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/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/reboot.h>
47 #include <linux/file.h>
48 #include <linux/compat.h>
49 #include <linux/delay.h>
50 #include <linux/raid/md_p.h>
51 #include <linux/raid/md_u.h>
52 #include <linux/slab.h>
57 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part
);
64 static LIST_HEAD(pers_list
);
65 static DEFINE_SPINLOCK(pers_lock
);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
71 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
74 * Default number of read corrections we'll attempt on an rdev
75 * before ejecting it from the array. We divide the read error
76 * count by 2 for every hour elapsed between read errors.
78 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min
= 1000;
93 static int sysctl_speed_limit_max
= 200000;
94 static inline int speed_min(mddev_t
*mddev
)
96 return mddev
->sync_speed_min
?
97 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
100 static inline int speed_max(mddev_t
*mddev
)
102 return mddev
->sync_speed_max
?
103 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
106 static struct ctl_table_header
*raid_table_header
;
108 static ctl_table raid_table
[] = {
110 .procname
= "speed_limit_min",
111 .data
= &sysctl_speed_limit_min
,
112 .maxlen
= sizeof(int),
113 .mode
= S_IRUGO
|S_IWUSR
,
114 .proc_handler
= proc_dointvec
,
117 .procname
= "speed_limit_max",
118 .data
= &sysctl_speed_limit_max
,
119 .maxlen
= sizeof(int),
120 .mode
= S_IRUGO
|S_IWUSR
,
121 .proc_handler
= proc_dointvec
,
126 static ctl_table raid_dir_table
[] = {
130 .mode
= S_IRUGO
|S_IXUGO
,
136 static ctl_table raid_root_table
[] = {
141 .child
= raid_dir_table
,
146 static const struct block_device_operations md_fops
;
148 static int start_readonly
;
151 * We have a system wide 'event count' that is incremented
152 * on any 'interesting' event, and readers of /proc/mdstat
153 * can use 'poll' or 'select' to find out when the event
157 * start array, stop array, error, add device, remove device,
158 * start build, activate spare
160 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
161 static atomic_t md_event_count
;
162 void md_new_event(mddev_t
*mddev
)
164 atomic_inc(&md_event_count
);
165 wake_up(&md_event_waiters
);
167 EXPORT_SYMBOL_GPL(md_new_event
);
169 /* Alternate version that can be called from interrupts
170 * when calling sysfs_notify isn't needed.
172 static void md_new_event_inintr(mddev_t
*mddev
)
174 atomic_inc(&md_event_count
);
175 wake_up(&md_event_waiters
);
179 * Enables to iterate over all existing md arrays
180 * all_mddevs_lock protects this list.
182 static LIST_HEAD(all_mddevs
);
183 static DEFINE_SPINLOCK(all_mddevs_lock
);
187 * iterates through all used mddevs in the system.
188 * We take care to grab the all_mddevs_lock whenever navigating
189 * the list, and to always hold a refcount when unlocked.
190 * Any code which breaks out of this loop while own
191 * a reference to the current mddev and must mddev_put it.
193 #define for_each_mddev(mddev,tmp) \
195 for (({ spin_lock(&all_mddevs_lock); \
196 tmp = all_mddevs.next; \
198 ({ if (tmp != &all_mddevs) \
199 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
200 spin_unlock(&all_mddevs_lock); \
201 if (mddev) mddev_put(mddev); \
202 mddev = list_entry(tmp, mddev_t, all_mddevs); \
203 tmp != &all_mddevs;}); \
204 ({ spin_lock(&all_mddevs_lock); \
209 /* Rather than calling directly into the personality make_request function,
210 * IO requests come here first so that we can check if the device is
211 * being suspended pending a reconfiguration.
212 * We hold a refcount over the call to ->make_request. By the time that
213 * call has finished, the bio has been linked into some internal structure
214 * and so is visible to ->quiesce(), so we don't need the refcount any more.
216 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
218 const int rw
= bio_data_dir(bio
);
219 mddev_t
*mddev
= q
->queuedata
;
223 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
228 if (mddev
->suspended
|| mddev
->barrier
) {
231 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
232 TASK_UNINTERRUPTIBLE
);
233 if (!mddev
->suspended
&& !mddev
->barrier
)
239 finish_wait(&mddev
->sb_wait
, &__wait
);
241 atomic_inc(&mddev
->active_io
);
244 rv
= mddev
->pers
->make_request(mddev
, bio
);
246 cpu
= part_stat_lock();
247 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
248 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
],
252 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
253 wake_up(&mddev
->sb_wait
);
258 /* mddev_suspend makes sure no new requests are submitted
259 * to the device, and that any requests that have been submitted
260 * are completely handled.
261 * Once ->stop is called and completes, the module will be completely
264 void mddev_suspend(mddev_t
*mddev
)
266 BUG_ON(mddev
->suspended
);
267 mddev
->suspended
= 1;
269 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
270 mddev
->pers
->quiesce(mddev
, 1);
272 EXPORT_SYMBOL_GPL(mddev_suspend
);
274 void mddev_resume(mddev_t
*mddev
)
276 mddev
->suspended
= 0;
277 wake_up(&mddev
->sb_wait
);
278 mddev
->pers
->quiesce(mddev
, 0);
280 EXPORT_SYMBOL_GPL(mddev_resume
);
282 int mddev_congested(mddev_t
*mddev
, int bits
)
286 return mddev
->suspended
;
288 EXPORT_SYMBOL(mddev_congested
);
291 * Generic barrier handling for md
294 #define POST_REQUEST_BARRIER ((void*)1)
296 static void md_end_barrier(struct bio
*bio
, int err
)
298 mdk_rdev_t
*rdev
= bio
->bi_private
;
299 mddev_t
*mddev
= rdev
->mddev
;
300 if (err
== -EOPNOTSUPP
&& mddev
->barrier
!= POST_REQUEST_BARRIER
)
301 set_bit(BIO_EOPNOTSUPP
, &mddev
->barrier
->bi_flags
);
303 rdev_dec_pending(rdev
, mddev
);
305 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
306 if (mddev
->barrier
== POST_REQUEST_BARRIER
) {
307 /* This was a post-request barrier */
308 mddev
->barrier
= NULL
;
309 wake_up(&mddev
->sb_wait
);
311 /* The pre-request barrier has finished */
312 schedule_work(&mddev
->barrier_work
);
317 static void submit_barriers(mddev_t
*mddev
)
322 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
323 if (rdev
->raid_disk
>= 0 &&
324 !test_bit(Faulty
, &rdev
->flags
)) {
325 /* Take two references, one is dropped
326 * when request finishes, one after
327 * we reclaim rcu_read_lock
330 atomic_inc(&rdev
->nr_pending
);
331 atomic_inc(&rdev
->nr_pending
);
333 bi
= bio_alloc(GFP_KERNEL
, 0);
334 bi
->bi_end_io
= md_end_barrier
;
335 bi
->bi_private
= rdev
;
336 bi
->bi_bdev
= rdev
->bdev
;
337 atomic_inc(&mddev
->flush_pending
);
338 submit_bio(WRITE_BARRIER
, bi
);
340 rdev_dec_pending(rdev
, mddev
);
345 static void md_submit_barrier(struct work_struct
*ws
)
347 mddev_t
*mddev
= container_of(ws
, mddev_t
, barrier_work
);
348 struct bio
*bio
= mddev
->barrier
;
350 atomic_set(&mddev
->flush_pending
, 1);
352 if (test_bit(BIO_EOPNOTSUPP
, &bio
->bi_flags
))
353 bio_endio(bio
, -EOPNOTSUPP
);
354 else if (bio
->bi_size
== 0)
355 /* an empty barrier - all done */
358 bio
->bi_rw
&= ~(1<<BIO_RW_BARRIER
);
359 if (mddev
->pers
->make_request(mddev
, bio
))
360 generic_make_request(bio
);
361 mddev
->barrier
= POST_REQUEST_BARRIER
;
362 submit_barriers(mddev
);
364 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
365 mddev
->barrier
= NULL
;
366 wake_up(&mddev
->sb_wait
);
370 void md_barrier_request(mddev_t
*mddev
, struct bio
*bio
)
372 spin_lock_irq(&mddev
->write_lock
);
373 wait_event_lock_irq(mddev
->sb_wait
,
375 mddev
->write_lock
, /*nothing*/);
376 mddev
->barrier
= bio
;
377 spin_unlock_irq(&mddev
->write_lock
);
379 atomic_set(&mddev
->flush_pending
, 1);
380 INIT_WORK(&mddev
->barrier_work
, md_submit_barrier
);
382 submit_barriers(mddev
);
384 if (atomic_dec_and_test(&mddev
->flush_pending
))
385 schedule_work(&mddev
->barrier_work
);
387 EXPORT_SYMBOL(md_barrier_request
);
389 /* Support for plugging.
390 * This mirrors the plugging support in request_queue, but does not
391 * require having a whole queue
393 static void plugger_work(struct work_struct
*work
)
395 struct plug_handle
*plug
=
396 container_of(work
, struct plug_handle
, unplug_work
);
397 plug
->unplug_fn(plug
);
399 static void plugger_timeout(unsigned long data
)
401 struct plug_handle
*plug
= (void *)data
;
402 kblockd_schedule_work(NULL
, &plug
->unplug_work
);
404 void plugger_init(struct plug_handle
*plug
,
405 void (*unplug_fn
)(struct plug_handle
*))
407 plug
->unplug_flag
= 0;
408 plug
->unplug_fn
= unplug_fn
;
409 init_timer(&plug
->unplug_timer
);
410 plug
->unplug_timer
.function
= plugger_timeout
;
411 plug
->unplug_timer
.data
= (unsigned long)plug
;
412 INIT_WORK(&plug
->unplug_work
, plugger_work
);
414 EXPORT_SYMBOL_GPL(plugger_init
);
416 void plugger_set_plug(struct plug_handle
*plug
)
418 if (!test_and_set_bit(PLUGGED_FLAG
, &plug
->unplug_flag
))
419 mod_timer(&plug
->unplug_timer
, jiffies
+ msecs_to_jiffies(3)+1);
421 EXPORT_SYMBOL_GPL(plugger_set_plug
);
423 int plugger_remove_plug(struct plug_handle
*plug
)
425 if (test_and_clear_bit(PLUGGED_FLAG
, &plug
->unplug_flag
)) {
426 del_timer(&plug
->unplug_timer
);
431 EXPORT_SYMBOL_GPL(plugger_remove_plug
);
434 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
436 atomic_inc(&mddev
->active
);
440 static void mddev_delayed_delete(struct work_struct
*ws
);
442 static void mddev_put(mddev_t
*mddev
)
444 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
446 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
447 mddev
->ctime
== 0 && !mddev
->hold_active
) {
448 /* Array is not configured at all, and not held active,
450 list_del(&mddev
->all_mddevs
);
451 if (mddev
->gendisk
) {
452 /* we did a probe so need to clean up.
453 * Call schedule_work inside the spinlock
454 * so that flush_scheduled_work() after
455 * mddev_find will succeed in waiting for the
458 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
459 schedule_work(&mddev
->del_work
);
463 spin_unlock(&all_mddevs_lock
);
466 void mddev_init(mddev_t
*mddev
)
468 mutex_init(&mddev
->open_mutex
);
469 mutex_init(&mddev
->reconfig_mutex
);
470 mutex_init(&mddev
->bitmap_info
.mutex
);
471 INIT_LIST_HEAD(&mddev
->disks
);
472 INIT_LIST_HEAD(&mddev
->all_mddevs
);
473 init_timer(&mddev
->safemode_timer
);
474 atomic_set(&mddev
->active
, 1);
475 atomic_set(&mddev
->openers
, 0);
476 atomic_set(&mddev
->active_io
, 0);
477 spin_lock_init(&mddev
->write_lock
);
478 atomic_set(&mddev
->flush_pending
, 0);
479 init_waitqueue_head(&mddev
->sb_wait
);
480 init_waitqueue_head(&mddev
->recovery_wait
);
481 mddev
->reshape_position
= MaxSector
;
482 mddev
->resync_min
= 0;
483 mddev
->resync_max
= MaxSector
;
484 mddev
->level
= LEVEL_NONE
;
486 EXPORT_SYMBOL_GPL(mddev_init
);
488 static mddev_t
* mddev_find(dev_t unit
)
490 mddev_t
*mddev
, *new = NULL
;
493 spin_lock(&all_mddevs_lock
);
496 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
497 if (mddev
->unit
== unit
) {
499 spin_unlock(&all_mddevs_lock
);
505 list_add(&new->all_mddevs
, &all_mddevs
);
506 spin_unlock(&all_mddevs_lock
);
507 new->hold_active
= UNTIL_IOCTL
;
511 /* find an unused unit number */
512 static int next_minor
= 512;
513 int start
= next_minor
;
517 dev
= MKDEV(MD_MAJOR
, next_minor
);
519 if (next_minor
> MINORMASK
)
521 if (next_minor
== start
) {
522 /* Oh dear, all in use. */
523 spin_unlock(&all_mddevs_lock
);
529 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
530 if (mddev
->unit
== dev
) {
536 new->md_minor
= MINOR(dev
);
537 new->hold_active
= UNTIL_STOP
;
538 list_add(&new->all_mddevs
, &all_mddevs
);
539 spin_unlock(&all_mddevs_lock
);
542 spin_unlock(&all_mddevs_lock
);
544 new = kzalloc(sizeof(*new), GFP_KERNEL
);
549 if (MAJOR(unit
) == MD_MAJOR
)
550 new->md_minor
= MINOR(unit
);
552 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
559 static inline int mddev_lock(mddev_t
* mddev
)
561 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
564 static inline int mddev_is_locked(mddev_t
*mddev
)
566 return mutex_is_locked(&mddev
->reconfig_mutex
);
569 static inline int mddev_trylock(mddev_t
* mddev
)
571 return mutex_trylock(&mddev
->reconfig_mutex
);
574 static struct attribute_group md_redundancy_group
;
576 static void mddev_unlock(mddev_t
* mddev
)
578 if (mddev
->to_remove
) {
579 /* These cannot be removed under reconfig_mutex as
580 * an access to the files will try to take reconfig_mutex
581 * while holding the file unremovable, which leads to
583 * So hold set sysfs_active while the remove in happeing,
584 * and anything else which might set ->to_remove or my
585 * otherwise change the sysfs namespace will fail with
586 * -EBUSY if sysfs_active is still set.
587 * We set sysfs_active under reconfig_mutex and elsewhere
588 * test it under the same mutex to ensure its correct value
591 struct attribute_group
*to_remove
= mddev
->to_remove
;
592 mddev
->to_remove
= NULL
;
593 mddev
->sysfs_active
= 1;
594 mutex_unlock(&mddev
->reconfig_mutex
);
596 if (mddev
->kobj
.sd
) {
597 if (to_remove
!= &md_redundancy_group
)
598 sysfs_remove_group(&mddev
->kobj
, to_remove
);
599 if (mddev
->pers
== NULL
||
600 mddev
->pers
->sync_request
== NULL
) {
601 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
602 if (mddev
->sysfs_action
)
603 sysfs_put(mddev
->sysfs_action
);
604 mddev
->sysfs_action
= NULL
;
607 mddev
->sysfs_active
= 0;
609 mutex_unlock(&mddev
->reconfig_mutex
);
611 md_wakeup_thread(mddev
->thread
);
614 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
618 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
619 if (rdev
->desc_nr
== nr
)
625 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
629 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
630 if (rdev
->bdev
->bd_dev
== dev
)
636 static struct mdk_personality
*find_pers(int level
, char *clevel
)
638 struct mdk_personality
*pers
;
639 list_for_each_entry(pers
, &pers_list
, list
) {
640 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
642 if (strcmp(pers
->name
, clevel
)==0)
648 /* return the offset of the super block in 512byte sectors */
649 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
651 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
652 return MD_NEW_SIZE_SECTORS(num_sectors
);
655 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
660 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
661 if (!rdev
->sb_page
) {
662 printk(KERN_ALERT
"md: out of memory.\n");
669 static void free_disk_sb(mdk_rdev_t
* rdev
)
672 put_page(rdev
->sb_page
);
674 rdev
->sb_page
= NULL
;
681 static void super_written(struct bio
*bio
, int error
)
683 mdk_rdev_t
*rdev
= bio
->bi_private
;
684 mddev_t
*mddev
= rdev
->mddev
;
686 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
687 printk("md: super_written gets error=%d, uptodate=%d\n",
688 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
689 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
690 md_error(mddev
, rdev
);
693 if (atomic_dec_and_test(&mddev
->pending_writes
))
694 wake_up(&mddev
->sb_wait
);
698 static void super_written_barrier(struct bio
*bio
, int error
)
700 struct bio
*bio2
= bio
->bi_private
;
701 mdk_rdev_t
*rdev
= bio2
->bi_private
;
702 mddev_t
*mddev
= rdev
->mddev
;
704 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
705 error
== -EOPNOTSUPP
) {
707 /* barriers don't appear to be supported :-( */
708 set_bit(BarriersNotsupp
, &rdev
->flags
);
709 mddev
->barriers_work
= 0;
710 spin_lock_irqsave(&mddev
->write_lock
, flags
);
711 bio2
->bi_next
= mddev
->biolist
;
712 mddev
->biolist
= bio2
;
713 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
714 wake_up(&mddev
->sb_wait
);
718 bio
->bi_private
= rdev
;
719 super_written(bio
, error
);
723 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
724 sector_t sector
, int size
, struct page
*page
)
726 /* write first size bytes of page to sector of rdev
727 * Increment mddev->pending_writes before returning
728 * and decrement it on completion, waking up sb_wait
729 * if zero is reached.
730 * If an error occurred, call md_error
732 * As we might need to resubmit the request if BIO_RW_BARRIER
733 * causes ENOTSUPP, we allocate a spare bio...
735 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
736 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNCIO
) | (1<<BIO_RW_UNPLUG
);
738 bio
->bi_bdev
= rdev
->bdev
;
739 bio
->bi_sector
= sector
;
740 bio_add_page(bio
, page
, size
, 0);
741 bio
->bi_private
= rdev
;
742 bio
->bi_end_io
= super_written
;
745 atomic_inc(&mddev
->pending_writes
);
746 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
748 rw
|= (1<<BIO_RW_BARRIER
);
749 rbio
= bio_clone(bio
, GFP_NOIO
);
750 rbio
->bi_private
= bio
;
751 rbio
->bi_end_io
= super_written_barrier
;
752 submit_bio(rw
, rbio
);
757 void md_super_wait(mddev_t
*mddev
)
759 /* wait for all superblock writes that were scheduled to complete.
760 * if any had to be retried (due to BARRIER problems), retry them
764 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
765 if (atomic_read(&mddev
->pending_writes
)==0)
767 while (mddev
->biolist
) {
769 spin_lock_irq(&mddev
->write_lock
);
770 bio
= mddev
->biolist
;
771 mddev
->biolist
= bio
->bi_next
;
773 spin_unlock_irq(&mddev
->write_lock
);
774 submit_bio(bio
->bi_rw
, bio
);
778 finish_wait(&mddev
->sb_wait
, &wq
);
781 static void bi_complete(struct bio
*bio
, int error
)
783 complete((struct completion
*)bio
->bi_private
);
786 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
787 struct page
*page
, int rw
)
789 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
790 struct completion event
;
793 rw
|= (1 << BIO_RW_SYNCIO
) | (1 << BIO_RW_UNPLUG
);
796 bio
->bi_sector
= sector
;
797 bio_add_page(bio
, page
, size
, 0);
798 init_completion(&event
);
799 bio
->bi_private
= &event
;
800 bio
->bi_end_io
= bi_complete
;
802 wait_for_completion(&event
);
804 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
808 EXPORT_SYMBOL_GPL(sync_page_io
);
810 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
812 char b
[BDEVNAME_SIZE
];
813 if (!rdev
->sb_page
) {
821 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
827 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
828 bdevname(rdev
->bdev
,b
));
832 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
834 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
835 sb1
->set_uuid1
== sb2
->set_uuid1
&&
836 sb1
->set_uuid2
== sb2
->set_uuid2
&&
837 sb1
->set_uuid3
== sb2
->set_uuid3
;
840 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
843 mdp_super_t
*tmp1
, *tmp2
;
845 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
846 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
848 if (!tmp1
|| !tmp2
) {
850 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
858 * nr_disks is not constant
863 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
871 static u32
md_csum_fold(u32 csum
)
873 csum
= (csum
& 0xffff) + (csum
>> 16);
874 return (csum
& 0xffff) + (csum
>> 16);
877 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
880 u32
*sb32
= (u32
*)sb
;
882 unsigned int disk_csum
, csum
;
884 disk_csum
= sb
->sb_csum
;
887 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
889 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
893 /* This used to use csum_partial, which was wrong for several
894 * reasons including that different results are returned on
895 * different architectures. It isn't critical that we get exactly
896 * the same return value as before (we always csum_fold before
897 * testing, and that removes any differences). However as we
898 * know that csum_partial always returned a 16bit value on
899 * alphas, do a fold to maximise conformity to previous behaviour.
901 sb
->sb_csum
= md_csum_fold(disk_csum
);
903 sb
->sb_csum
= disk_csum
;
910 * Handle superblock details.
911 * We want to be able to handle multiple superblock formats
912 * so we have a common interface to them all, and an array of
913 * different handlers.
914 * We rely on user-space to write the initial superblock, and support
915 * reading and updating of superblocks.
916 * Interface methods are:
917 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
918 * loads and validates a superblock on dev.
919 * if refdev != NULL, compare superblocks on both devices
921 * 0 - dev has a superblock that is compatible with refdev
922 * 1 - dev has a superblock that is compatible and newer than refdev
923 * so dev should be used as the refdev in future
924 * -EINVAL superblock incompatible or invalid
925 * -othererror e.g. -EIO
927 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
928 * Verify that dev is acceptable into mddev.
929 * The first time, mddev->raid_disks will be 0, and data from
930 * dev should be merged in. Subsequent calls check that dev
931 * is new enough. Return 0 or -EINVAL
933 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
934 * Update the superblock for rdev with data in mddev
935 * This does not write to disc.
941 struct module
*owner
;
942 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
944 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
945 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
946 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
947 sector_t num_sectors
);
951 * Check that the given mddev has no bitmap.
953 * This function is called from the run method of all personalities that do not
954 * support bitmaps. It prints an error message and returns non-zero if mddev
955 * has a bitmap. Otherwise, it returns 0.
958 int md_check_no_bitmap(mddev_t
*mddev
)
960 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
962 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
963 mdname(mddev
), mddev
->pers
->name
);
966 EXPORT_SYMBOL(md_check_no_bitmap
);
969 * load_super for 0.90.0
971 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
973 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
978 * Calculate the position of the superblock (512byte sectors),
979 * it's at the end of the disk.
981 * It also happens to be a multiple of 4Kb.
983 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
985 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
990 bdevname(rdev
->bdev
, b
);
991 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
993 if (sb
->md_magic
!= MD_SB_MAGIC
) {
994 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
999 if (sb
->major_version
!= 0 ||
1000 sb
->minor_version
< 90 ||
1001 sb
->minor_version
> 91) {
1002 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1003 sb
->major_version
, sb
->minor_version
,
1008 if (sb
->raid_disks
<= 0)
1011 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1012 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1017 rdev
->preferred_minor
= sb
->md_minor
;
1018 rdev
->data_offset
= 0;
1019 rdev
->sb_size
= MD_SB_BYTES
;
1021 if (sb
->level
== LEVEL_MULTIPATH
)
1024 rdev
->desc_nr
= sb
->this_disk
.number
;
1030 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
1031 if (!uuid_equal(refsb
, sb
)) {
1032 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1033 b
, bdevname(refdev
->bdev
,b2
));
1036 if (!sb_equal(refsb
, sb
)) {
1037 printk(KERN_WARNING
"md: %s has same UUID"
1038 " but different superblock to %s\n",
1039 b
, bdevname(refdev
->bdev
, b2
));
1043 ev2
= md_event(refsb
);
1049 rdev
->sectors
= rdev
->sb_start
;
1051 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
1052 /* "this cannot possibly happen" ... */
1060 * validate_super for 0.90.0
1062 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1065 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1066 __u64 ev1
= md_event(sb
);
1068 rdev
->raid_disk
= -1;
1069 clear_bit(Faulty
, &rdev
->flags
);
1070 clear_bit(In_sync
, &rdev
->flags
);
1071 clear_bit(WriteMostly
, &rdev
->flags
);
1072 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1074 if (mddev
->raid_disks
== 0) {
1075 mddev
->major_version
= 0;
1076 mddev
->minor_version
= sb
->minor_version
;
1077 mddev
->patch_version
= sb
->patch_version
;
1078 mddev
->external
= 0;
1079 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1080 mddev
->ctime
= sb
->ctime
;
1081 mddev
->utime
= sb
->utime
;
1082 mddev
->level
= sb
->level
;
1083 mddev
->clevel
[0] = 0;
1084 mddev
->layout
= sb
->layout
;
1085 mddev
->raid_disks
= sb
->raid_disks
;
1086 mddev
->dev_sectors
= sb
->size
* 2;
1087 mddev
->events
= ev1
;
1088 mddev
->bitmap_info
.offset
= 0;
1089 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1091 if (mddev
->minor_version
>= 91) {
1092 mddev
->reshape_position
= sb
->reshape_position
;
1093 mddev
->delta_disks
= sb
->delta_disks
;
1094 mddev
->new_level
= sb
->new_level
;
1095 mddev
->new_layout
= sb
->new_layout
;
1096 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1098 mddev
->reshape_position
= MaxSector
;
1099 mddev
->delta_disks
= 0;
1100 mddev
->new_level
= mddev
->level
;
1101 mddev
->new_layout
= mddev
->layout
;
1102 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1105 if (sb
->state
& (1<<MD_SB_CLEAN
))
1106 mddev
->recovery_cp
= MaxSector
;
1108 if (sb
->events_hi
== sb
->cp_events_hi
&&
1109 sb
->events_lo
== sb
->cp_events_lo
) {
1110 mddev
->recovery_cp
= sb
->recovery_cp
;
1112 mddev
->recovery_cp
= 0;
1115 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1116 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1117 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1118 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1120 mddev
->max_disks
= MD_SB_DISKS
;
1122 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1123 mddev
->bitmap_info
.file
== NULL
)
1124 mddev
->bitmap_info
.offset
=
1125 mddev
->bitmap_info
.default_offset
;
1127 } else if (mddev
->pers
== NULL
) {
1128 /* Insist on good event counter while assembling, except
1129 * for spares (which don't need an event count) */
1131 if (sb
->disks
[rdev
->desc_nr
].state
& (
1132 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1133 if (ev1
< mddev
->events
)
1135 } else if (mddev
->bitmap
) {
1136 /* if adding to array with a bitmap, then we can accept an
1137 * older device ... but not too old.
1139 if (ev1
< mddev
->bitmap
->events_cleared
)
1142 if (ev1
< mddev
->events
)
1143 /* just a hot-add of a new device, leave raid_disk at -1 */
1147 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1148 desc
= sb
->disks
+ rdev
->desc_nr
;
1150 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1151 set_bit(Faulty
, &rdev
->flags
);
1152 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1153 desc->raid_disk < mddev->raid_disks */) {
1154 set_bit(In_sync
, &rdev
->flags
);
1155 rdev
->raid_disk
= desc
->raid_disk
;
1156 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1157 /* active but not in sync implies recovery up to
1158 * reshape position. We don't know exactly where
1159 * that is, so set to zero for now */
1160 if (mddev
->minor_version
>= 91) {
1161 rdev
->recovery_offset
= 0;
1162 rdev
->raid_disk
= desc
->raid_disk
;
1165 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1166 set_bit(WriteMostly
, &rdev
->flags
);
1167 } else /* MULTIPATH are always insync */
1168 set_bit(In_sync
, &rdev
->flags
);
1173 * sync_super for 0.90.0
1175 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1179 int next_spare
= mddev
->raid_disks
;
1182 /* make rdev->sb match mddev data..
1185 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1186 * 3/ any empty disks < next_spare become removed
1188 * disks[0] gets initialised to REMOVED because
1189 * we cannot be sure from other fields if it has
1190 * been initialised or not.
1193 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1195 rdev
->sb_size
= MD_SB_BYTES
;
1197 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1199 memset(sb
, 0, sizeof(*sb
));
1201 sb
->md_magic
= MD_SB_MAGIC
;
1202 sb
->major_version
= mddev
->major_version
;
1203 sb
->patch_version
= mddev
->patch_version
;
1204 sb
->gvalid_words
= 0; /* ignored */
1205 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1206 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1207 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1208 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1210 sb
->ctime
= mddev
->ctime
;
1211 sb
->level
= mddev
->level
;
1212 sb
->size
= mddev
->dev_sectors
/ 2;
1213 sb
->raid_disks
= mddev
->raid_disks
;
1214 sb
->md_minor
= mddev
->md_minor
;
1215 sb
->not_persistent
= 0;
1216 sb
->utime
= mddev
->utime
;
1218 sb
->events_hi
= (mddev
->events
>>32);
1219 sb
->events_lo
= (u32
)mddev
->events
;
1221 if (mddev
->reshape_position
== MaxSector
)
1222 sb
->minor_version
= 90;
1224 sb
->minor_version
= 91;
1225 sb
->reshape_position
= mddev
->reshape_position
;
1226 sb
->new_level
= mddev
->new_level
;
1227 sb
->delta_disks
= mddev
->delta_disks
;
1228 sb
->new_layout
= mddev
->new_layout
;
1229 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1231 mddev
->minor_version
= sb
->minor_version
;
1234 sb
->recovery_cp
= mddev
->recovery_cp
;
1235 sb
->cp_events_hi
= (mddev
->events
>>32);
1236 sb
->cp_events_lo
= (u32
)mddev
->events
;
1237 if (mddev
->recovery_cp
== MaxSector
)
1238 sb
->state
= (1<< MD_SB_CLEAN
);
1240 sb
->recovery_cp
= 0;
1242 sb
->layout
= mddev
->layout
;
1243 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1245 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1246 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1248 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1249 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1252 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1254 if (rdev2
->raid_disk
>= 0 &&
1255 sb
->minor_version
>= 91)
1256 /* we have nowhere to store the recovery_offset,
1257 * but if it is not below the reshape_position,
1258 * we can piggy-back on that.
1261 if (rdev2
->raid_disk
< 0 ||
1262 test_bit(Faulty
, &rdev2
->flags
))
1265 desc_nr
= rdev2
->raid_disk
;
1267 desc_nr
= next_spare
++;
1268 rdev2
->desc_nr
= desc_nr
;
1269 d
= &sb
->disks
[rdev2
->desc_nr
];
1271 d
->number
= rdev2
->desc_nr
;
1272 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1273 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1275 d
->raid_disk
= rdev2
->raid_disk
;
1277 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1278 if (test_bit(Faulty
, &rdev2
->flags
))
1279 d
->state
= (1<<MD_DISK_FAULTY
);
1280 else if (is_active
) {
1281 d
->state
= (1<<MD_DISK_ACTIVE
);
1282 if (test_bit(In_sync
, &rdev2
->flags
))
1283 d
->state
|= (1<<MD_DISK_SYNC
);
1291 if (test_bit(WriteMostly
, &rdev2
->flags
))
1292 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1294 /* now set the "removed" and "faulty" bits on any missing devices */
1295 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1296 mdp_disk_t
*d
= &sb
->disks
[i
];
1297 if (d
->state
== 0 && d
->number
== 0) {
1300 d
->state
= (1<<MD_DISK_REMOVED
);
1301 d
->state
|= (1<<MD_DISK_FAULTY
);
1305 sb
->nr_disks
= nr_disks
;
1306 sb
->active_disks
= active
;
1307 sb
->working_disks
= working
;
1308 sb
->failed_disks
= failed
;
1309 sb
->spare_disks
= spare
;
1311 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1312 sb
->sb_csum
= calc_sb_csum(sb
);
1316 * rdev_size_change for 0.90.0
1318 static unsigned long long
1319 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1321 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1322 return 0; /* component must fit device */
1323 if (rdev
->mddev
->bitmap_info
.offset
)
1324 return 0; /* can't move bitmap */
1325 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1326 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1327 num_sectors
= rdev
->sb_start
;
1328 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1330 md_super_wait(rdev
->mddev
);
1331 return num_sectors
/ 2; /* kB for sysfs */
1336 * version 1 superblock
1339 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1343 unsigned long long newcsum
;
1344 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1345 __le32
*isuper
= (__le32
*)sb
;
1348 disk_csum
= sb
->sb_csum
;
1351 for (i
=0; size
>=4; size
-= 4 )
1352 newcsum
+= le32_to_cpu(*isuper
++);
1355 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1357 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1358 sb
->sb_csum
= disk_csum
;
1359 return cpu_to_le32(csum
);
1362 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1364 struct mdp_superblock_1
*sb
;
1367 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1371 * Calculate the position of the superblock in 512byte sectors.
1372 * It is always aligned to a 4K boundary and
1373 * depeding on minor_version, it can be:
1374 * 0: At least 8K, but less than 12K, from end of device
1375 * 1: At start of device
1376 * 2: 4K from start of device.
1378 switch(minor_version
) {
1380 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1382 sb_start
&= ~(sector_t
)(4*2-1);
1393 rdev
->sb_start
= sb_start
;
1395 /* superblock is rarely larger than 1K, but it can be larger,
1396 * and it is safe to read 4k, so we do that
1398 ret
= read_disk_sb(rdev
, 4096);
1399 if (ret
) return ret
;
1402 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1404 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1405 sb
->major_version
!= cpu_to_le32(1) ||
1406 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1407 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1408 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1411 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1412 printk("md: invalid superblock checksum on %s\n",
1413 bdevname(rdev
->bdev
,b
));
1416 if (le64_to_cpu(sb
->data_size
) < 10) {
1417 printk("md: data_size too small on %s\n",
1418 bdevname(rdev
->bdev
,b
));
1422 rdev
->preferred_minor
= 0xffff;
1423 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1424 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1426 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1427 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1428 if (rdev
->sb_size
& bmask
)
1429 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1432 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1435 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1438 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1444 struct mdp_superblock_1
*refsb
=
1445 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1447 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1448 sb
->level
!= refsb
->level
||
1449 sb
->layout
!= refsb
->layout
||
1450 sb
->chunksize
!= refsb
->chunksize
) {
1451 printk(KERN_WARNING
"md: %s has strangely different"
1452 " superblock to %s\n",
1453 bdevname(rdev
->bdev
,b
),
1454 bdevname(refdev
->bdev
,b2
));
1457 ev1
= le64_to_cpu(sb
->events
);
1458 ev2
= le64_to_cpu(refsb
->events
);
1466 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1467 le64_to_cpu(sb
->data_offset
);
1469 rdev
->sectors
= rdev
->sb_start
;
1470 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1472 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1473 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1478 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1480 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1481 __u64 ev1
= le64_to_cpu(sb
->events
);
1483 rdev
->raid_disk
= -1;
1484 clear_bit(Faulty
, &rdev
->flags
);
1485 clear_bit(In_sync
, &rdev
->flags
);
1486 clear_bit(WriteMostly
, &rdev
->flags
);
1487 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1489 if (mddev
->raid_disks
== 0) {
1490 mddev
->major_version
= 1;
1491 mddev
->patch_version
= 0;
1492 mddev
->external
= 0;
1493 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1494 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1495 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1496 mddev
->level
= le32_to_cpu(sb
->level
);
1497 mddev
->clevel
[0] = 0;
1498 mddev
->layout
= le32_to_cpu(sb
->layout
);
1499 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1500 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1501 mddev
->events
= ev1
;
1502 mddev
->bitmap_info
.offset
= 0;
1503 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1505 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1506 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1508 mddev
->max_disks
= (4096-256)/2;
1510 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1511 mddev
->bitmap_info
.file
== NULL
)
1512 mddev
->bitmap_info
.offset
=
1513 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1515 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1516 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1517 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1518 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1519 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1520 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1522 mddev
->reshape_position
= MaxSector
;
1523 mddev
->delta_disks
= 0;
1524 mddev
->new_level
= mddev
->level
;
1525 mddev
->new_layout
= mddev
->layout
;
1526 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1529 } else if (mddev
->pers
== NULL
) {
1530 /* Insist of good event counter while assembling, except for
1531 * spares (which don't need an event count) */
1533 if (rdev
->desc_nr
>= 0 &&
1534 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1535 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1536 if (ev1
< mddev
->events
)
1538 } else if (mddev
->bitmap
) {
1539 /* If adding to array with a bitmap, then we can accept an
1540 * older device, but not too old.
1542 if (ev1
< mddev
->bitmap
->events_cleared
)
1545 if (ev1
< mddev
->events
)
1546 /* just a hot-add of a new device, leave raid_disk at -1 */
1549 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1551 if (rdev
->desc_nr
< 0 ||
1552 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1556 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1558 case 0xffff: /* spare */
1560 case 0xfffe: /* faulty */
1561 set_bit(Faulty
, &rdev
->flags
);
1564 if ((le32_to_cpu(sb
->feature_map
) &
1565 MD_FEATURE_RECOVERY_OFFSET
))
1566 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1568 set_bit(In_sync
, &rdev
->flags
);
1569 rdev
->raid_disk
= role
;
1572 if (sb
->devflags
& WriteMostly1
)
1573 set_bit(WriteMostly
, &rdev
->flags
);
1574 } else /* MULTIPATH are always insync */
1575 set_bit(In_sync
, &rdev
->flags
);
1580 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1582 struct mdp_superblock_1
*sb
;
1585 /* make rdev->sb match mddev and rdev data. */
1587 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1589 sb
->feature_map
= 0;
1591 sb
->recovery_offset
= cpu_to_le64(0);
1592 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1593 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1594 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1596 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1597 sb
->events
= cpu_to_le64(mddev
->events
);
1599 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1601 sb
->resync_offset
= cpu_to_le64(0);
1603 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1605 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1606 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1607 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1608 sb
->level
= cpu_to_le32(mddev
->level
);
1609 sb
->layout
= cpu_to_le32(mddev
->layout
);
1611 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1612 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1613 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1616 if (rdev
->raid_disk
>= 0 &&
1617 !test_bit(In_sync
, &rdev
->flags
)) {
1619 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1620 sb
->recovery_offset
=
1621 cpu_to_le64(rdev
->recovery_offset
);
1624 if (mddev
->reshape_position
!= MaxSector
) {
1625 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1626 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1627 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1628 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1629 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1630 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1634 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1635 if (rdev2
->desc_nr
+1 > max_dev
)
1636 max_dev
= rdev2
->desc_nr
+1;
1638 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1640 sb
->max_dev
= cpu_to_le32(max_dev
);
1641 rdev
->sb_size
= max_dev
* 2 + 256;
1642 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1643 if (rdev
->sb_size
& bmask
)
1644 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1646 for (i
=0; i
<max_dev
;i
++)
1647 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1649 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1651 if (test_bit(Faulty
, &rdev2
->flags
))
1652 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1653 else if (test_bit(In_sync
, &rdev2
->flags
))
1654 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1655 else if (rdev2
->raid_disk
>= 0)
1656 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1658 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1661 sb
->sb_csum
= calc_sb_1_csum(sb
);
1664 static unsigned long long
1665 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1667 struct mdp_superblock_1
*sb
;
1668 sector_t max_sectors
;
1669 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1670 return 0; /* component must fit device */
1671 if (rdev
->sb_start
< rdev
->data_offset
) {
1672 /* minor versions 1 and 2; superblock before data */
1673 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1674 max_sectors
-= rdev
->data_offset
;
1675 if (!num_sectors
|| num_sectors
> max_sectors
)
1676 num_sectors
= max_sectors
;
1677 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1678 /* minor version 0 with bitmap we can't move */
1681 /* minor version 0; superblock after data */
1683 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1684 sb_start
&= ~(sector_t
)(4*2 - 1);
1685 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1686 if (!num_sectors
|| num_sectors
> max_sectors
)
1687 num_sectors
= max_sectors
;
1688 rdev
->sb_start
= sb_start
;
1690 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1691 sb
->data_size
= cpu_to_le64(num_sectors
);
1692 sb
->super_offset
= rdev
->sb_start
;
1693 sb
->sb_csum
= calc_sb_1_csum(sb
);
1694 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1696 md_super_wait(rdev
->mddev
);
1697 return num_sectors
/ 2; /* kB for sysfs */
1700 static struct super_type super_types
[] = {
1703 .owner
= THIS_MODULE
,
1704 .load_super
= super_90_load
,
1705 .validate_super
= super_90_validate
,
1706 .sync_super
= super_90_sync
,
1707 .rdev_size_change
= super_90_rdev_size_change
,
1711 .owner
= THIS_MODULE
,
1712 .load_super
= super_1_load
,
1713 .validate_super
= super_1_validate
,
1714 .sync_super
= super_1_sync
,
1715 .rdev_size_change
= super_1_rdev_size_change
,
1719 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1721 mdk_rdev_t
*rdev
, *rdev2
;
1724 rdev_for_each_rcu(rdev
, mddev1
)
1725 rdev_for_each_rcu(rdev2
, mddev2
)
1726 if (rdev
->bdev
->bd_contains
==
1727 rdev2
->bdev
->bd_contains
) {
1735 static LIST_HEAD(pending_raid_disks
);
1738 * Try to register data integrity profile for an mddev
1740 * This is called when an array is started and after a disk has been kicked
1741 * from the array. It only succeeds if all working and active component devices
1742 * are integrity capable with matching profiles.
1744 int md_integrity_register(mddev_t
*mddev
)
1746 mdk_rdev_t
*rdev
, *reference
= NULL
;
1748 if (list_empty(&mddev
->disks
))
1749 return 0; /* nothing to do */
1750 if (blk_get_integrity(mddev
->gendisk
))
1751 return 0; /* already registered */
1752 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1753 /* skip spares and non-functional disks */
1754 if (test_bit(Faulty
, &rdev
->flags
))
1756 if (rdev
->raid_disk
< 0)
1759 * If at least one rdev is not integrity capable, we can not
1760 * enable data integrity for the md device.
1762 if (!bdev_get_integrity(rdev
->bdev
))
1765 /* Use the first rdev as the reference */
1769 /* does this rdev's profile match the reference profile? */
1770 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1771 rdev
->bdev
->bd_disk
) < 0)
1775 * All component devices are integrity capable and have matching
1776 * profiles, register the common profile for the md device.
1778 if (blk_integrity_register(mddev
->gendisk
,
1779 bdev_get_integrity(reference
->bdev
)) != 0) {
1780 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1784 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1788 EXPORT_SYMBOL(md_integrity_register
);
1790 /* Disable data integrity if non-capable/non-matching disk is being added */
1791 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1793 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1794 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1796 if (!bi_mddev
) /* nothing to do */
1798 if (rdev
->raid_disk
< 0) /* skip spares */
1800 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1801 rdev
->bdev
->bd_disk
) >= 0)
1803 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1804 blk_integrity_unregister(mddev
->gendisk
);
1806 EXPORT_SYMBOL(md_integrity_add_rdev
);
1808 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1810 char b
[BDEVNAME_SIZE
];
1820 /* prevent duplicates */
1821 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1824 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1825 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1826 rdev
->sectors
< mddev
->dev_sectors
)) {
1828 /* Cannot change size, so fail
1829 * If mddev->level <= 0, then we don't care
1830 * about aligning sizes (e.g. linear)
1832 if (mddev
->level
> 0)
1835 mddev
->dev_sectors
= rdev
->sectors
;
1838 /* Verify rdev->desc_nr is unique.
1839 * If it is -1, assign a free number, else
1840 * check number is not in use
1842 if (rdev
->desc_nr
< 0) {
1844 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1845 while (find_rdev_nr(mddev
, choice
))
1847 rdev
->desc_nr
= choice
;
1849 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1852 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1853 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1854 mdname(mddev
), mddev
->max_disks
);
1857 bdevname(rdev
->bdev
,b
);
1858 while ( (s
=strchr(b
, '/')) != NULL
)
1861 rdev
->mddev
= mddev
;
1862 printk(KERN_INFO
"md: bind<%s>\n", b
);
1864 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1867 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1868 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1869 /* failure here is OK */;
1870 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1872 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1873 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1875 /* May as well allow recovery to be retried once */
1876 mddev
->recovery_disabled
= 0;
1881 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1886 static void md_delayed_delete(struct work_struct
*ws
)
1888 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1889 kobject_del(&rdev
->kobj
);
1890 kobject_put(&rdev
->kobj
);
1893 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1895 char b
[BDEVNAME_SIZE
];
1900 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1901 list_del_rcu(&rdev
->same_set
);
1902 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1904 sysfs_remove_link(&rdev
->kobj
, "block");
1905 sysfs_put(rdev
->sysfs_state
);
1906 rdev
->sysfs_state
= NULL
;
1907 /* We need to delay this, otherwise we can deadlock when
1908 * writing to 'remove' to "dev/state". We also need
1909 * to delay it due to rcu usage.
1912 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1913 kobject_get(&rdev
->kobj
);
1914 schedule_work(&rdev
->del_work
);
1918 * prevent the device from being mounted, repartitioned or
1919 * otherwise reused by a RAID array (or any other kernel
1920 * subsystem), by bd_claiming the device.
1922 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1925 struct block_device
*bdev
;
1926 char b
[BDEVNAME_SIZE
];
1928 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1930 printk(KERN_ERR
"md: could not open %s.\n",
1931 __bdevname(dev
, b
));
1932 return PTR_ERR(bdev
);
1934 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1936 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1938 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1942 set_bit(AllReserved
, &rdev
->flags
);
1947 static void unlock_rdev(mdk_rdev_t
*rdev
)
1949 struct block_device
*bdev
= rdev
->bdev
;
1954 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1957 void md_autodetect_dev(dev_t dev
);
1959 static void export_rdev(mdk_rdev_t
* rdev
)
1961 char b
[BDEVNAME_SIZE
];
1962 printk(KERN_INFO
"md: export_rdev(%s)\n",
1963 bdevname(rdev
->bdev
,b
));
1968 if (test_bit(AutoDetected
, &rdev
->flags
))
1969 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1972 kobject_put(&rdev
->kobj
);
1975 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1977 unbind_rdev_from_array(rdev
);
1981 static void export_array(mddev_t
*mddev
)
1983 mdk_rdev_t
*rdev
, *tmp
;
1985 rdev_for_each(rdev
, tmp
, mddev
) {
1990 kick_rdev_from_array(rdev
);
1992 if (!list_empty(&mddev
->disks
))
1994 mddev
->raid_disks
= 0;
1995 mddev
->major_version
= 0;
1998 static void print_desc(mdp_disk_t
*desc
)
2000 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2001 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2004 static void print_sb_90(mdp_super_t
*sb
)
2009 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2010 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2011 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2013 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2014 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2015 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2016 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2017 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2018 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2019 sb
->failed_disks
, sb
->spare_disks
,
2020 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2023 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2026 desc
= sb
->disks
+ i
;
2027 if (desc
->number
|| desc
->major
|| desc
->minor
||
2028 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2029 printk(" D %2d: ", i
);
2033 printk(KERN_INFO
"md: THIS: ");
2034 print_desc(&sb
->this_disk
);
2037 static void print_sb_1(struct mdp_superblock_1
*sb
)
2041 uuid
= sb
->set_uuid
;
2043 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2044 "md: Name: \"%s\" CT:%llu\n",
2045 le32_to_cpu(sb
->major_version
),
2046 le32_to_cpu(sb
->feature_map
),
2049 (unsigned long long)le64_to_cpu(sb
->ctime
)
2050 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2052 uuid
= sb
->device_uuid
;
2054 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2056 "md: Dev:%08x UUID: %pU\n"
2057 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2058 "md: (MaxDev:%u) \n",
2059 le32_to_cpu(sb
->level
),
2060 (unsigned long long)le64_to_cpu(sb
->size
),
2061 le32_to_cpu(sb
->raid_disks
),
2062 le32_to_cpu(sb
->layout
),
2063 le32_to_cpu(sb
->chunksize
),
2064 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2065 (unsigned long long)le64_to_cpu(sb
->data_size
),
2066 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2067 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2068 le32_to_cpu(sb
->dev_number
),
2071 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2072 (unsigned long long)le64_to_cpu(sb
->events
),
2073 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2074 le32_to_cpu(sb
->sb_csum
),
2075 le32_to_cpu(sb
->max_dev
)
2079 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2081 char b
[BDEVNAME_SIZE
];
2082 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2083 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2084 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2086 if (rdev
->sb_loaded
) {
2087 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2088 switch (major_version
) {
2090 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2093 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2097 printk(KERN_INFO
"md: no rdev superblock!\n");
2100 static void md_print_devices(void)
2102 struct list_head
*tmp
;
2105 char b
[BDEVNAME_SIZE
];
2108 printk("md: **********************************\n");
2109 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2110 printk("md: **********************************\n");
2111 for_each_mddev(mddev
, tmp
) {
2114 bitmap_print_sb(mddev
->bitmap
);
2116 printk("%s: ", mdname(mddev
));
2117 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2118 printk("<%s>", bdevname(rdev
->bdev
,b
));
2121 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2122 print_rdev(rdev
, mddev
->major_version
);
2124 printk("md: **********************************\n");
2129 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2131 /* Update each superblock (in-memory image), but
2132 * if we are allowed to, skip spares which already
2133 * have the right event counter, or have one earlier
2134 * (which would mean they aren't being marked as dirty
2135 * with the rest of the array)
2139 /* First make sure individual recovery_offsets are correct */
2140 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2141 if (rdev
->raid_disk
>= 0 &&
2142 mddev
->delta_disks
>= 0 &&
2143 !test_bit(In_sync
, &rdev
->flags
) &&
2144 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2145 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2148 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2149 if (rdev
->sb_events
== mddev
->events
||
2151 rdev
->raid_disk
< 0 &&
2152 rdev
->sb_events
+1 == mddev
->events
)) {
2153 /* Don't update this superblock */
2154 rdev
->sb_loaded
= 2;
2156 super_types
[mddev
->major_version
].
2157 sync_super(mddev
, rdev
);
2158 rdev
->sb_loaded
= 1;
2163 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2169 mddev
->utime
= get_seconds();
2170 if (mddev
->external
)
2173 spin_lock_irq(&mddev
->write_lock
);
2175 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2176 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2178 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2179 /* just a clean<-> dirty transition, possibly leave spares alone,
2180 * though if events isn't the right even/odd, we will have to do
2186 if (mddev
->degraded
)
2187 /* If the array is degraded, then skipping spares is both
2188 * dangerous and fairly pointless.
2189 * Dangerous because a device that was removed from the array
2190 * might have a event_count that still looks up-to-date,
2191 * so it can be re-added without a resync.
2192 * Pointless because if there are any spares to skip,
2193 * then a recovery will happen and soon that array won't
2194 * be degraded any more and the spare can go back to sleep then.
2198 sync_req
= mddev
->in_sync
;
2200 /* If this is just a dirty<->clean transition, and the array is clean
2201 * and 'events' is odd, we can roll back to the previous clean state */
2203 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2204 && mddev
->can_decrease_events
2205 && mddev
->events
!= 1) {
2207 mddev
->can_decrease_events
= 0;
2209 /* otherwise we have to go forward and ... */
2211 mddev
->can_decrease_events
= nospares
;
2214 if (!mddev
->events
) {
2216 * oops, this 64-bit counter should never wrap.
2217 * Either we are in around ~1 trillion A.C., assuming
2218 * 1 reboot per second, or we have a bug:
2225 * do not write anything to disk if using
2226 * nonpersistent superblocks
2228 if (!mddev
->persistent
) {
2229 if (!mddev
->external
)
2230 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2232 spin_unlock_irq(&mddev
->write_lock
);
2233 wake_up(&mddev
->sb_wait
);
2236 sync_sbs(mddev
, nospares
);
2237 spin_unlock_irq(&mddev
->write_lock
);
2240 "md: updating %s RAID superblock on device (in sync %d)\n",
2241 mdname(mddev
),mddev
->in_sync
);
2243 bitmap_update_sb(mddev
->bitmap
);
2244 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2245 char b
[BDEVNAME_SIZE
];
2246 dprintk(KERN_INFO
"md: ");
2247 if (rdev
->sb_loaded
!= 1)
2248 continue; /* no noise on spare devices */
2249 if (test_bit(Faulty
, &rdev
->flags
))
2250 dprintk("(skipping faulty ");
2252 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2253 if (!test_bit(Faulty
, &rdev
->flags
)) {
2254 md_super_write(mddev
,rdev
,
2255 rdev
->sb_start
, rdev
->sb_size
,
2257 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2258 bdevname(rdev
->bdev
,b
),
2259 (unsigned long long)rdev
->sb_start
);
2260 rdev
->sb_events
= mddev
->events
;
2264 if (mddev
->level
== LEVEL_MULTIPATH
)
2265 /* only need to write one superblock... */
2268 md_super_wait(mddev
);
2269 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2271 spin_lock_irq(&mddev
->write_lock
);
2272 if (mddev
->in_sync
!= sync_req
||
2273 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2274 /* have to write it out again */
2275 spin_unlock_irq(&mddev
->write_lock
);
2278 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2279 spin_unlock_irq(&mddev
->write_lock
);
2280 wake_up(&mddev
->sb_wait
);
2281 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2282 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2286 /* words written to sysfs files may, or may not, be \n terminated.
2287 * We want to accept with case. For this we use cmd_match.
2289 static int cmd_match(const char *cmd
, const char *str
)
2291 /* See if cmd, written into a sysfs file, matches
2292 * str. They must either be the same, or cmd can
2293 * have a trailing newline
2295 while (*cmd
&& *str
&& *cmd
== *str
) {
2306 struct rdev_sysfs_entry
{
2307 struct attribute attr
;
2308 ssize_t (*show
)(mdk_rdev_t
*, char *);
2309 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2313 state_show(mdk_rdev_t
*rdev
, char *page
)
2318 if (test_bit(Faulty
, &rdev
->flags
)) {
2319 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2322 if (test_bit(In_sync
, &rdev
->flags
)) {
2323 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2326 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2327 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2330 if (test_bit(Blocked
, &rdev
->flags
)) {
2331 len
+= sprintf(page
+len
, "%sblocked", sep
);
2334 if (!test_bit(Faulty
, &rdev
->flags
) &&
2335 !test_bit(In_sync
, &rdev
->flags
)) {
2336 len
+= sprintf(page
+len
, "%sspare", sep
);
2339 return len
+sprintf(page
+len
, "\n");
2343 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2346 * faulty - simulates and error
2347 * remove - disconnects the device
2348 * writemostly - sets write_mostly
2349 * -writemostly - clears write_mostly
2350 * blocked - sets the Blocked flag
2351 * -blocked - clears the Blocked flag
2352 * insync - sets Insync providing device isn't active
2355 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2356 md_error(rdev
->mddev
, rdev
);
2358 } else if (cmd_match(buf
, "remove")) {
2359 if (rdev
->raid_disk
>= 0)
2362 mddev_t
*mddev
= rdev
->mddev
;
2363 kick_rdev_from_array(rdev
);
2365 md_update_sb(mddev
, 1);
2366 md_new_event(mddev
);
2369 } else if (cmd_match(buf
, "writemostly")) {
2370 set_bit(WriteMostly
, &rdev
->flags
);
2372 } else if (cmd_match(buf
, "-writemostly")) {
2373 clear_bit(WriteMostly
, &rdev
->flags
);
2375 } else if (cmd_match(buf
, "blocked")) {
2376 set_bit(Blocked
, &rdev
->flags
);
2378 } else if (cmd_match(buf
, "-blocked")) {
2379 clear_bit(Blocked
, &rdev
->flags
);
2380 wake_up(&rdev
->blocked_wait
);
2381 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2382 md_wakeup_thread(rdev
->mddev
->thread
);
2385 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2386 set_bit(In_sync
, &rdev
->flags
);
2390 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2391 return err
? err
: len
;
2393 static struct rdev_sysfs_entry rdev_state
=
2394 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2397 errors_show(mdk_rdev_t
*rdev
, char *page
)
2399 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2403 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2406 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2407 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2408 atomic_set(&rdev
->corrected_errors
, n
);
2413 static struct rdev_sysfs_entry rdev_errors
=
2414 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2417 slot_show(mdk_rdev_t
*rdev
, char *page
)
2419 if (rdev
->raid_disk
< 0)
2420 return sprintf(page
, "none\n");
2422 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2426 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2431 int slot
= simple_strtoul(buf
, &e
, 10);
2432 if (strncmp(buf
, "none", 4)==0)
2434 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2436 if (rdev
->mddev
->pers
&& slot
== -1) {
2437 /* Setting 'slot' on an active array requires also
2438 * updating the 'rd%d' link, and communicating
2439 * with the personality with ->hot_*_disk.
2440 * For now we only support removing
2441 * failed/spare devices. This normally happens automatically,
2442 * but not when the metadata is externally managed.
2444 if (rdev
->raid_disk
== -1)
2446 /* personality does all needed checks */
2447 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2449 err
= rdev
->mddev
->pers
->
2450 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2453 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2454 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2455 rdev
->raid_disk
= -1;
2456 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2457 md_wakeup_thread(rdev
->mddev
->thread
);
2458 } else if (rdev
->mddev
->pers
) {
2460 /* Activating a spare .. or possibly reactivating
2461 * if we ever get bitmaps working here.
2464 if (rdev
->raid_disk
!= -1)
2467 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2470 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2471 if (rdev2
->raid_disk
== slot
)
2474 rdev
->raid_disk
= slot
;
2475 if (test_bit(In_sync
, &rdev
->flags
))
2476 rdev
->saved_raid_disk
= slot
;
2478 rdev
->saved_raid_disk
= -1;
2479 err
= rdev
->mddev
->pers
->
2480 hot_add_disk(rdev
->mddev
, rdev
);
2482 rdev
->raid_disk
= -1;
2485 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2486 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2487 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2488 /* failure here is OK */;
2489 /* don't wakeup anyone, leave that to userspace. */
2491 if (slot
>= rdev
->mddev
->raid_disks
)
2493 rdev
->raid_disk
= slot
;
2494 /* assume it is working */
2495 clear_bit(Faulty
, &rdev
->flags
);
2496 clear_bit(WriteMostly
, &rdev
->flags
);
2497 set_bit(In_sync
, &rdev
->flags
);
2498 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2504 static struct rdev_sysfs_entry rdev_slot
=
2505 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2508 offset_show(mdk_rdev_t
*rdev
, char *page
)
2510 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2514 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2517 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2518 if (e
==buf
|| (*e
&& *e
!= '\n'))
2520 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2522 if (rdev
->sectors
&& rdev
->mddev
->external
)
2523 /* Must set offset before size, so overlap checks
2526 rdev
->data_offset
= offset
;
2530 static struct rdev_sysfs_entry rdev_offset
=
2531 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2534 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2536 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2539 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2541 /* check if two start/length pairs overlap */
2549 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2551 unsigned long long blocks
;
2554 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2557 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2558 return -EINVAL
; /* sector conversion overflow */
2561 if (new != blocks
* 2)
2562 return -EINVAL
; /* unsigned long long to sector_t overflow */
2569 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2571 mddev_t
*my_mddev
= rdev
->mddev
;
2572 sector_t oldsectors
= rdev
->sectors
;
2575 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2577 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2578 if (my_mddev
->persistent
) {
2579 sectors
= super_types
[my_mddev
->major_version
].
2580 rdev_size_change(rdev
, sectors
);
2583 } else if (!sectors
)
2584 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2587 if (sectors
< my_mddev
->dev_sectors
)
2588 return -EINVAL
; /* component must fit device */
2590 rdev
->sectors
= sectors
;
2591 if (sectors
> oldsectors
&& my_mddev
->external
) {
2592 /* need to check that all other rdevs with the same ->bdev
2593 * do not overlap. We need to unlock the mddev to avoid
2594 * a deadlock. We have already changed rdev->sectors, and if
2595 * we have to change it back, we will have the lock again.
2599 struct list_head
*tmp
;
2601 mddev_unlock(my_mddev
);
2602 for_each_mddev(mddev
, tmp
) {
2606 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2607 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2608 (rdev
->bdev
== rdev2
->bdev
&&
2610 overlaps(rdev
->data_offset
, rdev
->sectors
,
2616 mddev_unlock(mddev
);
2622 mddev_lock(my_mddev
);
2624 /* Someone else could have slipped in a size
2625 * change here, but doing so is just silly.
2626 * We put oldsectors back because we *know* it is
2627 * safe, and trust userspace not to race with
2630 rdev
->sectors
= oldsectors
;
2637 static struct rdev_sysfs_entry rdev_size
=
2638 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2641 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2643 unsigned long long recovery_start
= rdev
->recovery_offset
;
2645 if (test_bit(In_sync
, &rdev
->flags
) ||
2646 recovery_start
== MaxSector
)
2647 return sprintf(page
, "none\n");
2649 return sprintf(page
, "%llu\n", recovery_start
);
2652 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2654 unsigned long long recovery_start
;
2656 if (cmd_match(buf
, "none"))
2657 recovery_start
= MaxSector
;
2658 else if (strict_strtoull(buf
, 10, &recovery_start
))
2661 if (rdev
->mddev
->pers
&&
2662 rdev
->raid_disk
>= 0)
2665 rdev
->recovery_offset
= recovery_start
;
2666 if (recovery_start
== MaxSector
)
2667 set_bit(In_sync
, &rdev
->flags
);
2669 clear_bit(In_sync
, &rdev
->flags
);
2673 static struct rdev_sysfs_entry rdev_recovery_start
=
2674 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2676 static struct attribute
*rdev_default_attrs
[] = {
2682 &rdev_recovery_start
.attr
,
2686 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2688 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2689 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2690 mddev_t
*mddev
= rdev
->mddev
;
2696 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2698 if (rdev
->mddev
== NULL
)
2701 rv
= entry
->show(rdev
, page
);
2702 mddev_unlock(mddev
);
2708 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2709 const char *page
, size_t length
)
2711 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2712 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2714 mddev_t
*mddev
= rdev
->mddev
;
2718 if (!capable(CAP_SYS_ADMIN
))
2720 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2722 if (rdev
->mddev
== NULL
)
2725 rv
= entry
->store(rdev
, page
, length
);
2726 mddev_unlock(mddev
);
2731 static void rdev_free(struct kobject
*ko
)
2733 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2736 static const struct sysfs_ops rdev_sysfs_ops
= {
2737 .show
= rdev_attr_show
,
2738 .store
= rdev_attr_store
,
2740 static struct kobj_type rdev_ktype
= {
2741 .release
= rdev_free
,
2742 .sysfs_ops
= &rdev_sysfs_ops
,
2743 .default_attrs
= rdev_default_attrs
,
2746 void md_rdev_init(mdk_rdev_t
*rdev
)
2749 rdev
->saved_raid_disk
= -1;
2750 rdev
->raid_disk
= -1;
2752 rdev
->data_offset
= 0;
2753 rdev
->sb_events
= 0;
2754 rdev
->last_read_error
.tv_sec
= 0;
2755 rdev
->last_read_error
.tv_nsec
= 0;
2756 atomic_set(&rdev
->nr_pending
, 0);
2757 atomic_set(&rdev
->read_errors
, 0);
2758 atomic_set(&rdev
->corrected_errors
, 0);
2760 INIT_LIST_HEAD(&rdev
->same_set
);
2761 init_waitqueue_head(&rdev
->blocked_wait
);
2763 EXPORT_SYMBOL_GPL(md_rdev_init
);
2765 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2767 * mark the device faulty if:
2769 * - the device is nonexistent (zero size)
2770 * - the device has no valid superblock
2772 * a faulty rdev _never_ has rdev->sb set.
2774 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2776 char b
[BDEVNAME_SIZE
];
2781 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2783 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2784 return ERR_PTR(-ENOMEM
);
2788 if ((err
= alloc_disk_sb(rdev
)))
2791 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2795 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2797 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2800 "md: %s has zero or unknown size, marking faulty!\n",
2801 bdevname(rdev
->bdev
,b
));
2806 if (super_format
>= 0) {
2807 err
= super_types
[super_format
].
2808 load_super(rdev
, NULL
, super_minor
);
2809 if (err
== -EINVAL
) {
2811 "md: %s does not have a valid v%d.%d "
2812 "superblock, not importing!\n",
2813 bdevname(rdev
->bdev
,b
),
2814 super_format
, super_minor
);
2819 "md: could not read %s's sb, not importing!\n",
2820 bdevname(rdev
->bdev
,b
));
2828 if (rdev
->sb_page
) {
2834 return ERR_PTR(err
);
2838 * Check a full RAID array for plausibility
2842 static void analyze_sbs(mddev_t
* mddev
)
2845 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2846 char b
[BDEVNAME_SIZE
];
2849 rdev_for_each(rdev
, tmp
, mddev
)
2850 switch (super_types
[mddev
->major_version
].
2851 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2859 "md: fatal superblock inconsistency in %s"
2860 " -- removing from array\n",
2861 bdevname(rdev
->bdev
,b
));
2862 kick_rdev_from_array(rdev
);
2866 super_types
[mddev
->major_version
].
2867 validate_super(mddev
, freshest
);
2870 rdev_for_each(rdev
, tmp
, mddev
) {
2871 if (mddev
->max_disks
&&
2872 (rdev
->desc_nr
>= mddev
->max_disks
||
2873 i
> mddev
->max_disks
)) {
2875 "md: %s: %s: only %d devices permitted\n",
2876 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2878 kick_rdev_from_array(rdev
);
2881 if (rdev
!= freshest
)
2882 if (super_types
[mddev
->major_version
].
2883 validate_super(mddev
, rdev
)) {
2884 printk(KERN_WARNING
"md: kicking non-fresh %s"
2886 bdevname(rdev
->bdev
,b
));
2887 kick_rdev_from_array(rdev
);
2890 if (mddev
->level
== LEVEL_MULTIPATH
) {
2891 rdev
->desc_nr
= i
++;
2892 rdev
->raid_disk
= rdev
->desc_nr
;
2893 set_bit(In_sync
, &rdev
->flags
);
2894 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2895 rdev
->raid_disk
= -1;
2896 clear_bit(In_sync
, &rdev
->flags
);
2901 /* Read a fixed-point number.
2902 * Numbers in sysfs attributes should be in "standard" units where
2903 * possible, so time should be in seconds.
2904 * However we internally use a a much smaller unit such as
2905 * milliseconds or jiffies.
2906 * This function takes a decimal number with a possible fractional
2907 * component, and produces an integer which is the result of
2908 * multiplying that number by 10^'scale'.
2909 * all without any floating-point arithmetic.
2911 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2913 unsigned long result
= 0;
2915 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2918 else if (decimals
< scale
) {
2921 result
= result
* 10 + value
;
2933 while (decimals
< scale
) {
2942 static void md_safemode_timeout(unsigned long data
);
2945 safe_delay_show(mddev_t
*mddev
, char *page
)
2947 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2948 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2951 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2955 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2958 mddev
->safemode_delay
= 0;
2960 unsigned long old_delay
= mddev
->safemode_delay
;
2961 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2962 if (mddev
->safemode_delay
== 0)
2963 mddev
->safemode_delay
= 1;
2964 if (mddev
->safemode_delay
< old_delay
)
2965 md_safemode_timeout((unsigned long)mddev
);
2969 static struct md_sysfs_entry md_safe_delay
=
2970 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2973 level_show(mddev_t
*mddev
, char *page
)
2975 struct mdk_personality
*p
= mddev
->pers
;
2977 return sprintf(page
, "%s\n", p
->name
);
2978 else if (mddev
->clevel
[0])
2979 return sprintf(page
, "%s\n", mddev
->clevel
);
2980 else if (mddev
->level
!= LEVEL_NONE
)
2981 return sprintf(page
, "%d\n", mddev
->level
);
2987 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2991 struct mdk_personality
*pers
;
2996 if (mddev
->pers
== NULL
) {
2999 if (len
>= sizeof(mddev
->clevel
))
3001 strncpy(mddev
->clevel
, buf
, len
);
3002 if (mddev
->clevel
[len
-1] == '\n')
3004 mddev
->clevel
[len
] = 0;
3005 mddev
->level
= LEVEL_NONE
;
3009 /* request to change the personality. Need to ensure:
3010 * - array is not engaged in resync/recovery/reshape
3011 * - old personality can be suspended
3012 * - new personality will access other array.
3015 if (mddev
->sync_thread
||
3016 mddev
->reshape_position
!= MaxSector
||
3017 mddev
->sysfs_active
)
3020 if (!mddev
->pers
->quiesce
) {
3021 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3022 mdname(mddev
), mddev
->pers
->name
);
3026 /* Now find the new personality */
3027 if (len
== 0 || len
>= sizeof(clevel
))
3029 strncpy(clevel
, buf
, len
);
3030 if (clevel
[len
-1] == '\n')
3033 if (strict_strtol(clevel
, 10, &level
))
3036 if (request_module("md-%s", clevel
) != 0)
3037 request_module("md-level-%s", clevel
);
3038 spin_lock(&pers_lock
);
3039 pers
= find_pers(level
, clevel
);
3040 if (!pers
|| !try_module_get(pers
->owner
)) {
3041 spin_unlock(&pers_lock
);
3042 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3045 spin_unlock(&pers_lock
);
3047 if (pers
== mddev
->pers
) {
3048 /* Nothing to do! */
3049 module_put(pers
->owner
);
3052 if (!pers
->takeover
) {
3053 module_put(pers
->owner
);
3054 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3055 mdname(mddev
), clevel
);
3059 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3060 rdev
->new_raid_disk
= rdev
->raid_disk
;
3062 /* ->takeover must set new_* and/or delta_disks
3063 * if it succeeds, and may set them when it fails.
3065 priv
= pers
->takeover(mddev
);
3067 mddev
->new_level
= mddev
->level
;
3068 mddev
->new_layout
= mddev
->layout
;
3069 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3070 mddev
->raid_disks
-= mddev
->delta_disks
;
3071 mddev
->delta_disks
= 0;
3072 module_put(pers
->owner
);
3073 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3074 mdname(mddev
), clevel
);
3075 return PTR_ERR(priv
);
3078 /* Looks like we have a winner */
3079 mddev_suspend(mddev
);
3080 mddev
->pers
->stop(mddev
);
3082 if (mddev
->pers
->sync_request
== NULL
&&
3083 pers
->sync_request
!= NULL
) {
3084 /* need to add the md_redundancy_group */
3085 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3087 "md: cannot register extra attributes for %s\n",
3089 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3091 if (mddev
->pers
->sync_request
!= NULL
&&
3092 pers
->sync_request
== NULL
) {
3093 /* need to remove the md_redundancy_group */
3094 if (mddev
->to_remove
== NULL
)
3095 mddev
->to_remove
= &md_redundancy_group
;
3098 if (mddev
->pers
->sync_request
== NULL
&&
3100 /* We are converting from a no-redundancy array
3101 * to a redundancy array and metadata is managed
3102 * externally so we need to be sure that writes
3103 * won't block due to a need to transition
3105 * until external management is started.
3108 mddev
->safemode_delay
= 0;
3109 mddev
->safemode
= 0;
3112 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3114 if (rdev
->raid_disk
< 0)
3116 if (rdev
->new_raid_disk
> mddev
->raid_disks
)
3117 rdev
->new_raid_disk
= -1;
3118 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3120 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3121 sysfs_remove_link(&mddev
->kobj
, nm
);
3123 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3124 if (rdev
->raid_disk
< 0)
3126 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3128 rdev
->raid_disk
= rdev
->new_raid_disk
;
3129 if (rdev
->raid_disk
< 0)
3130 clear_bit(In_sync
, &rdev
->flags
);
3133 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3134 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3135 printk("md: cannot register %s for %s after level change\n",
3140 module_put(mddev
->pers
->owner
);
3142 mddev
->private = priv
;
3143 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3144 mddev
->level
= mddev
->new_level
;
3145 mddev
->layout
= mddev
->new_layout
;
3146 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3147 mddev
->delta_disks
= 0;
3148 if (mddev
->pers
->sync_request
== NULL
) {
3149 /* this is now an array without redundancy, so
3150 * it must always be in_sync
3153 del_timer_sync(&mddev
->safemode_timer
);
3156 mddev_resume(mddev
);
3157 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3158 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3159 md_wakeup_thread(mddev
->thread
);
3160 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3161 md_new_event(mddev
);
3165 static struct md_sysfs_entry md_level
=
3166 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3170 layout_show(mddev_t
*mddev
, char *page
)
3172 /* just a number, not meaningful for all levels */
3173 if (mddev
->reshape_position
!= MaxSector
&&
3174 mddev
->layout
!= mddev
->new_layout
)
3175 return sprintf(page
, "%d (%d)\n",
3176 mddev
->new_layout
, mddev
->layout
);
3177 return sprintf(page
, "%d\n", mddev
->layout
);
3181 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3184 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3186 if (!*buf
|| (*e
&& *e
!= '\n'))
3191 if (mddev
->pers
->check_reshape
== NULL
)
3193 mddev
->new_layout
= n
;
3194 err
= mddev
->pers
->check_reshape(mddev
);
3196 mddev
->new_layout
= mddev
->layout
;
3200 mddev
->new_layout
= n
;
3201 if (mddev
->reshape_position
== MaxSector
)
3206 static struct md_sysfs_entry md_layout
=
3207 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3211 raid_disks_show(mddev_t
*mddev
, char *page
)
3213 if (mddev
->raid_disks
== 0)
3215 if (mddev
->reshape_position
!= MaxSector
&&
3216 mddev
->delta_disks
!= 0)
3217 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3218 mddev
->raid_disks
- mddev
->delta_disks
);
3219 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3222 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3225 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3229 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3231 if (!*buf
|| (*e
&& *e
!= '\n'))
3235 rv
= update_raid_disks(mddev
, n
);
3236 else if (mddev
->reshape_position
!= MaxSector
) {
3237 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3238 mddev
->delta_disks
= n
- olddisks
;
3239 mddev
->raid_disks
= n
;
3241 mddev
->raid_disks
= n
;
3242 return rv
? rv
: len
;
3244 static struct md_sysfs_entry md_raid_disks
=
3245 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3248 chunk_size_show(mddev_t
*mddev
, char *page
)
3250 if (mddev
->reshape_position
!= MaxSector
&&
3251 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3252 return sprintf(page
, "%d (%d)\n",
3253 mddev
->new_chunk_sectors
<< 9,
3254 mddev
->chunk_sectors
<< 9);
3255 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3259 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3262 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3264 if (!*buf
|| (*e
&& *e
!= '\n'))
3269 if (mddev
->pers
->check_reshape
== NULL
)
3271 mddev
->new_chunk_sectors
= n
>> 9;
3272 err
= mddev
->pers
->check_reshape(mddev
);
3274 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3278 mddev
->new_chunk_sectors
= n
>> 9;
3279 if (mddev
->reshape_position
== MaxSector
)
3280 mddev
->chunk_sectors
= n
>> 9;
3284 static struct md_sysfs_entry md_chunk_size
=
3285 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3288 resync_start_show(mddev_t
*mddev
, char *page
)
3290 if (mddev
->recovery_cp
== MaxSector
)
3291 return sprintf(page
, "none\n");
3292 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3296 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3299 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3303 if (cmd_match(buf
, "none"))
3305 else if (!*buf
|| (*e
&& *e
!= '\n'))
3308 mddev
->recovery_cp
= n
;
3311 static struct md_sysfs_entry md_resync_start
=
3312 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3315 * The array state can be:
3318 * No devices, no size, no level
3319 * Equivalent to STOP_ARRAY ioctl
3321 * May have some settings, but array is not active
3322 * all IO results in error
3323 * When written, doesn't tear down array, but just stops it
3324 * suspended (not supported yet)
3325 * All IO requests will block. The array can be reconfigured.
3326 * Writing this, if accepted, will block until array is quiescent
3328 * no resync can happen. no superblocks get written.
3329 * write requests fail
3331 * like readonly, but behaves like 'clean' on a write request.
3333 * clean - no pending writes, but otherwise active.
3334 * When written to inactive array, starts without resync
3335 * If a write request arrives then
3336 * if metadata is known, mark 'dirty' and switch to 'active'.
3337 * if not known, block and switch to write-pending
3338 * If written to an active array that has pending writes, then fails.
3340 * fully active: IO and resync can be happening.
3341 * When written to inactive array, starts with resync
3344 * clean, but writes are blocked waiting for 'active' to be written.
3347 * like active, but no writes have been seen for a while (100msec).
3350 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3351 write_pending
, active_idle
, bad_word
};
3352 static char *array_states
[] = {
3353 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3354 "write-pending", "active-idle", NULL
};
3356 static int match_word(const char *word
, char **list
)
3359 for (n
=0; list
[n
]; n
++)
3360 if (cmd_match(word
, list
[n
]))
3366 array_state_show(mddev_t
*mddev
, char *page
)
3368 enum array_state st
= inactive
;
3381 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
3383 else if (mddev
->safemode
)
3389 if (list_empty(&mddev
->disks
) &&
3390 mddev
->raid_disks
== 0 &&
3391 mddev
->dev_sectors
== 0)
3396 return sprintf(page
, "%s\n", array_states
[st
]);
3399 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3400 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3401 static int do_md_run(mddev_t
* mddev
);
3402 static int restart_array(mddev_t
*mddev
);
3405 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3408 enum array_state st
= match_word(buf
, array_states
);
3413 /* stopping an active array */
3414 if (atomic_read(&mddev
->openers
) > 0)
3416 err
= do_md_stop(mddev
, 0, 0);
3419 /* stopping an active array */
3421 if (atomic_read(&mddev
->openers
) > 0)
3423 err
= do_md_stop(mddev
, 2, 0);
3425 err
= 0; /* already inactive */
3428 break; /* not supported yet */
3431 err
= md_set_readonly(mddev
, 0);
3434 set_disk_ro(mddev
->gendisk
, 1);
3435 err
= do_md_run(mddev
);
3441 err
= md_set_readonly(mddev
, 0);
3442 else if (mddev
->ro
== 1)
3443 err
= restart_array(mddev
);
3446 set_disk_ro(mddev
->gendisk
, 0);
3450 err
= do_md_run(mddev
);
3455 restart_array(mddev
);
3456 spin_lock_irq(&mddev
->write_lock
);
3457 if (atomic_read(&mddev
->writes_pending
) == 0) {
3458 if (mddev
->in_sync
== 0) {
3460 if (mddev
->safemode
== 1)
3461 mddev
->safemode
= 0;
3462 if (mddev
->persistent
)
3463 set_bit(MD_CHANGE_CLEAN
,
3469 spin_unlock_irq(&mddev
->write_lock
);
3475 restart_array(mddev
);
3476 if (mddev
->external
)
3477 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3478 wake_up(&mddev
->sb_wait
);
3482 set_disk_ro(mddev
->gendisk
, 0);
3483 err
= do_md_run(mddev
);
3488 /* these cannot be set */
3494 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3498 static struct md_sysfs_entry md_array_state
=
3499 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3502 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3503 return sprintf(page
, "%d\n",
3504 atomic_read(&mddev
->max_corr_read_errors
));
3508 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3511 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3513 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3514 atomic_set(&mddev
->max_corr_read_errors
, n
);
3520 static struct md_sysfs_entry max_corr_read_errors
=
3521 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3522 max_corrected_read_errors_store
);
3525 null_show(mddev_t
*mddev
, char *page
)
3531 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3533 /* buf must be %d:%d\n? giving major and minor numbers */
3534 /* The new device is added to the array.
3535 * If the array has a persistent superblock, we read the
3536 * superblock to initialise info and check validity.
3537 * Otherwise, only checking done is that in bind_rdev_to_array,
3538 * which mainly checks size.
3541 int major
= simple_strtoul(buf
, &e
, 10);
3547 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3549 minor
= simple_strtoul(e
+1, &e
, 10);
3550 if (*e
&& *e
!= '\n')
3552 dev
= MKDEV(major
, minor
);
3553 if (major
!= MAJOR(dev
) ||
3554 minor
!= MINOR(dev
))
3558 if (mddev
->persistent
) {
3559 rdev
= md_import_device(dev
, mddev
->major_version
,
3560 mddev
->minor_version
);
3561 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3562 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3563 mdk_rdev_t
, same_set
);
3564 err
= super_types
[mddev
->major_version
]
3565 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3569 } else if (mddev
->external
)
3570 rdev
= md_import_device(dev
, -2, -1);
3572 rdev
= md_import_device(dev
, -1, -1);
3575 return PTR_ERR(rdev
);
3576 err
= bind_rdev_to_array(rdev
, mddev
);
3580 return err
? err
: len
;
3583 static struct md_sysfs_entry md_new_device
=
3584 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3587 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3590 unsigned long chunk
, end_chunk
;
3594 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3596 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3597 if (buf
== end
) break;
3598 if (*end
== '-') { /* range */
3600 end_chunk
= simple_strtoul(buf
, &end
, 0);
3601 if (buf
== end
) break;
3603 if (*end
&& !isspace(*end
)) break;
3604 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3605 buf
= skip_spaces(end
);
3607 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3612 static struct md_sysfs_entry md_bitmap
=
3613 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3616 size_show(mddev_t
*mddev
, char *page
)
3618 return sprintf(page
, "%llu\n",
3619 (unsigned long long)mddev
->dev_sectors
/ 2);
3622 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3625 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3627 /* If array is inactive, we can reduce the component size, but
3628 * not increase it (except from 0).
3629 * If array is active, we can try an on-line resize
3632 int err
= strict_blocks_to_sectors(buf
, §ors
);
3637 err
= update_size(mddev
, sectors
);
3638 md_update_sb(mddev
, 1);
3640 if (mddev
->dev_sectors
== 0 ||
3641 mddev
->dev_sectors
> sectors
)
3642 mddev
->dev_sectors
= sectors
;
3646 return err
? err
: len
;
3649 static struct md_sysfs_entry md_size
=
3650 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3655 * 'none' for arrays with no metadata (good luck...)
3656 * 'external' for arrays with externally managed metadata,
3657 * or N.M for internally known formats
3660 metadata_show(mddev_t
*mddev
, char *page
)
3662 if (mddev
->persistent
)
3663 return sprintf(page
, "%d.%d\n",
3664 mddev
->major_version
, mddev
->minor_version
);
3665 else if (mddev
->external
)
3666 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3668 return sprintf(page
, "none\n");
3672 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3676 /* Changing the details of 'external' metadata is
3677 * always permitted. Otherwise there must be
3678 * no devices attached to the array.
3680 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3682 else if (!list_empty(&mddev
->disks
))
3685 if (cmd_match(buf
, "none")) {
3686 mddev
->persistent
= 0;
3687 mddev
->external
= 0;
3688 mddev
->major_version
= 0;
3689 mddev
->minor_version
= 90;
3692 if (strncmp(buf
, "external:", 9) == 0) {
3693 size_t namelen
= len
-9;
3694 if (namelen
>= sizeof(mddev
->metadata_type
))
3695 namelen
= sizeof(mddev
->metadata_type
)-1;
3696 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3697 mddev
->metadata_type
[namelen
] = 0;
3698 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3699 mddev
->metadata_type
[--namelen
] = 0;
3700 mddev
->persistent
= 0;
3701 mddev
->external
= 1;
3702 mddev
->major_version
= 0;
3703 mddev
->minor_version
= 90;
3706 major
= simple_strtoul(buf
, &e
, 10);
3707 if (e
==buf
|| *e
!= '.')
3710 minor
= simple_strtoul(buf
, &e
, 10);
3711 if (e
==buf
|| (*e
&& *e
!= '\n') )
3713 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3715 mddev
->major_version
= major
;
3716 mddev
->minor_version
= minor
;
3717 mddev
->persistent
= 1;
3718 mddev
->external
= 0;
3722 static struct md_sysfs_entry md_metadata
=
3723 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3726 action_show(mddev_t
*mddev
, char *page
)
3728 char *type
= "idle";
3729 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3731 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3732 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3733 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3735 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3736 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3738 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3742 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3745 return sprintf(page
, "%s\n", type
);
3749 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3751 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3754 if (cmd_match(page
, "frozen"))
3755 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3757 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3759 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3760 if (mddev
->sync_thread
) {
3761 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3762 md_unregister_thread(mddev
->sync_thread
);
3763 mddev
->sync_thread
= NULL
;
3764 mddev
->recovery
= 0;
3766 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3767 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3769 else if (cmd_match(page
, "resync"))
3770 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3771 else if (cmd_match(page
, "recover")) {
3772 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3773 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3774 } else if (cmd_match(page
, "reshape")) {
3776 if (mddev
->pers
->start_reshape
== NULL
)
3778 err
= mddev
->pers
->start_reshape(mddev
);
3781 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3783 if (cmd_match(page
, "check"))
3784 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3785 else if (!cmd_match(page
, "repair"))
3787 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3788 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3790 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3791 md_wakeup_thread(mddev
->thread
);
3792 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3797 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3799 return sprintf(page
, "%llu\n",
3800 (unsigned long long) mddev
->resync_mismatches
);
3803 static struct md_sysfs_entry md_scan_mode
=
3804 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3807 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3810 sync_min_show(mddev_t
*mddev
, char *page
)
3812 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3813 mddev
->sync_speed_min
? "local": "system");
3817 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3821 if (strncmp(buf
, "system", 6)==0) {
3822 mddev
->sync_speed_min
= 0;
3825 min
= simple_strtoul(buf
, &e
, 10);
3826 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3828 mddev
->sync_speed_min
= min
;
3832 static struct md_sysfs_entry md_sync_min
=
3833 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3836 sync_max_show(mddev_t
*mddev
, char *page
)
3838 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3839 mddev
->sync_speed_max
? "local": "system");
3843 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3847 if (strncmp(buf
, "system", 6)==0) {
3848 mddev
->sync_speed_max
= 0;
3851 max
= simple_strtoul(buf
, &e
, 10);
3852 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3854 mddev
->sync_speed_max
= max
;
3858 static struct md_sysfs_entry md_sync_max
=
3859 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3862 degraded_show(mddev_t
*mddev
, char *page
)
3864 return sprintf(page
, "%d\n", mddev
->degraded
);
3866 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3869 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3871 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3875 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3879 if (strict_strtol(buf
, 10, &n
))
3882 if (n
!= 0 && n
!= 1)
3885 mddev
->parallel_resync
= n
;
3887 if (mddev
->sync_thread
)
3888 wake_up(&resync_wait
);
3893 /* force parallel resync, even with shared block devices */
3894 static struct md_sysfs_entry md_sync_force_parallel
=
3895 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3896 sync_force_parallel_show
, sync_force_parallel_store
);
3899 sync_speed_show(mddev_t
*mddev
, char *page
)
3901 unsigned long resync
, dt
, db
;
3902 if (mddev
->curr_resync
== 0)
3903 return sprintf(page
, "none\n");
3904 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3905 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3907 db
= resync
- mddev
->resync_mark_cnt
;
3908 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3911 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3914 sync_completed_show(mddev_t
*mddev
, char *page
)
3916 unsigned long max_sectors
, resync
;
3918 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3919 return sprintf(page
, "none\n");
3921 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3922 max_sectors
= mddev
->resync_max_sectors
;
3924 max_sectors
= mddev
->dev_sectors
;
3926 resync
= mddev
->curr_resync_completed
;
3927 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3930 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3933 min_sync_show(mddev_t
*mddev
, char *page
)
3935 return sprintf(page
, "%llu\n",
3936 (unsigned long long)mddev
->resync_min
);
3939 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3941 unsigned long long min
;
3942 if (strict_strtoull(buf
, 10, &min
))
3944 if (min
> mddev
->resync_max
)
3946 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3949 /* Must be a multiple of chunk_size */
3950 if (mddev
->chunk_sectors
) {
3951 sector_t temp
= min
;
3952 if (sector_div(temp
, mddev
->chunk_sectors
))
3955 mddev
->resync_min
= min
;
3960 static struct md_sysfs_entry md_min_sync
=
3961 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3964 max_sync_show(mddev_t
*mddev
, char *page
)
3966 if (mddev
->resync_max
== MaxSector
)
3967 return sprintf(page
, "max\n");
3969 return sprintf(page
, "%llu\n",
3970 (unsigned long long)mddev
->resync_max
);
3973 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3975 if (strncmp(buf
, "max", 3) == 0)
3976 mddev
->resync_max
= MaxSector
;
3978 unsigned long long max
;
3979 if (strict_strtoull(buf
, 10, &max
))
3981 if (max
< mddev
->resync_min
)
3983 if (max
< mddev
->resync_max
&&
3985 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3988 /* Must be a multiple of chunk_size */
3989 if (mddev
->chunk_sectors
) {
3990 sector_t temp
= max
;
3991 if (sector_div(temp
, mddev
->chunk_sectors
))
3994 mddev
->resync_max
= max
;
3996 wake_up(&mddev
->recovery_wait
);
4000 static struct md_sysfs_entry md_max_sync
=
4001 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4004 suspend_lo_show(mddev_t
*mddev
, char *page
)
4006 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4010 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4013 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4015 if (mddev
->pers
== NULL
||
4016 mddev
->pers
->quiesce
== NULL
)
4018 if (buf
== e
|| (*e
&& *e
!= '\n'))
4020 if (new >= mddev
->suspend_hi
||
4021 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
4022 mddev
->suspend_lo
= new;
4023 mddev
->pers
->quiesce(mddev
, 2);
4028 static struct md_sysfs_entry md_suspend_lo
=
4029 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4033 suspend_hi_show(mddev_t
*mddev
, char *page
)
4035 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4039 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4042 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4044 if (mddev
->pers
== NULL
||
4045 mddev
->pers
->quiesce
== NULL
)
4047 if (buf
== e
|| (*e
&& *e
!= '\n'))
4049 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
4050 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
4051 mddev
->suspend_hi
= new;
4052 mddev
->pers
->quiesce(mddev
, 1);
4053 mddev
->pers
->quiesce(mddev
, 0);
4058 static struct md_sysfs_entry md_suspend_hi
=
4059 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4062 reshape_position_show(mddev_t
*mddev
, char *page
)
4064 if (mddev
->reshape_position
!= MaxSector
)
4065 return sprintf(page
, "%llu\n",
4066 (unsigned long long)mddev
->reshape_position
);
4067 strcpy(page
, "none\n");
4072 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4075 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4078 if (buf
== e
|| (*e
&& *e
!= '\n'))
4080 mddev
->reshape_position
= new;
4081 mddev
->delta_disks
= 0;
4082 mddev
->new_level
= mddev
->level
;
4083 mddev
->new_layout
= mddev
->layout
;
4084 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4088 static struct md_sysfs_entry md_reshape_position
=
4089 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4090 reshape_position_store
);
4093 array_size_show(mddev_t
*mddev
, char *page
)
4095 if (mddev
->external_size
)
4096 return sprintf(page
, "%llu\n",
4097 (unsigned long long)mddev
->array_sectors
/2);
4099 return sprintf(page
, "default\n");
4103 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4107 if (strncmp(buf
, "default", 7) == 0) {
4109 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4111 sectors
= mddev
->array_sectors
;
4113 mddev
->external_size
= 0;
4115 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4117 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4120 mddev
->external_size
= 1;
4123 mddev
->array_sectors
= sectors
;
4124 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4126 revalidate_disk(mddev
->gendisk
);
4131 static struct md_sysfs_entry md_array_size
=
4132 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4135 static struct attribute
*md_default_attrs
[] = {
4138 &md_raid_disks
.attr
,
4139 &md_chunk_size
.attr
,
4141 &md_resync_start
.attr
,
4143 &md_new_device
.attr
,
4144 &md_safe_delay
.attr
,
4145 &md_array_state
.attr
,
4146 &md_reshape_position
.attr
,
4147 &md_array_size
.attr
,
4148 &max_corr_read_errors
.attr
,
4152 static struct attribute
*md_redundancy_attrs
[] = {
4154 &md_mismatches
.attr
,
4157 &md_sync_speed
.attr
,
4158 &md_sync_force_parallel
.attr
,
4159 &md_sync_completed
.attr
,
4162 &md_suspend_lo
.attr
,
4163 &md_suspend_hi
.attr
,
4168 static struct attribute_group md_redundancy_group
= {
4170 .attrs
= md_redundancy_attrs
,
4175 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4177 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4178 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4183 rv
= mddev_lock(mddev
);
4185 rv
= entry
->show(mddev
, page
);
4186 mddev_unlock(mddev
);
4192 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4193 const char *page
, size_t length
)
4195 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4196 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4201 if (!capable(CAP_SYS_ADMIN
))
4203 rv
= mddev_lock(mddev
);
4204 if (mddev
->hold_active
== UNTIL_IOCTL
)
4205 mddev
->hold_active
= 0;
4207 rv
= entry
->store(mddev
, page
, length
);
4208 mddev_unlock(mddev
);
4213 static void md_free(struct kobject
*ko
)
4215 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4217 if (mddev
->sysfs_state
)
4218 sysfs_put(mddev
->sysfs_state
);
4220 if (mddev
->gendisk
) {
4221 del_gendisk(mddev
->gendisk
);
4222 put_disk(mddev
->gendisk
);
4225 blk_cleanup_queue(mddev
->queue
);
4230 static const struct sysfs_ops md_sysfs_ops
= {
4231 .show
= md_attr_show
,
4232 .store
= md_attr_store
,
4234 static struct kobj_type md_ktype
= {
4236 .sysfs_ops
= &md_sysfs_ops
,
4237 .default_attrs
= md_default_attrs
,
4242 static void mddev_delayed_delete(struct work_struct
*ws
)
4244 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4246 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4247 kobject_del(&mddev
->kobj
);
4248 kobject_put(&mddev
->kobj
);
4251 static int md_alloc(dev_t dev
, char *name
)
4253 static DEFINE_MUTEX(disks_mutex
);
4254 mddev_t
*mddev
= mddev_find(dev
);
4255 struct gendisk
*disk
;
4264 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4265 shift
= partitioned
? MdpMinorShift
: 0;
4266 unit
= MINOR(mddev
->unit
) >> shift
;
4268 /* wait for any previous instance if this device
4269 * to be completed removed (mddev_delayed_delete).
4271 flush_scheduled_work();
4273 mutex_lock(&disks_mutex
);
4279 /* Need to ensure that 'name' is not a duplicate.
4282 spin_lock(&all_mddevs_lock
);
4284 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4285 if (mddev2
->gendisk
&&
4286 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4287 spin_unlock(&all_mddevs_lock
);
4290 spin_unlock(&all_mddevs_lock
);
4294 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4297 mddev
->queue
->queuedata
= mddev
;
4299 /* Can be unlocked because the queue is new: no concurrency */
4300 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
4302 blk_queue_make_request(mddev
->queue
, md_make_request
);
4304 disk
= alloc_disk(1 << shift
);
4306 blk_cleanup_queue(mddev
->queue
);
4307 mddev
->queue
= NULL
;
4310 disk
->major
= MAJOR(mddev
->unit
);
4311 disk
->first_minor
= unit
<< shift
;
4313 strcpy(disk
->disk_name
, name
);
4314 else if (partitioned
)
4315 sprintf(disk
->disk_name
, "md_d%d", unit
);
4317 sprintf(disk
->disk_name
, "md%d", unit
);
4318 disk
->fops
= &md_fops
;
4319 disk
->private_data
= mddev
;
4320 disk
->queue
= mddev
->queue
;
4321 /* Allow extended partitions. This makes the
4322 * 'mdp' device redundant, but we can't really
4325 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4327 mddev
->gendisk
= disk
;
4328 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4329 &disk_to_dev(disk
)->kobj
, "%s", "md");
4331 /* This isn't possible, but as kobject_init_and_add is marked
4332 * __must_check, we must do something with the result
4334 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4338 if (mddev
->kobj
.sd
&&
4339 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4340 printk(KERN_DEBUG
"pointless warning\n");
4342 mutex_unlock(&disks_mutex
);
4343 if (!error
&& mddev
->kobj
.sd
) {
4344 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4345 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4351 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4353 md_alloc(dev
, NULL
);
4357 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4359 /* val must be "md_*" where * is not all digits.
4360 * We allocate an array with a large free minor number, and
4361 * set the name to val. val must not already be an active name.
4363 int len
= strlen(val
);
4364 char buf
[DISK_NAME_LEN
];
4366 while (len
&& val
[len
-1] == '\n')
4368 if (len
>= DISK_NAME_LEN
)
4370 strlcpy(buf
, val
, len
+1);
4371 if (strncmp(buf
, "md_", 3) != 0)
4373 return md_alloc(0, buf
);
4376 static void md_safemode_timeout(unsigned long data
)
4378 mddev_t
*mddev
= (mddev_t
*) data
;
4380 if (!atomic_read(&mddev
->writes_pending
)) {
4381 mddev
->safemode
= 1;
4382 if (mddev
->external
)
4383 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4385 md_wakeup_thread(mddev
->thread
);
4388 static int start_dirty_degraded
;
4390 int md_run(mddev_t
*mddev
)
4394 struct mdk_personality
*pers
;
4396 if (list_empty(&mddev
->disks
))
4397 /* cannot run an array with no devices.. */
4402 /* Cannot run until previous stop completes properly */
4403 if (mddev
->sysfs_active
)
4407 * Analyze all RAID superblock(s)
4409 if (!mddev
->raid_disks
) {
4410 if (!mddev
->persistent
)
4415 if (mddev
->level
!= LEVEL_NONE
)
4416 request_module("md-level-%d", mddev
->level
);
4417 else if (mddev
->clevel
[0])
4418 request_module("md-%s", mddev
->clevel
);
4421 * Drop all container device buffers, from now on
4422 * the only valid external interface is through the md
4425 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4426 if (test_bit(Faulty
, &rdev
->flags
))
4428 sync_blockdev(rdev
->bdev
);
4429 invalidate_bdev(rdev
->bdev
);
4431 /* perform some consistency tests on the device.
4432 * We don't want the data to overlap the metadata,
4433 * Internal Bitmap issues have been handled elsewhere.
4435 if (rdev
->data_offset
< rdev
->sb_start
) {
4436 if (mddev
->dev_sectors
&&
4437 rdev
->data_offset
+ mddev
->dev_sectors
4439 printk("md: %s: data overlaps metadata\n",
4444 if (rdev
->sb_start
+ rdev
->sb_size
/512
4445 > rdev
->data_offset
) {
4446 printk("md: %s: metadata overlaps data\n",
4451 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4454 spin_lock(&pers_lock
);
4455 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4456 if (!pers
|| !try_module_get(pers
->owner
)) {
4457 spin_unlock(&pers_lock
);
4458 if (mddev
->level
!= LEVEL_NONE
)
4459 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4462 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4467 spin_unlock(&pers_lock
);
4468 if (mddev
->level
!= pers
->level
) {
4469 mddev
->level
= pers
->level
;
4470 mddev
->new_level
= pers
->level
;
4472 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4474 if (mddev
->reshape_position
!= MaxSector
&&
4475 pers
->start_reshape
== NULL
) {
4476 /* This personality cannot handle reshaping... */
4478 module_put(pers
->owner
);
4482 if (pers
->sync_request
) {
4483 /* Warn if this is a potentially silly
4486 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4490 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4491 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4493 rdev
->bdev
->bd_contains
==
4494 rdev2
->bdev
->bd_contains
) {
4496 "%s: WARNING: %s appears to be"
4497 " on the same physical disk as"
4500 bdevname(rdev
->bdev
,b
),
4501 bdevname(rdev2
->bdev
,b2
));
4508 "True protection against single-disk"
4509 " failure might be compromised.\n");
4512 mddev
->recovery
= 0;
4513 /* may be over-ridden by personality */
4514 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4516 mddev
->barriers_work
= 1;
4517 mddev
->ok_start_degraded
= start_dirty_degraded
;
4519 if (start_readonly
&& mddev
->ro
== 0)
4520 mddev
->ro
= 2; /* read-only, but switch on first write */
4522 err
= mddev
->pers
->run(mddev
);
4524 printk(KERN_ERR
"md: pers->run() failed ...\n");
4525 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4526 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4527 " but 'external_size' not in effect?\n", __func__
);
4529 "md: invalid array_size %llu > default size %llu\n",
4530 (unsigned long long)mddev
->array_sectors
/ 2,
4531 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4533 mddev
->pers
->stop(mddev
);
4535 if (err
== 0 && mddev
->pers
->sync_request
) {
4536 err
= bitmap_create(mddev
);
4538 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4539 mdname(mddev
), err
);
4540 mddev
->pers
->stop(mddev
);
4544 module_put(mddev
->pers
->owner
);
4546 bitmap_destroy(mddev
);
4549 if (mddev
->pers
->sync_request
) {
4550 if (mddev
->kobj
.sd
&&
4551 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4553 "md: cannot register extra attributes for %s\n",
4555 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4556 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4559 atomic_set(&mddev
->writes_pending
,0);
4560 atomic_set(&mddev
->max_corr_read_errors
,
4561 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4562 mddev
->safemode
= 0;
4563 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4564 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4565 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4568 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4569 if (rdev
->raid_disk
>= 0) {
4571 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4572 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4573 /* failure here is OK */;
4576 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4579 md_update_sb(mddev
, 0);
4581 md_wakeup_thread(mddev
->thread
);
4582 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4584 md_new_event(mddev
);
4585 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4586 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4587 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4590 EXPORT_SYMBOL_GPL(md_run
);
4592 static int do_md_run(mddev_t
*mddev
)
4596 err
= md_run(mddev
);
4599 err
= bitmap_load(mddev
);
4601 bitmap_destroy(mddev
);
4604 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4605 revalidate_disk(mddev
->gendisk
);
4606 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4611 static int restart_array(mddev_t
*mddev
)
4613 struct gendisk
*disk
= mddev
->gendisk
;
4615 /* Complain if it has no devices */
4616 if (list_empty(&mddev
->disks
))
4622 mddev
->safemode
= 0;
4624 set_disk_ro(disk
, 0);
4625 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4627 /* Kick recovery or resync if necessary */
4628 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4629 md_wakeup_thread(mddev
->thread
);
4630 md_wakeup_thread(mddev
->sync_thread
);
4631 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4635 /* similar to deny_write_access, but accounts for our holding a reference
4636 * to the file ourselves */
4637 static int deny_bitmap_write_access(struct file
* file
)
4639 struct inode
*inode
= file
->f_mapping
->host
;
4641 spin_lock(&inode
->i_lock
);
4642 if (atomic_read(&inode
->i_writecount
) > 1) {
4643 spin_unlock(&inode
->i_lock
);
4646 atomic_set(&inode
->i_writecount
, -1);
4647 spin_unlock(&inode
->i_lock
);
4652 void restore_bitmap_write_access(struct file
*file
)
4654 struct inode
*inode
= file
->f_mapping
->host
;
4656 spin_lock(&inode
->i_lock
);
4657 atomic_set(&inode
->i_writecount
, 1);
4658 spin_unlock(&inode
->i_lock
);
4661 static void md_clean(mddev_t
*mddev
)
4663 mddev
->array_sectors
= 0;
4664 mddev
->external_size
= 0;
4665 mddev
->dev_sectors
= 0;
4666 mddev
->raid_disks
= 0;
4667 mddev
->recovery_cp
= 0;
4668 mddev
->resync_min
= 0;
4669 mddev
->resync_max
= MaxSector
;
4670 mddev
->reshape_position
= MaxSector
;
4671 mddev
->external
= 0;
4672 mddev
->persistent
= 0;
4673 mddev
->level
= LEVEL_NONE
;
4674 mddev
->clevel
[0] = 0;
4677 mddev
->metadata_type
[0] = 0;
4678 mddev
->chunk_sectors
= 0;
4679 mddev
->ctime
= mddev
->utime
= 0;
4681 mddev
->max_disks
= 0;
4683 mddev
->can_decrease_events
= 0;
4684 mddev
->delta_disks
= 0;
4685 mddev
->new_level
= LEVEL_NONE
;
4686 mddev
->new_layout
= 0;
4687 mddev
->new_chunk_sectors
= 0;
4688 mddev
->curr_resync
= 0;
4689 mddev
->resync_mismatches
= 0;
4690 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4691 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4692 mddev
->recovery
= 0;
4694 mddev
->degraded
= 0;
4695 mddev
->barriers_work
= 0;
4696 mddev
->safemode
= 0;
4697 mddev
->bitmap_info
.offset
= 0;
4698 mddev
->bitmap_info
.default_offset
= 0;
4699 mddev
->bitmap_info
.chunksize
= 0;
4700 mddev
->bitmap_info
.daemon_sleep
= 0;
4701 mddev
->bitmap_info
.max_write_behind
= 0;
4705 void md_stop_writes(mddev_t
*mddev
)
4707 if (mddev
->sync_thread
) {
4708 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4709 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4710 md_unregister_thread(mddev
->sync_thread
);
4711 mddev
->sync_thread
= NULL
;
4714 del_timer_sync(&mddev
->safemode_timer
);
4716 bitmap_flush(mddev
);
4717 md_super_wait(mddev
);
4719 if (!mddev
->in_sync
|| mddev
->flags
) {
4720 /* mark array as shutdown cleanly */
4722 md_update_sb(mddev
, 1);
4725 EXPORT_SYMBOL_GPL(md_stop_writes
);
4727 void md_stop(mddev_t
*mddev
)
4729 mddev
->pers
->stop(mddev
);
4730 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4731 mddev
->to_remove
= &md_redundancy_group
;
4732 module_put(mddev
->pers
->owner
);
4734 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4736 EXPORT_SYMBOL_GPL(md_stop
);
4738 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4741 mutex_lock(&mddev
->open_mutex
);
4742 if (atomic_read(&mddev
->openers
) > is_open
) {
4743 printk("md: %s still in use.\n",mdname(mddev
));
4748 md_stop_writes(mddev
);
4754 set_disk_ro(mddev
->gendisk
, 1);
4755 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4756 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4760 mutex_unlock(&mddev
->open_mutex
);
4765 * 0 - completely stop and dis-assemble array
4766 * 2 - stop but do not disassemble array
4768 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4770 struct gendisk
*disk
= mddev
->gendisk
;
4773 mutex_lock(&mddev
->open_mutex
);
4774 if (atomic_read(&mddev
->openers
) > is_open
||
4775 mddev
->sysfs_active
) {
4776 printk("md: %s still in use.\n",mdname(mddev
));
4777 mutex_unlock(&mddev
->open_mutex
);
4783 set_disk_ro(disk
, 0);
4785 md_stop_writes(mddev
);
4787 mddev
->queue
->merge_bvec_fn
= NULL
;
4788 mddev
->queue
->unplug_fn
= NULL
;
4789 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4791 /* tell userspace to handle 'inactive' */
4792 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4794 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4795 if (rdev
->raid_disk
>= 0) {
4797 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4798 sysfs_remove_link(&mddev
->kobj
, nm
);
4801 set_capacity(disk
, 0);
4802 mutex_unlock(&mddev
->open_mutex
);
4803 revalidate_disk(disk
);
4808 mutex_unlock(&mddev
->open_mutex
);
4810 * Free resources if final stop
4813 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4815 bitmap_destroy(mddev
);
4816 if (mddev
->bitmap_info
.file
) {
4817 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4818 fput(mddev
->bitmap_info
.file
);
4819 mddev
->bitmap_info
.file
= NULL
;
4821 mddev
->bitmap_info
.offset
= 0;
4823 export_array(mddev
);
4826 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4827 if (mddev
->hold_active
== UNTIL_STOP
)
4828 mddev
->hold_active
= 0;
4830 blk_integrity_unregister(disk
);
4831 md_new_event(mddev
);
4832 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4837 static void autorun_array(mddev_t
*mddev
)
4842 if (list_empty(&mddev
->disks
))
4845 printk(KERN_INFO
"md: running: ");
4847 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4848 char b
[BDEVNAME_SIZE
];
4849 printk("<%s>", bdevname(rdev
->bdev
,b
));
4853 err
= do_md_run(mddev
);
4855 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4856 do_md_stop(mddev
, 0, 0);
4861 * lets try to run arrays based on all disks that have arrived
4862 * until now. (those are in pending_raid_disks)
4864 * the method: pick the first pending disk, collect all disks with
4865 * the same UUID, remove all from the pending list and put them into
4866 * the 'same_array' list. Then order this list based on superblock
4867 * update time (freshest comes first), kick out 'old' disks and
4868 * compare superblocks. If everything's fine then run it.
4870 * If "unit" is allocated, then bump its reference count
4872 static void autorun_devices(int part
)
4874 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4876 char b
[BDEVNAME_SIZE
];
4878 printk(KERN_INFO
"md: autorun ...\n");
4879 while (!list_empty(&pending_raid_disks
)) {
4882 LIST_HEAD(candidates
);
4883 rdev0
= list_entry(pending_raid_disks
.next
,
4884 mdk_rdev_t
, same_set
);
4886 printk(KERN_INFO
"md: considering %s ...\n",
4887 bdevname(rdev0
->bdev
,b
));
4888 INIT_LIST_HEAD(&candidates
);
4889 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4890 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4891 printk(KERN_INFO
"md: adding %s ...\n",
4892 bdevname(rdev
->bdev
,b
));
4893 list_move(&rdev
->same_set
, &candidates
);
4896 * now we have a set of devices, with all of them having
4897 * mostly sane superblocks. It's time to allocate the
4901 dev
= MKDEV(mdp_major
,
4902 rdev0
->preferred_minor
<< MdpMinorShift
);
4903 unit
= MINOR(dev
) >> MdpMinorShift
;
4905 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4908 if (rdev0
->preferred_minor
!= unit
) {
4909 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4910 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4914 md_probe(dev
, NULL
, NULL
);
4915 mddev
= mddev_find(dev
);
4916 if (!mddev
|| !mddev
->gendisk
) {
4920 "md: cannot allocate memory for md drive.\n");
4923 if (mddev_lock(mddev
))
4924 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4926 else if (mddev
->raid_disks
|| mddev
->major_version
4927 || !list_empty(&mddev
->disks
)) {
4929 "md: %s already running, cannot run %s\n",
4930 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4931 mddev_unlock(mddev
);
4933 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4934 mddev
->persistent
= 1;
4935 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4936 list_del_init(&rdev
->same_set
);
4937 if (bind_rdev_to_array(rdev
, mddev
))
4940 autorun_array(mddev
);
4941 mddev_unlock(mddev
);
4943 /* on success, candidates will be empty, on error
4946 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4947 list_del_init(&rdev
->same_set
);
4952 printk(KERN_INFO
"md: ... autorun DONE.\n");
4954 #endif /* !MODULE */
4956 static int get_version(void __user
* arg
)
4960 ver
.major
= MD_MAJOR_VERSION
;
4961 ver
.minor
= MD_MINOR_VERSION
;
4962 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4964 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4970 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4972 mdu_array_info_t info
;
4973 int nr
,working
,insync
,failed
,spare
;
4976 nr
=working
=insync
=failed
=spare
=0;
4977 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4979 if (test_bit(Faulty
, &rdev
->flags
))
4983 if (test_bit(In_sync
, &rdev
->flags
))
4990 info
.major_version
= mddev
->major_version
;
4991 info
.minor_version
= mddev
->minor_version
;
4992 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4993 info
.ctime
= mddev
->ctime
;
4994 info
.level
= mddev
->level
;
4995 info
.size
= mddev
->dev_sectors
/ 2;
4996 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4999 info
.raid_disks
= mddev
->raid_disks
;
5000 info
.md_minor
= mddev
->md_minor
;
5001 info
.not_persistent
= !mddev
->persistent
;
5003 info
.utime
= mddev
->utime
;
5006 info
.state
= (1<<MD_SB_CLEAN
);
5007 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5008 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5009 info
.active_disks
= insync
;
5010 info
.working_disks
= working
;
5011 info
.failed_disks
= failed
;
5012 info
.spare_disks
= spare
;
5014 info
.layout
= mddev
->layout
;
5015 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5017 if (copy_to_user(arg
, &info
, sizeof(info
)))
5023 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
5025 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5026 char *ptr
, *buf
= NULL
;
5029 if (md_allow_write(mddev
))
5030 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5032 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5037 /* bitmap disabled, zero the first byte and copy out */
5038 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5039 file
->pathname
[0] = '\0';
5043 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5047 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5051 strcpy(file
->pathname
, ptr
);
5055 if (copy_to_user(arg
, file
, sizeof(*file
)))
5063 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5065 mdu_disk_info_t info
;
5068 if (copy_from_user(&info
, arg
, sizeof(info
)))
5071 rdev
= find_rdev_nr(mddev
, info
.number
);
5073 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5074 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5075 info
.raid_disk
= rdev
->raid_disk
;
5077 if (test_bit(Faulty
, &rdev
->flags
))
5078 info
.state
|= (1<<MD_DISK_FAULTY
);
5079 else if (test_bit(In_sync
, &rdev
->flags
)) {
5080 info
.state
|= (1<<MD_DISK_ACTIVE
);
5081 info
.state
|= (1<<MD_DISK_SYNC
);
5083 if (test_bit(WriteMostly
, &rdev
->flags
))
5084 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5086 info
.major
= info
.minor
= 0;
5087 info
.raid_disk
= -1;
5088 info
.state
= (1<<MD_DISK_REMOVED
);
5091 if (copy_to_user(arg
, &info
, sizeof(info
)))
5097 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5099 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5101 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5103 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5106 if (!mddev
->raid_disks
) {
5108 /* expecting a device which has a superblock */
5109 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5112 "md: md_import_device returned %ld\n",
5114 return PTR_ERR(rdev
);
5116 if (!list_empty(&mddev
->disks
)) {
5117 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5118 mdk_rdev_t
, same_set
);
5119 err
= super_types
[mddev
->major_version
]
5120 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5123 "md: %s has different UUID to %s\n",
5124 bdevname(rdev
->bdev
,b
),
5125 bdevname(rdev0
->bdev
,b2
));
5130 err
= bind_rdev_to_array(rdev
, mddev
);
5137 * add_new_disk can be used once the array is assembled
5138 * to add "hot spares". They must already have a superblock
5143 if (!mddev
->pers
->hot_add_disk
) {
5145 "%s: personality does not support diskops!\n",
5149 if (mddev
->persistent
)
5150 rdev
= md_import_device(dev
, mddev
->major_version
,
5151 mddev
->minor_version
);
5153 rdev
= md_import_device(dev
, -1, -1);
5156 "md: md_import_device returned %ld\n",
5158 return PTR_ERR(rdev
);
5160 /* set save_raid_disk if appropriate */
5161 if (!mddev
->persistent
) {
5162 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5163 info
->raid_disk
< mddev
->raid_disks
)
5164 rdev
->raid_disk
= info
->raid_disk
;
5166 rdev
->raid_disk
= -1;
5168 super_types
[mddev
->major_version
].
5169 validate_super(mddev
, rdev
);
5170 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5172 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5173 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5174 set_bit(WriteMostly
, &rdev
->flags
);
5176 clear_bit(WriteMostly
, &rdev
->flags
);
5178 rdev
->raid_disk
= -1;
5179 err
= bind_rdev_to_array(rdev
, mddev
);
5180 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5181 /* If there is hot_add_disk but no hot_remove_disk
5182 * then added disks for geometry changes,
5183 * and should be added immediately.
5185 super_types
[mddev
->major_version
].
5186 validate_super(mddev
, rdev
);
5187 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5189 unbind_rdev_from_array(rdev
);
5194 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5196 md_update_sb(mddev
, 1);
5197 if (mddev
->degraded
)
5198 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5199 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5200 md_wakeup_thread(mddev
->thread
);
5204 /* otherwise, add_new_disk is only allowed
5205 * for major_version==0 superblocks
5207 if (mddev
->major_version
!= 0) {
5208 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5213 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5215 rdev
= md_import_device(dev
, -1, 0);
5218 "md: error, md_import_device() returned %ld\n",
5220 return PTR_ERR(rdev
);
5222 rdev
->desc_nr
= info
->number
;
5223 if (info
->raid_disk
< mddev
->raid_disks
)
5224 rdev
->raid_disk
= info
->raid_disk
;
5226 rdev
->raid_disk
= -1;
5228 if (rdev
->raid_disk
< mddev
->raid_disks
)
5229 if (info
->state
& (1<<MD_DISK_SYNC
))
5230 set_bit(In_sync
, &rdev
->flags
);
5232 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5233 set_bit(WriteMostly
, &rdev
->flags
);
5235 if (!mddev
->persistent
) {
5236 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5237 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5239 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5240 rdev
->sectors
= rdev
->sb_start
;
5242 err
= bind_rdev_to_array(rdev
, mddev
);
5252 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5254 char b
[BDEVNAME_SIZE
];
5257 rdev
= find_rdev(mddev
, dev
);
5261 if (rdev
->raid_disk
>= 0)
5264 kick_rdev_from_array(rdev
);
5265 md_update_sb(mddev
, 1);
5266 md_new_event(mddev
);
5270 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5271 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5275 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5277 char b
[BDEVNAME_SIZE
];
5284 if (mddev
->major_version
!= 0) {
5285 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5286 " version-0 superblocks.\n",
5290 if (!mddev
->pers
->hot_add_disk
) {
5292 "%s: personality does not support diskops!\n",
5297 rdev
= md_import_device(dev
, -1, 0);
5300 "md: error, md_import_device() returned %ld\n",
5305 if (mddev
->persistent
)
5306 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5308 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5310 rdev
->sectors
= rdev
->sb_start
;
5312 if (test_bit(Faulty
, &rdev
->flags
)) {
5314 "md: can not hot-add faulty %s disk to %s!\n",
5315 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5319 clear_bit(In_sync
, &rdev
->flags
);
5321 rdev
->saved_raid_disk
= -1;
5322 err
= bind_rdev_to_array(rdev
, mddev
);
5327 * The rest should better be atomic, we can have disk failures
5328 * noticed in interrupt contexts ...
5331 rdev
->raid_disk
= -1;
5333 md_update_sb(mddev
, 1);
5336 * Kick recovery, maybe this spare has to be added to the
5337 * array immediately.
5339 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5340 md_wakeup_thread(mddev
->thread
);
5341 md_new_event(mddev
);
5349 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5354 if (!mddev
->pers
->quiesce
)
5356 if (mddev
->recovery
|| mddev
->sync_thread
)
5358 /* we should be able to change the bitmap.. */
5364 return -EEXIST
; /* cannot add when bitmap is present */
5365 mddev
->bitmap_info
.file
= fget(fd
);
5367 if (mddev
->bitmap_info
.file
== NULL
) {
5368 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5373 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5375 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5377 fput(mddev
->bitmap_info
.file
);
5378 mddev
->bitmap_info
.file
= NULL
;
5381 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5382 } else if (mddev
->bitmap
== NULL
)
5383 return -ENOENT
; /* cannot remove what isn't there */
5386 mddev
->pers
->quiesce(mddev
, 1);
5388 err
= bitmap_create(mddev
);
5390 err
= bitmap_load(mddev
);
5392 if (fd
< 0 || err
) {
5393 bitmap_destroy(mddev
);
5394 fd
= -1; /* make sure to put the file */
5396 mddev
->pers
->quiesce(mddev
, 0);
5399 if (mddev
->bitmap_info
.file
) {
5400 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5401 fput(mddev
->bitmap_info
.file
);
5403 mddev
->bitmap_info
.file
= NULL
;
5410 * set_array_info is used two different ways
5411 * The original usage is when creating a new array.
5412 * In this usage, raid_disks is > 0 and it together with
5413 * level, size, not_persistent,layout,chunksize determine the
5414 * shape of the array.
5415 * This will always create an array with a type-0.90.0 superblock.
5416 * The newer usage is when assembling an array.
5417 * In this case raid_disks will be 0, and the major_version field is
5418 * use to determine which style super-blocks are to be found on the devices.
5419 * The minor and patch _version numbers are also kept incase the
5420 * super_block handler wishes to interpret them.
5422 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5425 if (info
->raid_disks
== 0) {
5426 /* just setting version number for superblock loading */
5427 if (info
->major_version
< 0 ||
5428 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5429 super_types
[info
->major_version
].name
== NULL
) {
5430 /* maybe try to auto-load a module? */
5432 "md: superblock version %d not known\n",
5433 info
->major_version
);
5436 mddev
->major_version
= info
->major_version
;
5437 mddev
->minor_version
= info
->minor_version
;
5438 mddev
->patch_version
= info
->patch_version
;
5439 mddev
->persistent
= !info
->not_persistent
;
5440 /* ensure mddev_put doesn't delete this now that there
5441 * is some minimal configuration.
5443 mddev
->ctime
= get_seconds();
5446 mddev
->major_version
= MD_MAJOR_VERSION
;
5447 mddev
->minor_version
= MD_MINOR_VERSION
;
5448 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5449 mddev
->ctime
= get_seconds();
5451 mddev
->level
= info
->level
;
5452 mddev
->clevel
[0] = 0;
5453 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5454 mddev
->raid_disks
= info
->raid_disks
;
5455 /* don't set md_minor, it is determined by which /dev/md* was
5458 if (info
->state
& (1<<MD_SB_CLEAN
))
5459 mddev
->recovery_cp
= MaxSector
;
5461 mddev
->recovery_cp
= 0;
5462 mddev
->persistent
= ! info
->not_persistent
;
5463 mddev
->external
= 0;
5465 mddev
->layout
= info
->layout
;
5466 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5468 mddev
->max_disks
= MD_SB_DISKS
;
5470 if (mddev
->persistent
)
5472 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5474 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5475 mddev
->bitmap_info
.offset
= 0;
5477 mddev
->reshape_position
= MaxSector
;
5480 * Generate a 128 bit UUID
5482 get_random_bytes(mddev
->uuid
, 16);
5484 mddev
->new_level
= mddev
->level
;
5485 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5486 mddev
->new_layout
= mddev
->layout
;
5487 mddev
->delta_disks
= 0;
5492 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5494 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5496 if (mddev
->external_size
)
5499 mddev
->array_sectors
= array_sectors
;
5501 EXPORT_SYMBOL(md_set_array_sectors
);
5503 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5507 int fit
= (num_sectors
== 0);
5509 if (mddev
->pers
->resize
== NULL
)
5511 /* The "num_sectors" is the number of sectors of each device that
5512 * is used. This can only make sense for arrays with redundancy.
5513 * linear and raid0 always use whatever space is available. We can only
5514 * consider changing this number if no resync or reconstruction is
5515 * happening, and if the new size is acceptable. It must fit before the
5516 * sb_start or, if that is <data_offset, it must fit before the size
5517 * of each device. If num_sectors is zero, we find the largest size
5521 if (mddev
->sync_thread
)
5524 /* Sorry, cannot grow a bitmap yet, just remove it,
5528 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5529 sector_t avail
= rdev
->sectors
;
5531 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5532 num_sectors
= avail
;
5533 if (avail
< num_sectors
)
5536 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5538 revalidate_disk(mddev
->gendisk
);
5542 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5545 /* change the number of raid disks */
5546 if (mddev
->pers
->check_reshape
== NULL
)
5548 if (raid_disks
<= 0 ||
5549 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5551 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5553 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5555 rv
= mddev
->pers
->check_reshape(mddev
);
5561 * update_array_info is used to change the configuration of an
5563 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5564 * fields in the info are checked against the array.
5565 * Any differences that cannot be handled will cause an error.
5566 * Normally, only one change can be managed at a time.
5568 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5574 /* calculate expected state,ignoring low bits */
5575 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5576 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5578 if (mddev
->major_version
!= info
->major_version
||
5579 mddev
->minor_version
!= info
->minor_version
||
5580 /* mddev->patch_version != info->patch_version || */
5581 mddev
->ctime
!= info
->ctime
||
5582 mddev
->level
!= info
->level
||
5583 /* mddev->layout != info->layout || */
5584 !mddev
->persistent
!= info
->not_persistent
||
5585 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5586 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5587 ((state
^info
->state
) & 0xfffffe00)
5590 /* Check there is only one change */
5591 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5593 if (mddev
->raid_disks
!= info
->raid_disks
)
5595 if (mddev
->layout
!= info
->layout
)
5597 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5604 if (mddev
->layout
!= info
->layout
) {
5606 * we don't need to do anything at the md level, the
5607 * personality will take care of it all.
5609 if (mddev
->pers
->check_reshape
== NULL
)
5612 mddev
->new_layout
= info
->layout
;
5613 rv
= mddev
->pers
->check_reshape(mddev
);
5615 mddev
->new_layout
= mddev
->layout
;
5619 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5620 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5622 if (mddev
->raid_disks
!= info
->raid_disks
)
5623 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5625 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5626 if (mddev
->pers
->quiesce
== NULL
)
5628 if (mddev
->recovery
|| mddev
->sync_thread
)
5630 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5631 /* add the bitmap */
5634 if (mddev
->bitmap_info
.default_offset
== 0)
5636 mddev
->bitmap_info
.offset
=
5637 mddev
->bitmap_info
.default_offset
;
5638 mddev
->pers
->quiesce(mddev
, 1);
5639 rv
= bitmap_create(mddev
);
5641 rv
= bitmap_load(mddev
);
5643 bitmap_destroy(mddev
);
5644 mddev
->pers
->quiesce(mddev
, 0);
5646 /* remove the bitmap */
5649 if (mddev
->bitmap
->file
)
5651 mddev
->pers
->quiesce(mddev
, 1);
5652 bitmap_destroy(mddev
);
5653 mddev
->pers
->quiesce(mddev
, 0);
5654 mddev
->bitmap_info
.offset
= 0;
5657 md_update_sb(mddev
, 1);
5661 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5665 if (mddev
->pers
== NULL
)
5668 rdev
= find_rdev(mddev
, dev
);
5672 md_error(mddev
, rdev
);
5677 * We have a problem here : there is no easy way to give a CHS
5678 * virtual geometry. We currently pretend that we have a 2 heads
5679 * 4 sectors (with a BIG number of cylinders...). This drives
5680 * dosfs just mad... ;-)
5682 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5684 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5688 geo
->cylinders
= mddev
->array_sectors
/ 8;
5692 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5693 unsigned int cmd
, unsigned long arg
)
5696 void __user
*argp
= (void __user
*)arg
;
5697 mddev_t
*mddev
= NULL
;
5700 if (!capable(CAP_SYS_ADMIN
))
5704 * Commands dealing with the RAID driver but not any
5710 err
= get_version(argp
);
5713 case PRINT_RAID_DEBUG
:
5721 autostart_arrays(arg
);
5728 * Commands creating/starting a new array:
5731 mddev
= bdev
->bd_disk
->private_data
;
5738 err
= mddev_lock(mddev
);
5741 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5748 case SET_ARRAY_INFO
:
5750 mdu_array_info_t info
;
5752 memset(&info
, 0, sizeof(info
));
5753 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5758 err
= update_array_info(mddev
, &info
);
5760 printk(KERN_WARNING
"md: couldn't update"
5761 " array info. %d\n", err
);
5766 if (!list_empty(&mddev
->disks
)) {
5768 "md: array %s already has disks!\n",
5773 if (mddev
->raid_disks
) {
5775 "md: array %s already initialised!\n",
5780 err
= set_array_info(mddev
, &info
);
5782 printk(KERN_WARNING
"md: couldn't set"
5783 " array info. %d\n", err
);
5793 * Commands querying/configuring an existing array:
5795 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5796 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5797 if ((!mddev
->raid_disks
&& !mddev
->external
)
5798 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5799 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5800 && cmd
!= GET_BITMAP_FILE
) {
5806 * Commands even a read-only array can execute:
5810 case GET_ARRAY_INFO
:
5811 err
= get_array_info(mddev
, argp
);
5814 case GET_BITMAP_FILE
:
5815 err
= get_bitmap_file(mddev
, argp
);
5819 err
= get_disk_info(mddev
, argp
);
5822 case RESTART_ARRAY_RW
:
5823 err
= restart_array(mddev
);
5827 err
= do_md_stop(mddev
, 0, 1);
5831 err
= md_set_readonly(mddev
, 1);
5835 if (get_user(ro
, (int __user
*)(arg
))) {
5841 /* if the bdev is going readonly the value of mddev->ro
5842 * does not matter, no writes are coming
5847 /* are we are already prepared for writes? */
5851 /* transitioning to readauto need only happen for
5852 * arrays that call md_write_start
5855 err
= restart_array(mddev
);
5858 set_disk_ro(mddev
->gendisk
, 0);
5865 * The remaining ioctls are changing the state of the
5866 * superblock, so we do not allow them on read-only arrays.
5867 * However non-MD ioctls (e.g. get-size) will still come through
5868 * here and hit the 'default' below, so only disallow
5869 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5871 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5872 if (mddev
->ro
== 2) {
5874 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5875 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5876 md_wakeup_thread(mddev
->thread
);
5887 mdu_disk_info_t info
;
5888 if (copy_from_user(&info
, argp
, sizeof(info
)))
5891 err
= add_new_disk(mddev
, &info
);
5895 case HOT_REMOVE_DISK
:
5896 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5900 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5903 case SET_DISK_FAULTY
:
5904 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5908 err
= do_md_run(mddev
);
5911 case SET_BITMAP_FILE
:
5912 err
= set_bitmap_file(mddev
, (int)arg
);
5922 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5924 mddev
->hold_active
= 0;
5925 mddev_unlock(mddev
);
5934 #ifdef CONFIG_COMPAT
5935 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5936 unsigned int cmd
, unsigned long arg
)
5939 case HOT_REMOVE_DISK
:
5941 case SET_DISK_FAULTY
:
5942 case SET_BITMAP_FILE
:
5943 /* These take in integer arg, do not convert */
5946 arg
= (unsigned long)compat_ptr(arg
);
5950 return md_ioctl(bdev
, mode
, cmd
, arg
);
5952 #endif /* CONFIG_COMPAT */
5954 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5957 * Succeed if we can lock the mddev, which confirms that
5958 * it isn't being stopped right now.
5960 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5963 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5964 /* we are racing with mddev_put which is discarding this
5968 /* Wait until bdev->bd_disk is definitely gone */
5969 flush_scheduled_work();
5970 /* Then retry the open from the top */
5971 return -ERESTARTSYS
;
5973 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5975 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5979 atomic_inc(&mddev
->openers
);
5980 mutex_unlock(&mddev
->open_mutex
);
5982 check_disk_size_change(mddev
->gendisk
, bdev
);
5987 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5989 mddev_t
*mddev
= disk
->private_data
;
5992 atomic_dec(&mddev
->openers
);
5997 static const struct block_device_operations md_fops
=
5999 .owner
= THIS_MODULE
,
6001 .release
= md_release
,
6003 #ifdef CONFIG_COMPAT
6004 .compat_ioctl
= md_compat_ioctl
,
6006 .getgeo
= md_getgeo
,
6009 static int md_thread(void * arg
)
6011 mdk_thread_t
*thread
= arg
;
6014 * md_thread is a 'system-thread', it's priority should be very
6015 * high. We avoid resource deadlocks individually in each
6016 * raid personality. (RAID5 does preallocation) We also use RR and
6017 * the very same RT priority as kswapd, thus we will never get
6018 * into a priority inversion deadlock.
6020 * we definitely have to have equal or higher priority than
6021 * bdflush, otherwise bdflush will deadlock if there are too
6022 * many dirty RAID5 blocks.
6025 allow_signal(SIGKILL
);
6026 while (!kthread_should_stop()) {
6028 /* We need to wait INTERRUPTIBLE so that
6029 * we don't add to the load-average.
6030 * That means we need to be sure no signals are
6033 if (signal_pending(current
))
6034 flush_signals(current
);
6036 wait_event_interruptible_timeout
6038 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6039 || kthread_should_stop(),
6042 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6044 thread
->run(thread
->mddev
);
6050 void md_wakeup_thread(mdk_thread_t
*thread
)
6053 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6054 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6055 wake_up(&thread
->wqueue
);
6059 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6062 mdk_thread_t
*thread
;
6064 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6068 init_waitqueue_head(&thread
->wqueue
);
6071 thread
->mddev
= mddev
;
6072 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6073 thread
->tsk
= kthread_run(md_thread
, thread
,
6075 mdname(thread
->mddev
),
6076 name
?: mddev
->pers
->name
);
6077 if (IS_ERR(thread
->tsk
)) {
6084 void md_unregister_thread(mdk_thread_t
*thread
)
6088 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6090 kthread_stop(thread
->tsk
);
6094 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6101 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6104 if (mddev
->external
)
6105 set_bit(Blocked
, &rdev
->flags
);
6107 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6109 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6110 __builtin_return_address(0),__builtin_return_address(1),
6111 __builtin_return_address(2),__builtin_return_address(3));
6115 if (!mddev
->pers
->error_handler
)
6117 mddev
->pers
->error_handler(mddev
,rdev
);
6118 if (mddev
->degraded
)
6119 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6120 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6121 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6122 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6123 md_wakeup_thread(mddev
->thread
);
6124 if (mddev
->event_work
.func
)
6125 schedule_work(&mddev
->event_work
);
6126 md_new_event_inintr(mddev
);
6129 /* seq_file implementation /proc/mdstat */
6131 static void status_unused(struct seq_file
*seq
)
6136 seq_printf(seq
, "unused devices: ");
6138 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6139 char b
[BDEVNAME_SIZE
];
6141 seq_printf(seq
, "%s ",
6142 bdevname(rdev
->bdev
,b
));
6145 seq_printf(seq
, "<none>");
6147 seq_printf(seq
, "\n");
6151 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6153 sector_t max_sectors
, resync
, res
;
6154 unsigned long dt
, db
;
6157 unsigned int per_milli
;
6159 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6161 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6162 max_sectors
= mddev
->resync_max_sectors
;
6164 max_sectors
= mddev
->dev_sectors
;
6167 * Should not happen.
6173 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6174 * in a sector_t, and (max_sectors>>scale) will fit in a
6175 * u32, as those are the requirements for sector_div.
6176 * Thus 'scale' must be at least 10
6179 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6180 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6183 res
= (resync
>>scale
)*1000;
6184 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6188 int i
, x
= per_milli
/50, y
= 20-x
;
6189 seq_printf(seq
, "[");
6190 for (i
= 0; i
< x
; i
++)
6191 seq_printf(seq
, "=");
6192 seq_printf(seq
, ">");
6193 for (i
= 0; i
< y
; i
++)
6194 seq_printf(seq
, ".");
6195 seq_printf(seq
, "] ");
6197 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6198 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6200 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6202 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6203 "resync" : "recovery"))),
6204 per_milli
/10, per_milli
% 10,
6205 (unsigned long long) resync
/2,
6206 (unsigned long long) max_sectors
/2);
6209 * dt: time from mark until now
6210 * db: blocks written from mark until now
6211 * rt: remaining time
6213 * rt is a sector_t, so could be 32bit or 64bit.
6214 * So we divide before multiply in case it is 32bit and close
6216 * We scale the divisor (db) by 32 to avoid loosing precision
6217 * near the end of resync when the number of remaining sectors
6219 * We then divide rt by 32 after multiplying by db to compensate.
6220 * The '+1' avoids division by zero if db is very small.
6222 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6224 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6225 - mddev
->resync_mark_cnt
;
6227 rt
= max_sectors
- resync
; /* number of remaining sectors */
6228 sector_div(rt
, db
/32+1);
6232 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6233 ((unsigned long)rt
% 60)/6);
6235 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6238 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6240 struct list_head
*tmp
;
6250 spin_lock(&all_mddevs_lock
);
6251 list_for_each(tmp
,&all_mddevs
)
6253 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6255 spin_unlock(&all_mddevs_lock
);
6258 spin_unlock(&all_mddevs_lock
);
6260 return (void*)2;/* tail */
6264 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6266 struct list_head
*tmp
;
6267 mddev_t
*next_mddev
, *mddev
= v
;
6273 spin_lock(&all_mddevs_lock
);
6275 tmp
= all_mddevs
.next
;
6277 tmp
= mddev
->all_mddevs
.next
;
6278 if (tmp
!= &all_mddevs
)
6279 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6281 next_mddev
= (void*)2;
6284 spin_unlock(&all_mddevs_lock
);
6292 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6296 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6300 struct mdstat_info
{
6304 static int md_seq_show(struct seq_file
*seq
, void *v
)
6309 struct mdstat_info
*mi
= seq
->private;
6310 struct bitmap
*bitmap
;
6312 if (v
== (void*)1) {
6313 struct mdk_personality
*pers
;
6314 seq_printf(seq
, "Personalities : ");
6315 spin_lock(&pers_lock
);
6316 list_for_each_entry(pers
, &pers_list
, list
)
6317 seq_printf(seq
, "[%s] ", pers
->name
);
6319 spin_unlock(&pers_lock
);
6320 seq_printf(seq
, "\n");
6321 mi
->event
= atomic_read(&md_event_count
);
6324 if (v
== (void*)2) {
6329 if (mddev_lock(mddev
) < 0)
6332 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6333 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6334 mddev
->pers
? "" : "in");
6337 seq_printf(seq
, " (read-only)");
6339 seq_printf(seq
, " (auto-read-only)");
6340 seq_printf(seq
, " %s", mddev
->pers
->name
);
6344 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6345 char b
[BDEVNAME_SIZE
];
6346 seq_printf(seq
, " %s[%d]",
6347 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6348 if (test_bit(WriteMostly
, &rdev
->flags
))
6349 seq_printf(seq
, "(W)");
6350 if (test_bit(Faulty
, &rdev
->flags
)) {
6351 seq_printf(seq
, "(F)");
6353 } else if (rdev
->raid_disk
< 0)
6354 seq_printf(seq
, "(S)"); /* spare */
6355 sectors
+= rdev
->sectors
;
6358 if (!list_empty(&mddev
->disks
)) {
6360 seq_printf(seq
, "\n %llu blocks",
6361 (unsigned long long)
6362 mddev
->array_sectors
/ 2);
6364 seq_printf(seq
, "\n %llu blocks",
6365 (unsigned long long)sectors
/ 2);
6367 if (mddev
->persistent
) {
6368 if (mddev
->major_version
!= 0 ||
6369 mddev
->minor_version
!= 90) {
6370 seq_printf(seq
," super %d.%d",
6371 mddev
->major_version
,
6372 mddev
->minor_version
);
6374 } else if (mddev
->external
)
6375 seq_printf(seq
, " super external:%s",
6376 mddev
->metadata_type
);
6378 seq_printf(seq
, " super non-persistent");
6381 mddev
->pers
->status(seq
, mddev
);
6382 seq_printf(seq
, "\n ");
6383 if (mddev
->pers
->sync_request
) {
6384 if (mddev
->curr_resync
> 2) {
6385 status_resync(seq
, mddev
);
6386 seq_printf(seq
, "\n ");
6387 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6388 seq_printf(seq
, "\tresync=DELAYED\n ");
6389 else if (mddev
->recovery_cp
< MaxSector
)
6390 seq_printf(seq
, "\tresync=PENDING\n ");
6393 seq_printf(seq
, "\n ");
6395 if ((bitmap
= mddev
->bitmap
)) {
6396 unsigned long chunk_kb
;
6397 unsigned long flags
;
6398 spin_lock_irqsave(&bitmap
->lock
, flags
);
6399 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6400 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6402 bitmap
->pages
- bitmap
->missing_pages
,
6404 (bitmap
->pages
- bitmap
->missing_pages
)
6405 << (PAGE_SHIFT
- 10),
6406 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6407 chunk_kb
? "KB" : "B");
6409 seq_printf(seq
, ", file: ");
6410 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6413 seq_printf(seq
, "\n");
6414 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6417 seq_printf(seq
, "\n");
6419 mddev_unlock(mddev
);
6424 static const struct seq_operations md_seq_ops
= {
6425 .start
= md_seq_start
,
6426 .next
= md_seq_next
,
6427 .stop
= md_seq_stop
,
6428 .show
= md_seq_show
,
6431 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6434 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6438 error
= seq_open(file
, &md_seq_ops
);
6442 struct seq_file
*p
= file
->private_data
;
6444 mi
->event
= atomic_read(&md_event_count
);
6449 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6451 struct seq_file
*m
= filp
->private_data
;
6452 struct mdstat_info
*mi
= m
->private;
6455 poll_wait(filp
, &md_event_waiters
, wait
);
6457 /* always allow read */
6458 mask
= POLLIN
| POLLRDNORM
;
6460 if (mi
->event
!= atomic_read(&md_event_count
))
6461 mask
|= POLLERR
| POLLPRI
;
6465 static const struct file_operations md_seq_fops
= {
6466 .owner
= THIS_MODULE
,
6467 .open
= md_seq_open
,
6469 .llseek
= seq_lseek
,
6470 .release
= seq_release_private
,
6471 .poll
= mdstat_poll
,
6474 int register_md_personality(struct mdk_personality
*p
)
6476 spin_lock(&pers_lock
);
6477 list_add_tail(&p
->list
, &pers_list
);
6478 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6479 spin_unlock(&pers_lock
);
6483 int unregister_md_personality(struct mdk_personality
*p
)
6485 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6486 spin_lock(&pers_lock
);
6487 list_del_init(&p
->list
);
6488 spin_unlock(&pers_lock
);
6492 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6500 rdev_for_each_rcu(rdev
, mddev
) {
6501 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6502 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6503 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6504 atomic_read(&disk
->sync_io
);
6505 /* sync IO will cause sync_io to increase before the disk_stats
6506 * as sync_io is counted when a request starts, and
6507 * disk_stats is counted when it completes.
6508 * So resync activity will cause curr_events to be smaller than
6509 * when there was no such activity.
6510 * non-sync IO will cause disk_stat to increase without
6511 * increasing sync_io so curr_events will (eventually)
6512 * be larger than it was before. Once it becomes
6513 * substantially larger, the test below will cause
6514 * the array to appear non-idle, and resync will slow
6516 * If there is a lot of outstanding resync activity when
6517 * we set last_event to curr_events, then all that activity
6518 * completing might cause the array to appear non-idle
6519 * and resync will be slowed down even though there might
6520 * not have been non-resync activity. This will only
6521 * happen once though. 'last_events' will soon reflect
6522 * the state where there is little or no outstanding
6523 * resync requests, and further resync activity will
6524 * always make curr_events less than last_events.
6527 if (init
|| curr_events
- rdev
->last_events
> 64) {
6528 rdev
->last_events
= curr_events
;
6536 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6538 /* another "blocks" (512byte) blocks have been synced */
6539 atomic_sub(blocks
, &mddev
->recovery_active
);
6540 wake_up(&mddev
->recovery_wait
);
6542 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6543 md_wakeup_thread(mddev
->thread
);
6544 // stop recovery, signal do_sync ....
6549 /* md_write_start(mddev, bi)
6550 * If we need to update some array metadata (e.g. 'active' flag
6551 * in superblock) before writing, schedule a superblock update
6552 * and wait for it to complete.
6554 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6557 if (bio_data_dir(bi
) != WRITE
)
6560 BUG_ON(mddev
->ro
== 1);
6561 if (mddev
->ro
== 2) {
6562 /* need to switch to read/write */
6564 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6565 md_wakeup_thread(mddev
->thread
);
6566 md_wakeup_thread(mddev
->sync_thread
);
6569 atomic_inc(&mddev
->writes_pending
);
6570 if (mddev
->safemode
== 1)
6571 mddev
->safemode
= 0;
6572 if (mddev
->in_sync
) {
6573 spin_lock_irq(&mddev
->write_lock
);
6574 if (mddev
->in_sync
) {
6576 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6577 md_wakeup_thread(mddev
->thread
);
6580 spin_unlock_irq(&mddev
->write_lock
);
6583 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6584 wait_event(mddev
->sb_wait
,
6585 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
6586 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6589 void md_write_end(mddev_t
*mddev
)
6591 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6592 if (mddev
->safemode
== 2)
6593 md_wakeup_thread(mddev
->thread
);
6594 else if (mddev
->safemode_delay
)
6595 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6599 /* md_allow_write(mddev)
6600 * Calling this ensures that the array is marked 'active' so that writes
6601 * may proceed without blocking. It is important to call this before
6602 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6603 * Must be called with mddev_lock held.
6605 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6606 * is dropped, so return -EAGAIN after notifying userspace.
6608 int md_allow_write(mddev_t
*mddev
)
6614 if (!mddev
->pers
->sync_request
)
6617 spin_lock_irq(&mddev
->write_lock
);
6618 if (mddev
->in_sync
) {
6620 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6621 if (mddev
->safemode_delay
&&
6622 mddev
->safemode
== 0)
6623 mddev
->safemode
= 1;
6624 spin_unlock_irq(&mddev
->write_lock
);
6625 md_update_sb(mddev
, 0);
6626 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6628 spin_unlock_irq(&mddev
->write_lock
);
6630 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
6635 EXPORT_SYMBOL_GPL(md_allow_write
);
6637 void md_unplug(mddev_t
*mddev
)
6640 blk_unplug(mddev
->queue
);
6642 mddev
->plug
->unplug_fn(mddev
->plug
);
6645 #define SYNC_MARKS 10
6646 #define SYNC_MARK_STEP (3*HZ)
6647 void md_do_sync(mddev_t
*mddev
)
6650 unsigned int currspeed
= 0,
6652 sector_t max_sectors
,j
, io_sectors
;
6653 unsigned long mark
[SYNC_MARKS
];
6654 sector_t mark_cnt
[SYNC_MARKS
];
6656 struct list_head
*tmp
;
6657 sector_t last_check
;
6662 /* just incase thread restarts... */
6663 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6665 if (mddev
->ro
) /* never try to sync a read-only array */
6668 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6669 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6670 desc
= "data-check";
6671 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6672 desc
= "requested-resync";
6675 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6680 /* we overload curr_resync somewhat here.
6681 * 0 == not engaged in resync at all
6682 * 2 == checking that there is no conflict with another sync
6683 * 1 == like 2, but have yielded to allow conflicting resync to
6685 * other == active in resync - this many blocks
6687 * Before starting a resync we must have set curr_resync to
6688 * 2, and then checked that every "conflicting" array has curr_resync
6689 * less than ours. When we find one that is the same or higher
6690 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6691 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6692 * This will mean we have to start checking from the beginning again.
6697 mddev
->curr_resync
= 2;
6700 if (kthread_should_stop())
6701 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6703 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6705 for_each_mddev(mddev2
, tmp
) {
6706 if (mddev2
== mddev
)
6708 if (!mddev
->parallel_resync
6709 && mddev2
->curr_resync
6710 && match_mddev_units(mddev
, mddev2
)) {
6712 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6713 /* arbitrarily yield */
6714 mddev
->curr_resync
= 1;
6715 wake_up(&resync_wait
);
6717 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6718 /* no need to wait here, we can wait the next
6719 * time 'round when curr_resync == 2
6722 /* We need to wait 'interruptible' so as not to
6723 * contribute to the load average, and not to
6724 * be caught by 'softlockup'
6726 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6727 if (!kthread_should_stop() &&
6728 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6729 printk(KERN_INFO
"md: delaying %s of %s"
6730 " until %s has finished (they"
6731 " share one or more physical units)\n",
6732 desc
, mdname(mddev
), mdname(mddev2
));
6734 if (signal_pending(current
))
6735 flush_signals(current
);
6737 finish_wait(&resync_wait
, &wq
);
6740 finish_wait(&resync_wait
, &wq
);
6743 } while (mddev
->curr_resync
< 2);
6746 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6747 /* resync follows the size requested by the personality,
6748 * which defaults to physical size, but can be virtual size
6750 max_sectors
= mddev
->resync_max_sectors
;
6751 mddev
->resync_mismatches
= 0;
6752 /* we don't use the checkpoint if there's a bitmap */
6753 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6754 j
= mddev
->resync_min
;
6755 else if (!mddev
->bitmap
)
6756 j
= mddev
->recovery_cp
;
6758 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6759 max_sectors
= mddev
->dev_sectors
;
6761 /* recovery follows the physical size of devices */
6762 max_sectors
= mddev
->dev_sectors
;
6765 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6766 if (rdev
->raid_disk
>= 0 &&
6767 !test_bit(Faulty
, &rdev
->flags
) &&
6768 !test_bit(In_sync
, &rdev
->flags
) &&
6769 rdev
->recovery_offset
< j
)
6770 j
= rdev
->recovery_offset
;
6774 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6775 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6776 " %d KB/sec/disk.\n", speed_min(mddev
));
6777 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6778 "(but not more than %d KB/sec) for %s.\n",
6779 speed_max(mddev
), desc
);
6781 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6784 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6786 mark_cnt
[m
] = io_sectors
;
6789 mddev
->resync_mark
= mark
[last_mark
];
6790 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6793 * Tune reconstruction:
6795 window
= 32*(PAGE_SIZE
/512);
6796 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6797 window
/2,(unsigned long long) max_sectors
/2);
6799 atomic_set(&mddev
->recovery_active
, 0);
6804 "md: resuming %s of %s from checkpoint.\n",
6805 desc
, mdname(mddev
));
6806 mddev
->curr_resync
= j
;
6808 mddev
->curr_resync_completed
= mddev
->curr_resync
;
6810 while (j
< max_sectors
) {
6815 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6816 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6817 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6818 > (max_sectors
>> 4)) ||
6819 (j
- mddev
->curr_resync_completed
)*2
6820 >= mddev
->resync_max
- mddev
->curr_resync_completed
6822 /* time to update curr_resync_completed */
6824 wait_event(mddev
->recovery_wait
,
6825 atomic_read(&mddev
->recovery_active
) == 0);
6826 mddev
->curr_resync_completed
=
6828 if (mddev
->persistent
)
6829 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6830 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6833 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6834 /* As this condition is controlled by user-space,
6835 * we can block indefinitely, so use '_interruptible'
6836 * to avoid triggering warnings.
6838 flush_signals(current
); /* just in case */
6839 wait_event_interruptible(mddev
->recovery_wait
,
6840 mddev
->resync_max
> j
6841 || kthread_should_stop());
6844 if (kthread_should_stop())
6847 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6848 currspeed
< speed_min(mddev
));
6850 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6854 if (!skipped
) { /* actual IO requested */
6855 io_sectors
+= sectors
;
6856 atomic_add(sectors
, &mddev
->recovery_active
);
6860 if (j
>1) mddev
->curr_resync
= j
;
6861 mddev
->curr_mark_cnt
= io_sectors
;
6862 if (last_check
== 0)
6863 /* this is the earliers that rebuilt will be
6864 * visible in /proc/mdstat
6866 md_new_event(mddev
);
6868 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6871 last_check
= io_sectors
;
6873 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6877 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6879 int next
= (last_mark
+1) % SYNC_MARKS
;
6881 mddev
->resync_mark
= mark
[next
];
6882 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6883 mark
[next
] = jiffies
;
6884 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6889 if (kthread_should_stop())
6894 * this loop exits only if either when we are slower than
6895 * the 'hard' speed limit, or the system was IO-idle for
6897 * the system might be non-idle CPU-wise, but we only care
6898 * about not overloading the IO subsystem. (things like an
6899 * e2fsck being done on the RAID array should execute fast)
6904 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6905 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6907 if (currspeed
> speed_min(mddev
)) {
6908 if ((currspeed
> speed_max(mddev
)) ||
6909 !is_mddev_idle(mddev
, 0)) {
6915 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6917 * this also signals 'finished resyncing' to md_stop
6922 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6924 /* tell personality that we are finished */
6925 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6927 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6928 mddev
->curr_resync
> 2) {
6929 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6930 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6931 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6933 "md: checkpointing %s of %s.\n",
6934 desc
, mdname(mddev
));
6935 mddev
->recovery_cp
= mddev
->curr_resync
;
6938 mddev
->recovery_cp
= MaxSector
;
6940 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6941 mddev
->curr_resync
= MaxSector
;
6943 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6944 if (rdev
->raid_disk
>= 0 &&
6945 mddev
->delta_disks
>= 0 &&
6946 !test_bit(Faulty
, &rdev
->flags
) &&
6947 !test_bit(In_sync
, &rdev
->flags
) &&
6948 rdev
->recovery_offset
< mddev
->curr_resync
)
6949 rdev
->recovery_offset
= mddev
->curr_resync
;
6953 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6956 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6957 /* We completed so min/max setting can be forgotten if used. */
6958 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6959 mddev
->resync_min
= 0;
6960 mddev
->resync_max
= MaxSector
;
6961 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6962 mddev
->resync_min
= mddev
->curr_resync_completed
;
6963 mddev
->curr_resync
= 0;
6964 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6965 mddev
->curr_resync_completed
= 0;
6966 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6967 wake_up(&resync_wait
);
6968 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6969 md_wakeup_thread(mddev
->thread
);
6974 * got a signal, exit.
6977 "md: md_do_sync() got signal ... exiting\n");
6978 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6982 EXPORT_SYMBOL_GPL(md_do_sync
);
6985 static int remove_and_add_spares(mddev_t
*mddev
)
6990 mddev
->curr_resync_completed
= 0;
6992 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6993 if (rdev
->raid_disk
>= 0 &&
6994 !test_bit(Blocked
, &rdev
->flags
) &&
6995 (test_bit(Faulty
, &rdev
->flags
) ||
6996 ! test_bit(In_sync
, &rdev
->flags
)) &&
6997 atomic_read(&rdev
->nr_pending
)==0) {
6998 if (mddev
->pers
->hot_remove_disk(
6999 mddev
, rdev
->raid_disk
)==0) {
7001 sprintf(nm
,"rd%d", rdev
->raid_disk
);
7002 sysfs_remove_link(&mddev
->kobj
, nm
);
7003 rdev
->raid_disk
= -1;
7007 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
7008 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7009 if (rdev
->raid_disk
>= 0 &&
7010 !test_bit(In_sync
, &rdev
->flags
) &&
7011 !test_bit(Blocked
, &rdev
->flags
))
7013 if (rdev
->raid_disk
< 0
7014 && !test_bit(Faulty
, &rdev
->flags
)) {
7015 rdev
->recovery_offset
= 0;
7017 hot_add_disk(mddev
, rdev
) == 0) {
7019 sprintf(nm
, "rd%d", rdev
->raid_disk
);
7020 if (sysfs_create_link(&mddev
->kobj
,
7022 /* failure here is OK */;
7024 md_new_event(mddev
);
7025 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7034 * This routine is regularly called by all per-raid-array threads to
7035 * deal with generic issues like resync and super-block update.
7036 * Raid personalities that don't have a thread (linear/raid0) do not
7037 * need this as they never do any recovery or update the superblock.
7039 * It does not do any resync itself, but rather "forks" off other threads
7040 * to do that as needed.
7041 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7042 * "->recovery" and create a thread at ->sync_thread.
7043 * When the thread finishes it sets MD_RECOVERY_DONE
7044 * and wakeups up this thread which will reap the thread and finish up.
7045 * This thread also removes any faulty devices (with nr_pending == 0).
7047 * The overall approach is:
7048 * 1/ if the superblock needs updating, update it.
7049 * 2/ If a recovery thread is running, don't do anything else.
7050 * 3/ If recovery has finished, clean up, possibly marking spares active.
7051 * 4/ If there are any faulty devices, remove them.
7052 * 5/ If array is degraded, try to add spares devices
7053 * 6/ If array has spares or is not in-sync, start a resync thread.
7055 void md_check_recovery(mddev_t
*mddev
)
7061 bitmap_daemon_work(mddev
);
7066 if (signal_pending(current
)) {
7067 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7068 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7070 mddev
->safemode
= 2;
7072 flush_signals(current
);
7075 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7078 (mddev
->flags
&& !mddev
->external
) ||
7079 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7080 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7081 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7082 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7083 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7087 if (mddev_trylock(mddev
)) {
7091 /* Only thing we do on a ro array is remove
7094 remove_and_add_spares(mddev
);
7095 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7099 if (!mddev
->external
) {
7101 spin_lock_irq(&mddev
->write_lock
);
7102 if (mddev
->safemode
&&
7103 !atomic_read(&mddev
->writes_pending
) &&
7105 mddev
->recovery_cp
== MaxSector
) {
7108 if (mddev
->persistent
)
7109 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7111 if (mddev
->safemode
== 1)
7112 mddev
->safemode
= 0;
7113 spin_unlock_irq(&mddev
->write_lock
);
7115 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7119 md_update_sb(mddev
, 0);
7121 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7122 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7123 /* resync/recovery still happening */
7124 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7127 if (mddev
->sync_thread
) {
7128 /* resync has finished, collect result */
7129 md_unregister_thread(mddev
->sync_thread
);
7130 mddev
->sync_thread
= NULL
;
7131 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7132 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7134 /* activate any spares */
7135 if (mddev
->pers
->spare_active(mddev
))
7136 sysfs_notify(&mddev
->kobj
, NULL
,
7139 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7140 mddev
->pers
->finish_reshape
)
7141 mddev
->pers
->finish_reshape(mddev
);
7142 md_update_sb(mddev
, 1);
7144 /* if array is no-longer degraded, then any saved_raid_disk
7145 * information must be scrapped
7147 if (!mddev
->degraded
)
7148 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7149 rdev
->saved_raid_disk
= -1;
7151 mddev
->recovery
= 0;
7152 /* flag recovery needed just to double check */
7153 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7154 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7155 md_new_event(mddev
);
7158 /* Set RUNNING before clearing NEEDED to avoid
7159 * any transients in the value of "sync_action".
7161 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7162 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7163 /* Clear some bits that don't mean anything, but
7166 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7167 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7169 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7171 /* no recovery is running.
7172 * remove any failed drives, then
7173 * add spares if possible.
7174 * Spare are also removed and re-added, to allow
7175 * the personality to fail the re-add.
7178 if (mddev
->reshape_position
!= MaxSector
) {
7179 if (mddev
->pers
->check_reshape
== NULL
||
7180 mddev
->pers
->check_reshape(mddev
) != 0)
7181 /* Cannot proceed */
7183 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7184 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7185 } else if ((spares
= remove_and_add_spares(mddev
))) {
7186 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7187 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7188 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7189 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7190 } else if (mddev
->recovery_cp
< MaxSector
) {
7191 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7192 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7193 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7194 /* nothing to be done ... */
7197 if (mddev
->pers
->sync_request
) {
7198 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7199 /* We are adding a device or devices to an array
7200 * which has the bitmap stored on all devices.
7201 * So make sure all bitmap pages get written
7203 bitmap_write_all(mddev
->bitmap
);
7205 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7208 if (!mddev
->sync_thread
) {
7209 printk(KERN_ERR
"%s: could not start resync"
7212 /* leave the spares where they are, it shouldn't hurt */
7213 mddev
->recovery
= 0;
7215 md_wakeup_thread(mddev
->sync_thread
);
7216 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7217 md_new_event(mddev
);
7220 if (!mddev
->sync_thread
) {
7221 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7222 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7224 if (mddev
->sysfs_action
)
7225 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7227 mddev_unlock(mddev
);
7231 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7233 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7234 wait_event_timeout(rdev
->blocked_wait
,
7235 !test_bit(Blocked
, &rdev
->flags
),
7236 msecs_to_jiffies(5000));
7237 rdev_dec_pending(rdev
, mddev
);
7239 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7241 static int md_notify_reboot(struct notifier_block
*this,
7242 unsigned long code
, void *x
)
7244 struct list_head
*tmp
;
7247 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7249 printk(KERN_INFO
"md: stopping all md devices.\n");
7251 for_each_mddev(mddev
, tmp
)
7252 if (mddev_trylock(mddev
)) {
7253 /* Force a switch to readonly even array
7254 * appears to still be in use. Hence
7257 md_set_readonly(mddev
, 100);
7258 mddev_unlock(mddev
);
7261 * certain more exotic SCSI devices are known to be
7262 * volatile wrt too early system reboots. While the
7263 * right place to handle this issue is the given
7264 * driver, we do want to have a safe RAID driver ...
7271 static struct notifier_block md_notifier
= {
7272 .notifier_call
= md_notify_reboot
,
7274 .priority
= INT_MAX
, /* before any real devices */
7277 static void md_geninit(void)
7279 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7281 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7284 static int __init
md_init(void)
7286 if (register_blkdev(MD_MAJOR
, "md"))
7288 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
7289 unregister_blkdev(MD_MAJOR
, "md");
7292 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7293 md_probe
, NULL
, NULL
);
7294 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7295 md_probe
, NULL
, NULL
);
7297 register_reboot_notifier(&md_notifier
);
7298 raid_table_header
= register_sysctl_table(raid_root_table
);
7308 * Searches all registered partitions for autorun RAID arrays
7312 static LIST_HEAD(all_detected_devices
);
7313 struct detected_devices_node
{
7314 struct list_head list
;
7318 void md_autodetect_dev(dev_t dev
)
7320 struct detected_devices_node
*node_detected_dev
;
7322 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7323 if (node_detected_dev
) {
7324 node_detected_dev
->dev
= dev
;
7325 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7327 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7328 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7333 static void autostart_arrays(int part
)
7336 struct detected_devices_node
*node_detected_dev
;
7338 int i_scanned
, i_passed
;
7343 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7345 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7347 node_detected_dev
= list_entry(all_detected_devices
.next
,
7348 struct detected_devices_node
, list
);
7349 list_del(&node_detected_dev
->list
);
7350 dev
= node_detected_dev
->dev
;
7351 kfree(node_detected_dev
);
7352 rdev
= md_import_device(dev
,0, 90);
7356 if (test_bit(Faulty
, &rdev
->flags
)) {
7360 set_bit(AutoDetected
, &rdev
->flags
);
7361 list_add(&rdev
->same_set
, &pending_raid_disks
);
7365 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7366 i_scanned
, i_passed
);
7368 autorun_devices(part
);
7371 #endif /* !MODULE */
7373 static __exit
void md_exit(void)
7376 struct list_head
*tmp
;
7378 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7379 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7381 unregister_blkdev(MD_MAJOR
,"md");
7382 unregister_blkdev(mdp_major
, "mdp");
7383 unregister_reboot_notifier(&md_notifier
);
7384 unregister_sysctl_table(raid_table_header
);
7385 remove_proc_entry("mdstat", NULL
);
7386 for_each_mddev(mddev
, tmp
) {
7387 export_array(mddev
);
7388 mddev
->hold_active
= 0;
7392 subsys_initcall(md_init
);
7393 module_exit(md_exit
)
7395 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7397 return sprintf(buffer
, "%d", start_readonly
);
7399 static int set_ro(const char *val
, struct kernel_param
*kp
)
7402 int num
= simple_strtoul(val
, &e
, 10);
7403 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7404 start_readonly
= num
;
7410 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7411 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7413 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7415 EXPORT_SYMBOL(register_md_personality
);
7416 EXPORT_SYMBOL(unregister_md_personality
);
7417 EXPORT_SYMBOL(md_error
);
7418 EXPORT_SYMBOL(md_done_sync
);
7419 EXPORT_SYMBOL(md_write_start
);
7420 EXPORT_SYMBOL(md_write_end
);
7421 EXPORT_SYMBOL(md_register_thread
);
7422 EXPORT_SYMBOL(md_unregister_thread
);
7423 EXPORT_SYMBOL(md_wakeup_thread
);
7424 EXPORT_SYMBOL(md_check_recovery
);
7425 MODULE_LICENSE("GPL");
7426 MODULE_DESCRIPTION("MD RAID framework");
7428 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);