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
;
291 if (mddev
== NULL
|| mddev
->pers
== NULL
296 smp_rmb(); /* Ensure implications of 'active' are visible */
298 if (mddev
->suspended
) {
301 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
302 TASK_UNINTERRUPTIBLE
);
303 if (!mddev
->suspended
)
309 finish_wait(&mddev
->sb_wait
, &__wait
);
311 atomic_inc(&mddev
->active_io
);
314 rv
= mddev
->pers
->make_request(mddev
, bio
);
316 cpu
= part_stat_lock();
317 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
318 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
],
322 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
323 wake_up(&mddev
->sb_wait
);
328 /* mddev_suspend makes sure no new requests are submitted
329 * to the device, and that any requests that have been submitted
330 * are completely handled.
331 * Once ->stop is called and completes, the module will be completely
334 void mddev_suspend(mddev_t
*mddev
)
336 BUG_ON(mddev
->suspended
);
337 mddev
->suspended
= 1;
339 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
340 mddev
->pers
->quiesce(mddev
, 1);
342 EXPORT_SYMBOL_GPL(mddev_suspend
);
344 void mddev_resume(mddev_t
*mddev
)
346 mddev
->suspended
= 0;
347 wake_up(&mddev
->sb_wait
);
348 mddev
->pers
->quiesce(mddev
, 0);
350 EXPORT_SYMBOL_GPL(mddev_resume
);
352 int mddev_congested(mddev_t
*mddev
, int bits
)
354 return mddev
->suspended
;
356 EXPORT_SYMBOL(mddev_congested
);
359 * Generic flush handling for md
362 static void md_end_flush(struct bio
*bio
, int err
)
364 mdk_rdev_t
*rdev
= bio
->bi_private
;
365 mddev_t
*mddev
= rdev
->mddev
;
367 rdev_dec_pending(rdev
, mddev
);
369 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
370 /* The pre-request flush has finished */
371 queue_work(md_wq
, &mddev
->flush_work
);
376 static void md_submit_flush_data(struct work_struct
*ws
);
378 static void submit_flushes(struct work_struct
*ws
)
380 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
383 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
384 atomic_set(&mddev
->flush_pending
, 1);
386 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
387 if (rdev
->raid_disk
>= 0 &&
388 !test_bit(Faulty
, &rdev
->flags
)) {
389 /* Take two references, one is dropped
390 * when request finishes, one after
391 * we reclaim rcu_read_lock
394 atomic_inc(&rdev
->nr_pending
);
395 atomic_inc(&rdev
->nr_pending
);
397 bi
= bio_alloc_mddev(GFP_KERNEL
, 0, mddev
);
398 bi
->bi_end_io
= md_end_flush
;
399 bi
->bi_private
= rdev
;
400 bi
->bi_bdev
= rdev
->bdev
;
401 atomic_inc(&mddev
->flush_pending
);
402 submit_bio(WRITE_FLUSH
, bi
);
404 rdev_dec_pending(rdev
, mddev
);
407 if (atomic_dec_and_test(&mddev
->flush_pending
))
408 queue_work(md_wq
, &mddev
->flush_work
);
411 static void md_submit_flush_data(struct work_struct
*ws
)
413 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
414 struct bio
*bio
= mddev
->flush_bio
;
416 if (bio
->bi_size
== 0)
417 /* an empty barrier - all done */
420 bio
->bi_rw
&= ~REQ_FLUSH
;
421 if (mddev
->pers
->make_request(mddev
, bio
))
422 generic_make_request(bio
);
425 mddev
->flush_bio
= NULL
;
426 wake_up(&mddev
->sb_wait
);
429 void md_flush_request(mddev_t
*mddev
, struct bio
*bio
)
431 spin_lock_irq(&mddev
->write_lock
);
432 wait_event_lock_irq(mddev
->sb_wait
,
434 mddev
->write_lock
, /*nothing*/);
435 mddev
->flush_bio
= bio
;
436 spin_unlock_irq(&mddev
->write_lock
);
438 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
439 queue_work(md_wq
, &mddev
->flush_work
);
441 EXPORT_SYMBOL(md_flush_request
);
443 /* Support for plugging.
444 * This mirrors the plugging support in request_queue, but does not
445 * require having a whole queue
447 static void plugger_work(struct work_struct
*work
)
449 struct plug_handle
*plug
=
450 container_of(work
, struct plug_handle
, unplug_work
);
451 plug
->unplug_fn(plug
);
453 static void plugger_timeout(unsigned long data
)
455 struct plug_handle
*plug
= (void *)data
;
456 kblockd_schedule_work(NULL
, &plug
->unplug_work
);
458 void plugger_init(struct plug_handle
*plug
,
459 void (*unplug_fn
)(struct plug_handle
*))
461 plug
->unplug_flag
= 0;
462 plug
->unplug_fn
= unplug_fn
;
463 init_timer(&plug
->unplug_timer
);
464 plug
->unplug_timer
.function
= plugger_timeout
;
465 plug
->unplug_timer
.data
= (unsigned long)plug
;
466 INIT_WORK(&plug
->unplug_work
, plugger_work
);
468 EXPORT_SYMBOL_GPL(plugger_init
);
470 void plugger_set_plug(struct plug_handle
*plug
)
472 if (!test_and_set_bit(PLUGGED_FLAG
, &plug
->unplug_flag
))
473 mod_timer(&plug
->unplug_timer
, jiffies
+ msecs_to_jiffies(3)+1);
475 EXPORT_SYMBOL_GPL(plugger_set_plug
);
477 int plugger_remove_plug(struct plug_handle
*plug
)
479 if (test_and_clear_bit(PLUGGED_FLAG
, &plug
->unplug_flag
)) {
480 del_timer(&plug
->unplug_timer
);
485 EXPORT_SYMBOL_GPL(plugger_remove_plug
);
488 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
490 atomic_inc(&mddev
->active
);
494 static void mddev_delayed_delete(struct work_struct
*ws
);
496 static void mddev_put(mddev_t
*mddev
)
498 struct bio_set
*bs
= NULL
;
500 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
502 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
503 mddev
->ctime
== 0 && !mddev
->hold_active
) {
504 /* Array is not configured at all, and not held active,
506 list_del(&mddev
->all_mddevs
);
508 mddev
->bio_set
= NULL
;
509 if (mddev
->gendisk
) {
510 /* We did a probe so need to clean up. Call
511 * queue_work inside the spinlock so that
512 * flush_workqueue() after mddev_find will
513 * succeed in waiting for the work to be done.
515 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
516 queue_work(md_misc_wq
, &mddev
->del_work
);
520 spin_unlock(&all_mddevs_lock
);
525 void mddev_init(mddev_t
*mddev
)
527 mutex_init(&mddev
->open_mutex
);
528 mutex_init(&mddev
->reconfig_mutex
);
529 mutex_init(&mddev
->bitmap_info
.mutex
);
530 INIT_LIST_HEAD(&mddev
->disks
);
531 INIT_LIST_HEAD(&mddev
->all_mddevs
);
532 init_timer(&mddev
->safemode_timer
);
533 atomic_set(&mddev
->active
, 1);
534 atomic_set(&mddev
->openers
, 0);
535 atomic_set(&mddev
->active_io
, 0);
536 spin_lock_init(&mddev
->write_lock
);
537 atomic_set(&mddev
->flush_pending
, 0);
538 init_waitqueue_head(&mddev
->sb_wait
);
539 init_waitqueue_head(&mddev
->recovery_wait
);
540 mddev
->reshape_position
= MaxSector
;
541 mddev
->resync_min
= 0;
542 mddev
->resync_max
= MaxSector
;
543 mddev
->level
= LEVEL_NONE
;
545 EXPORT_SYMBOL_GPL(mddev_init
);
547 static mddev_t
* mddev_find(dev_t unit
)
549 mddev_t
*mddev
, *new = NULL
;
552 spin_lock(&all_mddevs_lock
);
555 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
556 if (mddev
->unit
== unit
) {
558 spin_unlock(&all_mddevs_lock
);
564 list_add(&new->all_mddevs
, &all_mddevs
);
565 spin_unlock(&all_mddevs_lock
);
566 new->hold_active
= UNTIL_IOCTL
;
570 /* find an unused unit number */
571 static int next_minor
= 512;
572 int start
= next_minor
;
576 dev
= MKDEV(MD_MAJOR
, next_minor
);
578 if (next_minor
> MINORMASK
)
580 if (next_minor
== start
) {
581 /* Oh dear, all in use. */
582 spin_unlock(&all_mddevs_lock
);
588 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
589 if (mddev
->unit
== dev
) {
595 new->md_minor
= MINOR(dev
);
596 new->hold_active
= UNTIL_STOP
;
597 list_add(&new->all_mddevs
, &all_mddevs
);
598 spin_unlock(&all_mddevs_lock
);
601 spin_unlock(&all_mddevs_lock
);
603 new = kzalloc(sizeof(*new), GFP_KERNEL
);
608 if (MAJOR(unit
) == MD_MAJOR
)
609 new->md_minor
= MINOR(unit
);
611 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
618 static inline int mddev_lock(mddev_t
* mddev
)
620 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
623 static inline int mddev_is_locked(mddev_t
*mddev
)
625 return mutex_is_locked(&mddev
->reconfig_mutex
);
628 static inline int mddev_trylock(mddev_t
* mddev
)
630 return mutex_trylock(&mddev
->reconfig_mutex
);
633 static struct attribute_group md_redundancy_group
;
635 static void mddev_unlock(mddev_t
* mddev
)
637 if (mddev
->to_remove
) {
638 /* These cannot be removed under reconfig_mutex as
639 * an access to the files will try to take reconfig_mutex
640 * while holding the file unremovable, which leads to
642 * So hold set sysfs_active while the remove in happeing,
643 * and anything else which might set ->to_remove or my
644 * otherwise change the sysfs namespace will fail with
645 * -EBUSY if sysfs_active is still set.
646 * We set sysfs_active under reconfig_mutex and elsewhere
647 * test it under the same mutex to ensure its correct value
650 struct attribute_group
*to_remove
= mddev
->to_remove
;
651 mddev
->to_remove
= NULL
;
652 mddev
->sysfs_active
= 1;
653 mutex_unlock(&mddev
->reconfig_mutex
);
655 if (mddev
->kobj
.sd
) {
656 if (to_remove
!= &md_redundancy_group
)
657 sysfs_remove_group(&mddev
->kobj
, to_remove
);
658 if (mddev
->pers
== NULL
||
659 mddev
->pers
->sync_request
== NULL
) {
660 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
661 if (mddev
->sysfs_action
)
662 sysfs_put(mddev
->sysfs_action
);
663 mddev
->sysfs_action
= NULL
;
666 mddev
->sysfs_active
= 0;
668 mutex_unlock(&mddev
->reconfig_mutex
);
670 md_wakeup_thread(mddev
->thread
);
673 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
677 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
678 if (rdev
->desc_nr
== nr
)
684 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
688 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
689 if (rdev
->bdev
->bd_dev
== dev
)
695 static struct mdk_personality
*find_pers(int level
, char *clevel
)
697 struct mdk_personality
*pers
;
698 list_for_each_entry(pers
, &pers_list
, list
) {
699 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
701 if (strcmp(pers
->name
, clevel
)==0)
707 /* return the offset of the super block in 512byte sectors */
708 static inline sector_t
calc_dev_sboffset(mdk_rdev_t
*rdev
)
710 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
711 return MD_NEW_SIZE_SECTORS(num_sectors
);
714 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
719 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
720 if (!rdev
->sb_page
) {
721 printk(KERN_ALERT
"md: out of memory.\n");
728 static void free_disk_sb(mdk_rdev_t
* rdev
)
731 put_page(rdev
->sb_page
);
733 rdev
->sb_page
= NULL
;
740 static void super_written(struct bio
*bio
, int error
)
742 mdk_rdev_t
*rdev
= bio
->bi_private
;
743 mddev_t
*mddev
= rdev
->mddev
;
745 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
746 printk("md: super_written gets error=%d, uptodate=%d\n",
747 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
748 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
749 md_error(mddev
, rdev
);
752 if (atomic_dec_and_test(&mddev
->pending_writes
))
753 wake_up(&mddev
->sb_wait
);
757 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
758 sector_t sector
, int size
, struct page
*page
)
760 /* write first size bytes of page to sector of rdev
761 * Increment mddev->pending_writes before returning
762 * and decrement it on completion, waking up sb_wait
763 * if zero is reached.
764 * If an error occurred, call md_error
766 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
768 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
769 bio
->bi_sector
= sector
;
770 bio_add_page(bio
, page
, size
, 0);
771 bio
->bi_private
= rdev
;
772 bio
->bi_end_io
= super_written
;
774 atomic_inc(&mddev
->pending_writes
);
775 submit_bio(REQ_WRITE
| REQ_SYNC
| REQ_UNPLUG
| REQ_FLUSH
| REQ_FUA
,
779 void md_super_wait(mddev_t
*mddev
)
781 /* wait for all superblock writes that were scheduled to complete */
784 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
785 if (atomic_read(&mddev
->pending_writes
)==0)
789 finish_wait(&mddev
->sb_wait
, &wq
);
792 static void bi_complete(struct bio
*bio
, int error
)
794 complete((struct completion
*)bio
->bi_private
);
797 int sync_page_io(mdk_rdev_t
*rdev
, sector_t sector
, int size
,
798 struct page
*page
, int rw
, bool metadata_op
)
800 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
801 struct completion event
;
804 rw
|= REQ_SYNC
| REQ_UNPLUG
;
806 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
807 rdev
->meta_bdev
: rdev
->bdev
;
809 bio
->bi_sector
= sector
+ rdev
->sb_start
;
811 bio
->bi_sector
= sector
+ rdev
->data_offset
;
812 bio_add_page(bio
, page
, size
, 0);
813 init_completion(&event
);
814 bio
->bi_private
= &event
;
815 bio
->bi_end_io
= bi_complete
;
817 wait_for_completion(&event
);
819 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
823 EXPORT_SYMBOL_GPL(sync_page_io
);
825 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
827 char b
[BDEVNAME_SIZE
];
828 if (!rdev
->sb_page
) {
836 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
842 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
843 bdevname(rdev
->bdev
,b
));
847 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
849 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
850 sb1
->set_uuid1
== sb2
->set_uuid1
&&
851 sb1
->set_uuid2
== sb2
->set_uuid2
&&
852 sb1
->set_uuid3
== sb2
->set_uuid3
;
855 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
858 mdp_super_t
*tmp1
, *tmp2
;
860 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
861 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
863 if (!tmp1
|| !tmp2
) {
865 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
873 * nr_disks is not constant
878 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
886 static u32
md_csum_fold(u32 csum
)
888 csum
= (csum
& 0xffff) + (csum
>> 16);
889 return (csum
& 0xffff) + (csum
>> 16);
892 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
895 u32
*sb32
= (u32
*)sb
;
897 unsigned int disk_csum
, csum
;
899 disk_csum
= sb
->sb_csum
;
902 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
904 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
908 /* This used to use csum_partial, which was wrong for several
909 * reasons including that different results are returned on
910 * different architectures. It isn't critical that we get exactly
911 * the same return value as before (we always csum_fold before
912 * testing, and that removes any differences). However as we
913 * know that csum_partial always returned a 16bit value on
914 * alphas, do a fold to maximise conformity to previous behaviour.
916 sb
->sb_csum
= md_csum_fold(disk_csum
);
918 sb
->sb_csum
= disk_csum
;
925 * Handle superblock details.
926 * We want to be able to handle multiple superblock formats
927 * so we have a common interface to them all, and an array of
928 * different handlers.
929 * We rely on user-space to write the initial superblock, and support
930 * reading and updating of superblocks.
931 * Interface methods are:
932 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
933 * loads and validates a superblock on dev.
934 * if refdev != NULL, compare superblocks on both devices
936 * 0 - dev has a superblock that is compatible with refdev
937 * 1 - dev has a superblock that is compatible and newer than refdev
938 * so dev should be used as the refdev in future
939 * -EINVAL superblock incompatible or invalid
940 * -othererror e.g. -EIO
942 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
943 * Verify that dev is acceptable into mddev.
944 * The first time, mddev->raid_disks will be 0, and data from
945 * dev should be merged in. Subsequent calls check that dev
946 * is new enough. Return 0 or -EINVAL
948 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
949 * Update the superblock for rdev with data in mddev
950 * This does not write to disc.
956 struct module
*owner
;
957 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
959 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
960 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
961 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
962 sector_t num_sectors
);
966 * Check that the given mddev has no bitmap.
968 * This function is called from the run method of all personalities that do not
969 * support bitmaps. It prints an error message and returns non-zero if mddev
970 * has a bitmap. Otherwise, it returns 0.
973 int md_check_no_bitmap(mddev_t
*mddev
)
975 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
977 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
978 mdname(mddev
), mddev
->pers
->name
);
981 EXPORT_SYMBOL(md_check_no_bitmap
);
984 * load_super for 0.90.0
986 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
988 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
993 * Calculate the position of the superblock (512byte sectors),
994 * it's at the end of the disk.
996 * It also happens to be a multiple of 4Kb.
998 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1000 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1001 if (ret
) return ret
;
1005 bdevname(rdev
->bdev
, b
);
1006 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1008 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1009 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1014 if (sb
->major_version
!= 0 ||
1015 sb
->minor_version
< 90 ||
1016 sb
->minor_version
> 91) {
1017 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1018 sb
->major_version
, sb
->minor_version
,
1023 if (sb
->raid_disks
<= 0)
1026 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1027 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1032 rdev
->preferred_minor
= sb
->md_minor
;
1033 rdev
->data_offset
= 0;
1034 rdev
->sb_size
= MD_SB_BYTES
;
1036 if (sb
->level
== LEVEL_MULTIPATH
)
1039 rdev
->desc_nr
= sb
->this_disk
.number
;
1045 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
1046 if (!uuid_equal(refsb
, sb
)) {
1047 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1048 b
, bdevname(refdev
->bdev
,b2
));
1051 if (!sb_equal(refsb
, sb
)) {
1052 printk(KERN_WARNING
"md: %s has same UUID"
1053 " but different superblock to %s\n",
1054 b
, bdevname(refdev
->bdev
, b2
));
1058 ev2
= md_event(refsb
);
1064 rdev
->sectors
= rdev
->sb_start
;
1066 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
1067 /* "this cannot possibly happen" ... */
1075 * validate_super for 0.90.0
1077 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1080 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1081 __u64 ev1
= md_event(sb
);
1083 rdev
->raid_disk
= -1;
1084 clear_bit(Faulty
, &rdev
->flags
);
1085 clear_bit(In_sync
, &rdev
->flags
);
1086 clear_bit(WriteMostly
, &rdev
->flags
);
1088 if (mddev
->raid_disks
== 0) {
1089 mddev
->major_version
= 0;
1090 mddev
->minor_version
= sb
->minor_version
;
1091 mddev
->patch_version
= sb
->patch_version
;
1092 mddev
->external
= 0;
1093 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1094 mddev
->ctime
= sb
->ctime
;
1095 mddev
->utime
= sb
->utime
;
1096 mddev
->level
= sb
->level
;
1097 mddev
->clevel
[0] = 0;
1098 mddev
->layout
= sb
->layout
;
1099 mddev
->raid_disks
= sb
->raid_disks
;
1100 mddev
->dev_sectors
= sb
->size
* 2;
1101 mddev
->events
= ev1
;
1102 mddev
->bitmap_info
.offset
= 0;
1103 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1105 if (mddev
->minor_version
>= 91) {
1106 mddev
->reshape_position
= sb
->reshape_position
;
1107 mddev
->delta_disks
= sb
->delta_disks
;
1108 mddev
->new_level
= sb
->new_level
;
1109 mddev
->new_layout
= sb
->new_layout
;
1110 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1112 mddev
->reshape_position
= MaxSector
;
1113 mddev
->delta_disks
= 0;
1114 mddev
->new_level
= mddev
->level
;
1115 mddev
->new_layout
= mddev
->layout
;
1116 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1119 if (sb
->state
& (1<<MD_SB_CLEAN
))
1120 mddev
->recovery_cp
= MaxSector
;
1122 if (sb
->events_hi
== sb
->cp_events_hi
&&
1123 sb
->events_lo
== sb
->cp_events_lo
) {
1124 mddev
->recovery_cp
= sb
->recovery_cp
;
1126 mddev
->recovery_cp
= 0;
1129 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1130 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1131 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1132 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1134 mddev
->max_disks
= MD_SB_DISKS
;
1136 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1137 mddev
->bitmap_info
.file
== NULL
)
1138 mddev
->bitmap_info
.offset
=
1139 mddev
->bitmap_info
.default_offset
;
1141 } else if (mddev
->pers
== NULL
) {
1142 /* Insist on good event counter while assembling, except
1143 * for spares (which don't need an event count) */
1145 if (sb
->disks
[rdev
->desc_nr
].state
& (
1146 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1147 if (ev1
< mddev
->events
)
1149 } else if (mddev
->bitmap
) {
1150 /* if adding to array with a bitmap, then we can accept an
1151 * older device ... but not too old.
1153 if (ev1
< mddev
->bitmap
->events_cleared
)
1156 if (ev1
< mddev
->events
)
1157 /* just a hot-add of a new device, leave raid_disk at -1 */
1161 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1162 desc
= sb
->disks
+ rdev
->desc_nr
;
1164 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1165 set_bit(Faulty
, &rdev
->flags
);
1166 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1167 desc->raid_disk < mddev->raid_disks */) {
1168 set_bit(In_sync
, &rdev
->flags
);
1169 rdev
->raid_disk
= desc
->raid_disk
;
1170 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1171 /* active but not in sync implies recovery up to
1172 * reshape position. We don't know exactly where
1173 * that is, so set to zero for now */
1174 if (mddev
->minor_version
>= 91) {
1175 rdev
->recovery_offset
= 0;
1176 rdev
->raid_disk
= desc
->raid_disk
;
1179 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1180 set_bit(WriteMostly
, &rdev
->flags
);
1181 } else /* MULTIPATH are always insync */
1182 set_bit(In_sync
, &rdev
->flags
);
1187 * sync_super for 0.90.0
1189 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1193 int next_spare
= mddev
->raid_disks
;
1196 /* make rdev->sb match mddev data..
1199 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1200 * 3/ any empty disks < next_spare become removed
1202 * disks[0] gets initialised to REMOVED because
1203 * we cannot be sure from other fields if it has
1204 * been initialised or not.
1207 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1209 rdev
->sb_size
= MD_SB_BYTES
;
1211 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1213 memset(sb
, 0, sizeof(*sb
));
1215 sb
->md_magic
= MD_SB_MAGIC
;
1216 sb
->major_version
= mddev
->major_version
;
1217 sb
->patch_version
= mddev
->patch_version
;
1218 sb
->gvalid_words
= 0; /* ignored */
1219 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1220 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1221 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1222 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1224 sb
->ctime
= mddev
->ctime
;
1225 sb
->level
= mddev
->level
;
1226 sb
->size
= mddev
->dev_sectors
/ 2;
1227 sb
->raid_disks
= mddev
->raid_disks
;
1228 sb
->md_minor
= mddev
->md_minor
;
1229 sb
->not_persistent
= 0;
1230 sb
->utime
= mddev
->utime
;
1232 sb
->events_hi
= (mddev
->events
>>32);
1233 sb
->events_lo
= (u32
)mddev
->events
;
1235 if (mddev
->reshape_position
== MaxSector
)
1236 sb
->minor_version
= 90;
1238 sb
->minor_version
= 91;
1239 sb
->reshape_position
= mddev
->reshape_position
;
1240 sb
->new_level
= mddev
->new_level
;
1241 sb
->delta_disks
= mddev
->delta_disks
;
1242 sb
->new_layout
= mddev
->new_layout
;
1243 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1245 mddev
->minor_version
= sb
->minor_version
;
1248 sb
->recovery_cp
= mddev
->recovery_cp
;
1249 sb
->cp_events_hi
= (mddev
->events
>>32);
1250 sb
->cp_events_lo
= (u32
)mddev
->events
;
1251 if (mddev
->recovery_cp
== MaxSector
)
1252 sb
->state
= (1<< MD_SB_CLEAN
);
1254 sb
->recovery_cp
= 0;
1256 sb
->layout
= mddev
->layout
;
1257 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1259 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1260 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1262 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1263 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1266 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1268 if (rdev2
->raid_disk
>= 0 &&
1269 sb
->minor_version
>= 91)
1270 /* we have nowhere to store the recovery_offset,
1271 * but if it is not below the reshape_position,
1272 * we can piggy-back on that.
1275 if (rdev2
->raid_disk
< 0 ||
1276 test_bit(Faulty
, &rdev2
->flags
))
1279 desc_nr
= rdev2
->raid_disk
;
1281 desc_nr
= next_spare
++;
1282 rdev2
->desc_nr
= desc_nr
;
1283 d
= &sb
->disks
[rdev2
->desc_nr
];
1285 d
->number
= rdev2
->desc_nr
;
1286 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1287 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1289 d
->raid_disk
= rdev2
->raid_disk
;
1291 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1292 if (test_bit(Faulty
, &rdev2
->flags
))
1293 d
->state
= (1<<MD_DISK_FAULTY
);
1294 else if (is_active
) {
1295 d
->state
= (1<<MD_DISK_ACTIVE
);
1296 if (test_bit(In_sync
, &rdev2
->flags
))
1297 d
->state
|= (1<<MD_DISK_SYNC
);
1305 if (test_bit(WriteMostly
, &rdev2
->flags
))
1306 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1308 /* now set the "removed" and "faulty" bits on any missing devices */
1309 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1310 mdp_disk_t
*d
= &sb
->disks
[i
];
1311 if (d
->state
== 0 && d
->number
== 0) {
1314 d
->state
= (1<<MD_DISK_REMOVED
);
1315 d
->state
|= (1<<MD_DISK_FAULTY
);
1319 sb
->nr_disks
= nr_disks
;
1320 sb
->active_disks
= active
;
1321 sb
->working_disks
= working
;
1322 sb
->failed_disks
= failed
;
1323 sb
->spare_disks
= spare
;
1325 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1326 sb
->sb_csum
= calc_sb_csum(sb
);
1330 * rdev_size_change for 0.90.0
1332 static unsigned long long
1333 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1335 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1336 return 0; /* component must fit device */
1337 if (rdev
->mddev
->bitmap_info
.offset
)
1338 return 0; /* can't move bitmap */
1339 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1340 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1341 num_sectors
= rdev
->sb_start
;
1342 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1344 md_super_wait(rdev
->mddev
);
1350 * version 1 superblock
1353 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1357 unsigned long long newcsum
;
1358 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1359 __le32
*isuper
= (__le32
*)sb
;
1362 disk_csum
= sb
->sb_csum
;
1365 for (i
=0; size
>=4; size
-= 4 )
1366 newcsum
+= le32_to_cpu(*isuper
++);
1369 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1371 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1372 sb
->sb_csum
= disk_csum
;
1373 return cpu_to_le32(csum
);
1376 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1378 struct mdp_superblock_1
*sb
;
1381 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1385 * Calculate the position of the superblock in 512byte sectors.
1386 * It is always aligned to a 4K boundary and
1387 * depeding on minor_version, it can be:
1388 * 0: At least 8K, but less than 12K, from end of device
1389 * 1: At start of device
1390 * 2: 4K from start of device.
1392 switch(minor_version
) {
1394 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1396 sb_start
&= ~(sector_t
)(4*2-1);
1407 rdev
->sb_start
= sb_start
;
1409 /* superblock is rarely larger than 1K, but it can be larger,
1410 * and it is safe to read 4k, so we do that
1412 ret
= read_disk_sb(rdev
, 4096);
1413 if (ret
) return ret
;
1416 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1418 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1419 sb
->major_version
!= cpu_to_le32(1) ||
1420 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1421 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1422 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1425 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1426 printk("md: invalid superblock checksum on %s\n",
1427 bdevname(rdev
->bdev
,b
));
1430 if (le64_to_cpu(sb
->data_size
) < 10) {
1431 printk("md: data_size too small on %s\n",
1432 bdevname(rdev
->bdev
,b
));
1436 rdev
->preferred_minor
= 0xffff;
1437 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1438 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1440 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1441 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1442 if (rdev
->sb_size
& bmask
)
1443 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1446 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1449 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1452 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1458 struct mdp_superblock_1
*refsb
=
1459 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1461 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1462 sb
->level
!= refsb
->level
||
1463 sb
->layout
!= refsb
->layout
||
1464 sb
->chunksize
!= refsb
->chunksize
) {
1465 printk(KERN_WARNING
"md: %s has strangely different"
1466 " superblock to %s\n",
1467 bdevname(rdev
->bdev
,b
),
1468 bdevname(refdev
->bdev
,b2
));
1471 ev1
= le64_to_cpu(sb
->events
);
1472 ev2
= le64_to_cpu(refsb
->events
);
1480 rdev
->sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
1481 le64_to_cpu(sb
->data_offset
);
1483 rdev
->sectors
= rdev
->sb_start
;
1484 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1486 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1487 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1492 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1494 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1495 __u64 ev1
= le64_to_cpu(sb
->events
);
1497 rdev
->raid_disk
= -1;
1498 clear_bit(Faulty
, &rdev
->flags
);
1499 clear_bit(In_sync
, &rdev
->flags
);
1500 clear_bit(WriteMostly
, &rdev
->flags
);
1502 if (mddev
->raid_disks
== 0) {
1503 mddev
->major_version
= 1;
1504 mddev
->patch_version
= 0;
1505 mddev
->external
= 0;
1506 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1507 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1508 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1509 mddev
->level
= le32_to_cpu(sb
->level
);
1510 mddev
->clevel
[0] = 0;
1511 mddev
->layout
= le32_to_cpu(sb
->layout
);
1512 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1513 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1514 mddev
->events
= ev1
;
1515 mddev
->bitmap_info
.offset
= 0;
1516 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1518 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1519 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1521 mddev
->max_disks
= (4096-256)/2;
1523 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1524 mddev
->bitmap_info
.file
== NULL
)
1525 mddev
->bitmap_info
.offset
=
1526 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1528 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1529 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1530 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1531 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1532 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1533 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1535 mddev
->reshape_position
= MaxSector
;
1536 mddev
->delta_disks
= 0;
1537 mddev
->new_level
= mddev
->level
;
1538 mddev
->new_layout
= mddev
->layout
;
1539 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1542 } else if (mddev
->pers
== NULL
) {
1543 /* Insist of good event counter while assembling, except for
1544 * spares (which don't need an event count) */
1546 if (rdev
->desc_nr
>= 0 &&
1547 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1548 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1549 if (ev1
< mddev
->events
)
1551 } else if (mddev
->bitmap
) {
1552 /* If adding to array with a bitmap, then we can accept an
1553 * older device, but not too old.
1555 if (ev1
< mddev
->bitmap
->events_cleared
)
1558 if (ev1
< mddev
->events
)
1559 /* just a hot-add of a new device, leave raid_disk at -1 */
1562 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1564 if (rdev
->desc_nr
< 0 ||
1565 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1569 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1571 case 0xffff: /* spare */
1573 case 0xfffe: /* faulty */
1574 set_bit(Faulty
, &rdev
->flags
);
1577 if ((le32_to_cpu(sb
->feature_map
) &
1578 MD_FEATURE_RECOVERY_OFFSET
))
1579 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1581 set_bit(In_sync
, &rdev
->flags
);
1582 rdev
->raid_disk
= role
;
1585 if (sb
->devflags
& WriteMostly1
)
1586 set_bit(WriteMostly
, &rdev
->flags
);
1587 } else /* MULTIPATH are always insync */
1588 set_bit(In_sync
, &rdev
->flags
);
1593 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1595 struct mdp_superblock_1
*sb
;
1598 /* make rdev->sb match mddev and rdev data. */
1600 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1602 sb
->feature_map
= 0;
1604 sb
->recovery_offset
= cpu_to_le64(0);
1605 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1606 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1607 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1609 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1610 sb
->events
= cpu_to_le64(mddev
->events
);
1612 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1614 sb
->resync_offset
= cpu_to_le64(0);
1616 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1618 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1619 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1620 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1621 sb
->level
= cpu_to_le32(mddev
->level
);
1622 sb
->layout
= cpu_to_le32(mddev
->layout
);
1624 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1625 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1626 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1629 if (rdev
->raid_disk
>= 0 &&
1630 !test_bit(In_sync
, &rdev
->flags
)) {
1632 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1633 sb
->recovery_offset
=
1634 cpu_to_le64(rdev
->recovery_offset
);
1637 if (mddev
->reshape_position
!= MaxSector
) {
1638 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1639 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1640 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1641 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1642 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1643 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1647 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1648 if (rdev2
->desc_nr
+1 > max_dev
)
1649 max_dev
= rdev2
->desc_nr
+1;
1651 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1653 sb
->max_dev
= cpu_to_le32(max_dev
);
1654 rdev
->sb_size
= max_dev
* 2 + 256;
1655 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1656 if (rdev
->sb_size
& bmask
)
1657 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1659 max_dev
= le32_to_cpu(sb
->max_dev
);
1661 for (i
=0; i
<max_dev
;i
++)
1662 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1664 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1666 if (test_bit(Faulty
, &rdev2
->flags
))
1667 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1668 else if (test_bit(In_sync
, &rdev2
->flags
))
1669 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1670 else if (rdev2
->raid_disk
>= 0)
1671 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1673 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1676 sb
->sb_csum
= calc_sb_1_csum(sb
);
1679 static unsigned long long
1680 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1682 struct mdp_superblock_1
*sb
;
1683 sector_t max_sectors
;
1684 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1685 return 0; /* component must fit device */
1686 if (rdev
->sb_start
< rdev
->data_offset
) {
1687 /* minor versions 1 and 2; superblock before data */
1688 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1689 max_sectors
-= rdev
->data_offset
;
1690 if (!num_sectors
|| num_sectors
> max_sectors
)
1691 num_sectors
= max_sectors
;
1692 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1693 /* minor version 0 with bitmap we can't move */
1696 /* minor version 0; superblock after data */
1698 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1699 sb_start
&= ~(sector_t
)(4*2 - 1);
1700 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1701 if (!num_sectors
|| num_sectors
> max_sectors
)
1702 num_sectors
= max_sectors
;
1703 rdev
->sb_start
= sb_start
;
1705 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1706 sb
->data_size
= cpu_to_le64(num_sectors
);
1707 sb
->super_offset
= rdev
->sb_start
;
1708 sb
->sb_csum
= calc_sb_1_csum(sb
);
1709 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1711 md_super_wait(rdev
->mddev
);
1715 static struct super_type super_types
[] = {
1718 .owner
= THIS_MODULE
,
1719 .load_super
= super_90_load
,
1720 .validate_super
= super_90_validate
,
1721 .sync_super
= super_90_sync
,
1722 .rdev_size_change
= super_90_rdev_size_change
,
1726 .owner
= THIS_MODULE
,
1727 .load_super
= super_1_load
,
1728 .validate_super
= super_1_validate
,
1729 .sync_super
= super_1_sync
,
1730 .rdev_size_change
= super_1_rdev_size_change
,
1734 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1736 mdk_rdev_t
*rdev
, *rdev2
;
1739 rdev_for_each_rcu(rdev
, mddev1
)
1740 rdev_for_each_rcu(rdev2
, mddev2
)
1741 if (rdev
->bdev
->bd_contains
==
1742 rdev2
->bdev
->bd_contains
) {
1750 static LIST_HEAD(pending_raid_disks
);
1753 * Try to register data integrity profile for an mddev
1755 * This is called when an array is started and after a disk has been kicked
1756 * from the array. It only succeeds if all working and active component devices
1757 * are integrity capable with matching profiles.
1759 int md_integrity_register(mddev_t
*mddev
)
1761 mdk_rdev_t
*rdev
, *reference
= NULL
;
1763 if (list_empty(&mddev
->disks
))
1764 return 0; /* nothing to do */
1765 if (blk_get_integrity(mddev
->gendisk
))
1766 return 0; /* already registered */
1767 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1768 /* skip spares and non-functional disks */
1769 if (test_bit(Faulty
, &rdev
->flags
))
1771 if (rdev
->raid_disk
< 0)
1774 * If at least one rdev is not integrity capable, we can not
1775 * enable data integrity for the md device.
1777 if (!bdev_get_integrity(rdev
->bdev
))
1780 /* Use the first rdev as the reference */
1784 /* does this rdev's profile match the reference profile? */
1785 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1786 rdev
->bdev
->bd_disk
) < 0)
1790 * All component devices are integrity capable and have matching
1791 * profiles, register the common profile for the md device.
1793 if (blk_integrity_register(mddev
->gendisk
,
1794 bdev_get_integrity(reference
->bdev
)) != 0) {
1795 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1799 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1803 EXPORT_SYMBOL(md_integrity_register
);
1805 /* Disable data integrity if non-capable/non-matching disk is being added */
1806 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1808 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1809 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1811 if (!bi_mddev
) /* nothing to do */
1813 if (rdev
->raid_disk
< 0) /* skip spares */
1815 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1816 rdev
->bdev
->bd_disk
) >= 0)
1818 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1819 blk_integrity_unregister(mddev
->gendisk
);
1821 EXPORT_SYMBOL(md_integrity_add_rdev
);
1823 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1825 char b
[BDEVNAME_SIZE
];
1835 /* prevent duplicates */
1836 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1839 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1840 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1841 rdev
->sectors
< mddev
->dev_sectors
)) {
1843 /* Cannot change size, so fail
1844 * If mddev->level <= 0, then we don't care
1845 * about aligning sizes (e.g. linear)
1847 if (mddev
->level
> 0)
1850 mddev
->dev_sectors
= rdev
->sectors
;
1853 /* Verify rdev->desc_nr is unique.
1854 * If it is -1, assign a free number, else
1855 * check number is not in use
1857 if (rdev
->desc_nr
< 0) {
1859 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1860 while (find_rdev_nr(mddev
, choice
))
1862 rdev
->desc_nr
= choice
;
1864 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1867 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1868 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1869 mdname(mddev
), mddev
->max_disks
);
1872 bdevname(rdev
->bdev
,b
);
1873 while ( (s
=strchr(b
, '/')) != NULL
)
1876 rdev
->mddev
= mddev
;
1877 printk(KERN_INFO
"md: bind<%s>\n", b
);
1879 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1882 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1883 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1884 /* failure here is OK */;
1885 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1887 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1888 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
1890 /* May as well allow recovery to be retried once */
1891 mddev
->recovery_disabled
= 0;
1896 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1901 static void md_delayed_delete(struct work_struct
*ws
)
1903 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1904 kobject_del(&rdev
->kobj
);
1905 kobject_put(&rdev
->kobj
);
1908 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1910 char b
[BDEVNAME_SIZE
];
1915 list_del_rcu(&rdev
->same_set
);
1916 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1918 sysfs_remove_link(&rdev
->kobj
, "block");
1919 sysfs_put(rdev
->sysfs_state
);
1920 rdev
->sysfs_state
= NULL
;
1921 /* We need to delay this, otherwise we can deadlock when
1922 * writing to 'remove' to "dev/state". We also need
1923 * to delay it due to rcu usage.
1926 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1927 kobject_get(&rdev
->kobj
);
1928 queue_work(md_misc_wq
, &rdev
->del_work
);
1932 * prevent the device from being mounted, repartitioned or
1933 * otherwise reused by a RAID array (or any other kernel
1934 * subsystem), by bd_claiming the device.
1936 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1939 struct block_device
*bdev
;
1940 char b
[BDEVNAME_SIZE
];
1942 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
1943 shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1945 printk(KERN_ERR
"md: could not open %s.\n",
1946 __bdevname(dev
, b
));
1947 return PTR_ERR(bdev
);
1950 set_bit(AllReserved
, &rdev
->flags
);
1955 static void unlock_rdev(mdk_rdev_t
*rdev
)
1957 struct block_device
*bdev
= rdev
->bdev
;
1961 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
1964 void md_autodetect_dev(dev_t dev
);
1966 static void export_rdev(mdk_rdev_t
* rdev
)
1968 char b
[BDEVNAME_SIZE
];
1969 printk(KERN_INFO
"md: export_rdev(%s)\n",
1970 bdevname(rdev
->bdev
,b
));
1975 if (test_bit(AutoDetected
, &rdev
->flags
))
1976 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1979 kobject_put(&rdev
->kobj
);
1982 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1984 unbind_rdev_from_array(rdev
);
1988 static void export_array(mddev_t
*mddev
)
1990 mdk_rdev_t
*rdev
, *tmp
;
1992 rdev_for_each(rdev
, tmp
, mddev
) {
1997 kick_rdev_from_array(rdev
);
1999 if (!list_empty(&mddev
->disks
))
2001 mddev
->raid_disks
= 0;
2002 mddev
->major_version
= 0;
2005 static void print_desc(mdp_disk_t
*desc
)
2007 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2008 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2011 static void print_sb_90(mdp_super_t
*sb
)
2016 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2017 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2018 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2020 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2021 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2022 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2023 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2024 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2025 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2026 sb
->failed_disks
, sb
->spare_disks
,
2027 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2030 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2033 desc
= sb
->disks
+ i
;
2034 if (desc
->number
|| desc
->major
|| desc
->minor
||
2035 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2036 printk(" D %2d: ", i
);
2040 printk(KERN_INFO
"md: THIS: ");
2041 print_desc(&sb
->this_disk
);
2044 static void print_sb_1(struct mdp_superblock_1
*sb
)
2048 uuid
= sb
->set_uuid
;
2050 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2051 "md: Name: \"%s\" CT:%llu\n",
2052 le32_to_cpu(sb
->major_version
),
2053 le32_to_cpu(sb
->feature_map
),
2056 (unsigned long long)le64_to_cpu(sb
->ctime
)
2057 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2059 uuid
= sb
->device_uuid
;
2061 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2063 "md: Dev:%08x UUID: %pU\n"
2064 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2065 "md: (MaxDev:%u) \n",
2066 le32_to_cpu(sb
->level
),
2067 (unsigned long long)le64_to_cpu(sb
->size
),
2068 le32_to_cpu(sb
->raid_disks
),
2069 le32_to_cpu(sb
->layout
),
2070 le32_to_cpu(sb
->chunksize
),
2071 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2072 (unsigned long long)le64_to_cpu(sb
->data_size
),
2073 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2074 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2075 le32_to_cpu(sb
->dev_number
),
2078 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2079 (unsigned long long)le64_to_cpu(sb
->events
),
2080 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2081 le32_to_cpu(sb
->sb_csum
),
2082 le32_to_cpu(sb
->max_dev
)
2086 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2088 char b
[BDEVNAME_SIZE
];
2089 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2090 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2091 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2093 if (rdev
->sb_loaded
) {
2094 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2095 switch (major_version
) {
2097 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2100 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2104 printk(KERN_INFO
"md: no rdev superblock!\n");
2107 static void md_print_devices(void)
2109 struct list_head
*tmp
;
2112 char b
[BDEVNAME_SIZE
];
2115 printk("md: **********************************\n");
2116 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2117 printk("md: **********************************\n");
2118 for_each_mddev(mddev
, tmp
) {
2121 bitmap_print_sb(mddev
->bitmap
);
2123 printk("%s: ", mdname(mddev
));
2124 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2125 printk("<%s>", bdevname(rdev
->bdev
,b
));
2128 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2129 print_rdev(rdev
, mddev
->major_version
);
2131 printk("md: **********************************\n");
2136 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2138 /* Update each superblock (in-memory image), but
2139 * if we are allowed to, skip spares which already
2140 * have the right event counter, or have one earlier
2141 * (which would mean they aren't being marked as dirty
2142 * with the rest of the array)
2145 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2146 if (rdev
->sb_events
== mddev
->events
||
2148 rdev
->raid_disk
< 0 &&
2149 rdev
->sb_events
+1 == mddev
->events
)) {
2150 /* Don't update this superblock */
2151 rdev
->sb_loaded
= 2;
2153 super_types
[mddev
->major_version
].
2154 sync_super(mddev
, rdev
);
2155 rdev
->sb_loaded
= 1;
2160 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2167 /* First make sure individual recovery_offsets are correct */
2168 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2169 if (rdev
->raid_disk
>= 0 &&
2170 mddev
->delta_disks
>= 0 &&
2171 !test_bit(In_sync
, &rdev
->flags
) &&
2172 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2173 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2176 if (!mddev
->persistent
) {
2177 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2178 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2179 if (!mddev
->external
)
2180 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2181 wake_up(&mddev
->sb_wait
);
2185 spin_lock_irq(&mddev
->write_lock
);
2187 mddev
->utime
= get_seconds();
2189 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2191 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2192 /* just a clean<-> dirty transition, possibly leave spares alone,
2193 * though if events isn't the right even/odd, we will have to do
2199 if (mddev
->degraded
)
2200 /* If the array is degraded, then skipping spares is both
2201 * dangerous and fairly pointless.
2202 * Dangerous because a device that was removed from the array
2203 * might have a event_count that still looks up-to-date,
2204 * so it can be re-added without a resync.
2205 * Pointless because if there are any spares to skip,
2206 * then a recovery will happen and soon that array won't
2207 * be degraded any more and the spare can go back to sleep then.
2211 sync_req
= mddev
->in_sync
;
2213 /* If this is just a dirty<->clean transition, and the array is clean
2214 * and 'events' is odd, we can roll back to the previous clean state */
2216 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2217 && mddev
->can_decrease_events
2218 && mddev
->events
!= 1) {
2220 mddev
->can_decrease_events
= 0;
2222 /* otherwise we have to go forward and ... */
2224 mddev
->can_decrease_events
= nospares
;
2227 if (!mddev
->events
) {
2229 * oops, this 64-bit counter should never wrap.
2230 * Either we are in around ~1 trillion A.C., assuming
2231 * 1 reboot per second, or we have a bug:
2236 sync_sbs(mddev
, nospares
);
2237 spin_unlock_irq(&mddev
->write_lock
);
2240 "md: updating %s RAID superblock on device (in sync %d)\n",
2241 mdname(mddev
),mddev
->in_sync
);
2243 bitmap_update_sb(mddev
->bitmap
);
2244 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2245 char b
[BDEVNAME_SIZE
];
2246 dprintk(KERN_INFO
"md: ");
2247 if (rdev
->sb_loaded
!= 1)
2248 continue; /* no noise on spare devices */
2249 if (test_bit(Faulty
, &rdev
->flags
))
2250 dprintk("(skipping faulty ");
2252 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2253 if (!test_bit(Faulty
, &rdev
->flags
)) {
2254 md_super_write(mddev
,rdev
,
2255 rdev
->sb_start
, rdev
->sb_size
,
2257 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2258 bdevname(rdev
->bdev
,b
),
2259 (unsigned long long)rdev
->sb_start
);
2260 rdev
->sb_events
= mddev
->events
;
2264 if (mddev
->level
== LEVEL_MULTIPATH
)
2265 /* only need to write one superblock... */
2268 md_super_wait(mddev
);
2269 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2271 spin_lock_irq(&mddev
->write_lock
);
2272 if (mddev
->in_sync
!= sync_req
||
2273 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2274 /* have to write it out again */
2275 spin_unlock_irq(&mddev
->write_lock
);
2278 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2279 spin_unlock_irq(&mddev
->write_lock
);
2280 wake_up(&mddev
->sb_wait
);
2281 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2282 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2286 /* words written to sysfs files may, or may not, be \n terminated.
2287 * We want to accept with case. For this we use cmd_match.
2289 static int cmd_match(const char *cmd
, const char *str
)
2291 /* See if cmd, written into a sysfs file, matches
2292 * str. They must either be the same, or cmd can
2293 * have a trailing newline
2295 while (*cmd
&& *str
&& *cmd
== *str
) {
2306 struct rdev_sysfs_entry
{
2307 struct attribute attr
;
2308 ssize_t (*show
)(mdk_rdev_t
*, char *);
2309 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2313 state_show(mdk_rdev_t
*rdev
, char *page
)
2318 if (test_bit(Faulty
, &rdev
->flags
)) {
2319 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2322 if (test_bit(In_sync
, &rdev
->flags
)) {
2323 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2326 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2327 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2330 if (test_bit(Blocked
, &rdev
->flags
)) {
2331 len
+= sprintf(page
+len
, "%sblocked", sep
);
2334 if (!test_bit(Faulty
, &rdev
->flags
) &&
2335 !test_bit(In_sync
, &rdev
->flags
)) {
2336 len
+= sprintf(page
+len
, "%sspare", sep
);
2339 return len
+sprintf(page
+len
, "\n");
2343 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2346 * faulty - simulates and error
2347 * remove - disconnects the device
2348 * writemostly - sets write_mostly
2349 * -writemostly - clears write_mostly
2350 * blocked - sets the Blocked flag
2351 * -blocked - clears the Blocked flag
2352 * insync - sets Insync providing device isn't active
2355 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2356 md_error(rdev
->mddev
, rdev
);
2358 } else if (cmd_match(buf
, "remove")) {
2359 if (rdev
->raid_disk
>= 0)
2362 mddev_t
*mddev
= rdev
->mddev
;
2363 kick_rdev_from_array(rdev
);
2365 md_update_sb(mddev
, 1);
2366 md_new_event(mddev
);
2369 } else if (cmd_match(buf
, "writemostly")) {
2370 set_bit(WriteMostly
, &rdev
->flags
);
2372 } else if (cmd_match(buf
, "-writemostly")) {
2373 clear_bit(WriteMostly
, &rdev
->flags
);
2375 } else if (cmd_match(buf
, "blocked")) {
2376 set_bit(Blocked
, &rdev
->flags
);
2378 } else if (cmd_match(buf
, "-blocked")) {
2379 clear_bit(Blocked
, &rdev
->flags
);
2380 wake_up(&rdev
->blocked_wait
);
2381 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2382 md_wakeup_thread(rdev
->mddev
->thread
);
2385 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2386 set_bit(In_sync
, &rdev
->flags
);
2390 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2391 return err
? err
: len
;
2393 static struct rdev_sysfs_entry rdev_state
=
2394 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2397 errors_show(mdk_rdev_t
*rdev
, char *page
)
2399 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2403 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2406 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2407 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2408 atomic_set(&rdev
->corrected_errors
, n
);
2413 static struct rdev_sysfs_entry rdev_errors
=
2414 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2417 slot_show(mdk_rdev_t
*rdev
, char *page
)
2419 if (rdev
->raid_disk
< 0)
2420 return sprintf(page
, "none\n");
2422 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2426 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2431 int slot
= simple_strtoul(buf
, &e
, 10);
2432 if (strncmp(buf
, "none", 4)==0)
2434 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2436 if (rdev
->mddev
->pers
&& slot
== -1) {
2437 /* Setting 'slot' on an active array requires also
2438 * updating the 'rd%d' link, and communicating
2439 * with the personality with ->hot_*_disk.
2440 * For now we only support removing
2441 * failed/spare devices. This normally happens automatically,
2442 * but not when the metadata is externally managed.
2444 if (rdev
->raid_disk
== -1)
2446 /* personality does all needed checks */
2447 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2449 err
= rdev
->mddev
->pers
->
2450 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2453 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2454 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2455 rdev
->raid_disk
= -1;
2456 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2457 md_wakeup_thread(rdev
->mddev
->thread
);
2458 } else if (rdev
->mddev
->pers
) {
2460 /* Activating a spare .. or possibly reactivating
2461 * if we ever get bitmaps working here.
2464 if (rdev
->raid_disk
!= -1)
2467 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2470 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2471 if (rdev2
->raid_disk
== slot
)
2474 if (slot
>= rdev
->mddev
->raid_disks
&&
2475 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2478 rdev
->raid_disk
= slot
;
2479 if (test_bit(In_sync
, &rdev
->flags
))
2480 rdev
->saved_raid_disk
= slot
;
2482 rdev
->saved_raid_disk
= -1;
2483 err
= rdev
->mddev
->pers
->
2484 hot_add_disk(rdev
->mddev
, rdev
);
2486 rdev
->raid_disk
= -1;
2489 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2490 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2491 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2492 /* failure here is OK */;
2493 /* don't wakeup anyone, leave that to userspace. */
2495 if (slot
>= rdev
->mddev
->raid_disks
&&
2496 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2498 rdev
->raid_disk
= slot
;
2499 /* assume it is working */
2500 clear_bit(Faulty
, &rdev
->flags
);
2501 clear_bit(WriteMostly
, &rdev
->flags
);
2502 set_bit(In_sync
, &rdev
->flags
);
2503 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2509 static struct rdev_sysfs_entry rdev_slot
=
2510 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2513 offset_show(mdk_rdev_t
*rdev
, char *page
)
2515 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2519 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2522 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2523 if (e
==buf
|| (*e
&& *e
!= '\n'))
2525 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2527 if (rdev
->sectors
&& rdev
->mddev
->external
)
2528 /* Must set offset before size, so overlap checks
2531 rdev
->data_offset
= offset
;
2535 static struct rdev_sysfs_entry rdev_offset
=
2536 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2539 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2541 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2544 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2546 /* check if two start/length pairs overlap */
2554 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2556 unsigned long long blocks
;
2559 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2562 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2563 return -EINVAL
; /* sector conversion overflow */
2566 if (new != blocks
* 2)
2567 return -EINVAL
; /* unsigned long long to sector_t overflow */
2574 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2576 mddev_t
*my_mddev
= rdev
->mddev
;
2577 sector_t oldsectors
= rdev
->sectors
;
2580 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2582 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2583 if (my_mddev
->persistent
) {
2584 sectors
= super_types
[my_mddev
->major_version
].
2585 rdev_size_change(rdev
, sectors
);
2588 } else if (!sectors
)
2589 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2592 if (sectors
< my_mddev
->dev_sectors
)
2593 return -EINVAL
; /* component must fit device */
2595 rdev
->sectors
= sectors
;
2596 if (sectors
> oldsectors
&& my_mddev
->external
) {
2597 /* need to check that all other rdevs with the same ->bdev
2598 * do not overlap. We need to unlock the mddev to avoid
2599 * a deadlock. We have already changed rdev->sectors, and if
2600 * we have to change it back, we will have the lock again.
2604 struct list_head
*tmp
;
2606 mddev_unlock(my_mddev
);
2607 for_each_mddev(mddev
, tmp
) {
2611 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2612 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2613 (rdev
->bdev
== rdev2
->bdev
&&
2615 overlaps(rdev
->data_offset
, rdev
->sectors
,
2621 mddev_unlock(mddev
);
2627 mddev_lock(my_mddev
);
2629 /* Someone else could have slipped in a size
2630 * change here, but doing so is just silly.
2631 * We put oldsectors back because we *know* it is
2632 * safe, and trust userspace not to race with
2635 rdev
->sectors
= oldsectors
;
2642 static struct rdev_sysfs_entry rdev_size
=
2643 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2646 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2648 unsigned long long recovery_start
= rdev
->recovery_offset
;
2650 if (test_bit(In_sync
, &rdev
->flags
) ||
2651 recovery_start
== MaxSector
)
2652 return sprintf(page
, "none\n");
2654 return sprintf(page
, "%llu\n", recovery_start
);
2657 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2659 unsigned long long recovery_start
;
2661 if (cmd_match(buf
, "none"))
2662 recovery_start
= MaxSector
;
2663 else if (strict_strtoull(buf
, 10, &recovery_start
))
2666 if (rdev
->mddev
->pers
&&
2667 rdev
->raid_disk
>= 0)
2670 rdev
->recovery_offset
= recovery_start
;
2671 if (recovery_start
== MaxSector
)
2672 set_bit(In_sync
, &rdev
->flags
);
2674 clear_bit(In_sync
, &rdev
->flags
);
2678 static struct rdev_sysfs_entry rdev_recovery_start
=
2679 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2681 static struct attribute
*rdev_default_attrs
[] = {
2687 &rdev_recovery_start
.attr
,
2691 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2693 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2694 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2695 mddev_t
*mddev
= rdev
->mddev
;
2701 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2703 if (rdev
->mddev
== NULL
)
2706 rv
= entry
->show(rdev
, page
);
2707 mddev_unlock(mddev
);
2713 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2714 const char *page
, size_t length
)
2716 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2717 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2719 mddev_t
*mddev
= rdev
->mddev
;
2723 if (!capable(CAP_SYS_ADMIN
))
2725 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2727 if (rdev
->mddev
== NULL
)
2730 rv
= entry
->store(rdev
, page
, length
);
2731 mddev_unlock(mddev
);
2736 static void rdev_free(struct kobject
*ko
)
2738 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2741 static const struct sysfs_ops rdev_sysfs_ops
= {
2742 .show
= rdev_attr_show
,
2743 .store
= rdev_attr_store
,
2745 static struct kobj_type rdev_ktype
= {
2746 .release
= rdev_free
,
2747 .sysfs_ops
= &rdev_sysfs_ops
,
2748 .default_attrs
= rdev_default_attrs
,
2751 void md_rdev_init(mdk_rdev_t
*rdev
)
2754 rdev
->saved_raid_disk
= -1;
2755 rdev
->raid_disk
= -1;
2757 rdev
->data_offset
= 0;
2758 rdev
->sb_events
= 0;
2759 rdev
->last_read_error
.tv_sec
= 0;
2760 rdev
->last_read_error
.tv_nsec
= 0;
2761 atomic_set(&rdev
->nr_pending
, 0);
2762 atomic_set(&rdev
->read_errors
, 0);
2763 atomic_set(&rdev
->corrected_errors
, 0);
2765 INIT_LIST_HEAD(&rdev
->same_set
);
2766 init_waitqueue_head(&rdev
->blocked_wait
);
2768 EXPORT_SYMBOL_GPL(md_rdev_init
);
2770 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2772 * mark the device faulty if:
2774 * - the device is nonexistent (zero size)
2775 * - the device has no valid superblock
2777 * a faulty rdev _never_ has rdev->sb set.
2779 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2781 char b
[BDEVNAME_SIZE
];
2786 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2788 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2789 return ERR_PTR(-ENOMEM
);
2793 if ((err
= alloc_disk_sb(rdev
)))
2796 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2800 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2802 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
2805 "md: %s has zero or unknown size, marking faulty!\n",
2806 bdevname(rdev
->bdev
,b
));
2811 if (super_format
>= 0) {
2812 err
= super_types
[super_format
].
2813 load_super(rdev
, NULL
, super_minor
);
2814 if (err
== -EINVAL
) {
2816 "md: %s does not have a valid v%d.%d "
2817 "superblock, not importing!\n",
2818 bdevname(rdev
->bdev
,b
),
2819 super_format
, super_minor
);
2824 "md: could not read %s's sb, not importing!\n",
2825 bdevname(rdev
->bdev
,b
));
2833 if (rdev
->sb_page
) {
2839 return ERR_PTR(err
);
2843 * Check a full RAID array for plausibility
2847 static void analyze_sbs(mddev_t
* mddev
)
2850 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2851 char b
[BDEVNAME_SIZE
];
2854 rdev_for_each(rdev
, tmp
, mddev
)
2855 switch (super_types
[mddev
->major_version
].
2856 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2864 "md: fatal superblock inconsistency in %s"
2865 " -- removing from array\n",
2866 bdevname(rdev
->bdev
,b
));
2867 kick_rdev_from_array(rdev
);
2871 super_types
[mddev
->major_version
].
2872 validate_super(mddev
, freshest
);
2875 rdev_for_each(rdev
, tmp
, mddev
) {
2876 if (mddev
->max_disks
&&
2877 (rdev
->desc_nr
>= mddev
->max_disks
||
2878 i
> mddev
->max_disks
)) {
2880 "md: %s: %s: only %d devices permitted\n",
2881 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2883 kick_rdev_from_array(rdev
);
2886 if (rdev
!= freshest
)
2887 if (super_types
[mddev
->major_version
].
2888 validate_super(mddev
, rdev
)) {
2889 printk(KERN_WARNING
"md: kicking non-fresh %s"
2891 bdevname(rdev
->bdev
,b
));
2892 kick_rdev_from_array(rdev
);
2895 if (mddev
->level
== LEVEL_MULTIPATH
) {
2896 rdev
->desc_nr
= i
++;
2897 rdev
->raid_disk
= rdev
->desc_nr
;
2898 set_bit(In_sync
, &rdev
->flags
);
2899 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2900 rdev
->raid_disk
= -1;
2901 clear_bit(In_sync
, &rdev
->flags
);
2906 /* Read a fixed-point number.
2907 * Numbers in sysfs attributes should be in "standard" units where
2908 * possible, so time should be in seconds.
2909 * However we internally use a a much smaller unit such as
2910 * milliseconds or jiffies.
2911 * This function takes a decimal number with a possible fractional
2912 * component, and produces an integer which is the result of
2913 * multiplying that number by 10^'scale'.
2914 * all without any floating-point arithmetic.
2916 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2918 unsigned long result
= 0;
2920 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2923 else if (decimals
< scale
) {
2926 result
= result
* 10 + value
;
2938 while (decimals
< scale
) {
2947 static void md_safemode_timeout(unsigned long data
);
2950 safe_delay_show(mddev_t
*mddev
, char *page
)
2952 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2953 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2956 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2960 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2963 mddev
->safemode_delay
= 0;
2965 unsigned long old_delay
= mddev
->safemode_delay
;
2966 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2967 if (mddev
->safemode_delay
== 0)
2968 mddev
->safemode_delay
= 1;
2969 if (mddev
->safemode_delay
< old_delay
)
2970 md_safemode_timeout((unsigned long)mddev
);
2974 static struct md_sysfs_entry md_safe_delay
=
2975 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2978 level_show(mddev_t
*mddev
, char *page
)
2980 struct mdk_personality
*p
= mddev
->pers
;
2982 return sprintf(page
, "%s\n", p
->name
);
2983 else if (mddev
->clevel
[0])
2984 return sprintf(page
, "%s\n", mddev
->clevel
);
2985 else if (mddev
->level
!= LEVEL_NONE
)
2986 return sprintf(page
, "%d\n", mddev
->level
);
2992 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2996 struct mdk_personality
*pers
;
3001 if (mddev
->pers
== NULL
) {
3004 if (len
>= sizeof(mddev
->clevel
))
3006 strncpy(mddev
->clevel
, buf
, len
);
3007 if (mddev
->clevel
[len
-1] == '\n')
3009 mddev
->clevel
[len
] = 0;
3010 mddev
->level
= LEVEL_NONE
;
3014 /* request to change the personality. Need to ensure:
3015 * - array is not engaged in resync/recovery/reshape
3016 * - old personality can be suspended
3017 * - new personality will access other array.
3020 if (mddev
->sync_thread
||
3021 mddev
->reshape_position
!= MaxSector
||
3022 mddev
->sysfs_active
)
3025 if (!mddev
->pers
->quiesce
) {
3026 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3027 mdname(mddev
), mddev
->pers
->name
);
3031 /* Now find the new personality */
3032 if (len
== 0 || len
>= sizeof(clevel
))
3034 strncpy(clevel
, buf
, len
);
3035 if (clevel
[len
-1] == '\n')
3038 if (strict_strtol(clevel
, 10, &level
))
3041 if (request_module("md-%s", clevel
) != 0)
3042 request_module("md-level-%s", clevel
);
3043 spin_lock(&pers_lock
);
3044 pers
= find_pers(level
, clevel
);
3045 if (!pers
|| !try_module_get(pers
->owner
)) {
3046 spin_unlock(&pers_lock
);
3047 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3050 spin_unlock(&pers_lock
);
3052 if (pers
== mddev
->pers
) {
3053 /* Nothing to do! */
3054 module_put(pers
->owner
);
3057 if (!pers
->takeover
) {
3058 module_put(pers
->owner
);
3059 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3060 mdname(mddev
), clevel
);
3064 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3065 rdev
->new_raid_disk
= rdev
->raid_disk
;
3067 /* ->takeover must set new_* and/or delta_disks
3068 * if it succeeds, and may set them when it fails.
3070 priv
= pers
->takeover(mddev
);
3072 mddev
->new_level
= mddev
->level
;
3073 mddev
->new_layout
= mddev
->layout
;
3074 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3075 mddev
->raid_disks
-= mddev
->delta_disks
;
3076 mddev
->delta_disks
= 0;
3077 module_put(pers
->owner
);
3078 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3079 mdname(mddev
), clevel
);
3080 return PTR_ERR(priv
);
3083 /* Looks like we have a winner */
3084 mddev_suspend(mddev
);
3085 mddev
->pers
->stop(mddev
);
3087 if (mddev
->pers
->sync_request
== NULL
&&
3088 pers
->sync_request
!= NULL
) {
3089 /* need to add the md_redundancy_group */
3090 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3092 "md: cannot register extra attributes for %s\n",
3094 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3096 if (mddev
->pers
->sync_request
!= NULL
&&
3097 pers
->sync_request
== NULL
) {
3098 /* need to remove the md_redundancy_group */
3099 if (mddev
->to_remove
== NULL
)
3100 mddev
->to_remove
= &md_redundancy_group
;
3103 if (mddev
->pers
->sync_request
== NULL
&&
3105 /* We are converting from a no-redundancy array
3106 * to a redundancy array and metadata is managed
3107 * externally so we need to be sure that writes
3108 * won't block due to a need to transition
3110 * until external management is started.
3113 mddev
->safemode_delay
= 0;
3114 mddev
->safemode
= 0;
3117 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3119 if (rdev
->raid_disk
< 0)
3121 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3122 rdev
->new_raid_disk
= -1;
3123 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3125 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3126 sysfs_remove_link(&mddev
->kobj
, nm
);
3128 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3129 if (rdev
->raid_disk
< 0)
3131 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3133 rdev
->raid_disk
= rdev
->new_raid_disk
;
3134 if (rdev
->raid_disk
< 0)
3135 clear_bit(In_sync
, &rdev
->flags
);
3138 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3139 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3140 printk("md: cannot register %s for %s after level change\n",
3145 module_put(mddev
->pers
->owner
);
3147 mddev
->private = priv
;
3148 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3149 mddev
->level
= mddev
->new_level
;
3150 mddev
->layout
= mddev
->new_layout
;
3151 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3152 mddev
->delta_disks
= 0;
3153 if (mddev
->pers
->sync_request
== NULL
) {
3154 /* this is now an array without redundancy, so
3155 * it must always be in_sync
3158 del_timer_sync(&mddev
->safemode_timer
);
3161 mddev_resume(mddev
);
3162 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3163 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3164 md_wakeup_thread(mddev
->thread
);
3165 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3166 md_new_event(mddev
);
3170 static struct md_sysfs_entry md_level
=
3171 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3175 layout_show(mddev_t
*mddev
, char *page
)
3177 /* just a number, not meaningful for all levels */
3178 if (mddev
->reshape_position
!= MaxSector
&&
3179 mddev
->layout
!= mddev
->new_layout
)
3180 return sprintf(page
, "%d (%d)\n",
3181 mddev
->new_layout
, mddev
->layout
);
3182 return sprintf(page
, "%d\n", mddev
->layout
);
3186 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3189 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3191 if (!*buf
|| (*e
&& *e
!= '\n'))
3196 if (mddev
->pers
->check_reshape
== NULL
)
3198 mddev
->new_layout
= n
;
3199 err
= mddev
->pers
->check_reshape(mddev
);
3201 mddev
->new_layout
= mddev
->layout
;
3205 mddev
->new_layout
= n
;
3206 if (mddev
->reshape_position
== MaxSector
)
3211 static struct md_sysfs_entry md_layout
=
3212 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3216 raid_disks_show(mddev_t
*mddev
, char *page
)
3218 if (mddev
->raid_disks
== 0)
3220 if (mddev
->reshape_position
!= MaxSector
&&
3221 mddev
->delta_disks
!= 0)
3222 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3223 mddev
->raid_disks
- mddev
->delta_disks
);
3224 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3227 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3230 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3234 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3236 if (!*buf
|| (*e
&& *e
!= '\n'))
3240 rv
= update_raid_disks(mddev
, n
);
3241 else if (mddev
->reshape_position
!= MaxSector
) {
3242 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3243 mddev
->delta_disks
= n
- olddisks
;
3244 mddev
->raid_disks
= n
;
3246 mddev
->raid_disks
= n
;
3247 return rv
? rv
: len
;
3249 static struct md_sysfs_entry md_raid_disks
=
3250 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3253 chunk_size_show(mddev_t
*mddev
, char *page
)
3255 if (mddev
->reshape_position
!= MaxSector
&&
3256 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3257 return sprintf(page
, "%d (%d)\n",
3258 mddev
->new_chunk_sectors
<< 9,
3259 mddev
->chunk_sectors
<< 9);
3260 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3264 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3267 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3269 if (!*buf
|| (*e
&& *e
!= '\n'))
3274 if (mddev
->pers
->check_reshape
== NULL
)
3276 mddev
->new_chunk_sectors
= n
>> 9;
3277 err
= mddev
->pers
->check_reshape(mddev
);
3279 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3283 mddev
->new_chunk_sectors
= n
>> 9;
3284 if (mddev
->reshape_position
== MaxSector
)
3285 mddev
->chunk_sectors
= n
>> 9;
3289 static struct md_sysfs_entry md_chunk_size
=
3290 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3293 resync_start_show(mddev_t
*mddev
, char *page
)
3295 if (mddev
->recovery_cp
== MaxSector
)
3296 return sprintf(page
, "none\n");
3297 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3301 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3304 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3308 if (cmd_match(buf
, "none"))
3310 else if (!*buf
|| (*e
&& *e
!= '\n'))
3313 mddev
->recovery_cp
= n
;
3316 static struct md_sysfs_entry md_resync_start
=
3317 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3320 * The array state can be:
3323 * No devices, no size, no level
3324 * Equivalent to STOP_ARRAY ioctl
3326 * May have some settings, but array is not active
3327 * all IO results in error
3328 * When written, doesn't tear down array, but just stops it
3329 * suspended (not supported yet)
3330 * All IO requests will block. The array can be reconfigured.
3331 * Writing this, if accepted, will block until array is quiescent
3333 * no resync can happen. no superblocks get written.
3334 * write requests fail
3336 * like readonly, but behaves like 'clean' on a write request.
3338 * clean - no pending writes, but otherwise active.
3339 * When written to inactive array, starts without resync
3340 * If a write request arrives then
3341 * if metadata is known, mark 'dirty' and switch to 'active'.
3342 * if not known, block and switch to write-pending
3343 * If written to an active array that has pending writes, then fails.
3345 * fully active: IO and resync can be happening.
3346 * When written to inactive array, starts with resync
3349 * clean, but writes are blocked waiting for 'active' to be written.
3352 * like active, but no writes have been seen for a while (100msec).
3355 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3356 write_pending
, active_idle
, bad_word
};
3357 static char *array_states
[] = {
3358 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3359 "write-pending", "active-idle", NULL
};
3361 static int match_word(const char *word
, char **list
)
3364 for (n
=0; list
[n
]; n
++)
3365 if (cmd_match(word
, list
[n
]))
3371 array_state_show(mddev_t
*mddev
, char *page
)
3373 enum array_state st
= inactive
;
3386 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3388 else if (mddev
->safemode
)
3394 if (list_empty(&mddev
->disks
) &&
3395 mddev
->raid_disks
== 0 &&
3396 mddev
->dev_sectors
== 0)
3401 return sprintf(page
, "%s\n", array_states
[st
]);
3404 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3405 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3406 static int do_md_run(mddev_t
* mddev
);
3407 static int restart_array(mddev_t
*mddev
);
3410 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3413 enum array_state st
= match_word(buf
, array_states
);
3418 /* stopping an active array */
3419 if (atomic_read(&mddev
->openers
) > 0)
3421 err
= do_md_stop(mddev
, 0, 0);
3424 /* stopping an active array */
3426 if (atomic_read(&mddev
->openers
) > 0)
3428 err
= do_md_stop(mddev
, 2, 0);
3430 err
= 0; /* already inactive */
3433 break; /* not supported yet */
3436 err
= md_set_readonly(mddev
, 0);
3439 set_disk_ro(mddev
->gendisk
, 1);
3440 err
= do_md_run(mddev
);
3446 err
= md_set_readonly(mddev
, 0);
3447 else if (mddev
->ro
== 1)
3448 err
= restart_array(mddev
);
3451 set_disk_ro(mddev
->gendisk
, 0);
3455 err
= do_md_run(mddev
);
3460 restart_array(mddev
);
3461 spin_lock_irq(&mddev
->write_lock
);
3462 if (atomic_read(&mddev
->writes_pending
) == 0) {
3463 if (mddev
->in_sync
== 0) {
3465 if (mddev
->safemode
== 1)
3466 mddev
->safemode
= 0;
3467 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3472 spin_unlock_irq(&mddev
->write_lock
);
3478 restart_array(mddev
);
3479 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3480 wake_up(&mddev
->sb_wait
);
3484 set_disk_ro(mddev
->gendisk
, 0);
3485 err
= do_md_run(mddev
);
3490 /* these cannot be set */
3496 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3500 static struct md_sysfs_entry md_array_state
=
3501 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3504 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3505 return sprintf(page
, "%d\n",
3506 atomic_read(&mddev
->max_corr_read_errors
));
3510 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3513 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3515 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3516 atomic_set(&mddev
->max_corr_read_errors
, n
);
3522 static struct md_sysfs_entry max_corr_read_errors
=
3523 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3524 max_corrected_read_errors_store
);
3527 null_show(mddev_t
*mddev
, char *page
)
3533 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3535 /* buf must be %d:%d\n? giving major and minor numbers */
3536 /* The new device is added to the array.
3537 * If the array has a persistent superblock, we read the
3538 * superblock to initialise info and check validity.
3539 * Otherwise, only checking done is that in bind_rdev_to_array,
3540 * which mainly checks size.
3543 int major
= simple_strtoul(buf
, &e
, 10);
3549 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3551 minor
= simple_strtoul(e
+1, &e
, 10);
3552 if (*e
&& *e
!= '\n')
3554 dev
= MKDEV(major
, minor
);
3555 if (major
!= MAJOR(dev
) ||
3556 minor
!= MINOR(dev
))
3560 if (mddev
->persistent
) {
3561 rdev
= md_import_device(dev
, mddev
->major_version
,
3562 mddev
->minor_version
);
3563 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3564 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3565 mdk_rdev_t
, same_set
);
3566 err
= super_types
[mddev
->major_version
]
3567 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3571 } else if (mddev
->external
)
3572 rdev
= md_import_device(dev
, -2, -1);
3574 rdev
= md_import_device(dev
, -1, -1);
3577 return PTR_ERR(rdev
);
3578 err
= bind_rdev_to_array(rdev
, mddev
);
3582 return err
? err
: len
;
3585 static struct md_sysfs_entry md_new_device
=
3586 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3589 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3592 unsigned long chunk
, end_chunk
;
3596 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3598 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3599 if (buf
== end
) break;
3600 if (*end
== '-') { /* range */
3602 end_chunk
= simple_strtoul(buf
, &end
, 0);
3603 if (buf
== end
) break;
3605 if (*end
&& !isspace(*end
)) break;
3606 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3607 buf
= skip_spaces(end
);
3609 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3614 static struct md_sysfs_entry md_bitmap
=
3615 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3618 size_show(mddev_t
*mddev
, char *page
)
3620 return sprintf(page
, "%llu\n",
3621 (unsigned long long)mddev
->dev_sectors
/ 2);
3624 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3627 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3629 /* If array is inactive, we can reduce the component size, but
3630 * not increase it (except from 0).
3631 * If array is active, we can try an on-line resize
3634 int err
= strict_blocks_to_sectors(buf
, §ors
);
3639 err
= update_size(mddev
, sectors
);
3640 md_update_sb(mddev
, 1);
3642 if (mddev
->dev_sectors
== 0 ||
3643 mddev
->dev_sectors
> sectors
)
3644 mddev
->dev_sectors
= sectors
;
3648 return err
? err
: len
;
3651 static struct md_sysfs_entry md_size
=
3652 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3657 * 'none' for arrays with no metadata (good luck...)
3658 * 'external' for arrays with externally managed metadata,
3659 * or N.M for internally known formats
3662 metadata_show(mddev_t
*mddev
, char *page
)
3664 if (mddev
->persistent
)
3665 return sprintf(page
, "%d.%d\n",
3666 mddev
->major_version
, mddev
->minor_version
);
3667 else if (mddev
->external
)
3668 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3670 return sprintf(page
, "none\n");
3674 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3678 /* Changing the details of 'external' metadata is
3679 * always permitted. Otherwise there must be
3680 * no devices attached to the array.
3682 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3684 else if (!list_empty(&mddev
->disks
))
3687 if (cmd_match(buf
, "none")) {
3688 mddev
->persistent
= 0;
3689 mddev
->external
= 0;
3690 mddev
->major_version
= 0;
3691 mddev
->minor_version
= 90;
3694 if (strncmp(buf
, "external:", 9) == 0) {
3695 size_t namelen
= len
-9;
3696 if (namelen
>= sizeof(mddev
->metadata_type
))
3697 namelen
= sizeof(mddev
->metadata_type
)-1;
3698 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3699 mddev
->metadata_type
[namelen
] = 0;
3700 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3701 mddev
->metadata_type
[--namelen
] = 0;
3702 mddev
->persistent
= 0;
3703 mddev
->external
= 1;
3704 mddev
->major_version
= 0;
3705 mddev
->minor_version
= 90;
3708 major
= simple_strtoul(buf
, &e
, 10);
3709 if (e
==buf
|| *e
!= '.')
3712 minor
= simple_strtoul(buf
, &e
, 10);
3713 if (e
==buf
|| (*e
&& *e
!= '\n') )
3715 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3717 mddev
->major_version
= major
;
3718 mddev
->minor_version
= minor
;
3719 mddev
->persistent
= 1;
3720 mddev
->external
= 0;
3724 static struct md_sysfs_entry md_metadata
=
3725 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3728 action_show(mddev_t
*mddev
, char *page
)
3730 char *type
= "idle";
3731 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3733 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3734 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3735 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3737 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3738 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3740 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3744 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3747 return sprintf(page
, "%s\n", type
);
3750 static void reap_sync_thread(mddev_t
*mddev
);
3753 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3755 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3758 if (cmd_match(page
, "frozen"))
3759 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3761 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3763 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3764 if (mddev
->sync_thread
) {
3765 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3766 reap_sync_thread(mddev
);
3768 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3769 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3771 else if (cmd_match(page
, "resync"))
3772 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3773 else if (cmd_match(page
, "recover")) {
3774 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3775 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3776 } else if (cmd_match(page
, "reshape")) {
3778 if (mddev
->pers
->start_reshape
== NULL
)
3780 err
= mddev
->pers
->start_reshape(mddev
);
3783 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3785 if (cmd_match(page
, "check"))
3786 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3787 else if (!cmd_match(page
, "repair"))
3789 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3790 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3792 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3793 md_wakeup_thread(mddev
->thread
);
3794 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3799 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3801 return sprintf(page
, "%llu\n",
3802 (unsigned long long) mddev
->resync_mismatches
);
3805 static struct md_sysfs_entry md_scan_mode
=
3806 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3809 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3812 sync_min_show(mddev_t
*mddev
, char *page
)
3814 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3815 mddev
->sync_speed_min
? "local": "system");
3819 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3823 if (strncmp(buf
, "system", 6)==0) {
3824 mddev
->sync_speed_min
= 0;
3827 min
= simple_strtoul(buf
, &e
, 10);
3828 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3830 mddev
->sync_speed_min
= min
;
3834 static struct md_sysfs_entry md_sync_min
=
3835 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3838 sync_max_show(mddev_t
*mddev
, char *page
)
3840 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3841 mddev
->sync_speed_max
? "local": "system");
3845 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3849 if (strncmp(buf
, "system", 6)==0) {
3850 mddev
->sync_speed_max
= 0;
3853 max
= simple_strtoul(buf
, &e
, 10);
3854 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3856 mddev
->sync_speed_max
= max
;
3860 static struct md_sysfs_entry md_sync_max
=
3861 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3864 degraded_show(mddev_t
*mddev
, char *page
)
3866 return sprintf(page
, "%d\n", mddev
->degraded
);
3868 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3871 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3873 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3877 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3881 if (strict_strtol(buf
, 10, &n
))
3884 if (n
!= 0 && n
!= 1)
3887 mddev
->parallel_resync
= n
;
3889 if (mddev
->sync_thread
)
3890 wake_up(&resync_wait
);
3895 /* force parallel resync, even with shared block devices */
3896 static struct md_sysfs_entry md_sync_force_parallel
=
3897 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3898 sync_force_parallel_show
, sync_force_parallel_store
);
3901 sync_speed_show(mddev_t
*mddev
, char *page
)
3903 unsigned long resync
, dt
, db
;
3904 if (mddev
->curr_resync
== 0)
3905 return sprintf(page
, "none\n");
3906 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3907 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3909 db
= resync
- mddev
->resync_mark_cnt
;
3910 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3913 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3916 sync_completed_show(mddev_t
*mddev
, char *page
)
3918 unsigned long long max_sectors
, resync
;
3920 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3921 return sprintf(page
, "none\n");
3923 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3924 max_sectors
= mddev
->resync_max_sectors
;
3926 max_sectors
= mddev
->dev_sectors
;
3928 resync
= mddev
->curr_resync_completed
;
3929 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
3932 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3935 min_sync_show(mddev_t
*mddev
, char *page
)
3937 return sprintf(page
, "%llu\n",
3938 (unsigned long long)mddev
->resync_min
);
3941 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3943 unsigned long long min
;
3944 if (strict_strtoull(buf
, 10, &min
))
3946 if (min
> mddev
->resync_max
)
3948 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3951 /* Must be a multiple of chunk_size */
3952 if (mddev
->chunk_sectors
) {
3953 sector_t temp
= min
;
3954 if (sector_div(temp
, mddev
->chunk_sectors
))
3957 mddev
->resync_min
= min
;
3962 static struct md_sysfs_entry md_min_sync
=
3963 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3966 max_sync_show(mddev_t
*mddev
, char *page
)
3968 if (mddev
->resync_max
== MaxSector
)
3969 return sprintf(page
, "max\n");
3971 return sprintf(page
, "%llu\n",
3972 (unsigned long long)mddev
->resync_max
);
3975 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3977 if (strncmp(buf
, "max", 3) == 0)
3978 mddev
->resync_max
= MaxSector
;
3980 unsigned long long max
;
3981 if (strict_strtoull(buf
, 10, &max
))
3983 if (max
< mddev
->resync_min
)
3985 if (max
< mddev
->resync_max
&&
3987 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3990 /* Must be a multiple of chunk_size */
3991 if (mddev
->chunk_sectors
) {
3992 sector_t temp
= max
;
3993 if (sector_div(temp
, mddev
->chunk_sectors
))
3996 mddev
->resync_max
= max
;
3998 wake_up(&mddev
->recovery_wait
);
4002 static struct md_sysfs_entry md_max_sync
=
4003 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4006 suspend_lo_show(mddev_t
*mddev
, char *page
)
4008 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4012 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4015 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4016 unsigned long long old
= mddev
->suspend_lo
;
4018 if (mddev
->pers
== NULL
||
4019 mddev
->pers
->quiesce
== NULL
)
4021 if (buf
== e
|| (*e
&& *e
!= '\n'))
4024 mddev
->suspend_lo
= new;
4026 /* Shrinking suspended region */
4027 mddev
->pers
->quiesce(mddev
, 2);
4029 /* Expanding suspended region - need to wait */
4030 mddev
->pers
->quiesce(mddev
, 1);
4031 mddev
->pers
->quiesce(mddev
, 0);
4035 static struct md_sysfs_entry md_suspend_lo
=
4036 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4040 suspend_hi_show(mddev_t
*mddev
, char *page
)
4042 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4046 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4049 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4050 unsigned long long old
= mddev
->suspend_hi
;
4052 if (mddev
->pers
== NULL
||
4053 mddev
->pers
->quiesce
== NULL
)
4055 if (buf
== e
|| (*e
&& *e
!= '\n'))
4058 mddev
->suspend_hi
= new;
4060 /* Shrinking suspended region */
4061 mddev
->pers
->quiesce(mddev
, 2);
4063 /* Expanding suspended region - need to wait */
4064 mddev
->pers
->quiesce(mddev
, 1);
4065 mddev
->pers
->quiesce(mddev
, 0);
4069 static struct md_sysfs_entry md_suspend_hi
=
4070 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4073 reshape_position_show(mddev_t
*mddev
, char *page
)
4075 if (mddev
->reshape_position
!= MaxSector
)
4076 return sprintf(page
, "%llu\n",
4077 (unsigned long long)mddev
->reshape_position
);
4078 strcpy(page
, "none\n");
4083 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4086 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4089 if (buf
== e
|| (*e
&& *e
!= '\n'))
4091 mddev
->reshape_position
= new;
4092 mddev
->delta_disks
= 0;
4093 mddev
->new_level
= mddev
->level
;
4094 mddev
->new_layout
= mddev
->layout
;
4095 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4099 static struct md_sysfs_entry md_reshape_position
=
4100 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4101 reshape_position_store
);
4104 array_size_show(mddev_t
*mddev
, char *page
)
4106 if (mddev
->external_size
)
4107 return sprintf(page
, "%llu\n",
4108 (unsigned long long)mddev
->array_sectors
/2);
4110 return sprintf(page
, "default\n");
4114 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4118 if (strncmp(buf
, "default", 7) == 0) {
4120 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4122 sectors
= mddev
->array_sectors
;
4124 mddev
->external_size
= 0;
4126 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4128 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4131 mddev
->external_size
= 1;
4134 mddev
->array_sectors
= sectors
;
4135 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4137 revalidate_disk(mddev
->gendisk
);
4142 static struct md_sysfs_entry md_array_size
=
4143 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4146 static struct attribute
*md_default_attrs
[] = {
4149 &md_raid_disks
.attr
,
4150 &md_chunk_size
.attr
,
4152 &md_resync_start
.attr
,
4154 &md_new_device
.attr
,
4155 &md_safe_delay
.attr
,
4156 &md_array_state
.attr
,
4157 &md_reshape_position
.attr
,
4158 &md_array_size
.attr
,
4159 &max_corr_read_errors
.attr
,
4163 static struct attribute
*md_redundancy_attrs
[] = {
4165 &md_mismatches
.attr
,
4168 &md_sync_speed
.attr
,
4169 &md_sync_force_parallel
.attr
,
4170 &md_sync_completed
.attr
,
4173 &md_suspend_lo
.attr
,
4174 &md_suspend_hi
.attr
,
4179 static struct attribute_group md_redundancy_group
= {
4181 .attrs
= md_redundancy_attrs
,
4186 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4188 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4189 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4194 rv
= mddev_lock(mddev
);
4196 rv
= entry
->show(mddev
, page
);
4197 mddev_unlock(mddev
);
4203 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4204 const char *page
, size_t length
)
4206 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4207 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4212 if (!capable(CAP_SYS_ADMIN
))
4214 rv
= mddev_lock(mddev
);
4215 if (mddev
->hold_active
== UNTIL_IOCTL
)
4216 mddev
->hold_active
= 0;
4218 rv
= entry
->store(mddev
, page
, length
);
4219 mddev_unlock(mddev
);
4224 static void md_free(struct kobject
*ko
)
4226 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4228 if (mddev
->sysfs_state
)
4229 sysfs_put(mddev
->sysfs_state
);
4231 if (mddev
->gendisk
) {
4232 del_gendisk(mddev
->gendisk
);
4233 put_disk(mddev
->gendisk
);
4236 blk_cleanup_queue(mddev
->queue
);
4241 static const struct sysfs_ops md_sysfs_ops
= {
4242 .show
= md_attr_show
,
4243 .store
= md_attr_store
,
4245 static struct kobj_type md_ktype
= {
4247 .sysfs_ops
= &md_sysfs_ops
,
4248 .default_attrs
= md_default_attrs
,
4253 static void mddev_delayed_delete(struct work_struct
*ws
)
4255 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4257 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4258 kobject_del(&mddev
->kobj
);
4259 kobject_put(&mddev
->kobj
);
4262 static int md_alloc(dev_t dev
, char *name
)
4264 static DEFINE_MUTEX(disks_mutex
);
4265 mddev_t
*mddev
= mddev_find(dev
);
4266 struct gendisk
*disk
;
4275 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4276 shift
= partitioned
? MdpMinorShift
: 0;
4277 unit
= MINOR(mddev
->unit
) >> shift
;
4279 /* wait for any previous instance of this device to be
4280 * completely removed (mddev_delayed_delete).
4282 flush_workqueue(md_misc_wq
);
4284 mutex_lock(&disks_mutex
);
4290 /* Need to ensure that 'name' is not a duplicate.
4293 spin_lock(&all_mddevs_lock
);
4295 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4296 if (mddev2
->gendisk
&&
4297 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4298 spin_unlock(&all_mddevs_lock
);
4301 spin_unlock(&all_mddevs_lock
);
4305 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4308 mddev
->queue
->queuedata
= mddev
;
4310 blk_queue_make_request(mddev
->queue
, md_make_request
);
4312 disk
= alloc_disk(1 << shift
);
4314 blk_cleanup_queue(mddev
->queue
);
4315 mddev
->queue
= NULL
;
4318 disk
->major
= MAJOR(mddev
->unit
);
4319 disk
->first_minor
= unit
<< shift
;
4321 strcpy(disk
->disk_name
, name
);
4322 else if (partitioned
)
4323 sprintf(disk
->disk_name
, "md_d%d", unit
);
4325 sprintf(disk
->disk_name
, "md%d", unit
);
4326 disk
->fops
= &md_fops
;
4327 disk
->private_data
= mddev
;
4328 disk
->queue
= mddev
->queue
;
4329 /* Allow extended partitions. This makes the
4330 * 'mdp' device redundant, but we can't really
4333 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4335 mddev
->gendisk
= disk
;
4336 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4337 &disk_to_dev(disk
)->kobj
, "%s", "md");
4339 /* This isn't possible, but as kobject_init_and_add is marked
4340 * __must_check, we must do something with the result
4342 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4346 if (mddev
->kobj
.sd
&&
4347 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4348 printk(KERN_DEBUG
"pointless warning\n");
4350 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4352 mutex_unlock(&disks_mutex
);
4353 if (!error
&& mddev
->kobj
.sd
) {
4354 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4355 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4361 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4363 md_alloc(dev
, NULL
);
4367 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4369 /* val must be "md_*" where * is not all digits.
4370 * We allocate an array with a large free minor number, and
4371 * set the name to val. val must not already be an active name.
4373 int len
= strlen(val
);
4374 char buf
[DISK_NAME_LEN
];
4376 while (len
&& val
[len
-1] == '\n')
4378 if (len
>= DISK_NAME_LEN
)
4380 strlcpy(buf
, val
, len
+1);
4381 if (strncmp(buf
, "md_", 3) != 0)
4383 return md_alloc(0, buf
);
4386 static void md_safemode_timeout(unsigned long data
)
4388 mddev_t
*mddev
= (mddev_t
*) data
;
4390 if (!atomic_read(&mddev
->writes_pending
)) {
4391 mddev
->safemode
= 1;
4392 if (mddev
->external
)
4393 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4395 md_wakeup_thread(mddev
->thread
);
4398 static int start_dirty_degraded
;
4400 int md_run(mddev_t
*mddev
)
4404 struct mdk_personality
*pers
;
4406 if (list_empty(&mddev
->disks
))
4407 /* cannot run an array with no devices.. */
4412 /* Cannot run until previous stop completes properly */
4413 if (mddev
->sysfs_active
)
4417 * Analyze all RAID superblock(s)
4419 if (!mddev
->raid_disks
) {
4420 if (!mddev
->persistent
)
4425 if (mddev
->level
!= LEVEL_NONE
)
4426 request_module("md-level-%d", mddev
->level
);
4427 else if (mddev
->clevel
[0])
4428 request_module("md-%s", mddev
->clevel
);
4431 * Drop all container device buffers, from now on
4432 * the only valid external interface is through the md
4435 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4436 if (test_bit(Faulty
, &rdev
->flags
))
4438 sync_blockdev(rdev
->bdev
);
4439 invalidate_bdev(rdev
->bdev
);
4441 /* perform some consistency tests on the device.
4442 * We don't want the data to overlap the metadata,
4443 * Internal Bitmap issues have been handled elsewhere.
4445 if (rdev
->meta_bdev
) {
4446 /* Nothing to check */;
4447 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4448 if (mddev
->dev_sectors
&&
4449 rdev
->data_offset
+ mddev
->dev_sectors
4451 printk("md: %s: data overlaps metadata\n",
4456 if (rdev
->sb_start
+ rdev
->sb_size
/512
4457 > rdev
->data_offset
) {
4458 printk("md: %s: metadata overlaps data\n",
4463 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4466 if (mddev
->bio_set
== NULL
)
4467 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, sizeof(mddev
));
4469 spin_lock(&pers_lock
);
4470 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4471 if (!pers
|| !try_module_get(pers
->owner
)) {
4472 spin_unlock(&pers_lock
);
4473 if (mddev
->level
!= LEVEL_NONE
)
4474 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4477 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4482 spin_unlock(&pers_lock
);
4483 if (mddev
->level
!= pers
->level
) {
4484 mddev
->level
= pers
->level
;
4485 mddev
->new_level
= pers
->level
;
4487 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4489 if (mddev
->reshape_position
!= MaxSector
&&
4490 pers
->start_reshape
== NULL
) {
4491 /* This personality cannot handle reshaping... */
4493 module_put(pers
->owner
);
4497 if (pers
->sync_request
) {
4498 /* Warn if this is a potentially silly
4501 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4505 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4506 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4508 rdev
->bdev
->bd_contains
==
4509 rdev2
->bdev
->bd_contains
) {
4511 "%s: WARNING: %s appears to be"
4512 " on the same physical disk as"
4515 bdevname(rdev
->bdev
,b
),
4516 bdevname(rdev2
->bdev
,b2
));
4523 "True protection against single-disk"
4524 " failure might be compromised.\n");
4527 mddev
->recovery
= 0;
4528 /* may be over-ridden by personality */
4529 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4531 mddev
->ok_start_degraded
= start_dirty_degraded
;
4533 if (start_readonly
&& mddev
->ro
== 0)
4534 mddev
->ro
= 2; /* read-only, but switch on first write */
4536 err
= mddev
->pers
->run(mddev
);
4538 printk(KERN_ERR
"md: pers->run() failed ...\n");
4539 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4540 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4541 " but 'external_size' not in effect?\n", __func__
);
4543 "md: invalid array_size %llu > default size %llu\n",
4544 (unsigned long long)mddev
->array_sectors
/ 2,
4545 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4547 mddev
->pers
->stop(mddev
);
4549 if (err
== 0 && mddev
->pers
->sync_request
) {
4550 err
= bitmap_create(mddev
);
4552 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4553 mdname(mddev
), err
);
4554 mddev
->pers
->stop(mddev
);
4558 module_put(mddev
->pers
->owner
);
4560 bitmap_destroy(mddev
);
4563 if (mddev
->pers
->sync_request
) {
4564 if (mddev
->kobj
.sd
&&
4565 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4567 "md: cannot register extra attributes for %s\n",
4569 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4570 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4573 atomic_set(&mddev
->writes_pending
,0);
4574 atomic_set(&mddev
->max_corr_read_errors
,
4575 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4576 mddev
->safemode
= 0;
4577 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4578 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4579 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4583 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4584 if (rdev
->raid_disk
>= 0) {
4586 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4587 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4588 /* failure here is OK */;
4591 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4594 md_update_sb(mddev
, 0);
4596 md_wakeup_thread(mddev
->thread
);
4597 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4599 md_new_event(mddev
);
4600 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4601 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4602 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4605 EXPORT_SYMBOL_GPL(md_run
);
4607 static int do_md_run(mddev_t
*mddev
)
4611 err
= md_run(mddev
);
4614 err
= bitmap_load(mddev
);
4616 bitmap_destroy(mddev
);
4619 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4620 revalidate_disk(mddev
->gendisk
);
4621 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4626 static int restart_array(mddev_t
*mddev
)
4628 struct gendisk
*disk
= mddev
->gendisk
;
4630 /* Complain if it has no devices */
4631 if (list_empty(&mddev
->disks
))
4637 mddev
->safemode
= 0;
4639 set_disk_ro(disk
, 0);
4640 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4642 /* Kick recovery or resync if necessary */
4643 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4644 md_wakeup_thread(mddev
->thread
);
4645 md_wakeup_thread(mddev
->sync_thread
);
4646 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4650 /* similar to deny_write_access, but accounts for our holding a reference
4651 * to the file ourselves */
4652 static int deny_bitmap_write_access(struct file
* file
)
4654 struct inode
*inode
= file
->f_mapping
->host
;
4656 spin_lock(&inode
->i_lock
);
4657 if (atomic_read(&inode
->i_writecount
) > 1) {
4658 spin_unlock(&inode
->i_lock
);
4661 atomic_set(&inode
->i_writecount
, -1);
4662 spin_unlock(&inode
->i_lock
);
4667 void restore_bitmap_write_access(struct file
*file
)
4669 struct inode
*inode
= file
->f_mapping
->host
;
4671 spin_lock(&inode
->i_lock
);
4672 atomic_set(&inode
->i_writecount
, 1);
4673 spin_unlock(&inode
->i_lock
);
4676 static void md_clean(mddev_t
*mddev
)
4678 mddev
->array_sectors
= 0;
4679 mddev
->external_size
= 0;
4680 mddev
->dev_sectors
= 0;
4681 mddev
->raid_disks
= 0;
4682 mddev
->recovery_cp
= 0;
4683 mddev
->resync_min
= 0;
4684 mddev
->resync_max
= MaxSector
;
4685 mddev
->reshape_position
= MaxSector
;
4686 mddev
->external
= 0;
4687 mddev
->persistent
= 0;
4688 mddev
->level
= LEVEL_NONE
;
4689 mddev
->clevel
[0] = 0;
4692 mddev
->metadata_type
[0] = 0;
4693 mddev
->chunk_sectors
= 0;
4694 mddev
->ctime
= mddev
->utime
= 0;
4696 mddev
->max_disks
= 0;
4698 mddev
->can_decrease_events
= 0;
4699 mddev
->delta_disks
= 0;
4700 mddev
->new_level
= LEVEL_NONE
;
4701 mddev
->new_layout
= 0;
4702 mddev
->new_chunk_sectors
= 0;
4703 mddev
->curr_resync
= 0;
4704 mddev
->resync_mismatches
= 0;
4705 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4706 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4707 mddev
->recovery
= 0;
4709 mddev
->degraded
= 0;
4710 mddev
->safemode
= 0;
4711 mddev
->bitmap_info
.offset
= 0;
4712 mddev
->bitmap_info
.default_offset
= 0;
4713 mddev
->bitmap_info
.chunksize
= 0;
4714 mddev
->bitmap_info
.daemon_sleep
= 0;
4715 mddev
->bitmap_info
.max_write_behind
= 0;
4719 static void __md_stop_writes(mddev_t
*mddev
)
4721 if (mddev
->sync_thread
) {
4722 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4723 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4724 reap_sync_thread(mddev
);
4727 del_timer_sync(&mddev
->safemode_timer
);
4729 bitmap_flush(mddev
);
4730 md_super_wait(mddev
);
4732 if (!mddev
->in_sync
|| mddev
->flags
) {
4733 /* mark array as shutdown cleanly */
4735 md_update_sb(mddev
, 1);
4739 void md_stop_writes(mddev_t
*mddev
)
4742 __md_stop_writes(mddev
);
4743 mddev_unlock(mddev
);
4745 EXPORT_SYMBOL_GPL(md_stop_writes
);
4747 void md_stop(mddev_t
*mddev
)
4750 mddev
->pers
->stop(mddev
);
4751 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4752 mddev
->to_remove
= &md_redundancy_group
;
4753 module_put(mddev
->pers
->owner
);
4755 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4757 EXPORT_SYMBOL_GPL(md_stop
);
4759 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4762 mutex_lock(&mddev
->open_mutex
);
4763 if (atomic_read(&mddev
->openers
) > is_open
) {
4764 printk("md: %s still in use.\n",mdname(mddev
));
4769 __md_stop_writes(mddev
);
4775 set_disk_ro(mddev
->gendisk
, 1);
4776 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4777 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4781 mutex_unlock(&mddev
->open_mutex
);
4786 * 0 - completely stop and dis-assemble array
4787 * 2 - stop but do not disassemble array
4789 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4791 struct gendisk
*disk
= mddev
->gendisk
;
4794 mutex_lock(&mddev
->open_mutex
);
4795 if (atomic_read(&mddev
->openers
) > is_open
||
4796 mddev
->sysfs_active
) {
4797 printk("md: %s still in use.\n",mdname(mddev
));
4798 mutex_unlock(&mddev
->open_mutex
);
4804 set_disk_ro(disk
, 0);
4806 __md_stop_writes(mddev
);
4808 mddev
->queue
->merge_bvec_fn
= NULL
;
4809 mddev
->queue
->unplug_fn
= NULL
;
4810 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4812 /* tell userspace to handle 'inactive' */
4813 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4815 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4816 if (rdev
->raid_disk
>= 0) {
4818 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4819 sysfs_remove_link(&mddev
->kobj
, nm
);
4822 set_capacity(disk
, 0);
4823 mutex_unlock(&mddev
->open_mutex
);
4824 revalidate_disk(disk
);
4829 mutex_unlock(&mddev
->open_mutex
);
4831 * Free resources if final stop
4834 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4836 bitmap_destroy(mddev
);
4837 if (mddev
->bitmap_info
.file
) {
4838 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4839 fput(mddev
->bitmap_info
.file
);
4840 mddev
->bitmap_info
.file
= NULL
;
4842 mddev
->bitmap_info
.offset
= 0;
4844 export_array(mddev
);
4847 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4848 if (mddev
->hold_active
== UNTIL_STOP
)
4849 mddev
->hold_active
= 0;
4851 blk_integrity_unregister(disk
);
4852 md_new_event(mddev
);
4853 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4858 static void autorun_array(mddev_t
*mddev
)
4863 if (list_empty(&mddev
->disks
))
4866 printk(KERN_INFO
"md: running: ");
4868 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4869 char b
[BDEVNAME_SIZE
];
4870 printk("<%s>", bdevname(rdev
->bdev
,b
));
4874 err
= do_md_run(mddev
);
4876 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4877 do_md_stop(mddev
, 0, 0);
4882 * lets try to run arrays based on all disks that have arrived
4883 * until now. (those are in pending_raid_disks)
4885 * the method: pick the first pending disk, collect all disks with
4886 * the same UUID, remove all from the pending list and put them into
4887 * the 'same_array' list. Then order this list based on superblock
4888 * update time (freshest comes first), kick out 'old' disks and
4889 * compare superblocks. If everything's fine then run it.
4891 * If "unit" is allocated, then bump its reference count
4893 static void autorun_devices(int part
)
4895 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4897 char b
[BDEVNAME_SIZE
];
4899 printk(KERN_INFO
"md: autorun ...\n");
4900 while (!list_empty(&pending_raid_disks
)) {
4903 LIST_HEAD(candidates
);
4904 rdev0
= list_entry(pending_raid_disks
.next
,
4905 mdk_rdev_t
, same_set
);
4907 printk(KERN_INFO
"md: considering %s ...\n",
4908 bdevname(rdev0
->bdev
,b
));
4909 INIT_LIST_HEAD(&candidates
);
4910 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4911 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4912 printk(KERN_INFO
"md: adding %s ...\n",
4913 bdevname(rdev
->bdev
,b
));
4914 list_move(&rdev
->same_set
, &candidates
);
4917 * now we have a set of devices, with all of them having
4918 * mostly sane superblocks. It's time to allocate the
4922 dev
= MKDEV(mdp_major
,
4923 rdev0
->preferred_minor
<< MdpMinorShift
);
4924 unit
= MINOR(dev
) >> MdpMinorShift
;
4926 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4929 if (rdev0
->preferred_minor
!= unit
) {
4930 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4931 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4935 md_probe(dev
, NULL
, NULL
);
4936 mddev
= mddev_find(dev
);
4937 if (!mddev
|| !mddev
->gendisk
) {
4941 "md: cannot allocate memory for md drive.\n");
4944 if (mddev_lock(mddev
))
4945 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4947 else if (mddev
->raid_disks
|| mddev
->major_version
4948 || !list_empty(&mddev
->disks
)) {
4950 "md: %s already running, cannot run %s\n",
4951 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4952 mddev_unlock(mddev
);
4954 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4955 mddev
->persistent
= 1;
4956 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4957 list_del_init(&rdev
->same_set
);
4958 if (bind_rdev_to_array(rdev
, mddev
))
4961 autorun_array(mddev
);
4962 mddev_unlock(mddev
);
4964 /* on success, candidates will be empty, on error
4967 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4968 list_del_init(&rdev
->same_set
);
4973 printk(KERN_INFO
"md: ... autorun DONE.\n");
4975 #endif /* !MODULE */
4977 static int get_version(void __user
* arg
)
4981 ver
.major
= MD_MAJOR_VERSION
;
4982 ver
.minor
= MD_MINOR_VERSION
;
4983 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4985 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4991 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4993 mdu_array_info_t info
;
4994 int nr
,working
,insync
,failed
,spare
;
4997 nr
=working
=insync
=failed
=spare
=0;
4998 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5000 if (test_bit(Faulty
, &rdev
->flags
))
5004 if (test_bit(In_sync
, &rdev
->flags
))
5011 info
.major_version
= mddev
->major_version
;
5012 info
.minor_version
= mddev
->minor_version
;
5013 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5014 info
.ctime
= mddev
->ctime
;
5015 info
.level
= mddev
->level
;
5016 info
.size
= mddev
->dev_sectors
/ 2;
5017 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5020 info
.raid_disks
= mddev
->raid_disks
;
5021 info
.md_minor
= mddev
->md_minor
;
5022 info
.not_persistent
= !mddev
->persistent
;
5024 info
.utime
= mddev
->utime
;
5027 info
.state
= (1<<MD_SB_CLEAN
);
5028 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5029 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5030 info
.active_disks
= insync
;
5031 info
.working_disks
= working
;
5032 info
.failed_disks
= failed
;
5033 info
.spare_disks
= spare
;
5035 info
.layout
= mddev
->layout
;
5036 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5038 if (copy_to_user(arg
, &info
, sizeof(info
)))
5044 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
5046 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5047 char *ptr
, *buf
= NULL
;
5050 if (md_allow_write(mddev
))
5051 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5053 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5058 /* bitmap disabled, zero the first byte and copy out */
5059 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5060 file
->pathname
[0] = '\0';
5064 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5068 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5072 strcpy(file
->pathname
, ptr
);
5076 if (copy_to_user(arg
, file
, sizeof(*file
)))
5084 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5086 mdu_disk_info_t info
;
5089 if (copy_from_user(&info
, arg
, sizeof(info
)))
5092 rdev
= find_rdev_nr(mddev
, info
.number
);
5094 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5095 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5096 info
.raid_disk
= rdev
->raid_disk
;
5098 if (test_bit(Faulty
, &rdev
->flags
))
5099 info
.state
|= (1<<MD_DISK_FAULTY
);
5100 else if (test_bit(In_sync
, &rdev
->flags
)) {
5101 info
.state
|= (1<<MD_DISK_ACTIVE
);
5102 info
.state
|= (1<<MD_DISK_SYNC
);
5104 if (test_bit(WriteMostly
, &rdev
->flags
))
5105 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5107 info
.major
= info
.minor
= 0;
5108 info
.raid_disk
= -1;
5109 info
.state
= (1<<MD_DISK_REMOVED
);
5112 if (copy_to_user(arg
, &info
, sizeof(info
)))
5118 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5120 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5122 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5124 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5127 if (!mddev
->raid_disks
) {
5129 /* expecting a device which has a superblock */
5130 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5133 "md: md_import_device returned %ld\n",
5135 return PTR_ERR(rdev
);
5137 if (!list_empty(&mddev
->disks
)) {
5138 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5139 mdk_rdev_t
, same_set
);
5140 err
= super_types
[mddev
->major_version
]
5141 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5144 "md: %s has different UUID to %s\n",
5145 bdevname(rdev
->bdev
,b
),
5146 bdevname(rdev0
->bdev
,b2
));
5151 err
= bind_rdev_to_array(rdev
, mddev
);
5158 * add_new_disk can be used once the array is assembled
5159 * to add "hot spares". They must already have a superblock
5164 if (!mddev
->pers
->hot_add_disk
) {
5166 "%s: personality does not support diskops!\n",
5170 if (mddev
->persistent
)
5171 rdev
= md_import_device(dev
, mddev
->major_version
,
5172 mddev
->minor_version
);
5174 rdev
= md_import_device(dev
, -1, -1);
5177 "md: md_import_device returned %ld\n",
5179 return PTR_ERR(rdev
);
5181 /* set saved_raid_disk if appropriate */
5182 if (!mddev
->persistent
) {
5183 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5184 info
->raid_disk
< mddev
->raid_disks
) {
5185 rdev
->raid_disk
= info
->raid_disk
;
5186 set_bit(In_sync
, &rdev
->flags
);
5188 rdev
->raid_disk
= -1;
5190 super_types
[mddev
->major_version
].
5191 validate_super(mddev
, rdev
);
5192 if (test_bit(In_sync
, &rdev
->flags
))
5193 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5195 rdev
->saved_raid_disk
= -1;
5197 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5198 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5199 set_bit(WriteMostly
, &rdev
->flags
);
5201 clear_bit(WriteMostly
, &rdev
->flags
);
5203 rdev
->raid_disk
= -1;
5204 err
= bind_rdev_to_array(rdev
, mddev
);
5205 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5206 /* If there is hot_add_disk but no hot_remove_disk
5207 * then added disks for geometry changes,
5208 * and should be added immediately.
5210 super_types
[mddev
->major_version
].
5211 validate_super(mddev
, rdev
);
5212 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5214 unbind_rdev_from_array(rdev
);
5219 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5221 md_update_sb(mddev
, 1);
5222 if (mddev
->degraded
)
5223 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5224 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5225 md_wakeup_thread(mddev
->thread
);
5229 /* otherwise, add_new_disk is only allowed
5230 * for major_version==0 superblocks
5232 if (mddev
->major_version
!= 0) {
5233 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5238 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5240 rdev
= md_import_device(dev
, -1, 0);
5243 "md: error, md_import_device() returned %ld\n",
5245 return PTR_ERR(rdev
);
5247 rdev
->desc_nr
= info
->number
;
5248 if (info
->raid_disk
< mddev
->raid_disks
)
5249 rdev
->raid_disk
= info
->raid_disk
;
5251 rdev
->raid_disk
= -1;
5253 if (rdev
->raid_disk
< mddev
->raid_disks
)
5254 if (info
->state
& (1<<MD_DISK_SYNC
))
5255 set_bit(In_sync
, &rdev
->flags
);
5257 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5258 set_bit(WriteMostly
, &rdev
->flags
);
5260 if (!mddev
->persistent
) {
5261 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5262 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5264 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5265 rdev
->sectors
= rdev
->sb_start
;
5267 err
= bind_rdev_to_array(rdev
, mddev
);
5277 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5279 char b
[BDEVNAME_SIZE
];
5282 rdev
= find_rdev(mddev
, dev
);
5286 if (rdev
->raid_disk
>= 0)
5289 kick_rdev_from_array(rdev
);
5290 md_update_sb(mddev
, 1);
5291 md_new_event(mddev
);
5295 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5296 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5300 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5302 char b
[BDEVNAME_SIZE
];
5309 if (mddev
->major_version
!= 0) {
5310 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5311 " version-0 superblocks.\n",
5315 if (!mddev
->pers
->hot_add_disk
) {
5317 "%s: personality does not support diskops!\n",
5322 rdev
= md_import_device(dev
, -1, 0);
5325 "md: error, md_import_device() returned %ld\n",
5330 if (mddev
->persistent
)
5331 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5333 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5335 rdev
->sectors
= rdev
->sb_start
;
5337 if (test_bit(Faulty
, &rdev
->flags
)) {
5339 "md: can not hot-add faulty %s disk to %s!\n",
5340 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5344 clear_bit(In_sync
, &rdev
->flags
);
5346 rdev
->saved_raid_disk
= -1;
5347 err
= bind_rdev_to_array(rdev
, mddev
);
5352 * The rest should better be atomic, we can have disk failures
5353 * noticed in interrupt contexts ...
5356 rdev
->raid_disk
= -1;
5358 md_update_sb(mddev
, 1);
5361 * Kick recovery, maybe this spare has to be added to the
5362 * array immediately.
5364 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5365 md_wakeup_thread(mddev
->thread
);
5366 md_new_event(mddev
);
5374 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5379 if (!mddev
->pers
->quiesce
)
5381 if (mddev
->recovery
|| mddev
->sync_thread
)
5383 /* we should be able to change the bitmap.. */
5389 return -EEXIST
; /* cannot add when bitmap is present */
5390 mddev
->bitmap_info
.file
= fget(fd
);
5392 if (mddev
->bitmap_info
.file
== NULL
) {
5393 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5398 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5400 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5402 fput(mddev
->bitmap_info
.file
);
5403 mddev
->bitmap_info
.file
= NULL
;
5406 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5407 } else if (mddev
->bitmap
== NULL
)
5408 return -ENOENT
; /* cannot remove what isn't there */
5411 mddev
->pers
->quiesce(mddev
, 1);
5413 err
= bitmap_create(mddev
);
5415 err
= bitmap_load(mddev
);
5417 if (fd
< 0 || err
) {
5418 bitmap_destroy(mddev
);
5419 fd
= -1; /* make sure to put the file */
5421 mddev
->pers
->quiesce(mddev
, 0);
5424 if (mddev
->bitmap_info
.file
) {
5425 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5426 fput(mddev
->bitmap_info
.file
);
5428 mddev
->bitmap_info
.file
= NULL
;
5435 * set_array_info is used two different ways
5436 * The original usage is when creating a new array.
5437 * In this usage, raid_disks is > 0 and it together with
5438 * level, size, not_persistent,layout,chunksize determine the
5439 * shape of the array.
5440 * This will always create an array with a type-0.90.0 superblock.
5441 * The newer usage is when assembling an array.
5442 * In this case raid_disks will be 0, and the major_version field is
5443 * use to determine which style super-blocks are to be found on the devices.
5444 * The minor and patch _version numbers are also kept incase the
5445 * super_block handler wishes to interpret them.
5447 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5450 if (info
->raid_disks
== 0) {
5451 /* just setting version number for superblock loading */
5452 if (info
->major_version
< 0 ||
5453 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5454 super_types
[info
->major_version
].name
== NULL
) {
5455 /* maybe try to auto-load a module? */
5457 "md: superblock version %d not known\n",
5458 info
->major_version
);
5461 mddev
->major_version
= info
->major_version
;
5462 mddev
->minor_version
= info
->minor_version
;
5463 mddev
->patch_version
= info
->patch_version
;
5464 mddev
->persistent
= !info
->not_persistent
;
5465 /* ensure mddev_put doesn't delete this now that there
5466 * is some minimal configuration.
5468 mddev
->ctime
= get_seconds();
5471 mddev
->major_version
= MD_MAJOR_VERSION
;
5472 mddev
->minor_version
= MD_MINOR_VERSION
;
5473 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5474 mddev
->ctime
= get_seconds();
5476 mddev
->level
= info
->level
;
5477 mddev
->clevel
[0] = 0;
5478 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5479 mddev
->raid_disks
= info
->raid_disks
;
5480 /* don't set md_minor, it is determined by which /dev/md* was
5483 if (info
->state
& (1<<MD_SB_CLEAN
))
5484 mddev
->recovery_cp
= MaxSector
;
5486 mddev
->recovery_cp
= 0;
5487 mddev
->persistent
= ! info
->not_persistent
;
5488 mddev
->external
= 0;
5490 mddev
->layout
= info
->layout
;
5491 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5493 mddev
->max_disks
= MD_SB_DISKS
;
5495 if (mddev
->persistent
)
5497 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5499 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5500 mddev
->bitmap_info
.offset
= 0;
5502 mddev
->reshape_position
= MaxSector
;
5505 * Generate a 128 bit UUID
5507 get_random_bytes(mddev
->uuid
, 16);
5509 mddev
->new_level
= mddev
->level
;
5510 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5511 mddev
->new_layout
= mddev
->layout
;
5512 mddev
->delta_disks
= 0;
5517 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5519 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5521 if (mddev
->external_size
)
5524 mddev
->array_sectors
= array_sectors
;
5526 EXPORT_SYMBOL(md_set_array_sectors
);
5528 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5532 int fit
= (num_sectors
== 0);
5534 if (mddev
->pers
->resize
== NULL
)
5536 /* The "num_sectors" is the number of sectors of each device that
5537 * is used. This can only make sense for arrays with redundancy.
5538 * linear and raid0 always use whatever space is available. We can only
5539 * consider changing this number if no resync or reconstruction is
5540 * happening, and if the new size is acceptable. It must fit before the
5541 * sb_start or, if that is <data_offset, it must fit before the size
5542 * of each device. If num_sectors is zero, we find the largest size
5545 if (mddev
->sync_thread
)
5548 /* Sorry, cannot grow a bitmap yet, just remove it,
5552 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5553 sector_t avail
= rdev
->sectors
;
5555 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5556 num_sectors
= avail
;
5557 if (avail
< num_sectors
)
5560 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5562 revalidate_disk(mddev
->gendisk
);
5566 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5569 /* change the number of raid disks */
5570 if (mddev
->pers
->check_reshape
== NULL
)
5572 if (raid_disks
<= 0 ||
5573 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5575 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5577 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5579 rv
= mddev
->pers
->check_reshape(mddev
);
5585 * update_array_info is used to change the configuration of an
5587 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5588 * fields in the info are checked against the array.
5589 * Any differences that cannot be handled will cause an error.
5590 * Normally, only one change can be managed at a time.
5592 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5598 /* calculate expected state,ignoring low bits */
5599 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5600 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5602 if (mddev
->major_version
!= info
->major_version
||
5603 mddev
->minor_version
!= info
->minor_version
||
5604 /* mddev->patch_version != info->patch_version || */
5605 mddev
->ctime
!= info
->ctime
||
5606 mddev
->level
!= info
->level
||
5607 /* mddev->layout != info->layout || */
5608 !mddev
->persistent
!= info
->not_persistent
||
5609 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5610 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5611 ((state
^info
->state
) & 0xfffffe00)
5614 /* Check there is only one change */
5615 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5617 if (mddev
->raid_disks
!= info
->raid_disks
)
5619 if (mddev
->layout
!= info
->layout
)
5621 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5628 if (mddev
->layout
!= info
->layout
) {
5630 * we don't need to do anything at the md level, the
5631 * personality will take care of it all.
5633 if (mddev
->pers
->check_reshape
== NULL
)
5636 mddev
->new_layout
= info
->layout
;
5637 rv
= mddev
->pers
->check_reshape(mddev
);
5639 mddev
->new_layout
= mddev
->layout
;
5643 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5644 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5646 if (mddev
->raid_disks
!= info
->raid_disks
)
5647 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5649 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5650 if (mddev
->pers
->quiesce
== NULL
)
5652 if (mddev
->recovery
|| mddev
->sync_thread
)
5654 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5655 /* add the bitmap */
5658 if (mddev
->bitmap_info
.default_offset
== 0)
5660 mddev
->bitmap_info
.offset
=
5661 mddev
->bitmap_info
.default_offset
;
5662 mddev
->pers
->quiesce(mddev
, 1);
5663 rv
= bitmap_create(mddev
);
5665 rv
= bitmap_load(mddev
);
5667 bitmap_destroy(mddev
);
5668 mddev
->pers
->quiesce(mddev
, 0);
5670 /* remove the bitmap */
5673 if (mddev
->bitmap
->file
)
5675 mddev
->pers
->quiesce(mddev
, 1);
5676 bitmap_destroy(mddev
);
5677 mddev
->pers
->quiesce(mddev
, 0);
5678 mddev
->bitmap_info
.offset
= 0;
5681 md_update_sb(mddev
, 1);
5685 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5689 if (mddev
->pers
== NULL
)
5692 rdev
= find_rdev(mddev
, dev
);
5696 md_error(mddev
, rdev
);
5701 * We have a problem here : there is no easy way to give a CHS
5702 * virtual geometry. We currently pretend that we have a 2 heads
5703 * 4 sectors (with a BIG number of cylinders...). This drives
5704 * dosfs just mad... ;-)
5706 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5708 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5712 geo
->cylinders
= mddev
->array_sectors
/ 8;
5716 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5717 unsigned int cmd
, unsigned long arg
)
5720 void __user
*argp
= (void __user
*)arg
;
5721 mddev_t
*mddev
= NULL
;
5724 if (!capable(CAP_SYS_ADMIN
))
5728 * Commands dealing with the RAID driver but not any
5734 err
= get_version(argp
);
5737 case PRINT_RAID_DEBUG
:
5745 autostart_arrays(arg
);
5752 * Commands creating/starting a new array:
5755 mddev
= bdev
->bd_disk
->private_data
;
5762 err
= mddev_lock(mddev
);
5765 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5772 case SET_ARRAY_INFO
:
5774 mdu_array_info_t info
;
5776 memset(&info
, 0, sizeof(info
));
5777 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5782 err
= update_array_info(mddev
, &info
);
5784 printk(KERN_WARNING
"md: couldn't update"
5785 " array info. %d\n", err
);
5790 if (!list_empty(&mddev
->disks
)) {
5792 "md: array %s already has disks!\n",
5797 if (mddev
->raid_disks
) {
5799 "md: array %s already initialised!\n",
5804 err
= set_array_info(mddev
, &info
);
5806 printk(KERN_WARNING
"md: couldn't set"
5807 " array info. %d\n", err
);
5817 * Commands querying/configuring an existing array:
5819 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5820 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5821 if ((!mddev
->raid_disks
&& !mddev
->external
)
5822 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5823 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5824 && cmd
!= GET_BITMAP_FILE
) {
5830 * Commands even a read-only array can execute:
5834 case GET_ARRAY_INFO
:
5835 err
= get_array_info(mddev
, argp
);
5838 case GET_BITMAP_FILE
:
5839 err
= get_bitmap_file(mddev
, argp
);
5843 err
= get_disk_info(mddev
, argp
);
5846 case RESTART_ARRAY_RW
:
5847 err
= restart_array(mddev
);
5851 err
= do_md_stop(mddev
, 0, 1);
5855 err
= md_set_readonly(mddev
, 1);
5859 if (get_user(ro
, (int __user
*)(arg
))) {
5865 /* if the bdev is going readonly the value of mddev->ro
5866 * does not matter, no writes are coming
5871 /* are we are already prepared for writes? */
5875 /* transitioning to readauto need only happen for
5876 * arrays that call md_write_start
5879 err
= restart_array(mddev
);
5882 set_disk_ro(mddev
->gendisk
, 0);
5889 * The remaining ioctls are changing the state of the
5890 * superblock, so we do not allow them on read-only arrays.
5891 * However non-MD ioctls (e.g. get-size) will still come through
5892 * here and hit the 'default' below, so only disallow
5893 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5895 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5896 if (mddev
->ro
== 2) {
5898 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5899 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5900 md_wakeup_thread(mddev
->thread
);
5911 mdu_disk_info_t info
;
5912 if (copy_from_user(&info
, argp
, sizeof(info
)))
5915 err
= add_new_disk(mddev
, &info
);
5919 case HOT_REMOVE_DISK
:
5920 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5924 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5927 case SET_DISK_FAULTY
:
5928 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5932 err
= do_md_run(mddev
);
5935 case SET_BITMAP_FILE
:
5936 err
= set_bitmap_file(mddev
, (int)arg
);
5946 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5948 mddev
->hold_active
= 0;
5949 mddev_unlock(mddev
);
5958 #ifdef CONFIG_COMPAT
5959 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5960 unsigned int cmd
, unsigned long arg
)
5963 case HOT_REMOVE_DISK
:
5965 case SET_DISK_FAULTY
:
5966 case SET_BITMAP_FILE
:
5967 /* These take in integer arg, do not convert */
5970 arg
= (unsigned long)compat_ptr(arg
);
5974 return md_ioctl(bdev
, mode
, cmd
, arg
);
5976 #endif /* CONFIG_COMPAT */
5978 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5981 * Succeed if we can lock the mddev, which confirms that
5982 * it isn't being stopped right now.
5984 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5987 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5988 /* we are racing with mddev_put which is discarding this
5992 /* Wait until bdev->bd_disk is definitely gone */
5993 flush_workqueue(md_misc_wq
);
5994 /* Then retry the open from the top */
5995 return -ERESTARTSYS
;
5997 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5999 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6003 atomic_inc(&mddev
->openers
);
6004 mutex_unlock(&mddev
->open_mutex
);
6006 check_disk_size_change(mddev
->gendisk
, bdev
);
6011 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6013 mddev_t
*mddev
= disk
->private_data
;
6016 atomic_dec(&mddev
->openers
);
6021 static const struct block_device_operations md_fops
=
6023 .owner
= THIS_MODULE
,
6025 .release
= md_release
,
6027 #ifdef CONFIG_COMPAT
6028 .compat_ioctl
= md_compat_ioctl
,
6030 .getgeo
= md_getgeo
,
6033 static int md_thread(void * arg
)
6035 mdk_thread_t
*thread
= arg
;
6038 * md_thread is a 'system-thread', it's priority should be very
6039 * high. We avoid resource deadlocks individually in each
6040 * raid personality. (RAID5 does preallocation) We also use RR and
6041 * the very same RT priority as kswapd, thus we will never get
6042 * into a priority inversion deadlock.
6044 * we definitely have to have equal or higher priority than
6045 * bdflush, otherwise bdflush will deadlock if there are too
6046 * many dirty RAID5 blocks.
6049 allow_signal(SIGKILL
);
6050 while (!kthread_should_stop()) {
6052 /* We need to wait INTERRUPTIBLE so that
6053 * we don't add to the load-average.
6054 * That means we need to be sure no signals are
6057 if (signal_pending(current
))
6058 flush_signals(current
);
6060 wait_event_interruptible_timeout
6062 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6063 || kthread_should_stop(),
6066 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6067 if (!kthread_should_stop())
6068 thread
->run(thread
->mddev
);
6074 void md_wakeup_thread(mdk_thread_t
*thread
)
6077 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6078 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6079 wake_up(&thread
->wqueue
);
6083 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6086 mdk_thread_t
*thread
;
6088 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6092 init_waitqueue_head(&thread
->wqueue
);
6095 thread
->mddev
= mddev
;
6096 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6097 thread
->tsk
= kthread_run(md_thread
, thread
,
6099 mdname(thread
->mddev
),
6100 name
?: mddev
->pers
->name
);
6101 if (IS_ERR(thread
->tsk
)) {
6108 void md_unregister_thread(mdk_thread_t
*thread
)
6112 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6114 kthread_stop(thread
->tsk
);
6118 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6125 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6128 if (mddev
->external
)
6129 set_bit(Blocked
, &rdev
->flags
);
6131 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6133 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6134 __builtin_return_address(0),__builtin_return_address(1),
6135 __builtin_return_address(2),__builtin_return_address(3));
6139 if (!mddev
->pers
->error_handler
)
6141 mddev
->pers
->error_handler(mddev
,rdev
);
6142 if (mddev
->degraded
)
6143 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6144 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6145 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6146 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6147 md_wakeup_thread(mddev
->thread
);
6148 if (mddev
->event_work
.func
)
6149 queue_work(md_misc_wq
, &mddev
->event_work
);
6150 md_new_event_inintr(mddev
);
6153 /* seq_file implementation /proc/mdstat */
6155 static void status_unused(struct seq_file
*seq
)
6160 seq_printf(seq
, "unused devices: ");
6162 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6163 char b
[BDEVNAME_SIZE
];
6165 seq_printf(seq
, "%s ",
6166 bdevname(rdev
->bdev
,b
));
6169 seq_printf(seq
, "<none>");
6171 seq_printf(seq
, "\n");
6175 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6177 sector_t max_sectors
, resync
, res
;
6178 unsigned long dt
, db
;
6181 unsigned int per_milli
;
6183 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6185 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6186 max_sectors
= mddev
->resync_max_sectors
;
6188 max_sectors
= mddev
->dev_sectors
;
6191 * Should not happen.
6197 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6198 * in a sector_t, and (max_sectors>>scale) will fit in a
6199 * u32, as those are the requirements for sector_div.
6200 * Thus 'scale' must be at least 10
6203 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6204 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6207 res
= (resync
>>scale
)*1000;
6208 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6212 int i
, x
= per_milli
/50, y
= 20-x
;
6213 seq_printf(seq
, "[");
6214 for (i
= 0; i
< x
; i
++)
6215 seq_printf(seq
, "=");
6216 seq_printf(seq
, ">");
6217 for (i
= 0; i
< y
; i
++)
6218 seq_printf(seq
, ".");
6219 seq_printf(seq
, "] ");
6221 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6222 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6224 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6226 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6227 "resync" : "recovery"))),
6228 per_milli
/10, per_milli
% 10,
6229 (unsigned long long) resync
/2,
6230 (unsigned long long) max_sectors
/2);
6233 * dt: time from mark until now
6234 * db: blocks written from mark until now
6235 * rt: remaining time
6237 * rt is a sector_t, so could be 32bit or 64bit.
6238 * So we divide before multiply in case it is 32bit and close
6240 * We scale the divisor (db) by 32 to avoid loosing precision
6241 * near the end of resync when the number of remaining sectors
6243 * We then divide rt by 32 after multiplying by db to compensate.
6244 * The '+1' avoids division by zero if db is very small.
6246 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6248 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6249 - mddev
->resync_mark_cnt
;
6251 rt
= max_sectors
- resync
; /* number of remaining sectors */
6252 sector_div(rt
, db
/32+1);
6256 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6257 ((unsigned long)rt
% 60)/6);
6259 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6262 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6264 struct list_head
*tmp
;
6274 spin_lock(&all_mddevs_lock
);
6275 list_for_each(tmp
,&all_mddevs
)
6277 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6279 spin_unlock(&all_mddevs_lock
);
6282 spin_unlock(&all_mddevs_lock
);
6284 return (void*)2;/* tail */
6288 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6290 struct list_head
*tmp
;
6291 mddev_t
*next_mddev
, *mddev
= v
;
6297 spin_lock(&all_mddevs_lock
);
6299 tmp
= all_mddevs
.next
;
6301 tmp
= mddev
->all_mddevs
.next
;
6302 if (tmp
!= &all_mddevs
)
6303 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6305 next_mddev
= (void*)2;
6308 spin_unlock(&all_mddevs_lock
);
6316 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6320 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6324 struct mdstat_info
{
6328 static int md_seq_show(struct seq_file
*seq
, void *v
)
6333 struct mdstat_info
*mi
= seq
->private;
6334 struct bitmap
*bitmap
;
6336 if (v
== (void*)1) {
6337 struct mdk_personality
*pers
;
6338 seq_printf(seq
, "Personalities : ");
6339 spin_lock(&pers_lock
);
6340 list_for_each_entry(pers
, &pers_list
, list
)
6341 seq_printf(seq
, "[%s] ", pers
->name
);
6343 spin_unlock(&pers_lock
);
6344 seq_printf(seq
, "\n");
6345 mi
->event
= atomic_read(&md_event_count
);
6348 if (v
== (void*)2) {
6353 if (mddev_lock(mddev
) < 0)
6356 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6357 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6358 mddev
->pers
? "" : "in");
6361 seq_printf(seq
, " (read-only)");
6363 seq_printf(seq
, " (auto-read-only)");
6364 seq_printf(seq
, " %s", mddev
->pers
->name
);
6368 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6369 char b
[BDEVNAME_SIZE
];
6370 seq_printf(seq
, " %s[%d]",
6371 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6372 if (test_bit(WriteMostly
, &rdev
->flags
))
6373 seq_printf(seq
, "(W)");
6374 if (test_bit(Faulty
, &rdev
->flags
)) {
6375 seq_printf(seq
, "(F)");
6377 } else if (rdev
->raid_disk
< 0)
6378 seq_printf(seq
, "(S)"); /* spare */
6379 sectors
+= rdev
->sectors
;
6382 if (!list_empty(&mddev
->disks
)) {
6384 seq_printf(seq
, "\n %llu blocks",
6385 (unsigned long long)
6386 mddev
->array_sectors
/ 2);
6388 seq_printf(seq
, "\n %llu blocks",
6389 (unsigned long long)sectors
/ 2);
6391 if (mddev
->persistent
) {
6392 if (mddev
->major_version
!= 0 ||
6393 mddev
->minor_version
!= 90) {
6394 seq_printf(seq
," super %d.%d",
6395 mddev
->major_version
,
6396 mddev
->minor_version
);
6398 } else if (mddev
->external
)
6399 seq_printf(seq
, " super external:%s",
6400 mddev
->metadata_type
);
6402 seq_printf(seq
, " super non-persistent");
6405 mddev
->pers
->status(seq
, mddev
);
6406 seq_printf(seq
, "\n ");
6407 if (mddev
->pers
->sync_request
) {
6408 if (mddev
->curr_resync
> 2) {
6409 status_resync(seq
, mddev
);
6410 seq_printf(seq
, "\n ");
6411 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6412 seq_printf(seq
, "\tresync=DELAYED\n ");
6413 else if (mddev
->recovery_cp
< MaxSector
)
6414 seq_printf(seq
, "\tresync=PENDING\n ");
6417 seq_printf(seq
, "\n ");
6419 if ((bitmap
= mddev
->bitmap
)) {
6420 unsigned long chunk_kb
;
6421 unsigned long flags
;
6422 spin_lock_irqsave(&bitmap
->lock
, flags
);
6423 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6424 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6426 bitmap
->pages
- bitmap
->missing_pages
,
6428 (bitmap
->pages
- bitmap
->missing_pages
)
6429 << (PAGE_SHIFT
- 10),
6430 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6431 chunk_kb
? "KB" : "B");
6433 seq_printf(seq
, ", file: ");
6434 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6437 seq_printf(seq
, "\n");
6438 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6441 seq_printf(seq
, "\n");
6443 mddev_unlock(mddev
);
6448 static const struct seq_operations md_seq_ops
= {
6449 .start
= md_seq_start
,
6450 .next
= md_seq_next
,
6451 .stop
= md_seq_stop
,
6452 .show
= md_seq_show
,
6455 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6458 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6462 error
= seq_open(file
, &md_seq_ops
);
6466 struct seq_file
*p
= file
->private_data
;
6468 mi
->event
= atomic_read(&md_event_count
);
6473 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6475 struct seq_file
*m
= filp
->private_data
;
6476 struct mdstat_info
*mi
= m
->private;
6479 poll_wait(filp
, &md_event_waiters
, wait
);
6481 /* always allow read */
6482 mask
= POLLIN
| POLLRDNORM
;
6484 if (mi
->event
!= atomic_read(&md_event_count
))
6485 mask
|= POLLERR
| POLLPRI
;
6489 static const struct file_operations md_seq_fops
= {
6490 .owner
= THIS_MODULE
,
6491 .open
= md_seq_open
,
6493 .llseek
= seq_lseek
,
6494 .release
= seq_release_private
,
6495 .poll
= mdstat_poll
,
6498 int register_md_personality(struct mdk_personality
*p
)
6500 spin_lock(&pers_lock
);
6501 list_add_tail(&p
->list
, &pers_list
);
6502 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6503 spin_unlock(&pers_lock
);
6507 int unregister_md_personality(struct mdk_personality
*p
)
6509 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6510 spin_lock(&pers_lock
);
6511 list_del_init(&p
->list
);
6512 spin_unlock(&pers_lock
);
6516 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6524 rdev_for_each_rcu(rdev
, mddev
) {
6525 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6526 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6527 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6528 atomic_read(&disk
->sync_io
);
6529 /* sync IO will cause sync_io to increase before the disk_stats
6530 * as sync_io is counted when a request starts, and
6531 * disk_stats is counted when it completes.
6532 * So resync activity will cause curr_events to be smaller than
6533 * when there was no such activity.
6534 * non-sync IO will cause disk_stat to increase without
6535 * increasing sync_io so curr_events will (eventually)
6536 * be larger than it was before. Once it becomes
6537 * substantially larger, the test below will cause
6538 * the array to appear non-idle, and resync will slow
6540 * If there is a lot of outstanding resync activity when
6541 * we set last_event to curr_events, then all that activity
6542 * completing might cause the array to appear non-idle
6543 * and resync will be slowed down even though there might
6544 * not have been non-resync activity. This will only
6545 * happen once though. 'last_events' will soon reflect
6546 * the state where there is little or no outstanding
6547 * resync requests, and further resync activity will
6548 * always make curr_events less than last_events.
6551 if (init
|| curr_events
- rdev
->last_events
> 64) {
6552 rdev
->last_events
= curr_events
;
6560 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6562 /* another "blocks" (512byte) blocks have been synced */
6563 atomic_sub(blocks
, &mddev
->recovery_active
);
6564 wake_up(&mddev
->recovery_wait
);
6566 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6567 md_wakeup_thread(mddev
->thread
);
6568 // stop recovery, signal do_sync ....
6573 /* md_write_start(mddev, bi)
6574 * If we need to update some array metadata (e.g. 'active' flag
6575 * in superblock) before writing, schedule a superblock update
6576 * and wait for it to complete.
6578 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6581 if (bio_data_dir(bi
) != WRITE
)
6584 BUG_ON(mddev
->ro
== 1);
6585 if (mddev
->ro
== 2) {
6586 /* need to switch to read/write */
6588 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6589 md_wakeup_thread(mddev
->thread
);
6590 md_wakeup_thread(mddev
->sync_thread
);
6593 atomic_inc(&mddev
->writes_pending
);
6594 if (mddev
->safemode
== 1)
6595 mddev
->safemode
= 0;
6596 if (mddev
->in_sync
) {
6597 spin_lock_irq(&mddev
->write_lock
);
6598 if (mddev
->in_sync
) {
6600 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6601 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6602 md_wakeup_thread(mddev
->thread
);
6605 spin_unlock_irq(&mddev
->write_lock
);
6608 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6609 wait_event(mddev
->sb_wait
,
6610 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6613 void md_write_end(mddev_t
*mddev
)
6615 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6616 if (mddev
->safemode
== 2)
6617 md_wakeup_thread(mddev
->thread
);
6618 else if (mddev
->safemode_delay
)
6619 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6623 /* md_allow_write(mddev)
6624 * Calling this ensures that the array is marked 'active' so that writes
6625 * may proceed without blocking. It is important to call this before
6626 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6627 * Must be called with mddev_lock held.
6629 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6630 * is dropped, so return -EAGAIN after notifying userspace.
6632 int md_allow_write(mddev_t
*mddev
)
6638 if (!mddev
->pers
->sync_request
)
6641 spin_lock_irq(&mddev
->write_lock
);
6642 if (mddev
->in_sync
) {
6644 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6645 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6646 if (mddev
->safemode_delay
&&
6647 mddev
->safemode
== 0)
6648 mddev
->safemode
= 1;
6649 spin_unlock_irq(&mddev
->write_lock
);
6650 md_update_sb(mddev
, 0);
6651 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6653 spin_unlock_irq(&mddev
->write_lock
);
6655 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6660 EXPORT_SYMBOL_GPL(md_allow_write
);
6662 void md_unplug(mddev_t
*mddev
)
6665 blk_unplug(mddev
->queue
);
6667 mddev
->plug
->unplug_fn(mddev
->plug
);
6670 #define SYNC_MARKS 10
6671 #define SYNC_MARK_STEP (3*HZ)
6672 void md_do_sync(mddev_t
*mddev
)
6675 unsigned int currspeed
= 0,
6677 sector_t max_sectors
,j
, io_sectors
;
6678 unsigned long mark
[SYNC_MARKS
];
6679 sector_t mark_cnt
[SYNC_MARKS
];
6681 struct list_head
*tmp
;
6682 sector_t last_check
;
6687 /* just incase thread restarts... */
6688 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6690 if (mddev
->ro
) /* never try to sync a read-only array */
6693 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6694 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6695 desc
= "data-check";
6696 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6697 desc
= "requested-resync";
6700 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6705 /* we overload curr_resync somewhat here.
6706 * 0 == not engaged in resync at all
6707 * 2 == checking that there is no conflict with another sync
6708 * 1 == like 2, but have yielded to allow conflicting resync to
6710 * other == active in resync - this many blocks
6712 * Before starting a resync we must have set curr_resync to
6713 * 2, and then checked that every "conflicting" array has curr_resync
6714 * less than ours. When we find one that is the same or higher
6715 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6716 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6717 * This will mean we have to start checking from the beginning again.
6722 mddev
->curr_resync
= 2;
6725 if (kthread_should_stop())
6726 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6728 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6730 for_each_mddev(mddev2
, tmp
) {
6731 if (mddev2
== mddev
)
6733 if (!mddev
->parallel_resync
6734 && mddev2
->curr_resync
6735 && match_mddev_units(mddev
, mddev2
)) {
6737 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6738 /* arbitrarily yield */
6739 mddev
->curr_resync
= 1;
6740 wake_up(&resync_wait
);
6742 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6743 /* no need to wait here, we can wait the next
6744 * time 'round when curr_resync == 2
6747 /* We need to wait 'interruptible' so as not to
6748 * contribute to the load average, and not to
6749 * be caught by 'softlockup'
6751 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6752 if (!kthread_should_stop() &&
6753 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6754 printk(KERN_INFO
"md: delaying %s of %s"
6755 " until %s has finished (they"
6756 " share one or more physical units)\n",
6757 desc
, mdname(mddev
), mdname(mddev2
));
6759 if (signal_pending(current
))
6760 flush_signals(current
);
6762 finish_wait(&resync_wait
, &wq
);
6765 finish_wait(&resync_wait
, &wq
);
6768 } while (mddev
->curr_resync
< 2);
6771 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6772 /* resync follows the size requested by the personality,
6773 * which defaults to physical size, but can be virtual size
6775 max_sectors
= mddev
->resync_max_sectors
;
6776 mddev
->resync_mismatches
= 0;
6777 /* we don't use the checkpoint if there's a bitmap */
6778 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6779 j
= mddev
->resync_min
;
6780 else if (!mddev
->bitmap
)
6781 j
= mddev
->recovery_cp
;
6783 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6784 max_sectors
= mddev
->dev_sectors
;
6786 /* recovery follows the physical size of devices */
6787 max_sectors
= mddev
->dev_sectors
;
6790 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6791 if (rdev
->raid_disk
>= 0 &&
6792 !test_bit(Faulty
, &rdev
->flags
) &&
6793 !test_bit(In_sync
, &rdev
->flags
) &&
6794 rdev
->recovery_offset
< j
)
6795 j
= rdev
->recovery_offset
;
6799 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6800 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6801 " %d KB/sec/disk.\n", speed_min(mddev
));
6802 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6803 "(but not more than %d KB/sec) for %s.\n",
6804 speed_max(mddev
), desc
);
6806 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6809 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6811 mark_cnt
[m
] = io_sectors
;
6814 mddev
->resync_mark
= mark
[last_mark
];
6815 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6818 * Tune reconstruction:
6820 window
= 32*(PAGE_SIZE
/512);
6821 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6822 window
/2,(unsigned long long) max_sectors
/2);
6824 atomic_set(&mddev
->recovery_active
, 0);
6829 "md: resuming %s of %s from checkpoint.\n",
6830 desc
, mdname(mddev
));
6831 mddev
->curr_resync
= j
;
6833 mddev
->curr_resync_completed
= j
;
6835 while (j
< max_sectors
) {
6840 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6841 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6842 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6843 > (max_sectors
>> 4)) ||
6844 (j
- mddev
->curr_resync_completed
)*2
6845 >= mddev
->resync_max
- mddev
->curr_resync_completed
6847 /* time to update curr_resync_completed */
6849 wait_event(mddev
->recovery_wait
,
6850 atomic_read(&mddev
->recovery_active
) == 0);
6851 mddev
->curr_resync_completed
= j
;
6852 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6853 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6856 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6857 /* As this condition is controlled by user-space,
6858 * we can block indefinitely, so use '_interruptible'
6859 * to avoid triggering warnings.
6861 flush_signals(current
); /* just in case */
6862 wait_event_interruptible(mddev
->recovery_wait
,
6863 mddev
->resync_max
> j
6864 || kthread_should_stop());
6867 if (kthread_should_stop())
6870 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6871 currspeed
< speed_min(mddev
));
6873 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6877 if (!skipped
) { /* actual IO requested */
6878 io_sectors
+= sectors
;
6879 atomic_add(sectors
, &mddev
->recovery_active
);
6883 if (j
>1) mddev
->curr_resync
= j
;
6884 mddev
->curr_mark_cnt
= io_sectors
;
6885 if (last_check
== 0)
6886 /* this is the earliers that rebuilt will be
6887 * visible in /proc/mdstat
6889 md_new_event(mddev
);
6891 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6894 last_check
= io_sectors
;
6896 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6900 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6902 int next
= (last_mark
+1) % SYNC_MARKS
;
6904 mddev
->resync_mark
= mark
[next
];
6905 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6906 mark
[next
] = jiffies
;
6907 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6912 if (kthread_should_stop())
6917 * this loop exits only if either when we are slower than
6918 * the 'hard' speed limit, or the system was IO-idle for
6920 * the system might be non-idle CPU-wise, but we only care
6921 * about not overloading the IO subsystem. (things like an
6922 * e2fsck being done on the RAID array should execute fast)
6927 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6928 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6930 if (currspeed
> speed_min(mddev
)) {
6931 if ((currspeed
> speed_max(mddev
)) ||
6932 !is_mddev_idle(mddev
, 0)) {
6938 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6940 * this also signals 'finished resyncing' to md_stop
6945 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6947 /* tell personality that we are finished */
6948 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6950 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6951 mddev
->curr_resync
> 2) {
6952 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6953 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6954 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6956 "md: checkpointing %s of %s.\n",
6957 desc
, mdname(mddev
));
6958 mddev
->recovery_cp
= mddev
->curr_resync
;
6961 mddev
->recovery_cp
= MaxSector
;
6963 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6964 mddev
->curr_resync
= MaxSector
;
6966 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6967 if (rdev
->raid_disk
>= 0 &&
6968 mddev
->delta_disks
>= 0 &&
6969 !test_bit(Faulty
, &rdev
->flags
) &&
6970 !test_bit(In_sync
, &rdev
->flags
) &&
6971 rdev
->recovery_offset
< mddev
->curr_resync
)
6972 rdev
->recovery_offset
= mddev
->curr_resync
;
6976 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6979 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6980 /* We completed so min/max setting can be forgotten if used. */
6981 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6982 mddev
->resync_min
= 0;
6983 mddev
->resync_max
= MaxSector
;
6984 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6985 mddev
->resync_min
= mddev
->curr_resync_completed
;
6986 mddev
->curr_resync
= 0;
6987 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6988 mddev
->curr_resync_completed
= 0;
6989 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6990 wake_up(&resync_wait
);
6991 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6992 md_wakeup_thread(mddev
->thread
);
6997 * got a signal, exit.
7000 "md: md_do_sync() got signal ... exiting\n");
7001 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7005 EXPORT_SYMBOL_GPL(md_do_sync
);
7008 static int remove_and_add_spares(mddev_t
*mddev
)
7013 mddev
->curr_resync_completed
= 0;
7015 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7016 if (rdev
->raid_disk
>= 0 &&
7017 !test_bit(Blocked
, &rdev
->flags
) &&
7018 (test_bit(Faulty
, &rdev
->flags
) ||
7019 ! test_bit(In_sync
, &rdev
->flags
)) &&
7020 atomic_read(&rdev
->nr_pending
)==0) {
7021 if (mddev
->pers
->hot_remove_disk(
7022 mddev
, rdev
->raid_disk
)==0) {
7024 sprintf(nm
,"rd%d", rdev
->raid_disk
);
7025 sysfs_remove_link(&mddev
->kobj
, nm
);
7026 rdev
->raid_disk
= -1;
7030 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
7031 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7032 if (rdev
->raid_disk
>= 0 &&
7033 !test_bit(In_sync
, &rdev
->flags
) &&
7034 !test_bit(Blocked
, &rdev
->flags
))
7036 if (rdev
->raid_disk
< 0
7037 && !test_bit(Faulty
, &rdev
->flags
)) {
7038 rdev
->recovery_offset
= 0;
7040 hot_add_disk(mddev
, rdev
) == 0) {
7042 sprintf(nm
, "rd%d", rdev
->raid_disk
);
7043 if (sysfs_create_link(&mddev
->kobj
,
7045 /* failure here is OK */;
7047 md_new_event(mddev
);
7048 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7057 static void reap_sync_thread(mddev_t
*mddev
)
7061 /* resync has finished, collect result */
7062 md_unregister_thread(mddev
->sync_thread
);
7063 mddev
->sync_thread
= NULL
;
7064 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7065 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7067 /* activate any spares */
7068 if (mddev
->pers
->spare_active(mddev
))
7069 sysfs_notify(&mddev
->kobj
, NULL
,
7072 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7073 mddev
->pers
->finish_reshape
)
7074 mddev
->pers
->finish_reshape(mddev
);
7075 md_update_sb(mddev
, 1);
7077 /* if array is no-longer degraded, then any saved_raid_disk
7078 * information must be scrapped
7080 if (!mddev
->degraded
)
7081 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7082 rdev
->saved_raid_disk
= -1;
7084 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7085 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7086 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7087 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7088 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7089 /* flag recovery needed just to double check */
7090 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7091 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7092 md_new_event(mddev
);
7096 * This routine is regularly called by all per-raid-array threads to
7097 * deal with generic issues like resync and super-block update.
7098 * Raid personalities that don't have a thread (linear/raid0) do not
7099 * need this as they never do any recovery or update the superblock.
7101 * It does not do any resync itself, but rather "forks" off other threads
7102 * to do that as needed.
7103 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7104 * "->recovery" and create a thread at ->sync_thread.
7105 * When the thread finishes it sets MD_RECOVERY_DONE
7106 * and wakeups up this thread which will reap the thread and finish up.
7107 * This thread also removes any faulty devices (with nr_pending == 0).
7109 * The overall approach is:
7110 * 1/ if the superblock needs updating, update it.
7111 * 2/ If a recovery thread is running, don't do anything else.
7112 * 3/ If recovery has finished, clean up, possibly marking spares active.
7113 * 4/ If there are any faulty devices, remove them.
7114 * 5/ If array is degraded, try to add spares devices
7115 * 6/ If array has spares or is not in-sync, start a resync thread.
7117 void md_check_recovery(mddev_t
*mddev
)
7120 bitmap_daemon_work(mddev
);
7125 if (signal_pending(current
)) {
7126 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7127 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7129 mddev
->safemode
= 2;
7131 flush_signals(current
);
7134 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7137 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7138 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7139 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7140 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7141 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7142 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7146 if (mddev_trylock(mddev
)) {
7150 /* Only thing we do on a ro array is remove
7153 remove_and_add_spares(mddev
);
7154 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7158 if (!mddev
->external
) {
7160 spin_lock_irq(&mddev
->write_lock
);
7161 if (mddev
->safemode
&&
7162 !atomic_read(&mddev
->writes_pending
) &&
7164 mddev
->recovery_cp
== MaxSector
) {
7167 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7169 if (mddev
->safemode
== 1)
7170 mddev
->safemode
= 0;
7171 spin_unlock_irq(&mddev
->write_lock
);
7173 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7177 md_update_sb(mddev
, 0);
7179 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7180 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7181 /* resync/recovery still happening */
7182 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7185 if (mddev
->sync_thread
) {
7186 reap_sync_thread(mddev
);
7189 /* Set RUNNING before clearing NEEDED to avoid
7190 * any transients in the value of "sync_action".
7192 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7193 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7194 /* Clear some bits that don't mean anything, but
7197 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7198 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7200 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7202 /* no recovery is running.
7203 * remove any failed drives, then
7204 * add spares if possible.
7205 * Spare are also removed and re-added, to allow
7206 * the personality to fail the re-add.
7209 if (mddev
->reshape_position
!= MaxSector
) {
7210 if (mddev
->pers
->check_reshape
== NULL
||
7211 mddev
->pers
->check_reshape(mddev
) != 0)
7212 /* Cannot proceed */
7214 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7215 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7216 } else if ((spares
= remove_and_add_spares(mddev
))) {
7217 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7218 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7219 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7220 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7221 } else if (mddev
->recovery_cp
< MaxSector
) {
7222 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7223 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7224 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7225 /* nothing to be done ... */
7228 if (mddev
->pers
->sync_request
) {
7229 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7230 /* We are adding a device or devices to an array
7231 * which has the bitmap stored on all devices.
7232 * So make sure all bitmap pages get written
7234 bitmap_write_all(mddev
->bitmap
);
7236 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7239 if (!mddev
->sync_thread
) {
7240 printk(KERN_ERR
"%s: could not start resync"
7243 /* leave the spares where they are, it shouldn't hurt */
7244 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7245 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7246 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7247 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7248 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7250 md_wakeup_thread(mddev
->sync_thread
);
7251 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7252 md_new_event(mddev
);
7255 if (!mddev
->sync_thread
) {
7256 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7257 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7259 if (mddev
->sysfs_action
)
7260 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7262 mddev_unlock(mddev
);
7266 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7268 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7269 wait_event_timeout(rdev
->blocked_wait
,
7270 !test_bit(Blocked
, &rdev
->flags
),
7271 msecs_to_jiffies(5000));
7272 rdev_dec_pending(rdev
, mddev
);
7274 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7276 static int md_notify_reboot(struct notifier_block
*this,
7277 unsigned long code
, void *x
)
7279 struct list_head
*tmp
;
7282 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7284 printk(KERN_INFO
"md: stopping all md devices.\n");
7286 for_each_mddev(mddev
, tmp
)
7287 if (mddev_trylock(mddev
)) {
7288 /* Force a switch to readonly even array
7289 * appears to still be in use. Hence
7292 md_set_readonly(mddev
, 100);
7293 mddev_unlock(mddev
);
7296 * certain more exotic SCSI devices are known to be
7297 * volatile wrt too early system reboots. While the
7298 * right place to handle this issue is the given
7299 * driver, we do want to have a safe RAID driver ...
7306 static struct notifier_block md_notifier
= {
7307 .notifier_call
= md_notify_reboot
,
7309 .priority
= INT_MAX
, /* before any real devices */
7312 static void md_geninit(void)
7314 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7316 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7319 static int __init
md_init(void)
7323 md_wq
= alloc_workqueue("md", WQ_RESCUER
, 0);
7327 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
7331 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
7334 if ((ret
= register_blkdev(0, "mdp")) < 0)
7338 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7339 md_probe
, NULL
, NULL
);
7340 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7341 md_probe
, NULL
, NULL
);
7343 register_reboot_notifier(&md_notifier
);
7344 raid_table_header
= register_sysctl_table(raid_root_table
);
7350 unregister_blkdev(MD_MAJOR
, "md");
7352 destroy_workqueue(md_misc_wq
);
7354 destroy_workqueue(md_wq
);
7362 * Searches all registered partitions for autorun RAID arrays
7366 static LIST_HEAD(all_detected_devices
);
7367 struct detected_devices_node
{
7368 struct list_head list
;
7372 void md_autodetect_dev(dev_t dev
)
7374 struct detected_devices_node
*node_detected_dev
;
7376 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7377 if (node_detected_dev
) {
7378 node_detected_dev
->dev
= dev
;
7379 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7381 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7382 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7387 static void autostart_arrays(int part
)
7390 struct detected_devices_node
*node_detected_dev
;
7392 int i_scanned
, i_passed
;
7397 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7399 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7401 node_detected_dev
= list_entry(all_detected_devices
.next
,
7402 struct detected_devices_node
, list
);
7403 list_del(&node_detected_dev
->list
);
7404 dev
= node_detected_dev
->dev
;
7405 kfree(node_detected_dev
);
7406 rdev
= md_import_device(dev
,0, 90);
7410 if (test_bit(Faulty
, &rdev
->flags
)) {
7414 set_bit(AutoDetected
, &rdev
->flags
);
7415 list_add(&rdev
->same_set
, &pending_raid_disks
);
7419 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7420 i_scanned
, i_passed
);
7422 autorun_devices(part
);
7425 #endif /* !MODULE */
7427 static __exit
void md_exit(void)
7430 struct list_head
*tmp
;
7432 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7433 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7435 unregister_blkdev(MD_MAJOR
,"md");
7436 unregister_blkdev(mdp_major
, "mdp");
7437 unregister_reboot_notifier(&md_notifier
);
7438 unregister_sysctl_table(raid_table_header
);
7439 remove_proc_entry("mdstat", NULL
);
7440 for_each_mddev(mddev
, tmp
) {
7441 export_array(mddev
);
7442 mddev
->hold_active
= 0;
7444 destroy_workqueue(md_misc_wq
);
7445 destroy_workqueue(md_wq
);
7448 subsys_initcall(md_init
);
7449 module_exit(md_exit
)
7451 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7453 return sprintf(buffer
, "%d", start_readonly
);
7455 static int set_ro(const char *val
, struct kernel_param
*kp
)
7458 int num
= simple_strtoul(val
, &e
, 10);
7459 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7460 start_readonly
= num
;
7466 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7467 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7469 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7471 EXPORT_SYMBOL(register_md_personality
);
7472 EXPORT_SYMBOL(unregister_md_personality
);
7473 EXPORT_SYMBOL(md_error
);
7474 EXPORT_SYMBOL(md_done_sync
);
7475 EXPORT_SYMBOL(md_write_start
);
7476 EXPORT_SYMBOL(md_write_end
);
7477 EXPORT_SYMBOL(md_register_thread
);
7478 EXPORT_SYMBOL(md_unregister_thread
);
7479 EXPORT_SYMBOL(md_wakeup_thread
);
7480 EXPORT_SYMBOL(md_check_recovery
);
7481 MODULE_LICENSE("GPL");
7482 MODULE_DESCRIPTION("MD RAID framework");
7484 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);