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
->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
= rdev
->bdev
;
808 bio
->bi_sector
= sector
+ rdev
->sb_start
;
810 bio
->bi_sector
= sector
+ rdev
->data_offset
;
811 bio_add_page(bio
, page
, size
, 0);
812 init_completion(&event
);
813 bio
->bi_private
= &event
;
814 bio
->bi_end_io
= bi_complete
;
816 wait_for_completion(&event
);
818 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
822 EXPORT_SYMBOL_GPL(sync_page_io
);
824 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
826 char b
[BDEVNAME_SIZE
];
827 if (!rdev
->sb_page
) {
835 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
841 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
842 bdevname(rdev
->bdev
,b
));
846 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
848 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
849 sb1
->set_uuid1
== sb2
->set_uuid1
&&
850 sb1
->set_uuid2
== sb2
->set_uuid2
&&
851 sb1
->set_uuid3
== sb2
->set_uuid3
;
854 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
857 mdp_super_t
*tmp1
, *tmp2
;
859 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
860 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
862 if (!tmp1
|| !tmp2
) {
864 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
872 * nr_disks is not constant
877 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
885 static u32
md_csum_fold(u32 csum
)
887 csum
= (csum
& 0xffff) + (csum
>> 16);
888 return (csum
& 0xffff) + (csum
>> 16);
891 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
894 u32
*sb32
= (u32
*)sb
;
896 unsigned int disk_csum
, csum
;
898 disk_csum
= sb
->sb_csum
;
901 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
903 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
907 /* This used to use csum_partial, which was wrong for several
908 * reasons including that different results are returned on
909 * different architectures. It isn't critical that we get exactly
910 * the same return value as before (we always csum_fold before
911 * testing, and that removes any differences). However as we
912 * know that csum_partial always returned a 16bit value on
913 * alphas, do a fold to maximise conformity to previous behaviour.
915 sb
->sb_csum
= md_csum_fold(disk_csum
);
917 sb
->sb_csum
= disk_csum
;
924 * Handle superblock details.
925 * We want to be able to handle multiple superblock formats
926 * so we have a common interface to them all, and an array of
927 * different handlers.
928 * We rely on user-space to write the initial superblock, and support
929 * reading and updating of superblocks.
930 * Interface methods are:
931 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
932 * loads and validates a superblock on dev.
933 * if refdev != NULL, compare superblocks on both devices
935 * 0 - dev has a superblock that is compatible with refdev
936 * 1 - dev has a superblock that is compatible and newer than refdev
937 * so dev should be used as the refdev in future
938 * -EINVAL superblock incompatible or invalid
939 * -othererror e.g. -EIO
941 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
942 * Verify that dev is acceptable into mddev.
943 * The first time, mddev->raid_disks will be 0, and data from
944 * dev should be merged in. Subsequent calls check that dev
945 * is new enough. Return 0 or -EINVAL
947 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
948 * Update the superblock for rdev with data in mddev
949 * This does not write to disc.
955 struct module
*owner
;
956 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
958 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
959 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
960 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
961 sector_t num_sectors
);
965 * Check that the given mddev has no bitmap.
967 * This function is called from the run method of all personalities that do not
968 * support bitmaps. It prints an error message and returns non-zero if mddev
969 * has a bitmap. Otherwise, it returns 0.
972 int md_check_no_bitmap(mddev_t
*mddev
)
974 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
976 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
977 mdname(mddev
), mddev
->pers
->name
);
980 EXPORT_SYMBOL(md_check_no_bitmap
);
983 * load_super for 0.90.0
985 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
987 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
992 * Calculate the position of the superblock (512byte sectors),
993 * it's at the end of the disk.
995 * It also happens to be a multiple of 4Kb.
997 rdev
->sb_start
= calc_dev_sboffset(rdev
);
999 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1000 if (ret
) return ret
;
1004 bdevname(rdev
->bdev
, b
);
1005 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1007 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1008 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1013 if (sb
->major_version
!= 0 ||
1014 sb
->minor_version
< 90 ||
1015 sb
->minor_version
> 91) {
1016 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1017 sb
->major_version
, sb
->minor_version
,
1022 if (sb
->raid_disks
<= 0)
1025 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1026 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1031 rdev
->preferred_minor
= sb
->md_minor
;
1032 rdev
->data_offset
= 0;
1033 rdev
->sb_size
= MD_SB_BYTES
;
1035 if (sb
->level
== LEVEL_MULTIPATH
)
1038 rdev
->desc_nr
= sb
->this_disk
.number
;
1044 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
1045 if (!uuid_equal(refsb
, sb
)) {
1046 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1047 b
, bdevname(refdev
->bdev
,b2
));
1050 if (!sb_equal(refsb
, sb
)) {
1051 printk(KERN_WARNING
"md: %s has same UUID"
1052 " but different superblock to %s\n",
1053 b
, bdevname(refdev
->bdev
, b2
));
1057 ev2
= md_event(refsb
);
1063 rdev
->sectors
= rdev
->sb_start
;
1065 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
1066 /* "this cannot possibly happen" ... */
1074 * validate_super for 0.90.0
1076 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1079 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1080 __u64 ev1
= md_event(sb
);
1082 rdev
->raid_disk
= -1;
1083 clear_bit(Faulty
, &rdev
->flags
);
1084 clear_bit(In_sync
, &rdev
->flags
);
1085 clear_bit(WriteMostly
, &rdev
->flags
);
1087 if (mddev
->raid_disks
== 0) {
1088 mddev
->major_version
= 0;
1089 mddev
->minor_version
= sb
->minor_version
;
1090 mddev
->patch_version
= sb
->patch_version
;
1091 mddev
->external
= 0;
1092 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1093 mddev
->ctime
= sb
->ctime
;
1094 mddev
->utime
= sb
->utime
;
1095 mddev
->level
= sb
->level
;
1096 mddev
->clevel
[0] = 0;
1097 mddev
->layout
= sb
->layout
;
1098 mddev
->raid_disks
= sb
->raid_disks
;
1099 mddev
->dev_sectors
= sb
->size
* 2;
1100 mddev
->events
= ev1
;
1101 mddev
->bitmap_info
.offset
= 0;
1102 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1104 if (mddev
->minor_version
>= 91) {
1105 mddev
->reshape_position
= sb
->reshape_position
;
1106 mddev
->delta_disks
= sb
->delta_disks
;
1107 mddev
->new_level
= sb
->new_level
;
1108 mddev
->new_layout
= sb
->new_layout
;
1109 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1111 mddev
->reshape_position
= MaxSector
;
1112 mddev
->delta_disks
= 0;
1113 mddev
->new_level
= mddev
->level
;
1114 mddev
->new_layout
= mddev
->layout
;
1115 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1118 if (sb
->state
& (1<<MD_SB_CLEAN
))
1119 mddev
->recovery_cp
= MaxSector
;
1121 if (sb
->events_hi
== sb
->cp_events_hi
&&
1122 sb
->events_lo
== sb
->cp_events_lo
) {
1123 mddev
->recovery_cp
= sb
->recovery_cp
;
1125 mddev
->recovery_cp
= 0;
1128 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1129 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1130 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1131 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1133 mddev
->max_disks
= MD_SB_DISKS
;
1135 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1136 mddev
->bitmap_info
.file
== NULL
)
1137 mddev
->bitmap_info
.offset
=
1138 mddev
->bitmap_info
.default_offset
;
1140 } else if (mddev
->pers
== NULL
) {
1141 /* Insist on good event counter while assembling, except
1142 * for spares (which don't need an event count) */
1144 if (sb
->disks
[rdev
->desc_nr
].state
& (
1145 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1146 if (ev1
< mddev
->events
)
1148 } else if (mddev
->bitmap
) {
1149 /* if adding to array with a bitmap, then we can accept an
1150 * older device ... but not too old.
1152 if (ev1
< mddev
->bitmap
->events_cleared
)
1155 if (ev1
< mddev
->events
)
1156 /* just a hot-add of a new device, leave raid_disk at -1 */
1160 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1161 desc
= sb
->disks
+ rdev
->desc_nr
;
1163 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1164 set_bit(Faulty
, &rdev
->flags
);
1165 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1166 desc->raid_disk < mddev->raid_disks */) {
1167 set_bit(In_sync
, &rdev
->flags
);
1168 rdev
->raid_disk
= desc
->raid_disk
;
1169 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1170 /* active but not in sync implies recovery up to
1171 * reshape position. We don't know exactly where
1172 * that is, so set to zero for now */
1173 if (mddev
->minor_version
>= 91) {
1174 rdev
->recovery_offset
= 0;
1175 rdev
->raid_disk
= desc
->raid_disk
;
1178 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1179 set_bit(WriteMostly
, &rdev
->flags
);
1180 } else /* MULTIPATH are always insync */
1181 set_bit(In_sync
, &rdev
->flags
);
1186 * sync_super for 0.90.0
1188 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1192 int next_spare
= mddev
->raid_disks
;
1195 /* make rdev->sb match mddev data..
1198 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1199 * 3/ any empty disks < next_spare become removed
1201 * disks[0] gets initialised to REMOVED because
1202 * we cannot be sure from other fields if it has
1203 * been initialised or not.
1206 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1208 rdev
->sb_size
= MD_SB_BYTES
;
1210 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1212 memset(sb
, 0, sizeof(*sb
));
1214 sb
->md_magic
= MD_SB_MAGIC
;
1215 sb
->major_version
= mddev
->major_version
;
1216 sb
->patch_version
= mddev
->patch_version
;
1217 sb
->gvalid_words
= 0; /* ignored */
1218 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1219 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1220 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1221 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1223 sb
->ctime
= mddev
->ctime
;
1224 sb
->level
= mddev
->level
;
1225 sb
->size
= mddev
->dev_sectors
/ 2;
1226 sb
->raid_disks
= mddev
->raid_disks
;
1227 sb
->md_minor
= mddev
->md_minor
;
1228 sb
->not_persistent
= 0;
1229 sb
->utime
= mddev
->utime
;
1231 sb
->events_hi
= (mddev
->events
>>32);
1232 sb
->events_lo
= (u32
)mddev
->events
;
1234 if (mddev
->reshape_position
== MaxSector
)
1235 sb
->minor_version
= 90;
1237 sb
->minor_version
= 91;
1238 sb
->reshape_position
= mddev
->reshape_position
;
1239 sb
->new_level
= mddev
->new_level
;
1240 sb
->delta_disks
= mddev
->delta_disks
;
1241 sb
->new_layout
= mddev
->new_layout
;
1242 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1244 mddev
->minor_version
= sb
->minor_version
;
1247 sb
->recovery_cp
= mddev
->recovery_cp
;
1248 sb
->cp_events_hi
= (mddev
->events
>>32);
1249 sb
->cp_events_lo
= (u32
)mddev
->events
;
1250 if (mddev
->recovery_cp
== MaxSector
)
1251 sb
->state
= (1<< MD_SB_CLEAN
);
1253 sb
->recovery_cp
= 0;
1255 sb
->layout
= mddev
->layout
;
1256 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1258 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1259 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1261 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1262 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1265 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1267 if (rdev2
->raid_disk
>= 0 &&
1268 sb
->minor_version
>= 91)
1269 /* we have nowhere to store the recovery_offset,
1270 * but if it is not below the reshape_position,
1271 * we can piggy-back on that.
1274 if (rdev2
->raid_disk
< 0 ||
1275 test_bit(Faulty
, &rdev2
->flags
))
1278 desc_nr
= rdev2
->raid_disk
;
1280 desc_nr
= next_spare
++;
1281 rdev2
->desc_nr
= desc_nr
;
1282 d
= &sb
->disks
[rdev2
->desc_nr
];
1284 d
->number
= rdev2
->desc_nr
;
1285 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1286 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1288 d
->raid_disk
= rdev2
->raid_disk
;
1290 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1291 if (test_bit(Faulty
, &rdev2
->flags
))
1292 d
->state
= (1<<MD_DISK_FAULTY
);
1293 else if (is_active
) {
1294 d
->state
= (1<<MD_DISK_ACTIVE
);
1295 if (test_bit(In_sync
, &rdev2
->flags
))
1296 d
->state
|= (1<<MD_DISK_SYNC
);
1304 if (test_bit(WriteMostly
, &rdev2
->flags
))
1305 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1307 /* now set the "removed" and "faulty" bits on any missing devices */
1308 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1309 mdp_disk_t
*d
= &sb
->disks
[i
];
1310 if (d
->state
== 0 && d
->number
== 0) {
1313 d
->state
= (1<<MD_DISK_REMOVED
);
1314 d
->state
|= (1<<MD_DISK_FAULTY
);
1318 sb
->nr_disks
= nr_disks
;
1319 sb
->active_disks
= active
;
1320 sb
->working_disks
= working
;
1321 sb
->failed_disks
= failed
;
1322 sb
->spare_disks
= spare
;
1324 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1325 sb
->sb_csum
= calc_sb_csum(sb
);
1329 * rdev_size_change for 0.90.0
1331 static unsigned long long
1332 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1334 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1335 return 0; /* component must fit device */
1336 if (rdev
->mddev
->bitmap_info
.offset
)
1337 return 0; /* can't move bitmap */
1338 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1339 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1340 num_sectors
= rdev
->sb_start
;
1341 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1343 md_super_wait(rdev
->mddev
);
1349 * version 1 superblock
1352 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1356 unsigned long long newcsum
;
1357 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1358 __le32
*isuper
= (__le32
*)sb
;
1361 disk_csum
= sb
->sb_csum
;
1364 for (i
=0; size
>=4; size
-= 4 )
1365 newcsum
+= le32_to_cpu(*isuper
++);
1368 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1370 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1371 sb
->sb_csum
= disk_csum
;
1372 return cpu_to_le32(csum
);
1375 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1377 struct mdp_superblock_1
*sb
;
1380 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1384 * Calculate the position of the superblock in 512byte sectors.
1385 * It is always aligned to a 4K boundary and
1386 * depeding on minor_version, it can be:
1387 * 0: At least 8K, but less than 12K, from end of device
1388 * 1: At start of device
1389 * 2: 4K from start of device.
1391 switch(minor_version
) {
1393 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1395 sb_start
&= ~(sector_t
)(4*2-1);
1406 rdev
->sb_start
= sb_start
;
1408 /* superblock is rarely larger than 1K, but it can be larger,
1409 * and it is safe to read 4k, so we do that
1411 ret
= read_disk_sb(rdev
, 4096);
1412 if (ret
) return ret
;
1415 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1417 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1418 sb
->major_version
!= cpu_to_le32(1) ||
1419 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1420 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1421 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1424 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1425 printk("md: invalid superblock checksum on %s\n",
1426 bdevname(rdev
->bdev
,b
));
1429 if (le64_to_cpu(sb
->data_size
) < 10) {
1430 printk("md: data_size too small on %s\n",
1431 bdevname(rdev
->bdev
,b
));
1435 rdev
->preferred_minor
= 0xffff;
1436 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1437 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1439 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1440 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1441 if (rdev
->sb_size
& bmask
)
1442 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1445 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1448 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1451 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1457 struct mdp_superblock_1
*refsb
=
1458 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1460 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1461 sb
->level
!= refsb
->level
||
1462 sb
->layout
!= refsb
->layout
||
1463 sb
->chunksize
!= refsb
->chunksize
) {
1464 printk(KERN_WARNING
"md: %s has strangely different"
1465 " superblock to %s\n",
1466 bdevname(rdev
->bdev
,b
),
1467 bdevname(refdev
->bdev
,b2
));
1470 ev1
= le64_to_cpu(sb
->events
);
1471 ev2
= le64_to_cpu(refsb
->events
);
1479 rdev
->sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
1480 le64_to_cpu(sb
->data_offset
);
1482 rdev
->sectors
= rdev
->sb_start
;
1483 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1485 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1486 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1491 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1493 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1494 __u64 ev1
= le64_to_cpu(sb
->events
);
1496 rdev
->raid_disk
= -1;
1497 clear_bit(Faulty
, &rdev
->flags
);
1498 clear_bit(In_sync
, &rdev
->flags
);
1499 clear_bit(WriteMostly
, &rdev
->flags
);
1501 if (mddev
->raid_disks
== 0) {
1502 mddev
->major_version
= 1;
1503 mddev
->patch_version
= 0;
1504 mddev
->external
= 0;
1505 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1506 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1507 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1508 mddev
->level
= le32_to_cpu(sb
->level
);
1509 mddev
->clevel
[0] = 0;
1510 mddev
->layout
= le32_to_cpu(sb
->layout
);
1511 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1512 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1513 mddev
->events
= ev1
;
1514 mddev
->bitmap_info
.offset
= 0;
1515 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1517 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1518 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1520 mddev
->max_disks
= (4096-256)/2;
1522 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1523 mddev
->bitmap_info
.file
== NULL
)
1524 mddev
->bitmap_info
.offset
=
1525 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1527 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1528 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1529 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1530 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1531 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1532 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1534 mddev
->reshape_position
= MaxSector
;
1535 mddev
->delta_disks
= 0;
1536 mddev
->new_level
= mddev
->level
;
1537 mddev
->new_layout
= mddev
->layout
;
1538 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1541 } else if (mddev
->pers
== NULL
) {
1542 /* Insist of good event counter while assembling, except for
1543 * spares (which don't need an event count) */
1545 if (rdev
->desc_nr
>= 0 &&
1546 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1547 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1548 if (ev1
< mddev
->events
)
1550 } else if (mddev
->bitmap
) {
1551 /* If adding to array with a bitmap, then we can accept an
1552 * older device, but not too old.
1554 if (ev1
< mddev
->bitmap
->events_cleared
)
1557 if (ev1
< mddev
->events
)
1558 /* just a hot-add of a new device, leave raid_disk at -1 */
1561 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1563 if (rdev
->desc_nr
< 0 ||
1564 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1568 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1570 case 0xffff: /* spare */
1572 case 0xfffe: /* faulty */
1573 set_bit(Faulty
, &rdev
->flags
);
1576 if ((le32_to_cpu(sb
->feature_map
) &
1577 MD_FEATURE_RECOVERY_OFFSET
))
1578 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1580 set_bit(In_sync
, &rdev
->flags
);
1581 rdev
->raid_disk
= role
;
1584 if (sb
->devflags
& WriteMostly1
)
1585 set_bit(WriteMostly
, &rdev
->flags
);
1586 } else /* MULTIPATH are always insync */
1587 set_bit(In_sync
, &rdev
->flags
);
1592 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1594 struct mdp_superblock_1
*sb
;
1597 /* make rdev->sb match mddev and rdev data. */
1599 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1601 sb
->feature_map
= 0;
1603 sb
->recovery_offset
= cpu_to_le64(0);
1604 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1605 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1606 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1608 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1609 sb
->events
= cpu_to_le64(mddev
->events
);
1611 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1613 sb
->resync_offset
= cpu_to_le64(0);
1615 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1617 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1618 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1619 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1620 sb
->level
= cpu_to_le32(mddev
->level
);
1621 sb
->layout
= cpu_to_le32(mddev
->layout
);
1623 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1624 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1625 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1628 if (rdev
->raid_disk
>= 0 &&
1629 !test_bit(In_sync
, &rdev
->flags
)) {
1631 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1632 sb
->recovery_offset
=
1633 cpu_to_le64(rdev
->recovery_offset
);
1636 if (mddev
->reshape_position
!= MaxSector
) {
1637 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1638 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1639 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1640 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1641 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1642 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1646 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1647 if (rdev2
->desc_nr
+1 > max_dev
)
1648 max_dev
= rdev2
->desc_nr
+1;
1650 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1652 sb
->max_dev
= cpu_to_le32(max_dev
);
1653 rdev
->sb_size
= max_dev
* 2 + 256;
1654 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1655 if (rdev
->sb_size
& bmask
)
1656 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1658 max_dev
= le32_to_cpu(sb
->max_dev
);
1660 for (i
=0; i
<max_dev
;i
++)
1661 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1663 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1665 if (test_bit(Faulty
, &rdev2
->flags
))
1666 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1667 else if (test_bit(In_sync
, &rdev2
->flags
))
1668 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1669 else if (rdev2
->raid_disk
>= 0)
1670 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1672 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1675 sb
->sb_csum
= calc_sb_1_csum(sb
);
1678 static unsigned long long
1679 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1681 struct mdp_superblock_1
*sb
;
1682 sector_t max_sectors
;
1683 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1684 return 0; /* component must fit device */
1685 if (rdev
->sb_start
< rdev
->data_offset
) {
1686 /* minor versions 1 and 2; superblock before data */
1687 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1688 max_sectors
-= rdev
->data_offset
;
1689 if (!num_sectors
|| num_sectors
> max_sectors
)
1690 num_sectors
= max_sectors
;
1691 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1692 /* minor version 0 with bitmap we can't move */
1695 /* minor version 0; superblock after data */
1697 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1698 sb_start
&= ~(sector_t
)(4*2 - 1);
1699 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1700 if (!num_sectors
|| num_sectors
> max_sectors
)
1701 num_sectors
= max_sectors
;
1702 rdev
->sb_start
= sb_start
;
1704 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1705 sb
->data_size
= cpu_to_le64(num_sectors
);
1706 sb
->super_offset
= rdev
->sb_start
;
1707 sb
->sb_csum
= calc_sb_1_csum(sb
);
1708 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1710 md_super_wait(rdev
->mddev
);
1714 static struct super_type super_types
[] = {
1717 .owner
= THIS_MODULE
,
1718 .load_super
= super_90_load
,
1719 .validate_super
= super_90_validate
,
1720 .sync_super
= super_90_sync
,
1721 .rdev_size_change
= super_90_rdev_size_change
,
1725 .owner
= THIS_MODULE
,
1726 .load_super
= super_1_load
,
1727 .validate_super
= super_1_validate
,
1728 .sync_super
= super_1_sync
,
1729 .rdev_size_change
= super_1_rdev_size_change
,
1733 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1735 mdk_rdev_t
*rdev
, *rdev2
;
1738 rdev_for_each_rcu(rdev
, mddev1
)
1739 rdev_for_each_rcu(rdev2
, mddev2
)
1740 if (rdev
->bdev
->bd_contains
==
1741 rdev2
->bdev
->bd_contains
) {
1749 static LIST_HEAD(pending_raid_disks
);
1752 * Try to register data integrity profile for an mddev
1754 * This is called when an array is started and after a disk has been kicked
1755 * from the array. It only succeeds if all working and active component devices
1756 * are integrity capable with matching profiles.
1758 int md_integrity_register(mddev_t
*mddev
)
1760 mdk_rdev_t
*rdev
, *reference
= NULL
;
1762 if (list_empty(&mddev
->disks
))
1763 return 0; /* nothing to do */
1764 if (blk_get_integrity(mddev
->gendisk
))
1765 return 0; /* already registered */
1766 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1767 /* skip spares and non-functional disks */
1768 if (test_bit(Faulty
, &rdev
->flags
))
1770 if (rdev
->raid_disk
< 0)
1773 * If at least one rdev is not integrity capable, we can not
1774 * enable data integrity for the md device.
1776 if (!bdev_get_integrity(rdev
->bdev
))
1779 /* Use the first rdev as the reference */
1783 /* does this rdev's profile match the reference profile? */
1784 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1785 rdev
->bdev
->bd_disk
) < 0)
1789 * All component devices are integrity capable and have matching
1790 * profiles, register the common profile for the md device.
1792 if (blk_integrity_register(mddev
->gendisk
,
1793 bdev_get_integrity(reference
->bdev
)) != 0) {
1794 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1798 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1802 EXPORT_SYMBOL(md_integrity_register
);
1804 /* Disable data integrity if non-capable/non-matching disk is being added */
1805 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1807 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1808 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1810 if (!bi_mddev
) /* nothing to do */
1812 if (rdev
->raid_disk
< 0) /* skip spares */
1814 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1815 rdev
->bdev
->bd_disk
) >= 0)
1817 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1818 blk_integrity_unregister(mddev
->gendisk
);
1820 EXPORT_SYMBOL(md_integrity_add_rdev
);
1822 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1824 char b
[BDEVNAME_SIZE
];
1834 /* prevent duplicates */
1835 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1838 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1839 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1840 rdev
->sectors
< mddev
->dev_sectors
)) {
1842 /* Cannot change size, so fail
1843 * If mddev->level <= 0, then we don't care
1844 * about aligning sizes (e.g. linear)
1846 if (mddev
->level
> 0)
1849 mddev
->dev_sectors
= rdev
->sectors
;
1852 /* Verify rdev->desc_nr is unique.
1853 * If it is -1, assign a free number, else
1854 * check number is not in use
1856 if (rdev
->desc_nr
< 0) {
1858 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1859 while (find_rdev_nr(mddev
, choice
))
1861 rdev
->desc_nr
= choice
;
1863 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1866 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1867 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1868 mdname(mddev
), mddev
->max_disks
);
1871 bdevname(rdev
->bdev
,b
);
1872 while ( (s
=strchr(b
, '/')) != NULL
)
1875 rdev
->mddev
= mddev
;
1876 printk(KERN_INFO
"md: bind<%s>\n", b
);
1878 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1881 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1882 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1883 /* failure here is OK */;
1884 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1886 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1887 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1889 /* May as well allow recovery to be retried once */
1890 mddev
->recovery_disabled
= 0;
1895 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1900 static void md_delayed_delete(struct work_struct
*ws
)
1902 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1903 kobject_del(&rdev
->kobj
);
1904 kobject_put(&rdev
->kobj
);
1907 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1909 char b
[BDEVNAME_SIZE
];
1914 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
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
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1944 printk(KERN_ERR
"md: could not open %s.\n",
1945 __bdevname(dev
, b
));
1946 return PTR_ERR(bdev
);
1948 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1950 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1952 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1956 set_bit(AllReserved
, &rdev
->flags
);
1961 static void unlock_rdev(mdk_rdev_t
*rdev
)
1963 struct block_device
*bdev
= rdev
->bdev
;
1968 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1971 void md_autodetect_dev(dev_t dev
);
1973 static void export_rdev(mdk_rdev_t
* rdev
)
1975 char b
[BDEVNAME_SIZE
];
1976 printk(KERN_INFO
"md: export_rdev(%s)\n",
1977 bdevname(rdev
->bdev
,b
));
1982 if (test_bit(AutoDetected
, &rdev
->flags
))
1983 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1986 kobject_put(&rdev
->kobj
);
1989 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1991 unbind_rdev_from_array(rdev
);
1995 static void export_array(mddev_t
*mddev
)
1997 mdk_rdev_t
*rdev
, *tmp
;
1999 rdev_for_each(rdev
, tmp
, mddev
) {
2004 kick_rdev_from_array(rdev
);
2006 if (!list_empty(&mddev
->disks
))
2008 mddev
->raid_disks
= 0;
2009 mddev
->major_version
= 0;
2012 static void print_desc(mdp_disk_t
*desc
)
2014 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2015 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2018 static void print_sb_90(mdp_super_t
*sb
)
2023 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2024 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2025 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2027 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2028 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2029 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2030 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2031 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2032 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2033 sb
->failed_disks
, sb
->spare_disks
,
2034 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2037 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2040 desc
= sb
->disks
+ i
;
2041 if (desc
->number
|| desc
->major
|| desc
->minor
||
2042 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2043 printk(" D %2d: ", i
);
2047 printk(KERN_INFO
"md: THIS: ");
2048 print_desc(&sb
->this_disk
);
2051 static void print_sb_1(struct mdp_superblock_1
*sb
)
2055 uuid
= sb
->set_uuid
;
2057 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2058 "md: Name: \"%s\" CT:%llu\n",
2059 le32_to_cpu(sb
->major_version
),
2060 le32_to_cpu(sb
->feature_map
),
2063 (unsigned long long)le64_to_cpu(sb
->ctime
)
2064 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2066 uuid
= sb
->device_uuid
;
2068 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2070 "md: Dev:%08x UUID: %pU\n"
2071 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2072 "md: (MaxDev:%u) \n",
2073 le32_to_cpu(sb
->level
),
2074 (unsigned long long)le64_to_cpu(sb
->size
),
2075 le32_to_cpu(sb
->raid_disks
),
2076 le32_to_cpu(sb
->layout
),
2077 le32_to_cpu(sb
->chunksize
),
2078 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2079 (unsigned long long)le64_to_cpu(sb
->data_size
),
2080 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2081 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2082 le32_to_cpu(sb
->dev_number
),
2085 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2086 (unsigned long long)le64_to_cpu(sb
->events
),
2087 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2088 le32_to_cpu(sb
->sb_csum
),
2089 le32_to_cpu(sb
->max_dev
)
2093 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2095 char b
[BDEVNAME_SIZE
];
2096 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2097 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2098 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2100 if (rdev
->sb_loaded
) {
2101 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2102 switch (major_version
) {
2104 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2107 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2111 printk(KERN_INFO
"md: no rdev superblock!\n");
2114 static void md_print_devices(void)
2116 struct list_head
*tmp
;
2119 char b
[BDEVNAME_SIZE
];
2122 printk("md: **********************************\n");
2123 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2124 printk("md: **********************************\n");
2125 for_each_mddev(mddev
, tmp
) {
2128 bitmap_print_sb(mddev
->bitmap
);
2130 printk("%s: ", mdname(mddev
));
2131 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2132 printk("<%s>", bdevname(rdev
->bdev
,b
));
2135 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2136 print_rdev(rdev
, mddev
->major_version
);
2138 printk("md: **********************************\n");
2143 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2145 /* Update each superblock (in-memory image), but
2146 * if we are allowed to, skip spares which already
2147 * have the right event counter, or have one earlier
2148 * (which would mean they aren't being marked as dirty
2149 * with the rest of the array)
2152 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2153 if (rdev
->sb_events
== mddev
->events
||
2155 rdev
->raid_disk
< 0 &&
2156 rdev
->sb_events
+1 == mddev
->events
)) {
2157 /* Don't update this superblock */
2158 rdev
->sb_loaded
= 2;
2160 super_types
[mddev
->major_version
].
2161 sync_super(mddev
, rdev
);
2162 rdev
->sb_loaded
= 1;
2167 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2174 /* First make sure individual recovery_offsets are correct */
2175 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2176 if (rdev
->raid_disk
>= 0 &&
2177 mddev
->delta_disks
>= 0 &&
2178 !test_bit(In_sync
, &rdev
->flags
) &&
2179 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2180 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2183 if (!mddev
->persistent
) {
2184 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2185 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2186 if (!mddev
->external
)
2187 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2188 wake_up(&mddev
->sb_wait
);
2192 spin_lock_irq(&mddev
->write_lock
);
2194 mddev
->utime
= get_seconds();
2196 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2198 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2199 /* just a clean<-> dirty transition, possibly leave spares alone,
2200 * though if events isn't the right even/odd, we will have to do
2206 if (mddev
->degraded
)
2207 /* If the array is degraded, then skipping spares is both
2208 * dangerous and fairly pointless.
2209 * Dangerous because a device that was removed from the array
2210 * might have a event_count that still looks up-to-date,
2211 * so it can be re-added without a resync.
2212 * Pointless because if there are any spares to skip,
2213 * then a recovery will happen and soon that array won't
2214 * be degraded any more and the spare can go back to sleep then.
2218 sync_req
= mddev
->in_sync
;
2220 /* If this is just a dirty<->clean transition, and the array is clean
2221 * and 'events' is odd, we can roll back to the previous clean state */
2223 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2224 && mddev
->can_decrease_events
2225 && mddev
->events
!= 1) {
2227 mddev
->can_decrease_events
= 0;
2229 /* otherwise we have to go forward and ... */
2231 mddev
->can_decrease_events
= nospares
;
2234 if (!mddev
->events
) {
2236 * oops, this 64-bit counter should never wrap.
2237 * Either we are in around ~1 trillion A.C., assuming
2238 * 1 reboot per second, or we have a bug:
2243 sync_sbs(mddev
, nospares
);
2244 spin_unlock_irq(&mddev
->write_lock
);
2247 "md: updating %s RAID superblock on device (in sync %d)\n",
2248 mdname(mddev
),mddev
->in_sync
);
2250 bitmap_update_sb(mddev
->bitmap
);
2251 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2252 char b
[BDEVNAME_SIZE
];
2253 dprintk(KERN_INFO
"md: ");
2254 if (rdev
->sb_loaded
!= 1)
2255 continue; /* no noise on spare devices */
2256 if (test_bit(Faulty
, &rdev
->flags
))
2257 dprintk("(skipping faulty ");
2259 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2260 if (!test_bit(Faulty
, &rdev
->flags
)) {
2261 md_super_write(mddev
,rdev
,
2262 rdev
->sb_start
, rdev
->sb_size
,
2264 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2265 bdevname(rdev
->bdev
,b
),
2266 (unsigned long long)rdev
->sb_start
);
2267 rdev
->sb_events
= mddev
->events
;
2271 if (mddev
->level
== LEVEL_MULTIPATH
)
2272 /* only need to write one superblock... */
2275 md_super_wait(mddev
);
2276 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2278 spin_lock_irq(&mddev
->write_lock
);
2279 if (mddev
->in_sync
!= sync_req
||
2280 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2281 /* have to write it out again */
2282 spin_unlock_irq(&mddev
->write_lock
);
2285 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2286 spin_unlock_irq(&mddev
->write_lock
);
2287 wake_up(&mddev
->sb_wait
);
2288 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2289 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2293 /* words written to sysfs files may, or may not, be \n terminated.
2294 * We want to accept with case. For this we use cmd_match.
2296 static int cmd_match(const char *cmd
, const char *str
)
2298 /* See if cmd, written into a sysfs file, matches
2299 * str. They must either be the same, or cmd can
2300 * have a trailing newline
2302 while (*cmd
&& *str
&& *cmd
== *str
) {
2313 struct rdev_sysfs_entry
{
2314 struct attribute attr
;
2315 ssize_t (*show
)(mdk_rdev_t
*, char *);
2316 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2320 state_show(mdk_rdev_t
*rdev
, char *page
)
2325 if (test_bit(Faulty
, &rdev
->flags
)) {
2326 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2329 if (test_bit(In_sync
, &rdev
->flags
)) {
2330 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2333 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2334 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2337 if (test_bit(Blocked
, &rdev
->flags
)) {
2338 len
+= sprintf(page
+len
, "%sblocked", sep
);
2341 if (!test_bit(Faulty
, &rdev
->flags
) &&
2342 !test_bit(In_sync
, &rdev
->flags
)) {
2343 len
+= sprintf(page
+len
, "%sspare", sep
);
2346 return len
+sprintf(page
+len
, "\n");
2350 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2353 * faulty - simulates and error
2354 * remove - disconnects the device
2355 * writemostly - sets write_mostly
2356 * -writemostly - clears write_mostly
2357 * blocked - sets the Blocked flag
2358 * -blocked - clears the Blocked flag
2359 * insync - sets Insync providing device isn't active
2362 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2363 md_error(rdev
->mddev
, rdev
);
2365 } else if (cmd_match(buf
, "remove")) {
2366 if (rdev
->raid_disk
>= 0)
2369 mddev_t
*mddev
= rdev
->mddev
;
2370 kick_rdev_from_array(rdev
);
2372 md_update_sb(mddev
, 1);
2373 md_new_event(mddev
);
2376 } else if (cmd_match(buf
, "writemostly")) {
2377 set_bit(WriteMostly
, &rdev
->flags
);
2379 } else if (cmd_match(buf
, "-writemostly")) {
2380 clear_bit(WriteMostly
, &rdev
->flags
);
2382 } else if (cmd_match(buf
, "blocked")) {
2383 set_bit(Blocked
, &rdev
->flags
);
2385 } else if (cmd_match(buf
, "-blocked")) {
2386 clear_bit(Blocked
, &rdev
->flags
);
2387 wake_up(&rdev
->blocked_wait
);
2388 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2389 md_wakeup_thread(rdev
->mddev
->thread
);
2392 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2393 set_bit(In_sync
, &rdev
->flags
);
2397 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2398 return err
? err
: len
;
2400 static struct rdev_sysfs_entry rdev_state
=
2401 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2404 errors_show(mdk_rdev_t
*rdev
, char *page
)
2406 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2410 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2413 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2414 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2415 atomic_set(&rdev
->corrected_errors
, n
);
2420 static struct rdev_sysfs_entry rdev_errors
=
2421 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2424 slot_show(mdk_rdev_t
*rdev
, char *page
)
2426 if (rdev
->raid_disk
< 0)
2427 return sprintf(page
, "none\n");
2429 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2433 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2438 int slot
= simple_strtoul(buf
, &e
, 10);
2439 if (strncmp(buf
, "none", 4)==0)
2441 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2443 if (rdev
->mddev
->pers
&& slot
== -1) {
2444 /* Setting 'slot' on an active array requires also
2445 * updating the 'rd%d' link, and communicating
2446 * with the personality with ->hot_*_disk.
2447 * For now we only support removing
2448 * failed/spare devices. This normally happens automatically,
2449 * but not when the metadata is externally managed.
2451 if (rdev
->raid_disk
== -1)
2453 /* personality does all needed checks */
2454 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2456 err
= rdev
->mddev
->pers
->
2457 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2460 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2461 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2462 rdev
->raid_disk
= -1;
2463 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2464 md_wakeup_thread(rdev
->mddev
->thread
);
2465 } else if (rdev
->mddev
->pers
) {
2467 /* Activating a spare .. or possibly reactivating
2468 * if we ever get bitmaps working here.
2471 if (rdev
->raid_disk
!= -1)
2474 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2477 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2478 if (rdev2
->raid_disk
== slot
)
2481 rdev
->raid_disk
= slot
;
2482 if (test_bit(In_sync
, &rdev
->flags
))
2483 rdev
->saved_raid_disk
= slot
;
2485 rdev
->saved_raid_disk
= -1;
2486 err
= rdev
->mddev
->pers
->
2487 hot_add_disk(rdev
->mddev
, rdev
);
2489 rdev
->raid_disk
= -1;
2492 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2493 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2494 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2495 /* failure here is OK */;
2496 /* don't wakeup anyone, leave that to userspace. */
2498 if (slot
>= rdev
->mddev
->raid_disks
)
2500 rdev
->raid_disk
= slot
;
2501 /* assume it is working */
2502 clear_bit(Faulty
, &rdev
->flags
);
2503 clear_bit(WriteMostly
, &rdev
->flags
);
2504 set_bit(In_sync
, &rdev
->flags
);
2505 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2511 static struct rdev_sysfs_entry rdev_slot
=
2512 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2515 offset_show(mdk_rdev_t
*rdev
, char *page
)
2517 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2521 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2524 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2525 if (e
==buf
|| (*e
&& *e
!= '\n'))
2527 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2529 if (rdev
->sectors
&& rdev
->mddev
->external
)
2530 /* Must set offset before size, so overlap checks
2533 rdev
->data_offset
= offset
;
2537 static struct rdev_sysfs_entry rdev_offset
=
2538 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2541 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2543 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2546 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2548 /* check if two start/length pairs overlap */
2556 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2558 unsigned long long blocks
;
2561 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2564 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2565 return -EINVAL
; /* sector conversion overflow */
2568 if (new != blocks
* 2)
2569 return -EINVAL
; /* unsigned long long to sector_t overflow */
2576 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2578 mddev_t
*my_mddev
= rdev
->mddev
;
2579 sector_t oldsectors
= rdev
->sectors
;
2582 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2584 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2585 if (my_mddev
->persistent
) {
2586 sectors
= super_types
[my_mddev
->major_version
].
2587 rdev_size_change(rdev
, sectors
);
2590 } else if (!sectors
)
2591 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2594 if (sectors
< my_mddev
->dev_sectors
)
2595 return -EINVAL
; /* component must fit device */
2597 rdev
->sectors
= sectors
;
2598 if (sectors
> oldsectors
&& my_mddev
->external
) {
2599 /* need to check that all other rdevs with the same ->bdev
2600 * do not overlap. We need to unlock the mddev to avoid
2601 * a deadlock. We have already changed rdev->sectors, and if
2602 * we have to change it back, we will have the lock again.
2606 struct list_head
*tmp
;
2608 mddev_unlock(my_mddev
);
2609 for_each_mddev(mddev
, tmp
) {
2613 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2614 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2615 (rdev
->bdev
== rdev2
->bdev
&&
2617 overlaps(rdev
->data_offset
, rdev
->sectors
,
2623 mddev_unlock(mddev
);
2629 mddev_lock(my_mddev
);
2631 /* Someone else could have slipped in a size
2632 * change here, but doing so is just silly.
2633 * We put oldsectors back because we *know* it is
2634 * safe, and trust userspace not to race with
2637 rdev
->sectors
= oldsectors
;
2644 static struct rdev_sysfs_entry rdev_size
=
2645 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2648 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2650 unsigned long long recovery_start
= rdev
->recovery_offset
;
2652 if (test_bit(In_sync
, &rdev
->flags
) ||
2653 recovery_start
== MaxSector
)
2654 return sprintf(page
, "none\n");
2656 return sprintf(page
, "%llu\n", recovery_start
);
2659 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2661 unsigned long long recovery_start
;
2663 if (cmd_match(buf
, "none"))
2664 recovery_start
= MaxSector
;
2665 else if (strict_strtoull(buf
, 10, &recovery_start
))
2668 if (rdev
->mddev
->pers
&&
2669 rdev
->raid_disk
>= 0)
2672 rdev
->recovery_offset
= recovery_start
;
2673 if (recovery_start
== MaxSector
)
2674 set_bit(In_sync
, &rdev
->flags
);
2676 clear_bit(In_sync
, &rdev
->flags
);
2680 static struct rdev_sysfs_entry rdev_recovery_start
=
2681 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2683 static struct attribute
*rdev_default_attrs
[] = {
2689 &rdev_recovery_start
.attr
,
2693 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2695 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2696 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2697 mddev_t
*mddev
= rdev
->mddev
;
2703 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2705 if (rdev
->mddev
== NULL
)
2708 rv
= entry
->show(rdev
, page
);
2709 mddev_unlock(mddev
);
2715 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2716 const char *page
, size_t length
)
2718 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2719 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2721 mddev_t
*mddev
= rdev
->mddev
;
2725 if (!capable(CAP_SYS_ADMIN
))
2727 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2729 if (rdev
->mddev
== NULL
)
2732 rv
= entry
->store(rdev
, page
, length
);
2733 mddev_unlock(mddev
);
2738 static void rdev_free(struct kobject
*ko
)
2740 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2743 static const struct sysfs_ops rdev_sysfs_ops
= {
2744 .show
= rdev_attr_show
,
2745 .store
= rdev_attr_store
,
2747 static struct kobj_type rdev_ktype
= {
2748 .release
= rdev_free
,
2749 .sysfs_ops
= &rdev_sysfs_ops
,
2750 .default_attrs
= rdev_default_attrs
,
2753 void md_rdev_init(mdk_rdev_t
*rdev
)
2756 rdev
->saved_raid_disk
= -1;
2757 rdev
->raid_disk
= -1;
2759 rdev
->data_offset
= 0;
2760 rdev
->sb_events
= 0;
2761 rdev
->last_read_error
.tv_sec
= 0;
2762 rdev
->last_read_error
.tv_nsec
= 0;
2763 atomic_set(&rdev
->nr_pending
, 0);
2764 atomic_set(&rdev
->read_errors
, 0);
2765 atomic_set(&rdev
->corrected_errors
, 0);
2767 INIT_LIST_HEAD(&rdev
->same_set
);
2768 init_waitqueue_head(&rdev
->blocked_wait
);
2770 EXPORT_SYMBOL_GPL(md_rdev_init
);
2772 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2774 * mark the device faulty if:
2776 * - the device is nonexistent (zero size)
2777 * - the device has no valid superblock
2779 * a faulty rdev _never_ has rdev->sb set.
2781 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2783 char b
[BDEVNAME_SIZE
];
2788 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2790 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2791 return ERR_PTR(-ENOMEM
);
2795 if ((err
= alloc_disk_sb(rdev
)))
2798 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2802 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2804 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
2807 "md: %s has zero or unknown size, marking faulty!\n",
2808 bdevname(rdev
->bdev
,b
));
2813 if (super_format
>= 0) {
2814 err
= super_types
[super_format
].
2815 load_super(rdev
, NULL
, super_minor
);
2816 if (err
== -EINVAL
) {
2818 "md: %s does not have a valid v%d.%d "
2819 "superblock, not importing!\n",
2820 bdevname(rdev
->bdev
,b
),
2821 super_format
, super_minor
);
2826 "md: could not read %s's sb, not importing!\n",
2827 bdevname(rdev
->bdev
,b
));
2835 if (rdev
->sb_page
) {
2841 return ERR_PTR(err
);
2845 * Check a full RAID array for plausibility
2849 static void analyze_sbs(mddev_t
* mddev
)
2852 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2853 char b
[BDEVNAME_SIZE
];
2856 rdev_for_each(rdev
, tmp
, mddev
)
2857 switch (super_types
[mddev
->major_version
].
2858 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2866 "md: fatal superblock inconsistency in %s"
2867 " -- removing from array\n",
2868 bdevname(rdev
->bdev
,b
));
2869 kick_rdev_from_array(rdev
);
2873 super_types
[mddev
->major_version
].
2874 validate_super(mddev
, freshest
);
2877 rdev_for_each(rdev
, tmp
, mddev
) {
2878 if (mddev
->max_disks
&&
2879 (rdev
->desc_nr
>= mddev
->max_disks
||
2880 i
> mddev
->max_disks
)) {
2882 "md: %s: %s: only %d devices permitted\n",
2883 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2885 kick_rdev_from_array(rdev
);
2888 if (rdev
!= freshest
)
2889 if (super_types
[mddev
->major_version
].
2890 validate_super(mddev
, rdev
)) {
2891 printk(KERN_WARNING
"md: kicking non-fresh %s"
2893 bdevname(rdev
->bdev
,b
));
2894 kick_rdev_from_array(rdev
);
2897 if (mddev
->level
== LEVEL_MULTIPATH
) {
2898 rdev
->desc_nr
= i
++;
2899 rdev
->raid_disk
= rdev
->desc_nr
;
2900 set_bit(In_sync
, &rdev
->flags
);
2901 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2902 rdev
->raid_disk
= -1;
2903 clear_bit(In_sync
, &rdev
->flags
);
2908 /* Read a fixed-point number.
2909 * Numbers in sysfs attributes should be in "standard" units where
2910 * possible, so time should be in seconds.
2911 * However we internally use a a much smaller unit such as
2912 * milliseconds or jiffies.
2913 * This function takes a decimal number with a possible fractional
2914 * component, and produces an integer which is the result of
2915 * multiplying that number by 10^'scale'.
2916 * all without any floating-point arithmetic.
2918 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2920 unsigned long result
= 0;
2922 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2925 else if (decimals
< scale
) {
2928 result
= result
* 10 + value
;
2940 while (decimals
< scale
) {
2949 static void md_safemode_timeout(unsigned long data
);
2952 safe_delay_show(mddev_t
*mddev
, char *page
)
2954 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2955 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2958 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2962 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2965 mddev
->safemode_delay
= 0;
2967 unsigned long old_delay
= mddev
->safemode_delay
;
2968 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2969 if (mddev
->safemode_delay
== 0)
2970 mddev
->safemode_delay
= 1;
2971 if (mddev
->safemode_delay
< old_delay
)
2972 md_safemode_timeout((unsigned long)mddev
);
2976 static struct md_sysfs_entry md_safe_delay
=
2977 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2980 level_show(mddev_t
*mddev
, char *page
)
2982 struct mdk_personality
*p
= mddev
->pers
;
2984 return sprintf(page
, "%s\n", p
->name
);
2985 else if (mddev
->clevel
[0])
2986 return sprintf(page
, "%s\n", mddev
->clevel
);
2987 else if (mddev
->level
!= LEVEL_NONE
)
2988 return sprintf(page
, "%d\n", mddev
->level
);
2994 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2998 struct mdk_personality
*pers
;
3003 if (mddev
->pers
== NULL
) {
3006 if (len
>= sizeof(mddev
->clevel
))
3008 strncpy(mddev
->clevel
, buf
, len
);
3009 if (mddev
->clevel
[len
-1] == '\n')
3011 mddev
->clevel
[len
] = 0;
3012 mddev
->level
= LEVEL_NONE
;
3016 /* request to change the personality. Need to ensure:
3017 * - array is not engaged in resync/recovery/reshape
3018 * - old personality can be suspended
3019 * - new personality will access other array.
3022 if (mddev
->sync_thread
||
3023 mddev
->reshape_position
!= MaxSector
||
3024 mddev
->sysfs_active
)
3027 if (!mddev
->pers
->quiesce
) {
3028 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3029 mdname(mddev
), mddev
->pers
->name
);
3033 /* Now find the new personality */
3034 if (len
== 0 || len
>= sizeof(clevel
))
3036 strncpy(clevel
, buf
, len
);
3037 if (clevel
[len
-1] == '\n')
3040 if (strict_strtol(clevel
, 10, &level
))
3043 if (request_module("md-%s", clevel
) != 0)
3044 request_module("md-level-%s", clevel
);
3045 spin_lock(&pers_lock
);
3046 pers
= find_pers(level
, clevel
);
3047 if (!pers
|| !try_module_get(pers
->owner
)) {
3048 spin_unlock(&pers_lock
);
3049 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3052 spin_unlock(&pers_lock
);
3054 if (pers
== mddev
->pers
) {
3055 /* Nothing to do! */
3056 module_put(pers
->owner
);
3059 if (!pers
->takeover
) {
3060 module_put(pers
->owner
);
3061 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3062 mdname(mddev
), clevel
);
3066 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3067 rdev
->new_raid_disk
= rdev
->raid_disk
;
3069 /* ->takeover must set new_* and/or delta_disks
3070 * if it succeeds, and may set them when it fails.
3072 priv
= pers
->takeover(mddev
);
3074 mddev
->new_level
= mddev
->level
;
3075 mddev
->new_layout
= mddev
->layout
;
3076 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3077 mddev
->raid_disks
-= mddev
->delta_disks
;
3078 mddev
->delta_disks
= 0;
3079 module_put(pers
->owner
);
3080 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3081 mdname(mddev
), clevel
);
3082 return PTR_ERR(priv
);
3085 /* Looks like we have a winner */
3086 mddev_suspend(mddev
);
3087 mddev
->pers
->stop(mddev
);
3089 if (mddev
->pers
->sync_request
== NULL
&&
3090 pers
->sync_request
!= NULL
) {
3091 /* need to add the md_redundancy_group */
3092 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3094 "md: cannot register extra attributes for %s\n",
3096 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3098 if (mddev
->pers
->sync_request
!= NULL
&&
3099 pers
->sync_request
== NULL
) {
3100 /* need to remove the md_redundancy_group */
3101 if (mddev
->to_remove
== NULL
)
3102 mddev
->to_remove
= &md_redundancy_group
;
3105 if (mddev
->pers
->sync_request
== NULL
&&
3107 /* We are converting from a no-redundancy array
3108 * to a redundancy array and metadata is managed
3109 * externally so we need to be sure that writes
3110 * won't block due to a need to transition
3112 * until external management is started.
3115 mddev
->safemode_delay
= 0;
3116 mddev
->safemode
= 0;
3119 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3121 if (rdev
->raid_disk
< 0)
3123 if (rdev
->new_raid_disk
> mddev
->raid_disks
)
3124 rdev
->new_raid_disk
= -1;
3125 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3127 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3128 sysfs_remove_link(&mddev
->kobj
, nm
);
3130 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3131 if (rdev
->raid_disk
< 0)
3133 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3135 rdev
->raid_disk
= rdev
->new_raid_disk
;
3136 if (rdev
->raid_disk
< 0)
3137 clear_bit(In_sync
, &rdev
->flags
);
3140 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3141 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3142 printk("md: cannot register %s for %s after level change\n",
3147 module_put(mddev
->pers
->owner
);
3149 mddev
->private = priv
;
3150 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3151 mddev
->level
= mddev
->new_level
;
3152 mddev
->layout
= mddev
->new_layout
;
3153 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3154 mddev
->delta_disks
= 0;
3155 if (mddev
->pers
->sync_request
== NULL
) {
3156 /* this is now an array without redundancy, so
3157 * it must always be in_sync
3160 del_timer_sync(&mddev
->safemode_timer
);
3163 mddev_resume(mddev
);
3164 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3165 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3166 md_wakeup_thread(mddev
->thread
);
3167 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3168 md_new_event(mddev
);
3172 static struct md_sysfs_entry md_level
=
3173 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3177 layout_show(mddev_t
*mddev
, char *page
)
3179 /* just a number, not meaningful for all levels */
3180 if (mddev
->reshape_position
!= MaxSector
&&
3181 mddev
->layout
!= mddev
->new_layout
)
3182 return sprintf(page
, "%d (%d)\n",
3183 mddev
->new_layout
, mddev
->layout
);
3184 return sprintf(page
, "%d\n", mddev
->layout
);
3188 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3191 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3193 if (!*buf
|| (*e
&& *e
!= '\n'))
3198 if (mddev
->pers
->check_reshape
== NULL
)
3200 mddev
->new_layout
= n
;
3201 err
= mddev
->pers
->check_reshape(mddev
);
3203 mddev
->new_layout
= mddev
->layout
;
3207 mddev
->new_layout
= n
;
3208 if (mddev
->reshape_position
== MaxSector
)
3213 static struct md_sysfs_entry md_layout
=
3214 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3218 raid_disks_show(mddev_t
*mddev
, char *page
)
3220 if (mddev
->raid_disks
== 0)
3222 if (mddev
->reshape_position
!= MaxSector
&&
3223 mddev
->delta_disks
!= 0)
3224 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3225 mddev
->raid_disks
- mddev
->delta_disks
);
3226 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3229 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3232 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3236 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3238 if (!*buf
|| (*e
&& *e
!= '\n'))
3242 rv
= update_raid_disks(mddev
, n
);
3243 else if (mddev
->reshape_position
!= MaxSector
) {
3244 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3245 mddev
->delta_disks
= n
- olddisks
;
3246 mddev
->raid_disks
= n
;
3248 mddev
->raid_disks
= n
;
3249 return rv
? rv
: len
;
3251 static struct md_sysfs_entry md_raid_disks
=
3252 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3255 chunk_size_show(mddev_t
*mddev
, char *page
)
3257 if (mddev
->reshape_position
!= MaxSector
&&
3258 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3259 return sprintf(page
, "%d (%d)\n",
3260 mddev
->new_chunk_sectors
<< 9,
3261 mddev
->chunk_sectors
<< 9);
3262 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3266 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3269 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3271 if (!*buf
|| (*e
&& *e
!= '\n'))
3276 if (mddev
->pers
->check_reshape
== NULL
)
3278 mddev
->new_chunk_sectors
= n
>> 9;
3279 err
= mddev
->pers
->check_reshape(mddev
);
3281 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3285 mddev
->new_chunk_sectors
= n
>> 9;
3286 if (mddev
->reshape_position
== MaxSector
)
3287 mddev
->chunk_sectors
= n
>> 9;
3291 static struct md_sysfs_entry md_chunk_size
=
3292 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3295 resync_start_show(mddev_t
*mddev
, char *page
)
3297 if (mddev
->recovery_cp
== MaxSector
)
3298 return sprintf(page
, "none\n");
3299 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3303 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3306 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3310 if (cmd_match(buf
, "none"))
3312 else if (!*buf
|| (*e
&& *e
!= '\n'))
3315 mddev
->recovery_cp
= n
;
3318 static struct md_sysfs_entry md_resync_start
=
3319 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3322 * The array state can be:
3325 * No devices, no size, no level
3326 * Equivalent to STOP_ARRAY ioctl
3328 * May have some settings, but array is not active
3329 * all IO results in error
3330 * When written, doesn't tear down array, but just stops it
3331 * suspended (not supported yet)
3332 * All IO requests will block. The array can be reconfigured.
3333 * Writing this, if accepted, will block until array is quiescent
3335 * no resync can happen. no superblocks get written.
3336 * write requests fail
3338 * like readonly, but behaves like 'clean' on a write request.
3340 * clean - no pending writes, but otherwise active.
3341 * When written to inactive array, starts without resync
3342 * If a write request arrives then
3343 * if metadata is known, mark 'dirty' and switch to 'active'.
3344 * if not known, block and switch to write-pending
3345 * If written to an active array that has pending writes, then fails.
3347 * fully active: IO and resync can be happening.
3348 * When written to inactive array, starts with resync
3351 * clean, but writes are blocked waiting for 'active' to be written.
3354 * like active, but no writes have been seen for a while (100msec).
3357 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3358 write_pending
, active_idle
, bad_word
};
3359 static char *array_states
[] = {
3360 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3361 "write-pending", "active-idle", NULL
};
3363 static int match_word(const char *word
, char **list
)
3366 for (n
=0; list
[n
]; n
++)
3367 if (cmd_match(word
, list
[n
]))
3373 array_state_show(mddev_t
*mddev
, char *page
)
3375 enum array_state st
= inactive
;
3388 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3390 else if (mddev
->safemode
)
3396 if (list_empty(&mddev
->disks
) &&
3397 mddev
->raid_disks
== 0 &&
3398 mddev
->dev_sectors
== 0)
3403 return sprintf(page
, "%s\n", array_states
[st
]);
3406 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3407 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3408 static int do_md_run(mddev_t
* mddev
);
3409 static int restart_array(mddev_t
*mddev
);
3412 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3415 enum array_state st
= match_word(buf
, array_states
);
3420 /* stopping an active array */
3421 if (atomic_read(&mddev
->openers
) > 0)
3423 err
= do_md_stop(mddev
, 0, 0);
3426 /* stopping an active array */
3428 if (atomic_read(&mddev
->openers
) > 0)
3430 err
= do_md_stop(mddev
, 2, 0);
3432 err
= 0; /* already inactive */
3435 break; /* not supported yet */
3438 err
= md_set_readonly(mddev
, 0);
3441 set_disk_ro(mddev
->gendisk
, 1);
3442 err
= do_md_run(mddev
);
3448 err
= md_set_readonly(mddev
, 0);
3449 else if (mddev
->ro
== 1)
3450 err
= restart_array(mddev
);
3453 set_disk_ro(mddev
->gendisk
, 0);
3457 err
= do_md_run(mddev
);
3462 restart_array(mddev
);
3463 spin_lock_irq(&mddev
->write_lock
);
3464 if (atomic_read(&mddev
->writes_pending
) == 0) {
3465 if (mddev
->in_sync
== 0) {
3467 if (mddev
->safemode
== 1)
3468 mddev
->safemode
= 0;
3469 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3474 spin_unlock_irq(&mddev
->write_lock
);
3480 restart_array(mddev
);
3481 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3482 wake_up(&mddev
->sb_wait
);
3486 set_disk_ro(mddev
->gendisk
, 0);
3487 err
= do_md_run(mddev
);
3492 /* these cannot be set */
3498 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3502 static struct md_sysfs_entry md_array_state
=
3503 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3506 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3507 return sprintf(page
, "%d\n",
3508 atomic_read(&mddev
->max_corr_read_errors
));
3512 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3515 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3517 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3518 atomic_set(&mddev
->max_corr_read_errors
, n
);
3524 static struct md_sysfs_entry max_corr_read_errors
=
3525 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3526 max_corrected_read_errors_store
);
3529 null_show(mddev_t
*mddev
, char *page
)
3535 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3537 /* buf must be %d:%d\n? giving major and minor numbers */
3538 /* The new device is added to the array.
3539 * If the array has a persistent superblock, we read the
3540 * superblock to initialise info and check validity.
3541 * Otherwise, only checking done is that in bind_rdev_to_array,
3542 * which mainly checks size.
3545 int major
= simple_strtoul(buf
, &e
, 10);
3551 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3553 minor
= simple_strtoul(e
+1, &e
, 10);
3554 if (*e
&& *e
!= '\n')
3556 dev
= MKDEV(major
, minor
);
3557 if (major
!= MAJOR(dev
) ||
3558 minor
!= MINOR(dev
))
3562 if (mddev
->persistent
) {
3563 rdev
= md_import_device(dev
, mddev
->major_version
,
3564 mddev
->minor_version
);
3565 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3566 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3567 mdk_rdev_t
, same_set
);
3568 err
= super_types
[mddev
->major_version
]
3569 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3573 } else if (mddev
->external
)
3574 rdev
= md_import_device(dev
, -2, -1);
3576 rdev
= md_import_device(dev
, -1, -1);
3579 return PTR_ERR(rdev
);
3580 err
= bind_rdev_to_array(rdev
, mddev
);
3584 return err
? err
: len
;
3587 static struct md_sysfs_entry md_new_device
=
3588 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3591 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3594 unsigned long chunk
, end_chunk
;
3598 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3600 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3601 if (buf
== end
) break;
3602 if (*end
== '-') { /* range */
3604 end_chunk
= simple_strtoul(buf
, &end
, 0);
3605 if (buf
== end
) break;
3607 if (*end
&& !isspace(*end
)) break;
3608 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3609 buf
= skip_spaces(end
);
3611 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3616 static struct md_sysfs_entry md_bitmap
=
3617 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3620 size_show(mddev_t
*mddev
, char *page
)
3622 return sprintf(page
, "%llu\n",
3623 (unsigned long long)mddev
->dev_sectors
/ 2);
3626 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3629 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3631 /* If array is inactive, we can reduce the component size, but
3632 * not increase it (except from 0).
3633 * If array is active, we can try an on-line resize
3636 int err
= strict_blocks_to_sectors(buf
, §ors
);
3641 err
= update_size(mddev
, sectors
);
3642 md_update_sb(mddev
, 1);
3644 if (mddev
->dev_sectors
== 0 ||
3645 mddev
->dev_sectors
> sectors
)
3646 mddev
->dev_sectors
= sectors
;
3650 return err
? err
: len
;
3653 static struct md_sysfs_entry md_size
=
3654 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3659 * 'none' for arrays with no metadata (good luck...)
3660 * 'external' for arrays with externally managed metadata,
3661 * or N.M for internally known formats
3664 metadata_show(mddev_t
*mddev
, char *page
)
3666 if (mddev
->persistent
)
3667 return sprintf(page
, "%d.%d\n",
3668 mddev
->major_version
, mddev
->minor_version
);
3669 else if (mddev
->external
)
3670 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3672 return sprintf(page
, "none\n");
3676 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3680 /* Changing the details of 'external' metadata is
3681 * always permitted. Otherwise there must be
3682 * no devices attached to the array.
3684 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3686 else if (!list_empty(&mddev
->disks
))
3689 if (cmd_match(buf
, "none")) {
3690 mddev
->persistent
= 0;
3691 mddev
->external
= 0;
3692 mddev
->major_version
= 0;
3693 mddev
->minor_version
= 90;
3696 if (strncmp(buf
, "external:", 9) == 0) {
3697 size_t namelen
= len
-9;
3698 if (namelen
>= sizeof(mddev
->metadata_type
))
3699 namelen
= sizeof(mddev
->metadata_type
)-1;
3700 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3701 mddev
->metadata_type
[namelen
] = 0;
3702 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3703 mddev
->metadata_type
[--namelen
] = 0;
3704 mddev
->persistent
= 0;
3705 mddev
->external
= 1;
3706 mddev
->major_version
= 0;
3707 mddev
->minor_version
= 90;
3710 major
= simple_strtoul(buf
, &e
, 10);
3711 if (e
==buf
|| *e
!= '.')
3714 minor
= simple_strtoul(buf
, &e
, 10);
3715 if (e
==buf
|| (*e
&& *e
!= '\n') )
3717 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3719 mddev
->major_version
= major
;
3720 mddev
->minor_version
= minor
;
3721 mddev
->persistent
= 1;
3722 mddev
->external
= 0;
3726 static struct md_sysfs_entry md_metadata
=
3727 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3730 action_show(mddev_t
*mddev
, char *page
)
3732 char *type
= "idle";
3733 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3735 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3736 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3737 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3739 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3740 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3742 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3746 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3749 return sprintf(page
, "%s\n", type
);
3752 static void reap_sync_thread(mddev_t
*mddev
);
3755 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3757 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3760 if (cmd_match(page
, "frozen"))
3761 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3763 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3765 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3766 if (mddev
->sync_thread
) {
3767 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3768 reap_sync_thread(mddev
);
3770 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3771 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3773 else if (cmd_match(page
, "resync"))
3774 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3775 else if (cmd_match(page
, "recover")) {
3776 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3777 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3778 } else if (cmd_match(page
, "reshape")) {
3780 if (mddev
->pers
->start_reshape
== NULL
)
3782 err
= mddev
->pers
->start_reshape(mddev
);
3785 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3787 if (cmd_match(page
, "check"))
3788 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3789 else if (!cmd_match(page
, "repair"))
3791 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3792 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3794 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3795 md_wakeup_thread(mddev
->thread
);
3796 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3801 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3803 return sprintf(page
, "%llu\n",
3804 (unsigned long long) mddev
->resync_mismatches
);
3807 static struct md_sysfs_entry md_scan_mode
=
3808 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3811 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3814 sync_min_show(mddev_t
*mddev
, char *page
)
3816 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3817 mddev
->sync_speed_min
? "local": "system");
3821 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3825 if (strncmp(buf
, "system", 6)==0) {
3826 mddev
->sync_speed_min
= 0;
3829 min
= simple_strtoul(buf
, &e
, 10);
3830 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3832 mddev
->sync_speed_min
= min
;
3836 static struct md_sysfs_entry md_sync_min
=
3837 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3840 sync_max_show(mddev_t
*mddev
, char *page
)
3842 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3843 mddev
->sync_speed_max
? "local": "system");
3847 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3851 if (strncmp(buf
, "system", 6)==0) {
3852 mddev
->sync_speed_max
= 0;
3855 max
= simple_strtoul(buf
, &e
, 10);
3856 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3858 mddev
->sync_speed_max
= max
;
3862 static struct md_sysfs_entry md_sync_max
=
3863 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3866 degraded_show(mddev_t
*mddev
, char *page
)
3868 return sprintf(page
, "%d\n", mddev
->degraded
);
3870 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3873 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3875 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3879 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3883 if (strict_strtol(buf
, 10, &n
))
3886 if (n
!= 0 && n
!= 1)
3889 mddev
->parallel_resync
= n
;
3891 if (mddev
->sync_thread
)
3892 wake_up(&resync_wait
);
3897 /* force parallel resync, even with shared block devices */
3898 static struct md_sysfs_entry md_sync_force_parallel
=
3899 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3900 sync_force_parallel_show
, sync_force_parallel_store
);
3903 sync_speed_show(mddev_t
*mddev
, char *page
)
3905 unsigned long resync
, dt
, db
;
3906 if (mddev
->curr_resync
== 0)
3907 return sprintf(page
, "none\n");
3908 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3909 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3911 db
= resync
- mddev
->resync_mark_cnt
;
3912 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3915 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3918 sync_completed_show(mddev_t
*mddev
, char *page
)
3920 unsigned long max_sectors
, resync
;
3922 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3923 return sprintf(page
, "none\n");
3925 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3926 max_sectors
= mddev
->resync_max_sectors
;
3928 max_sectors
= mddev
->dev_sectors
;
3930 resync
= mddev
->curr_resync_completed
;
3931 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3934 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3937 min_sync_show(mddev_t
*mddev
, char *page
)
3939 return sprintf(page
, "%llu\n",
3940 (unsigned long long)mddev
->resync_min
);
3943 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3945 unsigned long long min
;
3946 if (strict_strtoull(buf
, 10, &min
))
3948 if (min
> mddev
->resync_max
)
3950 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3953 /* Must be a multiple of chunk_size */
3954 if (mddev
->chunk_sectors
) {
3955 sector_t temp
= min
;
3956 if (sector_div(temp
, mddev
->chunk_sectors
))
3959 mddev
->resync_min
= min
;
3964 static struct md_sysfs_entry md_min_sync
=
3965 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3968 max_sync_show(mddev_t
*mddev
, char *page
)
3970 if (mddev
->resync_max
== MaxSector
)
3971 return sprintf(page
, "max\n");
3973 return sprintf(page
, "%llu\n",
3974 (unsigned long long)mddev
->resync_max
);
3977 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3979 if (strncmp(buf
, "max", 3) == 0)
3980 mddev
->resync_max
= MaxSector
;
3982 unsigned long long max
;
3983 if (strict_strtoull(buf
, 10, &max
))
3985 if (max
< mddev
->resync_min
)
3987 if (max
< mddev
->resync_max
&&
3989 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3992 /* Must be a multiple of chunk_size */
3993 if (mddev
->chunk_sectors
) {
3994 sector_t temp
= max
;
3995 if (sector_div(temp
, mddev
->chunk_sectors
))
3998 mddev
->resync_max
= max
;
4000 wake_up(&mddev
->recovery_wait
);
4004 static struct md_sysfs_entry md_max_sync
=
4005 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4008 suspend_lo_show(mddev_t
*mddev
, char *page
)
4010 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4014 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4017 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4019 if (mddev
->pers
== NULL
||
4020 mddev
->pers
->quiesce
== NULL
)
4022 if (buf
== e
|| (*e
&& *e
!= '\n'))
4024 if (new >= mddev
->suspend_hi
||
4025 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
4026 mddev
->suspend_lo
= new;
4027 mddev
->pers
->quiesce(mddev
, 2);
4032 static struct md_sysfs_entry md_suspend_lo
=
4033 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4037 suspend_hi_show(mddev_t
*mddev
, char *page
)
4039 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4043 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4046 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4048 if (mddev
->pers
== NULL
||
4049 mddev
->pers
->quiesce
== NULL
)
4051 if (buf
== e
|| (*e
&& *e
!= '\n'))
4053 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
4054 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
4055 mddev
->suspend_hi
= new;
4056 mddev
->pers
->quiesce(mddev
, 1);
4057 mddev
->pers
->quiesce(mddev
, 0);
4062 static struct md_sysfs_entry md_suspend_hi
=
4063 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4066 reshape_position_show(mddev_t
*mddev
, char *page
)
4068 if (mddev
->reshape_position
!= MaxSector
)
4069 return sprintf(page
, "%llu\n",
4070 (unsigned long long)mddev
->reshape_position
);
4071 strcpy(page
, "none\n");
4076 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4079 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4082 if (buf
== e
|| (*e
&& *e
!= '\n'))
4084 mddev
->reshape_position
= new;
4085 mddev
->delta_disks
= 0;
4086 mddev
->new_level
= mddev
->level
;
4087 mddev
->new_layout
= mddev
->layout
;
4088 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4092 static struct md_sysfs_entry md_reshape_position
=
4093 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4094 reshape_position_store
);
4097 array_size_show(mddev_t
*mddev
, char *page
)
4099 if (mddev
->external_size
)
4100 return sprintf(page
, "%llu\n",
4101 (unsigned long long)mddev
->array_sectors
/2);
4103 return sprintf(page
, "default\n");
4107 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4111 if (strncmp(buf
, "default", 7) == 0) {
4113 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4115 sectors
= mddev
->array_sectors
;
4117 mddev
->external_size
= 0;
4119 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4121 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4124 mddev
->external_size
= 1;
4127 mddev
->array_sectors
= sectors
;
4128 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4130 revalidate_disk(mddev
->gendisk
);
4135 static struct md_sysfs_entry md_array_size
=
4136 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4139 static struct attribute
*md_default_attrs
[] = {
4142 &md_raid_disks
.attr
,
4143 &md_chunk_size
.attr
,
4145 &md_resync_start
.attr
,
4147 &md_new_device
.attr
,
4148 &md_safe_delay
.attr
,
4149 &md_array_state
.attr
,
4150 &md_reshape_position
.attr
,
4151 &md_array_size
.attr
,
4152 &max_corr_read_errors
.attr
,
4156 static struct attribute
*md_redundancy_attrs
[] = {
4158 &md_mismatches
.attr
,
4161 &md_sync_speed
.attr
,
4162 &md_sync_force_parallel
.attr
,
4163 &md_sync_completed
.attr
,
4166 &md_suspend_lo
.attr
,
4167 &md_suspend_hi
.attr
,
4172 static struct attribute_group md_redundancy_group
= {
4174 .attrs
= md_redundancy_attrs
,
4179 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4181 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4182 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4187 rv
= mddev_lock(mddev
);
4189 rv
= entry
->show(mddev
, page
);
4190 mddev_unlock(mddev
);
4196 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4197 const char *page
, size_t length
)
4199 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4200 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4205 if (!capable(CAP_SYS_ADMIN
))
4207 rv
= mddev_lock(mddev
);
4208 if (mddev
->hold_active
== UNTIL_IOCTL
)
4209 mddev
->hold_active
= 0;
4211 rv
= entry
->store(mddev
, page
, length
);
4212 mddev_unlock(mddev
);
4217 static void md_free(struct kobject
*ko
)
4219 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4221 if (mddev
->sysfs_state
)
4222 sysfs_put(mddev
->sysfs_state
);
4224 if (mddev
->gendisk
) {
4225 del_gendisk(mddev
->gendisk
);
4226 put_disk(mddev
->gendisk
);
4229 blk_cleanup_queue(mddev
->queue
);
4234 static const struct sysfs_ops md_sysfs_ops
= {
4235 .show
= md_attr_show
,
4236 .store
= md_attr_store
,
4238 static struct kobj_type md_ktype
= {
4240 .sysfs_ops
= &md_sysfs_ops
,
4241 .default_attrs
= md_default_attrs
,
4246 static void mddev_delayed_delete(struct work_struct
*ws
)
4248 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4250 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4251 kobject_del(&mddev
->kobj
);
4252 kobject_put(&mddev
->kobj
);
4255 static int md_alloc(dev_t dev
, char *name
)
4257 static DEFINE_MUTEX(disks_mutex
);
4258 mddev_t
*mddev
= mddev_find(dev
);
4259 struct gendisk
*disk
;
4268 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4269 shift
= partitioned
? MdpMinorShift
: 0;
4270 unit
= MINOR(mddev
->unit
) >> shift
;
4272 /* wait for any previous instance of this device to be
4273 * completely removed (mddev_delayed_delete).
4275 flush_workqueue(md_misc_wq
);
4277 mutex_lock(&disks_mutex
);
4283 /* Need to ensure that 'name' is not a duplicate.
4286 spin_lock(&all_mddevs_lock
);
4288 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4289 if (mddev2
->gendisk
&&
4290 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4291 spin_unlock(&all_mddevs_lock
);
4294 spin_unlock(&all_mddevs_lock
);
4298 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4301 mddev
->queue
->queuedata
= mddev
;
4303 blk_queue_make_request(mddev
->queue
, md_make_request
);
4305 disk
= alloc_disk(1 << shift
);
4307 blk_cleanup_queue(mddev
->queue
);
4308 mddev
->queue
= NULL
;
4311 disk
->major
= MAJOR(mddev
->unit
);
4312 disk
->first_minor
= unit
<< shift
;
4314 strcpy(disk
->disk_name
, name
);
4315 else if (partitioned
)
4316 sprintf(disk
->disk_name
, "md_d%d", unit
);
4318 sprintf(disk
->disk_name
, "md%d", unit
);
4319 disk
->fops
= &md_fops
;
4320 disk
->private_data
= mddev
;
4321 disk
->queue
= mddev
->queue
;
4322 /* Allow extended partitions. This makes the
4323 * 'mdp' device redundant, but we can't really
4326 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4328 mddev
->gendisk
= disk
;
4329 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4330 &disk_to_dev(disk
)->kobj
, "%s", "md");
4332 /* This isn't possible, but as kobject_init_and_add is marked
4333 * __must_check, we must do something with the result
4335 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4339 if (mddev
->kobj
.sd
&&
4340 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4341 printk(KERN_DEBUG
"pointless warning\n");
4343 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4345 mutex_unlock(&disks_mutex
);
4346 if (!error
&& mddev
->kobj
.sd
) {
4347 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4348 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4354 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4356 md_alloc(dev
, NULL
);
4360 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4362 /* val must be "md_*" where * is not all digits.
4363 * We allocate an array with a large free minor number, and
4364 * set the name to val. val must not already be an active name.
4366 int len
= strlen(val
);
4367 char buf
[DISK_NAME_LEN
];
4369 while (len
&& val
[len
-1] == '\n')
4371 if (len
>= DISK_NAME_LEN
)
4373 strlcpy(buf
, val
, len
+1);
4374 if (strncmp(buf
, "md_", 3) != 0)
4376 return md_alloc(0, buf
);
4379 static void md_safemode_timeout(unsigned long data
)
4381 mddev_t
*mddev
= (mddev_t
*) data
;
4383 if (!atomic_read(&mddev
->writes_pending
)) {
4384 mddev
->safemode
= 1;
4385 if (mddev
->external
)
4386 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4388 md_wakeup_thread(mddev
->thread
);
4391 static int start_dirty_degraded
;
4393 int md_run(mddev_t
*mddev
)
4397 struct mdk_personality
*pers
;
4399 if (list_empty(&mddev
->disks
))
4400 /* cannot run an array with no devices.. */
4405 /* Cannot run until previous stop completes properly */
4406 if (mddev
->sysfs_active
)
4410 * Analyze all RAID superblock(s)
4412 if (!mddev
->raid_disks
) {
4413 if (!mddev
->persistent
)
4418 if (mddev
->level
!= LEVEL_NONE
)
4419 request_module("md-level-%d", mddev
->level
);
4420 else if (mddev
->clevel
[0])
4421 request_module("md-%s", mddev
->clevel
);
4424 * Drop all container device buffers, from now on
4425 * the only valid external interface is through the md
4428 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4429 if (test_bit(Faulty
, &rdev
->flags
))
4431 sync_blockdev(rdev
->bdev
);
4432 invalidate_bdev(rdev
->bdev
);
4434 /* perform some consistency tests on the device.
4435 * We don't want the data to overlap the metadata,
4436 * Internal Bitmap issues have been handled elsewhere.
4438 if (rdev
->data_offset
< rdev
->sb_start
) {
4439 if (mddev
->dev_sectors
&&
4440 rdev
->data_offset
+ mddev
->dev_sectors
4442 printk("md: %s: data overlaps metadata\n",
4447 if (rdev
->sb_start
+ rdev
->sb_size
/512
4448 > rdev
->data_offset
) {
4449 printk("md: %s: metadata overlaps data\n",
4454 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4457 if (mddev
->bio_set
== NULL
)
4458 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, sizeof(mddev
));
4460 spin_lock(&pers_lock
);
4461 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4462 if (!pers
|| !try_module_get(pers
->owner
)) {
4463 spin_unlock(&pers_lock
);
4464 if (mddev
->level
!= LEVEL_NONE
)
4465 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4468 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4473 spin_unlock(&pers_lock
);
4474 if (mddev
->level
!= pers
->level
) {
4475 mddev
->level
= pers
->level
;
4476 mddev
->new_level
= pers
->level
;
4478 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4480 if (mddev
->reshape_position
!= MaxSector
&&
4481 pers
->start_reshape
== NULL
) {
4482 /* This personality cannot handle reshaping... */
4484 module_put(pers
->owner
);
4488 if (pers
->sync_request
) {
4489 /* Warn if this is a potentially silly
4492 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4496 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4497 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4499 rdev
->bdev
->bd_contains
==
4500 rdev2
->bdev
->bd_contains
) {
4502 "%s: WARNING: %s appears to be"
4503 " on the same physical disk as"
4506 bdevname(rdev
->bdev
,b
),
4507 bdevname(rdev2
->bdev
,b2
));
4514 "True protection against single-disk"
4515 " failure might be compromised.\n");
4518 mddev
->recovery
= 0;
4519 /* may be over-ridden by personality */
4520 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4522 mddev
->ok_start_degraded
= start_dirty_degraded
;
4524 if (start_readonly
&& mddev
->ro
== 0)
4525 mddev
->ro
= 2; /* read-only, but switch on first write */
4527 err
= mddev
->pers
->run(mddev
);
4529 printk(KERN_ERR
"md: pers->run() failed ...\n");
4530 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4531 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4532 " but 'external_size' not in effect?\n", __func__
);
4534 "md: invalid array_size %llu > default size %llu\n",
4535 (unsigned long long)mddev
->array_sectors
/ 2,
4536 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4538 mddev
->pers
->stop(mddev
);
4540 if (err
== 0 && mddev
->pers
->sync_request
) {
4541 err
= bitmap_create(mddev
);
4543 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4544 mdname(mddev
), err
);
4545 mddev
->pers
->stop(mddev
);
4549 module_put(mddev
->pers
->owner
);
4551 bitmap_destroy(mddev
);
4554 if (mddev
->pers
->sync_request
) {
4555 if (mddev
->kobj
.sd
&&
4556 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4558 "md: cannot register extra attributes for %s\n",
4560 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4561 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4564 atomic_set(&mddev
->writes_pending
,0);
4565 atomic_set(&mddev
->max_corr_read_errors
,
4566 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4567 mddev
->safemode
= 0;
4568 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4569 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4570 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4574 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4575 if (rdev
->raid_disk
>= 0) {
4577 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4578 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4579 /* failure here is OK */;
4582 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4585 md_update_sb(mddev
, 0);
4587 md_wakeup_thread(mddev
->thread
);
4588 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4590 md_new_event(mddev
);
4591 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4592 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4593 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4596 EXPORT_SYMBOL_GPL(md_run
);
4598 static int do_md_run(mddev_t
*mddev
)
4602 err
= md_run(mddev
);
4605 err
= bitmap_load(mddev
);
4607 bitmap_destroy(mddev
);
4610 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4611 revalidate_disk(mddev
->gendisk
);
4612 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4617 static int restart_array(mddev_t
*mddev
)
4619 struct gendisk
*disk
= mddev
->gendisk
;
4621 /* Complain if it has no devices */
4622 if (list_empty(&mddev
->disks
))
4628 mddev
->safemode
= 0;
4630 set_disk_ro(disk
, 0);
4631 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4633 /* Kick recovery or resync if necessary */
4634 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4635 md_wakeup_thread(mddev
->thread
);
4636 md_wakeup_thread(mddev
->sync_thread
);
4637 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4641 /* similar to deny_write_access, but accounts for our holding a reference
4642 * to the file ourselves */
4643 static int deny_bitmap_write_access(struct file
* file
)
4645 struct inode
*inode
= file
->f_mapping
->host
;
4647 spin_lock(&inode
->i_lock
);
4648 if (atomic_read(&inode
->i_writecount
) > 1) {
4649 spin_unlock(&inode
->i_lock
);
4652 atomic_set(&inode
->i_writecount
, -1);
4653 spin_unlock(&inode
->i_lock
);
4658 void restore_bitmap_write_access(struct file
*file
)
4660 struct inode
*inode
= file
->f_mapping
->host
;
4662 spin_lock(&inode
->i_lock
);
4663 atomic_set(&inode
->i_writecount
, 1);
4664 spin_unlock(&inode
->i_lock
);
4667 static void md_clean(mddev_t
*mddev
)
4669 mddev
->array_sectors
= 0;
4670 mddev
->external_size
= 0;
4671 mddev
->dev_sectors
= 0;
4672 mddev
->raid_disks
= 0;
4673 mddev
->recovery_cp
= 0;
4674 mddev
->resync_min
= 0;
4675 mddev
->resync_max
= MaxSector
;
4676 mddev
->reshape_position
= MaxSector
;
4677 mddev
->external
= 0;
4678 mddev
->persistent
= 0;
4679 mddev
->level
= LEVEL_NONE
;
4680 mddev
->clevel
[0] = 0;
4683 mddev
->metadata_type
[0] = 0;
4684 mddev
->chunk_sectors
= 0;
4685 mddev
->ctime
= mddev
->utime
= 0;
4687 mddev
->max_disks
= 0;
4689 mddev
->can_decrease_events
= 0;
4690 mddev
->delta_disks
= 0;
4691 mddev
->new_level
= LEVEL_NONE
;
4692 mddev
->new_layout
= 0;
4693 mddev
->new_chunk_sectors
= 0;
4694 mddev
->curr_resync
= 0;
4695 mddev
->resync_mismatches
= 0;
4696 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4697 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4698 mddev
->recovery
= 0;
4700 mddev
->degraded
= 0;
4701 mddev
->safemode
= 0;
4702 mddev
->bitmap_info
.offset
= 0;
4703 mddev
->bitmap_info
.default_offset
= 0;
4704 mddev
->bitmap_info
.chunksize
= 0;
4705 mddev
->bitmap_info
.daemon_sleep
= 0;
4706 mddev
->bitmap_info
.max_write_behind
= 0;
4710 static void __md_stop_writes(mddev_t
*mddev
)
4712 if (mddev
->sync_thread
) {
4713 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4714 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4715 reap_sync_thread(mddev
);
4718 del_timer_sync(&mddev
->safemode_timer
);
4720 bitmap_flush(mddev
);
4721 md_super_wait(mddev
);
4723 if (!mddev
->in_sync
|| mddev
->flags
) {
4724 /* mark array as shutdown cleanly */
4726 md_update_sb(mddev
, 1);
4730 void md_stop_writes(mddev_t
*mddev
)
4733 __md_stop_writes(mddev
);
4734 mddev_unlock(mddev
);
4736 EXPORT_SYMBOL_GPL(md_stop_writes
);
4738 void md_stop(mddev_t
*mddev
)
4741 mddev
->pers
->stop(mddev
);
4742 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4743 mddev
->to_remove
= &md_redundancy_group
;
4744 module_put(mddev
->pers
->owner
);
4746 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4748 EXPORT_SYMBOL_GPL(md_stop
);
4750 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4753 mutex_lock(&mddev
->open_mutex
);
4754 if (atomic_read(&mddev
->openers
) > is_open
) {
4755 printk("md: %s still in use.\n",mdname(mddev
));
4760 __md_stop_writes(mddev
);
4766 set_disk_ro(mddev
->gendisk
, 1);
4767 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4768 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4772 mutex_unlock(&mddev
->open_mutex
);
4777 * 0 - completely stop and dis-assemble array
4778 * 2 - stop but do not disassemble array
4780 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4782 struct gendisk
*disk
= mddev
->gendisk
;
4785 mutex_lock(&mddev
->open_mutex
);
4786 if (atomic_read(&mddev
->openers
) > is_open
||
4787 mddev
->sysfs_active
) {
4788 printk("md: %s still in use.\n",mdname(mddev
));
4789 mutex_unlock(&mddev
->open_mutex
);
4795 set_disk_ro(disk
, 0);
4797 __md_stop_writes(mddev
);
4799 mddev
->queue
->merge_bvec_fn
= NULL
;
4800 mddev
->queue
->unplug_fn
= NULL
;
4801 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4803 /* tell userspace to handle 'inactive' */
4804 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4806 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4807 if (rdev
->raid_disk
>= 0) {
4809 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4810 sysfs_remove_link(&mddev
->kobj
, nm
);
4813 set_capacity(disk
, 0);
4814 mutex_unlock(&mddev
->open_mutex
);
4815 revalidate_disk(disk
);
4820 mutex_unlock(&mddev
->open_mutex
);
4822 * Free resources if final stop
4825 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4827 bitmap_destroy(mddev
);
4828 if (mddev
->bitmap_info
.file
) {
4829 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4830 fput(mddev
->bitmap_info
.file
);
4831 mddev
->bitmap_info
.file
= NULL
;
4833 mddev
->bitmap_info
.offset
= 0;
4835 export_array(mddev
);
4838 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4839 if (mddev
->hold_active
== UNTIL_STOP
)
4840 mddev
->hold_active
= 0;
4842 blk_integrity_unregister(disk
);
4843 md_new_event(mddev
);
4844 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4849 static void autorun_array(mddev_t
*mddev
)
4854 if (list_empty(&mddev
->disks
))
4857 printk(KERN_INFO
"md: running: ");
4859 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4860 char b
[BDEVNAME_SIZE
];
4861 printk("<%s>", bdevname(rdev
->bdev
,b
));
4865 err
= do_md_run(mddev
);
4867 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4868 do_md_stop(mddev
, 0, 0);
4873 * lets try to run arrays based on all disks that have arrived
4874 * until now. (those are in pending_raid_disks)
4876 * the method: pick the first pending disk, collect all disks with
4877 * the same UUID, remove all from the pending list and put them into
4878 * the 'same_array' list. Then order this list based on superblock
4879 * update time (freshest comes first), kick out 'old' disks and
4880 * compare superblocks. If everything's fine then run it.
4882 * If "unit" is allocated, then bump its reference count
4884 static void autorun_devices(int part
)
4886 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4888 char b
[BDEVNAME_SIZE
];
4890 printk(KERN_INFO
"md: autorun ...\n");
4891 while (!list_empty(&pending_raid_disks
)) {
4894 LIST_HEAD(candidates
);
4895 rdev0
= list_entry(pending_raid_disks
.next
,
4896 mdk_rdev_t
, same_set
);
4898 printk(KERN_INFO
"md: considering %s ...\n",
4899 bdevname(rdev0
->bdev
,b
));
4900 INIT_LIST_HEAD(&candidates
);
4901 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4902 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4903 printk(KERN_INFO
"md: adding %s ...\n",
4904 bdevname(rdev
->bdev
,b
));
4905 list_move(&rdev
->same_set
, &candidates
);
4908 * now we have a set of devices, with all of them having
4909 * mostly sane superblocks. It's time to allocate the
4913 dev
= MKDEV(mdp_major
,
4914 rdev0
->preferred_minor
<< MdpMinorShift
);
4915 unit
= MINOR(dev
) >> MdpMinorShift
;
4917 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4920 if (rdev0
->preferred_minor
!= unit
) {
4921 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4922 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4926 md_probe(dev
, NULL
, NULL
);
4927 mddev
= mddev_find(dev
);
4928 if (!mddev
|| !mddev
->gendisk
) {
4932 "md: cannot allocate memory for md drive.\n");
4935 if (mddev_lock(mddev
))
4936 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4938 else if (mddev
->raid_disks
|| mddev
->major_version
4939 || !list_empty(&mddev
->disks
)) {
4941 "md: %s already running, cannot run %s\n",
4942 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4943 mddev_unlock(mddev
);
4945 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4946 mddev
->persistent
= 1;
4947 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4948 list_del_init(&rdev
->same_set
);
4949 if (bind_rdev_to_array(rdev
, mddev
))
4952 autorun_array(mddev
);
4953 mddev_unlock(mddev
);
4955 /* on success, candidates will be empty, on error
4958 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4959 list_del_init(&rdev
->same_set
);
4964 printk(KERN_INFO
"md: ... autorun DONE.\n");
4966 #endif /* !MODULE */
4968 static int get_version(void __user
* arg
)
4972 ver
.major
= MD_MAJOR_VERSION
;
4973 ver
.minor
= MD_MINOR_VERSION
;
4974 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4976 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4982 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4984 mdu_array_info_t info
;
4985 int nr
,working
,insync
,failed
,spare
;
4988 nr
=working
=insync
=failed
=spare
=0;
4989 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4991 if (test_bit(Faulty
, &rdev
->flags
))
4995 if (test_bit(In_sync
, &rdev
->flags
))
5002 info
.major_version
= mddev
->major_version
;
5003 info
.minor_version
= mddev
->minor_version
;
5004 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5005 info
.ctime
= mddev
->ctime
;
5006 info
.level
= mddev
->level
;
5007 info
.size
= mddev
->dev_sectors
/ 2;
5008 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5011 info
.raid_disks
= mddev
->raid_disks
;
5012 info
.md_minor
= mddev
->md_minor
;
5013 info
.not_persistent
= !mddev
->persistent
;
5015 info
.utime
= mddev
->utime
;
5018 info
.state
= (1<<MD_SB_CLEAN
);
5019 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5020 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5021 info
.active_disks
= insync
;
5022 info
.working_disks
= working
;
5023 info
.failed_disks
= failed
;
5024 info
.spare_disks
= spare
;
5026 info
.layout
= mddev
->layout
;
5027 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5029 if (copy_to_user(arg
, &info
, sizeof(info
)))
5035 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
5037 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5038 char *ptr
, *buf
= NULL
;
5041 if (md_allow_write(mddev
))
5042 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5044 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5049 /* bitmap disabled, zero the first byte and copy out */
5050 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5051 file
->pathname
[0] = '\0';
5055 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5059 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5063 strcpy(file
->pathname
, ptr
);
5067 if (copy_to_user(arg
, file
, sizeof(*file
)))
5075 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5077 mdu_disk_info_t info
;
5080 if (copy_from_user(&info
, arg
, sizeof(info
)))
5083 rdev
= find_rdev_nr(mddev
, info
.number
);
5085 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5086 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5087 info
.raid_disk
= rdev
->raid_disk
;
5089 if (test_bit(Faulty
, &rdev
->flags
))
5090 info
.state
|= (1<<MD_DISK_FAULTY
);
5091 else if (test_bit(In_sync
, &rdev
->flags
)) {
5092 info
.state
|= (1<<MD_DISK_ACTIVE
);
5093 info
.state
|= (1<<MD_DISK_SYNC
);
5095 if (test_bit(WriteMostly
, &rdev
->flags
))
5096 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5098 info
.major
= info
.minor
= 0;
5099 info
.raid_disk
= -1;
5100 info
.state
= (1<<MD_DISK_REMOVED
);
5103 if (copy_to_user(arg
, &info
, sizeof(info
)))
5109 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5111 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5113 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5115 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5118 if (!mddev
->raid_disks
) {
5120 /* expecting a device which has a superblock */
5121 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5124 "md: md_import_device returned %ld\n",
5126 return PTR_ERR(rdev
);
5128 if (!list_empty(&mddev
->disks
)) {
5129 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5130 mdk_rdev_t
, same_set
);
5131 err
= super_types
[mddev
->major_version
]
5132 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5135 "md: %s has different UUID to %s\n",
5136 bdevname(rdev
->bdev
,b
),
5137 bdevname(rdev0
->bdev
,b2
));
5142 err
= bind_rdev_to_array(rdev
, mddev
);
5149 * add_new_disk can be used once the array is assembled
5150 * to add "hot spares". They must already have a superblock
5155 if (!mddev
->pers
->hot_add_disk
) {
5157 "%s: personality does not support diskops!\n",
5161 if (mddev
->persistent
)
5162 rdev
= md_import_device(dev
, mddev
->major_version
,
5163 mddev
->minor_version
);
5165 rdev
= md_import_device(dev
, -1, -1);
5168 "md: md_import_device returned %ld\n",
5170 return PTR_ERR(rdev
);
5172 /* set saved_raid_disk if appropriate */
5173 if (!mddev
->persistent
) {
5174 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5175 info
->raid_disk
< mddev
->raid_disks
) {
5176 rdev
->raid_disk
= info
->raid_disk
;
5177 set_bit(In_sync
, &rdev
->flags
);
5179 rdev
->raid_disk
= -1;
5181 super_types
[mddev
->major_version
].
5182 validate_super(mddev
, rdev
);
5183 if (test_bit(In_sync
, &rdev
->flags
))
5184 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5186 rdev
->saved_raid_disk
= -1;
5188 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5189 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5190 set_bit(WriteMostly
, &rdev
->flags
);
5192 clear_bit(WriteMostly
, &rdev
->flags
);
5194 rdev
->raid_disk
= -1;
5195 err
= bind_rdev_to_array(rdev
, mddev
);
5196 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5197 /* If there is hot_add_disk but no hot_remove_disk
5198 * then added disks for geometry changes,
5199 * and should be added immediately.
5201 super_types
[mddev
->major_version
].
5202 validate_super(mddev
, rdev
);
5203 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5205 unbind_rdev_from_array(rdev
);
5210 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5212 md_update_sb(mddev
, 1);
5213 if (mddev
->degraded
)
5214 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5215 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5216 md_wakeup_thread(mddev
->thread
);
5220 /* otherwise, add_new_disk is only allowed
5221 * for major_version==0 superblocks
5223 if (mddev
->major_version
!= 0) {
5224 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5229 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5231 rdev
= md_import_device(dev
, -1, 0);
5234 "md: error, md_import_device() returned %ld\n",
5236 return PTR_ERR(rdev
);
5238 rdev
->desc_nr
= info
->number
;
5239 if (info
->raid_disk
< mddev
->raid_disks
)
5240 rdev
->raid_disk
= info
->raid_disk
;
5242 rdev
->raid_disk
= -1;
5244 if (rdev
->raid_disk
< mddev
->raid_disks
)
5245 if (info
->state
& (1<<MD_DISK_SYNC
))
5246 set_bit(In_sync
, &rdev
->flags
);
5248 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5249 set_bit(WriteMostly
, &rdev
->flags
);
5251 if (!mddev
->persistent
) {
5252 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5253 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5255 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5256 rdev
->sectors
= rdev
->sb_start
;
5258 err
= bind_rdev_to_array(rdev
, mddev
);
5268 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5270 char b
[BDEVNAME_SIZE
];
5273 rdev
= find_rdev(mddev
, dev
);
5277 if (rdev
->raid_disk
>= 0)
5280 kick_rdev_from_array(rdev
);
5281 md_update_sb(mddev
, 1);
5282 md_new_event(mddev
);
5286 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5287 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5291 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5293 char b
[BDEVNAME_SIZE
];
5300 if (mddev
->major_version
!= 0) {
5301 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5302 " version-0 superblocks.\n",
5306 if (!mddev
->pers
->hot_add_disk
) {
5308 "%s: personality does not support diskops!\n",
5313 rdev
= md_import_device(dev
, -1, 0);
5316 "md: error, md_import_device() returned %ld\n",
5321 if (mddev
->persistent
)
5322 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5324 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5326 rdev
->sectors
= rdev
->sb_start
;
5328 if (test_bit(Faulty
, &rdev
->flags
)) {
5330 "md: can not hot-add faulty %s disk to %s!\n",
5331 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5335 clear_bit(In_sync
, &rdev
->flags
);
5337 rdev
->saved_raid_disk
= -1;
5338 err
= bind_rdev_to_array(rdev
, mddev
);
5343 * The rest should better be atomic, we can have disk failures
5344 * noticed in interrupt contexts ...
5347 rdev
->raid_disk
= -1;
5349 md_update_sb(mddev
, 1);
5352 * Kick recovery, maybe this spare has to be added to the
5353 * array immediately.
5355 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5356 md_wakeup_thread(mddev
->thread
);
5357 md_new_event(mddev
);
5365 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5370 if (!mddev
->pers
->quiesce
)
5372 if (mddev
->recovery
|| mddev
->sync_thread
)
5374 /* we should be able to change the bitmap.. */
5380 return -EEXIST
; /* cannot add when bitmap is present */
5381 mddev
->bitmap_info
.file
= fget(fd
);
5383 if (mddev
->bitmap_info
.file
== NULL
) {
5384 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5389 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5391 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5393 fput(mddev
->bitmap_info
.file
);
5394 mddev
->bitmap_info
.file
= NULL
;
5397 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5398 } else if (mddev
->bitmap
== NULL
)
5399 return -ENOENT
; /* cannot remove what isn't there */
5402 mddev
->pers
->quiesce(mddev
, 1);
5404 err
= bitmap_create(mddev
);
5406 err
= bitmap_load(mddev
);
5408 if (fd
< 0 || err
) {
5409 bitmap_destroy(mddev
);
5410 fd
= -1; /* make sure to put the file */
5412 mddev
->pers
->quiesce(mddev
, 0);
5415 if (mddev
->bitmap_info
.file
) {
5416 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5417 fput(mddev
->bitmap_info
.file
);
5419 mddev
->bitmap_info
.file
= NULL
;
5426 * set_array_info is used two different ways
5427 * The original usage is when creating a new array.
5428 * In this usage, raid_disks is > 0 and it together with
5429 * level, size, not_persistent,layout,chunksize determine the
5430 * shape of the array.
5431 * This will always create an array with a type-0.90.0 superblock.
5432 * The newer usage is when assembling an array.
5433 * In this case raid_disks will be 0, and the major_version field is
5434 * use to determine which style super-blocks are to be found on the devices.
5435 * The minor and patch _version numbers are also kept incase the
5436 * super_block handler wishes to interpret them.
5438 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5441 if (info
->raid_disks
== 0) {
5442 /* just setting version number for superblock loading */
5443 if (info
->major_version
< 0 ||
5444 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5445 super_types
[info
->major_version
].name
== NULL
) {
5446 /* maybe try to auto-load a module? */
5448 "md: superblock version %d not known\n",
5449 info
->major_version
);
5452 mddev
->major_version
= info
->major_version
;
5453 mddev
->minor_version
= info
->minor_version
;
5454 mddev
->patch_version
= info
->patch_version
;
5455 mddev
->persistent
= !info
->not_persistent
;
5456 /* ensure mddev_put doesn't delete this now that there
5457 * is some minimal configuration.
5459 mddev
->ctime
= get_seconds();
5462 mddev
->major_version
= MD_MAJOR_VERSION
;
5463 mddev
->minor_version
= MD_MINOR_VERSION
;
5464 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5465 mddev
->ctime
= get_seconds();
5467 mddev
->level
= info
->level
;
5468 mddev
->clevel
[0] = 0;
5469 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5470 mddev
->raid_disks
= info
->raid_disks
;
5471 /* don't set md_minor, it is determined by which /dev/md* was
5474 if (info
->state
& (1<<MD_SB_CLEAN
))
5475 mddev
->recovery_cp
= MaxSector
;
5477 mddev
->recovery_cp
= 0;
5478 mddev
->persistent
= ! info
->not_persistent
;
5479 mddev
->external
= 0;
5481 mddev
->layout
= info
->layout
;
5482 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5484 mddev
->max_disks
= MD_SB_DISKS
;
5486 if (mddev
->persistent
)
5488 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5490 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5491 mddev
->bitmap_info
.offset
= 0;
5493 mddev
->reshape_position
= MaxSector
;
5496 * Generate a 128 bit UUID
5498 get_random_bytes(mddev
->uuid
, 16);
5500 mddev
->new_level
= mddev
->level
;
5501 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5502 mddev
->new_layout
= mddev
->layout
;
5503 mddev
->delta_disks
= 0;
5508 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5510 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5512 if (mddev
->external_size
)
5515 mddev
->array_sectors
= array_sectors
;
5517 EXPORT_SYMBOL(md_set_array_sectors
);
5519 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5523 int fit
= (num_sectors
== 0);
5525 if (mddev
->pers
->resize
== NULL
)
5527 /* The "num_sectors" is the number of sectors of each device that
5528 * is used. This can only make sense for arrays with redundancy.
5529 * linear and raid0 always use whatever space is available. We can only
5530 * consider changing this number if no resync or reconstruction is
5531 * happening, and if the new size is acceptable. It must fit before the
5532 * sb_start or, if that is <data_offset, it must fit before the size
5533 * of each device. If num_sectors is zero, we find the largest size
5537 if (mddev
->sync_thread
)
5540 /* Sorry, cannot grow a bitmap yet, just remove it,
5544 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5545 sector_t avail
= rdev
->sectors
;
5547 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5548 num_sectors
= avail
;
5549 if (avail
< num_sectors
)
5552 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5554 revalidate_disk(mddev
->gendisk
);
5558 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5561 /* change the number of raid disks */
5562 if (mddev
->pers
->check_reshape
== NULL
)
5564 if (raid_disks
<= 0 ||
5565 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5567 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5569 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5571 rv
= mddev
->pers
->check_reshape(mddev
);
5577 * update_array_info is used to change the configuration of an
5579 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5580 * fields in the info are checked against the array.
5581 * Any differences that cannot be handled will cause an error.
5582 * Normally, only one change can be managed at a time.
5584 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5590 /* calculate expected state,ignoring low bits */
5591 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5592 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5594 if (mddev
->major_version
!= info
->major_version
||
5595 mddev
->minor_version
!= info
->minor_version
||
5596 /* mddev->patch_version != info->patch_version || */
5597 mddev
->ctime
!= info
->ctime
||
5598 mddev
->level
!= info
->level
||
5599 /* mddev->layout != info->layout || */
5600 !mddev
->persistent
!= info
->not_persistent
||
5601 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5602 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5603 ((state
^info
->state
) & 0xfffffe00)
5606 /* Check there is only one change */
5607 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5609 if (mddev
->raid_disks
!= info
->raid_disks
)
5611 if (mddev
->layout
!= info
->layout
)
5613 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5620 if (mddev
->layout
!= info
->layout
) {
5622 * we don't need to do anything at the md level, the
5623 * personality will take care of it all.
5625 if (mddev
->pers
->check_reshape
== NULL
)
5628 mddev
->new_layout
= info
->layout
;
5629 rv
= mddev
->pers
->check_reshape(mddev
);
5631 mddev
->new_layout
= mddev
->layout
;
5635 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5636 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5638 if (mddev
->raid_disks
!= info
->raid_disks
)
5639 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5641 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5642 if (mddev
->pers
->quiesce
== NULL
)
5644 if (mddev
->recovery
|| mddev
->sync_thread
)
5646 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5647 /* add the bitmap */
5650 if (mddev
->bitmap_info
.default_offset
== 0)
5652 mddev
->bitmap_info
.offset
=
5653 mddev
->bitmap_info
.default_offset
;
5654 mddev
->pers
->quiesce(mddev
, 1);
5655 rv
= bitmap_create(mddev
);
5657 rv
= bitmap_load(mddev
);
5659 bitmap_destroy(mddev
);
5660 mddev
->pers
->quiesce(mddev
, 0);
5662 /* remove the bitmap */
5665 if (mddev
->bitmap
->file
)
5667 mddev
->pers
->quiesce(mddev
, 1);
5668 bitmap_destroy(mddev
);
5669 mddev
->pers
->quiesce(mddev
, 0);
5670 mddev
->bitmap_info
.offset
= 0;
5673 md_update_sb(mddev
, 1);
5677 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5681 if (mddev
->pers
== NULL
)
5684 rdev
= find_rdev(mddev
, dev
);
5688 md_error(mddev
, rdev
);
5693 * We have a problem here : there is no easy way to give a CHS
5694 * virtual geometry. We currently pretend that we have a 2 heads
5695 * 4 sectors (with a BIG number of cylinders...). This drives
5696 * dosfs just mad... ;-)
5698 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5700 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5704 geo
->cylinders
= mddev
->array_sectors
/ 8;
5708 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5709 unsigned int cmd
, unsigned long arg
)
5712 void __user
*argp
= (void __user
*)arg
;
5713 mddev_t
*mddev
= NULL
;
5716 if (!capable(CAP_SYS_ADMIN
))
5720 * Commands dealing with the RAID driver but not any
5726 err
= get_version(argp
);
5729 case PRINT_RAID_DEBUG
:
5737 autostart_arrays(arg
);
5744 * Commands creating/starting a new array:
5747 mddev
= bdev
->bd_disk
->private_data
;
5754 err
= mddev_lock(mddev
);
5757 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5764 case SET_ARRAY_INFO
:
5766 mdu_array_info_t info
;
5768 memset(&info
, 0, sizeof(info
));
5769 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5774 err
= update_array_info(mddev
, &info
);
5776 printk(KERN_WARNING
"md: couldn't update"
5777 " array info. %d\n", err
);
5782 if (!list_empty(&mddev
->disks
)) {
5784 "md: array %s already has disks!\n",
5789 if (mddev
->raid_disks
) {
5791 "md: array %s already initialised!\n",
5796 err
= set_array_info(mddev
, &info
);
5798 printk(KERN_WARNING
"md: couldn't set"
5799 " array info. %d\n", err
);
5809 * Commands querying/configuring an existing array:
5811 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5812 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5813 if ((!mddev
->raid_disks
&& !mddev
->external
)
5814 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5815 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5816 && cmd
!= GET_BITMAP_FILE
) {
5822 * Commands even a read-only array can execute:
5826 case GET_ARRAY_INFO
:
5827 err
= get_array_info(mddev
, argp
);
5830 case GET_BITMAP_FILE
:
5831 err
= get_bitmap_file(mddev
, argp
);
5835 err
= get_disk_info(mddev
, argp
);
5838 case RESTART_ARRAY_RW
:
5839 err
= restart_array(mddev
);
5843 err
= do_md_stop(mddev
, 0, 1);
5847 err
= md_set_readonly(mddev
, 1);
5851 if (get_user(ro
, (int __user
*)(arg
))) {
5857 /* if the bdev is going readonly the value of mddev->ro
5858 * does not matter, no writes are coming
5863 /* are we are already prepared for writes? */
5867 /* transitioning to readauto need only happen for
5868 * arrays that call md_write_start
5871 err
= restart_array(mddev
);
5874 set_disk_ro(mddev
->gendisk
, 0);
5881 * The remaining ioctls are changing the state of the
5882 * superblock, so we do not allow them on read-only arrays.
5883 * However non-MD ioctls (e.g. get-size) will still come through
5884 * here and hit the 'default' below, so only disallow
5885 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5887 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5888 if (mddev
->ro
== 2) {
5890 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5891 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5892 md_wakeup_thread(mddev
->thread
);
5903 mdu_disk_info_t info
;
5904 if (copy_from_user(&info
, argp
, sizeof(info
)))
5907 err
= add_new_disk(mddev
, &info
);
5911 case HOT_REMOVE_DISK
:
5912 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5916 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5919 case SET_DISK_FAULTY
:
5920 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5924 err
= do_md_run(mddev
);
5927 case SET_BITMAP_FILE
:
5928 err
= set_bitmap_file(mddev
, (int)arg
);
5938 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5940 mddev
->hold_active
= 0;
5941 mddev_unlock(mddev
);
5950 #ifdef CONFIG_COMPAT
5951 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5952 unsigned int cmd
, unsigned long arg
)
5955 case HOT_REMOVE_DISK
:
5957 case SET_DISK_FAULTY
:
5958 case SET_BITMAP_FILE
:
5959 /* These take in integer arg, do not convert */
5962 arg
= (unsigned long)compat_ptr(arg
);
5966 return md_ioctl(bdev
, mode
, cmd
, arg
);
5968 #endif /* CONFIG_COMPAT */
5970 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5973 * Succeed if we can lock the mddev, which confirms that
5974 * it isn't being stopped right now.
5976 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5979 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5980 /* we are racing with mddev_put which is discarding this
5984 /* Wait until bdev->bd_disk is definitely gone */
5985 flush_workqueue(md_misc_wq
);
5986 /* Then retry the open from the top */
5987 return -ERESTARTSYS
;
5989 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5991 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5995 atomic_inc(&mddev
->openers
);
5996 mutex_unlock(&mddev
->open_mutex
);
5998 check_disk_size_change(mddev
->gendisk
, bdev
);
6003 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6005 mddev_t
*mddev
= disk
->private_data
;
6008 atomic_dec(&mddev
->openers
);
6013 static const struct block_device_operations md_fops
=
6015 .owner
= THIS_MODULE
,
6017 .release
= md_release
,
6019 #ifdef CONFIG_COMPAT
6020 .compat_ioctl
= md_compat_ioctl
,
6022 .getgeo
= md_getgeo
,
6025 static int md_thread(void * arg
)
6027 mdk_thread_t
*thread
= arg
;
6030 * md_thread is a 'system-thread', it's priority should be very
6031 * high. We avoid resource deadlocks individually in each
6032 * raid personality. (RAID5 does preallocation) We also use RR and
6033 * the very same RT priority as kswapd, thus we will never get
6034 * into a priority inversion deadlock.
6036 * we definitely have to have equal or higher priority than
6037 * bdflush, otherwise bdflush will deadlock if there are too
6038 * many dirty RAID5 blocks.
6041 allow_signal(SIGKILL
);
6042 while (!kthread_should_stop()) {
6044 /* We need to wait INTERRUPTIBLE so that
6045 * we don't add to the load-average.
6046 * That means we need to be sure no signals are
6049 if (signal_pending(current
))
6050 flush_signals(current
);
6052 wait_event_interruptible_timeout
6054 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6055 || kthread_should_stop(),
6058 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6059 if (!kthread_should_stop())
6060 thread
->run(thread
->mddev
);
6066 void md_wakeup_thread(mdk_thread_t
*thread
)
6069 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6070 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6071 wake_up(&thread
->wqueue
);
6075 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6078 mdk_thread_t
*thread
;
6080 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6084 init_waitqueue_head(&thread
->wqueue
);
6087 thread
->mddev
= mddev
;
6088 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6089 thread
->tsk
= kthread_run(md_thread
, thread
,
6091 mdname(thread
->mddev
),
6092 name
?: mddev
->pers
->name
);
6093 if (IS_ERR(thread
->tsk
)) {
6100 void md_unregister_thread(mdk_thread_t
*thread
)
6104 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6106 kthread_stop(thread
->tsk
);
6110 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6117 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6120 if (mddev
->external
)
6121 set_bit(Blocked
, &rdev
->flags
);
6123 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6125 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6126 __builtin_return_address(0),__builtin_return_address(1),
6127 __builtin_return_address(2),__builtin_return_address(3));
6131 if (!mddev
->pers
->error_handler
)
6133 mddev
->pers
->error_handler(mddev
,rdev
);
6134 if (mddev
->degraded
)
6135 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6136 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6137 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6138 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6139 md_wakeup_thread(mddev
->thread
);
6140 if (mddev
->event_work
.func
)
6141 queue_work(md_misc_wq
, &mddev
->event_work
);
6142 md_new_event_inintr(mddev
);
6145 /* seq_file implementation /proc/mdstat */
6147 static void status_unused(struct seq_file
*seq
)
6152 seq_printf(seq
, "unused devices: ");
6154 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6155 char b
[BDEVNAME_SIZE
];
6157 seq_printf(seq
, "%s ",
6158 bdevname(rdev
->bdev
,b
));
6161 seq_printf(seq
, "<none>");
6163 seq_printf(seq
, "\n");
6167 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6169 sector_t max_sectors
, resync
, res
;
6170 unsigned long dt
, db
;
6173 unsigned int per_milli
;
6175 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6177 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6178 max_sectors
= mddev
->resync_max_sectors
;
6180 max_sectors
= mddev
->dev_sectors
;
6183 * Should not happen.
6189 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6190 * in a sector_t, and (max_sectors>>scale) will fit in a
6191 * u32, as those are the requirements for sector_div.
6192 * Thus 'scale' must be at least 10
6195 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6196 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6199 res
= (resync
>>scale
)*1000;
6200 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6204 int i
, x
= per_milli
/50, y
= 20-x
;
6205 seq_printf(seq
, "[");
6206 for (i
= 0; i
< x
; i
++)
6207 seq_printf(seq
, "=");
6208 seq_printf(seq
, ">");
6209 for (i
= 0; i
< y
; i
++)
6210 seq_printf(seq
, ".");
6211 seq_printf(seq
, "] ");
6213 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6214 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6216 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6218 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6219 "resync" : "recovery"))),
6220 per_milli
/10, per_milli
% 10,
6221 (unsigned long long) resync
/2,
6222 (unsigned long long) max_sectors
/2);
6225 * dt: time from mark until now
6226 * db: blocks written from mark until now
6227 * rt: remaining time
6229 * rt is a sector_t, so could be 32bit or 64bit.
6230 * So we divide before multiply in case it is 32bit and close
6232 * We scale the divisor (db) by 32 to avoid loosing precision
6233 * near the end of resync when the number of remaining sectors
6235 * We then divide rt by 32 after multiplying by db to compensate.
6236 * The '+1' avoids division by zero if db is very small.
6238 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6240 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6241 - mddev
->resync_mark_cnt
;
6243 rt
= max_sectors
- resync
; /* number of remaining sectors */
6244 sector_div(rt
, db
/32+1);
6248 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6249 ((unsigned long)rt
% 60)/6);
6251 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6254 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6256 struct list_head
*tmp
;
6266 spin_lock(&all_mddevs_lock
);
6267 list_for_each(tmp
,&all_mddevs
)
6269 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6271 spin_unlock(&all_mddevs_lock
);
6274 spin_unlock(&all_mddevs_lock
);
6276 return (void*)2;/* tail */
6280 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6282 struct list_head
*tmp
;
6283 mddev_t
*next_mddev
, *mddev
= v
;
6289 spin_lock(&all_mddevs_lock
);
6291 tmp
= all_mddevs
.next
;
6293 tmp
= mddev
->all_mddevs
.next
;
6294 if (tmp
!= &all_mddevs
)
6295 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6297 next_mddev
= (void*)2;
6300 spin_unlock(&all_mddevs_lock
);
6308 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6312 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6316 struct mdstat_info
{
6320 static int md_seq_show(struct seq_file
*seq
, void *v
)
6325 struct mdstat_info
*mi
= seq
->private;
6326 struct bitmap
*bitmap
;
6328 if (v
== (void*)1) {
6329 struct mdk_personality
*pers
;
6330 seq_printf(seq
, "Personalities : ");
6331 spin_lock(&pers_lock
);
6332 list_for_each_entry(pers
, &pers_list
, list
)
6333 seq_printf(seq
, "[%s] ", pers
->name
);
6335 spin_unlock(&pers_lock
);
6336 seq_printf(seq
, "\n");
6337 mi
->event
= atomic_read(&md_event_count
);
6340 if (v
== (void*)2) {
6345 if (mddev_lock(mddev
) < 0)
6348 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6349 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6350 mddev
->pers
? "" : "in");
6353 seq_printf(seq
, " (read-only)");
6355 seq_printf(seq
, " (auto-read-only)");
6356 seq_printf(seq
, " %s", mddev
->pers
->name
);
6360 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6361 char b
[BDEVNAME_SIZE
];
6362 seq_printf(seq
, " %s[%d]",
6363 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6364 if (test_bit(WriteMostly
, &rdev
->flags
))
6365 seq_printf(seq
, "(W)");
6366 if (test_bit(Faulty
, &rdev
->flags
)) {
6367 seq_printf(seq
, "(F)");
6369 } else if (rdev
->raid_disk
< 0)
6370 seq_printf(seq
, "(S)"); /* spare */
6371 sectors
+= rdev
->sectors
;
6374 if (!list_empty(&mddev
->disks
)) {
6376 seq_printf(seq
, "\n %llu blocks",
6377 (unsigned long long)
6378 mddev
->array_sectors
/ 2);
6380 seq_printf(seq
, "\n %llu blocks",
6381 (unsigned long long)sectors
/ 2);
6383 if (mddev
->persistent
) {
6384 if (mddev
->major_version
!= 0 ||
6385 mddev
->minor_version
!= 90) {
6386 seq_printf(seq
," super %d.%d",
6387 mddev
->major_version
,
6388 mddev
->minor_version
);
6390 } else if (mddev
->external
)
6391 seq_printf(seq
, " super external:%s",
6392 mddev
->metadata_type
);
6394 seq_printf(seq
, " super non-persistent");
6397 mddev
->pers
->status(seq
, mddev
);
6398 seq_printf(seq
, "\n ");
6399 if (mddev
->pers
->sync_request
) {
6400 if (mddev
->curr_resync
> 2) {
6401 status_resync(seq
, mddev
);
6402 seq_printf(seq
, "\n ");
6403 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6404 seq_printf(seq
, "\tresync=DELAYED\n ");
6405 else if (mddev
->recovery_cp
< MaxSector
)
6406 seq_printf(seq
, "\tresync=PENDING\n ");
6409 seq_printf(seq
, "\n ");
6411 if ((bitmap
= mddev
->bitmap
)) {
6412 unsigned long chunk_kb
;
6413 unsigned long flags
;
6414 spin_lock_irqsave(&bitmap
->lock
, flags
);
6415 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6416 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6418 bitmap
->pages
- bitmap
->missing_pages
,
6420 (bitmap
->pages
- bitmap
->missing_pages
)
6421 << (PAGE_SHIFT
- 10),
6422 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6423 chunk_kb
? "KB" : "B");
6425 seq_printf(seq
, ", file: ");
6426 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6429 seq_printf(seq
, "\n");
6430 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6433 seq_printf(seq
, "\n");
6435 mddev_unlock(mddev
);
6440 static const struct seq_operations md_seq_ops
= {
6441 .start
= md_seq_start
,
6442 .next
= md_seq_next
,
6443 .stop
= md_seq_stop
,
6444 .show
= md_seq_show
,
6447 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6450 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6454 error
= seq_open(file
, &md_seq_ops
);
6458 struct seq_file
*p
= file
->private_data
;
6460 mi
->event
= atomic_read(&md_event_count
);
6465 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6467 struct seq_file
*m
= filp
->private_data
;
6468 struct mdstat_info
*mi
= m
->private;
6471 poll_wait(filp
, &md_event_waiters
, wait
);
6473 /* always allow read */
6474 mask
= POLLIN
| POLLRDNORM
;
6476 if (mi
->event
!= atomic_read(&md_event_count
))
6477 mask
|= POLLERR
| POLLPRI
;
6481 static const struct file_operations md_seq_fops
= {
6482 .owner
= THIS_MODULE
,
6483 .open
= md_seq_open
,
6485 .llseek
= seq_lseek
,
6486 .release
= seq_release_private
,
6487 .poll
= mdstat_poll
,
6490 int register_md_personality(struct mdk_personality
*p
)
6492 spin_lock(&pers_lock
);
6493 list_add_tail(&p
->list
, &pers_list
);
6494 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6495 spin_unlock(&pers_lock
);
6499 int unregister_md_personality(struct mdk_personality
*p
)
6501 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6502 spin_lock(&pers_lock
);
6503 list_del_init(&p
->list
);
6504 spin_unlock(&pers_lock
);
6508 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6516 rdev_for_each_rcu(rdev
, mddev
) {
6517 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6518 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6519 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6520 atomic_read(&disk
->sync_io
);
6521 /* sync IO will cause sync_io to increase before the disk_stats
6522 * as sync_io is counted when a request starts, and
6523 * disk_stats is counted when it completes.
6524 * So resync activity will cause curr_events to be smaller than
6525 * when there was no such activity.
6526 * non-sync IO will cause disk_stat to increase without
6527 * increasing sync_io so curr_events will (eventually)
6528 * be larger than it was before. Once it becomes
6529 * substantially larger, the test below will cause
6530 * the array to appear non-idle, and resync will slow
6532 * If there is a lot of outstanding resync activity when
6533 * we set last_event to curr_events, then all that activity
6534 * completing might cause the array to appear non-idle
6535 * and resync will be slowed down even though there might
6536 * not have been non-resync activity. This will only
6537 * happen once though. 'last_events' will soon reflect
6538 * the state where there is little or no outstanding
6539 * resync requests, and further resync activity will
6540 * always make curr_events less than last_events.
6543 if (init
|| curr_events
- rdev
->last_events
> 64) {
6544 rdev
->last_events
= curr_events
;
6552 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6554 /* another "blocks" (512byte) blocks have been synced */
6555 atomic_sub(blocks
, &mddev
->recovery_active
);
6556 wake_up(&mddev
->recovery_wait
);
6558 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6559 md_wakeup_thread(mddev
->thread
);
6560 // stop recovery, signal do_sync ....
6565 /* md_write_start(mddev, bi)
6566 * If we need to update some array metadata (e.g. 'active' flag
6567 * in superblock) before writing, schedule a superblock update
6568 * and wait for it to complete.
6570 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6573 if (bio_data_dir(bi
) != WRITE
)
6576 BUG_ON(mddev
->ro
== 1);
6577 if (mddev
->ro
== 2) {
6578 /* need to switch to read/write */
6580 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6581 md_wakeup_thread(mddev
->thread
);
6582 md_wakeup_thread(mddev
->sync_thread
);
6585 atomic_inc(&mddev
->writes_pending
);
6586 if (mddev
->safemode
== 1)
6587 mddev
->safemode
= 0;
6588 if (mddev
->in_sync
) {
6589 spin_lock_irq(&mddev
->write_lock
);
6590 if (mddev
->in_sync
) {
6592 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6593 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6594 md_wakeup_thread(mddev
->thread
);
6597 spin_unlock_irq(&mddev
->write_lock
);
6600 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6601 wait_event(mddev
->sb_wait
,
6602 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6605 void md_write_end(mddev_t
*mddev
)
6607 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6608 if (mddev
->safemode
== 2)
6609 md_wakeup_thread(mddev
->thread
);
6610 else if (mddev
->safemode_delay
)
6611 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6615 /* md_allow_write(mddev)
6616 * Calling this ensures that the array is marked 'active' so that writes
6617 * may proceed without blocking. It is important to call this before
6618 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6619 * Must be called with mddev_lock held.
6621 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6622 * is dropped, so return -EAGAIN after notifying userspace.
6624 int md_allow_write(mddev_t
*mddev
)
6630 if (!mddev
->pers
->sync_request
)
6633 spin_lock_irq(&mddev
->write_lock
);
6634 if (mddev
->in_sync
) {
6636 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6637 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6638 if (mddev
->safemode_delay
&&
6639 mddev
->safemode
== 0)
6640 mddev
->safemode
= 1;
6641 spin_unlock_irq(&mddev
->write_lock
);
6642 md_update_sb(mddev
, 0);
6643 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6645 spin_unlock_irq(&mddev
->write_lock
);
6647 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6652 EXPORT_SYMBOL_GPL(md_allow_write
);
6654 void md_unplug(mddev_t
*mddev
)
6657 blk_unplug(mddev
->queue
);
6659 mddev
->plug
->unplug_fn(mddev
->plug
);
6662 #define SYNC_MARKS 10
6663 #define SYNC_MARK_STEP (3*HZ)
6664 void md_do_sync(mddev_t
*mddev
)
6667 unsigned int currspeed
= 0,
6669 sector_t max_sectors
,j
, io_sectors
;
6670 unsigned long mark
[SYNC_MARKS
];
6671 sector_t mark_cnt
[SYNC_MARKS
];
6673 struct list_head
*tmp
;
6674 sector_t last_check
;
6679 /* just incase thread restarts... */
6680 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6682 if (mddev
->ro
) /* never try to sync a read-only array */
6685 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6686 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6687 desc
= "data-check";
6688 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6689 desc
= "requested-resync";
6692 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6697 /* we overload curr_resync somewhat here.
6698 * 0 == not engaged in resync at all
6699 * 2 == checking that there is no conflict with another sync
6700 * 1 == like 2, but have yielded to allow conflicting resync to
6702 * other == active in resync - this many blocks
6704 * Before starting a resync we must have set curr_resync to
6705 * 2, and then checked that every "conflicting" array has curr_resync
6706 * less than ours. When we find one that is the same or higher
6707 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6708 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6709 * This will mean we have to start checking from the beginning again.
6714 mddev
->curr_resync
= 2;
6717 if (kthread_should_stop())
6718 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6720 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6722 for_each_mddev(mddev2
, tmp
) {
6723 if (mddev2
== mddev
)
6725 if (!mddev
->parallel_resync
6726 && mddev2
->curr_resync
6727 && match_mddev_units(mddev
, mddev2
)) {
6729 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6730 /* arbitrarily yield */
6731 mddev
->curr_resync
= 1;
6732 wake_up(&resync_wait
);
6734 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6735 /* no need to wait here, we can wait the next
6736 * time 'round when curr_resync == 2
6739 /* We need to wait 'interruptible' so as not to
6740 * contribute to the load average, and not to
6741 * be caught by 'softlockup'
6743 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6744 if (!kthread_should_stop() &&
6745 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6746 printk(KERN_INFO
"md: delaying %s of %s"
6747 " until %s has finished (they"
6748 " share one or more physical units)\n",
6749 desc
, mdname(mddev
), mdname(mddev2
));
6751 if (signal_pending(current
))
6752 flush_signals(current
);
6754 finish_wait(&resync_wait
, &wq
);
6757 finish_wait(&resync_wait
, &wq
);
6760 } while (mddev
->curr_resync
< 2);
6763 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6764 /* resync follows the size requested by the personality,
6765 * which defaults to physical size, but can be virtual size
6767 max_sectors
= mddev
->resync_max_sectors
;
6768 mddev
->resync_mismatches
= 0;
6769 /* we don't use the checkpoint if there's a bitmap */
6770 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6771 j
= mddev
->resync_min
;
6772 else if (!mddev
->bitmap
)
6773 j
= mddev
->recovery_cp
;
6775 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6776 max_sectors
= mddev
->dev_sectors
;
6778 /* recovery follows the physical size of devices */
6779 max_sectors
= mddev
->dev_sectors
;
6782 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6783 if (rdev
->raid_disk
>= 0 &&
6784 !test_bit(Faulty
, &rdev
->flags
) &&
6785 !test_bit(In_sync
, &rdev
->flags
) &&
6786 rdev
->recovery_offset
< j
)
6787 j
= rdev
->recovery_offset
;
6791 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6792 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6793 " %d KB/sec/disk.\n", speed_min(mddev
));
6794 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6795 "(but not more than %d KB/sec) for %s.\n",
6796 speed_max(mddev
), desc
);
6798 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6801 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6803 mark_cnt
[m
] = io_sectors
;
6806 mddev
->resync_mark
= mark
[last_mark
];
6807 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6810 * Tune reconstruction:
6812 window
= 32*(PAGE_SIZE
/512);
6813 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6814 window
/2,(unsigned long long) max_sectors
/2);
6816 atomic_set(&mddev
->recovery_active
, 0);
6821 "md: resuming %s of %s from checkpoint.\n",
6822 desc
, mdname(mddev
));
6823 mddev
->curr_resync
= j
;
6825 mddev
->curr_resync_completed
= mddev
->curr_resync
;
6827 while (j
< max_sectors
) {
6832 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6833 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6834 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6835 > (max_sectors
>> 4)) ||
6836 (j
- mddev
->curr_resync_completed
)*2
6837 >= mddev
->resync_max
- mddev
->curr_resync_completed
6839 /* time to update curr_resync_completed */
6841 wait_event(mddev
->recovery_wait
,
6842 atomic_read(&mddev
->recovery_active
) == 0);
6843 mddev
->curr_resync_completed
=
6845 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6846 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6849 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6850 /* As this condition is controlled by user-space,
6851 * we can block indefinitely, so use '_interruptible'
6852 * to avoid triggering warnings.
6854 flush_signals(current
); /* just in case */
6855 wait_event_interruptible(mddev
->recovery_wait
,
6856 mddev
->resync_max
> j
6857 || kthread_should_stop());
6860 if (kthread_should_stop())
6863 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6864 currspeed
< speed_min(mddev
));
6866 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6870 if (!skipped
) { /* actual IO requested */
6871 io_sectors
+= sectors
;
6872 atomic_add(sectors
, &mddev
->recovery_active
);
6876 if (j
>1) mddev
->curr_resync
= j
;
6877 mddev
->curr_mark_cnt
= io_sectors
;
6878 if (last_check
== 0)
6879 /* this is the earliers that rebuilt will be
6880 * visible in /proc/mdstat
6882 md_new_event(mddev
);
6884 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6887 last_check
= io_sectors
;
6889 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6893 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6895 int next
= (last_mark
+1) % SYNC_MARKS
;
6897 mddev
->resync_mark
= mark
[next
];
6898 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6899 mark
[next
] = jiffies
;
6900 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6905 if (kthread_should_stop())
6910 * this loop exits only if either when we are slower than
6911 * the 'hard' speed limit, or the system was IO-idle for
6913 * the system might be non-idle CPU-wise, but we only care
6914 * about not overloading the IO subsystem. (things like an
6915 * e2fsck being done on the RAID array should execute fast)
6920 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6921 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6923 if (currspeed
> speed_min(mddev
)) {
6924 if ((currspeed
> speed_max(mddev
)) ||
6925 !is_mddev_idle(mddev
, 0)) {
6931 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6933 * this also signals 'finished resyncing' to md_stop
6938 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6940 /* tell personality that we are finished */
6941 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6943 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6944 mddev
->curr_resync
> 2) {
6945 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6946 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6947 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6949 "md: checkpointing %s of %s.\n",
6950 desc
, mdname(mddev
));
6951 mddev
->recovery_cp
= mddev
->curr_resync
;
6954 mddev
->recovery_cp
= MaxSector
;
6956 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6957 mddev
->curr_resync
= MaxSector
;
6959 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6960 if (rdev
->raid_disk
>= 0 &&
6961 mddev
->delta_disks
>= 0 &&
6962 !test_bit(Faulty
, &rdev
->flags
) &&
6963 !test_bit(In_sync
, &rdev
->flags
) &&
6964 rdev
->recovery_offset
< mddev
->curr_resync
)
6965 rdev
->recovery_offset
= mddev
->curr_resync
;
6969 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6972 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6973 /* We completed so min/max setting can be forgotten if used. */
6974 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6975 mddev
->resync_min
= 0;
6976 mddev
->resync_max
= MaxSector
;
6977 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6978 mddev
->resync_min
= mddev
->curr_resync_completed
;
6979 mddev
->curr_resync
= 0;
6980 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6981 mddev
->curr_resync_completed
= 0;
6982 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6983 wake_up(&resync_wait
);
6984 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6985 md_wakeup_thread(mddev
->thread
);
6990 * got a signal, exit.
6993 "md: md_do_sync() got signal ... exiting\n");
6994 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6998 EXPORT_SYMBOL_GPL(md_do_sync
);
7001 static int remove_and_add_spares(mddev_t
*mddev
)
7006 mddev
->curr_resync_completed
= 0;
7008 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7009 if (rdev
->raid_disk
>= 0 &&
7010 !test_bit(Blocked
, &rdev
->flags
) &&
7011 (test_bit(Faulty
, &rdev
->flags
) ||
7012 ! test_bit(In_sync
, &rdev
->flags
)) &&
7013 atomic_read(&rdev
->nr_pending
)==0) {
7014 if (mddev
->pers
->hot_remove_disk(
7015 mddev
, rdev
->raid_disk
)==0) {
7017 sprintf(nm
,"rd%d", rdev
->raid_disk
);
7018 sysfs_remove_link(&mddev
->kobj
, nm
);
7019 rdev
->raid_disk
= -1;
7023 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
7024 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7025 if (rdev
->raid_disk
>= 0 &&
7026 !test_bit(In_sync
, &rdev
->flags
) &&
7027 !test_bit(Blocked
, &rdev
->flags
))
7029 if (rdev
->raid_disk
< 0
7030 && !test_bit(Faulty
, &rdev
->flags
)) {
7031 rdev
->recovery_offset
= 0;
7033 hot_add_disk(mddev
, rdev
) == 0) {
7035 sprintf(nm
, "rd%d", rdev
->raid_disk
);
7036 if (sysfs_create_link(&mddev
->kobj
,
7038 /* failure here is OK */;
7040 md_new_event(mddev
);
7041 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7050 static void reap_sync_thread(mddev_t
*mddev
)
7054 /* resync has finished, collect result */
7055 md_unregister_thread(mddev
->sync_thread
);
7056 mddev
->sync_thread
= NULL
;
7057 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7058 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7060 /* activate any spares */
7061 if (mddev
->pers
->spare_active(mddev
))
7062 sysfs_notify(&mddev
->kobj
, NULL
,
7065 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7066 mddev
->pers
->finish_reshape
)
7067 mddev
->pers
->finish_reshape(mddev
);
7068 md_update_sb(mddev
, 1);
7070 /* if array is no-longer degraded, then any saved_raid_disk
7071 * information must be scrapped
7073 if (!mddev
->degraded
)
7074 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7075 rdev
->saved_raid_disk
= -1;
7077 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7078 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7079 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7080 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7081 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7082 /* flag recovery needed just to double check */
7083 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7084 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7085 md_new_event(mddev
);
7089 * This routine is regularly called by all per-raid-array threads to
7090 * deal with generic issues like resync and super-block update.
7091 * Raid personalities that don't have a thread (linear/raid0) do not
7092 * need this as they never do any recovery or update the superblock.
7094 * It does not do any resync itself, but rather "forks" off other threads
7095 * to do that as needed.
7096 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7097 * "->recovery" and create a thread at ->sync_thread.
7098 * When the thread finishes it sets MD_RECOVERY_DONE
7099 * and wakeups up this thread which will reap the thread and finish up.
7100 * This thread also removes any faulty devices (with nr_pending == 0).
7102 * The overall approach is:
7103 * 1/ if the superblock needs updating, update it.
7104 * 2/ If a recovery thread is running, don't do anything else.
7105 * 3/ If recovery has finished, clean up, possibly marking spares active.
7106 * 4/ If there are any faulty devices, remove them.
7107 * 5/ If array is degraded, try to add spares devices
7108 * 6/ If array has spares or is not in-sync, start a resync thread.
7110 void md_check_recovery(mddev_t
*mddev
)
7113 bitmap_daemon_work(mddev
);
7118 if (signal_pending(current
)) {
7119 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7120 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7122 mddev
->safemode
= 2;
7124 flush_signals(current
);
7127 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7130 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7131 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7132 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7133 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7134 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7135 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7139 if (mddev_trylock(mddev
)) {
7143 /* Only thing we do on a ro array is remove
7146 remove_and_add_spares(mddev
);
7147 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7151 if (!mddev
->external
) {
7153 spin_lock_irq(&mddev
->write_lock
);
7154 if (mddev
->safemode
&&
7155 !atomic_read(&mddev
->writes_pending
) &&
7157 mddev
->recovery_cp
== MaxSector
) {
7160 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7162 if (mddev
->safemode
== 1)
7163 mddev
->safemode
= 0;
7164 spin_unlock_irq(&mddev
->write_lock
);
7166 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7170 md_update_sb(mddev
, 0);
7172 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7173 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7174 /* resync/recovery still happening */
7175 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7178 if (mddev
->sync_thread
) {
7179 reap_sync_thread(mddev
);
7182 /* Set RUNNING before clearing NEEDED to avoid
7183 * any transients in the value of "sync_action".
7185 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7186 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7187 /* Clear some bits that don't mean anything, but
7190 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7191 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7193 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7195 /* no recovery is running.
7196 * remove any failed drives, then
7197 * add spares if possible.
7198 * Spare are also removed and re-added, to allow
7199 * the personality to fail the re-add.
7202 if (mddev
->reshape_position
!= MaxSector
) {
7203 if (mddev
->pers
->check_reshape
== NULL
||
7204 mddev
->pers
->check_reshape(mddev
) != 0)
7205 /* Cannot proceed */
7207 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7208 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7209 } else if ((spares
= remove_and_add_spares(mddev
))) {
7210 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7211 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7212 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7213 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7214 } else if (mddev
->recovery_cp
< MaxSector
) {
7215 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7216 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7217 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7218 /* nothing to be done ... */
7221 if (mddev
->pers
->sync_request
) {
7222 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7223 /* We are adding a device or devices to an array
7224 * which has the bitmap stored on all devices.
7225 * So make sure all bitmap pages get written
7227 bitmap_write_all(mddev
->bitmap
);
7229 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7232 if (!mddev
->sync_thread
) {
7233 printk(KERN_ERR
"%s: could not start resync"
7236 /* leave the spares where they are, it shouldn't hurt */
7237 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7238 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7239 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7240 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7241 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7243 md_wakeup_thread(mddev
->sync_thread
);
7244 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7245 md_new_event(mddev
);
7248 if (!mddev
->sync_thread
) {
7249 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7250 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7252 if (mddev
->sysfs_action
)
7253 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7255 mddev_unlock(mddev
);
7259 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7261 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7262 wait_event_timeout(rdev
->blocked_wait
,
7263 !test_bit(Blocked
, &rdev
->flags
),
7264 msecs_to_jiffies(5000));
7265 rdev_dec_pending(rdev
, mddev
);
7267 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7269 static int md_notify_reboot(struct notifier_block
*this,
7270 unsigned long code
, void *x
)
7272 struct list_head
*tmp
;
7275 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7277 printk(KERN_INFO
"md: stopping all md devices.\n");
7279 for_each_mddev(mddev
, tmp
)
7280 if (mddev_trylock(mddev
)) {
7281 /* Force a switch to readonly even array
7282 * appears to still be in use. Hence
7285 md_set_readonly(mddev
, 100);
7286 mddev_unlock(mddev
);
7289 * certain more exotic SCSI devices are known to be
7290 * volatile wrt too early system reboots. While the
7291 * right place to handle this issue is the given
7292 * driver, we do want to have a safe RAID driver ...
7299 static struct notifier_block md_notifier
= {
7300 .notifier_call
= md_notify_reboot
,
7302 .priority
= INT_MAX
, /* before any real devices */
7305 static void md_geninit(void)
7307 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7309 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7312 static int __init
md_init(void)
7316 md_wq
= alloc_workqueue("md", WQ_RESCUER
, 0);
7320 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
7324 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
7327 if ((ret
= register_blkdev(0, "mdp")) < 0)
7331 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7332 md_probe
, NULL
, NULL
);
7333 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7334 md_probe
, NULL
, NULL
);
7336 register_reboot_notifier(&md_notifier
);
7337 raid_table_header
= register_sysctl_table(raid_root_table
);
7343 unregister_blkdev(MD_MAJOR
, "md");
7345 destroy_workqueue(md_misc_wq
);
7347 destroy_workqueue(md_wq
);
7355 * Searches all registered partitions for autorun RAID arrays
7359 static LIST_HEAD(all_detected_devices
);
7360 struct detected_devices_node
{
7361 struct list_head list
;
7365 void md_autodetect_dev(dev_t dev
)
7367 struct detected_devices_node
*node_detected_dev
;
7369 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7370 if (node_detected_dev
) {
7371 node_detected_dev
->dev
= dev
;
7372 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7374 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7375 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7380 static void autostart_arrays(int part
)
7383 struct detected_devices_node
*node_detected_dev
;
7385 int i_scanned
, i_passed
;
7390 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7392 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7394 node_detected_dev
= list_entry(all_detected_devices
.next
,
7395 struct detected_devices_node
, list
);
7396 list_del(&node_detected_dev
->list
);
7397 dev
= node_detected_dev
->dev
;
7398 kfree(node_detected_dev
);
7399 rdev
= md_import_device(dev
,0, 90);
7403 if (test_bit(Faulty
, &rdev
->flags
)) {
7407 set_bit(AutoDetected
, &rdev
->flags
);
7408 list_add(&rdev
->same_set
, &pending_raid_disks
);
7412 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7413 i_scanned
, i_passed
);
7415 autorun_devices(part
);
7418 #endif /* !MODULE */
7420 static __exit
void md_exit(void)
7423 struct list_head
*tmp
;
7425 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7426 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7428 unregister_blkdev(MD_MAJOR
,"md");
7429 unregister_blkdev(mdp_major
, "mdp");
7430 unregister_reboot_notifier(&md_notifier
);
7431 unregister_sysctl_table(raid_table_header
);
7432 remove_proc_entry("mdstat", NULL
);
7433 for_each_mddev(mddev
, tmp
) {
7434 export_array(mddev
);
7435 mddev
->hold_active
= 0;
7437 destroy_workqueue(md_misc_wq
);
7438 destroy_workqueue(md_wq
);
7441 subsys_initcall(md_init
);
7442 module_exit(md_exit
)
7444 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7446 return sprintf(buffer
, "%d", start_readonly
);
7448 static int set_ro(const char *val
, struct kernel_param
*kp
)
7451 int num
= simple_strtoul(val
, &e
, 10);
7452 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7453 start_readonly
= num
;
7459 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7460 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7462 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7464 EXPORT_SYMBOL(register_md_personality
);
7465 EXPORT_SYMBOL(unregister_md_personality
);
7466 EXPORT_SYMBOL(md_error
);
7467 EXPORT_SYMBOL(md_done_sync
);
7468 EXPORT_SYMBOL(md_write_start
);
7469 EXPORT_SYMBOL(md_write_end
);
7470 EXPORT_SYMBOL(md_register_thread
);
7471 EXPORT_SYMBOL(md_unregister_thread
);
7472 EXPORT_SYMBOL(md_wakeup_thread
);
7473 EXPORT_SYMBOL(md_check_recovery
);
7474 MODULE_LICENSE("GPL");
7475 MODULE_DESCRIPTION("MD RAID framework");
7477 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);