2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 #define dprintk(x...) ((void)(DEBUG && printk(x)))
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
);
70 static struct workqueue_struct
*md_wq
;
71 static struct workqueue_struct
*md_misc_wq
;
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min
= 1000;
95 static int sysctl_speed_limit_max
= 200000;
96 static inline int speed_min(mddev_t
*mddev
)
98 return mddev
->sync_speed_min
?
99 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
102 static inline int speed_max(mddev_t
*mddev
)
104 return mddev
->sync_speed_max
?
105 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
108 static struct ctl_table_header
*raid_table_header
;
110 static ctl_table raid_table
[] = {
112 .procname
= "speed_limit_min",
113 .data
= &sysctl_speed_limit_min
,
114 .maxlen
= sizeof(int),
115 .mode
= S_IRUGO
|S_IWUSR
,
116 .proc_handler
= proc_dointvec
,
119 .procname
= "speed_limit_max",
120 .data
= &sysctl_speed_limit_max
,
121 .maxlen
= sizeof(int),
122 .mode
= S_IRUGO
|S_IWUSR
,
123 .proc_handler
= proc_dointvec
,
128 static ctl_table raid_dir_table
[] = {
132 .mode
= S_IRUGO
|S_IXUGO
,
138 static ctl_table raid_root_table
[] = {
143 .child
= raid_dir_table
,
148 static const struct block_device_operations md_fops
;
150 static int start_readonly
;
153 * like bio_clone, but with a local bio set
156 static void mddev_bio_destructor(struct bio
*bio
)
158 mddev_t
*mddev
, **mddevp
;
163 bio_free(bio
, mddev
->bio_set
);
166 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
172 if (!mddev
|| !mddev
->bio_set
)
173 return bio_alloc(gfp_mask
, nr_iovecs
);
175 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
,
181 b
->bi_destructor
= mddev_bio_destructor
;
184 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
186 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
192 if (!mddev
|| !mddev
->bio_set
)
193 return bio_clone(bio
, gfp_mask
);
195 b
= bio_alloc_bioset(gfp_mask
, bio
->bi_max_vecs
,
201 b
->bi_destructor
= mddev_bio_destructor
;
203 if (bio_integrity(bio
)) {
206 ret
= bio_integrity_clone(b
, bio
, gfp_mask
, mddev
->bio_set
);
216 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
219 * We have a system wide 'event count' that is incremented
220 * on any 'interesting' event, and readers of /proc/mdstat
221 * can use 'poll' or 'select' to find out when the event
225 * start array, stop array, error, add device, remove device,
226 * start build, activate spare
228 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
229 static atomic_t md_event_count
;
230 void md_new_event(mddev_t
*mddev
)
232 atomic_inc(&md_event_count
);
233 wake_up(&md_event_waiters
);
235 EXPORT_SYMBOL_GPL(md_new_event
);
237 /* Alternate version that can be called from interrupts
238 * when calling sysfs_notify isn't needed.
240 static void md_new_event_inintr(mddev_t
*mddev
)
242 atomic_inc(&md_event_count
);
243 wake_up(&md_event_waiters
);
247 * Enables to iterate over all existing md arrays
248 * all_mddevs_lock protects this list.
250 static LIST_HEAD(all_mddevs
);
251 static DEFINE_SPINLOCK(all_mddevs_lock
);
255 * iterates through all used mddevs in the system.
256 * We take care to grab the all_mddevs_lock whenever navigating
257 * the list, and to always hold a refcount when unlocked.
258 * Any code which breaks out of this loop while own
259 * a reference to the current mddev and must mddev_put it.
261 #define for_each_mddev(mddev,tmp) \
263 for (({ spin_lock(&all_mddevs_lock); \
264 tmp = all_mddevs.next; \
266 ({ if (tmp != &all_mddevs) \
267 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
268 spin_unlock(&all_mddevs_lock); \
269 if (mddev) mddev_put(mddev); \
270 mddev = list_entry(tmp, mddev_t, all_mddevs); \
271 tmp != &all_mddevs;}); \
272 ({ spin_lock(&all_mddevs_lock); \
277 /* Rather than calling directly into the personality make_request function,
278 * IO requests come here first so that we can check if the device is
279 * being suspended pending a reconfiguration.
280 * We hold a refcount over the call to ->make_request. By the time that
281 * call has finished, the bio has been linked into some internal structure
282 * and so is visible to ->quiesce(), so we don't need the refcount any more.
284 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
286 const int rw
= bio_data_dir(bio
);
287 mddev_t
*mddev
= q
->queuedata
;
290 unsigned int sectors
;
292 if (mddev
== NULL
|| mddev
->pers
== NULL
297 smp_rmb(); /* Ensure implications of 'active' are visible */
299 if (mddev
->suspended
) {
302 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
303 TASK_UNINTERRUPTIBLE
);
304 if (!mddev
->suspended
)
310 finish_wait(&mddev
->sb_wait
, &__wait
);
312 atomic_inc(&mddev
->active_io
);
316 * save the sectors now since our bio can
317 * go away inside make_request
319 sectors
= bio_sectors(bio
);
320 rv
= mddev
->pers
->make_request(mddev
, bio
);
322 cpu
= part_stat_lock();
323 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
324 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
327 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
328 wake_up(&mddev
->sb_wait
);
333 /* mddev_suspend makes sure no new requests are submitted
334 * to the device, and that any requests that have been submitted
335 * are completely handled.
336 * Once ->stop is called and completes, the module will be completely
339 void mddev_suspend(mddev_t
*mddev
)
341 BUG_ON(mddev
->suspended
);
342 mddev
->suspended
= 1;
344 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
345 mddev
->pers
->quiesce(mddev
, 1);
347 EXPORT_SYMBOL_GPL(mddev_suspend
);
349 void mddev_resume(mddev_t
*mddev
)
351 mddev
->suspended
= 0;
352 wake_up(&mddev
->sb_wait
);
353 mddev
->pers
->quiesce(mddev
, 0);
355 EXPORT_SYMBOL_GPL(mddev_resume
);
357 int mddev_congested(mddev_t
*mddev
, int bits
)
359 return mddev
->suspended
;
361 EXPORT_SYMBOL(mddev_congested
);
364 * Generic flush handling for md
367 static void md_end_flush(struct bio
*bio
, int err
)
369 mdk_rdev_t
*rdev
= bio
->bi_private
;
370 mddev_t
*mddev
= rdev
->mddev
;
372 rdev_dec_pending(rdev
, mddev
);
374 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
375 /* The pre-request flush has finished */
376 queue_work(md_wq
, &mddev
->flush_work
);
381 static void md_submit_flush_data(struct work_struct
*ws
);
383 static void submit_flushes(struct work_struct
*ws
)
385 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
388 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
389 atomic_set(&mddev
->flush_pending
, 1);
391 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
392 if (rdev
->raid_disk
>= 0 &&
393 !test_bit(Faulty
, &rdev
->flags
)) {
394 /* Take two references, one is dropped
395 * when request finishes, one after
396 * we reclaim rcu_read_lock
399 atomic_inc(&rdev
->nr_pending
);
400 atomic_inc(&rdev
->nr_pending
);
402 bi
= bio_alloc_mddev(GFP_KERNEL
, 0, mddev
);
403 bi
->bi_end_io
= md_end_flush
;
404 bi
->bi_private
= rdev
;
405 bi
->bi_bdev
= rdev
->bdev
;
406 atomic_inc(&mddev
->flush_pending
);
407 submit_bio(WRITE_FLUSH
, bi
);
409 rdev_dec_pending(rdev
, mddev
);
412 if (atomic_dec_and_test(&mddev
->flush_pending
))
413 queue_work(md_wq
, &mddev
->flush_work
);
416 static void md_submit_flush_data(struct work_struct
*ws
)
418 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
419 struct bio
*bio
= mddev
->flush_bio
;
421 if (bio
->bi_size
== 0)
422 /* an empty barrier - all done */
425 bio
->bi_rw
&= ~REQ_FLUSH
;
426 if (mddev
->pers
->make_request(mddev
, bio
))
427 generic_make_request(bio
);
430 mddev
->flush_bio
= NULL
;
431 wake_up(&mddev
->sb_wait
);
434 void md_flush_request(mddev_t
*mddev
, struct bio
*bio
)
436 spin_lock_irq(&mddev
->write_lock
);
437 wait_event_lock_irq(mddev
->sb_wait
,
439 mddev
->write_lock
, /*nothing*/);
440 mddev
->flush_bio
= bio
;
441 spin_unlock_irq(&mddev
->write_lock
);
443 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
444 queue_work(md_wq
, &mddev
->flush_work
);
446 EXPORT_SYMBOL(md_flush_request
);
448 /* Support for plugging.
449 * This mirrors the plugging support in request_queue, but does not
450 * require having a whole queue
452 static void plugger_work(struct work_struct
*work
)
454 struct plug_handle
*plug
=
455 container_of(work
, struct plug_handle
, unplug_work
);
456 plug
->unplug_fn(plug
);
458 static void plugger_timeout(unsigned long data
)
460 struct plug_handle
*plug
= (void *)data
;
461 kblockd_schedule_work(NULL
, &plug
->unplug_work
);
463 void plugger_init(struct plug_handle
*plug
,
464 void (*unplug_fn
)(struct plug_handle
*))
466 plug
->unplug_flag
= 0;
467 plug
->unplug_fn
= unplug_fn
;
468 init_timer(&plug
->unplug_timer
);
469 plug
->unplug_timer
.function
= plugger_timeout
;
470 plug
->unplug_timer
.data
= (unsigned long)plug
;
471 INIT_WORK(&plug
->unplug_work
, plugger_work
);
473 EXPORT_SYMBOL_GPL(plugger_init
);
475 void plugger_set_plug(struct plug_handle
*plug
)
477 if (!test_and_set_bit(PLUGGED_FLAG
, &plug
->unplug_flag
))
478 mod_timer(&plug
->unplug_timer
, jiffies
+ msecs_to_jiffies(3)+1);
480 EXPORT_SYMBOL_GPL(plugger_set_plug
);
482 int plugger_remove_plug(struct plug_handle
*plug
)
484 if (test_and_clear_bit(PLUGGED_FLAG
, &plug
->unplug_flag
)) {
485 del_timer(&plug
->unplug_timer
);
490 EXPORT_SYMBOL_GPL(plugger_remove_plug
);
493 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
495 atomic_inc(&mddev
->active
);
499 static void mddev_delayed_delete(struct work_struct
*ws
);
501 static void mddev_put(mddev_t
*mddev
)
503 struct bio_set
*bs
= NULL
;
505 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
507 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
508 mddev
->ctime
== 0 && !mddev
->hold_active
) {
509 /* Array is not configured at all, and not held active,
511 list_del(&mddev
->all_mddevs
);
513 mddev
->bio_set
= NULL
;
514 if (mddev
->gendisk
) {
515 /* We did a probe so need to clean up. Call
516 * queue_work inside the spinlock so that
517 * flush_workqueue() after mddev_find will
518 * succeed in waiting for the work to be done.
520 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
521 queue_work(md_misc_wq
, &mddev
->del_work
);
525 spin_unlock(&all_mddevs_lock
);
530 void mddev_init(mddev_t
*mddev
)
532 mutex_init(&mddev
->open_mutex
);
533 mutex_init(&mddev
->reconfig_mutex
);
534 mutex_init(&mddev
->bitmap_info
.mutex
);
535 INIT_LIST_HEAD(&mddev
->disks
);
536 INIT_LIST_HEAD(&mddev
->all_mddevs
);
537 init_timer(&mddev
->safemode_timer
);
538 atomic_set(&mddev
->active
, 1);
539 atomic_set(&mddev
->openers
, 0);
540 atomic_set(&mddev
->active_io
, 0);
541 spin_lock_init(&mddev
->write_lock
);
542 atomic_set(&mddev
->flush_pending
, 0);
543 init_waitqueue_head(&mddev
->sb_wait
);
544 init_waitqueue_head(&mddev
->recovery_wait
);
545 mddev
->reshape_position
= MaxSector
;
546 mddev
->resync_min
= 0;
547 mddev
->resync_max
= MaxSector
;
548 mddev
->level
= LEVEL_NONE
;
550 EXPORT_SYMBOL_GPL(mddev_init
);
552 static mddev_t
* mddev_find(dev_t unit
)
554 mddev_t
*mddev
, *new = NULL
;
556 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
557 unit
&= ~((1<<MdpMinorShift
)-1);
560 spin_lock(&all_mddevs_lock
);
563 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
564 if (mddev
->unit
== unit
) {
566 spin_unlock(&all_mddevs_lock
);
572 list_add(&new->all_mddevs
, &all_mddevs
);
573 spin_unlock(&all_mddevs_lock
);
574 new->hold_active
= UNTIL_IOCTL
;
578 /* find an unused unit number */
579 static int next_minor
= 512;
580 int start
= next_minor
;
584 dev
= MKDEV(MD_MAJOR
, next_minor
);
586 if (next_minor
> MINORMASK
)
588 if (next_minor
== start
) {
589 /* Oh dear, all in use. */
590 spin_unlock(&all_mddevs_lock
);
596 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
597 if (mddev
->unit
== dev
) {
603 new->md_minor
= MINOR(dev
);
604 new->hold_active
= UNTIL_STOP
;
605 list_add(&new->all_mddevs
, &all_mddevs
);
606 spin_unlock(&all_mddevs_lock
);
609 spin_unlock(&all_mddevs_lock
);
611 new = kzalloc(sizeof(*new), GFP_KERNEL
);
616 if (MAJOR(unit
) == MD_MAJOR
)
617 new->md_minor
= MINOR(unit
);
619 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
626 static inline int mddev_lock(mddev_t
* mddev
)
628 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
631 static inline int mddev_is_locked(mddev_t
*mddev
)
633 return mutex_is_locked(&mddev
->reconfig_mutex
);
636 static inline int mddev_trylock(mddev_t
* mddev
)
638 return mutex_trylock(&mddev
->reconfig_mutex
);
641 static struct attribute_group md_redundancy_group
;
643 static void mddev_unlock(mddev_t
* mddev
)
645 if (mddev
->to_remove
) {
646 /* These cannot be removed under reconfig_mutex as
647 * an access to the files will try to take reconfig_mutex
648 * while holding the file unremovable, which leads to
650 * So hold set sysfs_active while the remove in happeing,
651 * and anything else which might set ->to_remove or my
652 * otherwise change the sysfs namespace will fail with
653 * -EBUSY if sysfs_active is still set.
654 * We set sysfs_active under reconfig_mutex and elsewhere
655 * test it under the same mutex to ensure its correct value
658 struct attribute_group
*to_remove
= mddev
->to_remove
;
659 mddev
->to_remove
= NULL
;
660 mddev
->sysfs_active
= 1;
661 mutex_unlock(&mddev
->reconfig_mutex
);
663 if (mddev
->kobj
.sd
) {
664 if (to_remove
!= &md_redundancy_group
)
665 sysfs_remove_group(&mddev
->kobj
, to_remove
);
666 if (mddev
->pers
== NULL
||
667 mddev
->pers
->sync_request
== NULL
) {
668 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
669 if (mddev
->sysfs_action
)
670 sysfs_put(mddev
->sysfs_action
);
671 mddev
->sysfs_action
= NULL
;
674 mddev
->sysfs_active
= 0;
676 mutex_unlock(&mddev
->reconfig_mutex
);
678 md_wakeup_thread(mddev
->thread
);
681 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
685 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
686 if (rdev
->desc_nr
== nr
)
692 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
696 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
697 if (rdev
->bdev
->bd_dev
== dev
)
703 static struct mdk_personality
*find_pers(int level
, char *clevel
)
705 struct mdk_personality
*pers
;
706 list_for_each_entry(pers
, &pers_list
, list
) {
707 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
709 if (strcmp(pers
->name
, clevel
)==0)
715 /* return the offset of the super block in 512byte sectors */
716 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
718 sector_t num_sectors
= i_size_read(bdev
->bd_inode
) / 512;
719 return MD_NEW_SIZE_SECTORS(num_sectors
);
722 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
727 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
728 if (!rdev
->sb_page
) {
729 printk(KERN_ALERT
"md: out of memory.\n");
736 static void free_disk_sb(mdk_rdev_t
* rdev
)
739 put_page(rdev
->sb_page
);
741 rdev
->sb_page
= NULL
;
748 static void super_written(struct bio
*bio
, int error
)
750 mdk_rdev_t
*rdev
= bio
->bi_private
;
751 mddev_t
*mddev
= rdev
->mddev
;
753 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
754 printk("md: super_written gets error=%d, uptodate=%d\n",
755 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
756 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
757 md_error(mddev
, rdev
);
760 if (atomic_dec_and_test(&mddev
->pending_writes
))
761 wake_up(&mddev
->sb_wait
);
765 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
766 sector_t sector
, int size
, struct page
*page
)
768 /* write first size bytes of page to sector of rdev
769 * Increment mddev->pending_writes before returning
770 * and decrement it on completion, waking up sb_wait
771 * if zero is reached.
772 * If an error occurred, call md_error
774 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
776 bio
->bi_bdev
= rdev
->bdev
;
777 bio
->bi_sector
= sector
;
778 bio_add_page(bio
, page
, size
, 0);
779 bio
->bi_private
= rdev
;
780 bio
->bi_end_io
= super_written
;
782 atomic_inc(&mddev
->pending_writes
);
783 submit_bio(REQ_WRITE
| REQ_SYNC
| REQ_UNPLUG
| REQ_FLUSH
| REQ_FUA
,
787 void md_super_wait(mddev_t
*mddev
)
789 /* wait for all superblock writes that were scheduled to complete */
792 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
793 if (atomic_read(&mddev
->pending_writes
)==0)
797 finish_wait(&mddev
->sb_wait
, &wq
);
800 static void bi_complete(struct bio
*bio
, int error
)
802 complete((struct completion
*)bio
->bi_private
);
805 int sync_page_io(mdk_rdev_t
*rdev
, sector_t sector
, int size
,
806 struct page
*page
, int rw
)
808 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
809 struct completion event
;
812 rw
|= REQ_SYNC
| REQ_UNPLUG
;
814 bio
->bi_bdev
= rdev
->bdev
;
815 bio
->bi_sector
= sector
;
816 bio_add_page(bio
, page
, size
, 0);
817 init_completion(&event
);
818 bio
->bi_private
= &event
;
819 bio
->bi_end_io
= bi_complete
;
821 wait_for_completion(&event
);
823 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
827 EXPORT_SYMBOL_GPL(sync_page_io
);
829 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
831 char b
[BDEVNAME_SIZE
];
832 if (!rdev
->sb_page
) {
840 if (!sync_page_io(rdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
846 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
847 bdevname(rdev
->bdev
,b
));
851 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
853 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
854 sb1
->set_uuid1
== sb2
->set_uuid1
&&
855 sb1
->set_uuid2
== sb2
->set_uuid2
&&
856 sb1
->set_uuid3
== sb2
->set_uuid3
;
859 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
862 mdp_super_t
*tmp1
, *tmp2
;
864 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
865 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
867 if (!tmp1
|| !tmp2
) {
869 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
877 * nr_disks is not constant
882 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
890 static u32
md_csum_fold(u32 csum
)
892 csum
= (csum
& 0xffff) + (csum
>> 16);
893 return (csum
& 0xffff) + (csum
>> 16);
896 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
899 u32
*sb32
= (u32
*)sb
;
901 unsigned int disk_csum
, csum
;
903 disk_csum
= sb
->sb_csum
;
906 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
908 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
912 /* This used to use csum_partial, which was wrong for several
913 * reasons including that different results are returned on
914 * different architectures. It isn't critical that we get exactly
915 * the same return value as before (we always csum_fold before
916 * testing, and that removes any differences). However as we
917 * know that csum_partial always returned a 16bit value on
918 * alphas, do a fold to maximise conformity to previous behaviour.
920 sb
->sb_csum
= md_csum_fold(disk_csum
);
922 sb
->sb_csum
= disk_csum
;
929 * Handle superblock details.
930 * We want to be able to handle multiple superblock formats
931 * so we have a common interface to them all, and an array of
932 * different handlers.
933 * We rely on user-space to write the initial superblock, and support
934 * reading and updating of superblocks.
935 * Interface methods are:
936 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
937 * loads and validates a superblock on dev.
938 * if refdev != NULL, compare superblocks on both devices
940 * 0 - dev has a superblock that is compatible with refdev
941 * 1 - dev has a superblock that is compatible and newer than refdev
942 * so dev should be used as the refdev in future
943 * -EINVAL superblock incompatible or invalid
944 * -othererror e.g. -EIO
946 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
947 * Verify that dev is acceptable into mddev.
948 * The first time, mddev->raid_disks will be 0, and data from
949 * dev should be merged in. Subsequent calls check that dev
950 * is new enough. Return 0 or -EINVAL
952 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
953 * Update the superblock for rdev with data in mddev
954 * This does not write to disc.
960 struct module
*owner
;
961 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
963 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
964 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
965 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
966 sector_t num_sectors
);
970 * Check that the given mddev has no bitmap.
972 * This function is called from the run method of all personalities that do not
973 * support bitmaps. It prints an error message and returns non-zero if mddev
974 * has a bitmap. Otherwise, it returns 0.
977 int md_check_no_bitmap(mddev_t
*mddev
)
979 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
981 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
982 mdname(mddev
), mddev
->pers
->name
);
985 EXPORT_SYMBOL(md_check_no_bitmap
);
988 * load_super for 0.90.0
990 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
992 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
997 * Calculate the position of the superblock (512byte sectors),
998 * it's at the end of the disk.
1000 * It also happens to be a multiple of 4Kb.
1002 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1004 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1005 if (ret
) return ret
;
1009 bdevname(rdev
->bdev
, b
);
1010 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1012 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1013 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1018 if (sb
->major_version
!= 0 ||
1019 sb
->minor_version
< 90 ||
1020 sb
->minor_version
> 91) {
1021 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1022 sb
->major_version
, sb
->minor_version
,
1027 if (sb
->raid_disks
<= 0)
1030 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1031 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1036 rdev
->preferred_minor
= sb
->md_minor
;
1037 rdev
->data_offset
= 0;
1038 rdev
->sb_size
= MD_SB_BYTES
;
1040 if (sb
->level
== LEVEL_MULTIPATH
)
1043 rdev
->desc_nr
= sb
->this_disk
.number
;
1049 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
1050 if (!uuid_equal(refsb
, sb
)) {
1051 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1052 b
, bdevname(refdev
->bdev
,b2
));
1055 if (!sb_equal(refsb
, sb
)) {
1056 printk(KERN_WARNING
"md: %s has same UUID"
1057 " but different superblock to %s\n",
1058 b
, bdevname(refdev
->bdev
, b2
));
1062 ev2
= md_event(refsb
);
1068 rdev
->sectors
= rdev
->sb_start
;
1070 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
1071 /* "this cannot possibly happen" ... */
1079 * validate_super for 0.90.0
1081 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1084 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1085 __u64 ev1
= md_event(sb
);
1087 rdev
->raid_disk
= -1;
1088 clear_bit(Faulty
, &rdev
->flags
);
1089 clear_bit(In_sync
, &rdev
->flags
);
1090 clear_bit(WriteMostly
, &rdev
->flags
);
1092 if (mddev
->raid_disks
== 0) {
1093 mddev
->major_version
= 0;
1094 mddev
->minor_version
= sb
->minor_version
;
1095 mddev
->patch_version
= sb
->patch_version
;
1096 mddev
->external
= 0;
1097 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1098 mddev
->ctime
= sb
->ctime
;
1099 mddev
->utime
= sb
->utime
;
1100 mddev
->level
= sb
->level
;
1101 mddev
->clevel
[0] = 0;
1102 mddev
->layout
= sb
->layout
;
1103 mddev
->raid_disks
= sb
->raid_disks
;
1104 mddev
->dev_sectors
= sb
->size
* 2;
1105 mddev
->events
= ev1
;
1106 mddev
->bitmap_info
.offset
= 0;
1107 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1109 if (mddev
->minor_version
>= 91) {
1110 mddev
->reshape_position
= sb
->reshape_position
;
1111 mddev
->delta_disks
= sb
->delta_disks
;
1112 mddev
->new_level
= sb
->new_level
;
1113 mddev
->new_layout
= sb
->new_layout
;
1114 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1116 mddev
->reshape_position
= MaxSector
;
1117 mddev
->delta_disks
= 0;
1118 mddev
->new_level
= mddev
->level
;
1119 mddev
->new_layout
= mddev
->layout
;
1120 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1123 if (sb
->state
& (1<<MD_SB_CLEAN
))
1124 mddev
->recovery_cp
= MaxSector
;
1126 if (sb
->events_hi
== sb
->cp_events_hi
&&
1127 sb
->events_lo
== sb
->cp_events_lo
) {
1128 mddev
->recovery_cp
= sb
->recovery_cp
;
1130 mddev
->recovery_cp
= 0;
1133 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1134 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1135 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1136 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1138 mddev
->max_disks
= MD_SB_DISKS
;
1140 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1141 mddev
->bitmap_info
.file
== NULL
)
1142 mddev
->bitmap_info
.offset
=
1143 mddev
->bitmap_info
.default_offset
;
1145 } else if (mddev
->pers
== NULL
) {
1146 /* Insist on good event counter while assembling, except
1147 * for spares (which don't need an event count) */
1149 if (sb
->disks
[rdev
->desc_nr
].state
& (
1150 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1151 if (ev1
< mddev
->events
)
1153 } else if (mddev
->bitmap
) {
1154 /* if adding to array with a bitmap, then we can accept an
1155 * older device ... but not too old.
1157 if (ev1
< mddev
->bitmap
->events_cleared
)
1160 if (ev1
< mddev
->events
)
1161 /* just a hot-add of a new device, leave raid_disk at -1 */
1165 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1166 desc
= sb
->disks
+ rdev
->desc_nr
;
1168 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1169 set_bit(Faulty
, &rdev
->flags
);
1170 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1171 desc->raid_disk < mddev->raid_disks */) {
1172 set_bit(In_sync
, &rdev
->flags
);
1173 rdev
->raid_disk
= desc
->raid_disk
;
1174 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1175 /* active but not in sync implies recovery up to
1176 * reshape position. We don't know exactly where
1177 * that is, so set to zero for now */
1178 if (mddev
->minor_version
>= 91) {
1179 rdev
->recovery_offset
= 0;
1180 rdev
->raid_disk
= desc
->raid_disk
;
1183 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1184 set_bit(WriteMostly
, &rdev
->flags
);
1185 } else /* MULTIPATH are always insync */
1186 set_bit(In_sync
, &rdev
->flags
);
1191 * sync_super for 0.90.0
1193 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1197 int next_spare
= mddev
->raid_disks
;
1200 /* make rdev->sb match mddev data..
1203 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1204 * 3/ any empty disks < next_spare become removed
1206 * disks[0] gets initialised to REMOVED because
1207 * we cannot be sure from other fields if it has
1208 * been initialised or not.
1211 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1213 rdev
->sb_size
= MD_SB_BYTES
;
1215 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1217 memset(sb
, 0, sizeof(*sb
));
1219 sb
->md_magic
= MD_SB_MAGIC
;
1220 sb
->major_version
= mddev
->major_version
;
1221 sb
->patch_version
= mddev
->patch_version
;
1222 sb
->gvalid_words
= 0; /* ignored */
1223 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1224 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1225 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1226 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1228 sb
->ctime
= mddev
->ctime
;
1229 sb
->level
= mddev
->level
;
1230 sb
->size
= mddev
->dev_sectors
/ 2;
1231 sb
->raid_disks
= mddev
->raid_disks
;
1232 sb
->md_minor
= mddev
->md_minor
;
1233 sb
->not_persistent
= 0;
1234 sb
->utime
= mddev
->utime
;
1236 sb
->events_hi
= (mddev
->events
>>32);
1237 sb
->events_lo
= (u32
)mddev
->events
;
1239 if (mddev
->reshape_position
== MaxSector
)
1240 sb
->minor_version
= 90;
1242 sb
->minor_version
= 91;
1243 sb
->reshape_position
= mddev
->reshape_position
;
1244 sb
->new_level
= mddev
->new_level
;
1245 sb
->delta_disks
= mddev
->delta_disks
;
1246 sb
->new_layout
= mddev
->new_layout
;
1247 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1249 mddev
->minor_version
= sb
->minor_version
;
1252 sb
->recovery_cp
= mddev
->recovery_cp
;
1253 sb
->cp_events_hi
= (mddev
->events
>>32);
1254 sb
->cp_events_lo
= (u32
)mddev
->events
;
1255 if (mddev
->recovery_cp
== MaxSector
)
1256 sb
->state
= (1<< MD_SB_CLEAN
);
1258 sb
->recovery_cp
= 0;
1260 sb
->layout
= mddev
->layout
;
1261 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1263 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1264 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1266 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1267 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1270 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1272 if (rdev2
->raid_disk
>= 0 &&
1273 sb
->minor_version
>= 91)
1274 /* we have nowhere to store the recovery_offset,
1275 * but if it is not below the reshape_position,
1276 * we can piggy-back on that.
1279 if (rdev2
->raid_disk
< 0 ||
1280 test_bit(Faulty
, &rdev2
->flags
))
1283 desc_nr
= rdev2
->raid_disk
;
1285 desc_nr
= next_spare
++;
1286 rdev2
->desc_nr
= desc_nr
;
1287 d
= &sb
->disks
[rdev2
->desc_nr
];
1289 d
->number
= rdev2
->desc_nr
;
1290 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1291 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1293 d
->raid_disk
= rdev2
->raid_disk
;
1295 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1296 if (test_bit(Faulty
, &rdev2
->flags
))
1297 d
->state
= (1<<MD_DISK_FAULTY
);
1298 else if (is_active
) {
1299 d
->state
= (1<<MD_DISK_ACTIVE
);
1300 if (test_bit(In_sync
, &rdev2
->flags
))
1301 d
->state
|= (1<<MD_DISK_SYNC
);
1309 if (test_bit(WriteMostly
, &rdev2
->flags
))
1310 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1312 /* now set the "removed" and "faulty" bits on any missing devices */
1313 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1314 mdp_disk_t
*d
= &sb
->disks
[i
];
1315 if (d
->state
== 0 && d
->number
== 0) {
1318 d
->state
= (1<<MD_DISK_REMOVED
);
1319 d
->state
|= (1<<MD_DISK_FAULTY
);
1323 sb
->nr_disks
= nr_disks
;
1324 sb
->active_disks
= active
;
1325 sb
->working_disks
= working
;
1326 sb
->failed_disks
= failed
;
1327 sb
->spare_disks
= spare
;
1329 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1330 sb
->sb_csum
= calc_sb_csum(sb
);
1334 * rdev_size_change for 0.90.0
1336 static unsigned long long
1337 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1339 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1340 return 0; /* component must fit device */
1341 if (rdev
->mddev
->bitmap_info
.offset
)
1342 return 0; /* can't move bitmap */
1343 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1344 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1345 num_sectors
= rdev
->sb_start
;
1346 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1348 md_super_wait(rdev
->mddev
);
1354 * version 1 superblock
1357 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1361 unsigned long long newcsum
;
1362 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1363 __le32
*isuper
= (__le32
*)sb
;
1366 disk_csum
= sb
->sb_csum
;
1369 for (i
=0; size
>=4; size
-= 4 )
1370 newcsum
+= le32_to_cpu(*isuper
++);
1373 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1375 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1376 sb
->sb_csum
= disk_csum
;
1377 return cpu_to_le32(csum
);
1380 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1382 struct mdp_superblock_1
*sb
;
1385 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1389 * Calculate the position of the superblock in 512byte sectors.
1390 * It is always aligned to a 4K boundary and
1391 * depeding on minor_version, it can be:
1392 * 0: At least 8K, but less than 12K, from end of device
1393 * 1: At start of device
1394 * 2: 4K from start of device.
1396 switch(minor_version
) {
1398 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1400 sb_start
&= ~(sector_t
)(4*2-1);
1411 rdev
->sb_start
= sb_start
;
1413 /* superblock is rarely larger than 1K, but it can be larger,
1414 * and it is safe to read 4k, so we do that
1416 ret
= read_disk_sb(rdev
, 4096);
1417 if (ret
) return ret
;
1420 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1422 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1423 sb
->major_version
!= cpu_to_le32(1) ||
1424 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1425 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1426 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1429 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1430 printk("md: invalid superblock checksum on %s\n",
1431 bdevname(rdev
->bdev
,b
));
1434 if (le64_to_cpu(sb
->data_size
) < 10) {
1435 printk("md: data_size too small on %s\n",
1436 bdevname(rdev
->bdev
,b
));
1440 rdev
->preferred_minor
= 0xffff;
1441 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1442 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1444 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1445 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1446 if (rdev
->sb_size
& bmask
)
1447 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1450 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1453 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1456 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1462 struct mdp_superblock_1
*refsb
=
1463 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1465 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1466 sb
->level
!= refsb
->level
||
1467 sb
->layout
!= refsb
->layout
||
1468 sb
->chunksize
!= refsb
->chunksize
) {
1469 printk(KERN_WARNING
"md: %s has strangely different"
1470 " superblock to %s\n",
1471 bdevname(rdev
->bdev
,b
),
1472 bdevname(refdev
->bdev
,b2
));
1475 ev1
= le64_to_cpu(sb
->events
);
1476 ev2
= le64_to_cpu(refsb
->events
);
1484 rdev
->sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
1485 le64_to_cpu(sb
->data_offset
);
1487 rdev
->sectors
= rdev
->sb_start
;
1488 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1490 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1491 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1496 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1498 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1499 __u64 ev1
= le64_to_cpu(sb
->events
);
1501 rdev
->raid_disk
= -1;
1502 clear_bit(Faulty
, &rdev
->flags
);
1503 clear_bit(In_sync
, &rdev
->flags
);
1504 clear_bit(WriteMostly
, &rdev
->flags
);
1506 if (mddev
->raid_disks
== 0) {
1507 mddev
->major_version
= 1;
1508 mddev
->patch_version
= 0;
1509 mddev
->external
= 0;
1510 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1511 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1512 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1513 mddev
->level
= le32_to_cpu(sb
->level
);
1514 mddev
->clevel
[0] = 0;
1515 mddev
->layout
= le32_to_cpu(sb
->layout
);
1516 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1517 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1518 mddev
->events
= ev1
;
1519 mddev
->bitmap_info
.offset
= 0;
1520 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1522 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1523 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1525 mddev
->max_disks
= (4096-256)/2;
1527 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1528 mddev
->bitmap_info
.file
== NULL
)
1529 mddev
->bitmap_info
.offset
=
1530 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1532 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1533 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1534 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1535 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1536 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1537 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1539 mddev
->reshape_position
= MaxSector
;
1540 mddev
->delta_disks
= 0;
1541 mddev
->new_level
= mddev
->level
;
1542 mddev
->new_layout
= mddev
->layout
;
1543 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1546 } else if (mddev
->pers
== NULL
) {
1547 /* Insist of good event counter while assembling, except for
1548 * spares (which don't need an event count) */
1550 if (rdev
->desc_nr
>= 0 &&
1551 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1552 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1553 if (ev1
< mddev
->events
)
1555 } else if (mddev
->bitmap
) {
1556 /* If adding to array with a bitmap, then we can accept an
1557 * older device, but not too old.
1559 if (ev1
< mddev
->bitmap
->events_cleared
)
1562 if (ev1
< mddev
->events
)
1563 /* just a hot-add of a new device, leave raid_disk at -1 */
1566 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1568 if (rdev
->desc_nr
< 0 ||
1569 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1573 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1575 case 0xffff: /* spare */
1577 case 0xfffe: /* faulty */
1578 set_bit(Faulty
, &rdev
->flags
);
1581 if ((le32_to_cpu(sb
->feature_map
) &
1582 MD_FEATURE_RECOVERY_OFFSET
))
1583 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1585 set_bit(In_sync
, &rdev
->flags
);
1586 rdev
->raid_disk
= role
;
1589 if (sb
->devflags
& WriteMostly1
)
1590 set_bit(WriteMostly
, &rdev
->flags
);
1591 } else /* MULTIPATH are always insync */
1592 set_bit(In_sync
, &rdev
->flags
);
1597 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1599 struct mdp_superblock_1
*sb
;
1602 /* make rdev->sb match mddev and rdev data. */
1604 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1606 sb
->feature_map
= 0;
1608 sb
->recovery_offset
= cpu_to_le64(0);
1609 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1610 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1611 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1613 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1614 sb
->events
= cpu_to_le64(mddev
->events
);
1616 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1618 sb
->resync_offset
= cpu_to_le64(0);
1620 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1622 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1623 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1624 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1625 sb
->level
= cpu_to_le32(mddev
->level
);
1626 sb
->layout
= cpu_to_le32(mddev
->layout
);
1628 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1629 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1630 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1633 if (rdev
->raid_disk
>= 0 &&
1634 !test_bit(In_sync
, &rdev
->flags
)) {
1636 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1637 sb
->recovery_offset
=
1638 cpu_to_le64(rdev
->recovery_offset
);
1641 if (mddev
->reshape_position
!= MaxSector
) {
1642 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1643 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1644 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1645 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1646 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1647 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1651 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1652 if (rdev2
->desc_nr
+1 > max_dev
)
1653 max_dev
= rdev2
->desc_nr
+1;
1655 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1657 sb
->max_dev
= cpu_to_le32(max_dev
);
1658 rdev
->sb_size
= max_dev
* 2 + 256;
1659 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1660 if (rdev
->sb_size
& bmask
)
1661 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1663 max_dev
= le32_to_cpu(sb
->max_dev
);
1665 for (i
=0; i
<max_dev
;i
++)
1666 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1668 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1670 if (test_bit(Faulty
, &rdev2
->flags
))
1671 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1672 else if (test_bit(In_sync
, &rdev2
->flags
))
1673 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1674 else if (rdev2
->raid_disk
>= 0)
1675 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1677 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1680 sb
->sb_csum
= calc_sb_1_csum(sb
);
1683 static unsigned long long
1684 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1686 struct mdp_superblock_1
*sb
;
1687 sector_t max_sectors
;
1688 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1689 return 0; /* component must fit device */
1690 if (rdev
->sb_start
< rdev
->data_offset
) {
1691 /* minor versions 1 and 2; superblock before data */
1692 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1693 max_sectors
-= rdev
->data_offset
;
1694 if (!num_sectors
|| num_sectors
> max_sectors
)
1695 num_sectors
= max_sectors
;
1696 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1697 /* minor version 0 with bitmap we can't move */
1700 /* minor version 0; superblock after data */
1702 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1703 sb_start
&= ~(sector_t
)(4*2 - 1);
1704 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1705 if (!num_sectors
|| num_sectors
> max_sectors
)
1706 num_sectors
= max_sectors
;
1707 rdev
->sb_start
= sb_start
;
1709 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1710 sb
->data_size
= cpu_to_le64(num_sectors
);
1711 sb
->super_offset
= rdev
->sb_start
;
1712 sb
->sb_csum
= calc_sb_1_csum(sb
);
1713 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1715 md_super_wait(rdev
->mddev
);
1719 static struct super_type super_types
[] = {
1722 .owner
= THIS_MODULE
,
1723 .load_super
= super_90_load
,
1724 .validate_super
= super_90_validate
,
1725 .sync_super
= super_90_sync
,
1726 .rdev_size_change
= super_90_rdev_size_change
,
1730 .owner
= THIS_MODULE
,
1731 .load_super
= super_1_load
,
1732 .validate_super
= super_1_validate
,
1733 .sync_super
= super_1_sync
,
1734 .rdev_size_change
= super_1_rdev_size_change
,
1738 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1740 mdk_rdev_t
*rdev
, *rdev2
;
1743 rdev_for_each_rcu(rdev
, mddev1
)
1744 rdev_for_each_rcu(rdev2
, mddev2
)
1745 if (rdev
->bdev
->bd_contains
==
1746 rdev2
->bdev
->bd_contains
) {
1754 static LIST_HEAD(pending_raid_disks
);
1757 * Try to register data integrity profile for an mddev
1759 * This is called when an array is started and after a disk has been kicked
1760 * from the array. It only succeeds if all working and active component devices
1761 * are integrity capable with matching profiles.
1763 int md_integrity_register(mddev_t
*mddev
)
1765 mdk_rdev_t
*rdev
, *reference
= NULL
;
1767 if (list_empty(&mddev
->disks
))
1768 return 0; /* nothing to do */
1769 if (blk_get_integrity(mddev
->gendisk
))
1770 return 0; /* already registered */
1771 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1772 /* skip spares and non-functional disks */
1773 if (test_bit(Faulty
, &rdev
->flags
))
1775 if (rdev
->raid_disk
< 0)
1778 * If at least one rdev is not integrity capable, we can not
1779 * enable data integrity for the md device.
1781 if (!bdev_get_integrity(rdev
->bdev
))
1784 /* Use the first rdev as the reference */
1788 /* does this rdev's profile match the reference profile? */
1789 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1790 rdev
->bdev
->bd_disk
) < 0)
1794 * All component devices are integrity capable and have matching
1795 * profiles, register the common profile for the md device.
1797 if (blk_integrity_register(mddev
->gendisk
,
1798 bdev_get_integrity(reference
->bdev
)) != 0) {
1799 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1803 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1807 EXPORT_SYMBOL(md_integrity_register
);
1809 /* Disable data integrity if non-capable/non-matching disk is being added */
1810 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1812 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1813 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1815 if (!bi_mddev
) /* nothing to do */
1817 if (rdev
->raid_disk
< 0) /* skip spares */
1819 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1820 rdev
->bdev
->bd_disk
) >= 0)
1822 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1823 blk_integrity_unregister(mddev
->gendisk
);
1825 EXPORT_SYMBOL(md_integrity_add_rdev
);
1827 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1829 char b
[BDEVNAME_SIZE
];
1839 /* prevent duplicates */
1840 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1843 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1844 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1845 rdev
->sectors
< mddev
->dev_sectors
)) {
1847 /* Cannot change size, so fail
1848 * If mddev->level <= 0, then we don't care
1849 * about aligning sizes (e.g. linear)
1851 if (mddev
->level
> 0)
1854 mddev
->dev_sectors
= rdev
->sectors
;
1857 /* Verify rdev->desc_nr is unique.
1858 * If it is -1, assign a free number, else
1859 * check number is not in use
1861 if (rdev
->desc_nr
< 0) {
1863 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1864 while (find_rdev_nr(mddev
, choice
))
1866 rdev
->desc_nr
= choice
;
1868 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1871 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1872 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1873 mdname(mddev
), mddev
->max_disks
);
1876 bdevname(rdev
->bdev
,b
);
1877 while ( (s
=strchr(b
, '/')) != NULL
)
1880 rdev
->mddev
= mddev
;
1881 printk(KERN_INFO
"md: bind<%s>\n", b
);
1883 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1886 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1887 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1888 /* failure here is OK */;
1889 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1891 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1892 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1894 /* May as well allow recovery to be retried once */
1895 mddev
->recovery_disabled
= 0;
1900 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1905 static void md_delayed_delete(struct work_struct
*ws
)
1907 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1908 kobject_del(&rdev
->kobj
);
1909 kobject_put(&rdev
->kobj
);
1912 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1914 char b
[BDEVNAME_SIZE
];
1919 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1920 list_del_rcu(&rdev
->same_set
);
1921 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1923 sysfs_remove_link(&rdev
->kobj
, "block");
1924 sysfs_put(rdev
->sysfs_state
);
1925 rdev
->sysfs_state
= NULL
;
1926 /* We need to delay this, otherwise we can deadlock when
1927 * writing to 'remove' to "dev/state". We also need
1928 * to delay it due to rcu usage.
1931 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1932 kobject_get(&rdev
->kobj
);
1933 queue_work(md_misc_wq
, &rdev
->del_work
);
1937 * prevent the device from being mounted, repartitioned or
1938 * otherwise reused by a RAID array (or any other kernel
1939 * subsystem), by bd_claiming the device.
1941 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1944 struct block_device
*bdev
;
1945 char b
[BDEVNAME_SIZE
];
1947 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1949 printk(KERN_ERR
"md: could not open %s.\n",
1950 __bdevname(dev
, b
));
1951 return PTR_ERR(bdev
);
1953 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1955 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1957 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1961 set_bit(AllReserved
, &rdev
->flags
);
1966 static void unlock_rdev(mdk_rdev_t
*rdev
)
1968 struct block_device
*bdev
= rdev
->bdev
;
1973 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1976 void md_autodetect_dev(dev_t dev
);
1978 static void export_rdev(mdk_rdev_t
* rdev
)
1980 char b
[BDEVNAME_SIZE
];
1981 printk(KERN_INFO
"md: export_rdev(%s)\n",
1982 bdevname(rdev
->bdev
,b
));
1987 if (test_bit(AutoDetected
, &rdev
->flags
))
1988 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1991 kobject_put(&rdev
->kobj
);
1994 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1996 unbind_rdev_from_array(rdev
);
2000 static void export_array(mddev_t
*mddev
)
2002 mdk_rdev_t
*rdev
, *tmp
;
2004 rdev_for_each(rdev
, tmp
, mddev
) {
2009 kick_rdev_from_array(rdev
);
2011 if (!list_empty(&mddev
->disks
))
2013 mddev
->raid_disks
= 0;
2014 mddev
->major_version
= 0;
2017 static void print_desc(mdp_disk_t
*desc
)
2019 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2020 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2023 static void print_sb_90(mdp_super_t
*sb
)
2028 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2029 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2030 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2032 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2033 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2034 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2035 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2036 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2037 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2038 sb
->failed_disks
, sb
->spare_disks
,
2039 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2042 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2045 desc
= sb
->disks
+ i
;
2046 if (desc
->number
|| desc
->major
|| desc
->minor
||
2047 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2048 printk(" D %2d: ", i
);
2052 printk(KERN_INFO
"md: THIS: ");
2053 print_desc(&sb
->this_disk
);
2056 static void print_sb_1(struct mdp_superblock_1
*sb
)
2060 uuid
= sb
->set_uuid
;
2062 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2063 "md: Name: \"%s\" CT:%llu\n",
2064 le32_to_cpu(sb
->major_version
),
2065 le32_to_cpu(sb
->feature_map
),
2068 (unsigned long long)le64_to_cpu(sb
->ctime
)
2069 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2071 uuid
= sb
->device_uuid
;
2073 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2075 "md: Dev:%08x UUID: %pU\n"
2076 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2077 "md: (MaxDev:%u) \n",
2078 le32_to_cpu(sb
->level
),
2079 (unsigned long long)le64_to_cpu(sb
->size
),
2080 le32_to_cpu(sb
->raid_disks
),
2081 le32_to_cpu(sb
->layout
),
2082 le32_to_cpu(sb
->chunksize
),
2083 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2084 (unsigned long long)le64_to_cpu(sb
->data_size
),
2085 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2086 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2087 le32_to_cpu(sb
->dev_number
),
2090 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2091 (unsigned long long)le64_to_cpu(sb
->events
),
2092 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2093 le32_to_cpu(sb
->sb_csum
),
2094 le32_to_cpu(sb
->max_dev
)
2098 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2100 char b
[BDEVNAME_SIZE
];
2101 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2102 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2103 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2105 if (rdev
->sb_loaded
) {
2106 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2107 switch (major_version
) {
2109 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2112 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2116 printk(KERN_INFO
"md: no rdev superblock!\n");
2119 static void md_print_devices(void)
2121 struct list_head
*tmp
;
2124 char b
[BDEVNAME_SIZE
];
2127 printk("md: **********************************\n");
2128 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2129 printk("md: **********************************\n");
2130 for_each_mddev(mddev
, tmp
) {
2133 bitmap_print_sb(mddev
->bitmap
);
2135 printk("%s: ", mdname(mddev
));
2136 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2137 printk("<%s>", bdevname(rdev
->bdev
,b
));
2140 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2141 print_rdev(rdev
, mddev
->major_version
);
2143 printk("md: **********************************\n");
2148 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2150 /* Update each superblock (in-memory image), but
2151 * if we are allowed to, skip spares which already
2152 * have the right event counter, or have one earlier
2153 * (which would mean they aren't being marked as dirty
2154 * with the rest of the array)
2157 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2158 if (rdev
->sb_events
== mddev
->events
||
2160 rdev
->raid_disk
< 0 &&
2161 rdev
->sb_events
+1 == mddev
->events
)) {
2162 /* Don't update this superblock */
2163 rdev
->sb_loaded
= 2;
2165 super_types
[mddev
->major_version
].
2166 sync_super(mddev
, rdev
);
2167 rdev
->sb_loaded
= 1;
2172 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2179 /* First make sure individual recovery_offsets are correct */
2180 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2181 if (rdev
->raid_disk
>= 0 &&
2182 mddev
->delta_disks
>= 0 &&
2183 !test_bit(In_sync
, &rdev
->flags
) &&
2184 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2185 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2188 if (!mddev
->persistent
) {
2189 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2190 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2191 if (!mddev
->external
)
2192 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2193 wake_up(&mddev
->sb_wait
);
2197 spin_lock_irq(&mddev
->write_lock
);
2199 mddev
->utime
= get_seconds();
2201 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2203 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2204 /* just a clean<-> dirty transition, possibly leave spares alone,
2205 * though if events isn't the right even/odd, we will have to do
2211 if (mddev
->degraded
)
2212 /* If the array is degraded, then skipping spares is both
2213 * dangerous and fairly pointless.
2214 * Dangerous because a device that was removed from the array
2215 * might have a event_count that still looks up-to-date,
2216 * so it can be re-added without a resync.
2217 * Pointless because if there are any spares to skip,
2218 * then a recovery will happen and soon that array won't
2219 * be degraded any more and the spare can go back to sleep then.
2223 sync_req
= mddev
->in_sync
;
2225 /* If this is just a dirty<->clean transition, and the array is clean
2226 * and 'events' is odd, we can roll back to the previous clean state */
2228 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2229 && mddev
->can_decrease_events
2230 && mddev
->events
!= 1) {
2232 mddev
->can_decrease_events
= 0;
2234 /* otherwise we have to go forward and ... */
2236 mddev
->can_decrease_events
= nospares
;
2239 if (!mddev
->events
) {
2241 * oops, this 64-bit counter should never wrap.
2242 * Either we are in around ~1 trillion A.C., assuming
2243 * 1 reboot per second, or we have a bug:
2248 sync_sbs(mddev
, nospares
);
2249 spin_unlock_irq(&mddev
->write_lock
);
2252 "md: updating %s RAID superblock on device (in sync %d)\n",
2253 mdname(mddev
),mddev
->in_sync
);
2255 bitmap_update_sb(mddev
->bitmap
);
2256 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2257 char b
[BDEVNAME_SIZE
];
2258 dprintk(KERN_INFO
"md: ");
2259 if (rdev
->sb_loaded
!= 1)
2260 continue; /* no noise on spare devices */
2261 if (test_bit(Faulty
, &rdev
->flags
))
2262 dprintk("(skipping faulty ");
2264 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2265 if (!test_bit(Faulty
, &rdev
->flags
)) {
2266 md_super_write(mddev
,rdev
,
2267 rdev
->sb_start
, rdev
->sb_size
,
2269 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2270 bdevname(rdev
->bdev
,b
),
2271 (unsigned long long)rdev
->sb_start
);
2272 rdev
->sb_events
= mddev
->events
;
2276 if (mddev
->level
== LEVEL_MULTIPATH
)
2277 /* only need to write one superblock... */
2280 md_super_wait(mddev
);
2281 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2283 spin_lock_irq(&mddev
->write_lock
);
2284 if (mddev
->in_sync
!= sync_req
||
2285 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2286 /* have to write it out again */
2287 spin_unlock_irq(&mddev
->write_lock
);
2290 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2291 spin_unlock_irq(&mddev
->write_lock
);
2292 wake_up(&mddev
->sb_wait
);
2293 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2294 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2298 /* words written to sysfs files may, or may not, be \n terminated.
2299 * We want to accept with case. For this we use cmd_match.
2301 static int cmd_match(const char *cmd
, const char *str
)
2303 /* See if cmd, written into a sysfs file, matches
2304 * str. They must either be the same, or cmd can
2305 * have a trailing newline
2307 while (*cmd
&& *str
&& *cmd
== *str
) {
2318 struct rdev_sysfs_entry
{
2319 struct attribute attr
;
2320 ssize_t (*show
)(mdk_rdev_t
*, char *);
2321 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2325 state_show(mdk_rdev_t
*rdev
, char *page
)
2330 if (test_bit(Faulty
, &rdev
->flags
)) {
2331 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2334 if (test_bit(In_sync
, &rdev
->flags
)) {
2335 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2338 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2339 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2342 if (test_bit(Blocked
, &rdev
->flags
)) {
2343 len
+= sprintf(page
+len
, "%sblocked", sep
);
2346 if (!test_bit(Faulty
, &rdev
->flags
) &&
2347 !test_bit(In_sync
, &rdev
->flags
)) {
2348 len
+= sprintf(page
+len
, "%sspare", sep
);
2351 return len
+sprintf(page
+len
, "\n");
2355 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2358 * faulty - simulates and error
2359 * remove - disconnects the device
2360 * writemostly - sets write_mostly
2361 * -writemostly - clears write_mostly
2362 * blocked - sets the Blocked flag
2363 * -blocked - clears the Blocked flag
2364 * insync - sets Insync providing device isn't active
2367 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2368 md_error(rdev
->mddev
, rdev
);
2370 } else if (cmd_match(buf
, "remove")) {
2371 if (rdev
->raid_disk
>= 0)
2374 mddev_t
*mddev
= rdev
->mddev
;
2375 kick_rdev_from_array(rdev
);
2377 md_update_sb(mddev
, 1);
2378 md_new_event(mddev
);
2381 } else if (cmd_match(buf
, "writemostly")) {
2382 set_bit(WriteMostly
, &rdev
->flags
);
2384 } else if (cmd_match(buf
, "-writemostly")) {
2385 clear_bit(WriteMostly
, &rdev
->flags
);
2387 } else if (cmd_match(buf
, "blocked")) {
2388 set_bit(Blocked
, &rdev
->flags
);
2390 } else if (cmd_match(buf
, "-blocked")) {
2391 clear_bit(Blocked
, &rdev
->flags
);
2392 wake_up(&rdev
->blocked_wait
);
2393 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2394 md_wakeup_thread(rdev
->mddev
->thread
);
2397 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2398 set_bit(In_sync
, &rdev
->flags
);
2402 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2403 return err
? err
: len
;
2405 static struct rdev_sysfs_entry rdev_state
=
2406 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2409 errors_show(mdk_rdev_t
*rdev
, char *page
)
2411 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2415 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2418 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2419 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2420 atomic_set(&rdev
->corrected_errors
, n
);
2425 static struct rdev_sysfs_entry rdev_errors
=
2426 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2429 slot_show(mdk_rdev_t
*rdev
, char *page
)
2431 if (rdev
->raid_disk
< 0)
2432 return sprintf(page
, "none\n");
2434 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2438 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2443 int slot
= simple_strtoul(buf
, &e
, 10);
2444 if (strncmp(buf
, "none", 4)==0)
2446 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2448 if (rdev
->mddev
->pers
&& slot
== -1) {
2449 /* Setting 'slot' on an active array requires also
2450 * updating the 'rd%d' link, and communicating
2451 * with the personality with ->hot_*_disk.
2452 * For now we only support removing
2453 * failed/spare devices. This normally happens automatically,
2454 * but not when the metadata is externally managed.
2456 if (rdev
->raid_disk
== -1)
2458 /* personality does all needed checks */
2459 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2461 err
= rdev
->mddev
->pers
->
2462 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2465 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2466 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2467 rdev
->raid_disk
= -1;
2468 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2469 md_wakeup_thread(rdev
->mddev
->thread
);
2470 } else if (rdev
->mddev
->pers
) {
2472 /* Activating a spare .. or possibly reactivating
2473 * if we ever get bitmaps working here.
2476 if (rdev
->raid_disk
!= -1)
2479 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2482 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2483 if (rdev2
->raid_disk
== slot
)
2486 rdev
->raid_disk
= slot
;
2487 if (test_bit(In_sync
, &rdev
->flags
))
2488 rdev
->saved_raid_disk
= slot
;
2490 rdev
->saved_raid_disk
= -1;
2491 err
= rdev
->mddev
->pers
->
2492 hot_add_disk(rdev
->mddev
, rdev
);
2494 rdev
->raid_disk
= -1;
2497 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2498 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2499 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2500 /* failure here is OK */;
2501 /* don't wakeup anyone, leave that to userspace. */
2503 if (slot
>= rdev
->mddev
->raid_disks
)
2505 rdev
->raid_disk
= slot
;
2506 /* assume it is working */
2507 clear_bit(Faulty
, &rdev
->flags
);
2508 clear_bit(WriteMostly
, &rdev
->flags
);
2509 set_bit(In_sync
, &rdev
->flags
);
2510 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2516 static struct rdev_sysfs_entry rdev_slot
=
2517 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2520 offset_show(mdk_rdev_t
*rdev
, char *page
)
2522 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2526 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2529 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2530 if (e
==buf
|| (*e
&& *e
!= '\n'))
2532 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2534 if (rdev
->sectors
&& rdev
->mddev
->external
)
2535 /* Must set offset before size, so overlap checks
2538 rdev
->data_offset
= offset
;
2542 static struct rdev_sysfs_entry rdev_offset
=
2543 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2546 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2548 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2551 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2553 /* check if two start/length pairs overlap */
2561 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2563 unsigned long long blocks
;
2566 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2569 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2570 return -EINVAL
; /* sector conversion overflow */
2573 if (new != blocks
* 2)
2574 return -EINVAL
; /* unsigned long long to sector_t overflow */
2581 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2583 mddev_t
*my_mddev
= rdev
->mddev
;
2584 sector_t oldsectors
= rdev
->sectors
;
2587 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2589 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2590 if (my_mddev
->persistent
) {
2591 sectors
= super_types
[my_mddev
->major_version
].
2592 rdev_size_change(rdev
, sectors
);
2595 } else if (!sectors
)
2596 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2599 if (sectors
< my_mddev
->dev_sectors
)
2600 return -EINVAL
; /* component must fit device */
2602 rdev
->sectors
= sectors
;
2603 if (sectors
> oldsectors
&& my_mddev
->external
) {
2604 /* need to check that all other rdevs with the same ->bdev
2605 * do not overlap. We need to unlock the mddev to avoid
2606 * a deadlock. We have already changed rdev->sectors, and if
2607 * we have to change it back, we will have the lock again.
2611 struct list_head
*tmp
;
2613 mddev_unlock(my_mddev
);
2614 for_each_mddev(mddev
, tmp
) {
2618 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2619 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2620 (rdev
->bdev
== rdev2
->bdev
&&
2622 overlaps(rdev
->data_offset
, rdev
->sectors
,
2628 mddev_unlock(mddev
);
2634 mddev_lock(my_mddev
);
2636 /* Someone else could have slipped in a size
2637 * change here, but doing so is just silly.
2638 * We put oldsectors back because we *know* it is
2639 * safe, and trust userspace not to race with
2642 rdev
->sectors
= oldsectors
;
2649 static struct rdev_sysfs_entry rdev_size
=
2650 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2653 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2655 unsigned long long recovery_start
= rdev
->recovery_offset
;
2657 if (test_bit(In_sync
, &rdev
->flags
) ||
2658 recovery_start
== MaxSector
)
2659 return sprintf(page
, "none\n");
2661 return sprintf(page
, "%llu\n", recovery_start
);
2664 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2666 unsigned long long recovery_start
;
2668 if (cmd_match(buf
, "none"))
2669 recovery_start
= MaxSector
;
2670 else if (strict_strtoull(buf
, 10, &recovery_start
))
2673 if (rdev
->mddev
->pers
&&
2674 rdev
->raid_disk
>= 0)
2677 rdev
->recovery_offset
= recovery_start
;
2678 if (recovery_start
== MaxSector
)
2679 set_bit(In_sync
, &rdev
->flags
);
2681 clear_bit(In_sync
, &rdev
->flags
);
2685 static struct rdev_sysfs_entry rdev_recovery_start
=
2686 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2688 static struct attribute
*rdev_default_attrs
[] = {
2694 &rdev_recovery_start
.attr
,
2698 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2700 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2701 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2702 mddev_t
*mddev
= rdev
->mddev
;
2708 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2710 if (rdev
->mddev
== NULL
)
2713 rv
= entry
->show(rdev
, page
);
2714 mddev_unlock(mddev
);
2720 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2721 const char *page
, size_t length
)
2723 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2724 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2726 mddev_t
*mddev
= rdev
->mddev
;
2730 if (!capable(CAP_SYS_ADMIN
))
2732 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2734 if (rdev
->mddev
== NULL
)
2737 rv
= entry
->store(rdev
, page
, length
);
2738 mddev_unlock(mddev
);
2743 static void rdev_free(struct kobject
*ko
)
2745 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2748 static const struct sysfs_ops rdev_sysfs_ops
= {
2749 .show
= rdev_attr_show
,
2750 .store
= rdev_attr_store
,
2752 static struct kobj_type rdev_ktype
= {
2753 .release
= rdev_free
,
2754 .sysfs_ops
= &rdev_sysfs_ops
,
2755 .default_attrs
= rdev_default_attrs
,
2758 void md_rdev_init(mdk_rdev_t
*rdev
)
2761 rdev
->saved_raid_disk
= -1;
2762 rdev
->raid_disk
= -1;
2764 rdev
->data_offset
= 0;
2765 rdev
->sb_events
= 0;
2766 rdev
->last_read_error
.tv_sec
= 0;
2767 rdev
->last_read_error
.tv_nsec
= 0;
2768 atomic_set(&rdev
->nr_pending
, 0);
2769 atomic_set(&rdev
->read_errors
, 0);
2770 atomic_set(&rdev
->corrected_errors
, 0);
2772 INIT_LIST_HEAD(&rdev
->same_set
);
2773 init_waitqueue_head(&rdev
->blocked_wait
);
2775 EXPORT_SYMBOL_GPL(md_rdev_init
);
2777 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2779 * mark the device faulty if:
2781 * - the device is nonexistent (zero size)
2782 * - the device has no valid superblock
2784 * a faulty rdev _never_ has rdev->sb set.
2786 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2788 char b
[BDEVNAME_SIZE
];
2793 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2795 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2796 return ERR_PTR(-ENOMEM
);
2800 if ((err
= alloc_disk_sb(rdev
)))
2803 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2807 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2809 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
2812 "md: %s has zero or unknown size, marking faulty!\n",
2813 bdevname(rdev
->bdev
,b
));
2818 if (super_format
>= 0) {
2819 err
= super_types
[super_format
].
2820 load_super(rdev
, NULL
, super_minor
);
2821 if (err
== -EINVAL
) {
2823 "md: %s does not have a valid v%d.%d "
2824 "superblock, not importing!\n",
2825 bdevname(rdev
->bdev
,b
),
2826 super_format
, super_minor
);
2831 "md: could not read %s's sb, not importing!\n",
2832 bdevname(rdev
->bdev
,b
));
2840 if (rdev
->sb_page
) {
2846 return ERR_PTR(err
);
2850 * Check a full RAID array for plausibility
2854 static void analyze_sbs(mddev_t
* mddev
)
2857 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2858 char b
[BDEVNAME_SIZE
];
2861 rdev_for_each(rdev
, tmp
, mddev
)
2862 switch (super_types
[mddev
->major_version
].
2863 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2871 "md: fatal superblock inconsistency in %s"
2872 " -- removing from array\n",
2873 bdevname(rdev
->bdev
,b
));
2874 kick_rdev_from_array(rdev
);
2878 super_types
[mddev
->major_version
].
2879 validate_super(mddev
, freshest
);
2882 rdev_for_each(rdev
, tmp
, mddev
) {
2883 if (mddev
->max_disks
&&
2884 (rdev
->desc_nr
>= mddev
->max_disks
||
2885 i
> mddev
->max_disks
)) {
2887 "md: %s: %s: only %d devices permitted\n",
2888 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2890 kick_rdev_from_array(rdev
);
2893 if (rdev
!= freshest
)
2894 if (super_types
[mddev
->major_version
].
2895 validate_super(mddev
, rdev
)) {
2896 printk(KERN_WARNING
"md: kicking non-fresh %s"
2898 bdevname(rdev
->bdev
,b
));
2899 kick_rdev_from_array(rdev
);
2902 if (mddev
->level
== LEVEL_MULTIPATH
) {
2903 rdev
->desc_nr
= i
++;
2904 rdev
->raid_disk
= rdev
->desc_nr
;
2905 set_bit(In_sync
, &rdev
->flags
);
2906 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2907 rdev
->raid_disk
= -1;
2908 clear_bit(In_sync
, &rdev
->flags
);
2913 /* Read a fixed-point number.
2914 * Numbers in sysfs attributes should be in "standard" units where
2915 * possible, so time should be in seconds.
2916 * However we internally use a a much smaller unit such as
2917 * milliseconds or jiffies.
2918 * This function takes a decimal number with a possible fractional
2919 * component, and produces an integer which is the result of
2920 * multiplying that number by 10^'scale'.
2921 * all without any floating-point arithmetic.
2923 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2925 unsigned long result
= 0;
2927 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2930 else if (decimals
< scale
) {
2933 result
= result
* 10 + value
;
2945 while (decimals
< scale
) {
2954 static void md_safemode_timeout(unsigned long data
);
2957 safe_delay_show(mddev_t
*mddev
, char *page
)
2959 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2960 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2963 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2967 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2970 mddev
->safemode_delay
= 0;
2972 unsigned long old_delay
= mddev
->safemode_delay
;
2973 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2974 if (mddev
->safemode_delay
== 0)
2975 mddev
->safemode_delay
= 1;
2976 if (mddev
->safemode_delay
< old_delay
)
2977 md_safemode_timeout((unsigned long)mddev
);
2981 static struct md_sysfs_entry md_safe_delay
=
2982 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2985 level_show(mddev_t
*mddev
, char *page
)
2987 struct mdk_personality
*p
= mddev
->pers
;
2989 return sprintf(page
, "%s\n", p
->name
);
2990 else if (mddev
->clevel
[0])
2991 return sprintf(page
, "%s\n", mddev
->clevel
);
2992 else if (mddev
->level
!= LEVEL_NONE
)
2993 return sprintf(page
, "%d\n", mddev
->level
);
2999 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3003 struct mdk_personality
*pers
;
3008 if (mddev
->pers
== NULL
) {
3011 if (len
>= sizeof(mddev
->clevel
))
3013 strncpy(mddev
->clevel
, buf
, len
);
3014 if (mddev
->clevel
[len
-1] == '\n')
3016 mddev
->clevel
[len
] = 0;
3017 mddev
->level
= LEVEL_NONE
;
3021 /* request to change the personality. Need to ensure:
3022 * - array is not engaged in resync/recovery/reshape
3023 * - old personality can be suspended
3024 * - new personality will access other array.
3027 if (mddev
->sync_thread
||
3028 mddev
->reshape_position
!= MaxSector
||
3029 mddev
->sysfs_active
)
3032 if (!mddev
->pers
->quiesce
) {
3033 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3034 mdname(mddev
), mddev
->pers
->name
);
3038 /* Now find the new personality */
3039 if (len
== 0 || len
>= sizeof(clevel
))
3041 strncpy(clevel
, buf
, len
);
3042 if (clevel
[len
-1] == '\n')
3045 if (strict_strtol(clevel
, 10, &level
))
3048 if (request_module("md-%s", clevel
) != 0)
3049 request_module("md-level-%s", clevel
);
3050 spin_lock(&pers_lock
);
3051 pers
= find_pers(level
, clevel
);
3052 if (!pers
|| !try_module_get(pers
->owner
)) {
3053 spin_unlock(&pers_lock
);
3054 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3057 spin_unlock(&pers_lock
);
3059 if (pers
== mddev
->pers
) {
3060 /* Nothing to do! */
3061 module_put(pers
->owner
);
3064 if (!pers
->takeover
) {
3065 module_put(pers
->owner
);
3066 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3067 mdname(mddev
), clevel
);
3071 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3072 rdev
->new_raid_disk
= rdev
->raid_disk
;
3074 /* ->takeover must set new_* and/or delta_disks
3075 * if it succeeds, and may set them when it fails.
3077 priv
= pers
->takeover(mddev
);
3079 mddev
->new_level
= mddev
->level
;
3080 mddev
->new_layout
= mddev
->layout
;
3081 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3082 mddev
->raid_disks
-= mddev
->delta_disks
;
3083 mddev
->delta_disks
= 0;
3084 module_put(pers
->owner
);
3085 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3086 mdname(mddev
), clevel
);
3087 return PTR_ERR(priv
);
3090 /* Looks like we have a winner */
3091 mddev_suspend(mddev
);
3092 mddev
->pers
->stop(mddev
);
3094 if (mddev
->pers
->sync_request
== NULL
&&
3095 pers
->sync_request
!= NULL
) {
3096 /* need to add the md_redundancy_group */
3097 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3099 "md: cannot register extra attributes for %s\n",
3101 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3103 if (mddev
->pers
->sync_request
!= NULL
&&
3104 pers
->sync_request
== NULL
) {
3105 /* need to remove the md_redundancy_group */
3106 if (mddev
->to_remove
== NULL
)
3107 mddev
->to_remove
= &md_redundancy_group
;
3110 if (mddev
->pers
->sync_request
== NULL
&&
3112 /* We are converting from a no-redundancy array
3113 * to a redundancy array and metadata is managed
3114 * externally so we need to be sure that writes
3115 * won't block due to a need to transition
3117 * until external management is started.
3120 mddev
->safemode_delay
= 0;
3121 mddev
->safemode
= 0;
3124 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3126 if (rdev
->raid_disk
< 0)
3128 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3129 rdev
->new_raid_disk
= -1;
3130 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3132 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3133 sysfs_remove_link(&mddev
->kobj
, nm
);
3135 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3136 if (rdev
->raid_disk
< 0)
3138 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3140 rdev
->raid_disk
= rdev
->new_raid_disk
;
3141 if (rdev
->raid_disk
< 0)
3142 clear_bit(In_sync
, &rdev
->flags
);
3145 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3146 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3147 printk("md: cannot register %s for %s after level change\n",
3152 module_put(mddev
->pers
->owner
);
3154 mddev
->private = priv
;
3155 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3156 mddev
->level
= mddev
->new_level
;
3157 mddev
->layout
= mddev
->new_layout
;
3158 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3159 mddev
->delta_disks
= 0;
3160 if (mddev
->pers
->sync_request
== NULL
) {
3161 /* this is now an array without redundancy, so
3162 * it must always be in_sync
3165 del_timer_sync(&mddev
->safemode_timer
);
3168 mddev_resume(mddev
);
3169 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3170 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3171 md_wakeup_thread(mddev
->thread
);
3172 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3173 md_new_event(mddev
);
3177 static struct md_sysfs_entry md_level
=
3178 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3182 layout_show(mddev_t
*mddev
, char *page
)
3184 /* just a number, not meaningful for all levels */
3185 if (mddev
->reshape_position
!= MaxSector
&&
3186 mddev
->layout
!= mddev
->new_layout
)
3187 return sprintf(page
, "%d (%d)\n",
3188 mddev
->new_layout
, mddev
->layout
);
3189 return sprintf(page
, "%d\n", mddev
->layout
);
3193 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3196 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3198 if (!*buf
|| (*e
&& *e
!= '\n'))
3203 if (mddev
->pers
->check_reshape
== NULL
)
3205 mddev
->new_layout
= n
;
3206 err
= mddev
->pers
->check_reshape(mddev
);
3208 mddev
->new_layout
= mddev
->layout
;
3212 mddev
->new_layout
= n
;
3213 if (mddev
->reshape_position
== MaxSector
)
3218 static struct md_sysfs_entry md_layout
=
3219 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3223 raid_disks_show(mddev_t
*mddev
, char *page
)
3225 if (mddev
->raid_disks
== 0)
3227 if (mddev
->reshape_position
!= MaxSector
&&
3228 mddev
->delta_disks
!= 0)
3229 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3230 mddev
->raid_disks
- mddev
->delta_disks
);
3231 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3234 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3237 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3241 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3243 if (!*buf
|| (*e
&& *e
!= '\n'))
3247 rv
= update_raid_disks(mddev
, n
);
3248 else if (mddev
->reshape_position
!= MaxSector
) {
3249 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3250 mddev
->delta_disks
= n
- olddisks
;
3251 mddev
->raid_disks
= n
;
3253 mddev
->raid_disks
= n
;
3254 return rv
? rv
: len
;
3256 static struct md_sysfs_entry md_raid_disks
=
3257 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3260 chunk_size_show(mddev_t
*mddev
, char *page
)
3262 if (mddev
->reshape_position
!= MaxSector
&&
3263 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3264 return sprintf(page
, "%d (%d)\n",
3265 mddev
->new_chunk_sectors
<< 9,
3266 mddev
->chunk_sectors
<< 9);
3267 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3271 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3274 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3276 if (!*buf
|| (*e
&& *e
!= '\n'))
3281 if (mddev
->pers
->check_reshape
== NULL
)
3283 mddev
->new_chunk_sectors
= n
>> 9;
3284 err
= mddev
->pers
->check_reshape(mddev
);
3286 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3290 mddev
->new_chunk_sectors
= n
>> 9;
3291 if (mddev
->reshape_position
== MaxSector
)
3292 mddev
->chunk_sectors
= n
>> 9;
3296 static struct md_sysfs_entry md_chunk_size
=
3297 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3300 resync_start_show(mddev_t
*mddev
, char *page
)
3302 if (mddev
->recovery_cp
== MaxSector
)
3303 return sprintf(page
, "none\n");
3304 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3308 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3311 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3315 if (cmd_match(buf
, "none"))
3317 else if (!*buf
|| (*e
&& *e
!= '\n'))
3320 mddev
->recovery_cp
= n
;
3323 static struct md_sysfs_entry md_resync_start
=
3324 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3327 * The array state can be:
3330 * No devices, no size, no level
3331 * Equivalent to STOP_ARRAY ioctl
3333 * May have some settings, but array is not active
3334 * all IO results in error
3335 * When written, doesn't tear down array, but just stops it
3336 * suspended (not supported yet)
3337 * All IO requests will block. The array can be reconfigured.
3338 * Writing this, if accepted, will block until array is quiescent
3340 * no resync can happen. no superblocks get written.
3341 * write requests fail
3343 * like readonly, but behaves like 'clean' on a write request.
3345 * clean - no pending writes, but otherwise active.
3346 * When written to inactive array, starts without resync
3347 * If a write request arrives then
3348 * if metadata is known, mark 'dirty' and switch to 'active'.
3349 * if not known, block and switch to write-pending
3350 * If written to an active array that has pending writes, then fails.
3352 * fully active: IO and resync can be happening.
3353 * When written to inactive array, starts with resync
3356 * clean, but writes are blocked waiting for 'active' to be written.
3359 * like active, but no writes have been seen for a while (100msec).
3362 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3363 write_pending
, active_idle
, bad_word
};
3364 static char *array_states
[] = {
3365 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3366 "write-pending", "active-idle", NULL
};
3368 static int match_word(const char *word
, char **list
)
3371 for (n
=0; list
[n
]; n
++)
3372 if (cmd_match(word
, list
[n
]))
3378 array_state_show(mddev_t
*mddev
, char *page
)
3380 enum array_state st
= inactive
;
3393 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3395 else if (mddev
->safemode
)
3401 if (list_empty(&mddev
->disks
) &&
3402 mddev
->raid_disks
== 0 &&
3403 mddev
->dev_sectors
== 0)
3408 return sprintf(page
, "%s\n", array_states
[st
]);
3411 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3412 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3413 static int do_md_run(mddev_t
* mddev
);
3414 static int restart_array(mddev_t
*mddev
);
3417 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3420 enum array_state st
= match_word(buf
, array_states
);
3425 /* stopping an active array */
3426 if (atomic_read(&mddev
->openers
) > 0)
3428 err
= do_md_stop(mddev
, 0, 0);
3431 /* stopping an active array */
3433 if (atomic_read(&mddev
->openers
) > 0)
3435 err
= do_md_stop(mddev
, 2, 0);
3437 err
= 0; /* already inactive */
3440 break; /* not supported yet */
3443 err
= md_set_readonly(mddev
, 0);
3446 set_disk_ro(mddev
->gendisk
, 1);
3447 err
= do_md_run(mddev
);
3453 err
= md_set_readonly(mddev
, 0);
3454 else if (mddev
->ro
== 1)
3455 err
= restart_array(mddev
);
3458 set_disk_ro(mddev
->gendisk
, 0);
3462 err
= do_md_run(mddev
);
3467 restart_array(mddev
);
3468 spin_lock_irq(&mddev
->write_lock
);
3469 if (atomic_read(&mddev
->writes_pending
) == 0) {
3470 if (mddev
->in_sync
== 0) {
3472 if (mddev
->safemode
== 1)
3473 mddev
->safemode
= 0;
3474 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3479 spin_unlock_irq(&mddev
->write_lock
);
3485 restart_array(mddev
);
3486 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3487 wake_up(&mddev
->sb_wait
);
3491 set_disk_ro(mddev
->gendisk
, 0);
3492 err
= do_md_run(mddev
);
3497 /* these cannot be set */
3503 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3507 static struct md_sysfs_entry md_array_state
=
3508 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3511 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3512 return sprintf(page
, "%d\n",
3513 atomic_read(&mddev
->max_corr_read_errors
));
3517 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3520 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3522 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3523 atomic_set(&mddev
->max_corr_read_errors
, n
);
3529 static struct md_sysfs_entry max_corr_read_errors
=
3530 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3531 max_corrected_read_errors_store
);
3534 null_show(mddev_t
*mddev
, char *page
)
3540 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3542 /* buf must be %d:%d\n? giving major and minor numbers */
3543 /* The new device is added to the array.
3544 * If the array has a persistent superblock, we read the
3545 * superblock to initialise info and check validity.
3546 * Otherwise, only checking done is that in bind_rdev_to_array,
3547 * which mainly checks size.
3550 int major
= simple_strtoul(buf
, &e
, 10);
3556 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3558 minor
= simple_strtoul(e
+1, &e
, 10);
3559 if (*e
&& *e
!= '\n')
3561 dev
= MKDEV(major
, minor
);
3562 if (major
!= MAJOR(dev
) ||
3563 minor
!= MINOR(dev
))
3567 if (mddev
->persistent
) {
3568 rdev
= md_import_device(dev
, mddev
->major_version
,
3569 mddev
->minor_version
);
3570 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3571 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3572 mdk_rdev_t
, same_set
);
3573 err
= super_types
[mddev
->major_version
]
3574 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3578 } else if (mddev
->external
)
3579 rdev
= md_import_device(dev
, -2, -1);
3581 rdev
= md_import_device(dev
, -1, -1);
3584 return PTR_ERR(rdev
);
3585 err
= bind_rdev_to_array(rdev
, mddev
);
3589 return err
? err
: len
;
3592 static struct md_sysfs_entry md_new_device
=
3593 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3596 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3599 unsigned long chunk
, end_chunk
;
3603 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3605 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3606 if (buf
== end
) break;
3607 if (*end
== '-') { /* range */
3609 end_chunk
= simple_strtoul(buf
, &end
, 0);
3610 if (buf
== end
) break;
3612 if (*end
&& !isspace(*end
)) break;
3613 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3614 buf
= skip_spaces(end
);
3616 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3621 static struct md_sysfs_entry md_bitmap
=
3622 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3625 size_show(mddev_t
*mddev
, char *page
)
3627 return sprintf(page
, "%llu\n",
3628 (unsigned long long)mddev
->dev_sectors
/ 2);
3631 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3634 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3636 /* If array is inactive, we can reduce the component size, but
3637 * not increase it (except from 0).
3638 * If array is active, we can try an on-line resize
3641 int err
= strict_blocks_to_sectors(buf
, §ors
);
3646 err
= update_size(mddev
, sectors
);
3647 md_update_sb(mddev
, 1);
3649 if (mddev
->dev_sectors
== 0 ||
3650 mddev
->dev_sectors
> sectors
)
3651 mddev
->dev_sectors
= sectors
;
3655 return err
? err
: len
;
3658 static struct md_sysfs_entry md_size
=
3659 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3664 * 'none' for arrays with no metadata (good luck...)
3665 * 'external' for arrays with externally managed metadata,
3666 * or N.M for internally known formats
3669 metadata_show(mddev_t
*mddev
, char *page
)
3671 if (mddev
->persistent
)
3672 return sprintf(page
, "%d.%d\n",
3673 mddev
->major_version
, mddev
->minor_version
);
3674 else if (mddev
->external
)
3675 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3677 return sprintf(page
, "none\n");
3681 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3685 /* Changing the details of 'external' metadata is
3686 * always permitted. Otherwise there must be
3687 * no devices attached to the array.
3689 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3691 else if (!list_empty(&mddev
->disks
))
3694 if (cmd_match(buf
, "none")) {
3695 mddev
->persistent
= 0;
3696 mddev
->external
= 0;
3697 mddev
->major_version
= 0;
3698 mddev
->minor_version
= 90;
3701 if (strncmp(buf
, "external:", 9) == 0) {
3702 size_t namelen
= len
-9;
3703 if (namelen
>= sizeof(mddev
->metadata_type
))
3704 namelen
= sizeof(mddev
->metadata_type
)-1;
3705 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3706 mddev
->metadata_type
[namelen
] = 0;
3707 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3708 mddev
->metadata_type
[--namelen
] = 0;
3709 mddev
->persistent
= 0;
3710 mddev
->external
= 1;
3711 mddev
->major_version
= 0;
3712 mddev
->minor_version
= 90;
3715 major
= simple_strtoul(buf
, &e
, 10);
3716 if (e
==buf
|| *e
!= '.')
3719 minor
= simple_strtoul(buf
, &e
, 10);
3720 if (e
==buf
|| (*e
&& *e
!= '\n') )
3722 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3724 mddev
->major_version
= major
;
3725 mddev
->minor_version
= minor
;
3726 mddev
->persistent
= 1;
3727 mddev
->external
= 0;
3731 static struct md_sysfs_entry md_metadata
=
3732 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3735 action_show(mddev_t
*mddev
, char *page
)
3737 char *type
= "idle";
3738 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3740 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3741 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3742 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3744 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3745 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3747 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3751 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3754 return sprintf(page
, "%s\n", type
);
3758 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3760 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3763 if (cmd_match(page
, "frozen"))
3764 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3766 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3768 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3769 if (mddev
->sync_thread
) {
3770 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3771 md_unregister_thread(mddev
->sync_thread
);
3772 mddev
->sync_thread
= NULL
;
3773 mddev
->recovery
= 0;
3775 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3776 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3778 else if (cmd_match(page
, "resync"))
3779 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3780 else if (cmd_match(page
, "recover")) {
3781 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3782 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3783 } else if (cmd_match(page
, "reshape")) {
3785 if (mddev
->pers
->start_reshape
== NULL
)
3787 err
= mddev
->pers
->start_reshape(mddev
);
3790 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3792 if (cmd_match(page
, "check"))
3793 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3794 else if (!cmd_match(page
, "repair"))
3796 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3797 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3799 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3800 md_wakeup_thread(mddev
->thread
);
3801 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3806 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3808 return sprintf(page
, "%llu\n",
3809 (unsigned long long) mddev
->resync_mismatches
);
3812 static struct md_sysfs_entry md_scan_mode
=
3813 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3816 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3819 sync_min_show(mddev_t
*mddev
, char *page
)
3821 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3822 mddev
->sync_speed_min
? "local": "system");
3826 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3830 if (strncmp(buf
, "system", 6)==0) {
3831 mddev
->sync_speed_min
= 0;
3834 min
= simple_strtoul(buf
, &e
, 10);
3835 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3837 mddev
->sync_speed_min
= min
;
3841 static struct md_sysfs_entry md_sync_min
=
3842 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3845 sync_max_show(mddev_t
*mddev
, char *page
)
3847 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3848 mddev
->sync_speed_max
? "local": "system");
3852 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3856 if (strncmp(buf
, "system", 6)==0) {
3857 mddev
->sync_speed_max
= 0;
3860 max
= simple_strtoul(buf
, &e
, 10);
3861 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3863 mddev
->sync_speed_max
= max
;
3867 static struct md_sysfs_entry md_sync_max
=
3868 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3871 degraded_show(mddev_t
*mddev
, char *page
)
3873 return sprintf(page
, "%d\n", mddev
->degraded
);
3875 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3878 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3880 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3884 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3888 if (strict_strtol(buf
, 10, &n
))
3891 if (n
!= 0 && n
!= 1)
3894 mddev
->parallel_resync
= n
;
3896 if (mddev
->sync_thread
)
3897 wake_up(&resync_wait
);
3902 /* force parallel resync, even with shared block devices */
3903 static struct md_sysfs_entry md_sync_force_parallel
=
3904 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3905 sync_force_parallel_show
, sync_force_parallel_store
);
3908 sync_speed_show(mddev_t
*mddev
, char *page
)
3910 unsigned long resync
, dt
, db
;
3911 if (mddev
->curr_resync
== 0)
3912 return sprintf(page
, "none\n");
3913 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3914 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3916 db
= resync
- mddev
->resync_mark_cnt
;
3917 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3920 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3923 sync_completed_show(mddev_t
*mddev
, char *page
)
3925 unsigned long max_sectors
, resync
;
3927 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3928 return sprintf(page
, "none\n");
3930 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3931 max_sectors
= mddev
->resync_max_sectors
;
3933 max_sectors
= mddev
->dev_sectors
;
3935 resync
= mddev
->curr_resync_completed
;
3936 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3939 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3942 min_sync_show(mddev_t
*mddev
, char *page
)
3944 return sprintf(page
, "%llu\n",
3945 (unsigned long long)mddev
->resync_min
);
3948 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3950 unsigned long long min
;
3951 if (strict_strtoull(buf
, 10, &min
))
3953 if (min
> mddev
->resync_max
)
3955 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3958 /* Must be a multiple of chunk_size */
3959 if (mddev
->chunk_sectors
) {
3960 sector_t temp
= min
;
3961 if (sector_div(temp
, mddev
->chunk_sectors
))
3964 mddev
->resync_min
= min
;
3969 static struct md_sysfs_entry md_min_sync
=
3970 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3973 max_sync_show(mddev_t
*mddev
, char *page
)
3975 if (mddev
->resync_max
== MaxSector
)
3976 return sprintf(page
, "max\n");
3978 return sprintf(page
, "%llu\n",
3979 (unsigned long long)mddev
->resync_max
);
3982 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3984 if (strncmp(buf
, "max", 3) == 0)
3985 mddev
->resync_max
= MaxSector
;
3987 unsigned long long max
;
3988 if (strict_strtoull(buf
, 10, &max
))
3990 if (max
< mddev
->resync_min
)
3992 if (max
< mddev
->resync_max
&&
3994 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3997 /* Must be a multiple of chunk_size */
3998 if (mddev
->chunk_sectors
) {
3999 sector_t temp
= max
;
4000 if (sector_div(temp
, mddev
->chunk_sectors
))
4003 mddev
->resync_max
= max
;
4005 wake_up(&mddev
->recovery_wait
);
4009 static struct md_sysfs_entry md_max_sync
=
4010 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4013 suspend_lo_show(mddev_t
*mddev
, char *page
)
4015 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4019 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4022 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4024 if (mddev
->pers
== NULL
||
4025 mddev
->pers
->quiesce
== NULL
)
4027 if (buf
== e
|| (*e
&& *e
!= '\n'))
4029 if (new >= mddev
->suspend_hi
||
4030 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
4031 mddev
->suspend_lo
= new;
4032 mddev
->pers
->quiesce(mddev
, 2);
4037 static struct md_sysfs_entry md_suspend_lo
=
4038 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4042 suspend_hi_show(mddev_t
*mddev
, char *page
)
4044 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4048 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4051 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4053 if (mddev
->pers
== NULL
||
4054 mddev
->pers
->quiesce
== NULL
)
4056 if (buf
== e
|| (*e
&& *e
!= '\n'))
4058 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
4059 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
4060 mddev
->suspend_hi
= new;
4061 mddev
->pers
->quiesce(mddev
, 1);
4062 mddev
->pers
->quiesce(mddev
, 0);
4067 static struct md_sysfs_entry md_suspend_hi
=
4068 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4071 reshape_position_show(mddev_t
*mddev
, char *page
)
4073 if (mddev
->reshape_position
!= MaxSector
)
4074 return sprintf(page
, "%llu\n",
4075 (unsigned long long)mddev
->reshape_position
);
4076 strcpy(page
, "none\n");
4081 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4084 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4087 if (buf
== e
|| (*e
&& *e
!= '\n'))
4089 mddev
->reshape_position
= new;
4090 mddev
->delta_disks
= 0;
4091 mddev
->new_level
= mddev
->level
;
4092 mddev
->new_layout
= mddev
->layout
;
4093 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4097 static struct md_sysfs_entry md_reshape_position
=
4098 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4099 reshape_position_store
);
4102 array_size_show(mddev_t
*mddev
, char *page
)
4104 if (mddev
->external_size
)
4105 return sprintf(page
, "%llu\n",
4106 (unsigned long long)mddev
->array_sectors
/2);
4108 return sprintf(page
, "default\n");
4112 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4116 if (strncmp(buf
, "default", 7) == 0) {
4118 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4120 sectors
= mddev
->array_sectors
;
4122 mddev
->external_size
= 0;
4124 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4126 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4129 mddev
->external_size
= 1;
4132 mddev
->array_sectors
= sectors
;
4133 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4135 revalidate_disk(mddev
->gendisk
);
4140 static struct md_sysfs_entry md_array_size
=
4141 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4144 static struct attribute
*md_default_attrs
[] = {
4147 &md_raid_disks
.attr
,
4148 &md_chunk_size
.attr
,
4150 &md_resync_start
.attr
,
4152 &md_new_device
.attr
,
4153 &md_safe_delay
.attr
,
4154 &md_array_state
.attr
,
4155 &md_reshape_position
.attr
,
4156 &md_array_size
.attr
,
4157 &max_corr_read_errors
.attr
,
4161 static struct attribute
*md_redundancy_attrs
[] = {
4163 &md_mismatches
.attr
,
4166 &md_sync_speed
.attr
,
4167 &md_sync_force_parallel
.attr
,
4168 &md_sync_completed
.attr
,
4171 &md_suspend_lo
.attr
,
4172 &md_suspend_hi
.attr
,
4177 static struct attribute_group md_redundancy_group
= {
4179 .attrs
= md_redundancy_attrs
,
4184 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4186 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4187 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4192 rv
= mddev_lock(mddev
);
4194 rv
= entry
->show(mddev
, page
);
4195 mddev_unlock(mddev
);
4201 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4202 const char *page
, size_t length
)
4204 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4205 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4210 if (!capable(CAP_SYS_ADMIN
))
4212 rv
= mddev_lock(mddev
);
4213 if (mddev
->hold_active
== UNTIL_IOCTL
)
4214 mddev
->hold_active
= 0;
4216 rv
= entry
->store(mddev
, page
, length
);
4217 mddev_unlock(mddev
);
4222 static void md_free(struct kobject
*ko
)
4224 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4226 if (mddev
->sysfs_state
)
4227 sysfs_put(mddev
->sysfs_state
);
4229 if (mddev
->gendisk
) {
4230 del_gendisk(mddev
->gendisk
);
4231 put_disk(mddev
->gendisk
);
4234 blk_cleanup_queue(mddev
->queue
);
4239 static const struct sysfs_ops md_sysfs_ops
= {
4240 .show
= md_attr_show
,
4241 .store
= md_attr_store
,
4243 static struct kobj_type md_ktype
= {
4245 .sysfs_ops
= &md_sysfs_ops
,
4246 .default_attrs
= md_default_attrs
,
4251 static void mddev_delayed_delete(struct work_struct
*ws
)
4253 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4255 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4256 kobject_del(&mddev
->kobj
);
4257 kobject_put(&mddev
->kobj
);
4260 static int md_alloc(dev_t dev
, char *name
)
4262 static DEFINE_MUTEX(disks_mutex
);
4263 mddev_t
*mddev
= mddev_find(dev
);
4264 struct gendisk
*disk
;
4273 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4274 shift
= partitioned
? MdpMinorShift
: 0;
4275 unit
= MINOR(mddev
->unit
) >> shift
;
4277 /* wait for any previous instance of this device to be
4278 * completely removed (mddev_delayed_delete).
4280 flush_workqueue(md_misc_wq
);
4282 mutex_lock(&disks_mutex
);
4288 /* Need to ensure that 'name' is not a duplicate.
4291 spin_lock(&all_mddevs_lock
);
4293 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4294 if (mddev2
->gendisk
&&
4295 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4296 spin_unlock(&all_mddevs_lock
);
4299 spin_unlock(&all_mddevs_lock
);
4303 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4306 mddev
->queue
->queuedata
= mddev
;
4308 blk_queue_make_request(mddev
->queue
, md_make_request
);
4310 disk
= alloc_disk(1 << shift
);
4312 blk_cleanup_queue(mddev
->queue
);
4313 mddev
->queue
= NULL
;
4316 disk
->major
= MAJOR(mddev
->unit
);
4317 disk
->first_minor
= unit
<< shift
;
4319 strcpy(disk
->disk_name
, name
);
4320 else if (partitioned
)
4321 sprintf(disk
->disk_name
, "md_d%d", unit
);
4323 sprintf(disk
->disk_name
, "md%d", unit
);
4324 disk
->fops
= &md_fops
;
4325 disk
->private_data
= mddev
;
4326 disk
->queue
= mddev
->queue
;
4327 /* Allow extended partitions. This makes the
4328 * 'mdp' device redundant, but we can't really
4331 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4333 mddev
->gendisk
= disk
;
4334 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4335 &disk_to_dev(disk
)->kobj
, "%s", "md");
4337 /* This isn't possible, but as kobject_init_and_add is marked
4338 * __must_check, we must do something with the result
4340 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4344 if (mddev
->kobj
.sd
&&
4345 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4346 printk(KERN_DEBUG
"pointless warning\n");
4348 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4350 mutex_unlock(&disks_mutex
);
4351 if (!error
&& mddev
->kobj
.sd
) {
4352 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4353 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4359 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4361 md_alloc(dev
, NULL
);
4365 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4367 /* val must be "md_*" where * is not all digits.
4368 * We allocate an array with a large free minor number, and
4369 * set the name to val. val must not already be an active name.
4371 int len
= strlen(val
);
4372 char buf
[DISK_NAME_LEN
];
4374 while (len
&& val
[len
-1] == '\n')
4376 if (len
>= DISK_NAME_LEN
)
4378 strlcpy(buf
, val
, len
+1);
4379 if (strncmp(buf
, "md_", 3) != 0)
4381 return md_alloc(0, buf
);
4384 static void md_safemode_timeout(unsigned long data
)
4386 mddev_t
*mddev
= (mddev_t
*) data
;
4388 if (!atomic_read(&mddev
->writes_pending
)) {
4389 mddev
->safemode
= 1;
4390 if (mddev
->external
)
4391 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4393 md_wakeup_thread(mddev
->thread
);
4396 static int start_dirty_degraded
;
4398 int md_run(mddev_t
*mddev
)
4402 struct mdk_personality
*pers
;
4404 if (list_empty(&mddev
->disks
))
4405 /* cannot run an array with no devices.. */
4410 /* Cannot run until previous stop completes properly */
4411 if (mddev
->sysfs_active
)
4415 * Analyze all RAID superblock(s)
4417 if (!mddev
->raid_disks
) {
4418 if (!mddev
->persistent
)
4423 if (mddev
->level
!= LEVEL_NONE
)
4424 request_module("md-level-%d", mddev
->level
);
4425 else if (mddev
->clevel
[0])
4426 request_module("md-%s", mddev
->clevel
);
4429 * Drop all container device buffers, from now on
4430 * the only valid external interface is through the md
4433 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4434 if (test_bit(Faulty
, &rdev
->flags
))
4436 sync_blockdev(rdev
->bdev
);
4437 invalidate_bdev(rdev
->bdev
);
4439 /* perform some consistency tests on the device.
4440 * We don't want the data to overlap the metadata,
4441 * Internal Bitmap issues have been handled elsewhere.
4443 if (rdev
->data_offset
< rdev
->sb_start
) {
4444 if (mddev
->dev_sectors
&&
4445 rdev
->data_offset
+ mddev
->dev_sectors
4447 printk("md: %s: data overlaps metadata\n",
4452 if (rdev
->sb_start
+ rdev
->sb_size
/512
4453 > rdev
->data_offset
) {
4454 printk("md: %s: metadata overlaps data\n",
4459 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4462 if (mddev
->bio_set
== NULL
)
4463 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, sizeof(mddev
));
4465 spin_lock(&pers_lock
);
4466 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4467 if (!pers
|| !try_module_get(pers
->owner
)) {
4468 spin_unlock(&pers_lock
);
4469 if (mddev
->level
!= LEVEL_NONE
)
4470 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4473 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4478 spin_unlock(&pers_lock
);
4479 if (mddev
->level
!= pers
->level
) {
4480 mddev
->level
= pers
->level
;
4481 mddev
->new_level
= pers
->level
;
4483 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4485 if (mddev
->reshape_position
!= MaxSector
&&
4486 pers
->start_reshape
== NULL
) {
4487 /* This personality cannot handle reshaping... */
4489 module_put(pers
->owner
);
4493 if (pers
->sync_request
) {
4494 /* Warn if this is a potentially silly
4497 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4501 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4502 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4504 rdev
->bdev
->bd_contains
==
4505 rdev2
->bdev
->bd_contains
) {
4507 "%s: WARNING: %s appears to be"
4508 " on the same physical disk as"
4511 bdevname(rdev
->bdev
,b
),
4512 bdevname(rdev2
->bdev
,b2
));
4519 "True protection against single-disk"
4520 " failure might be compromised.\n");
4523 mddev
->recovery
= 0;
4524 /* may be over-ridden by personality */
4525 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4527 mddev
->ok_start_degraded
= start_dirty_degraded
;
4529 if (start_readonly
&& mddev
->ro
== 0)
4530 mddev
->ro
= 2; /* read-only, but switch on first write */
4532 err
= mddev
->pers
->run(mddev
);
4534 printk(KERN_ERR
"md: pers->run() failed ...\n");
4535 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4536 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4537 " but 'external_size' not in effect?\n", __func__
);
4539 "md: invalid array_size %llu > default size %llu\n",
4540 (unsigned long long)mddev
->array_sectors
/ 2,
4541 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4543 mddev
->pers
->stop(mddev
);
4545 if (err
== 0 && mddev
->pers
->sync_request
) {
4546 err
= bitmap_create(mddev
);
4548 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4549 mdname(mddev
), err
);
4550 mddev
->pers
->stop(mddev
);
4554 module_put(mddev
->pers
->owner
);
4556 bitmap_destroy(mddev
);
4559 if (mddev
->pers
->sync_request
) {
4560 if (mddev
->kobj
.sd
&&
4561 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4563 "md: cannot register extra attributes for %s\n",
4565 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4566 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4569 atomic_set(&mddev
->writes_pending
,0);
4570 atomic_set(&mddev
->max_corr_read_errors
,
4571 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4572 mddev
->safemode
= 0;
4573 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4574 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4575 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4579 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4580 if (rdev
->raid_disk
>= 0) {
4582 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4583 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4584 /* failure here is OK */;
4587 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4590 md_update_sb(mddev
, 0);
4592 md_wakeup_thread(mddev
->thread
);
4593 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4595 md_new_event(mddev
);
4596 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4597 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4598 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4601 EXPORT_SYMBOL_GPL(md_run
);
4603 static int do_md_run(mddev_t
*mddev
)
4607 err
= md_run(mddev
);
4610 err
= bitmap_load(mddev
);
4612 bitmap_destroy(mddev
);
4615 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4616 revalidate_disk(mddev
->gendisk
);
4618 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4623 static int restart_array(mddev_t
*mddev
)
4625 struct gendisk
*disk
= mddev
->gendisk
;
4627 /* Complain if it has no devices */
4628 if (list_empty(&mddev
->disks
))
4634 mddev
->safemode
= 0;
4636 set_disk_ro(disk
, 0);
4637 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4639 /* Kick recovery or resync if necessary */
4640 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4641 md_wakeup_thread(mddev
->thread
);
4642 md_wakeup_thread(mddev
->sync_thread
);
4643 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4647 /* similar to deny_write_access, but accounts for our holding a reference
4648 * to the file ourselves */
4649 static int deny_bitmap_write_access(struct file
* file
)
4651 struct inode
*inode
= file
->f_mapping
->host
;
4653 spin_lock(&inode
->i_lock
);
4654 if (atomic_read(&inode
->i_writecount
) > 1) {
4655 spin_unlock(&inode
->i_lock
);
4658 atomic_set(&inode
->i_writecount
, -1);
4659 spin_unlock(&inode
->i_lock
);
4664 void restore_bitmap_write_access(struct file
*file
)
4666 struct inode
*inode
= file
->f_mapping
->host
;
4668 spin_lock(&inode
->i_lock
);
4669 atomic_set(&inode
->i_writecount
, 1);
4670 spin_unlock(&inode
->i_lock
);
4673 static void md_clean(mddev_t
*mddev
)
4675 mddev
->array_sectors
= 0;
4676 mddev
->external_size
= 0;
4677 mddev
->dev_sectors
= 0;
4678 mddev
->raid_disks
= 0;
4679 mddev
->recovery_cp
= 0;
4680 mddev
->resync_min
= 0;
4681 mddev
->resync_max
= MaxSector
;
4682 mddev
->reshape_position
= MaxSector
;
4683 mddev
->external
= 0;
4684 mddev
->persistent
= 0;
4685 mddev
->level
= LEVEL_NONE
;
4686 mddev
->clevel
[0] = 0;
4689 mddev
->metadata_type
[0] = 0;
4690 mddev
->chunk_sectors
= 0;
4691 mddev
->ctime
= mddev
->utime
= 0;
4693 mddev
->max_disks
= 0;
4695 mddev
->can_decrease_events
= 0;
4696 mddev
->delta_disks
= 0;
4697 mddev
->new_level
= LEVEL_NONE
;
4698 mddev
->new_layout
= 0;
4699 mddev
->new_chunk_sectors
= 0;
4700 mddev
->curr_resync
= 0;
4701 mddev
->resync_mismatches
= 0;
4702 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4703 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4704 mddev
->recovery
= 0;
4707 mddev
->degraded
= 0;
4708 mddev
->safemode
= 0;
4709 mddev
->bitmap_info
.offset
= 0;
4710 mddev
->bitmap_info
.default_offset
= 0;
4711 mddev
->bitmap_info
.chunksize
= 0;
4712 mddev
->bitmap_info
.daemon_sleep
= 0;
4713 mddev
->bitmap_info
.max_write_behind
= 0;
4717 void md_stop_writes(mddev_t
*mddev
)
4719 if (mddev
->sync_thread
) {
4720 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4721 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4722 md_unregister_thread(mddev
->sync_thread
);
4723 mddev
->sync_thread
= NULL
;
4726 del_timer_sync(&mddev
->safemode_timer
);
4728 bitmap_flush(mddev
);
4729 md_super_wait(mddev
);
4731 if (!mddev
->in_sync
|| mddev
->flags
) {
4732 /* mark array as shutdown cleanly */
4734 md_update_sb(mddev
, 1);
4737 EXPORT_SYMBOL_GPL(md_stop_writes
);
4739 void md_stop(mddev_t
*mddev
)
4742 mddev
->pers
->stop(mddev
);
4743 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4744 mddev
->to_remove
= &md_redundancy_group
;
4745 module_put(mddev
->pers
->owner
);
4747 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4749 EXPORT_SYMBOL_GPL(md_stop
);
4751 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4754 mutex_lock(&mddev
->open_mutex
);
4755 if (atomic_read(&mddev
->openers
) > is_open
) {
4756 printk("md: %s still in use.\n",mdname(mddev
));
4761 md_stop_writes(mddev
);
4767 set_disk_ro(mddev
->gendisk
, 1);
4768 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4769 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4773 mutex_unlock(&mddev
->open_mutex
);
4778 * 0 - completely stop and dis-assemble array
4779 * 2 - stop but do not disassemble array
4781 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4783 struct gendisk
*disk
= mddev
->gendisk
;
4786 mutex_lock(&mddev
->open_mutex
);
4787 if (atomic_read(&mddev
->openers
) > is_open
||
4788 mddev
->sysfs_active
) {
4789 printk("md: %s still in use.\n",mdname(mddev
));
4790 mutex_unlock(&mddev
->open_mutex
);
4796 set_disk_ro(disk
, 0);
4798 md_stop_writes(mddev
);
4800 mddev
->queue
->merge_bvec_fn
= NULL
;
4801 mddev
->queue
->unplug_fn
= NULL
;
4802 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4804 /* tell userspace to handle 'inactive' */
4805 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4807 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4808 if (rdev
->raid_disk
>= 0) {
4810 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4811 sysfs_remove_link(&mddev
->kobj
, nm
);
4814 set_capacity(disk
, 0);
4815 mutex_unlock(&mddev
->open_mutex
);
4817 revalidate_disk(disk
);
4822 mutex_unlock(&mddev
->open_mutex
);
4824 * Free resources if final stop
4827 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4829 bitmap_destroy(mddev
);
4830 if (mddev
->bitmap_info
.file
) {
4831 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4832 fput(mddev
->bitmap_info
.file
);
4833 mddev
->bitmap_info
.file
= NULL
;
4835 mddev
->bitmap_info
.offset
= 0;
4837 export_array(mddev
);
4840 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4841 if (mddev
->hold_active
== UNTIL_STOP
)
4842 mddev
->hold_active
= 0;
4844 blk_integrity_unregister(disk
);
4845 md_new_event(mddev
);
4846 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4851 static void autorun_array(mddev_t
*mddev
)
4856 if (list_empty(&mddev
->disks
))
4859 printk(KERN_INFO
"md: running: ");
4861 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4862 char b
[BDEVNAME_SIZE
];
4863 printk("<%s>", bdevname(rdev
->bdev
,b
));
4867 err
= do_md_run(mddev
);
4869 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4870 do_md_stop(mddev
, 0, 0);
4875 * lets try to run arrays based on all disks that have arrived
4876 * until now. (those are in pending_raid_disks)
4878 * the method: pick the first pending disk, collect all disks with
4879 * the same UUID, remove all from the pending list and put them into
4880 * the 'same_array' list. Then order this list based on superblock
4881 * update time (freshest comes first), kick out 'old' disks and
4882 * compare superblocks. If everything's fine then run it.
4884 * If "unit" is allocated, then bump its reference count
4886 static void autorun_devices(int part
)
4888 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4890 char b
[BDEVNAME_SIZE
];
4892 printk(KERN_INFO
"md: autorun ...\n");
4893 while (!list_empty(&pending_raid_disks
)) {
4896 LIST_HEAD(candidates
);
4897 rdev0
= list_entry(pending_raid_disks
.next
,
4898 mdk_rdev_t
, same_set
);
4900 printk(KERN_INFO
"md: considering %s ...\n",
4901 bdevname(rdev0
->bdev
,b
));
4902 INIT_LIST_HEAD(&candidates
);
4903 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4904 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4905 printk(KERN_INFO
"md: adding %s ...\n",
4906 bdevname(rdev
->bdev
,b
));
4907 list_move(&rdev
->same_set
, &candidates
);
4910 * now we have a set of devices, with all of them having
4911 * mostly sane superblocks. It's time to allocate the
4915 dev
= MKDEV(mdp_major
,
4916 rdev0
->preferred_minor
<< MdpMinorShift
);
4917 unit
= MINOR(dev
) >> MdpMinorShift
;
4919 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4922 if (rdev0
->preferred_minor
!= unit
) {
4923 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4924 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4928 md_probe(dev
, NULL
, NULL
);
4929 mddev
= mddev_find(dev
);
4930 if (!mddev
|| !mddev
->gendisk
) {
4934 "md: cannot allocate memory for md drive.\n");
4937 if (mddev_lock(mddev
))
4938 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4940 else if (mddev
->raid_disks
|| mddev
->major_version
4941 || !list_empty(&mddev
->disks
)) {
4943 "md: %s already running, cannot run %s\n",
4944 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4945 mddev_unlock(mddev
);
4947 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4948 mddev
->persistent
= 1;
4949 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4950 list_del_init(&rdev
->same_set
);
4951 if (bind_rdev_to_array(rdev
, mddev
))
4954 autorun_array(mddev
);
4955 mddev_unlock(mddev
);
4957 /* on success, candidates will be empty, on error
4960 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4961 list_del_init(&rdev
->same_set
);
4966 printk(KERN_INFO
"md: ... autorun DONE.\n");
4968 #endif /* !MODULE */
4970 static int get_version(void __user
* arg
)
4974 ver
.major
= MD_MAJOR_VERSION
;
4975 ver
.minor
= MD_MINOR_VERSION
;
4976 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4978 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4984 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4986 mdu_array_info_t info
;
4987 int nr
,working
,insync
,failed
,spare
;
4990 nr
=working
=insync
=failed
=spare
=0;
4991 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4993 if (test_bit(Faulty
, &rdev
->flags
))
4997 if (test_bit(In_sync
, &rdev
->flags
))
5004 info
.major_version
= mddev
->major_version
;
5005 info
.minor_version
= mddev
->minor_version
;
5006 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5007 info
.ctime
= mddev
->ctime
;
5008 info
.level
= mddev
->level
;
5009 info
.size
= mddev
->dev_sectors
/ 2;
5010 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5013 info
.raid_disks
= mddev
->raid_disks
;
5014 info
.md_minor
= mddev
->md_minor
;
5015 info
.not_persistent
= !mddev
->persistent
;
5017 info
.utime
= mddev
->utime
;
5020 info
.state
= (1<<MD_SB_CLEAN
);
5021 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5022 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5023 info
.active_disks
= insync
;
5024 info
.working_disks
= working
;
5025 info
.failed_disks
= failed
;
5026 info
.spare_disks
= spare
;
5028 info
.layout
= mddev
->layout
;
5029 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5031 if (copy_to_user(arg
, &info
, sizeof(info
)))
5037 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
5039 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5040 char *ptr
, *buf
= NULL
;
5043 if (md_allow_write(mddev
))
5044 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5046 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5051 /* bitmap disabled, zero the first byte and copy out */
5052 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5053 file
->pathname
[0] = '\0';
5057 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5061 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5065 strcpy(file
->pathname
, ptr
);
5069 if (copy_to_user(arg
, file
, sizeof(*file
)))
5077 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5079 mdu_disk_info_t info
;
5082 if (copy_from_user(&info
, arg
, sizeof(info
)))
5085 rdev
= find_rdev_nr(mddev
, info
.number
);
5087 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5088 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5089 info
.raid_disk
= rdev
->raid_disk
;
5091 if (test_bit(Faulty
, &rdev
->flags
))
5092 info
.state
|= (1<<MD_DISK_FAULTY
);
5093 else if (test_bit(In_sync
, &rdev
->flags
)) {
5094 info
.state
|= (1<<MD_DISK_ACTIVE
);
5095 info
.state
|= (1<<MD_DISK_SYNC
);
5097 if (test_bit(WriteMostly
, &rdev
->flags
))
5098 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5100 info
.major
= info
.minor
= 0;
5101 info
.raid_disk
= -1;
5102 info
.state
= (1<<MD_DISK_REMOVED
);
5105 if (copy_to_user(arg
, &info
, sizeof(info
)))
5111 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5113 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5115 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5117 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5120 if (!mddev
->raid_disks
) {
5122 /* expecting a device which has a superblock */
5123 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5126 "md: md_import_device returned %ld\n",
5128 return PTR_ERR(rdev
);
5130 if (!list_empty(&mddev
->disks
)) {
5131 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5132 mdk_rdev_t
, same_set
);
5133 err
= super_types
[mddev
->major_version
]
5134 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5137 "md: %s has different UUID to %s\n",
5138 bdevname(rdev
->bdev
,b
),
5139 bdevname(rdev0
->bdev
,b2
));
5144 err
= bind_rdev_to_array(rdev
, mddev
);
5151 * add_new_disk can be used once the array is assembled
5152 * to add "hot spares". They must already have a superblock
5157 if (!mddev
->pers
->hot_add_disk
) {
5159 "%s: personality does not support diskops!\n",
5163 if (mddev
->persistent
)
5164 rdev
= md_import_device(dev
, mddev
->major_version
,
5165 mddev
->minor_version
);
5167 rdev
= md_import_device(dev
, -1, -1);
5170 "md: md_import_device returned %ld\n",
5172 return PTR_ERR(rdev
);
5174 /* set saved_raid_disk if appropriate */
5175 if (!mddev
->persistent
) {
5176 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5177 info
->raid_disk
< mddev
->raid_disks
) {
5178 rdev
->raid_disk
= info
->raid_disk
;
5179 set_bit(In_sync
, &rdev
->flags
);
5181 rdev
->raid_disk
= -1;
5183 super_types
[mddev
->major_version
].
5184 validate_super(mddev
, rdev
);
5185 if (test_bit(In_sync
, &rdev
->flags
))
5186 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5188 rdev
->saved_raid_disk
= -1;
5190 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5191 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5192 set_bit(WriteMostly
, &rdev
->flags
);
5194 clear_bit(WriteMostly
, &rdev
->flags
);
5196 rdev
->raid_disk
= -1;
5197 err
= bind_rdev_to_array(rdev
, mddev
);
5198 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5199 /* If there is hot_add_disk but no hot_remove_disk
5200 * then added disks for geometry changes,
5201 * and should be added immediately.
5203 super_types
[mddev
->major_version
].
5204 validate_super(mddev
, rdev
);
5205 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5207 unbind_rdev_from_array(rdev
);
5212 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5214 md_update_sb(mddev
, 1);
5215 if (mddev
->degraded
)
5216 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5217 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5218 md_wakeup_thread(mddev
->thread
);
5222 /* otherwise, add_new_disk is only allowed
5223 * for major_version==0 superblocks
5225 if (mddev
->major_version
!= 0) {
5226 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5231 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5233 rdev
= md_import_device(dev
, -1, 0);
5236 "md: error, md_import_device() returned %ld\n",
5238 return PTR_ERR(rdev
);
5240 rdev
->desc_nr
= info
->number
;
5241 if (info
->raid_disk
< mddev
->raid_disks
)
5242 rdev
->raid_disk
= info
->raid_disk
;
5244 rdev
->raid_disk
= -1;
5246 if (rdev
->raid_disk
< mddev
->raid_disks
)
5247 if (info
->state
& (1<<MD_DISK_SYNC
))
5248 set_bit(In_sync
, &rdev
->flags
);
5250 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5251 set_bit(WriteMostly
, &rdev
->flags
);
5253 if (!mddev
->persistent
) {
5254 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5255 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5257 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5258 rdev
->sectors
= rdev
->sb_start
;
5260 err
= bind_rdev_to_array(rdev
, mddev
);
5270 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5272 char b
[BDEVNAME_SIZE
];
5275 rdev
= find_rdev(mddev
, dev
);
5279 if (rdev
->raid_disk
>= 0)
5282 kick_rdev_from_array(rdev
);
5283 md_update_sb(mddev
, 1);
5284 md_new_event(mddev
);
5288 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5289 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5293 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5295 char b
[BDEVNAME_SIZE
];
5302 if (mddev
->major_version
!= 0) {
5303 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5304 " version-0 superblocks.\n",
5308 if (!mddev
->pers
->hot_add_disk
) {
5310 "%s: personality does not support diskops!\n",
5315 rdev
= md_import_device(dev
, -1, 0);
5318 "md: error, md_import_device() returned %ld\n",
5323 if (mddev
->persistent
)
5324 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5326 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5328 rdev
->sectors
= rdev
->sb_start
;
5330 if (test_bit(Faulty
, &rdev
->flags
)) {
5332 "md: can not hot-add faulty %s disk to %s!\n",
5333 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5337 clear_bit(In_sync
, &rdev
->flags
);
5339 rdev
->saved_raid_disk
= -1;
5340 err
= bind_rdev_to_array(rdev
, mddev
);
5345 * The rest should better be atomic, we can have disk failures
5346 * noticed in interrupt contexts ...
5349 rdev
->raid_disk
= -1;
5351 md_update_sb(mddev
, 1);
5354 * Kick recovery, maybe this spare has to be added to the
5355 * array immediately.
5357 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5358 md_wakeup_thread(mddev
->thread
);
5359 md_new_event(mddev
);
5367 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5372 if (!mddev
->pers
->quiesce
)
5374 if (mddev
->recovery
|| mddev
->sync_thread
)
5376 /* we should be able to change the bitmap.. */
5382 return -EEXIST
; /* cannot add when bitmap is present */
5383 mddev
->bitmap_info
.file
= fget(fd
);
5385 if (mddev
->bitmap_info
.file
== NULL
) {
5386 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5391 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5393 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5395 fput(mddev
->bitmap_info
.file
);
5396 mddev
->bitmap_info
.file
= NULL
;
5399 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5400 } else if (mddev
->bitmap
== NULL
)
5401 return -ENOENT
; /* cannot remove what isn't there */
5404 mddev
->pers
->quiesce(mddev
, 1);
5406 err
= bitmap_create(mddev
);
5408 err
= bitmap_load(mddev
);
5410 if (fd
< 0 || err
) {
5411 bitmap_destroy(mddev
);
5412 fd
= -1; /* make sure to put the file */
5414 mddev
->pers
->quiesce(mddev
, 0);
5417 if (mddev
->bitmap_info
.file
) {
5418 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5419 fput(mddev
->bitmap_info
.file
);
5421 mddev
->bitmap_info
.file
= NULL
;
5428 * set_array_info is used two different ways
5429 * The original usage is when creating a new array.
5430 * In this usage, raid_disks is > 0 and it together with
5431 * level, size, not_persistent,layout,chunksize determine the
5432 * shape of the array.
5433 * This will always create an array with a type-0.90.0 superblock.
5434 * The newer usage is when assembling an array.
5435 * In this case raid_disks will be 0, and the major_version field is
5436 * use to determine which style super-blocks are to be found on the devices.
5437 * The minor and patch _version numbers are also kept incase the
5438 * super_block handler wishes to interpret them.
5440 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5443 if (info
->raid_disks
== 0) {
5444 /* just setting version number for superblock loading */
5445 if (info
->major_version
< 0 ||
5446 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5447 super_types
[info
->major_version
].name
== NULL
) {
5448 /* maybe try to auto-load a module? */
5450 "md: superblock version %d not known\n",
5451 info
->major_version
);
5454 mddev
->major_version
= info
->major_version
;
5455 mddev
->minor_version
= info
->minor_version
;
5456 mddev
->patch_version
= info
->patch_version
;
5457 mddev
->persistent
= !info
->not_persistent
;
5458 /* ensure mddev_put doesn't delete this now that there
5459 * is some minimal configuration.
5461 mddev
->ctime
= get_seconds();
5464 mddev
->major_version
= MD_MAJOR_VERSION
;
5465 mddev
->minor_version
= MD_MINOR_VERSION
;
5466 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5467 mddev
->ctime
= get_seconds();
5469 mddev
->level
= info
->level
;
5470 mddev
->clevel
[0] = 0;
5471 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5472 mddev
->raid_disks
= info
->raid_disks
;
5473 /* don't set md_minor, it is determined by which /dev/md* was
5476 if (info
->state
& (1<<MD_SB_CLEAN
))
5477 mddev
->recovery_cp
= MaxSector
;
5479 mddev
->recovery_cp
= 0;
5480 mddev
->persistent
= ! info
->not_persistent
;
5481 mddev
->external
= 0;
5483 mddev
->layout
= info
->layout
;
5484 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5486 mddev
->max_disks
= MD_SB_DISKS
;
5488 if (mddev
->persistent
)
5490 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5492 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5493 mddev
->bitmap_info
.offset
= 0;
5495 mddev
->reshape_position
= MaxSector
;
5498 * Generate a 128 bit UUID
5500 get_random_bytes(mddev
->uuid
, 16);
5502 mddev
->new_level
= mddev
->level
;
5503 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5504 mddev
->new_layout
= mddev
->layout
;
5505 mddev
->delta_disks
= 0;
5510 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5512 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5514 if (mddev
->external_size
)
5517 mddev
->array_sectors
= array_sectors
;
5519 EXPORT_SYMBOL(md_set_array_sectors
);
5521 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5525 int fit
= (num_sectors
== 0);
5527 if (mddev
->pers
->resize
== NULL
)
5529 /* The "num_sectors" is the number of sectors of each device that
5530 * is used. This can only make sense for arrays with redundancy.
5531 * linear and raid0 always use whatever space is available. We can only
5532 * consider changing this number if no resync or reconstruction is
5533 * happening, and if the new size is acceptable. It must fit before the
5534 * sb_start or, if that is <data_offset, it must fit before the size
5535 * of each device. If num_sectors is zero, we find the largest size
5539 if (mddev
->sync_thread
)
5542 /* Sorry, cannot grow a bitmap yet, just remove it,
5546 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5547 sector_t avail
= rdev
->sectors
;
5549 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5550 num_sectors
= avail
;
5551 if (avail
< num_sectors
)
5554 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5556 revalidate_disk(mddev
->gendisk
);
5560 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5563 /* change the number of raid disks */
5564 if (mddev
->pers
->check_reshape
== NULL
)
5566 if (raid_disks
<= 0 ||
5567 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5569 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5571 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5573 rv
= mddev
->pers
->check_reshape(mddev
);
5579 * update_array_info is used to change the configuration of an
5581 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5582 * fields in the info are checked against the array.
5583 * Any differences that cannot be handled will cause an error.
5584 * Normally, only one change can be managed at a time.
5586 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5592 /* calculate expected state,ignoring low bits */
5593 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5594 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5596 if (mddev
->major_version
!= info
->major_version
||
5597 mddev
->minor_version
!= info
->minor_version
||
5598 /* mddev->patch_version != info->patch_version || */
5599 mddev
->ctime
!= info
->ctime
||
5600 mddev
->level
!= info
->level
||
5601 /* mddev->layout != info->layout || */
5602 !mddev
->persistent
!= info
->not_persistent
||
5603 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5604 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5605 ((state
^info
->state
) & 0xfffffe00)
5608 /* Check there is only one change */
5609 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5611 if (mddev
->raid_disks
!= info
->raid_disks
)
5613 if (mddev
->layout
!= info
->layout
)
5615 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5622 if (mddev
->layout
!= info
->layout
) {
5624 * we don't need to do anything at the md level, the
5625 * personality will take care of it all.
5627 if (mddev
->pers
->check_reshape
== NULL
)
5630 mddev
->new_layout
= info
->layout
;
5631 rv
= mddev
->pers
->check_reshape(mddev
);
5633 mddev
->new_layout
= mddev
->layout
;
5637 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5638 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5640 if (mddev
->raid_disks
!= info
->raid_disks
)
5641 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5643 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5644 if (mddev
->pers
->quiesce
== NULL
)
5646 if (mddev
->recovery
|| mddev
->sync_thread
)
5648 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5649 /* add the bitmap */
5652 if (mddev
->bitmap_info
.default_offset
== 0)
5654 mddev
->bitmap_info
.offset
=
5655 mddev
->bitmap_info
.default_offset
;
5656 mddev
->pers
->quiesce(mddev
, 1);
5657 rv
= bitmap_create(mddev
);
5659 rv
= bitmap_load(mddev
);
5661 bitmap_destroy(mddev
);
5662 mddev
->pers
->quiesce(mddev
, 0);
5664 /* remove the bitmap */
5667 if (mddev
->bitmap
->file
)
5669 mddev
->pers
->quiesce(mddev
, 1);
5670 bitmap_destroy(mddev
);
5671 mddev
->pers
->quiesce(mddev
, 0);
5672 mddev
->bitmap_info
.offset
= 0;
5675 md_update_sb(mddev
, 1);
5679 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5683 if (mddev
->pers
== NULL
)
5686 rdev
= find_rdev(mddev
, dev
);
5690 md_error(mddev
, rdev
);
5695 * We have a problem here : there is no easy way to give a CHS
5696 * virtual geometry. We currently pretend that we have a 2 heads
5697 * 4 sectors (with a BIG number of cylinders...). This drives
5698 * dosfs just mad... ;-)
5700 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5702 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5706 geo
->cylinders
= mddev
->array_sectors
/ 8;
5710 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5711 unsigned int cmd
, unsigned long arg
)
5714 void __user
*argp
= (void __user
*)arg
;
5715 mddev_t
*mddev
= NULL
;
5718 if (!capable(CAP_SYS_ADMIN
))
5722 * Commands dealing with the RAID driver but not any
5728 err
= get_version(argp
);
5731 case PRINT_RAID_DEBUG
:
5739 autostart_arrays(arg
);
5746 * Commands creating/starting a new array:
5749 mddev
= bdev
->bd_disk
->private_data
;
5756 err
= mddev_lock(mddev
);
5759 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5766 case SET_ARRAY_INFO
:
5768 mdu_array_info_t info
;
5770 memset(&info
, 0, sizeof(info
));
5771 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5776 err
= update_array_info(mddev
, &info
);
5778 printk(KERN_WARNING
"md: couldn't update"
5779 " array info. %d\n", err
);
5784 if (!list_empty(&mddev
->disks
)) {
5786 "md: array %s already has disks!\n",
5791 if (mddev
->raid_disks
) {
5793 "md: array %s already initialised!\n",
5798 err
= set_array_info(mddev
, &info
);
5800 printk(KERN_WARNING
"md: couldn't set"
5801 " array info. %d\n", err
);
5811 * Commands querying/configuring an existing array:
5813 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5814 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5815 if ((!mddev
->raid_disks
&& !mddev
->external
)
5816 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5817 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5818 && cmd
!= GET_BITMAP_FILE
) {
5824 * Commands even a read-only array can execute:
5828 case GET_ARRAY_INFO
:
5829 err
= get_array_info(mddev
, argp
);
5832 case GET_BITMAP_FILE
:
5833 err
= get_bitmap_file(mddev
, argp
);
5837 err
= get_disk_info(mddev
, argp
);
5840 case RESTART_ARRAY_RW
:
5841 err
= restart_array(mddev
);
5845 err
= do_md_stop(mddev
, 0, 1);
5849 err
= md_set_readonly(mddev
, 1);
5853 if (get_user(ro
, (int __user
*)(arg
))) {
5859 /* if the bdev is going readonly the value of mddev->ro
5860 * does not matter, no writes are coming
5865 /* are we are already prepared for writes? */
5869 /* transitioning to readauto need only happen for
5870 * arrays that call md_write_start
5873 err
= restart_array(mddev
);
5876 set_disk_ro(mddev
->gendisk
, 0);
5883 * The remaining ioctls are changing the state of the
5884 * superblock, so we do not allow them on read-only arrays.
5885 * However non-MD ioctls (e.g. get-size) will still come through
5886 * here and hit the 'default' below, so only disallow
5887 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5889 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5890 if (mddev
->ro
== 2) {
5892 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5893 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5894 md_wakeup_thread(mddev
->thread
);
5905 mdu_disk_info_t info
;
5906 if (copy_from_user(&info
, argp
, sizeof(info
)))
5909 err
= add_new_disk(mddev
, &info
);
5913 case HOT_REMOVE_DISK
:
5914 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5918 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5921 case SET_DISK_FAULTY
:
5922 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5926 err
= do_md_run(mddev
);
5929 case SET_BITMAP_FILE
:
5930 err
= set_bitmap_file(mddev
, (int)arg
);
5940 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5942 mddev
->hold_active
= 0;
5943 mddev_unlock(mddev
);
5952 #ifdef CONFIG_COMPAT
5953 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5954 unsigned int cmd
, unsigned long arg
)
5957 case HOT_REMOVE_DISK
:
5959 case SET_DISK_FAULTY
:
5960 case SET_BITMAP_FILE
:
5961 /* These take in integer arg, do not convert */
5964 arg
= (unsigned long)compat_ptr(arg
);
5968 return md_ioctl(bdev
, mode
, cmd
, arg
);
5970 #endif /* CONFIG_COMPAT */
5972 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5975 * Succeed if we can lock the mddev, which confirms that
5976 * it isn't being stopped right now.
5978 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5981 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5982 /* we are racing with mddev_put which is discarding this
5986 /* Wait until bdev->bd_disk is definitely gone */
5987 flush_workqueue(md_misc_wq
);
5988 /* Then retry the open from the top */
5989 return -ERESTARTSYS
;
5991 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5993 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5997 atomic_inc(&mddev
->openers
);
5998 mutex_unlock(&mddev
->open_mutex
);
6000 check_disk_change(bdev
);
6005 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6007 mddev_t
*mddev
= disk
->private_data
;
6010 atomic_dec(&mddev
->openers
);
6016 static int md_media_changed(struct gendisk
*disk
)
6018 mddev_t
*mddev
= disk
->private_data
;
6020 return mddev
->changed
;
6023 static int md_revalidate(struct gendisk
*disk
)
6025 mddev_t
*mddev
= disk
->private_data
;
6030 static const struct block_device_operations md_fops
=
6032 .owner
= THIS_MODULE
,
6034 .release
= md_release
,
6036 #ifdef CONFIG_COMPAT
6037 .compat_ioctl
= md_compat_ioctl
,
6039 .getgeo
= md_getgeo
,
6040 .media_changed
= md_media_changed
,
6041 .revalidate_disk
= md_revalidate
,
6044 static int md_thread(void * arg
)
6046 mdk_thread_t
*thread
= arg
;
6049 * md_thread is a 'system-thread', it's priority should be very
6050 * high. We avoid resource deadlocks individually in each
6051 * raid personality. (RAID5 does preallocation) We also use RR and
6052 * the very same RT priority as kswapd, thus we will never get
6053 * into a priority inversion deadlock.
6055 * we definitely have to have equal or higher priority than
6056 * bdflush, otherwise bdflush will deadlock if there are too
6057 * many dirty RAID5 blocks.
6060 allow_signal(SIGKILL
);
6061 while (!kthread_should_stop()) {
6063 /* We need to wait INTERRUPTIBLE so that
6064 * we don't add to the load-average.
6065 * That means we need to be sure no signals are
6068 if (signal_pending(current
))
6069 flush_signals(current
);
6071 wait_event_interruptible_timeout
6073 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6074 || kthread_should_stop(),
6077 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6078 if (!kthread_should_stop())
6079 thread
->run(thread
->mddev
);
6085 void md_wakeup_thread(mdk_thread_t
*thread
)
6088 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6089 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6090 wake_up(&thread
->wqueue
);
6094 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6097 mdk_thread_t
*thread
;
6099 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6103 init_waitqueue_head(&thread
->wqueue
);
6106 thread
->mddev
= mddev
;
6107 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6108 thread
->tsk
= kthread_run(md_thread
, thread
,
6110 mdname(thread
->mddev
),
6111 name
?: mddev
->pers
->name
);
6112 if (IS_ERR(thread
->tsk
)) {
6119 void md_unregister_thread(mdk_thread_t
*thread
)
6123 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6125 kthread_stop(thread
->tsk
);
6129 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6136 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6139 if (mddev
->external
)
6140 set_bit(Blocked
, &rdev
->flags
);
6142 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6144 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6145 __builtin_return_address(0),__builtin_return_address(1),
6146 __builtin_return_address(2),__builtin_return_address(3));
6150 if (!mddev
->pers
->error_handler
)
6152 mddev
->pers
->error_handler(mddev
,rdev
);
6153 if (mddev
->degraded
)
6154 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6155 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6156 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6157 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6158 md_wakeup_thread(mddev
->thread
);
6159 if (mddev
->event_work
.func
)
6160 queue_work(md_misc_wq
, &mddev
->event_work
);
6161 md_new_event_inintr(mddev
);
6164 /* seq_file implementation /proc/mdstat */
6166 static void status_unused(struct seq_file
*seq
)
6171 seq_printf(seq
, "unused devices: ");
6173 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6174 char b
[BDEVNAME_SIZE
];
6176 seq_printf(seq
, "%s ",
6177 bdevname(rdev
->bdev
,b
));
6180 seq_printf(seq
, "<none>");
6182 seq_printf(seq
, "\n");
6186 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6188 sector_t max_sectors
, resync
, res
;
6189 unsigned long dt
, db
;
6192 unsigned int per_milli
;
6194 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6196 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6197 max_sectors
= mddev
->resync_max_sectors
;
6199 max_sectors
= mddev
->dev_sectors
;
6202 * Should not happen.
6208 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6209 * in a sector_t, and (max_sectors>>scale) will fit in a
6210 * u32, as those are the requirements for sector_div.
6211 * Thus 'scale' must be at least 10
6214 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6215 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6218 res
= (resync
>>scale
)*1000;
6219 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6223 int i
, x
= per_milli
/50, y
= 20-x
;
6224 seq_printf(seq
, "[");
6225 for (i
= 0; i
< x
; i
++)
6226 seq_printf(seq
, "=");
6227 seq_printf(seq
, ">");
6228 for (i
= 0; i
< y
; i
++)
6229 seq_printf(seq
, ".");
6230 seq_printf(seq
, "] ");
6232 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6233 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6235 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6237 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6238 "resync" : "recovery"))),
6239 per_milli
/10, per_milli
% 10,
6240 (unsigned long long) resync
/2,
6241 (unsigned long long) max_sectors
/2);
6244 * dt: time from mark until now
6245 * db: blocks written from mark until now
6246 * rt: remaining time
6248 * rt is a sector_t, so could be 32bit or 64bit.
6249 * So we divide before multiply in case it is 32bit and close
6251 * We scale the divisor (db) by 32 to avoid loosing precision
6252 * near the end of resync when the number of remaining sectors
6254 * We then divide rt by 32 after multiplying by db to compensate.
6255 * The '+1' avoids division by zero if db is very small.
6257 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6259 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6260 - mddev
->resync_mark_cnt
;
6262 rt
= max_sectors
- resync
; /* number of remaining sectors */
6263 sector_div(rt
, db
/32+1);
6267 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6268 ((unsigned long)rt
% 60)/6);
6270 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6273 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6275 struct list_head
*tmp
;
6285 spin_lock(&all_mddevs_lock
);
6286 list_for_each(tmp
,&all_mddevs
)
6288 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6290 spin_unlock(&all_mddevs_lock
);
6293 spin_unlock(&all_mddevs_lock
);
6295 return (void*)2;/* tail */
6299 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6301 struct list_head
*tmp
;
6302 mddev_t
*next_mddev
, *mddev
= v
;
6308 spin_lock(&all_mddevs_lock
);
6310 tmp
= all_mddevs
.next
;
6312 tmp
= mddev
->all_mddevs
.next
;
6313 if (tmp
!= &all_mddevs
)
6314 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6316 next_mddev
= (void*)2;
6319 spin_unlock(&all_mddevs_lock
);
6327 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6331 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6335 struct mdstat_info
{
6339 static int md_seq_show(struct seq_file
*seq
, void *v
)
6344 struct mdstat_info
*mi
= seq
->private;
6345 struct bitmap
*bitmap
;
6347 if (v
== (void*)1) {
6348 struct mdk_personality
*pers
;
6349 seq_printf(seq
, "Personalities : ");
6350 spin_lock(&pers_lock
);
6351 list_for_each_entry(pers
, &pers_list
, list
)
6352 seq_printf(seq
, "[%s] ", pers
->name
);
6354 spin_unlock(&pers_lock
);
6355 seq_printf(seq
, "\n");
6356 mi
->event
= atomic_read(&md_event_count
);
6359 if (v
== (void*)2) {
6364 if (mddev_lock(mddev
) < 0)
6367 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6368 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6369 mddev
->pers
? "" : "in");
6372 seq_printf(seq
, " (read-only)");
6374 seq_printf(seq
, " (auto-read-only)");
6375 seq_printf(seq
, " %s", mddev
->pers
->name
);
6379 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6380 char b
[BDEVNAME_SIZE
];
6381 seq_printf(seq
, " %s[%d]",
6382 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6383 if (test_bit(WriteMostly
, &rdev
->flags
))
6384 seq_printf(seq
, "(W)");
6385 if (test_bit(Faulty
, &rdev
->flags
)) {
6386 seq_printf(seq
, "(F)");
6388 } else if (rdev
->raid_disk
< 0)
6389 seq_printf(seq
, "(S)"); /* spare */
6390 sectors
+= rdev
->sectors
;
6393 if (!list_empty(&mddev
->disks
)) {
6395 seq_printf(seq
, "\n %llu blocks",
6396 (unsigned long long)
6397 mddev
->array_sectors
/ 2);
6399 seq_printf(seq
, "\n %llu blocks",
6400 (unsigned long long)sectors
/ 2);
6402 if (mddev
->persistent
) {
6403 if (mddev
->major_version
!= 0 ||
6404 mddev
->minor_version
!= 90) {
6405 seq_printf(seq
," super %d.%d",
6406 mddev
->major_version
,
6407 mddev
->minor_version
);
6409 } else if (mddev
->external
)
6410 seq_printf(seq
, " super external:%s",
6411 mddev
->metadata_type
);
6413 seq_printf(seq
, " super non-persistent");
6416 mddev
->pers
->status(seq
, mddev
);
6417 seq_printf(seq
, "\n ");
6418 if (mddev
->pers
->sync_request
) {
6419 if (mddev
->curr_resync
> 2) {
6420 status_resync(seq
, mddev
);
6421 seq_printf(seq
, "\n ");
6422 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6423 seq_printf(seq
, "\tresync=DELAYED\n ");
6424 else if (mddev
->recovery_cp
< MaxSector
)
6425 seq_printf(seq
, "\tresync=PENDING\n ");
6428 seq_printf(seq
, "\n ");
6430 if ((bitmap
= mddev
->bitmap
)) {
6431 unsigned long chunk_kb
;
6432 unsigned long flags
;
6433 spin_lock_irqsave(&bitmap
->lock
, flags
);
6434 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6435 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6437 bitmap
->pages
- bitmap
->missing_pages
,
6439 (bitmap
->pages
- bitmap
->missing_pages
)
6440 << (PAGE_SHIFT
- 10),
6441 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6442 chunk_kb
? "KB" : "B");
6444 seq_printf(seq
, ", file: ");
6445 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6448 seq_printf(seq
, "\n");
6449 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6452 seq_printf(seq
, "\n");
6454 mddev_unlock(mddev
);
6459 static const struct seq_operations md_seq_ops
= {
6460 .start
= md_seq_start
,
6461 .next
= md_seq_next
,
6462 .stop
= md_seq_stop
,
6463 .show
= md_seq_show
,
6466 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6469 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6473 error
= seq_open(file
, &md_seq_ops
);
6477 struct seq_file
*p
= file
->private_data
;
6479 mi
->event
= atomic_read(&md_event_count
);
6484 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6486 struct seq_file
*m
= filp
->private_data
;
6487 struct mdstat_info
*mi
= m
->private;
6490 poll_wait(filp
, &md_event_waiters
, wait
);
6492 /* always allow read */
6493 mask
= POLLIN
| POLLRDNORM
;
6495 if (mi
->event
!= atomic_read(&md_event_count
))
6496 mask
|= POLLERR
| POLLPRI
;
6500 static const struct file_operations md_seq_fops
= {
6501 .owner
= THIS_MODULE
,
6502 .open
= md_seq_open
,
6504 .llseek
= seq_lseek
,
6505 .release
= seq_release_private
,
6506 .poll
= mdstat_poll
,
6509 int register_md_personality(struct mdk_personality
*p
)
6511 spin_lock(&pers_lock
);
6512 list_add_tail(&p
->list
, &pers_list
);
6513 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6514 spin_unlock(&pers_lock
);
6518 int unregister_md_personality(struct mdk_personality
*p
)
6520 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6521 spin_lock(&pers_lock
);
6522 list_del_init(&p
->list
);
6523 spin_unlock(&pers_lock
);
6527 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6535 rdev_for_each_rcu(rdev
, mddev
) {
6536 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6537 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6538 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6539 atomic_read(&disk
->sync_io
);
6540 /* sync IO will cause sync_io to increase before the disk_stats
6541 * as sync_io is counted when a request starts, and
6542 * disk_stats is counted when it completes.
6543 * So resync activity will cause curr_events to be smaller than
6544 * when there was no such activity.
6545 * non-sync IO will cause disk_stat to increase without
6546 * increasing sync_io so curr_events will (eventually)
6547 * be larger than it was before. Once it becomes
6548 * substantially larger, the test below will cause
6549 * the array to appear non-idle, and resync will slow
6551 * If there is a lot of outstanding resync activity when
6552 * we set last_event to curr_events, then all that activity
6553 * completing might cause the array to appear non-idle
6554 * and resync will be slowed down even though there might
6555 * not have been non-resync activity. This will only
6556 * happen once though. 'last_events' will soon reflect
6557 * the state where there is little or no outstanding
6558 * resync requests, and further resync activity will
6559 * always make curr_events less than last_events.
6562 if (init
|| curr_events
- rdev
->last_events
> 64) {
6563 rdev
->last_events
= curr_events
;
6571 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6573 /* another "blocks" (512byte) blocks have been synced */
6574 atomic_sub(blocks
, &mddev
->recovery_active
);
6575 wake_up(&mddev
->recovery_wait
);
6577 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6578 md_wakeup_thread(mddev
->thread
);
6579 // stop recovery, signal do_sync ....
6584 /* md_write_start(mddev, bi)
6585 * If we need to update some array metadata (e.g. 'active' flag
6586 * in superblock) before writing, schedule a superblock update
6587 * and wait for it to complete.
6589 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6592 if (bio_data_dir(bi
) != WRITE
)
6595 BUG_ON(mddev
->ro
== 1);
6596 if (mddev
->ro
== 2) {
6597 /* need to switch to read/write */
6599 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6600 md_wakeup_thread(mddev
->thread
);
6601 md_wakeup_thread(mddev
->sync_thread
);
6604 atomic_inc(&mddev
->writes_pending
);
6605 if (mddev
->safemode
== 1)
6606 mddev
->safemode
= 0;
6607 if (mddev
->in_sync
) {
6608 spin_lock_irq(&mddev
->write_lock
);
6609 if (mddev
->in_sync
) {
6611 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6612 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6613 md_wakeup_thread(mddev
->thread
);
6616 spin_unlock_irq(&mddev
->write_lock
);
6619 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6620 wait_event(mddev
->sb_wait
,
6621 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6624 void md_write_end(mddev_t
*mddev
)
6626 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6627 if (mddev
->safemode
== 2)
6628 md_wakeup_thread(mddev
->thread
);
6629 else if (mddev
->safemode_delay
)
6630 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6634 /* md_allow_write(mddev)
6635 * Calling this ensures that the array is marked 'active' so that writes
6636 * may proceed without blocking. It is important to call this before
6637 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6638 * Must be called with mddev_lock held.
6640 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6641 * is dropped, so return -EAGAIN after notifying userspace.
6643 int md_allow_write(mddev_t
*mddev
)
6649 if (!mddev
->pers
->sync_request
)
6652 spin_lock_irq(&mddev
->write_lock
);
6653 if (mddev
->in_sync
) {
6655 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6656 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6657 if (mddev
->safemode_delay
&&
6658 mddev
->safemode
== 0)
6659 mddev
->safemode
= 1;
6660 spin_unlock_irq(&mddev
->write_lock
);
6661 md_update_sb(mddev
, 0);
6662 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6664 spin_unlock_irq(&mddev
->write_lock
);
6666 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6671 EXPORT_SYMBOL_GPL(md_allow_write
);
6673 void md_unplug(mddev_t
*mddev
)
6676 blk_unplug(mddev
->queue
);
6678 mddev
->plug
->unplug_fn(mddev
->plug
);
6681 #define SYNC_MARKS 10
6682 #define SYNC_MARK_STEP (3*HZ)
6683 void md_do_sync(mddev_t
*mddev
)
6686 unsigned int currspeed
= 0,
6688 sector_t max_sectors
,j
, io_sectors
;
6689 unsigned long mark
[SYNC_MARKS
];
6690 sector_t mark_cnt
[SYNC_MARKS
];
6692 struct list_head
*tmp
;
6693 sector_t last_check
;
6698 /* just incase thread restarts... */
6699 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6701 if (mddev
->ro
) /* never try to sync a read-only array */
6704 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6705 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6706 desc
= "data-check";
6707 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6708 desc
= "requested-resync";
6711 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6716 /* we overload curr_resync somewhat here.
6717 * 0 == not engaged in resync at all
6718 * 2 == checking that there is no conflict with another sync
6719 * 1 == like 2, but have yielded to allow conflicting resync to
6721 * other == active in resync - this many blocks
6723 * Before starting a resync we must have set curr_resync to
6724 * 2, and then checked that every "conflicting" array has curr_resync
6725 * less than ours. When we find one that is the same or higher
6726 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6727 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6728 * This will mean we have to start checking from the beginning again.
6733 mddev
->curr_resync
= 2;
6736 if (kthread_should_stop())
6737 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6739 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6741 for_each_mddev(mddev2
, tmp
) {
6742 if (mddev2
== mddev
)
6744 if (!mddev
->parallel_resync
6745 && mddev2
->curr_resync
6746 && match_mddev_units(mddev
, mddev2
)) {
6748 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6749 /* arbitrarily yield */
6750 mddev
->curr_resync
= 1;
6751 wake_up(&resync_wait
);
6753 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6754 /* no need to wait here, we can wait the next
6755 * time 'round when curr_resync == 2
6758 /* We need to wait 'interruptible' so as not to
6759 * contribute to the load average, and not to
6760 * be caught by 'softlockup'
6762 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6763 if (!kthread_should_stop() &&
6764 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6765 printk(KERN_INFO
"md: delaying %s of %s"
6766 " until %s has finished (they"
6767 " share one or more physical units)\n",
6768 desc
, mdname(mddev
), mdname(mddev2
));
6770 if (signal_pending(current
))
6771 flush_signals(current
);
6773 finish_wait(&resync_wait
, &wq
);
6776 finish_wait(&resync_wait
, &wq
);
6779 } while (mddev
->curr_resync
< 2);
6782 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6783 /* resync follows the size requested by the personality,
6784 * which defaults to physical size, but can be virtual size
6786 max_sectors
= mddev
->resync_max_sectors
;
6787 mddev
->resync_mismatches
= 0;
6788 /* we don't use the checkpoint if there's a bitmap */
6789 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6790 j
= mddev
->resync_min
;
6791 else if (!mddev
->bitmap
)
6792 j
= mddev
->recovery_cp
;
6794 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6795 max_sectors
= mddev
->dev_sectors
;
6797 /* recovery follows the physical size of devices */
6798 max_sectors
= mddev
->dev_sectors
;
6801 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6802 if (rdev
->raid_disk
>= 0 &&
6803 !test_bit(Faulty
, &rdev
->flags
) &&
6804 !test_bit(In_sync
, &rdev
->flags
) &&
6805 rdev
->recovery_offset
< j
)
6806 j
= rdev
->recovery_offset
;
6810 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6811 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6812 " %d KB/sec/disk.\n", speed_min(mddev
));
6813 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6814 "(but not more than %d KB/sec) for %s.\n",
6815 speed_max(mddev
), desc
);
6817 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6820 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6822 mark_cnt
[m
] = io_sectors
;
6825 mddev
->resync_mark
= mark
[last_mark
];
6826 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6829 * Tune reconstruction:
6831 window
= 32*(PAGE_SIZE
/512);
6832 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6833 window
/2,(unsigned long long) max_sectors
/2);
6835 atomic_set(&mddev
->recovery_active
, 0);
6840 "md: resuming %s of %s from checkpoint.\n",
6841 desc
, mdname(mddev
));
6842 mddev
->curr_resync
= j
;
6844 mddev
->curr_resync_completed
= mddev
->curr_resync
;
6846 while (j
< max_sectors
) {
6851 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6852 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6853 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6854 > (max_sectors
>> 4)) ||
6855 (j
- mddev
->curr_resync_completed
)*2
6856 >= mddev
->resync_max
- mddev
->curr_resync_completed
6858 /* time to update curr_resync_completed */
6860 wait_event(mddev
->recovery_wait
,
6861 atomic_read(&mddev
->recovery_active
) == 0);
6862 mddev
->curr_resync_completed
=
6864 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6865 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6868 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6869 /* As this condition is controlled by user-space,
6870 * we can block indefinitely, so use '_interruptible'
6871 * to avoid triggering warnings.
6873 flush_signals(current
); /* just in case */
6874 wait_event_interruptible(mddev
->recovery_wait
,
6875 mddev
->resync_max
> j
6876 || kthread_should_stop());
6879 if (kthread_should_stop())
6882 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6883 currspeed
< speed_min(mddev
));
6885 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6889 if (!skipped
) { /* actual IO requested */
6890 io_sectors
+= sectors
;
6891 atomic_add(sectors
, &mddev
->recovery_active
);
6895 if (j
>1) mddev
->curr_resync
= j
;
6896 mddev
->curr_mark_cnt
= io_sectors
;
6897 if (last_check
== 0)
6898 /* this is the earliers that rebuilt will be
6899 * visible in /proc/mdstat
6901 md_new_event(mddev
);
6903 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6906 last_check
= io_sectors
;
6908 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6912 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6914 int next
= (last_mark
+1) % SYNC_MARKS
;
6916 mddev
->resync_mark
= mark
[next
];
6917 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6918 mark
[next
] = jiffies
;
6919 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6924 if (kthread_should_stop())
6929 * this loop exits only if either when we are slower than
6930 * the 'hard' speed limit, or the system was IO-idle for
6932 * the system might be non-idle CPU-wise, but we only care
6933 * about not overloading the IO subsystem. (things like an
6934 * e2fsck being done on the RAID array should execute fast)
6939 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6940 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6942 if (currspeed
> speed_min(mddev
)) {
6943 if ((currspeed
> speed_max(mddev
)) ||
6944 !is_mddev_idle(mddev
, 0)) {
6950 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6952 * this also signals 'finished resyncing' to md_stop
6957 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6959 /* tell personality that we are finished */
6960 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6962 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6963 mddev
->curr_resync
> 2) {
6964 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6965 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6966 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6968 "md: checkpointing %s of %s.\n",
6969 desc
, mdname(mddev
));
6970 mddev
->recovery_cp
= mddev
->curr_resync
;
6973 mddev
->recovery_cp
= MaxSector
;
6975 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6976 mddev
->curr_resync
= MaxSector
;
6978 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6979 if (rdev
->raid_disk
>= 0 &&
6980 mddev
->delta_disks
>= 0 &&
6981 !test_bit(Faulty
, &rdev
->flags
) &&
6982 !test_bit(In_sync
, &rdev
->flags
) &&
6983 rdev
->recovery_offset
< mddev
->curr_resync
)
6984 rdev
->recovery_offset
= mddev
->curr_resync
;
6988 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6991 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6992 /* We completed so min/max setting can be forgotten if used. */
6993 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6994 mddev
->resync_min
= 0;
6995 mddev
->resync_max
= MaxSector
;
6996 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6997 mddev
->resync_min
= mddev
->curr_resync_completed
;
6998 mddev
->curr_resync
= 0;
6999 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7000 mddev
->curr_resync_completed
= 0;
7001 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7002 wake_up(&resync_wait
);
7003 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7004 md_wakeup_thread(mddev
->thread
);
7009 * got a signal, exit.
7012 "md: md_do_sync() got signal ... exiting\n");
7013 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7017 EXPORT_SYMBOL_GPL(md_do_sync
);
7020 static int remove_and_add_spares(mddev_t
*mddev
)
7025 mddev
->curr_resync_completed
= 0;
7027 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7028 if (rdev
->raid_disk
>= 0 &&
7029 !test_bit(Blocked
, &rdev
->flags
) &&
7030 (test_bit(Faulty
, &rdev
->flags
) ||
7031 ! test_bit(In_sync
, &rdev
->flags
)) &&
7032 atomic_read(&rdev
->nr_pending
)==0) {
7033 if (mddev
->pers
->hot_remove_disk(
7034 mddev
, rdev
->raid_disk
)==0) {
7036 sprintf(nm
,"rd%d", rdev
->raid_disk
);
7037 sysfs_remove_link(&mddev
->kobj
, nm
);
7038 rdev
->raid_disk
= -1;
7042 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
7043 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7044 if (rdev
->raid_disk
>= 0 &&
7045 !test_bit(In_sync
, &rdev
->flags
) &&
7046 !test_bit(Blocked
, &rdev
->flags
))
7048 if (rdev
->raid_disk
< 0
7049 && !test_bit(Faulty
, &rdev
->flags
)) {
7050 rdev
->recovery_offset
= 0;
7052 hot_add_disk(mddev
, rdev
) == 0) {
7054 sprintf(nm
, "rd%d", rdev
->raid_disk
);
7055 if (sysfs_create_link(&mddev
->kobj
,
7057 /* failure here is OK */;
7059 md_new_event(mddev
);
7060 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7069 * This routine is regularly called by all per-raid-array threads to
7070 * deal with generic issues like resync and super-block update.
7071 * Raid personalities that don't have a thread (linear/raid0) do not
7072 * need this as they never do any recovery or update the superblock.
7074 * It does not do any resync itself, but rather "forks" off other threads
7075 * to do that as needed.
7076 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7077 * "->recovery" and create a thread at ->sync_thread.
7078 * When the thread finishes it sets MD_RECOVERY_DONE
7079 * and wakeups up this thread which will reap the thread and finish up.
7080 * This thread also removes any faulty devices (with nr_pending == 0).
7082 * The overall approach is:
7083 * 1/ if the superblock needs updating, update it.
7084 * 2/ If a recovery thread is running, don't do anything else.
7085 * 3/ If recovery has finished, clean up, possibly marking spares active.
7086 * 4/ If there are any faulty devices, remove them.
7087 * 5/ If array is degraded, try to add spares devices
7088 * 6/ If array has spares or is not in-sync, start a resync thread.
7090 void md_check_recovery(mddev_t
*mddev
)
7096 bitmap_daemon_work(mddev
);
7101 if (signal_pending(current
)) {
7102 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7103 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7105 mddev
->safemode
= 2;
7107 flush_signals(current
);
7110 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7113 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7114 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7115 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7116 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7117 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7118 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7122 if (mddev_trylock(mddev
)) {
7126 /* Only thing we do on a ro array is remove
7129 remove_and_add_spares(mddev
);
7130 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7134 if (!mddev
->external
) {
7136 spin_lock_irq(&mddev
->write_lock
);
7137 if (mddev
->safemode
&&
7138 !atomic_read(&mddev
->writes_pending
) &&
7140 mddev
->recovery_cp
== MaxSector
) {
7143 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7145 if (mddev
->safemode
== 1)
7146 mddev
->safemode
= 0;
7147 spin_unlock_irq(&mddev
->write_lock
);
7149 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7153 md_update_sb(mddev
, 0);
7155 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7156 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7157 /* resync/recovery still happening */
7158 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7161 if (mddev
->sync_thread
) {
7162 /* resync has finished, collect result */
7163 md_unregister_thread(mddev
->sync_thread
);
7164 mddev
->sync_thread
= NULL
;
7165 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7166 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7168 /* activate any spares */
7169 if (mddev
->pers
->spare_active(mddev
))
7170 sysfs_notify(&mddev
->kobj
, NULL
,
7173 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7174 mddev
->pers
->finish_reshape
)
7175 mddev
->pers
->finish_reshape(mddev
);
7176 md_update_sb(mddev
, 1);
7178 /* if array is no-longer degraded, then any saved_raid_disk
7179 * information must be scrapped
7181 if (!mddev
->degraded
)
7182 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7183 rdev
->saved_raid_disk
= -1;
7185 mddev
->recovery
= 0;
7186 /* flag recovery needed just to double check */
7187 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7188 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7189 md_new_event(mddev
);
7192 /* Set RUNNING before clearing NEEDED to avoid
7193 * any transients in the value of "sync_action".
7195 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7196 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7197 /* Clear some bits that don't mean anything, but
7200 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7201 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7203 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7205 /* no recovery is running.
7206 * remove any failed drives, then
7207 * add spares if possible.
7208 * Spare are also removed and re-added, to allow
7209 * the personality to fail the re-add.
7212 if (mddev
->reshape_position
!= MaxSector
) {
7213 if (mddev
->pers
->check_reshape
== NULL
||
7214 mddev
->pers
->check_reshape(mddev
) != 0)
7215 /* Cannot proceed */
7217 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7218 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7219 } else if ((spares
= remove_and_add_spares(mddev
))) {
7220 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7221 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7222 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7223 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7224 } else if (mddev
->recovery_cp
< MaxSector
) {
7225 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7226 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7227 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7228 /* nothing to be done ... */
7231 if (mddev
->pers
->sync_request
) {
7232 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7233 /* We are adding a device or devices to an array
7234 * which has the bitmap stored on all devices.
7235 * So make sure all bitmap pages get written
7237 bitmap_write_all(mddev
->bitmap
);
7239 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7242 if (!mddev
->sync_thread
) {
7243 printk(KERN_ERR
"%s: could not start resync"
7246 /* leave the spares where they are, it shouldn't hurt */
7247 mddev
->recovery
= 0;
7249 md_wakeup_thread(mddev
->sync_thread
);
7250 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7251 md_new_event(mddev
);
7254 if (!mddev
->sync_thread
) {
7255 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7256 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7258 if (mddev
->sysfs_action
)
7259 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7261 mddev_unlock(mddev
);
7265 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7267 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7268 wait_event_timeout(rdev
->blocked_wait
,
7269 !test_bit(Blocked
, &rdev
->flags
),
7270 msecs_to_jiffies(5000));
7271 rdev_dec_pending(rdev
, mddev
);
7273 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7275 static int md_notify_reboot(struct notifier_block
*this,
7276 unsigned long code
, void *x
)
7278 struct list_head
*tmp
;
7281 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7283 printk(KERN_INFO
"md: stopping all md devices.\n");
7285 for_each_mddev(mddev
, tmp
)
7286 if (mddev_trylock(mddev
)) {
7287 /* Force a switch to readonly even array
7288 * appears to still be in use. Hence
7291 md_set_readonly(mddev
, 100);
7292 mddev_unlock(mddev
);
7295 * certain more exotic SCSI devices are known to be
7296 * volatile wrt too early system reboots. While the
7297 * right place to handle this issue is the given
7298 * driver, we do want to have a safe RAID driver ...
7305 static struct notifier_block md_notifier
= {
7306 .notifier_call
= md_notify_reboot
,
7308 .priority
= INT_MAX
, /* before any real devices */
7311 static void md_geninit(void)
7313 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7315 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7318 static int __init
md_init(void)
7322 md_wq
= alloc_workqueue("md", WQ_RESCUER
, 0);
7326 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
7330 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
7333 if ((ret
= register_blkdev(0, "mdp")) < 0)
7337 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7338 md_probe
, NULL
, NULL
);
7339 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7340 md_probe
, NULL
, NULL
);
7342 register_reboot_notifier(&md_notifier
);
7343 raid_table_header
= register_sysctl_table(raid_root_table
);
7349 unregister_blkdev(MD_MAJOR
, "md");
7351 destroy_workqueue(md_misc_wq
);
7353 destroy_workqueue(md_wq
);
7361 * Searches all registered partitions for autorun RAID arrays
7365 static LIST_HEAD(all_detected_devices
);
7366 struct detected_devices_node
{
7367 struct list_head list
;
7371 void md_autodetect_dev(dev_t dev
)
7373 struct detected_devices_node
*node_detected_dev
;
7375 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7376 if (node_detected_dev
) {
7377 node_detected_dev
->dev
= dev
;
7378 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7380 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7381 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7386 static void autostart_arrays(int part
)
7389 struct detected_devices_node
*node_detected_dev
;
7391 int i_scanned
, i_passed
;
7396 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7398 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7400 node_detected_dev
= list_entry(all_detected_devices
.next
,
7401 struct detected_devices_node
, list
);
7402 list_del(&node_detected_dev
->list
);
7403 dev
= node_detected_dev
->dev
;
7404 kfree(node_detected_dev
);
7405 rdev
= md_import_device(dev
,0, 90);
7409 if (test_bit(Faulty
, &rdev
->flags
)) {
7413 set_bit(AutoDetected
, &rdev
->flags
);
7414 list_add(&rdev
->same_set
, &pending_raid_disks
);
7418 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7419 i_scanned
, i_passed
);
7421 autorun_devices(part
);
7424 #endif /* !MODULE */
7426 static __exit
void md_exit(void)
7429 struct list_head
*tmp
;
7431 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7432 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7434 unregister_blkdev(MD_MAJOR
,"md");
7435 unregister_blkdev(mdp_major
, "mdp");
7436 unregister_reboot_notifier(&md_notifier
);
7437 unregister_sysctl_table(raid_table_header
);
7438 remove_proc_entry("mdstat", NULL
);
7439 for_each_mddev(mddev
, tmp
) {
7440 export_array(mddev
);
7441 mddev
->hold_active
= 0;
7443 destroy_workqueue(md_misc_wq
);
7444 destroy_workqueue(md_wq
);
7447 subsys_initcall(md_init
);
7448 module_exit(md_exit
)
7450 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7452 return sprintf(buffer
, "%d", start_readonly
);
7454 static int set_ro(const char *val
, struct kernel_param
*kp
)
7457 int num
= simple_strtoul(val
, &e
, 10);
7458 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7459 start_readonly
= num
;
7465 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7466 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7468 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7470 EXPORT_SYMBOL(register_md_personality
);
7471 EXPORT_SYMBOL(unregister_md_personality
);
7472 EXPORT_SYMBOL(md_error
);
7473 EXPORT_SYMBOL(md_done_sync
);
7474 EXPORT_SYMBOL(md_write_start
);
7475 EXPORT_SYMBOL(md_write_end
);
7476 EXPORT_SYMBOL(md_register_thread
);
7477 EXPORT_SYMBOL(md_unregister_thread
);
7478 EXPORT_SYMBOL(md_wakeup_thread
);
7479 EXPORT_SYMBOL(md_check_recovery
);
7480 MODULE_LICENSE("GPL");
7481 MODULE_DESCRIPTION("MD RAID framework");
7483 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);