md: md_import_device returned %ld\n",
5085 return PTR_ERR(rdev
);
5087 /* set save_raid_disk if appropriate */
5088 if (!mddev
->persistent
) {
5089 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5090 info
->raid_disk
< mddev
->raid_disks
)
5091 rdev
->raid_disk
= info
->raid_disk
;
5093 rdev
->raid_disk
= -1;
5095 super_types
[mddev
->major_version
].
5096 validate_super(mddev
, rdev
);
5097 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5099 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5100 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5101 set_bit(WriteMostly
, &rdev
->flags
);
5103 clear_bit(WriteMostly
, &rdev
->flags
);
5105 rdev
->raid_disk
= -1;
5106 err
= bind_rdev_to_array(rdev
, mddev
);
5107 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5108 /* If there is hot_add_disk but no hot_remove_disk
5109 * then added disks for geometry changes,
5110 * and should be added immediately.
5112 super_types
[mddev
->major_version
].
5113 validate_super(mddev
, rdev
);
5114 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5116 unbind_rdev_from_array(rdev
);
5121 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5123 md_update_sb(mddev
, 1);
5124 if (mddev
->degraded
)
5125 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5126 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5127 md_wakeup_thread(mddev
->thread
);
5131 /* otherwise, add_new_disk is only allowed
5132 * for major_version==0 superblocks
5134 if (mddev
->major_version
!= 0) {
5135 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5140 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5142 rdev
= md_import_device(dev
, -1, 0);
5145 "md: error, md_import_device() returned %ld\n",
5147 return PTR_ERR(rdev
);
5149 rdev
->desc_nr
= info
->number
;
5150 if (info
->raid_disk
< mddev
->raid_disks
)
5151 rdev
->raid_disk
= info
->raid_disk
;
5153 rdev
->raid_disk
= -1;
5155 if (rdev
->raid_disk
< mddev
->raid_disks
)
5156 if (info
->state
& (1<<MD_DISK_SYNC
))
5157 set_bit(In_sync
, &rdev
->flags
);
5159 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5160 set_bit(WriteMostly
, &rdev
->flags
);
5162 if (!mddev
->persistent
) {
5163 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5164 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5166 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5167 rdev
->sectors
= rdev
->sb_start
;
5169 err
= bind_rdev_to_array(rdev
, mddev
);
5179 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5181 char b
[BDEVNAME_SIZE
];
5184 rdev
= find_rdev(mddev
, dev
);
5188 if (rdev
->raid_disk
>= 0)
5191 kick_rdev_from_array(rdev
);
5192 md_update_sb(mddev
, 1);
5193 md_new_event(mddev
);
5197 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5198 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5202 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5204 char b
[BDEVNAME_SIZE
];
5211 if (mddev
->major_version
!= 0) {
5212 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5213 " version-0 superblocks.\n",
5217 if (!mddev
->pers
->hot_add_disk
) {
5219 "%s: personality does not support diskops!\n",
5224 rdev
= md_import_device(dev
, -1, 0);
5227 "md: error, md_import_device() returned %ld\n",
5232 if (mddev
->persistent
)
5233 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5235 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5237 rdev
->sectors
= rdev
->sb_start
;
5239 if (test_bit(Faulty
, &rdev
->flags
)) {
5241 "md: can not hot-add faulty %s disk to %s!\n",
5242 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5246 clear_bit(In_sync
, &rdev
->flags
);
5248 rdev
->saved_raid_disk
= -1;
5249 err
= bind_rdev_to_array(rdev
, mddev
);
5254 * The rest should better be atomic, we can have disk failures
5255 * noticed in interrupt contexts ...
5258 rdev
->raid_disk
= -1;
5260 md_update_sb(mddev
, 1);
5263 * Kick recovery, maybe this spare has to be added to the
5264 * array immediately.
5266 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5267 md_wakeup_thread(mddev
->thread
);
5268 md_new_event(mddev
);
5276 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5281 if (!mddev
->pers
->quiesce
)
5283 if (mddev
->recovery
|| mddev
->sync_thread
)
5285 /* we should be able to change the bitmap.. */
5291 return -EEXIST
; /* cannot add when bitmap is present */
5292 mddev
->bitmap_info
.file
= fget(fd
);
5294 if (mddev
->bitmap_info
.file
== NULL
) {
5295 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5300 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5302 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5304 fput(mddev
->bitmap_info
.file
);
5305 mddev
->bitmap_info
.file
= NULL
;
5308 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5309 } else if (mddev
->bitmap
== NULL
)
5310 return -ENOENT
; /* cannot remove what isn't there */
5313 mddev
->pers
->quiesce(mddev
, 1);
5315 err
= bitmap_create(mddev
);
5317 err
= bitmap_load(mddev
);
5319 if (fd
< 0 || err
) {
5320 bitmap_destroy(mddev
);
5321 fd
= -1; /* make sure to put the file */
5323 mddev
->pers
->quiesce(mddev
, 0);
5326 if (mddev
->bitmap_info
.file
) {
5327 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5328 fput(mddev
->bitmap_info
.file
);
5330 mddev
->bitmap_info
.file
= NULL
;
5337 * set_array_info is used two different ways
5338 * The original usage is when creating a new array.
5339 * In this usage, raid_disks is > 0 and it together with
5340 * level, size, not_persistent,layout,chunksize determine the
5341 * shape of the array.
5342 * This will always create an array with a type-0.90.0 superblock.
5343 * The newer usage is when assembling an array.
5344 * In this case raid_disks will be 0, and the major_version field is
5345 * use to determine which style super-blocks are to be found on the devices.
5346 * The minor and patch _version numbers are also kept incase the
5347 * super_block handler wishes to interpret them.
5349 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5352 if (info
->raid_disks
== 0) {
5353 /* just setting version number for superblock loading */
5354 if (info
->major_version
< 0 ||
5355 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5356 super_types
[info
->major_version
].name
== NULL
) {
5357 /* maybe try to auto-load a module? */
5359 "md: superblock version %d not known\n",
5360 info
->major_version
);
5363 mddev
->major_version
= info
->major_version
;
5364 mddev
->minor_version
= info
->minor_version
;
5365 mddev
->patch_version
= info
->patch_version
;
5366 mddev
->persistent
= !info
->not_persistent
;
5367 /* ensure mddev_put doesn't delete this now that there
5368 * is some minimal configuration.
5370 mddev
->ctime
= get_seconds();
5373 mddev
->major_version
= MD_MAJOR_VERSION
;
5374 mddev
->minor_version
= MD_MINOR_VERSION
;
5375 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5376 mddev
->ctime
= get_seconds();
5378 mddev
->level
= info
->level
;
5379 mddev
->clevel
[0] = 0;
5380 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5381 mddev
->raid_disks
= info
->raid_disks
;
5382 /* don't set md_minor, it is determined by which /dev/md* was
5385 if (info
->state
& (1<<MD_SB_CLEAN
))
5386 mddev
->recovery_cp
= MaxSector
;
5388 mddev
->recovery_cp
= 0;
5389 mddev
->persistent
= ! info
->not_persistent
;
5390 mddev
->external
= 0;
5392 mddev
->layout
= info
->layout
;
5393 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5395 mddev
->max_disks
= MD_SB_DISKS
;
5397 if (mddev
->persistent
)
5399 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5401 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5402 mddev
->bitmap_info
.offset
= 0;
5404 mddev
->reshape_position
= MaxSector
;
5407 * Generate a 128 bit UUID
5409 get_random_bytes(mddev
->uuid
, 16);
5411 mddev
->new_level
= mddev
->level
;
5412 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5413 mddev
->new_layout
= mddev
->layout
;
5414 mddev
->delta_disks
= 0;
5419 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5421 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5423 if (mddev
->external_size
)
5426 mddev
->array_sectors
= array_sectors
;
5428 EXPORT_SYMBOL(md_set_array_sectors
);
5430 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5434 int fit
= (num_sectors
== 0);
5436 if (mddev
->pers
->resize
== NULL
)
5438 /* The "num_sectors" is the number of sectors of each device that
5439 * is used. This can only make sense for arrays with redundancy.
5440 * linear and raid0 always use whatever space is available. We can only
5441 * consider changing this number if no resync or reconstruction is
5442 * happening, and if the new size is acceptable. It must fit before the
5443 * sb_start or, if that is <data_offset, it must fit before the size
5444 * of each device. If num_sectors is zero, we find the largest size
5448 if (mddev
->sync_thread
)
5451 /* Sorry, cannot grow a bitmap yet, just remove it,
5455 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5456 sector_t avail
= rdev
->sectors
;
5458 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5459 num_sectors
= avail
;
5460 if (avail
< num_sectors
)
5463 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5465 revalidate_disk(mddev
->gendisk
);
5469 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5472 /* change the number of raid disks */
5473 if (mddev
->pers
->check_reshape
== NULL
)
5475 if (raid_disks
<= 0 ||
5476 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5478 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5480 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5482 rv
= mddev
->pers
->check_reshape(mddev
);
5488 * update_array_info is used to change the configuration of an
5490 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5491 * fields in the info are checked against the array.
5492 * Any differences that cannot be handled will cause an error.
5493 * Normally, only one change can be managed at a time.
5495 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5501 /* calculate expected state,ignoring low bits */
5502 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5503 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5505 if (mddev
->major_version
!= info
->major_version
||
5506 mddev
->minor_version
!= info
->minor_version
||
5507 /* mddev->patch_version != info->patch_version || */
5508 mddev
->ctime
!= info
->ctime
||
5509 mddev
->level
!= info
->level
||
5510 /* mddev->layout != info->layout || */
5511 !mddev
->persistent
!= info
->not_persistent
||
5512 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5513 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5514 ((state
^info
->state
) & 0xfffffe00)
5517 /* Check there is only one change */
5518 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5520 if (mddev
->raid_disks
!= info
->raid_disks
)
5522 if (mddev
->layout
!= info
->layout
)
5524 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5531 if (mddev
->layout
!= info
->layout
) {
5533 * we don't need to do anything at the md level, the
5534 * personality will take care of it all.
5536 if (mddev
->pers
->check_reshape
== NULL
)
5539 mddev
->new_layout
= info
->layout
;
5540 rv
= mddev
->pers
->check_reshape(mddev
);
5542 mddev
->new_layout
= mddev
->layout
;
5546 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5547 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5549 if (mddev
->raid_disks
!= info
->raid_disks
)
5550 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5552 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5553 if (mddev
->pers
->quiesce
== NULL
)
5555 if (mddev
->recovery
|| mddev
->sync_thread
)
5557 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5558 /* add the bitmap */
5561 if (mddev
->bitmap_info
.default_offset
== 0)
5563 mddev
->bitmap_info
.offset
=
5564 mddev
->bitmap_info
.default_offset
;
5565 mddev
->pers
->quiesce(mddev
, 1);
5566 rv
= bitmap_create(mddev
);
5568 rv
= bitmap_load(mddev
);
5570 bitmap_destroy(mddev
);
5571 mddev
->pers
->quiesce(mddev
, 0);
5573 /* remove the bitmap */
5576 if (mddev
->bitmap
->file
)
5578 mddev
->pers
->quiesce(mddev
, 1);
5579 bitmap_destroy(mddev
);
5580 mddev
->pers
->quiesce(mddev
, 0);
5581 mddev
->bitmap_info
.offset
= 0;
5584 md_update_sb(mddev
, 1);
5588 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5592 if (mddev
->pers
== NULL
)
5595 rdev
= find_rdev(mddev
, dev
);
5599 md_error(mddev
, rdev
);
5604 * We have a problem here : there is no easy way to give a CHS
5605 * virtual geometry. We currently pretend that we have a 2 heads
5606 * 4 sectors (with a BIG number of cylinders...). This drives
5607 * dosfs just mad... ;-)
5609 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5611 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5615 geo
->cylinders
= mddev
->array_sectors
/ 8;
5619 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5620 unsigned int cmd
, unsigned long arg
)
5623 void __user
*argp
= (void __user
*)arg
;
5624 mddev_t
*mddev
= NULL
;
5627 if (!capable(CAP_SYS_ADMIN
))
5631 * Commands dealing with the RAID driver but not any
5637 err
= get_version(argp
);
5640 case PRINT_RAID_DEBUG
:
5648 autostart_arrays(arg
);
5655 * Commands creating/starting a new array:
5658 mddev
= bdev
->bd_disk
->private_data
;
5665 err
= mddev_lock(mddev
);
5668 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5675 case SET_ARRAY_INFO
:
5677 mdu_array_info_t info
;
5679 memset(&info
, 0, sizeof(info
));
5680 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5685 err
= update_array_info(mddev
, &info
);
5687 printk(KERN_WARNING
"md: couldn't update"
5688 " array info. %d\n", err
);
5693 if (!list_empty(&mddev
->disks
)) {
5695 "md: array %s already has disks!\n",
5700 if (mddev
->raid_disks
) {
5702 "md: array %s already initialised!\n",
5707 err
= set_array_info(mddev
, &info
);
5709 printk(KERN_WARNING
"md: couldn't set"
5710 " array info. %d\n", err
);
5720 * Commands querying/configuring an existing array:
5722 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5723 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5724 if ((!mddev
->raid_disks
&& !mddev
->external
)
5725 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5726 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5727 && cmd
!= GET_BITMAP_FILE
) {
5733 * Commands even a read-only array can execute:
5737 case GET_ARRAY_INFO
:
5738 err
= get_array_info(mddev
, argp
);
5741 case GET_BITMAP_FILE
:
5742 err
= get_bitmap_file(mddev
, argp
);
5746 err
= get_disk_info(mddev
, argp
);
5749 case RESTART_ARRAY_RW
:
5750 err
= restart_array(mddev
);
5754 err
= do_md_stop(mddev
, 0, 1);
5758 err
= md_set_readonly(mddev
, 1);
5762 if (get_user(ro
, (int __user
*)(arg
))) {
5768 /* if the bdev is going readonly the value of mddev->ro
5769 * does not matter, no writes are coming
5774 /* are we are already prepared for writes? */
5778 /* transitioning to readauto need only happen for
5779 * arrays that call md_write_start
5782 err
= restart_array(mddev
);
5785 set_disk_ro(mddev
->gendisk
, 0);
5792 * The remaining ioctls are changing the state of the
5793 * superblock, so we do not allow them on read-only arrays.
5794 * However non-MD ioctls (e.g. get-size) will still come through
5795 * here and hit the 'default' below, so only disallow
5796 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5798 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5799 if (mddev
->ro
== 2) {
5801 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5802 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5803 md_wakeup_thread(mddev
->thread
);
5814 mdu_disk_info_t info
;
5815 if (copy_from_user(&info
, argp
, sizeof(info
)))
5818 err
= add_new_disk(mddev
, &info
);
5822 case HOT_REMOVE_DISK
:
5823 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5827 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5830 case SET_DISK_FAULTY
:
5831 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5835 err
= do_md_run(mddev
);
5838 case SET_BITMAP_FILE
:
5839 err
= set_bitmap_file(mddev
, (int)arg
);
5849 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5851 mddev
->hold_active
= 0;
5852 mddev_unlock(mddev
);
5861 #ifdef CONFIG_COMPAT
5862 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5863 unsigned int cmd
, unsigned long arg
)
5866 case HOT_REMOVE_DISK
:
5868 case SET_DISK_FAULTY
:
5869 case SET_BITMAP_FILE
:
5870 /* These take in integer arg, do not convert */
5873 arg
= (unsigned long)compat_ptr(arg
);
5877 return md_ioctl(bdev
, mode
, cmd
, arg
);
5879 #endif /* CONFIG_COMPAT */
5881 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5884 * Succeed if we can lock the mddev, which confirms that
5885 * it isn't being stopped right now.
5887 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5890 mutex_lock(&md_mutex
);
5891 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5892 /* we are racing with mddev_put which is discarding this
5896 /* Wait until bdev->bd_disk is definitely gone */
5897 flush_scheduled_work();
5898 /* Then retry the open from the top */
5899 mutex_unlock(&md_mutex
);
5900 return -ERESTARTSYS
;
5902 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5904 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5908 atomic_inc(&mddev
->openers
);
5909 mutex_unlock(&mddev
->open_mutex
);
5911 check_disk_size_change(mddev
->gendisk
, bdev
);
5913 mutex_unlock(&md_mutex
);
5917 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5919 mddev_t
*mddev
= disk
->private_data
;
5922 mutex_lock(&md_mutex
);
5923 atomic_dec(&mddev
->openers
);
5925 mutex_unlock(&md_mutex
);
5929 static const struct block_device_operations md_fops
=
5931 .owner
= THIS_MODULE
,
5933 .release
= md_release
,
5935 #ifdef CONFIG_COMPAT
5936 .compat_ioctl
= md_compat_ioctl
,
5938 .getgeo
= md_getgeo
,
5941 static int md_thread(void * arg
)
5943 mdk_thread_t
*thread
= arg
;
5946 * md_thread is a 'system-thread', it's priority should be very
5947 * high. We avoid resource deadlocks individually in each
5948 * raid personality. (RAID5 does preallocation) We also use RR and
5949 * the very same RT priority as kswapd, thus we will never get
5950 * into a priority inversion deadlock.
5952 * we definitely have to have equal or higher priority than
5953 * bdflush, otherwise bdflush will deadlock if there are too
5954 * many dirty RAID5 blocks.
5957 allow_signal(SIGKILL
);
5958 while (!kthread_should_stop()) {
5960 /* We need to wait INTERRUPTIBLE so that
5961 * we don't add to the load-average.
5962 * That means we need to be sure no signals are
5965 if (signal_pending(current
))
5966 flush_signals(current
);
5968 wait_event_interruptible_timeout
5970 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5971 || kthread_should_stop(),
5974 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5976 thread
->run(thread
->mddev
);
5982 void md_wakeup_thread(mdk_thread_t
*thread
)
5985 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5986 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5987 wake_up(&thread
->wqueue
);
5991 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5994 mdk_thread_t
*thread
;
5996 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6000 init_waitqueue_head(&thread
->wqueue
);
6003 thread
->mddev
= mddev
;
6004 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6005 thread
->tsk
= kthread_run(md_thread
, thread
,
6007 mdname(thread
->mddev
),
6008 name
?: mddev
->pers
->name
);
6009 if (IS_ERR(thread
->tsk
)) {
6016 void md_unregister_thread(mdk_thread_t
*thread
)
6020 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6022 kthread_stop(thread
->tsk
);
6026 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6033 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6036 if (mddev
->external
)
6037 set_bit(Blocked
, &rdev
->flags
);
6039 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6041 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6042 __builtin_return_address(0),__builtin_return_address(1),
6043 __builtin_return_address(2),__builtin_return_address(3));
6047 if (!mddev
->pers
->error_handler
)
6049 mddev
->pers
->error_handler(mddev
,rdev
);
6050 if (mddev
->degraded
)
6051 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6052 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6053 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6054 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6055 md_wakeup_thread(mddev
->thread
);
6056 if (mddev
->event_work
.func
)
6057 schedule_work(&mddev
->event_work
);
6058 md_new_event_inintr(mddev
);
6061 /* seq_file implementation /proc/mdstat */
6063 static void status_unused(struct seq_file
*seq
)
6068 seq_printf(seq
, "unused devices: ");
6070 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6071 char b
[BDEVNAME_SIZE
];
6073 seq_printf(seq
, "%s ",
6074 bdevname(rdev
->bdev
,b
));
6077 seq_printf(seq
, "<none>");
6079 seq_printf(seq
, "\n");
6083 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6085 sector_t max_sectors
, resync
, res
;
6086 unsigned long dt
, db
;
6089 unsigned int per_milli
;
6091 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6093 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6094 max_sectors
= mddev
->resync_max_sectors
;
6096 max_sectors
= mddev
->dev_sectors
;
6099 * Should not happen.
6105 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6106 * in a sector_t, and (max_sectors>>scale) will fit in a
6107 * u32, as those are the requirements for sector_div.
6108 * Thus 'scale' must be at least 10
6111 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6112 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6115 res
= (resync
>>scale
)*1000;
6116 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6120 int i
, x
= per_milli
/50, y
= 20-x
;
6121 seq_printf(seq
, "[");
6122 for (i
= 0; i
< x
; i
++)
6123 seq_printf(seq
, "=");
6124 seq_printf(seq
, ">");
6125 for (i
= 0; i
< y
; i
++)
6126 seq_printf(seq
, ".");
6127 seq_printf(seq
, "] ");
6129 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6130 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6132 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6134 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6135 "resync" : "recovery"))),
6136 per_milli
/10, per_milli
% 10,
6137 (unsigned long long) resync
/2,
6138 (unsigned long long) max_sectors
/2);
6141 * dt: time from mark until now
6142 * db: blocks written from mark until now
6143 * rt: remaining time
6145 * rt is a sector_t, so could be 32bit or 64bit.
6146 * So we divide before multiply in case it is 32bit and close
6148 * We scale the divisor (db) by 32 to avoid loosing precision
6149 * near the end of resync when the number of remaining sectors
6151 * We then divide rt by 32 after multiplying by db to compensate.
6152 * The '+1' avoids division by zero if db is very small.
6154 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6156 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6157 - mddev
->resync_mark_cnt
;
6159 rt
= max_sectors
- resync
; /* number of remaining sectors */
6160 sector_div(rt
, db
/32+1);
6164 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6165 ((unsigned long)rt
% 60)/6);
6167 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6170 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6172 struct list_head
*tmp
;
6182 spin_lock(&all_mddevs_lock
);
6183 list_for_each(tmp
,&all_mddevs
)
6185 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6187 spin_unlock(&all_mddevs_lock
);
6190 spin_unlock(&all_mddevs_lock
);
6192 return (void*)2;/* tail */
6196 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6198 struct list_head
*tmp
;
6199 mddev_t
*next_mddev
, *mddev
= v
;
6205 spin_lock(&all_mddevs_lock
);
6207 tmp
= all_mddevs
.next
;
6209 tmp
= mddev
->all_mddevs
.next
;
6210 if (tmp
!= &all_mddevs
)
6211 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6213 next_mddev
= (void*)2;
6216 spin_unlock(&all_mddevs_lock
);
6224 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6228 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6232 struct mdstat_info
{
6236 static int md_seq_show(struct seq_file
*seq
, void *v
)
6241 struct mdstat_info
*mi
= seq
->private;
6242 struct bitmap
*bitmap
;
6244 if (v
== (void*)1) {
6245 struct mdk_personality
*pers
;
6246 seq_printf(seq
, "Personalities : ");
6247 spin_lock(&pers_lock
);
6248 list_for_each_entry(pers
, &pers_list
, list
)
6249 seq_printf(seq
, "[%s] ", pers
->name
);
6251 spin_unlock(&pers_lock
);
6252 seq_printf(seq
, "\n");
6253 mi
->event
= atomic_read(&md_event_count
);
6256 if (v
== (void*)2) {
6261 if (mddev_lock(mddev
) < 0)
6264 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6265 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6266 mddev
->pers
? "" : "in");
6269 seq_printf(seq
, " (read-only)");
6271 seq_printf(seq
, " (auto-read-only)");
6272 seq_printf(seq
, " %s", mddev
->pers
->name
);
6276 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6277 char b
[BDEVNAME_SIZE
];
6278 seq_printf(seq
, " %s[%d]",
6279 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6280 if (test_bit(WriteMostly
, &rdev
->flags
))
6281 seq_printf(seq
, "(W)");
6282 if (test_bit(Faulty
, &rdev
->flags
)) {
6283 seq_printf(seq
, "(F)");
6285 } else if (rdev
->raid_disk
< 0)
6286 seq_printf(seq
, "(S)"); /* spare */
6287 sectors
+= rdev
->sectors
;
6290 if (!list_empty(&mddev
->disks
)) {
6292 seq_printf(seq
, "\n %llu blocks",
6293 (unsigned long long)
6294 mddev
->array_sectors
/ 2);
6296 seq_printf(seq
, "\n %llu blocks",
6297 (unsigned long long)sectors
/ 2);
6299 if (mddev
->persistent
) {
6300 if (mddev
->major_version
!= 0 ||
6301 mddev
->minor_version
!= 90) {
6302 seq_printf(seq
," super %d.%d",
6303 mddev
->major_version
,
6304 mddev
->minor_version
);
6306 } else if (mddev
->external
)
6307 seq_printf(seq
, " super external:%s",
6308 mddev
->metadata_type
);
6310 seq_printf(seq
, " super non-persistent");
6313 mddev
->pers
->status(seq
, mddev
);
6314 seq_printf(seq
, "\n ");
6315 if (mddev
->pers
->sync_request
) {
6316 if (mddev
->curr_resync
> 2) {
6317 status_resync(seq
, mddev
);
6318 seq_printf(seq
, "\n ");
6319 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6320 seq_printf(seq
, "\tresync=DELAYED\n ");
6321 else if (mddev
->recovery_cp
< MaxSector
)
6322 seq_printf(seq
, "\tresync=PENDING\n ");
6325 seq_printf(seq
, "\n ");
6327 if ((bitmap
= mddev
->bitmap
)) {
6328 unsigned long chunk_kb
;
6329 unsigned long flags
;
6330 spin_lock_irqsave(&bitmap
->lock
, flags
);
6331 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6332 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6334 bitmap
->pages
- bitmap
->missing_pages
,
6336 (bitmap
->pages
- bitmap
->missing_pages
)
6337 << (PAGE_SHIFT
- 10),
6338 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6339 chunk_kb
? "KB" : "B");
6341 seq_printf(seq
, ", file: ");
6342 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6345 seq_printf(seq
, "\n");
6346 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6349 seq_printf(seq
, "\n");
6351 mddev_unlock(mddev
);
6356 static const struct seq_operations md_seq_ops
= {
6357 .start
= md_seq_start
,
6358 .next
= md_seq_next
,
6359 .stop
= md_seq_stop
,
6360 .show
= md_seq_show
,
6363 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6366 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6370 error
= seq_open(file
, &md_seq_ops
);
6374 struct seq_file
*p
= file
->private_data
;
6376 mi
->event
= atomic_read(&md_event_count
);
6381 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6383 struct seq_file
*m
= filp
->private_data
;
6384 struct mdstat_info
*mi
= m
->private;
6387 poll_wait(filp
, &md_event_waiters
, wait
);
6389 /* always allow read */
6390 mask
= POLLIN
| POLLRDNORM
;
6392 if (mi
->event
!= atomic_read(&md_event_count
))
6393 mask
|= POLLERR
| POLLPRI
;
6397 static const struct file_operations md_seq_fops
= {
6398 .owner
= THIS_MODULE
,
6399 .open
= md_seq_open
,
6401 .llseek
= seq_lseek
,
6402 .release
= seq_release_private
,
6403 .poll
= mdstat_poll
,
6406 int register_md_personality(struct mdk_personality
*p
)
6408 spin_lock(&pers_lock
);
6409 list_add_tail(&p
->list
, &pers_list
);
6410 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6411 spin_unlock(&pers_lock
);
6415 int unregister_md_personality(struct mdk_personality
*p
)
6417 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6418 spin_lock(&pers_lock
);
6419 list_del_init(&p
->list
);
6420 spin_unlock(&pers_lock
);
6424 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6432 rdev_for_each_rcu(rdev
, mddev
) {
6433 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6434 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6435 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6436 atomic_read(&disk
->sync_io
);
6437 /* sync IO will cause sync_io to increase before the disk_stats
6438 * as sync_io is counted when a request starts, and
6439 * disk_stats is counted when it completes.
6440 * So resync activity will cause curr_events to be smaller than
6441 * when there was no such activity.
6442 * non-sync IO will cause disk_stat to increase without
6443 * increasing sync_io so curr_events will (eventually)
6444 * be larger than it was before. Once it becomes
6445 * substantially larger, the test below will cause
6446 * the array to appear non-idle, and resync will slow
6448 * If there is a lot of outstanding resync activity when
6449 * we set last_event to curr_events, then all that activity
6450 * completing might cause the array to appear non-idle
6451 * and resync will be slowed down even though there might
6452 * not have been non-resync activity. This will only
6453 * happen once though. 'last_events' will soon reflect
6454 * the state where there is little or no outstanding
6455 * resync requests, and further resync activity will
6456 * always make curr_events less than last_events.
6459 if (init
|| curr_events
- rdev
->last_events
> 64) {
6460 rdev
->last_events
= curr_events
;
6468 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6470 /* another "blocks" (512byte) blocks have been synced */
6471 atomic_sub(blocks
, &mddev
->recovery_active
);
6472 wake_up(&mddev
->recovery_wait
);
6474 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6475 md_wakeup_thread(mddev
->thread
);
6476 // stop recovery, signal do_sync ....
6481 /* md_write_start(mddev, bi)
6482 * If we need to update some array metadata (e.g. 'active' flag
6483 * in superblock) before writing, schedule a superblock update
6484 * and wait for it to complete.
6486 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6489 if (bio_data_dir(bi
) != WRITE
)
6492 BUG_ON(mddev
->ro
== 1);
6493 if (mddev
->ro
== 2) {
6494 /* need to switch to read/write */
6496 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6497 md_wakeup_thread(mddev
->thread
);
6498 md_wakeup_thread(mddev
->sync_thread
);
6501 atomic_inc(&mddev
->writes_pending
);
6502 if (mddev
->safemode
== 1)
6503 mddev
->safemode
= 0;
6504 if (mddev
->in_sync
) {
6505 spin_lock_irq(&mddev
->write_lock
);
6506 if (mddev
->in_sync
) {
6508 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6509 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6510 md_wakeup_thread(mddev
->thread
);
6513 spin_unlock_irq(&mddev
->write_lock
);
6516 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6517 wait_event(mddev
->sb_wait
,
6518 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6521 void md_write_end(mddev_t
*mddev
)
6523 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6524 if (mddev
->safemode
== 2)
6525 md_wakeup_thread(mddev
->thread
);
6526 else if (mddev
->safemode_delay
)
6527 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6531 /* md_allow_write(mddev)
6532 * Calling this ensures that the array is marked 'active' so that writes
6533 * may proceed without blocking. It is important to call this before
6534 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6535 * Must be called with mddev_lock held.
6537 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6538 * is dropped, so return -EAGAIN after notifying userspace.
6540 int md_allow_write(mddev_t
*mddev
)
6546 if (!mddev
->pers
->sync_request
)
6549 spin_lock_irq(&mddev
->write_lock
);
6550 if (mddev
->in_sync
) {
6552 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6553 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6554 if (mddev
->safemode_delay
&&
6555 mddev
->safemode
== 0)
6556 mddev
->safemode
= 1;
6557 spin_unlock_irq(&mddev
->write_lock
);
6558 md_update_sb(mddev
, 0);
6559 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6561 spin_unlock_irq(&mddev
->write_lock
);
6563 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6568 EXPORT_SYMBOL_GPL(md_allow_write
);
6570 void md_unplug(mddev_t
*mddev
)
6573 blk_unplug(mddev
->queue
);
6575 mddev
->plug
->unplug_fn(mddev
->plug
);
6578 #define SYNC_MARKS 10
6579 #define SYNC_MARK_STEP (3*HZ)
6580 void md_do_sync(mddev_t
*mddev
)
6583 unsigned int currspeed
= 0,
6585 sector_t max_sectors
,j
, io_sectors
;
6586 unsigned long mark
[SYNC_MARKS
];
6587 sector_t mark_cnt
[SYNC_MARKS
];
6589 struct list_head
*tmp
;
6590 sector_t last_check
;
6595 /* just incase thread restarts... */
6596 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6598 if (mddev
->ro
) /* never try to sync a read-only array */
6601 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6602 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6603 desc
= "data-check";
6604 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6605 desc
= "requested-resync";
6608 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6613 /* we overload curr_resync somewhat here.
6614 * 0 == not engaged in resync at all
6615 * 2 == checking that there is no conflict with another sync
6616 * 1 == like 2, but have yielded to allow conflicting resync to
6618 * other == active in resync - this many blocks
6620 * Before starting a resync we must have set curr_resync to
6621 * 2, and then checked that every "conflicting" array has curr_resync
6622 * less than ours. When we find one that is the same or higher
6623 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6624 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6625 * This will mean we have to start checking from the beginning again.
6630 mddev
->curr_resync
= 2;
6633 if (kthread_should_stop())
6634 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6636 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6638 for_each_mddev(mddev2
, tmp
) {
6639 if (mddev2
== mddev
)
6641 if (!mddev
->parallel_resync
6642 && mddev2
->curr_resync
6643 && match_mddev_units(mddev
, mddev2
)) {
6645 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6646 /* arbitrarily yield */
6647 mddev
->curr_resync
= 1;
6648 wake_up(&resync_wait
);
6650 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6651 /* no need to wait here, we can wait the next
6652 * time 'round when curr_resync == 2
6655 /* We need to wait 'interruptible' so as not to
6656 * contribute to the load average, and not to
6657 * be caught by 'softlockup'
6659 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6660 if (!kthread_should_stop() &&
6661 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6662 printk(KERN_INFO
"md: delaying %s of %s"
6663 " until %s has finished (they"
6664 " share one or more physical units)\n",
6665 desc
, mdname(mddev
), mdname(mddev2
));
6667 if (signal_pending(current
))
6668 flush_signals(current
);
6670 finish_wait(&resync_wait
, &wq
);
6673 finish_wait(&resync_wait
, &wq
);
6676 } while (mddev
->curr_resync
< 2);
6679 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6680 /* resync follows the size requested by the personality,
6681 * which defaults to physical size, but can be virtual size
6683 max_sectors
= mddev
->resync_max_sectors
;
6684 mddev
->resync_mismatches
= 0;
6685 /* we don't use the checkpoint if there's a bitmap */
6686 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6687 j
= mddev
->resync_min
;
6688 else if (!mddev
->bitmap
)
6689 j
= mddev
->recovery_cp
;
6691 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6692 max_sectors
= mddev
->dev_sectors
;
6694 /* recovery follows the physical size of devices */
6695 max_sectors
= mddev
->dev_sectors
;
6698 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6699 if (rdev
->raid_disk
>= 0 &&
6700 !test_bit(Faulty
, &rdev
->flags
) &&
6701 !test_bit(In_sync
, &rdev
->flags
) &&
6702 rdev
->recovery_offset
< j
)
6703 j
= rdev
->recovery_offset
;
6707 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6708 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6709 " %d KB/sec/disk.\n", speed_min(mddev
));
6710 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6711 "(but not more than %d KB/sec) for %s.\n",
6712 speed_max(mddev
), desc
);
6714 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6717 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6719 mark_cnt
[m
] = io_sectors
;
6722 mddev
->resync_mark
= mark
[last_mark
];
6723 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6726 * Tune reconstruction:
6728 window
= 32*(PAGE_SIZE
/512);
6729 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6730 window
/2,(unsigned long long) max_sectors
/2);
6732 atomic_set(&mddev
->recovery_active
, 0);
6737 "md: resuming %s of %s from checkpoint.\n",
6738 desc
, mdname(mddev
));
6739 mddev
->curr_resync
= j
;
6741 mddev
->curr_resync_completed
= mddev
->curr_resync
;
6743 while (j
< max_sectors
) {
6748 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6749 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6750 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6751 > (max_sectors
>> 4)) ||
6752 (j
- mddev
->curr_resync_completed
)*2
6753 >= mddev
->resync_max
- mddev
->curr_resync_completed
6755 /* time to update curr_resync_completed */
6757 wait_event(mddev
->recovery_wait
,
6758 atomic_read(&mddev
->recovery_active
) == 0);
6759 mddev
->curr_resync_completed
=
6761 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6762 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6765 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6766 /* As this condition is controlled by user-space,
6767 * we can block indefinitely, so use '_interruptible'
6768 * to avoid triggering warnings.
6770 flush_signals(current
); /* just in case */
6771 wait_event_interruptible(mddev
->recovery_wait
,
6772 mddev
->resync_max
> j
6773 || kthread_should_stop());
6776 if (kthread_should_stop())
6779 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6780 currspeed
< speed_min(mddev
));
6782 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6786 if (!skipped
) { /* actual IO requested */
6787 io_sectors
+= sectors
;
6788 atomic_add(sectors
, &mddev
->recovery_active
);
6792 if (j
>1) mddev
->curr_resync
= j
;
6793 mddev
->curr_mark_cnt
= io_sectors
;
6794 if (last_check
== 0)
6795 /* this is the earliers that rebuilt will be
6796 * visible in /proc/mdstat
6798 md_new_event(mddev
);
6800 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6803 last_check
= io_sectors
;
6805 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6809 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6811 int next
= (last_mark
+1) % SYNC_MARKS
;
6813 mddev
->resync_mark
= mark
[next
];
6814 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6815 mark
[next
] = jiffies
;
6816 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6821 if (kthread_should_stop())
6826 * this loop exits only if either when we are slower than
6827 * the 'hard' speed limit, or the system was IO-idle for
6829 * the system might be non-idle CPU-wise, but we only care
6830 * about not overloading the IO subsystem. (things like an
6831 * e2fsck being done on the RAID array should execute fast)
6836 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6837 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6839 if (currspeed
> speed_min(mddev
)) {
6840 if ((currspeed
> speed_max(mddev
)) ||
6841 !is_mddev_idle(mddev
, 0)) {
6847 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6849 * this also signals 'finished resyncing' to md_stop
6854 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6856 /* tell personality that we are finished */
6857 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6859 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6860 mddev
->curr_resync
> 2) {
6861 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6862 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6863 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6865 "md: checkpointing %s of %s.\n",
6866 desc
, mdname(mddev
));
6867 mddev
->recovery_cp
= mddev
->curr_resync
;
6870 mddev
->recovery_cp
= MaxSector
;
6872 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6873 mddev
->curr_resync
= MaxSector
;
6875 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6876 if (rdev
->raid_disk
>= 0 &&
6877 mddev
->delta_disks
>= 0 &&
6878 !test_bit(Faulty
, &rdev
->flags
) &&
6879 !test_bit(In_sync
, &rdev
->flags
) &&
6880 rdev
->recovery_offset
< mddev
->curr_resync
)
6881 rdev
->recovery_offset
= mddev
->curr_resync
;
6885 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6888 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6889 /* We completed so min/max setting can be forgotten if used. */
6890 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6891 mddev
->resync_min
= 0;
6892 mddev
->resync_max
= MaxSector
;
6893 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6894 mddev
->resync_min
= mddev
->curr_resync_completed
;
6895 mddev
->curr_resync
= 0;
6896 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6897 mddev
->curr_resync_completed
= 0;
6898 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6899 wake_up(&resync_wait
);
6900 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6901 md_wakeup_thread(mddev
->thread
);
6906 * got a signal, exit.
6909 "md: md_do_sync() got signal ... exiting\n");
6910 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6914 EXPORT_SYMBOL_GPL(md_do_sync
);
6917 static int remove_and_add_spares(mddev_t
*mddev
)
6922 mddev
->curr_resync_completed
= 0;
6924 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6925 if (rdev
->raid_disk
>= 0 &&
6926 !test_bit(Blocked
, &rdev
->flags
) &&
6927 (test_bit(Faulty
, &rdev
->flags
) ||
6928 ! test_bit(In_sync
, &rdev
->flags
)) &&
6929 atomic_read(&rdev
->nr_pending
)==0) {
6930 if (mddev
->pers
->hot_remove_disk(
6931 mddev
, rdev
->raid_disk
)==0) {
6933 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6934 sysfs_remove_link(&mddev
->kobj
, nm
);
6935 rdev
->raid_disk
= -1;
6939 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6940 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6941 if (rdev
->raid_disk
>= 0 &&
6942 !test_bit(In_sync
, &rdev
->flags
) &&
6943 !test_bit(Blocked
, &rdev
->flags
))
6945 if (rdev
->raid_disk
< 0
6946 && !test_bit(Faulty
, &rdev
->flags
)) {
6947 rdev
->recovery_offset
= 0;
6949 hot_add_disk(mddev
, rdev
) == 0) {
6951 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6952 if (sysfs_create_link(&mddev
->kobj
,
6954 /* failure here is OK */;
6956 md_new_event(mddev
);
6957 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6966 * This routine is regularly called by all per-raid-array threads to
6967 * deal with generic issues like resync and super-block update.
6968 * Raid personalities that don't have a thread (linear/raid0) do not
6969 * need this as they never do any recovery or update the superblock.
6971 * It does not do any resync itself, but rather "forks" off other threads
6972 * to do that as needed.
6973 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6974 * "->recovery" and create a thread at ->sync_thread.
6975 * When the thread finishes it sets MD_RECOVERY_DONE
6976 * and wakeups up this thread which will reap the thread and finish up.
6977 * This thread also removes any faulty devices (with nr_pending == 0).
6979 * The overall approach is:
6980 * 1/ if the superblock needs updating, update it.
6981 * 2/ If a recovery thread is running, don't do anything else.
6982 * 3/ If recovery has finished, clean up, possibly marking spares active.
6983 * 4/ If there are any faulty devices, remove them.
6984 * 5/ If array is degraded, try to add spares devices
6985 * 6/ If array has spares or is not in-sync, start a resync thread.
6987 void md_check_recovery(mddev_t
*mddev
)
6993 bitmap_daemon_work(mddev
);
6998 if (signal_pending(current
)) {
6999 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7000 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7002 mddev
->safemode
= 2;
7004 flush_signals(current
);
7007 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7010 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7011 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7012 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7013 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7014 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7015 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7019 if (mddev_trylock(mddev
)) {
7023 /* Only thing we do on a ro array is remove
7026 remove_and_add_spares(mddev
);
7027 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7031 if (!mddev
->external
) {
7033 spin_lock_irq(&mddev
->write_lock
);
7034 if (mddev
->safemode
&&
7035 !atomic_read(&mddev
->writes_pending
) &&
7037 mddev
->recovery_cp
== MaxSector
) {
7040 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7042 if (mddev
->safemode
== 1)
7043 mddev
->safemode
= 0;
7044 spin_unlock_irq(&mddev
->write_lock
);
7046 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7050 md_update_sb(mddev
, 0);
7052 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7053 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7054 /* resync/recovery still happening */
7055 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7058 if (mddev
->sync_thread
) {
7059 /* resync has finished, collect result */
7060 md_unregister_thread(mddev
->sync_thread
);
7061 mddev
->sync_thread
= NULL
;
7062 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7063 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7065 /* activate any spares */
7066 if (mddev
->pers
->spare_active(mddev
))
7067 sysfs_notify(&mddev
->kobj
, NULL
,
7070 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7071 mddev
->pers
->finish_reshape
)
7072 mddev
->pers
->finish_reshape(mddev
);
7073 md_update_sb(mddev
, 1);
7075 /* if array is no-longer degraded, then any saved_raid_disk
7076 * information must be scrapped
7078 if (!mddev
->degraded
)
7079 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7080 rdev
->saved_raid_disk
= -1;
7082 mddev
->recovery
= 0;
7083 /* flag recovery needed just to double check */
7084 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7085 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7086 md_new_event(mddev
);
7089 /* Set RUNNING before clearing NEEDED to avoid
7090 * any transients in the value of "sync_action".
7092 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7093 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7094 /* Clear some bits that don't mean anything, but
7097 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7098 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7100 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7102 /* no recovery is running.
7103 * remove any failed drives, then
7104 * add spares if possible.
7105 * Spare are also removed and re-added, to allow
7106 * the personality to fail the re-add.
7109 if (mddev
->reshape_position
!= MaxSector
) {
7110 if (mddev
->pers
->check_reshape
== NULL
||
7111 mddev
->pers
->check_reshape(mddev
) != 0)
7112 /* Cannot proceed */
7114 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7115 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7116 } else if ((spares
= remove_and_add_spares(mddev
))) {
7117 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7118 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7119 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7120 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7121 } else if (mddev
->recovery_cp
< MaxSector
) {
7122 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7123 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7124 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7125 /* nothing to be done ... */
7128 if (mddev
->pers
->sync_request
) {
7129 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7130 /* We are adding a device or devices to an array
7131 * which has the bitmap stored on all devices.
7132 * So make sure all bitmap pages get written
7134 bitmap_write_all(mddev
->bitmap
);
7136 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7139 if (!mddev
->sync_thread
) {
7140 printk(KERN_ERR
"%s: could not start resync"
7143 /* leave the spares where they are, it shouldn't hurt */
7144 mddev
->recovery
= 0;
7146 md_wakeup_thread(mddev
->sync_thread
);
7147 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7148 md_new_event(mddev
);
7151 if (!mddev
->sync_thread
) {
7152 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7153 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7155 if (mddev
->sysfs_action
)
7156 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7158 mddev_unlock(mddev
);
7162 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7164 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7165 wait_event_timeout(rdev
->blocked_wait
,
7166 !test_bit(Blocked
, &rdev
->flags
),
7167 msecs_to_jiffies(5000));
7168 rdev_dec_pending(rdev
, mddev
);
7170 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7172 static int md_notify_reboot(struct notifier_block
*this,
7173 unsigned long code
, void *x
)
7175 struct list_head
*tmp
;
7178 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7180 printk(KERN_INFO
"md: stopping all md devices.\n");
7182 for_each_mddev(mddev
, tmp
)
7183 if (mddev_trylock(mddev
)) {
7184 /* Force a switch to readonly even array
7185 * appears to still be in use. Hence
7188 md_set_readonly(mddev
, 100);
7189 mddev_unlock(mddev
);
7192 * certain more exotic SCSI devices are known to be
7193 * volatile wrt too early system reboots. While the
7194 * right place to handle this issue is the given
7195 * driver, we do want to have a safe RAID driver ...
7202 static struct notifier_block md_notifier
= {
7203 .notifier_call
= md_notify_reboot
,
7205 .priority
= INT_MAX
, /* before any real devices */
7208 static void md_geninit(void)
7210 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7212 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7215 static int __init
md_init(void)
7217 if (register_blkdev(MD_MAJOR
, "md"))
7219 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
7220 unregister_blkdev(MD_MAJOR
, "md");
7223 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7224 md_probe
, NULL
, NULL
);
7225 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7226 md_probe
, NULL
, NULL
);
7228 register_reboot_notifier(&md_notifier
);
7229 raid_table_header
= register_sysctl_table(raid_root_table
);
7239 * Searches all registered partitions for autorun RAID arrays
7243 static LIST_HEAD(all_detected_devices
);
7244 struct detected_devices_node
{
7245 struct list_head list
;
7249 void md_autodetect_dev(dev_t dev
)
7251 struct detected_devices_node
*node_detected_dev
;
7253 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7254 if (node_detected_dev
) {
7255 node_detected_dev
->dev
= dev
;
7256 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7258 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7259 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7264 static void autostart_arrays(int part
)
7267 struct detected_devices_node
*node_detected_dev
;
7269 int i_scanned
, i_passed
;
7274 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7276 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7278 node_detected_dev
= list_entry(all_detected_devices
.next
,
7279 struct detected_devices_node
, list
);
7280 list_del(&node_detected_dev
->list
);
7281 dev
= node_detected_dev
->dev
;
7282 kfree(node_detected_dev
);
7283 rdev
= md_import_device(dev
,0, 90);
7287 if (test_bit(Faulty
, &rdev
->flags
)) {
7291 set_bit(AutoDetected
, &rdev
->flags
);
7292 list_add(&rdev
->same_set
, &pending_raid_disks
);
7296 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7297 i_scanned
, i_passed
);
7299 autorun_devices(part
);
7302 #endif /* !MODULE */
7304 static __exit
void md_exit(void)
7307 struct list_head
*tmp
;
7309 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7310 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7312 unregister_blkdev(MD_MAJOR
,"md");
7313 unregister_blkdev(mdp_major
, "mdp");
7314 unregister_reboot_notifier(&md_notifier
);
7315 unregister_sysctl_table(raid_table_header
);
7316 remove_proc_entry("mdstat", NULL
);
7317 for_each_mddev(mddev
, tmp
) {
7318 export_array(mddev
);
7319 mddev
->hold_active
= 0;
7323 subsys_initcall(md_init
);
7324 module_exit(md_exit
)
7326 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7328 return sprintf(buffer
, "%d", start_readonly
);
7330 static int set_ro(const char *val
, struct kernel_param
*kp
)
7333 int num
= simple_strtoul(val
, &e
, 10);
7334 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7335 start_readonly
= num
;
7341 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7342 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7344 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7346 EXPORT_SYMBOL(register_md_personality
);
7347 EXPORT_SYMBOL(unregister_md_personality
);
7348 EXPORT_SYMBOL(md_error
);
7349 EXPORT_SYMBOL(md_done_sync
);
7350 EXPORT_SYMBOL(md_write_start
);
7351 EXPORT_SYMBOL(md_write_end
);
7352 EXPORT_SYMBOL(md_register_thread
);
7353 EXPORT_SYMBOL(md_unregister_thread
);
7354 EXPORT_SYMBOL(md_wakeup_thread
);
7355 EXPORT_SYMBOL(md_check_recovery
);
7356 MODULE_LICENSE("GPL");
7357 MODULE_DESCRIPTION("MD RAID framework");
7359 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);