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/smp_lock.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)))
62 static void autostart_arrays(int part
);
65 static LIST_HEAD(pers_list
);
66 static DEFINE_SPINLOCK(pers_lock
);
68 static void md_print_devices(void);
70 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
72 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
75 * Default number of read corrections we'll attempt on an rdev
76 * before ejecting it from the array. We divide the read error
77 * count by 2 for every hour elapsed between read errors.
79 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
81 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
82 * is 1000 KB/sec, so the extra system load does not show up that much.
83 * Increase it if you want to have more _guaranteed_ speed. Note that
84 * the RAID driver will use the maximum available bandwidth if the IO
85 * subsystem is idle. There is also an 'absolute maximum' reconstruction
86 * speed limit - in case reconstruction slows down your system despite
89 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
90 * or /sys/block/mdX/md/sync_speed_{min,max}
93 static int sysctl_speed_limit_min
= 1000;
94 static int sysctl_speed_limit_max
= 200000;
95 static inline int speed_min(mddev_t
*mddev
)
97 return mddev
->sync_speed_min
?
98 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
101 static inline int speed_max(mddev_t
*mddev
)
103 return mddev
->sync_speed_max
?
104 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
107 static struct ctl_table_header
*raid_table_header
;
109 static ctl_table raid_table
[] = {
111 .procname
= "speed_limit_min",
112 .data
= &sysctl_speed_limit_min
,
113 .maxlen
= sizeof(int),
114 .mode
= S_IRUGO
|S_IWUSR
,
115 .proc_handler
= proc_dointvec
,
118 .procname
= "speed_limit_max",
119 .data
= &sysctl_speed_limit_max
,
120 .maxlen
= sizeof(int),
121 .mode
= S_IRUGO
|S_IWUSR
,
122 .proc_handler
= proc_dointvec
,
127 static ctl_table raid_dir_table
[] = {
131 .mode
= S_IRUGO
|S_IXUGO
,
137 static ctl_table raid_root_table
[] = {
142 .child
= raid_dir_table
,
147 static const struct block_device_operations md_fops
;
149 static int start_readonly
;
152 * We have a system wide 'event count' that is incremented
153 * on any 'interesting' event, and readers of /proc/mdstat
154 * can use 'poll' or 'select' to find out when the event
158 * start array, stop array, error, add device, remove device,
159 * start build, activate spare
161 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
162 static atomic_t md_event_count
;
163 void md_new_event(mddev_t
*mddev
)
165 atomic_inc(&md_event_count
);
166 wake_up(&md_event_waiters
);
168 EXPORT_SYMBOL_GPL(md_new_event
);
170 /* Alternate version that can be called from interrupts
171 * when calling sysfs_notify isn't needed.
173 static void md_new_event_inintr(mddev_t
*mddev
)
175 atomic_inc(&md_event_count
);
176 wake_up(&md_event_waiters
);
180 * Enables to iterate over all existing md arrays
181 * all_mddevs_lock protects this list.
183 static LIST_HEAD(all_mddevs
);
184 static DEFINE_SPINLOCK(all_mddevs_lock
);
188 * iterates through all used mddevs in the system.
189 * We take care to grab the all_mddevs_lock whenever navigating
190 * the list, and to always hold a refcount when unlocked.
191 * Any code which breaks out of this loop while own
192 * a reference to the current mddev and must mddev_put it.
194 #define for_each_mddev(mddev,tmp) \
196 for (({ spin_lock(&all_mddevs_lock); \
197 tmp = all_mddevs.next; \
199 ({ if (tmp != &all_mddevs) \
200 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
201 spin_unlock(&all_mddevs_lock); \
202 if (mddev) mddev_put(mddev); \
203 mddev = list_entry(tmp, mddev_t, all_mddevs); \
204 tmp != &all_mddevs;}); \
205 ({ spin_lock(&all_mddevs_lock); \
210 /* Rather than calling directly into the personality make_request function,
211 * IO requests come here first so that we can check if the device is
212 * being suspended pending a reconfiguration.
213 * We hold a refcount over the call to ->make_request. By the time that
214 * call has finished, the bio has been linked into some internal structure
215 * and so is visible to ->quiesce(), so we don't need the refcount any more.
217 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
219 const int rw
= bio_data_dir(bio
);
220 mddev_t
*mddev
= q
->queuedata
;
224 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
229 if (mddev
->suspended
) {
232 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
233 TASK_UNINTERRUPTIBLE
);
234 if (!mddev
->suspended
)
240 finish_wait(&mddev
->sb_wait
, &__wait
);
242 atomic_inc(&mddev
->active_io
);
245 rv
= mddev
->pers
->make_request(mddev
, bio
);
247 cpu
= part_stat_lock();
248 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
249 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
],
253 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
254 wake_up(&mddev
->sb_wait
);
259 /* mddev_suspend makes sure no new requests are submitted
260 * to the device, and that any requests that have been submitted
261 * are completely handled.
262 * Once ->stop is called and completes, the module will be completely
265 void mddev_suspend(mddev_t
*mddev
)
267 BUG_ON(mddev
->suspended
);
268 mddev
->suspended
= 1;
270 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
271 mddev
->pers
->quiesce(mddev
, 1);
273 EXPORT_SYMBOL_GPL(mddev_suspend
);
275 void mddev_resume(mddev_t
*mddev
)
277 mddev
->suspended
= 0;
278 wake_up(&mddev
->sb_wait
);
279 mddev
->pers
->quiesce(mddev
, 0);
281 EXPORT_SYMBOL_GPL(mddev_resume
);
283 int mddev_congested(mddev_t
*mddev
, int bits
)
285 return mddev
->suspended
;
287 EXPORT_SYMBOL(mddev_congested
);
290 * Generic flush handling for md
293 static void md_end_flush(struct bio
*bio
, int err
)
295 mdk_rdev_t
*rdev
= bio
->bi_private
;
296 mddev_t
*mddev
= rdev
->mddev
;
298 rdev_dec_pending(rdev
, mddev
);
300 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
301 /* The pre-request flush has finished */
302 schedule_work(&mddev
->flush_work
);
307 static void submit_flushes(mddev_t
*mddev
)
312 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
313 if (rdev
->raid_disk
>= 0 &&
314 !test_bit(Faulty
, &rdev
->flags
)) {
315 /* Take two references, one is dropped
316 * when request finishes, one after
317 * we reclaim rcu_read_lock
320 atomic_inc(&rdev
->nr_pending
);
321 atomic_inc(&rdev
->nr_pending
);
323 bi
= bio_alloc(GFP_KERNEL
, 0);
324 bi
->bi_end_io
= md_end_flush
;
325 bi
->bi_private
= rdev
;
326 bi
->bi_bdev
= rdev
->bdev
;
327 atomic_inc(&mddev
->flush_pending
);
328 submit_bio(WRITE_FLUSH
, bi
);
330 rdev_dec_pending(rdev
, mddev
);
335 static void md_submit_flush_data(struct work_struct
*ws
)
337 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
338 struct bio
*bio
= mddev
->flush_bio
;
340 atomic_set(&mddev
->flush_pending
, 1);
342 if (bio
->bi_size
== 0)
343 /* an empty barrier - all done */
346 bio
->bi_rw
&= ~REQ_FLUSH
;
347 if (mddev
->pers
->make_request(mddev
, bio
))
348 generic_make_request(bio
);
350 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
351 mddev
->flush_bio
= NULL
;
352 wake_up(&mddev
->sb_wait
);
356 void md_flush_request(mddev_t
*mddev
, struct bio
*bio
)
358 spin_lock_irq(&mddev
->write_lock
);
359 wait_event_lock_irq(mddev
->sb_wait
,
361 mddev
->write_lock
, /*nothing*/);
362 mddev
->flush_bio
= bio
;
363 spin_unlock_irq(&mddev
->write_lock
);
365 atomic_set(&mddev
->flush_pending
, 1);
366 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
368 submit_flushes(mddev
);
370 if (atomic_dec_and_test(&mddev
->flush_pending
))
371 schedule_work(&mddev
->flush_work
);
373 EXPORT_SYMBOL(md_flush_request
);
375 /* Support for plugging.
376 * This mirrors the plugging support in request_queue, but does not
377 * require having a whole queue
379 static void plugger_work(struct work_struct
*work
)
381 struct plug_handle
*plug
=
382 container_of(work
, struct plug_handle
, unplug_work
);
383 plug
->unplug_fn(plug
);
385 static void plugger_timeout(unsigned long data
)
387 struct plug_handle
*plug
= (void *)data
;
388 kblockd_schedule_work(NULL
, &plug
->unplug_work
);
390 void plugger_init(struct plug_handle
*plug
,
391 void (*unplug_fn
)(struct plug_handle
*))
393 plug
->unplug_flag
= 0;
394 plug
->unplug_fn
= unplug_fn
;
395 init_timer(&plug
->unplug_timer
);
396 plug
->unplug_timer
.function
= plugger_timeout
;
397 plug
->unplug_timer
.data
= (unsigned long)plug
;
398 INIT_WORK(&plug
->unplug_work
, plugger_work
);
400 EXPORT_SYMBOL_GPL(plugger_init
);
402 void plugger_set_plug(struct plug_handle
*plug
)
404 if (!test_and_set_bit(PLUGGED_FLAG
, &plug
->unplug_flag
))
405 mod_timer(&plug
->unplug_timer
, jiffies
+ msecs_to_jiffies(3)+1);
407 EXPORT_SYMBOL_GPL(plugger_set_plug
);
409 int plugger_remove_plug(struct plug_handle
*plug
)
411 if (test_and_clear_bit(PLUGGED_FLAG
, &plug
->unplug_flag
)) {
412 del_timer(&plug
->unplug_timer
);
417 EXPORT_SYMBOL_GPL(plugger_remove_plug
);
420 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
422 atomic_inc(&mddev
->active
);
426 static void mddev_delayed_delete(struct work_struct
*ws
);
428 static void mddev_put(mddev_t
*mddev
)
430 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
432 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
433 mddev
->ctime
== 0 && !mddev
->hold_active
) {
434 /* Array is not configured at all, and not held active,
436 list_del(&mddev
->all_mddevs
);
437 if (mddev
->gendisk
) {
438 /* we did a probe so need to clean up.
439 * Call schedule_work inside the spinlock
440 * so that flush_scheduled_work() after
441 * mddev_find will succeed in waiting for the
444 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
445 schedule_work(&mddev
->del_work
);
449 spin_unlock(&all_mddevs_lock
);
452 void mddev_init(mddev_t
*mddev
)
454 mutex_init(&mddev
->open_mutex
);
455 mutex_init(&mddev
->reconfig_mutex
);
456 mutex_init(&mddev
->bitmap_info
.mutex
);
457 INIT_LIST_HEAD(&mddev
->disks
);
458 INIT_LIST_HEAD(&mddev
->all_mddevs
);
459 init_timer(&mddev
->safemode_timer
);
460 atomic_set(&mddev
->active
, 1);
461 atomic_set(&mddev
->openers
, 0);
462 atomic_set(&mddev
->active_io
, 0);
463 spin_lock_init(&mddev
->write_lock
);
464 atomic_set(&mddev
->flush_pending
, 0);
465 init_waitqueue_head(&mddev
->sb_wait
);
466 init_waitqueue_head(&mddev
->recovery_wait
);
467 mddev
->reshape_position
= MaxSector
;
468 mddev
->resync_min
= 0;
469 mddev
->resync_max
= MaxSector
;
470 mddev
->level
= LEVEL_NONE
;
472 EXPORT_SYMBOL_GPL(mddev_init
);
474 static mddev_t
* mddev_find(dev_t unit
)
476 mddev_t
*mddev
, *new = NULL
;
479 spin_lock(&all_mddevs_lock
);
482 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
483 if (mddev
->unit
== unit
) {
485 spin_unlock(&all_mddevs_lock
);
491 list_add(&new->all_mddevs
, &all_mddevs
);
492 spin_unlock(&all_mddevs_lock
);
493 new->hold_active
= UNTIL_IOCTL
;
497 /* find an unused unit number */
498 static int next_minor
= 512;
499 int start
= next_minor
;
503 dev
= MKDEV(MD_MAJOR
, next_minor
);
505 if (next_minor
> MINORMASK
)
507 if (next_minor
== start
) {
508 /* Oh dear, all in use. */
509 spin_unlock(&all_mddevs_lock
);
515 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
516 if (mddev
->unit
== dev
) {
522 new->md_minor
= MINOR(dev
);
523 new->hold_active
= UNTIL_STOP
;
524 list_add(&new->all_mddevs
, &all_mddevs
);
525 spin_unlock(&all_mddevs_lock
);
528 spin_unlock(&all_mddevs_lock
);
530 new = kzalloc(sizeof(*new), GFP_KERNEL
);
535 if (MAJOR(unit
) == MD_MAJOR
)
536 new->md_minor
= MINOR(unit
);
538 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
545 static inline int mddev_lock(mddev_t
* mddev
)
547 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
550 static inline int mddev_is_locked(mddev_t
*mddev
)
552 return mutex_is_locked(&mddev
->reconfig_mutex
);
555 static inline int mddev_trylock(mddev_t
* mddev
)
557 return mutex_trylock(&mddev
->reconfig_mutex
);
560 static struct attribute_group md_redundancy_group
;
562 static void mddev_unlock(mddev_t
* mddev
)
564 if (mddev
->to_remove
) {
565 /* These cannot be removed under reconfig_mutex as
566 * an access to the files will try to take reconfig_mutex
567 * while holding the file unremovable, which leads to
569 * So hold set sysfs_active while the remove in happeing,
570 * and anything else which might set ->to_remove or my
571 * otherwise change the sysfs namespace will fail with
572 * -EBUSY if sysfs_active is still set.
573 * We set sysfs_active under reconfig_mutex and elsewhere
574 * test it under the same mutex to ensure its correct value
577 struct attribute_group
*to_remove
= mddev
->to_remove
;
578 mddev
->to_remove
= NULL
;
579 mddev
->sysfs_active
= 1;
580 mutex_unlock(&mddev
->reconfig_mutex
);
582 if (mddev
->kobj
.sd
) {
583 if (to_remove
!= &md_redundancy_group
)
584 sysfs_remove_group(&mddev
->kobj
, to_remove
);
585 if (mddev
->pers
== NULL
||
586 mddev
->pers
->sync_request
== NULL
) {
587 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
588 if (mddev
->sysfs_action
)
589 sysfs_put(mddev
->sysfs_action
);
590 mddev
->sysfs_action
= NULL
;
593 mddev
->sysfs_active
= 0;
595 mutex_unlock(&mddev
->reconfig_mutex
);
597 md_wakeup_thread(mddev
->thread
);
600 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
604 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
605 if (rdev
->desc_nr
== nr
)
611 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
615 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
616 if (rdev
->bdev
->bd_dev
== dev
)
622 static struct mdk_personality
*find_pers(int level
, char *clevel
)
624 struct mdk_personality
*pers
;
625 list_for_each_entry(pers
, &pers_list
, list
) {
626 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
628 if (strcmp(pers
->name
, clevel
)==0)
634 /* return the offset of the super block in 512byte sectors */
635 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
637 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
638 return MD_NEW_SIZE_SECTORS(num_sectors
);
641 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
646 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
647 if (!rdev
->sb_page
) {
648 printk(KERN_ALERT
"md: out of memory.\n");
655 static void free_disk_sb(mdk_rdev_t
* rdev
)
658 put_page(rdev
->sb_page
);
660 rdev
->sb_page
= NULL
;
667 static void super_written(struct bio
*bio
, int error
)
669 mdk_rdev_t
*rdev
= bio
->bi_private
;
670 mddev_t
*mddev
= rdev
->mddev
;
672 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
673 printk("md: super_written gets error=%d, uptodate=%d\n",
674 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
675 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
676 md_error(mddev
, rdev
);
679 if (atomic_dec_and_test(&mddev
->pending_writes
))
680 wake_up(&mddev
->sb_wait
);
684 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
685 sector_t sector
, int size
, struct page
*page
)
687 /* write first size bytes of page to sector of rdev
688 * Increment mddev->pending_writes before returning
689 * and decrement it on completion, waking up sb_wait
690 * if zero is reached.
691 * If an error occurred, call md_error
693 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
695 bio
->bi_bdev
= rdev
->bdev
;
696 bio
->bi_sector
= sector
;
697 bio_add_page(bio
, page
, size
, 0);
698 bio
->bi_private
= rdev
;
699 bio
->bi_end_io
= super_written
;
701 atomic_inc(&mddev
->pending_writes
);
702 submit_bio(REQ_WRITE
| REQ_SYNC
| REQ_UNPLUG
| REQ_FLUSH
| REQ_FUA
,
706 void md_super_wait(mddev_t
*mddev
)
708 /* wait for all superblock writes that were scheduled to complete */
711 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
712 if (atomic_read(&mddev
->pending_writes
)==0)
716 finish_wait(&mddev
->sb_wait
, &wq
);
719 static void bi_complete(struct bio
*bio
, int error
)
721 complete((struct completion
*)bio
->bi_private
);
724 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
725 struct page
*page
, int rw
)
727 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
728 struct completion event
;
731 rw
|= REQ_SYNC
| REQ_UNPLUG
;
734 bio
->bi_sector
= sector
;
735 bio_add_page(bio
, page
, size
, 0);
736 init_completion(&event
);
737 bio
->bi_private
= &event
;
738 bio
->bi_end_io
= bi_complete
;
740 wait_for_completion(&event
);
742 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
746 EXPORT_SYMBOL_GPL(sync_page_io
);
748 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
750 char b
[BDEVNAME_SIZE
];
751 if (!rdev
->sb_page
) {
759 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
765 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
766 bdevname(rdev
->bdev
,b
));
770 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
772 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
773 sb1
->set_uuid1
== sb2
->set_uuid1
&&
774 sb1
->set_uuid2
== sb2
->set_uuid2
&&
775 sb1
->set_uuid3
== sb2
->set_uuid3
;
778 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
781 mdp_super_t
*tmp1
, *tmp2
;
783 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
784 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
786 if (!tmp1
|| !tmp2
) {
788 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
796 * nr_disks is not constant
801 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
809 static u32
md_csum_fold(u32 csum
)
811 csum
= (csum
& 0xffff) + (csum
>> 16);
812 return (csum
& 0xffff) + (csum
>> 16);
815 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
818 u32
*sb32
= (u32
*)sb
;
820 unsigned int disk_csum
, csum
;
822 disk_csum
= sb
->sb_csum
;
825 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
827 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
831 /* This used to use csum_partial, which was wrong for several
832 * reasons including that different results are returned on
833 * different architectures. It isn't critical that we get exactly
834 * the same return value as before (we always csum_fold before
835 * testing, and that removes any differences). However as we
836 * know that csum_partial always returned a 16bit value on
837 * alphas, do a fold to maximise conformity to previous behaviour.
839 sb
->sb_csum
= md_csum_fold(disk_csum
);
841 sb
->sb_csum
= disk_csum
;
848 * Handle superblock details.
849 * We want to be able to handle multiple superblock formats
850 * so we have a common interface to them all, and an array of
851 * different handlers.
852 * We rely on user-space to write the initial superblock, and support
853 * reading and updating of superblocks.
854 * Interface methods are:
855 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
856 * loads and validates a superblock on dev.
857 * if refdev != NULL, compare superblocks on both devices
859 * 0 - dev has a superblock that is compatible with refdev
860 * 1 - dev has a superblock that is compatible and newer than refdev
861 * so dev should be used as the refdev in future
862 * -EINVAL superblock incompatible or invalid
863 * -othererror e.g. -EIO
865 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
866 * Verify that dev is acceptable into mddev.
867 * The first time, mddev->raid_disks will be 0, and data from
868 * dev should be merged in. Subsequent calls check that dev
869 * is new enough. Return 0 or -EINVAL
871 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
872 * Update the superblock for rdev with data in mddev
873 * This does not write to disc.
879 struct module
*owner
;
880 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
882 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
883 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
884 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
885 sector_t num_sectors
);
889 * Check that the given mddev has no bitmap.
891 * This function is called from the run method of all personalities that do not
892 * support bitmaps. It prints an error message and returns non-zero if mddev
893 * has a bitmap. Otherwise, it returns 0.
896 int md_check_no_bitmap(mddev_t
*mddev
)
898 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
900 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
901 mdname(mddev
), mddev
->pers
->name
);
904 EXPORT_SYMBOL(md_check_no_bitmap
);
907 * load_super for 0.90.0
909 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
911 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
916 * Calculate the position of the superblock (512byte sectors),
917 * it's at the end of the disk.
919 * It also happens to be a multiple of 4Kb.
921 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
923 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
928 bdevname(rdev
->bdev
, b
);
929 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
931 if (sb
->md_magic
!= MD_SB_MAGIC
) {
932 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
937 if (sb
->major_version
!= 0 ||
938 sb
->minor_version
< 90 ||
939 sb
->minor_version
> 91) {
940 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
941 sb
->major_version
, sb
->minor_version
,
946 if (sb
->raid_disks
<= 0)
949 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
950 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
955 rdev
->preferred_minor
= sb
->md_minor
;
956 rdev
->data_offset
= 0;
957 rdev
->sb_size
= MD_SB_BYTES
;
959 if (sb
->level
== LEVEL_MULTIPATH
)
962 rdev
->desc_nr
= sb
->this_disk
.number
;
968 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
969 if (!uuid_equal(refsb
, sb
)) {
970 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
971 b
, bdevname(refdev
->bdev
,b2
));
974 if (!sb_equal(refsb
, sb
)) {
975 printk(KERN_WARNING
"md: %s has same UUID"
976 " but different superblock to %s\n",
977 b
, bdevname(refdev
->bdev
, b2
));
981 ev2
= md_event(refsb
);
987 rdev
->sectors
= rdev
->sb_start
;
989 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
990 /* "this cannot possibly happen" ... */
998 * validate_super for 0.90.0
1000 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1003 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1004 __u64 ev1
= md_event(sb
);
1006 rdev
->raid_disk
= -1;
1007 clear_bit(Faulty
, &rdev
->flags
);
1008 clear_bit(In_sync
, &rdev
->flags
);
1009 clear_bit(WriteMostly
, &rdev
->flags
);
1011 if (mddev
->raid_disks
== 0) {
1012 mddev
->major_version
= 0;
1013 mddev
->minor_version
= sb
->minor_version
;
1014 mddev
->patch_version
= sb
->patch_version
;
1015 mddev
->external
= 0;
1016 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1017 mddev
->ctime
= sb
->ctime
;
1018 mddev
->utime
= sb
->utime
;
1019 mddev
->level
= sb
->level
;
1020 mddev
->clevel
[0] = 0;
1021 mddev
->layout
= sb
->layout
;
1022 mddev
->raid_disks
= sb
->raid_disks
;
1023 mddev
->dev_sectors
= sb
->size
* 2;
1024 mddev
->events
= ev1
;
1025 mddev
->bitmap_info
.offset
= 0;
1026 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1028 if (mddev
->minor_version
>= 91) {
1029 mddev
->reshape_position
= sb
->reshape_position
;
1030 mddev
->delta_disks
= sb
->delta_disks
;
1031 mddev
->new_level
= sb
->new_level
;
1032 mddev
->new_layout
= sb
->new_layout
;
1033 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1035 mddev
->reshape_position
= MaxSector
;
1036 mddev
->delta_disks
= 0;
1037 mddev
->new_level
= mddev
->level
;
1038 mddev
->new_layout
= mddev
->layout
;
1039 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1042 if (sb
->state
& (1<<MD_SB_CLEAN
))
1043 mddev
->recovery_cp
= MaxSector
;
1045 if (sb
->events_hi
== sb
->cp_events_hi
&&
1046 sb
->events_lo
== sb
->cp_events_lo
) {
1047 mddev
->recovery_cp
= sb
->recovery_cp
;
1049 mddev
->recovery_cp
= 0;
1052 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1053 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1054 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1055 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1057 mddev
->max_disks
= MD_SB_DISKS
;
1059 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1060 mddev
->bitmap_info
.file
== NULL
)
1061 mddev
->bitmap_info
.offset
=
1062 mddev
->bitmap_info
.default_offset
;
1064 } else if (mddev
->pers
== NULL
) {
1065 /* Insist on good event counter while assembling, except
1066 * for spares (which don't need an event count) */
1068 if (sb
->disks
[rdev
->desc_nr
].state
& (
1069 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1070 if (ev1
< mddev
->events
)
1072 } else if (mddev
->bitmap
) {
1073 /* if adding to array with a bitmap, then we can accept an
1074 * older device ... but not too old.
1076 if (ev1
< mddev
->bitmap
->events_cleared
)
1079 if (ev1
< mddev
->events
)
1080 /* just a hot-add of a new device, leave raid_disk at -1 */
1084 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1085 desc
= sb
->disks
+ rdev
->desc_nr
;
1087 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1088 set_bit(Faulty
, &rdev
->flags
);
1089 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1090 desc->raid_disk < mddev->raid_disks */) {
1091 set_bit(In_sync
, &rdev
->flags
);
1092 rdev
->raid_disk
= desc
->raid_disk
;
1093 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1094 /* active but not in sync implies recovery up to
1095 * reshape position. We don't know exactly where
1096 * that is, so set to zero for now */
1097 if (mddev
->minor_version
>= 91) {
1098 rdev
->recovery_offset
= 0;
1099 rdev
->raid_disk
= desc
->raid_disk
;
1102 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1103 set_bit(WriteMostly
, &rdev
->flags
);
1104 } else /* MULTIPATH are always insync */
1105 set_bit(In_sync
, &rdev
->flags
);
1110 * sync_super for 0.90.0
1112 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1116 int next_spare
= mddev
->raid_disks
;
1119 /* make rdev->sb match mddev data..
1122 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1123 * 3/ any empty disks < next_spare become removed
1125 * disks[0] gets initialised to REMOVED because
1126 * we cannot be sure from other fields if it has
1127 * been initialised or not.
1130 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1132 rdev
->sb_size
= MD_SB_BYTES
;
1134 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1136 memset(sb
, 0, sizeof(*sb
));
1138 sb
->md_magic
= MD_SB_MAGIC
;
1139 sb
->major_version
= mddev
->major_version
;
1140 sb
->patch_version
= mddev
->patch_version
;
1141 sb
->gvalid_words
= 0; /* ignored */
1142 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1143 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1144 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1145 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1147 sb
->ctime
= mddev
->ctime
;
1148 sb
->level
= mddev
->level
;
1149 sb
->size
= mddev
->dev_sectors
/ 2;
1150 sb
->raid_disks
= mddev
->raid_disks
;
1151 sb
->md_minor
= mddev
->md_minor
;
1152 sb
->not_persistent
= 0;
1153 sb
->utime
= mddev
->utime
;
1155 sb
->events_hi
= (mddev
->events
>>32);
1156 sb
->events_lo
= (u32
)mddev
->events
;
1158 if (mddev
->reshape_position
== MaxSector
)
1159 sb
->minor_version
= 90;
1161 sb
->minor_version
= 91;
1162 sb
->reshape_position
= mddev
->reshape_position
;
1163 sb
->new_level
= mddev
->new_level
;
1164 sb
->delta_disks
= mddev
->delta_disks
;
1165 sb
->new_layout
= mddev
->new_layout
;
1166 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1168 mddev
->minor_version
= sb
->minor_version
;
1171 sb
->recovery_cp
= mddev
->recovery_cp
;
1172 sb
->cp_events_hi
= (mddev
->events
>>32);
1173 sb
->cp_events_lo
= (u32
)mddev
->events
;
1174 if (mddev
->recovery_cp
== MaxSector
)
1175 sb
->state
= (1<< MD_SB_CLEAN
);
1177 sb
->recovery_cp
= 0;
1179 sb
->layout
= mddev
->layout
;
1180 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1182 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1183 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1185 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1186 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1189 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1191 if (rdev2
->raid_disk
>= 0 &&
1192 sb
->minor_version
>= 91)
1193 /* we have nowhere to store the recovery_offset,
1194 * but if it is not below the reshape_position,
1195 * we can piggy-back on that.
1198 if (rdev2
->raid_disk
< 0 ||
1199 test_bit(Faulty
, &rdev2
->flags
))
1202 desc_nr
= rdev2
->raid_disk
;
1204 desc_nr
= next_spare
++;
1205 rdev2
->desc_nr
= desc_nr
;
1206 d
= &sb
->disks
[rdev2
->desc_nr
];
1208 d
->number
= rdev2
->desc_nr
;
1209 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1210 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1212 d
->raid_disk
= rdev2
->raid_disk
;
1214 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1215 if (test_bit(Faulty
, &rdev2
->flags
))
1216 d
->state
= (1<<MD_DISK_FAULTY
);
1217 else if (is_active
) {
1218 d
->state
= (1<<MD_DISK_ACTIVE
);
1219 if (test_bit(In_sync
, &rdev2
->flags
))
1220 d
->state
|= (1<<MD_DISK_SYNC
);
1228 if (test_bit(WriteMostly
, &rdev2
->flags
))
1229 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1231 /* now set the "removed" and "faulty" bits on any missing devices */
1232 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1233 mdp_disk_t
*d
= &sb
->disks
[i
];
1234 if (d
->state
== 0 && d
->number
== 0) {
1237 d
->state
= (1<<MD_DISK_REMOVED
);
1238 d
->state
|= (1<<MD_DISK_FAULTY
);
1242 sb
->nr_disks
= nr_disks
;
1243 sb
->active_disks
= active
;
1244 sb
->working_disks
= working
;
1245 sb
->failed_disks
= failed
;
1246 sb
->spare_disks
= spare
;
1248 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1249 sb
->sb_csum
= calc_sb_csum(sb
);
1253 * rdev_size_change for 0.90.0
1255 static unsigned long long
1256 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1258 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1259 return 0; /* component must fit device */
1260 if (rdev
->mddev
->bitmap_info
.offset
)
1261 return 0; /* can't move bitmap */
1262 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1263 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1264 num_sectors
= rdev
->sb_start
;
1265 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1267 md_super_wait(rdev
->mddev
);
1268 return num_sectors
/ 2; /* kB for sysfs */
1273 * version 1 superblock
1276 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1280 unsigned long long newcsum
;
1281 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1282 __le32
*isuper
= (__le32
*)sb
;
1285 disk_csum
= sb
->sb_csum
;
1288 for (i
=0; size
>=4; size
-= 4 )
1289 newcsum
+= le32_to_cpu(*isuper
++);
1292 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1294 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1295 sb
->sb_csum
= disk_csum
;
1296 return cpu_to_le32(csum
);
1299 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1301 struct mdp_superblock_1
*sb
;
1304 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1308 * Calculate the position of the superblock in 512byte sectors.
1309 * It is always aligned to a 4K boundary and
1310 * depeding on minor_version, it can be:
1311 * 0: At least 8K, but less than 12K, from end of device
1312 * 1: At start of device
1313 * 2: 4K from start of device.
1315 switch(minor_version
) {
1317 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1319 sb_start
&= ~(sector_t
)(4*2-1);
1330 rdev
->sb_start
= sb_start
;
1332 /* superblock is rarely larger than 1K, but it can be larger,
1333 * and it is safe to read 4k, so we do that
1335 ret
= read_disk_sb(rdev
, 4096);
1336 if (ret
) return ret
;
1339 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1341 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1342 sb
->major_version
!= cpu_to_le32(1) ||
1343 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1344 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1345 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1348 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1349 printk("md: invalid superblock checksum on %s\n",
1350 bdevname(rdev
->bdev
,b
));
1353 if (le64_to_cpu(sb
->data_size
) < 10) {
1354 printk("md: data_size too small on %s\n",
1355 bdevname(rdev
->bdev
,b
));
1359 rdev
->preferred_minor
= 0xffff;
1360 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1361 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1363 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1364 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1365 if (rdev
->sb_size
& bmask
)
1366 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1369 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1372 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1375 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1381 struct mdp_superblock_1
*refsb
=
1382 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1384 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1385 sb
->level
!= refsb
->level
||
1386 sb
->layout
!= refsb
->layout
||
1387 sb
->chunksize
!= refsb
->chunksize
) {
1388 printk(KERN_WARNING
"md: %s has strangely different"
1389 " superblock to %s\n",
1390 bdevname(rdev
->bdev
,b
),
1391 bdevname(refdev
->bdev
,b2
));
1394 ev1
= le64_to_cpu(sb
->events
);
1395 ev2
= le64_to_cpu(refsb
->events
);
1403 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1404 le64_to_cpu(sb
->data_offset
);
1406 rdev
->sectors
= rdev
->sb_start
;
1407 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1409 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1410 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1415 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1417 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1418 __u64 ev1
= le64_to_cpu(sb
->events
);
1420 rdev
->raid_disk
= -1;
1421 clear_bit(Faulty
, &rdev
->flags
);
1422 clear_bit(In_sync
, &rdev
->flags
);
1423 clear_bit(WriteMostly
, &rdev
->flags
);
1425 if (mddev
->raid_disks
== 0) {
1426 mddev
->major_version
= 1;
1427 mddev
->patch_version
= 0;
1428 mddev
->external
= 0;
1429 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1430 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1431 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1432 mddev
->level
= le32_to_cpu(sb
->level
);
1433 mddev
->clevel
[0] = 0;
1434 mddev
->layout
= le32_to_cpu(sb
->layout
);
1435 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1436 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1437 mddev
->events
= ev1
;
1438 mddev
->bitmap_info
.offset
= 0;
1439 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1441 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1442 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1444 mddev
->max_disks
= (4096-256)/2;
1446 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1447 mddev
->bitmap_info
.file
== NULL
)
1448 mddev
->bitmap_info
.offset
=
1449 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1451 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1452 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1453 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1454 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1455 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1456 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1458 mddev
->reshape_position
= MaxSector
;
1459 mddev
->delta_disks
= 0;
1460 mddev
->new_level
= mddev
->level
;
1461 mddev
->new_layout
= mddev
->layout
;
1462 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1465 } else if (mddev
->pers
== NULL
) {
1466 /* Insist of good event counter while assembling, except for
1467 * spares (which don't need an event count) */
1469 if (rdev
->desc_nr
>= 0 &&
1470 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1471 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1472 if (ev1
< mddev
->events
)
1474 } else if (mddev
->bitmap
) {
1475 /* If adding to array with a bitmap, then we can accept an
1476 * older device, but not too old.
1478 if (ev1
< mddev
->bitmap
->events_cleared
)
1481 if (ev1
< mddev
->events
)
1482 /* just a hot-add of a new device, leave raid_disk at -1 */
1485 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1487 if (rdev
->desc_nr
< 0 ||
1488 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1492 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1494 case 0xffff: /* spare */
1496 case 0xfffe: /* faulty */
1497 set_bit(Faulty
, &rdev
->flags
);
1500 if ((le32_to_cpu(sb
->feature_map
) &
1501 MD_FEATURE_RECOVERY_OFFSET
))
1502 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1504 set_bit(In_sync
, &rdev
->flags
);
1505 rdev
->raid_disk
= role
;
1508 if (sb
->devflags
& WriteMostly1
)
1509 set_bit(WriteMostly
, &rdev
->flags
);
1510 } else /* MULTIPATH are always insync */
1511 set_bit(In_sync
, &rdev
->flags
);
1516 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1518 struct mdp_superblock_1
*sb
;
1521 /* make rdev->sb match mddev and rdev data. */
1523 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1525 sb
->feature_map
= 0;
1527 sb
->recovery_offset
= cpu_to_le64(0);
1528 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1529 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1530 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1532 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1533 sb
->events
= cpu_to_le64(mddev
->events
);
1535 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1537 sb
->resync_offset
= cpu_to_le64(0);
1539 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1541 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1542 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1543 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1544 sb
->level
= cpu_to_le32(mddev
->level
);
1545 sb
->layout
= cpu_to_le32(mddev
->layout
);
1547 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1548 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1549 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1552 if (rdev
->raid_disk
>= 0 &&
1553 !test_bit(In_sync
, &rdev
->flags
)) {
1555 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1556 sb
->recovery_offset
=
1557 cpu_to_le64(rdev
->recovery_offset
);
1560 if (mddev
->reshape_position
!= MaxSector
) {
1561 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1562 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1563 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1564 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1565 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1566 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1570 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1571 if (rdev2
->desc_nr
+1 > max_dev
)
1572 max_dev
= rdev2
->desc_nr
+1;
1574 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1576 sb
->max_dev
= cpu_to_le32(max_dev
);
1577 rdev
->sb_size
= max_dev
* 2 + 256;
1578 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1579 if (rdev
->sb_size
& bmask
)
1580 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1582 max_dev
= le32_to_cpu(sb
->max_dev
);
1584 for (i
=0; i
<max_dev
;i
++)
1585 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1587 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1589 if (test_bit(Faulty
, &rdev2
->flags
))
1590 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1591 else if (test_bit(In_sync
, &rdev2
->flags
))
1592 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1593 else if (rdev2
->raid_disk
>= 0)
1594 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1596 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1599 sb
->sb_csum
= calc_sb_1_csum(sb
);
1602 static unsigned long long
1603 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1605 struct mdp_superblock_1
*sb
;
1606 sector_t max_sectors
;
1607 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1608 return 0; /* component must fit device */
1609 if (rdev
->sb_start
< rdev
->data_offset
) {
1610 /* minor versions 1 and 2; superblock before data */
1611 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1612 max_sectors
-= rdev
->data_offset
;
1613 if (!num_sectors
|| num_sectors
> max_sectors
)
1614 num_sectors
= max_sectors
;
1615 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1616 /* minor version 0 with bitmap we can't move */
1619 /* minor version 0; superblock after data */
1621 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1622 sb_start
&= ~(sector_t
)(4*2 - 1);
1623 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1624 if (!num_sectors
|| num_sectors
> max_sectors
)
1625 num_sectors
= max_sectors
;
1626 rdev
->sb_start
= sb_start
;
1628 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1629 sb
->data_size
= cpu_to_le64(num_sectors
);
1630 sb
->super_offset
= rdev
->sb_start
;
1631 sb
->sb_csum
= calc_sb_1_csum(sb
);
1632 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1634 md_super_wait(rdev
->mddev
);
1635 return num_sectors
/ 2; /* kB for sysfs */
1638 static struct super_type super_types
[] = {
1641 .owner
= THIS_MODULE
,
1642 .load_super
= super_90_load
,
1643 .validate_super
= super_90_validate
,
1644 .sync_super
= super_90_sync
,
1645 .rdev_size_change
= super_90_rdev_size_change
,
1649 .owner
= THIS_MODULE
,
1650 .load_super
= super_1_load
,
1651 .validate_super
= super_1_validate
,
1652 .sync_super
= super_1_sync
,
1653 .rdev_size_change
= super_1_rdev_size_change
,
1657 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1659 mdk_rdev_t
*rdev
, *rdev2
;
1662 rdev_for_each_rcu(rdev
, mddev1
)
1663 rdev_for_each_rcu(rdev2
, mddev2
)
1664 if (rdev
->bdev
->bd_contains
==
1665 rdev2
->bdev
->bd_contains
) {
1673 static LIST_HEAD(pending_raid_disks
);
1676 * Try to register data integrity profile for an mddev
1678 * This is called when an array is started and after a disk has been kicked
1679 * from the array. It only succeeds if all working and active component devices
1680 * are integrity capable with matching profiles.
1682 int md_integrity_register(mddev_t
*mddev
)
1684 mdk_rdev_t
*rdev
, *reference
= NULL
;
1686 if (list_empty(&mddev
->disks
))
1687 return 0; /* nothing to do */
1688 if (blk_get_integrity(mddev
->gendisk
))
1689 return 0; /* already registered */
1690 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1691 /* skip spares and non-functional disks */
1692 if (test_bit(Faulty
, &rdev
->flags
))
1694 if (rdev
->raid_disk
< 0)
1697 * If at least one rdev is not integrity capable, we can not
1698 * enable data integrity for the md device.
1700 if (!bdev_get_integrity(rdev
->bdev
))
1703 /* Use the first rdev as the reference */
1707 /* does this rdev's profile match the reference profile? */
1708 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1709 rdev
->bdev
->bd_disk
) < 0)
1713 * All component devices are integrity capable and have matching
1714 * profiles, register the common profile for the md device.
1716 if (blk_integrity_register(mddev
->gendisk
,
1717 bdev_get_integrity(reference
->bdev
)) != 0) {
1718 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1722 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1726 EXPORT_SYMBOL(md_integrity_register
);
1728 /* Disable data integrity if non-capable/non-matching disk is being added */
1729 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1731 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1732 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1734 if (!bi_mddev
) /* nothing to do */
1736 if (rdev
->raid_disk
< 0) /* skip spares */
1738 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1739 rdev
->bdev
->bd_disk
) >= 0)
1741 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1742 blk_integrity_unregister(mddev
->gendisk
);
1744 EXPORT_SYMBOL(md_integrity_add_rdev
);
1746 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1748 char b
[BDEVNAME_SIZE
];
1758 /* prevent duplicates */
1759 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1762 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1763 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1764 rdev
->sectors
< mddev
->dev_sectors
)) {
1766 /* Cannot change size, so fail
1767 * If mddev->level <= 0, then we don't care
1768 * about aligning sizes (e.g. linear)
1770 if (mddev
->level
> 0)
1773 mddev
->dev_sectors
= rdev
->sectors
;
1776 /* Verify rdev->desc_nr is unique.
1777 * If it is -1, assign a free number, else
1778 * check number is not in use
1780 if (rdev
->desc_nr
< 0) {
1782 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1783 while (find_rdev_nr(mddev
, choice
))
1785 rdev
->desc_nr
= choice
;
1787 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1790 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1791 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1792 mdname(mddev
), mddev
->max_disks
);
1795 bdevname(rdev
->bdev
,b
);
1796 while ( (s
=strchr(b
, '/')) != NULL
)
1799 rdev
->mddev
= mddev
;
1800 printk(KERN_INFO
"md: bind<%s>\n", b
);
1802 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1805 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1806 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1807 /* failure here is OK */;
1808 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1810 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1811 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1813 /* May as well allow recovery to be retried once */
1814 mddev
->recovery_disabled
= 0;
1819 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1824 static void md_delayed_delete(struct work_struct
*ws
)
1826 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1827 kobject_del(&rdev
->kobj
);
1828 kobject_put(&rdev
->kobj
);
1831 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1833 char b
[BDEVNAME_SIZE
];
1838 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1839 list_del_rcu(&rdev
->same_set
);
1840 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1842 sysfs_remove_link(&rdev
->kobj
, "block");
1843 sysfs_put(rdev
->sysfs_state
);
1844 rdev
->sysfs_state
= NULL
;
1845 /* We need to delay this, otherwise we can deadlock when
1846 * writing to 'remove' to "dev/state". We also need
1847 * to delay it due to rcu usage.
1850 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1851 kobject_get(&rdev
->kobj
);
1852 schedule_work(&rdev
->del_work
);
1856 * prevent the device from being mounted, repartitioned or
1857 * otherwise reused by a RAID array (or any other kernel
1858 * subsystem), by bd_claiming the device.
1860 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1863 struct block_device
*bdev
;
1864 char b
[BDEVNAME_SIZE
];
1866 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1868 printk(KERN_ERR
"md: could not open %s.\n",
1869 __bdevname(dev
, b
));
1870 return PTR_ERR(bdev
);
1872 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1874 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1876 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1880 set_bit(AllReserved
, &rdev
->flags
);
1885 static void unlock_rdev(mdk_rdev_t
*rdev
)
1887 struct block_device
*bdev
= rdev
->bdev
;
1892 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1895 void md_autodetect_dev(dev_t dev
);
1897 static void export_rdev(mdk_rdev_t
* rdev
)
1899 char b
[BDEVNAME_SIZE
];
1900 printk(KERN_INFO
"md: export_rdev(%s)\n",
1901 bdevname(rdev
->bdev
,b
));
1906 if (test_bit(AutoDetected
, &rdev
->flags
))
1907 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1910 kobject_put(&rdev
->kobj
);
1913 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1915 unbind_rdev_from_array(rdev
);
1919 static void export_array(mddev_t
*mddev
)
1921 mdk_rdev_t
*rdev
, *tmp
;
1923 rdev_for_each(rdev
, tmp
, mddev
) {
1928 kick_rdev_from_array(rdev
);
1930 if (!list_empty(&mddev
->disks
))
1932 mddev
->raid_disks
= 0;
1933 mddev
->major_version
= 0;
1936 static void print_desc(mdp_disk_t
*desc
)
1938 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1939 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1942 static void print_sb_90(mdp_super_t
*sb
)
1947 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1948 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1949 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1951 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1952 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1953 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1954 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1955 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1956 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1957 sb
->failed_disks
, sb
->spare_disks
,
1958 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1961 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1964 desc
= sb
->disks
+ i
;
1965 if (desc
->number
|| desc
->major
|| desc
->minor
||
1966 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1967 printk(" D %2d: ", i
);
1971 printk(KERN_INFO
"md: THIS: ");
1972 print_desc(&sb
->this_disk
);
1975 static void print_sb_1(struct mdp_superblock_1
*sb
)
1979 uuid
= sb
->set_uuid
;
1981 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
1982 "md: Name: \"%s\" CT:%llu\n",
1983 le32_to_cpu(sb
->major_version
),
1984 le32_to_cpu(sb
->feature_map
),
1987 (unsigned long long)le64_to_cpu(sb
->ctime
)
1988 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1990 uuid
= sb
->device_uuid
;
1992 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1994 "md: Dev:%08x UUID: %pU\n"
1995 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1996 "md: (MaxDev:%u) \n",
1997 le32_to_cpu(sb
->level
),
1998 (unsigned long long)le64_to_cpu(sb
->size
),
1999 le32_to_cpu(sb
->raid_disks
),
2000 le32_to_cpu(sb
->layout
),
2001 le32_to_cpu(sb
->chunksize
),
2002 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2003 (unsigned long long)le64_to_cpu(sb
->data_size
),
2004 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2005 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2006 le32_to_cpu(sb
->dev_number
),
2009 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2010 (unsigned long long)le64_to_cpu(sb
->events
),
2011 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2012 le32_to_cpu(sb
->sb_csum
),
2013 le32_to_cpu(sb
->max_dev
)
2017 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2019 char b
[BDEVNAME_SIZE
];
2020 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2021 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2022 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2024 if (rdev
->sb_loaded
) {
2025 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2026 switch (major_version
) {
2028 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2031 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2035 printk(KERN_INFO
"md: no rdev superblock!\n");
2038 static void md_print_devices(void)
2040 struct list_head
*tmp
;
2043 char b
[BDEVNAME_SIZE
];
2046 printk("md: **********************************\n");
2047 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2048 printk("md: **********************************\n");
2049 for_each_mddev(mddev
, tmp
) {
2052 bitmap_print_sb(mddev
->bitmap
);
2054 printk("%s: ", mdname(mddev
));
2055 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2056 printk("<%s>", bdevname(rdev
->bdev
,b
));
2059 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2060 print_rdev(rdev
, mddev
->major_version
);
2062 printk("md: **********************************\n");
2067 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2069 /* Update each superblock (in-memory image), but
2070 * if we are allowed to, skip spares which already
2071 * have the right event counter, or have one earlier
2072 * (which would mean they aren't being marked as dirty
2073 * with the rest of the array)
2076 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2077 if (rdev
->sb_events
== mddev
->events
||
2079 rdev
->raid_disk
< 0 &&
2080 rdev
->sb_events
+1 == mddev
->events
)) {
2081 /* Don't update this superblock */
2082 rdev
->sb_loaded
= 2;
2084 super_types
[mddev
->major_version
].
2085 sync_super(mddev
, rdev
);
2086 rdev
->sb_loaded
= 1;
2091 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2098 /* First make sure individual recovery_offsets are correct */
2099 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2100 if (rdev
->raid_disk
>= 0 &&
2101 mddev
->delta_disks
>= 0 &&
2102 !test_bit(In_sync
, &rdev
->flags
) &&
2103 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2104 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2107 if (!mddev
->persistent
) {
2108 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2109 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2110 wake_up(&mddev
->sb_wait
);
2114 spin_lock_irq(&mddev
->write_lock
);
2116 mddev
->utime
= get_seconds();
2118 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2120 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2121 /* just a clean<-> dirty transition, possibly leave spares alone,
2122 * though if events isn't the right even/odd, we will have to do
2128 if (mddev
->degraded
)
2129 /* If the array is degraded, then skipping spares is both
2130 * dangerous and fairly pointless.
2131 * Dangerous because a device that was removed from the array
2132 * might have a event_count that still looks up-to-date,
2133 * so it can be re-added without a resync.
2134 * Pointless because if there are any spares to skip,
2135 * then a recovery will happen and soon that array won't
2136 * be degraded any more and the spare can go back to sleep then.
2140 sync_req
= mddev
->in_sync
;
2142 /* If this is just a dirty<->clean transition, and the array is clean
2143 * and 'events' is odd, we can roll back to the previous clean state */
2145 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2146 && mddev
->can_decrease_events
2147 && mddev
->events
!= 1) {
2149 mddev
->can_decrease_events
= 0;
2151 /* otherwise we have to go forward and ... */
2153 mddev
->can_decrease_events
= nospares
;
2156 if (!mddev
->events
) {
2158 * oops, this 64-bit counter should never wrap.
2159 * Either we are in around ~1 trillion A.C., assuming
2160 * 1 reboot per second, or we have a bug:
2165 sync_sbs(mddev
, nospares
);
2166 spin_unlock_irq(&mddev
->write_lock
);
2169 "md: updating %s RAID superblock on device (in sync %d)\n",
2170 mdname(mddev
),mddev
->in_sync
);
2172 bitmap_update_sb(mddev
->bitmap
);
2173 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2174 char b
[BDEVNAME_SIZE
];
2175 dprintk(KERN_INFO
"md: ");
2176 if (rdev
->sb_loaded
!= 1)
2177 continue; /* no noise on spare devices */
2178 if (test_bit(Faulty
, &rdev
->flags
))
2179 dprintk("(skipping faulty ");
2181 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2182 if (!test_bit(Faulty
, &rdev
->flags
)) {
2183 md_super_write(mddev
,rdev
,
2184 rdev
->sb_start
, rdev
->sb_size
,
2186 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2187 bdevname(rdev
->bdev
,b
),
2188 (unsigned long long)rdev
->sb_start
);
2189 rdev
->sb_events
= mddev
->events
;
2193 if (mddev
->level
== LEVEL_MULTIPATH
)
2194 /* only need to write one superblock... */
2197 md_super_wait(mddev
);
2198 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2200 spin_lock_irq(&mddev
->write_lock
);
2201 if (mddev
->in_sync
!= sync_req
||
2202 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2203 /* have to write it out again */
2204 spin_unlock_irq(&mddev
->write_lock
);
2207 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2208 spin_unlock_irq(&mddev
->write_lock
);
2209 wake_up(&mddev
->sb_wait
);
2210 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2211 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2215 /* words written to sysfs files may, or may not, be \n terminated.
2216 * We want to accept with case. For this we use cmd_match.
2218 static int cmd_match(const char *cmd
, const char *str
)
2220 /* See if cmd, written into a sysfs file, matches
2221 * str. They must either be the same, or cmd can
2222 * have a trailing newline
2224 while (*cmd
&& *str
&& *cmd
== *str
) {
2235 struct rdev_sysfs_entry
{
2236 struct attribute attr
;
2237 ssize_t (*show
)(mdk_rdev_t
*, char *);
2238 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2242 state_show(mdk_rdev_t
*rdev
, char *page
)
2247 if (test_bit(Faulty
, &rdev
->flags
)) {
2248 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2251 if (test_bit(In_sync
, &rdev
->flags
)) {
2252 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2255 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2256 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2259 if (test_bit(Blocked
, &rdev
->flags
)) {
2260 len
+= sprintf(page
+len
, "%sblocked", sep
);
2263 if (!test_bit(Faulty
, &rdev
->flags
) &&
2264 !test_bit(In_sync
, &rdev
->flags
)) {
2265 len
+= sprintf(page
+len
, "%sspare", sep
);
2268 return len
+sprintf(page
+len
, "\n");
2272 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2275 * faulty - simulates and error
2276 * remove - disconnects the device
2277 * writemostly - sets write_mostly
2278 * -writemostly - clears write_mostly
2279 * blocked - sets the Blocked flag
2280 * -blocked - clears the Blocked flag
2281 * insync - sets Insync providing device isn't active
2284 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2285 md_error(rdev
->mddev
, rdev
);
2287 } else if (cmd_match(buf
, "remove")) {
2288 if (rdev
->raid_disk
>= 0)
2291 mddev_t
*mddev
= rdev
->mddev
;
2292 kick_rdev_from_array(rdev
);
2294 md_update_sb(mddev
, 1);
2295 md_new_event(mddev
);
2298 } else if (cmd_match(buf
, "writemostly")) {
2299 set_bit(WriteMostly
, &rdev
->flags
);
2301 } else if (cmd_match(buf
, "-writemostly")) {
2302 clear_bit(WriteMostly
, &rdev
->flags
);
2304 } else if (cmd_match(buf
, "blocked")) {
2305 set_bit(Blocked
, &rdev
->flags
);
2307 } else if (cmd_match(buf
, "-blocked")) {
2308 clear_bit(Blocked
, &rdev
->flags
);
2309 wake_up(&rdev
->blocked_wait
);
2310 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2311 md_wakeup_thread(rdev
->mddev
->thread
);
2314 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2315 set_bit(In_sync
, &rdev
->flags
);
2319 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2320 return err
? err
: len
;
2322 static struct rdev_sysfs_entry rdev_state
=
2323 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2326 errors_show(mdk_rdev_t
*rdev
, char *page
)
2328 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2332 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2335 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2336 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2337 atomic_set(&rdev
->corrected_errors
, n
);
2342 static struct rdev_sysfs_entry rdev_errors
=
2343 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2346 slot_show(mdk_rdev_t
*rdev
, char *page
)
2348 if (rdev
->raid_disk
< 0)
2349 return sprintf(page
, "none\n");
2351 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2355 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2360 int slot
= simple_strtoul(buf
, &e
, 10);
2361 if (strncmp(buf
, "none", 4)==0)
2363 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2365 if (rdev
->mddev
->pers
&& slot
== -1) {
2366 /* Setting 'slot' on an active array requires also
2367 * updating the 'rd%d' link, and communicating
2368 * with the personality with ->hot_*_disk.
2369 * For now we only support removing
2370 * failed/spare devices. This normally happens automatically,
2371 * but not when the metadata is externally managed.
2373 if (rdev
->raid_disk
== -1)
2375 /* personality does all needed checks */
2376 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2378 err
= rdev
->mddev
->pers
->
2379 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2382 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2383 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2384 rdev
->raid_disk
= -1;
2385 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2386 md_wakeup_thread(rdev
->mddev
->thread
);
2387 } else if (rdev
->mddev
->pers
) {
2389 /* Activating a spare .. or possibly reactivating
2390 * if we ever get bitmaps working here.
2393 if (rdev
->raid_disk
!= -1)
2396 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2399 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2400 if (rdev2
->raid_disk
== slot
)
2403 rdev
->raid_disk
= slot
;
2404 if (test_bit(In_sync
, &rdev
->flags
))
2405 rdev
->saved_raid_disk
= slot
;
2407 rdev
->saved_raid_disk
= -1;
2408 err
= rdev
->mddev
->pers
->
2409 hot_add_disk(rdev
->mddev
, rdev
);
2411 rdev
->raid_disk
= -1;
2414 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2415 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2416 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2417 /* failure here is OK */;
2418 /* don't wakeup anyone, leave that to userspace. */
2420 if (slot
>= rdev
->mddev
->raid_disks
)
2422 rdev
->raid_disk
= slot
;
2423 /* assume it is working */
2424 clear_bit(Faulty
, &rdev
->flags
);
2425 clear_bit(WriteMostly
, &rdev
->flags
);
2426 set_bit(In_sync
, &rdev
->flags
);
2427 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2433 static struct rdev_sysfs_entry rdev_slot
=
2434 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2437 offset_show(mdk_rdev_t
*rdev
, char *page
)
2439 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2443 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2446 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2447 if (e
==buf
|| (*e
&& *e
!= '\n'))
2449 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2451 if (rdev
->sectors
&& rdev
->mddev
->external
)
2452 /* Must set offset before size, so overlap checks
2455 rdev
->data_offset
= offset
;
2459 static struct rdev_sysfs_entry rdev_offset
=
2460 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2463 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2465 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2468 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2470 /* check if two start/length pairs overlap */
2478 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2480 unsigned long long blocks
;
2483 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2486 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2487 return -EINVAL
; /* sector conversion overflow */
2490 if (new != blocks
* 2)
2491 return -EINVAL
; /* unsigned long long to sector_t overflow */
2498 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2500 mddev_t
*my_mddev
= rdev
->mddev
;
2501 sector_t oldsectors
= rdev
->sectors
;
2504 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2506 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2507 if (my_mddev
->persistent
) {
2508 sectors
= super_types
[my_mddev
->major_version
].
2509 rdev_size_change(rdev
, sectors
);
2512 } else if (!sectors
)
2513 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2516 if (sectors
< my_mddev
->dev_sectors
)
2517 return -EINVAL
; /* component must fit device */
2519 rdev
->sectors
= sectors
;
2520 if (sectors
> oldsectors
&& my_mddev
->external
) {
2521 /* need to check that all other rdevs with the same ->bdev
2522 * do not overlap. We need to unlock the mddev to avoid
2523 * a deadlock. We have already changed rdev->sectors, and if
2524 * we have to change it back, we will have the lock again.
2528 struct list_head
*tmp
;
2530 mddev_unlock(my_mddev
);
2531 for_each_mddev(mddev
, tmp
) {
2535 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2536 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2537 (rdev
->bdev
== rdev2
->bdev
&&
2539 overlaps(rdev
->data_offset
, rdev
->sectors
,
2545 mddev_unlock(mddev
);
2551 mddev_lock(my_mddev
);
2553 /* Someone else could have slipped in a size
2554 * change here, but doing so is just silly.
2555 * We put oldsectors back because we *know* it is
2556 * safe, and trust userspace not to race with
2559 rdev
->sectors
= oldsectors
;
2566 static struct rdev_sysfs_entry rdev_size
=
2567 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2570 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2572 unsigned long long recovery_start
= rdev
->recovery_offset
;
2574 if (test_bit(In_sync
, &rdev
->flags
) ||
2575 recovery_start
== MaxSector
)
2576 return sprintf(page
, "none\n");
2578 return sprintf(page
, "%llu\n", recovery_start
);
2581 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2583 unsigned long long recovery_start
;
2585 if (cmd_match(buf
, "none"))
2586 recovery_start
= MaxSector
;
2587 else if (strict_strtoull(buf
, 10, &recovery_start
))
2590 if (rdev
->mddev
->pers
&&
2591 rdev
->raid_disk
>= 0)
2594 rdev
->recovery_offset
= recovery_start
;
2595 if (recovery_start
== MaxSector
)
2596 set_bit(In_sync
, &rdev
->flags
);
2598 clear_bit(In_sync
, &rdev
->flags
);
2602 static struct rdev_sysfs_entry rdev_recovery_start
=
2603 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2605 static struct attribute
*rdev_default_attrs
[] = {
2611 &rdev_recovery_start
.attr
,
2615 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2617 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2618 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2619 mddev_t
*mddev
= rdev
->mddev
;
2625 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2627 if (rdev
->mddev
== NULL
)
2630 rv
= entry
->show(rdev
, page
);
2631 mddev_unlock(mddev
);
2637 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2638 const char *page
, size_t length
)
2640 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2641 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2643 mddev_t
*mddev
= rdev
->mddev
;
2647 if (!capable(CAP_SYS_ADMIN
))
2649 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2651 if (rdev
->mddev
== NULL
)
2654 rv
= entry
->store(rdev
, page
, length
);
2655 mddev_unlock(mddev
);
2660 static void rdev_free(struct kobject
*ko
)
2662 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2665 static const struct sysfs_ops rdev_sysfs_ops
= {
2666 .show
= rdev_attr_show
,
2667 .store
= rdev_attr_store
,
2669 static struct kobj_type rdev_ktype
= {
2670 .release
= rdev_free
,
2671 .sysfs_ops
= &rdev_sysfs_ops
,
2672 .default_attrs
= rdev_default_attrs
,
2675 void md_rdev_init(mdk_rdev_t
*rdev
)
2678 rdev
->saved_raid_disk
= -1;
2679 rdev
->raid_disk
= -1;
2681 rdev
->data_offset
= 0;
2682 rdev
->sb_events
= 0;
2683 rdev
->last_read_error
.tv_sec
= 0;
2684 rdev
->last_read_error
.tv_nsec
= 0;
2685 atomic_set(&rdev
->nr_pending
, 0);
2686 atomic_set(&rdev
->read_errors
, 0);
2687 atomic_set(&rdev
->corrected_errors
, 0);
2689 INIT_LIST_HEAD(&rdev
->same_set
);
2690 init_waitqueue_head(&rdev
->blocked_wait
);
2692 EXPORT_SYMBOL_GPL(md_rdev_init
);
2694 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2696 * mark the device faulty if:
2698 * - the device is nonexistent (zero size)
2699 * - the device has no valid superblock
2701 * a faulty rdev _never_ has rdev->sb set.
2703 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2705 char b
[BDEVNAME_SIZE
];
2710 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2712 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2713 return ERR_PTR(-ENOMEM
);
2717 if ((err
= alloc_disk_sb(rdev
)))
2720 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2724 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2726 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2729 "md: %s has zero or unknown size, marking faulty!\n",
2730 bdevname(rdev
->bdev
,b
));
2735 if (super_format
>= 0) {
2736 err
= super_types
[super_format
].
2737 load_super(rdev
, NULL
, super_minor
);
2738 if (err
== -EINVAL
) {
2740 "md: %s does not have a valid v%d.%d "
2741 "superblock, not importing!\n",
2742 bdevname(rdev
->bdev
,b
),
2743 super_format
, super_minor
);
2748 "md: could not read %s's sb, not importing!\n",
2749 bdevname(rdev
->bdev
,b
));
2757 if (rdev
->sb_page
) {
2763 return ERR_PTR(err
);
2767 * Check a full RAID array for plausibility
2771 static void analyze_sbs(mddev_t
* mddev
)
2774 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2775 char b
[BDEVNAME_SIZE
];
2778 rdev_for_each(rdev
, tmp
, mddev
)
2779 switch (super_types
[mddev
->major_version
].
2780 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2788 "md: fatal superblock inconsistency in %s"
2789 " -- removing from array\n",
2790 bdevname(rdev
->bdev
,b
));
2791 kick_rdev_from_array(rdev
);
2795 super_types
[mddev
->major_version
].
2796 validate_super(mddev
, freshest
);
2799 rdev_for_each(rdev
, tmp
, mddev
) {
2800 if (mddev
->max_disks
&&
2801 (rdev
->desc_nr
>= mddev
->max_disks
||
2802 i
> mddev
->max_disks
)) {
2804 "md: %s: %s: only %d devices permitted\n",
2805 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2807 kick_rdev_from_array(rdev
);
2810 if (rdev
!= freshest
)
2811 if (super_types
[mddev
->major_version
].
2812 validate_super(mddev
, rdev
)) {
2813 printk(KERN_WARNING
"md: kicking non-fresh %s"
2815 bdevname(rdev
->bdev
,b
));
2816 kick_rdev_from_array(rdev
);
2819 if (mddev
->level
== LEVEL_MULTIPATH
) {
2820 rdev
->desc_nr
= i
++;
2821 rdev
->raid_disk
= rdev
->desc_nr
;
2822 set_bit(In_sync
, &rdev
->flags
);
2823 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2824 rdev
->raid_disk
= -1;
2825 clear_bit(In_sync
, &rdev
->flags
);
2830 /* Read a fixed-point number.
2831 * Numbers in sysfs attributes should be in "standard" units where
2832 * possible, so time should be in seconds.
2833 * However we internally use a a much smaller unit such as
2834 * milliseconds or jiffies.
2835 * This function takes a decimal number with a possible fractional
2836 * component, and produces an integer which is the result of
2837 * multiplying that number by 10^'scale'.
2838 * all without any floating-point arithmetic.
2840 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2842 unsigned long result
= 0;
2844 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2847 else if (decimals
< scale
) {
2850 result
= result
* 10 + value
;
2862 while (decimals
< scale
) {
2871 static void md_safemode_timeout(unsigned long data
);
2874 safe_delay_show(mddev_t
*mddev
, char *page
)
2876 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2877 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2880 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2884 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2887 mddev
->safemode_delay
= 0;
2889 unsigned long old_delay
= mddev
->safemode_delay
;
2890 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2891 if (mddev
->safemode_delay
== 0)
2892 mddev
->safemode_delay
= 1;
2893 if (mddev
->safemode_delay
< old_delay
)
2894 md_safemode_timeout((unsigned long)mddev
);
2898 static struct md_sysfs_entry md_safe_delay
=
2899 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2902 level_show(mddev_t
*mddev
, char *page
)
2904 struct mdk_personality
*p
= mddev
->pers
;
2906 return sprintf(page
, "%s\n", p
->name
);
2907 else if (mddev
->clevel
[0])
2908 return sprintf(page
, "%s\n", mddev
->clevel
);
2909 else if (mddev
->level
!= LEVEL_NONE
)
2910 return sprintf(page
, "%d\n", mddev
->level
);
2916 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2920 struct mdk_personality
*pers
;
2925 if (mddev
->pers
== NULL
) {
2928 if (len
>= sizeof(mddev
->clevel
))
2930 strncpy(mddev
->clevel
, buf
, len
);
2931 if (mddev
->clevel
[len
-1] == '\n')
2933 mddev
->clevel
[len
] = 0;
2934 mddev
->level
= LEVEL_NONE
;
2938 /* request to change the personality. Need to ensure:
2939 * - array is not engaged in resync/recovery/reshape
2940 * - old personality can be suspended
2941 * - new personality will access other array.
2944 if (mddev
->sync_thread
||
2945 mddev
->reshape_position
!= MaxSector
||
2946 mddev
->sysfs_active
)
2949 if (!mddev
->pers
->quiesce
) {
2950 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
2951 mdname(mddev
), mddev
->pers
->name
);
2955 /* Now find the new personality */
2956 if (len
== 0 || len
>= sizeof(clevel
))
2958 strncpy(clevel
, buf
, len
);
2959 if (clevel
[len
-1] == '\n')
2962 if (strict_strtol(clevel
, 10, &level
))
2965 if (request_module("md-%s", clevel
) != 0)
2966 request_module("md-level-%s", clevel
);
2967 spin_lock(&pers_lock
);
2968 pers
= find_pers(level
, clevel
);
2969 if (!pers
|| !try_module_get(pers
->owner
)) {
2970 spin_unlock(&pers_lock
);
2971 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
2974 spin_unlock(&pers_lock
);
2976 if (pers
== mddev
->pers
) {
2977 /* Nothing to do! */
2978 module_put(pers
->owner
);
2981 if (!pers
->takeover
) {
2982 module_put(pers
->owner
);
2983 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
2984 mdname(mddev
), clevel
);
2988 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2989 rdev
->new_raid_disk
= rdev
->raid_disk
;
2991 /* ->takeover must set new_* and/or delta_disks
2992 * if it succeeds, and may set them when it fails.
2994 priv
= pers
->takeover(mddev
);
2996 mddev
->new_level
= mddev
->level
;
2997 mddev
->new_layout
= mddev
->layout
;
2998 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
2999 mddev
->raid_disks
-= mddev
->delta_disks
;
3000 mddev
->delta_disks
= 0;
3001 module_put(pers
->owner
);
3002 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3003 mdname(mddev
), clevel
);
3004 return PTR_ERR(priv
);
3007 /* Looks like we have a winner */
3008 mddev_suspend(mddev
);
3009 mddev
->pers
->stop(mddev
);
3011 if (mddev
->pers
->sync_request
== NULL
&&
3012 pers
->sync_request
!= NULL
) {
3013 /* need to add the md_redundancy_group */
3014 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3016 "md: cannot register extra attributes for %s\n",
3018 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3020 if (mddev
->pers
->sync_request
!= NULL
&&
3021 pers
->sync_request
== NULL
) {
3022 /* need to remove the md_redundancy_group */
3023 if (mddev
->to_remove
== NULL
)
3024 mddev
->to_remove
= &md_redundancy_group
;
3027 if (mddev
->pers
->sync_request
== NULL
&&
3029 /* We are converting from a no-redundancy array
3030 * to a redundancy array and metadata is managed
3031 * externally so we need to be sure that writes
3032 * won't block due to a need to transition
3034 * until external management is started.
3037 mddev
->safemode_delay
= 0;
3038 mddev
->safemode
= 0;
3041 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3043 if (rdev
->raid_disk
< 0)
3045 if (rdev
->new_raid_disk
> mddev
->raid_disks
)
3046 rdev
->new_raid_disk
= -1;
3047 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3049 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3050 sysfs_remove_link(&mddev
->kobj
, nm
);
3052 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3053 if (rdev
->raid_disk
< 0)
3055 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3057 rdev
->raid_disk
= rdev
->new_raid_disk
;
3058 if (rdev
->raid_disk
< 0)
3059 clear_bit(In_sync
, &rdev
->flags
);
3062 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3063 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3064 printk("md: cannot register %s for %s after level change\n",
3069 module_put(mddev
->pers
->owner
);
3071 mddev
->private = priv
;
3072 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3073 mddev
->level
= mddev
->new_level
;
3074 mddev
->layout
= mddev
->new_layout
;
3075 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3076 mddev
->delta_disks
= 0;
3077 if (mddev
->pers
->sync_request
== NULL
) {
3078 /* this is now an array without redundancy, so
3079 * it must always be in_sync
3082 del_timer_sync(&mddev
->safemode_timer
);
3085 mddev_resume(mddev
);
3086 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3087 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3088 md_wakeup_thread(mddev
->thread
);
3089 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3090 md_new_event(mddev
);
3094 static struct md_sysfs_entry md_level
=
3095 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3099 layout_show(mddev_t
*mddev
, char *page
)
3101 /* just a number, not meaningful for all levels */
3102 if (mddev
->reshape_position
!= MaxSector
&&
3103 mddev
->layout
!= mddev
->new_layout
)
3104 return sprintf(page
, "%d (%d)\n",
3105 mddev
->new_layout
, mddev
->layout
);
3106 return sprintf(page
, "%d\n", mddev
->layout
);
3110 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3113 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3115 if (!*buf
|| (*e
&& *e
!= '\n'))
3120 if (mddev
->pers
->check_reshape
== NULL
)
3122 mddev
->new_layout
= n
;
3123 err
= mddev
->pers
->check_reshape(mddev
);
3125 mddev
->new_layout
= mddev
->layout
;
3129 mddev
->new_layout
= n
;
3130 if (mddev
->reshape_position
== MaxSector
)
3135 static struct md_sysfs_entry md_layout
=
3136 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3140 raid_disks_show(mddev_t
*mddev
, char *page
)
3142 if (mddev
->raid_disks
== 0)
3144 if (mddev
->reshape_position
!= MaxSector
&&
3145 mddev
->delta_disks
!= 0)
3146 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3147 mddev
->raid_disks
- mddev
->delta_disks
);
3148 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3151 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3154 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3158 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3160 if (!*buf
|| (*e
&& *e
!= '\n'))
3164 rv
= update_raid_disks(mddev
, n
);
3165 else if (mddev
->reshape_position
!= MaxSector
) {
3166 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3167 mddev
->delta_disks
= n
- olddisks
;
3168 mddev
->raid_disks
= n
;
3170 mddev
->raid_disks
= n
;
3171 return rv
? rv
: len
;
3173 static struct md_sysfs_entry md_raid_disks
=
3174 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3177 chunk_size_show(mddev_t
*mddev
, char *page
)
3179 if (mddev
->reshape_position
!= MaxSector
&&
3180 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3181 return sprintf(page
, "%d (%d)\n",
3182 mddev
->new_chunk_sectors
<< 9,
3183 mddev
->chunk_sectors
<< 9);
3184 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3188 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3191 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3193 if (!*buf
|| (*e
&& *e
!= '\n'))
3198 if (mddev
->pers
->check_reshape
== NULL
)
3200 mddev
->new_chunk_sectors
= n
>> 9;
3201 err
= mddev
->pers
->check_reshape(mddev
);
3203 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3207 mddev
->new_chunk_sectors
= n
>> 9;
3208 if (mddev
->reshape_position
== MaxSector
)
3209 mddev
->chunk_sectors
= n
>> 9;
3213 static struct md_sysfs_entry md_chunk_size
=
3214 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3217 resync_start_show(mddev_t
*mddev
, char *page
)
3219 if (mddev
->recovery_cp
== MaxSector
)
3220 return sprintf(page
, "none\n");
3221 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3225 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3228 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3232 if (cmd_match(buf
, "none"))
3234 else if (!*buf
|| (*e
&& *e
!= '\n'))
3237 mddev
->recovery_cp
= n
;
3240 static struct md_sysfs_entry md_resync_start
=
3241 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3244 * The array state can be:
3247 * No devices, no size, no level
3248 * Equivalent to STOP_ARRAY ioctl
3250 * May have some settings, but array is not active
3251 * all IO results in error
3252 * When written, doesn't tear down array, but just stops it
3253 * suspended (not supported yet)
3254 * All IO requests will block. The array can be reconfigured.
3255 * Writing this, if accepted, will block until array is quiescent
3257 * no resync can happen. no superblocks get written.
3258 * write requests fail
3260 * like readonly, but behaves like 'clean' on a write request.
3262 * clean - no pending writes, but otherwise active.
3263 * When written to inactive array, starts without resync
3264 * If a write request arrives then
3265 * if metadata is known, mark 'dirty' and switch to 'active'.
3266 * if not known, block and switch to write-pending
3267 * If written to an active array that has pending writes, then fails.
3269 * fully active: IO and resync can be happening.
3270 * When written to inactive array, starts with resync
3273 * clean, but writes are blocked waiting for 'active' to be written.
3276 * like active, but no writes have been seen for a while (100msec).
3279 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3280 write_pending
, active_idle
, bad_word
};
3281 static char *array_states
[] = {
3282 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3283 "write-pending", "active-idle", NULL
};
3285 static int match_word(const char *word
, char **list
)
3288 for (n
=0; list
[n
]; n
++)
3289 if (cmd_match(word
, list
[n
]))
3295 array_state_show(mddev_t
*mddev
, char *page
)
3297 enum array_state st
= inactive
;
3310 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3312 else if (mddev
->safemode
)
3318 if (list_empty(&mddev
->disks
) &&
3319 mddev
->raid_disks
== 0 &&
3320 mddev
->dev_sectors
== 0)
3325 return sprintf(page
, "%s\n", array_states
[st
]);
3328 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3329 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3330 static int do_md_run(mddev_t
* mddev
);
3331 static int restart_array(mddev_t
*mddev
);
3334 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3337 enum array_state st
= match_word(buf
, array_states
);
3342 /* stopping an active array */
3343 if (atomic_read(&mddev
->openers
) > 0)
3345 err
= do_md_stop(mddev
, 0, 0);
3348 /* stopping an active array */
3350 if (atomic_read(&mddev
->openers
) > 0)
3352 err
= do_md_stop(mddev
, 2, 0);
3354 err
= 0; /* already inactive */
3357 break; /* not supported yet */
3360 err
= md_set_readonly(mddev
, 0);
3363 set_disk_ro(mddev
->gendisk
, 1);
3364 err
= do_md_run(mddev
);
3370 err
= md_set_readonly(mddev
, 0);
3371 else if (mddev
->ro
== 1)
3372 err
= restart_array(mddev
);
3375 set_disk_ro(mddev
->gendisk
, 0);
3379 err
= do_md_run(mddev
);
3384 restart_array(mddev
);
3385 spin_lock_irq(&mddev
->write_lock
);
3386 if (atomic_read(&mddev
->writes_pending
) == 0) {
3387 if (mddev
->in_sync
== 0) {
3389 if (mddev
->safemode
== 1)
3390 mddev
->safemode
= 0;
3391 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3396 spin_unlock_irq(&mddev
->write_lock
);
3402 restart_array(mddev
);
3403 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3404 wake_up(&mddev
->sb_wait
);
3408 set_disk_ro(mddev
->gendisk
, 0);
3409 err
= do_md_run(mddev
);
3414 /* these cannot be set */
3420 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3424 static struct md_sysfs_entry md_array_state
=
3425 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3428 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3429 return sprintf(page
, "%d\n",
3430 atomic_read(&mddev
->max_corr_read_errors
));
3434 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3437 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3439 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3440 atomic_set(&mddev
->max_corr_read_errors
, n
);
3446 static struct md_sysfs_entry max_corr_read_errors
=
3447 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3448 max_corrected_read_errors_store
);
3451 null_show(mddev_t
*mddev
, char *page
)
3457 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3459 /* buf must be %d:%d\n? giving major and minor numbers */
3460 /* The new device is added to the array.
3461 * If the array has a persistent superblock, we read the
3462 * superblock to initialise info and check validity.
3463 * Otherwise, only checking done is that in bind_rdev_to_array,
3464 * which mainly checks size.
3467 int major
= simple_strtoul(buf
, &e
, 10);
3473 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3475 minor
= simple_strtoul(e
+1, &e
, 10);
3476 if (*e
&& *e
!= '\n')
3478 dev
= MKDEV(major
, minor
);
3479 if (major
!= MAJOR(dev
) ||
3480 minor
!= MINOR(dev
))
3484 if (mddev
->persistent
) {
3485 rdev
= md_import_device(dev
, mddev
->major_version
,
3486 mddev
->minor_version
);
3487 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3488 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3489 mdk_rdev_t
, same_set
);
3490 err
= super_types
[mddev
->major_version
]
3491 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3495 } else if (mddev
->external
)
3496 rdev
= md_import_device(dev
, -2, -1);
3498 rdev
= md_import_device(dev
, -1, -1);
3501 return PTR_ERR(rdev
);
3502 err
= bind_rdev_to_array(rdev
, mddev
);
3506 return err
? err
: len
;
3509 static struct md_sysfs_entry md_new_device
=
3510 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3513 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3516 unsigned long chunk
, end_chunk
;
3520 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3522 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3523 if (buf
== end
) break;
3524 if (*end
== '-') { /* range */
3526 end_chunk
= simple_strtoul(buf
, &end
, 0);
3527 if (buf
== end
) break;
3529 if (*end
&& !isspace(*end
)) break;
3530 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3531 buf
= skip_spaces(end
);
3533 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3538 static struct md_sysfs_entry md_bitmap
=
3539 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3542 size_show(mddev_t
*mddev
, char *page
)
3544 return sprintf(page
, "%llu\n",
3545 (unsigned long long)mddev
->dev_sectors
/ 2);
3548 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3551 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3553 /* If array is inactive, we can reduce the component size, but
3554 * not increase it (except from 0).
3555 * If array is active, we can try an on-line resize
3558 int err
= strict_blocks_to_sectors(buf
, §ors
);
3563 err
= update_size(mddev
, sectors
);
3564 md_update_sb(mddev
, 1);
3566 if (mddev
->dev_sectors
== 0 ||
3567 mddev
->dev_sectors
> sectors
)
3568 mddev
->dev_sectors
= sectors
;
3572 return err
? err
: len
;
3575 static struct md_sysfs_entry md_size
=
3576 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3581 * 'none' for arrays with no metadata (good luck...)
3582 * 'external' for arrays with externally managed metadata,
3583 * or N.M for internally known formats
3586 metadata_show(mddev_t
*mddev
, char *page
)
3588 if (mddev
->persistent
)
3589 return sprintf(page
, "%d.%d\n",
3590 mddev
->major_version
, mddev
->minor_version
);
3591 else if (mddev
->external
)
3592 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3594 return sprintf(page
, "none\n");
3598 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3602 /* Changing the details of 'external' metadata is
3603 * always permitted. Otherwise there must be
3604 * no devices attached to the array.
3606 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3608 else if (!list_empty(&mddev
->disks
))
3611 if (cmd_match(buf
, "none")) {
3612 mddev
->persistent
= 0;
3613 mddev
->external
= 0;
3614 mddev
->major_version
= 0;
3615 mddev
->minor_version
= 90;
3618 if (strncmp(buf
, "external:", 9) == 0) {
3619 size_t namelen
= len
-9;
3620 if (namelen
>= sizeof(mddev
->metadata_type
))
3621 namelen
= sizeof(mddev
->metadata_type
)-1;
3622 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3623 mddev
->metadata_type
[namelen
] = 0;
3624 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3625 mddev
->metadata_type
[--namelen
] = 0;
3626 mddev
->persistent
= 0;
3627 mddev
->external
= 1;
3628 mddev
->major_version
= 0;
3629 mddev
->minor_version
= 90;
3632 major
= simple_strtoul(buf
, &e
, 10);
3633 if (e
==buf
|| *e
!= '.')
3636 minor
= simple_strtoul(buf
, &e
, 10);
3637 if (e
==buf
|| (*e
&& *e
!= '\n') )
3639 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3641 mddev
->major_version
= major
;
3642 mddev
->minor_version
= minor
;
3643 mddev
->persistent
= 1;
3644 mddev
->external
= 0;
3648 static struct md_sysfs_entry md_metadata
=
3649 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3652 action_show(mddev_t
*mddev
, char *page
)
3654 char *type
= "idle";
3655 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3657 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3658 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3659 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3661 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3662 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3664 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3668 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3671 return sprintf(page
, "%s\n", type
);
3675 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3677 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3680 if (cmd_match(page
, "frozen"))
3681 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3683 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3685 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3686 if (mddev
->sync_thread
) {
3687 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3688 md_unregister_thread(mddev
->sync_thread
);
3689 mddev
->sync_thread
= NULL
;
3690 mddev
->recovery
= 0;
3692 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3693 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3695 else if (cmd_match(page
, "resync"))
3696 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3697 else if (cmd_match(page
, "recover")) {
3698 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3699 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3700 } else if (cmd_match(page
, "reshape")) {
3702 if (mddev
->pers
->start_reshape
== NULL
)
3704 err
= mddev
->pers
->start_reshape(mddev
);
3707 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3709 if (cmd_match(page
, "check"))
3710 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3711 else if (!cmd_match(page
, "repair"))
3713 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3714 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3716 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3717 md_wakeup_thread(mddev
->thread
);
3718 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3723 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3725 return sprintf(page
, "%llu\n",
3726 (unsigned long long) mddev
->resync_mismatches
);
3729 static struct md_sysfs_entry md_scan_mode
=
3730 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3733 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3736 sync_min_show(mddev_t
*mddev
, char *page
)
3738 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3739 mddev
->sync_speed_min
? "local": "system");
3743 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3747 if (strncmp(buf
, "system", 6)==0) {
3748 mddev
->sync_speed_min
= 0;
3751 min
= simple_strtoul(buf
, &e
, 10);
3752 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3754 mddev
->sync_speed_min
= min
;
3758 static struct md_sysfs_entry md_sync_min
=
3759 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3762 sync_max_show(mddev_t
*mddev
, char *page
)
3764 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3765 mddev
->sync_speed_max
? "local": "system");
3769 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3773 if (strncmp(buf
, "system", 6)==0) {
3774 mddev
->sync_speed_max
= 0;
3777 max
= simple_strtoul(buf
, &e
, 10);
3778 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3780 mddev
->sync_speed_max
= max
;
3784 static struct md_sysfs_entry md_sync_max
=
3785 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3788 degraded_show(mddev_t
*mddev
, char *page
)
3790 return sprintf(page
, "%d\n", mddev
->degraded
);
3792 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3795 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3797 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3801 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3805 if (strict_strtol(buf
, 10, &n
))
3808 if (n
!= 0 && n
!= 1)
3811 mddev
->parallel_resync
= n
;
3813 if (mddev
->sync_thread
)
3814 wake_up(&resync_wait
);
3819 /* force parallel resync, even with shared block devices */
3820 static struct md_sysfs_entry md_sync_force_parallel
=
3821 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3822 sync_force_parallel_show
, sync_force_parallel_store
);
3825 sync_speed_show(mddev_t
*mddev
, char *page
)
3827 unsigned long resync
, dt
, db
;
3828 if (mddev
->curr_resync
== 0)
3829 return sprintf(page
, "none\n");
3830 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3831 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3833 db
= resync
- mddev
->resync_mark_cnt
;
3834 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3837 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3840 sync_completed_show(mddev_t
*mddev
, char *page
)
3842 unsigned long max_sectors
, resync
;
3844 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3845 return sprintf(page
, "none\n");
3847 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3848 max_sectors
= mddev
->resync_max_sectors
;
3850 max_sectors
= mddev
->dev_sectors
;
3852 resync
= mddev
->curr_resync_completed
;
3853 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3856 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3859 min_sync_show(mddev_t
*mddev
, char *page
)
3861 return sprintf(page
, "%llu\n",
3862 (unsigned long long)mddev
->resync_min
);
3865 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3867 unsigned long long min
;
3868 if (strict_strtoull(buf
, 10, &min
))
3870 if (min
> mddev
->resync_max
)
3872 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3875 /* Must be a multiple of chunk_size */
3876 if (mddev
->chunk_sectors
) {
3877 sector_t temp
= min
;
3878 if (sector_div(temp
, mddev
->chunk_sectors
))
3881 mddev
->resync_min
= min
;
3886 static struct md_sysfs_entry md_min_sync
=
3887 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3890 max_sync_show(mddev_t
*mddev
, char *page
)
3892 if (mddev
->resync_max
== MaxSector
)
3893 return sprintf(page
, "max\n");
3895 return sprintf(page
, "%llu\n",
3896 (unsigned long long)mddev
->resync_max
);
3899 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3901 if (strncmp(buf
, "max", 3) == 0)
3902 mddev
->resync_max
= MaxSector
;
3904 unsigned long long max
;
3905 if (strict_strtoull(buf
, 10, &max
))
3907 if (max
< mddev
->resync_min
)
3909 if (max
< mddev
->resync_max
&&
3911 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3914 /* Must be a multiple of chunk_size */
3915 if (mddev
->chunk_sectors
) {
3916 sector_t temp
= max
;
3917 if (sector_div(temp
, mddev
->chunk_sectors
))
3920 mddev
->resync_max
= max
;
3922 wake_up(&mddev
->recovery_wait
);
3926 static struct md_sysfs_entry md_max_sync
=
3927 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3930 suspend_lo_show(mddev_t
*mddev
, char *page
)
3932 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3936 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3939 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3941 if (mddev
->pers
== NULL
||
3942 mddev
->pers
->quiesce
== NULL
)
3944 if (buf
== e
|| (*e
&& *e
!= '\n'))
3946 if (new >= mddev
->suspend_hi
||
3947 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3948 mddev
->suspend_lo
= new;
3949 mddev
->pers
->quiesce(mddev
, 2);
3954 static struct md_sysfs_entry md_suspend_lo
=
3955 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3959 suspend_hi_show(mddev_t
*mddev
, char *page
)
3961 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3965 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3968 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3970 if (mddev
->pers
== NULL
||
3971 mddev
->pers
->quiesce
== NULL
)
3973 if (buf
== e
|| (*e
&& *e
!= '\n'))
3975 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3976 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3977 mddev
->suspend_hi
= new;
3978 mddev
->pers
->quiesce(mddev
, 1);
3979 mddev
->pers
->quiesce(mddev
, 0);
3984 static struct md_sysfs_entry md_suspend_hi
=
3985 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3988 reshape_position_show(mddev_t
*mddev
, char *page
)
3990 if (mddev
->reshape_position
!= MaxSector
)
3991 return sprintf(page
, "%llu\n",
3992 (unsigned long long)mddev
->reshape_position
);
3993 strcpy(page
, "none\n");
3998 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4001 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4004 if (buf
== e
|| (*e
&& *e
!= '\n'))
4006 mddev
->reshape_position
= new;
4007 mddev
->delta_disks
= 0;
4008 mddev
->new_level
= mddev
->level
;
4009 mddev
->new_layout
= mddev
->layout
;
4010 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4014 static struct md_sysfs_entry md_reshape_position
=
4015 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4016 reshape_position_store
);
4019 array_size_show(mddev_t
*mddev
, char *page
)
4021 if (mddev
->external_size
)
4022 return sprintf(page
, "%llu\n",
4023 (unsigned long long)mddev
->array_sectors
/2);
4025 return sprintf(page
, "default\n");
4029 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4033 if (strncmp(buf
, "default", 7) == 0) {
4035 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4037 sectors
= mddev
->array_sectors
;
4039 mddev
->external_size
= 0;
4041 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4043 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4046 mddev
->external_size
= 1;
4049 mddev
->array_sectors
= sectors
;
4050 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4052 revalidate_disk(mddev
->gendisk
);
4057 static struct md_sysfs_entry md_array_size
=
4058 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4061 static struct attribute
*md_default_attrs
[] = {
4064 &md_raid_disks
.attr
,
4065 &md_chunk_size
.attr
,
4067 &md_resync_start
.attr
,
4069 &md_new_device
.attr
,
4070 &md_safe_delay
.attr
,
4071 &md_array_state
.attr
,
4072 &md_reshape_position
.attr
,
4073 &md_array_size
.attr
,
4074 &max_corr_read_errors
.attr
,
4078 static struct attribute
*md_redundancy_attrs
[] = {
4080 &md_mismatches
.attr
,
4083 &md_sync_speed
.attr
,
4084 &md_sync_force_parallel
.attr
,
4085 &md_sync_completed
.attr
,
4088 &md_suspend_lo
.attr
,
4089 &md_suspend_hi
.attr
,
4094 static struct attribute_group md_redundancy_group
= {
4096 .attrs
= md_redundancy_attrs
,
4101 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4103 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4104 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4109 rv
= mddev_lock(mddev
);
4111 rv
= entry
->show(mddev
, page
);
4112 mddev_unlock(mddev
);
4118 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4119 const char *page
, size_t length
)
4121 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4122 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4127 if (!capable(CAP_SYS_ADMIN
))
4129 rv
= mddev_lock(mddev
);
4130 if (mddev
->hold_active
== UNTIL_IOCTL
)
4131 mddev
->hold_active
= 0;
4133 rv
= entry
->store(mddev
, page
, length
);
4134 mddev_unlock(mddev
);
4139 static void md_free(struct kobject
*ko
)
4141 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4143 if (mddev
->sysfs_state
)
4144 sysfs_put(mddev
->sysfs_state
);
4146 if (mddev
->gendisk
) {
4147 del_gendisk(mddev
->gendisk
);
4148 put_disk(mddev
->gendisk
);
4151 blk_cleanup_queue(mddev
->queue
);
4156 static const struct sysfs_ops md_sysfs_ops
= {
4157 .show
= md_attr_show
,
4158 .store
= md_attr_store
,
4160 static struct kobj_type md_ktype
= {
4162 .sysfs_ops
= &md_sysfs_ops
,
4163 .default_attrs
= md_default_attrs
,
4168 static void mddev_delayed_delete(struct work_struct
*ws
)
4170 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4172 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4173 kobject_del(&mddev
->kobj
);
4174 kobject_put(&mddev
->kobj
);
4177 static int md_alloc(dev_t dev
, char *name
)
4179 static DEFINE_MUTEX(disks_mutex
);
4180 mddev_t
*mddev
= mddev_find(dev
);
4181 struct gendisk
*disk
;
4190 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4191 shift
= partitioned
? MdpMinorShift
: 0;
4192 unit
= MINOR(mddev
->unit
) >> shift
;
4194 /* wait for any previous instance if this device
4195 * to be completed removed (mddev_delayed_delete).
4197 flush_scheduled_work();
4199 mutex_lock(&disks_mutex
);
4205 /* Need to ensure that 'name' is not a duplicate.
4208 spin_lock(&all_mddevs_lock
);
4210 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4211 if (mddev2
->gendisk
&&
4212 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4213 spin_unlock(&all_mddevs_lock
);
4216 spin_unlock(&all_mddevs_lock
);
4220 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4223 mddev
->queue
->queuedata
= mddev
;
4225 /* Can be unlocked because the queue is new: no concurrency */
4226 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
4228 blk_queue_make_request(mddev
->queue
, md_make_request
);
4230 disk
= alloc_disk(1 << shift
);
4232 blk_cleanup_queue(mddev
->queue
);
4233 mddev
->queue
= NULL
;
4236 disk
->major
= MAJOR(mddev
->unit
);
4237 disk
->first_minor
= unit
<< shift
;
4239 strcpy(disk
->disk_name
, name
);
4240 else if (partitioned
)
4241 sprintf(disk
->disk_name
, "md_d%d", unit
);
4243 sprintf(disk
->disk_name
, "md%d", unit
);
4244 disk
->fops
= &md_fops
;
4245 disk
->private_data
= mddev
;
4246 disk
->queue
= mddev
->queue
;
4247 /* Allow extended partitions. This makes the
4248 * 'mdp' device redundant, but we can't really
4251 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4253 mddev
->gendisk
= disk
;
4254 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4255 &disk_to_dev(disk
)->kobj
, "%s", "md");
4257 /* This isn't possible, but as kobject_init_and_add is marked
4258 * __must_check, we must do something with the result
4260 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4264 if (mddev
->kobj
.sd
&&
4265 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4266 printk(KERN_DEBUG
"pointless warning\n");
4268 mutex_unlock(&disks_mutex
);
4269 if (!error
&& mddev
->kobj
.sd
) {
4270 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4271 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4277 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4279 md_alloc(dev
, NULL
);
4283 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4285 /* val must be "md_*" where * is not all digits.
4286 * We allocate an array with a large free minor number, and
4287 * set the name to val. val must not already be an active name.
4289 int len
= strlen(val
);
4290 char buf
[DISK_NAME_LEN
];
4292 while (len
&& val
[len
-1] == '\n')
4294 if (len
>= DISK_NAME_LEN
)
4296 strlcpy(buf
, val
, len
+1);
4297 if (strncmp(buf
, "md_", 3) != 0)
4299 return md_alloc(0, buf
);
4302 static void md_safemode_timeout(unsigned long data
)
4304 mddev_t
*mddev
= (mddev_t
*) data
;
4306 if (!atomic_read(&mddev
->writes_pending
)) {
4307 mddev
->safemode
= 1;
4308 if (mddev
->external
)
4309 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4311 md_wakeup_thread(mddev
->thread
);
4314 static int start_dirty_degraded
;
4316 int md_run(mddev_t
*mddev
)
4320 struct mdk_personality
*pers
;
4322 if (list_empty(&mddev
->disks
))
4323 /* cannot run an array with no devices.. */
4328 /* Cannot run until previous stop completes properly */
4329 if (mddev
->sysfs_active
)
4333 * Analyze all RAID superblock(s)
4335 if (!mddev
->raid_disks
) {
4336 if (!mddev
->persistent
)
4341 if (mddev
->level
!= LEVEL_NONE
)
4342 request_module("md-level-%d", mddev
->level
);
4343 else if (mddev
->clevel
[0])
4344 request_module("md-%s", mddev
->clevel
);
4347 * Drop all container device buffers, from now on
4348 * the only valid external interface is through the md
4351 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4352 if (test_bit(Faulty
, &rdev
->flags
))
4354 sync_blockdev(rdev
->bdev
);
4355 invalidate_bdev(rdev
->bdev
);
4357 /* perform some consistency tests on the device.
4358 * We don't want the data to overlap the metadata,
4359 * Internal Bitmap issues have been handled elsewhere.
4361 if (rdev
->data_offset
< rdev
->sb_start
) {
4362 if (mddev
->dev_sectors
&&
4363 rdev
->data_offset
+ mddev
->dev_sectors
4365 printk("md: %s: data overlaps metadata\n",
4370 if (rdev
->sb_start
+ rdev
->sb_size
/512
4371 > rdev
->data_offset
) {
4372 printk("md: %s: metadata overlaps data\n",
4377 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4380 spin_lock(&pers_lock
);
4381 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4382 if (!pers
|| !try_module_get(pers
->owner
)) {
4383 spin_unlock(&pers_lock
);
4384 if (mddev
->level
!= LEVEL_NONE
)
4385 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4388 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4393 spin_unlock(&pers_lock
);
4394 if (mddev
->level
!= pers
->level
) {
4395 mddev
->level
= pers
->level
;
4396 mddev
->new_level
= pers
->level
;
4398 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4400 if (mddev
->reshape_position
!= MaxSector
&&
4401 pers
->start_reshape
== NULL
) {
4402 /* This personality cannot handle reshaping... */
4404 module_put(pers
->owner
);
4408 if (pers
->sync_request
) {
4409 /* Warn if this is a potentially silly
4412 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4416 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4417 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4419 rdev
->bdev
->bd_contains
==
4420 rdev2
->bdev
->bd_contains
) {
4422 "%s: WARNING: %s appears to be"
4423 " on the same physical disk as"
4426 bdevname(rdev
->bdev
,b
),
4427 bdevname(rdev2
->bdev
,b2
));
4434 "True protection against single-disk"
4435 " failure might be compromised.\n");
4438 mddev
->recovery
= 0;
4439 /* may be over-ridden by personality */
4440 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4442 mddev
->ok_start_degraded
= start_dirty_degraded
;
4444 if (start_readonly
&& mddev
->ro
== 0)
4445 mddev
->ro
= 2; /* read-only, but switch on first write */
4447 err
= mddev
->pers
->run(mddev
);
4449 printk(KERN_ERR
"md: pers->run() failed ...\n");
4450 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4451 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4452 " but 'external_size' not in effect?\n", __func__
);
4454 "md: invalid array_size %llu > default size %llu\n",
4455 (unsigned long long)mddev
->array_sectors
/ 2,
4456 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4458 mddev
->pers
->stop(mddev
);
4460 if (err
== 0 && mddev
->pers
->sync_request
) {
4461 err
= bitmap_create(mddev
);
4463 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4464 mdname(mddev
), err
);
4465 mddev
->pers
->stop(mddev
);
4469 module_put(mddev
->pers
->owner
);
4471 bitmap_destroy(mddev
);
4474 if (mddev
->pers
->sync_request
) {
4475 if (mddev
->kobj
.sd
&&
4476 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4478 "md: cannot register extra attributes for %s\n",
4480 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4481 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4484 atomic_set(&mddev
->writes_pending
,0);
4485 atomic_set(&mddev
->max_corr_read_errors
,
4486 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4487 mddev
->safemode
= 0;
4488 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4489 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4490 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4493 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4494 if (rdev
->raid_disk
>= 0) {
4496 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4497 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4498 /* failure here is OK */;
4501 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4504 md_update_sb(mddev
, 0);
4506 md_wakeup_thread(mddev
->thread
);
4507 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4509 md_new_event(mddev
);
4510 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4511 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4512 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4515 EXPORT_SYMBOL_GPL(md_run
);
4517 static int do_md_run(mddev_t
*mddev
)
4521 err
= md_run(mddev
);
4524 err
= bitmap_load(mddev
);
4526 bitmap_destroy(mddev
);
4529 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4530 revalidate_disk(mddev
->gendisk
);
4531 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4536 static int restart_array(mddev_t
*mddev
)
4538 struct gendisk
*disk
= mddev
->gendisk
;
4540 /* Complain if it has no devices */
4541 if (list_empty(&mddev
->disks
))
4547 mddev
->safemode
= 0;
4549 set_disk_ro(disk
, 0);
4550 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4552 /* Kick recovery or resync if necessary */
4553 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4554 md_wakeup_thread(mddev
->thread
);
4555 md_wakeup_thread(mddev
->sync_thread
);
4556 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4560 /* similar to deny_write_access, but accounts for our holding a reference
4561 * to the file ourselves */
4562 static int deny_bitmap_write_access(struct file
* file
)
4564 struct inode
*inode
= file
->f_mapping
->host
;
4566 spin_lock(&inode
->i_lock
);
4567 if (atomic_read(&inode
->i_writecount
) > 1) {
4568 spin_unlock(&inode
->i_lock
);
4571 atomic_set(&inode
->i_writecount
, -1);
4572 spin_unlock(&inode
->i_lock
);
4577 void restore_bitmap_write_access(struct file
*file
)
4579 struct inode
*inode
= file
->f_mapping
->host
;
4581 spin_lock(&inode
->i_lock
);
4582 atomic_set(&inode
->i_writecount
, 1);
4583 spin_unlock(&inode
->i_lock
);
4586 static void md_clean(mddev_t
*mddev
)
4588 mddev
->array_sectors
= 0;
4589 mddev
->external_size
= 0;
4590 mddev
->dev_sectors
= 0;
4591 mddev
->raid_disks
= 0;
4592 mddev
->recovery_cp
= 0;
4593 mddev
->resync_min
= 0;
4594 mddev
->resync_max
= MaxSector
;
4595 mddev
->reshape_position
= MaxSector
;
4596 mddev
->external
= 0;
4597 mddev
->persistent
= 0;
4598 mddev
->level
= LEVEL_NONE
;
4599 mddev
->clevel
[0] = 0;
4602 mddev
->metadata_type
[0] = 0;
4603 mddev
->chunk_sectors
= 0;
4604 mddev
->ctime
= mddev
->utime
= 0;
4606 mddev
->max_disks
= 0;
4608 mddev
->can_decrease_events
= 0;
4609 mddev
->delta_disks
= 0;
4610 mddev
->new_level
= LEVEL_NONE
;
4611 mddev
->new_layout
= 0;
4612 mddev
->new_chunk_sectors
= 0;
4613 mddev
->curr_resync
= 0;
4614 mddev
->resync_mismatches
= 0;
4615 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4616 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4617 mddev
->recovery
= 0;
4619 mddev
->degraded
= 0;
4620 mddev
->safemode
= 0;
4621 mddev
->bitmap_info
.offset
= 0;
4622 mddev
->bitmap_info
.default_offset
= 0;
4623 mddev
->bitmap_info
.chunksize
= 0;
4624 mddev
->bitmap_info
.daemon_sleep
= 0;
4625 mddev
->bitmap_info
.max_write_behind
= 0;
4629 void md_stop_writes(mddev_t
*mddev
)
4631 if (mddev
->sync_thread
) {
4632 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4633 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4634 md_unregister_thread(mddev
->sync_thread
);
4635 mddev
->sync_thread
= NULL
;
4638 del_timer_sync(&mddev
->safemode_timer
);
4640 bitmap_flush(mddev
);
4641 md_super_wait(mddev
);
4643 if (!mddev
->in_sync
|| mddev
->flags
) {
4644 /* mark array as shutdown cleanly */
4646 md_update_sb(mddev
, 1);
4649 EXPORT_SYMBOL_GPL(md_stop_writes
);
4651 void md_stop(mddev_t
*mddev
)
4653 mddev
->pers
->stop(mddev
);
4654 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4655 mddev
->to_remove
= &md_redundancy_group
;
4656 module_put(mddev
->pers
->owner
);
4658 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4660 EXPORT_SYMBOL_GPL(md_stop
);
4662 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4665 mutex_lock(&mddev
->open_mutex
);
4666 if (atomic_read(&mddev
->openers
) > is_open
) {
4667 printk("md: %s still in use.\n",mdname(mddev
));
4672 md_stop_writes(mddev
);
4678 set_disk_ro(mddev
->gendisk
, 1);
4679 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4680 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4684 mutex_unlock(&mddev
->open_mutex
);
4689 * 0 - completely stop and dis-assemble array
4690 * 2 - stop but do not disassemble array
4692 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4694 struct gendisk
*disk
= mddev
->gendisk
;
4697 mutex_lock(&mddev
->open_mutex
);
4698 if (atomic_read(&mddev
->openers
) > is_open
||
4699 mddev
->sysfs_active
) {
4700 printk("md: %s still in use.\n",mdname(mddev
));
4701 mutex_unlock(&mddev
->open_mutex
);
4707 set_disk_ro(disk
, 0);
4709 md_stop_writes(mddev
);
4711 mddev
->queue
->merge_bvec_fn
= NULL
;
4712 mddev
->queue
->unplug_fn
= NULL
;
4713 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4715 /* tell userspace to handle 'inactive' */
4716 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4718 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4719 if (rdev
->raid_disk
>= 0) {
4721 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4722 sysfs_remove_link(&mddev
->kobj
, nm
);
4725 set_capacity(disk
, 0);
4726 mutex_unlock(&mddev
->open_mutex
);
4727 revalidate_disk(disk
);
4732 mutex_unlock(&mddev
->open_mutex
);
4734 * Free resources if final stop
4737 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4739 bitmap_destroy(mddev
);
4740 if (mddev
->bitmap_info
.file
) {
4741 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4742 fput(mddev
->bitmap_info
.file
);
4743 mddev
->bitmap_info
.file
= NULL
;
4745 mddev
->bitmap_info
.offset
= 0;
4747 export_array(mddev
);
4750 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4751 if (mddev
->hold_active
== UNTIL_STOP
)
4752 mddev
->hold_active
= 0;
4754 blk_integrity_unregister(disk
);
4755 md_new_event(mddev
);
4756 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4761 static void autorun_array(mddev_t
*mddev
)
4766 if (list_empty(&mddev
->disks
))
4769 printk(KERN_INFO
"md: running: ");
4771 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4772 char b
[BDEVNAME_SIZE
];
4773 printk("<%s>", bdevname(rdev
->bdev
,b
));
4777 err
= do_md_run(mddev
);
4779 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4780 do_md_stop(mddev
, 0, 0);
4785 * lets try to run arrays based on all disks that have arrived
4786 * until now. (those are in pending_raid_disks)
4788 * the method: pick the first pending disk, collect all disks with
4789 * the same UUID, remove all from the pending list and put them into
4790 * the 'same_array' list. Then order this list based on superblock
4791 * update time (freshest comes first), kick out 'old' disks and
4792 * compare superblocks. If everything's fine then run it.
4794 * If "unit" is allocated, then bump its reference count
4796 static void autorun_devices(int part
)
4798 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4800 char b
[BDEVNAME_SIZE
];
4802 printk(KERN_INFO
"md: autorun ...\n");
4803 while (!list_empty(&pending_raid_disks
)) {
4806 LIST_HEAD(candidates
);
4807 rdev0
= list_entry(pending_raid_disks
.next
,
4808 mdk_rdev_t
, same_set
);
4810 printk(KERN_INFO
"md: considering %s ...\n",
4811 bdevname(rdev0
->bdev
,b
));
4812 INIT_LIST_HEAD(&candidates
);
4813 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4814 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4815 printk(KERN_INFO
"md: adding %s ...\n",
4816 bdevname(rdev
->bdev
,b
));
4817 list_move(&rdev
->same_set
, &candidates
);
4820 * now we have a set of devices, with all of them having
4821 * mostly sane superblocks. It's time to allocate the
4825 dev
= MKDEV(mdp_major
,
4826 rdev0
->preferred_minor
<< MdpMinorShift
);
4827 unit
= MINOR(dev
) >> MdpMinorShift
;
4829 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4832 if (rdev0
->preferred_minor
!= unit
) {
4833 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4834 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4838 md_probe(dev
, NULL
, NULL
);
4839 mddev
= mddev_find(dev
);
4840 if (!mddev
|| !mddev
->gendisk
) {
4844 "md: cannot allocate memory for md drive.\n");
4847 if (mddev_lock(mddev
))
4848 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4850 else if (mddev
->raid_disks
|| mddev
->major_version
4851 || !list_empty(&mddev
->disks
)) {
4853 "md: %s already running, cannot run %s\n",
4854 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4855 mddev_unlock(mddev
);
4857 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4858 mddev
->persistent
= 1;
4859 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4860 list_del_init(&rdev
->same_set
);
4861 if (bind_rdev_to_array(rdev
, mddev
))
4864 autorun_array(mddev
);
4865 mddev_unlock(mddev
);
4867 /* on success, candidates will be empty, on error
4870 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4871 list_del_init(&rdev
->same_set
);
4876 printk(KERN_INFO
"md: ... autorun DONE.\n");
4878 #endif /* !MODULE */
4880 static int get_version(void __user
* arg
)
4884 ver
.major
= MD_MAJOR_VERSION
;
4885 ver
.minor
= MD_MINOR_VERSION
;
4886 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4888 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4894 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4896 mdu_array_info_t info
;
4897 int nr
,working
,insync
,failed
,spare
;
4900 nr
=working
=insync
=failed
=spare
=0;
4901 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4903 if (test_bit(Faulty
, &rdev
->flags
))
4907 if (test_bit(In_sync
, &rdev
->flags
))
4914 info
.major_version
= mddev
->major_version
;
4915 info
.minor_version
= mddev
->minor_version
;
4916 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4917 info
.ctime
= mddev
->ctime
;
4918 info
.level
= mddev
->level
;
4919 info
.size
= mddev
->dev_sectors
/ 2;
4920 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4923 info
.raid_disks
= mddev
->raid_disks
;
4924 info
.md_minor
= mddev
->md_minor
;
4925 info
.not_persistent
= !mddev
->persistent
;
4927 info
.utime
= mddev
->utime
;
4930 info
.state
= (1<<MD_SB_CLEAN
);
4931 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
4932 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4933 info
.active_disks
= insync
;
4934 info
.working_disks
= working
;
4935 info
.failed_disks
= failed
;
4936 info
.spare_disks
= spare
;
4938 info
.layout
= mddev
->layout
;
4939 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
4941 if (copy_to_user(arg
, &info
, sizeof(info
)))
4947 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4949 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4950 char *ptr
, *buf
= NULL
;
4953 if (md_allow_write(mddev
))
4954 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4956 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4961 /* bitmap disabled, zero the first byte and copy out */
4962 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4963 file
->pathname
[0] = '\0';
4967 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4971 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4975 strcpy(file
->pathname
, ptr
);
4979 if (copy_to_user(arg
, file
, sizeof(*file
)))
4987 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4989 mdu_disk_info_t info
;
4992 if (copy_from_user(&info
, arg
, sizeof(info
)))
4995 rdev
= find_rdev_nr(mddev
, info
.number
);
4997 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4998 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4999 info
.raid_disk
= rdev
->raid_disk
;
5001 if (test_bit(Faulty
, &rdev
->flags
))
5002 info
.state
|= (1<<MD_DISK_FAULTY
);
5003 else if (test_bit(In_sync
, &rdev
->flags
)) {
5004 info
.state
|= (1<<MD_DISK_ACTIVE
);
5005 info
.state
|= (1<<MD_DISK_SYNC
);
5007 if (test_bit(WriteMostly
, &rdev
->flags
))
5008 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5010 info
.major
= info
.minor
= 0;
5011 info
.raid_disk
= -1;
5012 info
.state
= (1<<MD_DISK_REMOVED
);
5015 if (copy_to_user(arg
, &info
, sizeof(info
)))
5021 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5023 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5025 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5027 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5030 if (!mddev
->raid_disks
) {
5032 /* expecting a device which has a superblock */
5033 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5036 "md: md_import_device returned %ld\n",
5038 return PTR_ERR(rdev
);
5040 if (!list_empty(&mddev
->disks
)) {
5041 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5042 mdk_rdev_t
, same_set
);
5043 err
= super_types
[mddev
->major_version
]
5044 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5047 "md: %s has different UUID to %s\n",
5048 bdevname(rdev
->bdev
,b
),
5049 bdevname(rdev0
->bdev
,b2
));
5054 err
= bind_rdev_to_array(rdev
, mddev
);
5061 * add_new_disk can be used once the array is assembled
5062 * to add "hot spares". They must already have a superblock
5067 if (!mddev
->pers
->hot_add_disk
) {
5069 "%s: personality does not support diskops!\n",
5073 if (mddev
->persistent
)
5074 rdev
= md_import_device(dev
, mddev
->major_version
,
5075 mddev
->minor_version
);
5077 rdev
= md_import_device(dev
, -1, -1);
5080 "md: md_import_device returned %ld\n",
5082 return PTR_ERR(rdev
);
5084 /* set save_raid_disk if appropriate */
5085 if (!mddev
->persistent
) {
5086 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5087 info
->raid_disk
< mddev
->raid_disks
)
5088 rdev
->raid_disk
= info
->raid_disk
;
5090 rdev
->raid_disk
= -1;
5092 super_types
[mddev
->major_version
].
5093 validate_super(mddev
, rdev
);
5094 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5096 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5097 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5098 set_bit(WriteMostly
, &rdev
->flags
);
5100 clear_bit(WriteMostly
, &rdev
->flags
);
5102 rdev
->raid_disk
= -1;
5103 err
= bind_rdev_to_array(rdev
, mddev
);
5104 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5105 /* If there is hot_add_disk but no hot_remove_disk
5106 * then added disks for geometry changes,
5107 * and should be added immediately.
5109 super_types
[mddev
->major_version
].
5110 validate_super(mddev
, rdev
);
5111 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5113 unbind_rdev_from_array(rdev
);
5118 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5120 md_update_sb(mddev
, 1);
5121 if (mddev
->degraded
)
5122 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5123 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5124 md_wakeup_thread(mddev
->thread
);
5128 /* otherwise, add_new_disk is only allowed
5129 * for major_version==0 superblocks
5131 if (mddev
->major_version
!= 0) {
5132 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5137 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5139 rdev
= md_import_device(dev
, -1, 0);
5142 "md: error, md_import_device() returned %ld\n",
5144 return PTR_ERR(rdev
);
5146 rdev
->desc_nr
= info
->number
;
5147 if (info
->raid_disk
< mddev
->raid_disks
)
5148 rdev
->raid_disk
= info
->raid_disk
;
5150 rdev
->raid_disk
= -1;
5152 if (rdev
->raid_disk
< mddev
->raid_disks
)
5153 if (info
->state
& (1<<MD_DISK_SYNC
))
5154 set_bit(In_sync
, &rdev
->flags
);
5156 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5157 set_bit(WriteMostly
, &rdev
->flags
);
5159 if (!mddev
->persistent
) {
5160 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5161 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5163 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5164 rdev
->sectors
= rdev
->sb_start
;
5166 err
= bind_rdev_to_array(rdev
, mddev
);
5176 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5178 char b
[BDEVNAME_SIZE
];
5181 rdev
= find_rdev(mddev
, dev
);
5185 if (rdev
->raid_disk
>= 0)
5188 kick_rdev_from_array(rdev
);
5189 md_update_sb(mddev
, 1);
5190 md_new_event(mddev
);
5194 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5195 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5199 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5201 char b
[BDEVNAME_SIZE
];
5208 if (mddev
->major_version
!= 0) {
5209 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5210 " version-0 superblocks.\n",
5214 if (!mddev
->pers
->hot_add_disk
) {
5216 "%s: personality does not support diskops!\n",
5221 rdev
= md_import_device(dev
, -1, 0);
5224 "md: error, md_import_device() returned %ld\n",
5229 if (mddev
->persistent
)
5230 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5232 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5234 rdev
->sectors
= rdev
->sb_start
;
5236 if (test_bit(Faulty
, &rdev
->flags
)) {
5238 "md: can not hot-add faulty %s disk to %s!\n",
5239 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5243 clear_bit(In_sync
, &rdev
->flags
);
5245 rdev
->saved_raid_disk
= -1;
5246 err
= bind_rdev_to_array(rdev
, mddev
);
5251 * The rest should better be atomic, we can have disk failures
5252 * noticed in interrupt contexts ...
5255 rdev
->raid_disk
= -1;
5257 md_update_sb(mddev
, 1);
5260 * Kick recovery, maybe this spare has to be added to the
5261 * array immediately.
5263 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5264 md_wakeup_thread(mddev
->thread
);
5265 md_new_event(mddev
);
5273 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5278 if (!mddev
->pers
->quiesce
)
5280 if (mddev
->recovery
|| mddev
->sync_thread
)
5282 /* we should be able to change the bitmap.. */
5288 return -EEXIST
; /* cannot add when bitmap is present */
5289 mddev
->bitmap_info
.file
= fget(fd
);
5291 if (mddev
->bitmap_info
.file
== NULL
) {
5292 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5297 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5299 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5301 fput(mddev
->bitmap_info
.file
);
5302 mddev
->bitmap_info
.file
= NULL
;
5305 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5306 } else if (mddev
->bitmap
== NULL
)
5307 return -ENOENT
; /* cannot remove what isn't there */
5310 mddev
->pers
->quiesce(mddev
, 1);
5312 err
= bitmap_create(mddev
);
5314 err
= bitmap_load(mddev
);
5316 if (fd
< 0 || err
) {
5317 bitmap_destroy(mddev
);
5318 fd
= -1; /* make sure to put the file */
5320 mddev
->pers
->quiesce(mddev
, 0);
5323 if (mddev
->bitmap_info
.file
) {
5324 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5325 fput(mddev
->bitmap_info
.file
);
5327 mddev
->bitmap_info
.file
= NULL
;
5334 * set_array_info is used two different ways
5335 * The original usage is when creating a new array.
5336 * In this usage, raid_disks is > 0 and it together with
5337 * level, size, not_persistent,layout,chunksize determine the
5338 * shape of the array.
5339 * This will always create an array with a type-0.90.0 superblock.
5340 * The newer usage is when assembling an array.
5341 * In this case raid_disks will be 0, and the major_version field is
5342 * use to determine which style super-blocks are to be found on the devices.
5343 * The minor and patch _version numbers are also kept incase the
5344 * super_block handler wishes to interpret them.
5346 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5349 if (info
->raid_disks
== 0) {
5350 /* just setting version number for superblock loading */
5351 if (info
->major_version
< 0 ||
5352 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5353 super_types
[info
->major_version
].name
== NULL
) {
5354 /* maybe try to auto-load a module? */
5356 "md: superblock version %d not known\n",
5357 info
->major_version
);
5360 mddev
->major_version
= info
->major_version
;
5361 mddev
->minor_version
= info
->minor_version
;
5362 mddev
->patch_version
= info
->patch_version
;
5363 mddev
->persistent
= !info
->not_persistent
;
5364 /* ensure mddev_put doesn't delete this now that there
5365 * is some minimal configuration.
5367 mddev
->ctime
= get_seconds();
5370 mddev
->major_version
= MD_MAJOR_VERSION
;
5371 mddev
->minor_version
= MD_MINOR_VERSION
;
5372 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5373 mddev
->ctime
= get_seconds();
5375 mddev
->level
= info
->level
;
5376 mddev
->clevel
[0] = 0;
5377 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5378 mddev
->raid_disks
= info
->raid_disks
;
5379 /* don't set md_minor, it is determined by which /dev/md* was
5382 if (info
->state
& (1<<MD_SB_CLEAN
))
5383 mddev
->recovery_cp
= MaxSector
;
5385 mddev
->recovery_cp
= 0;
5386 mddev
->persistent
= ! info
->not_persistent
;
5387 mddev
->external
= 0;
5389 mddev
->layout
= info
->layout
;
5390 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5392 mddev
->max_disks
= MD_SB_DISKS
;
5394 if (mddev
->persistent
)
5396 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5398 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5399 mddev
->bitmap_info
.offset
= 0;
5401 mddev
->reshape_position
= MaxSector
;
5404 * Generate a 128 bit UUID
5406 get_random_bytes(mddev
->uuid
, 16);
5408 mddev
->new_level
= mddev
->level
;
5409 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5410 mddev
->new_layout
= mddev
->layout
;
5411 mddev
->delta_disks
= 0;
5416 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5418 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5420 if (mddev
->external_size
)
5423 mddev
->array_sectors
= array_sectors
;
5425 EXPORT_SYMBOL(md_set_array_sectors
);
5427 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5431 int fit
= (num_sectors
== 0);
5433 if (mddev
->pers
->resize
== NULL
)
5435 /* The "num_sectors" is the number of sectors of each device that
5436 * is used. This can only make sense for arrays with redundancy.
5437 * linear and raid0 always use whatever space is available. We can only
5438 * consider changing this number if no resync or reconstruction is
5439 * happening, and if the new size is acceptable. It must fit before the
5440 * sb_start or, if that is <data_offset, it must fit before the size
5441 * of each device. If num_sectors is zero, we find the largest size
5445 if (mddev
->sync_thread
)
5448 /* Sorry, cannot grow a bitmap yet, just remove it,
5452 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5453 sector_t avail
= rdev
->sectors
;
5455 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5456 num_sectors
= avail
;
5457 if (avail
< num_sectors
)
5460 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5462 revalidate_disk(mddev
->gendisk
);
5466 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5469 /* change the number of raid disks */
5470 if (mddev
->pers
->check_reshape
== NULL
)
5472 if (raid_disks
<= 0 ||
5473 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5475 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5477 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5479 rv
= mddev
->pers
->check_reshape(mddev
);
5485 * update_array_info is used to change the configuration of an
5487 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5488 * fields in the info are checked against the array.
5489 * Any differences that cannot be handled will cause an error.
5490 * Normally, only one change can be managed at a time.
5492 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5498 /* calculate expected state,ignoring low bits */
5499 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5500 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5502 if (mddev
->major_version
!= info
->major_version
||
5503 mddev
->minor_version
!= info
->minor_version
||
5504 /* mddev->patch_version != info->patch_version || */
5505 mddev
->ctime
!= info
->ctime
||
5506 mddev
->level
!= info
->level
||
5507 /* mddev->layout != info->layout || */
5508 !mddev
->persistent
!= info
->not_persistent
||
5509 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5510 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5511 ((state
^info
->state
) & 0xfffffe00)
5514 /* Check there is only one change */
5515 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5517 if (mddev
->raid_disks
!= info
->raid_disks
)
5519 if (mddev
->layout
!= info
->layout
)
5521 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5528 if (mddev
->layout
!= info
->layout
) {
5530 * we don't need to do anything at the md level, the
5531 * personality will take care of it all.
5533 if (mddev
->pers
->check_reshape
== NULL
)
5536 mddev
->new_layout
= info
->layout
;
5537 rv
= mddev
->pers
->check_reshape(mddev
);
5539 mddev
->new_layout
= mddev
->layout
;
5543 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5544 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5546 if (mddev
->raid_disks
!= info
->raid_disks
)
5547 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5549 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5550 if (mddev
->pers
->quiesce
== NULL
)
5552 if (mddev
->recovery
|| mddev
->sync_thread
)
5554 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5555 /* add the bitmap */
5558 if (mddev
->bitmap_info
.default_offset
== 0)
5560 mddev
->bitmap_info
.offset
=
5561 mddev
->bitmap_info
.default_offset
;
5562 mddev
->pers
->quiesce(mddev
, 1);
5563 rv
= bitmap_create(mddev
);
5565 rv
= bitmap_load(mddev
);
5567 bitmap_destroy(mddev
);
5568 mddev
->pers
->quiesce(mddev
, 0);
5570 /* remove the bitmap */
5573 if (mddev
->bitmap
->file
)
5575 mddev
->pers
->quiesce(mddev
, 1);
5576 bitmap_destroy(mddev
);
5577 mddev
->pers
->quiesce(mddev
, 0);
5578 mddev
->bitmap_info
.offset
= 0;
5581 md_update_sb(mddev
, 1);
5585 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5589 if (mddev
->pers
== NULL
)
5592 rdev
= find_rdev(mddev
, dev
);
5596 md_error(mddev
, rdev
);
5601 * We have a problem here : there is no easy way to give a CHS
5602 * virtual geometry. We currently pretend that we have a 2 heads
5603 * 4 sectors (with a BIG number of cylinders...). This drives
5604 * dosfs just mad... ;-)
5606 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5608 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5612 geo
->cylinders
= mddev
->array_sectors
/ 8;
5616 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5617 unsigned int cmd
, unsigned long arg
)
5620 void __user
*argp
= (void __user
*)arg
;
5621 mddev_t
*mddev
= NULL
;
5624 if (!capable(CAP_SYS_ADMIN
))
5628 * Commands dealing with the RAID driver but not any
5634 err
= get_version(argp
);
5637 case PRINT_RAID_DEBUG
:
5645 autostart_arrays(arg
);
5652 * Commands creating/starting a new array:
5655 mddev
= bdev
->bd_disk
->private_data
;
5662 err
= mddev_lock(mddev
);
5665 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5672 case SET_ARRAY_INFO
:
5674 mdu_array_info_t info
;
5676 memset(&info
, 0, sizeof(info
));
5677 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5682 err
= update_array_info(mddev
, &info
);
5684 printk(KERN_WARNING
"md: couldn't update"
5685 " array info. %d\n", err
);
5690 if (!list_empty(&mddev
->disks
)) {
5692 "md: array %s already has disks!\n",
5697 if (mddev
->raid_disks
) {
5699 "md: array %s already initialised!\n",
5704 err
= set_array_info(mddev
, &info
);
5706 printk(KERN_WARNING
"md: couldn't set"
5707 " array info. %d\n", err
);
5717 * Commands querying/configuring an existing array:
5719 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5720 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5721 if ((!mddev
->raid_disks
&& !mddev
->external
)
5722 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5723 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5724 && cmd
!= GET_BITMAP_FILE
) {
5730 * Commands even a read-only array can execute:
5734 case GET_ARRAY_INFO
:
5735 err
= get_array_info(mddev
, argp
);
5738 case GET_BITMAP_FILE
:
5739 err
= get_bitmap_file(mddev
, argp
);
5743 err
= get_disk_info(mddev
, argp
);
5746 case RESTART_ARRAY_RW
:
5747 err
= restart_array(mddev
);
5751 err
= do_md_stop(mddev
, 0, 1);
5755 err
= md_set_readonly(mddev
, 1);
5759 if (get_user(ro
, (int __user
*)(arg
))) {
5765 /* if the bdev is going readonly the value of mddev->ro
5766 * does not matter, no writes are coming
5771 /* are we are already prepared for writes? */
5775 /* transitioning to readauto need only happen for
5776 * arrays that call md_write_start
5779 err
= restart_array(mddev
);
5782 set_disk_ro(mddev
->gendisk
, 0);
5789 * The remaining ioctls are changing the state of the
5790 * superblock, so we do not allow them on read-only arrays.
5791 * However non-MD ioctls (e.g. get-size) will still come through
5792 * here and hit the 'default' below, so only disallow
5793 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5795 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5796 if (mddev
->ro
== 2) {
5798 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5799 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5800 md_wakeup_thread(mddev
->thread
);
5811 mdu_disk_info_t info
;
5812 if (copy_from_user(&info
, argp
, sizeof(info
)))
5815 err
= add_new_disk(mddev
, &info
);
5819 case HOT_REMOVE_DISK
:
5820 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5824 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5827 case SET_DISK_FAULTY
:
5828 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5832 err
= do_md_run(mddev
);
5835 case SET_BITMAP_FILE
:
5836 err
= set_bitmap_file(mddev
, (int)arg
);
5846 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5848 mddev
->hold_active
= 0;
5849 mddev_unlock(mddev
);
5858 #ifdef CONFIG_COMPAT
5859 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5860 unsigned int cmd
, unsigned long arg
)
5863 case HOT_REMOVE_DISK
:
5865 case SET_DISK_FAULTY
:
5866 case SET_BITMAP_FILE
:
5867 /* These take in integer arg, do not convert */
5870 arg
= (unsigned long)compat_ptr(arg
);
5874 return md_ioctl(bdev
, mode
, cmd
, arg
);
5876 #endif /* CONFIG_COMPAT */
5878 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5881 * Succeed if we can lock the mddev, which confirms that
5882 * it isn't being stopped right now.
5884 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5888 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5889 /* we are racing with mddev_put which is discarding this
5893 /* Wait until bdev->bd_disk is definitely gone */
5894 flush_scheduled_work();
5895 /* Then retry the open from the top */
5897 return -ERESTARTSYS
;
5899 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5901 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5905 atomic_inc(&mddev
->openers
);
5906 mutex_unlock(&mddev
->open_mutex
);
5908 check_disk_size_change(mddev
->gendisk
, bdev
);
5914 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5916 mddev_t
*mddev
= disk
->private_data
;
5920 atomic_dec(&mddev
->openers
);
5926 static const struct block_device_operations md_fops
=
5928 .owner
= THIS_MODULE
,
5930 .release
= md_release
,
5932 #ifdef CONFIG_COMPAT
5933 .compat_ioctl
= md_compat_ioctl
,
5935 .getgeo
= md_getgeo
,
5938 static int md_thread(void * arg
)
5940 mdk_thread_t
*thread
= arg
;
5943 * md_thread is a 'system-thread', it's priority should be very
5944 * high. We avoid resource deadlocks individually in each
5945 * raid personality. (RAID5 does preallocation) We also use RR and
5946 * the very same RT priority as kswapd, thus we will never get
5947 * into a priority inversion deadlock.
5949 * we definitely have to have equal or higher priority than
5950 * bdflush, otherwise bdflush will deadlock if there are too
5951 * many dirty RAID5 blocks.
5954 allow_signal(SIGKILL
);
5955 while (!kthread_should_stop()) {
5957 /* We need to wait INTERRUPTIBLE so that
5958 * we don't add to the load-average.
5959 * That means we need to be sure no signals are
5962 if (signal_pending(current
))
5963 flush_signals(current
);
5965 wait_event_interruptible_timeout
5967 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5968 || kthread_should_stop(),
5971 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5973 thread
->run(thread
->mddev
);
5979 void md_wakeup_thread(mdk_thread_t
*thread
)
5982 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5983 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5984 wake_up(&thread
->wqueue
);
5988 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5991 mdk_thread_t
*thread
;
5993 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5997 init_waitqueue_head(&thread
->wqueue
);
6000 thread
->mddev
= mddev
;
6001 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6002 thread
->tsk
= kthread_run(md_thread
, thread
,
6004 mdname(thread
->mddev
),
6005 name
?: mddev
->pers
->name
);
6006 if (IS_ERR(thread
->tsk
)) {
6013 void md_unregister_thread(mdk_thread_t
*thread
)
6017 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6019 kthread_stop(thread
->tsk
);
6023 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6030 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6033 if (mddev
->external
)
6034 set_bit(Blocked
, &rdev
->flags
);
6036 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6038 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6039 __builtin_return_address(0),__builtin_return_address(1),
6040 __builtin_return_address(2),__builtin_return_address(3));
6044 if (!mddev
->pers
->error_handler
)
6046 mddev
->pers
->error_handler(mddev
,rdev
);
6047 if (mddev
->degraded
)
6048 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6049 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6050 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6051 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6052 md_wakeup_thread(mddev
->thread
);
6053 if (mddev
->event_work
.func
)
6054 schedule_work(&mddev
->event_work
);
6055 md_new_event_inintr(mddev
);
6058 /* seq_file implementation /proc/mdstat */
6060 static void status_unused(struct seq_file
*seq
)
6065 seq_printf(seq
, "unused devices: ");
6067 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6068 char b
[BDEVNAME_SIZE
];
6070 seq_printf(seq
, "%s ",
6071 bdevname(rdev
->bdev
,b
));
6074 seq_printf(seq
, "<none>");
6076 seq_printf(seq
, "\n");
6080 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6082 sector_t max_sectors
, resync
, res
;
6083 unsigned long dt
, db
;
6086 unsigned int per_milli
;
6088 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6090 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6091 max_sectors
= mddev
->resync_max_sectors
;
6093 max_sectors
= mddev
->dev_sectors
;
6096 * Should not happen.
6102 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6103 * in a sector_t, and (max_sectors>>scale) will fit in a
6104 * u32, as those are the requirements for sector_div.
6105 * Thus 'scale' must be at least 10
6108 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6109 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6112 res
= (resync
>>scale
)*1000;
6113 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6117 int i
, x
= per_milli
/50, y
= 20-x
;
6118 seq_printf(seq
, "[");
6119 for (i
= 0; i
< x
; i
++)
6120 seq_printf(seq
, "=");
6121 seq_printf(seq
, ">");
6122 for (i
= 0; i
< y
; i
++)
6123 seq_printf(seq
, ".");
6124 seq_printf(seq
, "] ");
6126 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6127 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6129 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6131 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6132 "resync" : "recovery"))),
6133 per_milli
/10, per_milli
% 10,
6134 (unsigned long long) resync
/2,
6135 (unsigned long long) max_sectors
/2);
6138 * dt: time from mark until now
6139 * db: blocks written from mark until now
6140 * rt: remaining time
6142 * rt is a sector_t, so could be 32bit or 64bit.
6143 * So we divide before multiply in case it is 32bit and close
6145 * We scale the divisor (db) by 32 to avoid loosing precision
6146 * near the end of resync when the number of remaining sectors
6148 * We then divide rt by 32 after multiplying by db to compensate.
6149 * The '+1' avoids division by zero if db is very small.
6151 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6153 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6154 - mddev
->resync_mark_cnt
;
6156 rt
= max_sectors
- resync
; /* number of remaining sectors */
6157 sector_div(rt
, db
/32+1);
6161 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6162 ((unsigned long)rt
% 60)/6);
6164 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6167 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6169 struct list_head
*tmp
;
6179 spin_lock(&all_mddevs_lock
);
6180 list_for_each(tmp
,&all_mddevs
)
6182 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6184 spin_unlock(&all_mddevs_lock
);
6187 spin_unlock(&all_mddevs_lock
);
6189 return (void*)2;/* tail */
6193 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6195 struct list_head
*tmp
;
6196 mddev_t
*next_mddev
, *mddev
= v
;
6202 spin_lock(&all_mddevs_lock
);
6204 tmp
= all_mddevs
.next
;
6206 tmp
= mddev
->all_mddevs
.next
;
6207 if (tmp
!= &all_mddevs
)
6208 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6210 next_mddev
= (void*)2;
6213 spin_unlock(&all_mddevs_lock
);
6221 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6225 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6229 struct mdstat_info
{
6233 static int md_seq_show(struct seq_file
*seq
, void *v
)
6238 struct mdstat_info
*mi
= seq
->private;
6239 struct bitmap
*bitmap
;
6241 if (v
== (void*)1) {
6242 struct mdk_personality
*pers
;
6243 seq_printf(seq
, "Personalities : ");
6244 spin_lock(&pers_lock
);
6245 list_for_each_entry(pers
, &pers_list
, list
)
6246 seq_printf(seq
, "[%s] ", pers
->name
);
6248 spin_unlock(&pers_lock
);
6249 seq_printf(seq
, "\n");
6250 mi
->event
= atomic_read(&md_event_count
);
6253 if (v
== (void*)2) {
6258 if (mddev_lock(mddev
) < 0)
6261 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6262 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6263 mddev
->pers
? "" : "in");
6266 seq_printf(seq
, " (read-only)");
6268 seq_printf(seq
, " (auto-read-only)");
6269 seq_printf(seq
, " %s", mddev
->pers
->name
);
6273 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6274 char b
[BDEVNAME_SIZE
];
6275 seq_printf(seq
, " %s[%d]",
6276 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6277 if (test_bit(WriteMostly
, &rdev
->flags
))
6278 seq_printf(seq
, "(W)");
6279 if (test_bit(Faulty
, &rdev
->flags
)) {
6280 seq_printf(seq
, "(F)");
6282 } else if (rdev
->raid_disk
< 0)
6283 seq_printf(seq
, "(S)"); /* spare */
6284 sectors
+= rdev
->sectors
;
6287 if (!list_empty(&mddev
->disks
)) {
6289 seq_printf(seq
, "\n %llu blocks",
6290 (unsigned long long)
6291 mddev
->array_sectors
/ 2);
6293 seq_printf(seq
, "\n %llu blocks",
6294 (unsigned long long)sectors
/ 2);
6296 if (mddev
->persistent
) {
6297 if (mddev
->major_version
!= 0 ||
6298 mddev
->minor_version
!= 90) {
6299 seq_printf(seq
," super %d.%d",
6300 mddev
->major_version
,
6301 mddev
->minor_version
);
6303 } else if (mddev
->external
)
6304 seq_printf(seq
, " super external:%s",
6305 mddev
->metadata_type
);
6307 seq_printf(seq
, " super non-persistent");
6310 mddev
->pers
->status(seq
, mddev
);
6311 seq_printf(seq
, "\n ");
6312 if (mddev
->pers
->sync_request
) {
6313 if (mddev
->curr_resync
> 2) {
6314 status_resync(seq
, mddev
);
6315 seq_printf(seq
, "\n ");
6316 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6317 seq_printf(seq
, "\tresync=DELAYED\n ");
6318 else if (mddev
->recovery_cp
< MaxSector
)
6319 seq_printf(seq
, "\tresync=PENDING\n ");
6322 seq_printf(seq
, "\n ");
6324 if ((bitmap
= mddev
->bitmap
)) {
6325 unsigned long chunk_kb
;
6326 unsigned long flags
;
6327 spin_lock_irqsave(&bitmap
->lock
, flags
);
6328 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6329 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6331 bitmap
->pages
- bitmap
->missing_pages
,
6333 (bitmap
->pages
- bitmap
->missing_pages
)
6334 << (PAGE_SHIFT
- 10),
6335 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6336 chunk_kb
? "KB" : "B");
6338 seq_printf(seq
, ", file: ");
6339 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6342 seq_printf(seq
, "\n");
6343 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6346 seq_printf(seq
, "\n");
6348 mddev_unlock(mddev
);
6353 static const struct seq_operations md_seq_ops
= {
6354 .start
= md_seq_start
,
6355 .next
= md_seq_next
,
6356 .stop
= md_seq_stop
,
6357 .show
= md_seq_show
,
6360 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6363 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6367 error
= seq_open(file
, &md_seq_ops
);
6371 struct seq_file
*p
= file
->private_data
;
6373 mi
->event
= atomic_read(&md_event_count
);
6378 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6380 struct seq_file
*m
= filp
->private_data
;
6381 struct mdstat_info
*mi
= m
->private;
6384 poll_wait(filp
, &md_event_waiters
, wait
);
6386 /* always allow read */
6387 mask
= POLLIN
| POLLRDNORM
;
6389 if (mi
->event
!= atomic_read(&md_event_count
))
6390 mask
|= POLLERR
| POLLPRI
;
6394 static const struct file_operations md_seq_fops
= {
6395 .owner
= THIS_MODULE
,
6396 .open
= md_seq_open
,
6398 .llseek
= seq_lseek
,
6399 .release
= seq_release_private
,
6400 .poll
= mdstat_poll
,
6403 int register_md_personality(struct mdk_personality
*p
)
6405 spin_lock(&pers_lock
);
6406 list_add_tail(&p
->list
, &pers_list
);
6407 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6408 spin_unlock(&pers_lock
);
6412 int unregister_md_personality(struct mdk_personality
*p
)
6414 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6415 spin_lock(&pers_lock
);
6416 list_del_init(&p
->list
);
6417 spin_unlock(&pers_lock
);
6421 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6429 rdev_for_each_rcu(rdev
, mddev
) {
6430 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6431 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6432 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6433 atomic_read(&disk
->sync_io
);
6434 /* sync IO will cause sync_io to increase before the disk_stats
6435 * as sync_io is counted when a request starts, and
6436 * disk_stats is counted when it completes.
6437 * So resync activity will cause curr_events to be smaller than
6438 * when there was no such activity.
6439 * non-sync IO will cause disk_stat to increase without
6440 * increasing sync_io so curr_events will (eventually)
6441 * be larger than it was before. Once it becomes
6442 * substantially larger, the test below will cause
6443 * the array to appear non-idle, and resync will slow
6445 * If there is a lot of outstanding resync activity when
6446 * we set last_event to curr_events, then all that activity
6447 * completing might cause the array to appear non-idle
6448 * and resync will be slowed down even though there might
6449 * not have been non-resync activity. This will only
6450 * happen once though. 'last_events' will soon reflect
6451 * the state where there is little or no outstanding
6452 * resync requests, and further resync activity will
6453 * always make curr_events less than last_events.
6456 if (init
|| curr_events
- rdev
->last_events
> 64) {
6457 rdev
->last_events
= curr_events
;
6465 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6467 /* another "blocks" (512byte) blocks have been synced */
6468 atomic_sub(blocks
, &mddev
->recovery_active
);
6469 wake_up(&mddev
->recovery_wait
);
6471 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6472 md_wakeup_thread(mddev
->thread
);
6473 // stop recovery, signal do_sync ....
6478 /* md_write_start(mddev, bi)
6479 * If we need to update some array metadata (e.g. 'active' flag
6480 * in superblock) before writing, schedule a superblock update
6481 * and wait for it to complete.
6483 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6486 if (bio_data_dir(bi
) != WRITE
)
6489 BUG_ON(mddev
->ro
== 1);
6490 if (mddev
->ro
== 2) {
6491 /* need to switch to read/write */
6493 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6494 md_wakeup_thread(mddev
->thread
);
6495 md_wakeup_thread(mddev
->sync_thread
);
6498 atomic_inc(&mddev
->writes_pending
);
6499 if (mddev
->safemode
== 1)
6500 mddev
->safemode
= 0;
6501 if (mddev
->in_sync
) {
6502 spin_lock_irq(&mddev
->write_lock
);
6503 if (mddev
->in_sync
) {
6505 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6506 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6507 md_wakeup_thread(mddev
->thread
);
6510 spin_unlock_irq(&mddev
->write_lock
);
6513 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6514 wait_event(mddev
->sb_wait
,
6515 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6518 void md_write_end(mddev_t
*mddev
)
6520 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6521 if (mddev
->safemode
== 2)
6522 md_wakeup_thread(mddev
->thread
);
6523 else if (mddev
->safemode_delay
)
6524 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6528 /* md_allow_write(mddev)
6529 * Calling this ensures that the array is marked 'active' so that writes
6530 * may proceed without blocking. It is important to call this before
6531 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6532 * Must be called with mddev_lock held.
6534 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6535 * is dropped, so return -EAGAIN after notifying userspace.
6537 int md_allow_write(mddev_t
*mddev
)
6543 if (!mddev
->pers
->sync_request
)
6546 spin_lock_irq(&mddev
->write_lock
);
6547 if (mddev
->in_sync
) {
6549 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6550 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6551 if (mddev
->safemode_delay
&&
6552 mddev
->safemode
== 0)
6553 mddev
->safemode
= 1;
6554 spin_unlock_irq(&mddev
->write_lock
);
6555 md_update_sb(mddev
, 0);
6556 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6558 spin_unlock_irq(&mddev
->write_lock
);
6560 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6565 EXPORT_SYMBOL_GPL(md_allow_write
);
6567 void md_unplug(mddev_t
*mddev
)
6570 blk_unplug(mddev
->queue
);
6572 mddev
->plug
->unplug_fn(mddev
->plug
);
6575 #define SYNC_MARKS 10
6576 #define SYNC_MARK_STEP (3*HZ)
6577 void md_do_sync(mddev_t
*mddev
)
6580 unsigned int currspeed
= 0,
6582 sector_t max_sectors
,j
, io_sectors
;
6583 unsigned long mark
[SYNC_MARKS
];
6584 sector_t mark_cnt
[SYNC_MARKS
];
6586 struct list_head
*tmp
;
6587 sector_t last_check
;
6592 /* just incase thread restarts... */
6593 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6595 if (mddev
->ro
) /* never try to sync a read-only array */
6598 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6599 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6600 desc
= "data-check";
6601 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6602 desc
= "requested-resync";
6605 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6610 /* we overload curr_resync somewhat here.
6611 * 0 == not engaged in resync at all
6612 * 2 == checking that there is no conflict with another sync
6613 * 1 == like 2, but have yielded to allow conflicting resync to
6615 * other == active in resync - this many blocks
6617 * Before starting a resync we must have set curr_resync to
6618 * 2, and then checked that every "conflicting" array has curr_resync
6619 * less than ours. When we find one that is the same or higher
6620 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6621 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6622 * This will mean we have to start checking from the beginning again.
6627 mddev
->curr_resync
= 2;
6630 if (kthread_should_stop())
6631 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6633 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6635 for_each_mddev(mddev2
, tmp
) {
6636 if (mddev2
== mddev
)
6638 if (!mddev
->parallel_resync
6639 && mddev2
->curr_resync
6640 && match_mddev_units(mddev
, mddev2
)) {
6642 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6643 /* arbitrarily yield */
6644 mddev
->curr_resync
= 1;
6645 wake_up(&resync_wait
);
6647 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6648 /* no need to wait here, we can wait the next
6649 * time 'round when curr_resync == 2
6652 /* We need to wait 'interruptible' so as not to
6653 * contribute to the load average, and not to
6654 * be caught by 'softlockup'
6656 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6657 if (!kthread_should_stop() &&
6658 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6659 printk(KERN_INFO
"md: delaying %s of %s"
6660 " until %s has finished (they"
6661 " share one or more physical units)\n",
6662 desc
, mdname(mddev
), mdname(mddev2
));
6664 if (signal_pending(current
))
6665 flush_signals(current
);
6667 finish_wait(&resync_wait
, &wq
);
6670 finish_wait(&resync_wait
, &wq
);
6673 } while (mddev
->curr_resync
< 2);
6676 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6677 /* resync follows the size requested by the personality,
6678 * which defaults to physical size, but can be virtual size
6680 max_sectors
= mddev
->resync_max_sectors
;
6681 mddev
->resync_mismatches
= 0;
6682 /* we don't use the checkpoint if there's a bitmap */
6683 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6684 j
= mddev
->resync_min
;
6685 else if (!mddev
->bitmap
)
6686 j
= mddev
->recovery_cp
;
6688 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6689 max_sectors
= mddev
->dev_sectors
;
6691 /* recovery follows the physical size of devices */
6692 max_sectors
= mddev
->dev_sectors
;
6695 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6696 if (rdev
->raid_disk
>= 0 &&
6697 !test_bit(Faulty
, &rdev
->flags
) &&
6698 !test_bit(In_sync
, &rdev
->flags
) &&
6699 rdev
->recovery_offset
< j
)
6700 j
= rdev
->recovery_offset
;
6704 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6705 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6706 " %d KB/sec/disk.\n", speed_min(mddev
));
6707 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6708 "(but not more than %d KB/sec) for %s.\n",
6709 speed_max(mddev
), desc
);
6711 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6714 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6716 mark_cnt
[m
] = io_sectors
;
6719 mddev
->resync_mark
= mark
[last_mark
];
6720 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6723 * Tune reconstruction:
6725 window
= 32*(PAGE_SIZE
/512);
6726 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6727 window
/2,(unsigned long long) max_sectors
/2);
6729 atomic_set(&mddev
->recovery_active
, 0);
6734 "md: resuming %s of %s from checkpoint.\n",
6735 desc
, mdname(mddev
));
6736 mddev
->curr_resync
= j
;
6738 mddev
->curr_resync_completed
= mddev
->curr_resync
;
6740 while (j
< max_sectors
) {
6745 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6746 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6747 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6748 > (max_sectors
>> 4)) ||
6749 (j
- mddev
->curr_resync_completed
)*2
6750 >= mddev
->resync_max
- mddev
->curr_resync_completed
6752 /* time to update curr_resync_completed */
6754 wait_event(mddev
->recovery_wait
,
6755 atomic_read(&mddev
->recovery_active
) == 0);
6756 mddev
->curr_resync_completed
=
6758 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6759 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6762 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6763 /* As this condition is controlled by user-space,
6764 * we can block indefinitely, so use '_interruptible'
6765 * to avoid triggering warnings.
6767 flush_signals(current
); /* just in case */
6768 wait_event_interruptible(mddev
->recovery_wait
,
6769 mddev
->resync_max
> j
6770 || kthread_should_stop());
6773 if (kthread_should_stop())
6776 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6777 currspeed
< speed_min(mddev
));
6779 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6783 if (!skipped
) { /* actual IO requested */
6784 io_sectors
+= sectors
;
6785 atomic_add(sectors
, &mddev
->recovery_active
);
6789 if (j
>1) mddev
->curr_resync
= j
;
6790 mddev
->curr_mark_cnt
= io_sectors
;
6791 if (last_check
== 0)
6792 /* this is the earliers that rebuilt will be
6793 * visible in /proc/mdstat
6795 md_new_event(mddev
);
6797 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6800 last_check
= io_sectors
;
6802 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6806 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6808 int next
= (last_mark
+1) % SYNC_MARKS
;
6810 mddev
->resync_mark
= mark
[next
];
6811 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6812 mark
[next
] = jiffies
;
6813 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6818 if (kthread_should_stop())
6823 * this loop exits only if either when we are slower than
6824 * the 'hard' speed limit, or the system was IO-idle for
6826 * the system might be non-idle CPU-wise, but we only care
6827 * about not overloading the IO subsystem. (things like an
6828 * e2fsck being done on the RAID array should execute fast)
6833 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6834 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6836 if (currspeed
> speed_min(mddev
)) {
6837 if ((currspeed
> speed_max(mddev
)) ||
6838 !is_mddev_idle(mddev
, 0)) {
6844 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6846 * this also signals 'finished resyncing' to md_stop
6851 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6853 /* tell personality that we are finished */
6854 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6856 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6857 mddev
->curr_resync
> 2) {
6858 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6859 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6860 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6862 "md: checkpointing %s of %s.\n",
6863 desc
, mdname(mddev
));
6864 mddev
->recovery_cp
= mddev
->curr_resync
;
6867 mddev
->recovery_cp
= MaxSector
;
6869 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6870 mddev
->curr_resync
= MaxSector
;
6872 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6873 if (rdev
->raid_disk
>= 0 &&
6874 mddev
->delta_disks
>= 0 &&
6875 !test_bit(Faulty
, &rdev
->flags
) &&
6876 !test_bit(In_sync
, &rdev
->flags
) &&
6877 rdev
->recovery_offset
< mddev
->curr_resync
)
6878 rdev
->recovery_offset
= mddev
->curr_resync
;
6882 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6885 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6886 /* We completed so min/max setting can be forgotten if used. */
6887 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6888 mddev
->resync_min
= 0;
6889 mddev
->resync_max
= MaxSector
;
6890 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6891 mddev
->resync_min
= mddev
->curr_resync_completed
;
6892 mddev
->curr_resync
= 0;
6893 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6894 mddev
->curr_resync_completed
= 0;
6895 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6896 wake_up(&resync_wait
);
6897 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6898 md_wakeup_thread(mddev
->thread
);
6903 * got a signal, exit.
6906 "md: md_do_sync() got signal ... exiting\n");
6907 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6911 EXPORT_SYMBOL_GPL(md_do_sync
);
6914 static int remove_and_add_spares(mddev_t
*mddev
)
6919 mddev
->curr_resync_completed
= 0;
6921 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6922 if (rdev
->raid_disk
>= 0 &&
6923 !test_bit(Blocked
, &rdev
->flags
) &&
6924 (test_bit(Faulty
, &rdev
->flags
) ||
6925 ! test_bit(In_sync
, &rdev
->flags
)) &&
6926 atomic_read(&rdev
->nr_pending
)==0) {
6927 if (mddev
->pers
->hot_remove_disk(
6928 mddev
, rdev
->raid_disk
)==0) {
6930 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6931 sysfs_remove_link(&mddev
->kobj
, nm
);
6932 rdev
->raid_disk
= -1;
6936 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6937 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6938 if (rdev
->raid_disk
>= 0 &&
6939 !test_bit(In_sync
, &rdev
->flags
) &&
6940 !test_bit(Blocked
, &rdev
->flags
))
6942 if (rdev
->raid_disk
< 0
6943 && !test_bit(Faulty
, &rdev
->flags
)) {
6944 rdev
->recovery_offset
= 0;
6946 hot_add_disk(mddev
, rdev
) == 0) {
6948 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6949 if (sysfs_create_link(&mddev
->kobj
,
6951 /* failure here is OK */;
6953 md_new_event(mddev
);
6954 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6963 * This routine is regularly called by all per-raid-array threads to
6964 * deal with generic issues like resync and super-block update.
6965 * Raid personalities that don't have a thread (linear/raid0) do not
6966 * need this as they never do any recovery or update the superblock.
6968 * It does not do any resync itself, but rather "forks" off other threads
6969 * to do that as needed.
6970 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6971 * "->recovery" and create a thread at ->sync_thread.
6972 * When the thread finishes it sets MD_RECOVERY_DONE
6973 * and wakeups up this thread which will reap the thread and finish up.
6974 * This thread also removes any faulty devices (with nr_pending == 0).
6976 * The overall approach is:
6977 * 1/ if the superblock needs updating, update it.
6978 * 2/ If a recovery thread is running, don't do anything else.
6979 * 3/ If recovery has finished, clean up, possibly marking spares active.
6980 * 4/ If there are any faulty devices, remove them.
6981 * 5/ If array is degraded, try to add spares devices
6982 * 6/ If array has spares or is not in-sync, start a resync thread.
6984 void md_check_recovery(mddev_t
*mddev
)
6990 bitmap_daemon_work(mddev
);
6995 if (signal_pending(current
)) {
6996 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6997 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6999 mddev
->safemode
= 2;
7001 flush_signals(current
);
7004 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7007 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7008 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7009 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7010 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7011 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7012 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7016 if (mddev_trylock(mddev
)) {
7020 /* Only thing we do on a ro array is remove
7023 remove_and_add_spares(mddev
);
7024 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7028 if (!mddev
->external
) {
7030 spin_lock_irq(&mddev
->write_lock
);
7031 if (mddev
->safemode
&&
7032 !atomic_read(&mddev
->writes_pending
) &&
7034 mddev
->recovery_cp
== MaxSector
) {
7037 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7039 if (mddev
->safemode
== 1)
7040 mddev
->safemode
= 0;
7041 spin_unlock_irq(&mddev
->write_lock
);
7043 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7047 md_update_sb(mddev
, 0);
7049 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7050 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7051 /* resync/recovery still happening */
7052 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7055 if (mddev
->sync_thread
) {
7056 /* resync has finished, collect result */
7057 md_unregister_thread(mddev
->sync_thread
);
7058 mddev
->sync_thread
= NULL
;
7059 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7060 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7062 /* activate any spares */
7063 if (mddev
->pers
->spare_active(mddev
))
7064 sysfs_notify(&mddev
->kobj
, NULL
,
7067 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7068 mddev
->pers
->finish_reshape
)
7069 mddev
->pers
->finish_reshape(mddev
);
7070 md_update_sb(mddev
, 1);
7072 /* if array is no-longer degraded, then any saved_raid_disk
7073 * information must be scrapped
7075 if (!mddev
->degraded
)
7076 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7077 rdev
->saved_raid_disk
= -1;
7079 mddev
->recovery
= 0;
7080 /* flag recovery needed just to double check */
7081 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7082 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7083 md_new_event(mddev
);
7086 /* Set RUNNING before clearing NEEDED to avoid
7087 * any transients in the value of "sync_action".
7089 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7090 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7091 /* Clear some bits that don't mean anything, but
7094 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7095 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7097 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7099 /* no recovery is running.
7100 * remove any failed drives, then
7101 * add spares if possible.
7102 * Spare are also removed and re-added, to allow
7103 * the personality to fail the re-add.
7106 if (mddev
->reshape_position
!= MaxSector
) {
7107 if (mddev
->pers
->check_reshape
== NULL
||
7108 mddev
->pers
->check_reshape(mddev
) != 0)
7109 /* Cannot proceed */
7111 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7112 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7113 } else if ((spares
= remove_and_add_spares(mddev
))) {
7114 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7115 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7116 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7117 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7118 } else if (mddev
->recovery_cp
< MaxSector
) {
7119 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7120 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7121 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7122 /* nothing to be done ... */
7125 if (mddev
->pers
->sync_request
) {
7126 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7127 /* We are adding a device or devices to an array
7128 * which has the bitmap stored on all devices.
7129 * So make sure all bitmap pages get written
7131 bitmap_write_all(mddev
->bitmap
);
7133 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7136 if (!mddev
->sync_thread
) {
7137 printk(KERN_ERR
"%s: could not start resync"
7140 /* leave the spares where they are, it shouldn't hurt */
7141 mddev
->recovery
= 0;
7143 md_wakeup_thread(mddev
->sync_thread
);
7144 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7145 md_new_event(mddev
);
7148 if (!mddev
->sync_thread
) {
7149 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7150 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7152 if (mddev
->sysfs_action
)
7153 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7155 mddev_unlock(mddev
);
7159 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7161 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7162 wait_event_timeout(rdev
->blocked_wait
,
7163 !test_bit(Blocked
, &rdev
->flags
),
7164 msecs_to_jiffies(5000));
7165 rdev_dec_pending(rdev
, mddev
);
7167 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7169 static int md_notify_reboot(struct notifier_block
*this,
7170 unsigned long code
, void *x
)
7172 struct list_head
*tmp
;
7175 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7177 printk(KERN_INFO
"md: stopping all md devices.\n");
7179 for_each_mddev(mddev
, tmp
)
7180 if (mddev_trylock(mddev
)) {
7181 /* Force a switch to readonly even array
7182 * appears to still be in use. Hence
7185 md_set_readonly(mddev
, 100);
7186 mddev_unlock(mddev
);
7189 * certain more exotic SCSI devices are known to be
7190 * volatile wrt too early system reboots. While the
7191 * right place to handle this issue is the given
7192 * driver, we do want to have a safe RAID driver ...
7199 static struct notifier_block md_notifier
= {
7200 .notifier_call
= md_notify_reboot
,
7202 .priority
= INT_MAX
, /* before any real devices */
7205 static void md_geninit(void)
7207 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7209 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7212 static int __init
md_init(void)
7214 if (register_blkdev(MD_MAJOR
, "md"))
7216 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
7217 unregister_blkdev(MD_MAJOR
, "md");
7220 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7221 md_probe
, NULL
, NULL
);
7222 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7223 md_probe
, NULL
, NULL
);
7225 register_reboot_notifier(&md_notifier
);
7226 raid_table_header
= register_sysctl_table(raid_root_table
);
7236 * Searches all registered partitions for autorun RAID arrays
7240 static LIST_HEAD(all_detected_devices
);
7241 struct detected_devices_node
{
7242 struct list_head list
;
7246 void md_autodetect_dev(dev_t dev
)
7248 struct detected_devices_node
*node_detected_dev
;
7250 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7251 if (node_detected_dev
) {
7252 node_detected_dev
->dev
= dev
;
7253 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7255 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7256 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7261 static void autostart_arrays(int part
)
7264 struct detected_devices_node
*node_detected_dev
;
7266 int i_scanned
, i_passed
;
7271 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7273 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7275 node_detected_dev
= list_entry(all_detected_devices
.next
,
7276 struct detected_devices_node
, list
);
7277 list_del(&node_detected_dev
->list
);
7278 dev
= node_detected_dev
->dev
;
7279 kfree(node_detected_dev
);
7280 rdev
= md_import_device(dev
,0, 90);
7284 if (test_bit(Faulty
, &rdev
->flags
)) {
7288 set_bit(AutoDetected
, &rdev
->flags
);
7289 list_add(&rdev
->same_set
, &pending_raid_disks
);
7293 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7294 i_scanned
, i_passed
);
7296 autorun_devices(part
);
7299 #endif /* !MODULE */
7301 static __exit
void md_exit(void)
7304 struct list_head
*tmp
;
7306 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7307 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7309 unregister_blkdev(MD_MAJOR
,"md");
7310 unregister_blkdev(mdp_major
, "mdp");
7311 unregister_reboot_notifier(&md_notifier
);
7312 unregister_sysctl_table(raid_table_header
);
7313 remove_proc_entry("mdstat", NULL
);
7314 for_each_mddev(mddev
, tmp
) {
7315 export_array(mddev
);
7316 mddev
->hold_active
= 0;
7320 subsys_initcall(md_init
);
7321 module_exit(md_exit
)
7323 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7325 return sprintf(buffer
, "%d", start_readonly
);
7327 static int set_ro(const char *val
, struct kernel_param
*kp
)
7330 int num
= simple_strtoul(val
, &e
, 10);
7331 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7332 start_readonly
= num
;
7338 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7339 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7341 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7343 EXPORT_SYMBOL(register_md_personality
);
7344 EXPORT_SYMBOL(unregister_md_personality
);
7345 EXPORT_SYMBOL(md_error
);
7346 EXPORT_SYMBOL(md_done_sync
);
7347 EXPORT_SYMBOL(md_write_start
);
7348 EXPORT_SYMBOL(md_write_end
);
7349 EXPORT_SYMBOL(md_register_thread
);
7350 EXPORT_SYMBOL(md_unregister_thread
);
7351 EXPORT_SYMBOL(md_wakeup_thread
);
7352 EXPORT_SYMBOL(md_check_recovery
);
7353 MODULE_LICENSE("GPL");
7354 MODULE_DESCRIPTION("MD RAID framework");
7356 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);