2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part
);
64 static LIST_HEAD(pers_list
);
65 static DEFINE_SPINLOCK(pers_lock
);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
70 static struct workqueue_struct
*md_wq
;
71 static struct workqueue_struct
*md_misc_wq
;
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min
= 1000;
95 static int sysctl_speed_limit_max
= 200000;
96 static inline int speed_min(mddev_t
*mddev
)
98 return mddev
->sync_speed_min
?
99 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
102 static inline int speed_max(mddev_t
*mddev
)
104 return mddev
->sync_speed_max
?
105 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
108 static struct ctl_table_header
*raid_table_header
;
110 static ctl_table raid_table
[] = {
112 .procname
= "speed_limit_min",
113 .data
= &sysctl_speed_limit_min
,
114 .maxlen
= sizeof(int),
115 .mode
= S_IRUGO
|S_IWUSR
,
116 .proc_handler
= proc_dointvec
,
119 .procname
= "speed_limit_max",
120 .data
= &sysctl_speed_limit_max
,
121 .maxlen
= sizeof(int),
122 .mode
= S_IRUGO
|S_IWUSR
,
123 .proc_handler
= proc_dointvec
,
128 static ctl_table raid_dir_table
[] = {
132 .mode
= S_IRUGO
|S_IXUGO
,
138 static ctl_table raid_root_table
[] = {
143 .child
= raid_dir_table
,
148 static const struct block_device_operations md_fops
;
150 static int start_readonly
;
153 * like bio_clone, but with a local bio set
156 static void mddev_bio_destructor(struct bio
*bio
)
158 mddev_t
*mddev
, **mddevp
;
163 bio_free(bio
, mddev
->bio_set
);
166 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
172 if (!mddev
|| !mddev
->bio_set
)
173 return bio_alloc(gfp_mask
, nr_iovecs
);
175 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
,
181 b
->bi_destructor
= mddev_bio_destructor
;
184 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
186 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
192 if (!mddev
|| !mddev
->bio_set
)
193 return bio_clone(bio
, gfp_mask
);
195 b
= bio_alloc_bioset(gfp_mask
, bio
->bi_max_vecs
,
201 b
->bi_destructor
= mddev_bio_destructor
;
203 if (bio_integrity(bio
)) {
206 ret
= bio_integrity_clone(b
, bio
, gfp_mask
, mddev
->bio_set
);
216 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
219 * We have a system wide 'event count' that is incremented
220 * on any 'interesting' event, and readers of /proc/mdstat
221 * can use 'poll' or 'select' to find out when the event
225 * start array, stop array, error, add device, remove device,
226 * start build, activate spare
228 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
229 static atomic_t md_event_count
;
230 void md_new_event(mddev_t
*mddev
)
232 atomic_inc(&md_event_count
);
233 wake_up(&md_event_waiters
);
235 EXPORT_SYMBOL_GPL(md_new_event
);
237 /* Alternate version that can be called from interrupts
238 * when calling sysfs_notify isn't needed.
240 static void md_new_event_inintr(mddev_t
*mddev
)
242 atomic_inc(&md_event_count
);
243 wake_up(&md_event_waiters
);
247 * Enables to iterate over all existing md arrays
248 * all_mddevs_lock protects this list.
250 static LIST_HEAD(all_mddevs
);
251 static DEFINE_SPINLOCK(all_mddevs_lock
);
255 * iterates through all used mddevs in the system.
256 * We take care to grab the all_mddevs_lock whenever navigating
257 * the list, and to always hold a refcount when unlocked.
258 * Any code which breaks out of this loop while own
259 * a reference to the current mddev and must mddev_put it.
261 #define for_each_mddev(mddev,tmp) \
263 for (({ spin_lock(&all_mddevs_lock); \
264 tmp = all_mddevs.next; \
266 ({ if (tmp != &all_mddevs) \
267 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
268 spin_unlock(&all_mddevs_lock); \
269 if (mddev) mddev_put(mddev); \
270 mddev = list_entry(tmp, mddev_t, all_mddevs); \
271 tmp != &all_mddevs;}); \
272 ({ spin_lock(&all_mddevs_lock); \
277 /* Rather than calling directly into the personality make_request function,
278 * IO requests come here first so that we can check if the device is
279 * being suspended pending a reconfiguration.
280 * We hold a refcount over the call to ->make_request. By the time that
281 * call has finished, the bio has been linked into some internal structure
282 * and so is visible to ->quiesce(), so we don't need the refcount any more.
284 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
286 const int rw
= bio_data_dir(bio
);
287 mddev_t
*mddev
= q
->queuedata
;
291 if (mddev
== NULL
|| mddev
->pers
== NULL
296 smp_rmb(); /* Ensure implications of 'active' are visible */
298 if (mddev
->suspended
) {
301 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
302 TASK_UNINTERRUPTIBLE
);
303 if (!mddev
->suspended
)
309 finish_wait(&mddev
->sb_wait
, &__wait
);
311 atomic_inc(&mddev
->active_io
);
314 rv
= mddev
->pers
->make_request(mddev
, bio
);
316 cpu
= part_stat_lock();
317 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
318 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
],
322 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
323 wake_up(&mddev
->sb_wait
);
328 /* mddev_suspend makes sure no new requests are submitted
329 * to the device, and that any requests that have been submitted
330 * are completely handled.
331 * Once ->stop is called and completes, the module will be completely
334 void mddev_suspend(mddev_t
*mddev
)
336 BUG_ON(mddev
->suspended
);
337 mddev
->suspended
= 1;
339 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
340 mddev
->pers
->quiesce(mddev
, 1);
342 EXPORT_SYMBOL_GPL(mddev_suspend
);
344 void mddev_resume(mddev_t
*mddev
)
346 mddev
->suspended
= 0;
347 wake_up(&mddev
->sb_wait
);
348 mddev
->pers
->quiesce(mddev
, 0);
350 EXPORT_SYMBOL_GPL(mddev_resume
);
352 int mddev_congested(mddev_t
*mddev
, int bits
)
354 return mddev
->suspended
;
356 EXPORT_SYMBOL(mddev_congested
);
359 * Generic flush handling for md
362 static void md_end_flush(struct bio
*bio
, int err
)
364 mdk_rdev_t
*rdev
= bio
->bi_private
;
365 mddev_t
*mddev
= rdev
->mddev
;
367 rdev_dec_pending(rdev
, mddev
);
369 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
370 /* The pre-request flush has finished */
371 queue_work(md_wq
, &mddev
->flush_work
);
376 static void md_submit_flush_data(struct work_struct
*ws
);
378 static void submit_flushes(struct work_struct
*ws
)
380 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
383 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
384 atomic_set(&mddev
->flush_pending
, 1);
386 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
387 if (rdev
->raid_disk
>= 0 &&
388 !test_bit(Faulty
, &rdev
->flags
)) {
389 /* Take two references, one is dropped
390 * when request finishes, one after
391 * we reclaim rcu_read_lock
394 atomic_inc(&rdev
->nr_pending
);
395 atomic_inc(&rdev
->nr_pending
);
397 bi
= bio_alloc_mddev(GFP_KERNEL
, 0, mddev
);
398 bi
->bi_end_io
= md_end_flush
;
399 bi
->bi_private
= rdev
;
400 bi
->bi_bdev
= rdev
->bdev
;
401 atomic_inc(&mddev
->flush_pending
);
402 submit_bio(WRITE_FLUSH
, bi
);
404 rdev_dec_pending(rdev
, mddev
);
407 if (atomic_dec_and_test(&mddev
->flush_pending
))
408 queue_work(md_wq
, &mddev
->flush_work
);
411 static void md_submit_flush_data(struct work_struct
*ws
)
413 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
414 struct bio
*bio
= mddev
->flush_bio
;
416 if (bio
->bi_size
== 0)
417 /* an empty barrier - all done */
420 bio
->bi_rw
&= ~REQ_FLUSH
;
421 if (mddev
->pers
->make_request(mddev
, bio
))
422 generic_make_request(bio
);
425 mddev
->flush_bio
= NULL
;
426 wake_up(&mddev
->sb_wait
);
429 void md_flush_request(mddev_t
*mddev
, struct bio
*bio
)
431 spin_lock_irq(&mddev
->write_lock
);
432 wait_event_lock_irq(mddev
->sb_wait
,
434 mddev
->write_lock
, /*nothing*/);
435 mddev
->flush_bio
= bio
;
436 spin_unlock_irq(&mddev
->write_lock
);
438 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
439 queue_work(md_wq
, &mddev
->flush_work
);
441 EXPORT_SYMBOL(md_flush_request
);
443 /* Support for plugging.
444 * This mirrors the plugging support in request_queue, but does not
445 * require having a whole queue
447 static void plugger_work(struct work_struct
*work
)
449 struct plug_handle
*plug
=
450 container_of(work
, struct plug_handle
, unplug_work
);
451 plug
->unplug_fn(plug
);
453 static void plugger_timeout(unsigned long data
)
455 struct plug_handle
*plug
= (void *)data
;
456 kblockd_schedule_work(NULL
, &plug
->unplug_work
);
458 void plugger_init(struct plug_handle
*plug
,
459 void (*unplug_fn
)(struct plug_handle
*))
461 plug
->unplug_flag
= 0;
462 plug
->unplug_fn
= unplug_fn
;
463 init_timer(&plug
->unplug_timer
);
464 plug
->unplug_timer
.function
= plugger_timeout
;
465 plug
->unplug_timer
.data
= (unsigned long)plug
;
466 INIT_WORK(&plug
->unplug_work
, plugger_work
);
468 EXPORT_SYMBOL_GPL(plugger_init
);
470 void plugger_set_plug(struct plug_handle
*plug
)
472 if (!test_and_set_bit(PLUGGED_FLAG
, &plug
->unplug_flag
))
473 mod_timer(&plug
->unplug_timer
, jiffies
+ msecs_to_jiffies(3)+1);
475 EXPORT_SYMBOL_GPL(plugger_set_plug
);
477 int plugger_remove_plug(struct plug_handle
*plug
)
479 if (test_and_clear_bit(PLUGGED_FLAG
, &plug
->unplug_flag
)) {
480 del_timer(&plug
->unplug_timer
);
485 EXPORT_SYMBOL_GPL(plugger_remove_plug
);
488 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
490 atomic_inc(&mddev
->active
);
494 static void mddev_delayed_delete(struct work_struct
*ws
);
496 static void mddev_put(mddev_t
*mddev
)
498 struct bio_set
*bs
= NULL
;
500 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
502 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
503 mddev
->ctime
== 0 && !mddev
->hold_active
) {
504 /* Array is not configured at all, and not held active,
506 list_del(&mddev
->all_mddevs
);
508 mddev
->bio_set
= NULL
;
509 if (mddev
->gendisk
) {
510 /* We did a probe so need to clean up. Call
511 * queue_work inside the spinlock so that
512 * flush_workqueue() after mddev_find will
513 * succeed in waiting for the work to be done.
515 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
516 queue_work(md_misc_wq
, &mddev
->del_work
);
520 spin_unlock(&all_mddevs_lock
);
525 void mddev_init(mddev_t
*mddev
)
527 mutex_init(&mddev
->open_mutex
);
528 mutex_init(&mddev
->reconfig_mutex
);
529 mutex_init(&mddev
->bitmap_info
.mutex
);
530 INIT_LIST_HEAD(&mddev
->disks
);
531 INIT_LIST_HEAD(&mddev
->all_mddevs
);
532 init_timer(&mddev
->safemode_timer
);
533 atomic_set(&mddev
->active
, 1);
534 atomic_set(&mddev
->openers
, 0);
535 atomic_set(&mddev
->active_io
, 0);
536 spin_lock_init(&mddev
->write_lock
);
537 atomic_set(&mddev
->flush_pending
, 0);
538 init_waitqueue_head(&mddev
->sb_wait
);
539 init_waitqueue_head(&mddev
->recovery_wait
);
540 mddev
->reshape_position
= MaxSector
;
541 mddev
->resync_min
= 0;
542 mddev
->resync_max
= MaxSector
;
543 mddev
->level
= LEVEL_NONE
;
545 EXPORT_SYMBOL_GPL(mddev_init
);
547 static mddev_t
* mddev_find(dev_t unit
)
549 mddev_t
*mddev
, *new = NULL
;
552 spin_lock(&all_mddevs_lock
);
555 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
556 if (mddev
->unit
== unit
) {
558 spin_unlock(&all_mddevs_lock
);
564 list_add(&new->all_mddevs
, &all_mddevs
);
565 spin_unlock(&all_mddevs_lock
);
566 new->hold_active
= UNTIL_IOCTL
;
570 /* find an unused unit number */
571 static int next_minor
= 512;
572 int start
= next_minor
;
576 dev
= MKDEV(MD_MAJOR
, next_minor
);
578 if (next_minor
> MINORMASK
)
580 if (next_minor
== start
) {
581 /* Oh dear, all in use. */
582 spin_unlock(&all_mddevs_lock
);
588 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
589 if (mddev
->unit
== dev
) {
595 new->md_minor
= MINOR(dev
);
596 new->hold_active
= UNTIL_STOP
;
597 list_add(&new->all_mddevs
, &all_mddevs
);
598 spin_unlock(&all_mddevs_lock
);
601 spin_unlock(&all_mddevs_lock
);
603 new = kzalloc(sizeof(*new), GFP_KERNEL
);
608 if (MAJOR(unit
) == MD_MAJOR
)
609 new->md_minor
= MINOR(unit
);
611 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
618 static inline int mddev_lock(mddev_t
* mddev
)
620 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
623 static inline int mddev_is_locked(mddev_t
*mddev
)
625 return mutex_is_locked(&mddev
->reconfig_mutex
);
628 static inline int mddev_trylock(mddev_t
* mddev
)
630 return mutex_trylock(&mddev
->reconfig_mutex
);
633 static struct attribute_group md_redundancy_group
;
635 static void mddev_unlock(mddev_t
* mddev
)
637 if (mddev
->to_remove
) {
638 /* These cannot be removed under reconfig_mutex as
639 * an access to the files will try to take reconfig_mutex
640 * while holding the file unremovable, which leads to
642 * So hold set sysfs_active while the remove in happeing,
643 * and anything else which might set ->to_remove or my
644 * otherwise change the sysfs namespace will fail with
645 * -EBUSY if sysfs_active is still set.
646 * We set sysfs_active under reconfig_mutex and elsewhere
647 * test it under the same mutex to ensure its correct value
650 struct attribute_group
*to_remove
= mddev
->to_remove
;
651 mddev
->to_remove
= NULL
;
652 mddev
->sysfs_active
= 1;
653 mutex_unlock(&mddev
->reconfig_mutex
);
655 if (mddev
->kobj
.sd
) {
656 if (to_remove
!= &md_redundancy_group
)
657 sysfs_remove_group(&mddev
->kobj
, to_remove
);
658 if (mddev
->pers
== NULL
||
659 mddev
->pers
->sync_request
== NULL
) {
660 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
661 if (mddev
->sysfs_action
)
662 sysfs_put(mddev
->sysfs_action
);
663 mddev
->sysfs_action
= NULL
;
666 mddev
->sysfs_active
= 0;
668 mutex_unlock(&mddev
->reconfig_mutex
);
670 md_wakeup_thread(mddev
->thread
);
673 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
677 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
678 if (rdev
->desc_nr
== nr
)
684 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
688 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
689 if (rdev
->bdev
->bd_dev
== dev
)
695 static struct mdk_personality
*find_pers(int level
, char *clevel
)
697 struct mdk_personality
*pers
;
698 list_for_each_entry(pers
, &pers_list
, list
) {
699 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
701 if (strcmp(pers
->name
, clevel
)==0)
707 /* return the offset of the super block in 512byte sectors */
708 static inline sector_t
calc_dev_sboffset(mdk_rdev_t
*rdev
)
710 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
711 return MD_NEW_SIZE_SECTORS(num_sectors
);
714 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
719 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
720 if (!rdev
->sb_page
) {
721 printk(KERN_ALERT
"md: out of memory.\n");
728 static void free_disk_sb(mdk_rdev_t
* rdev
)
731 put_page(rdev
->sb_page
);
733 rdev
->sb_page
= NULL
;
740 static void super_written(struct bio
*bio
, int error
)
742 mdk_rdev_t
*rdev
= bio
->bi_private
;
743 mddev_t
*mddev
= rdev
->mddev
;
745 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
746 printk("md: super_written gets error=%d, uptodate=%d\n",
747 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
748 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
749 md_error(mddev
, rdev
);
752 if (atomic_dec_and_test(&mddev
->pending_writes
))
753 wake_up(&mddev
->sb_wait
);
757 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
758 sector_t sector
, int size
, struct page
*page
)
760 /* write first size bytes of page to sector of rdev
761 * Increment mddev->pending_writes before returning
762 * and decrement it on completion, waking up sb_wait
763 * if zero is reached.
764 * If an error occurred, call md_error
766 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
768 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
769 bio
->bi_sector
= sector
;
770 bio_add_page(bio
, page
, size
, 0);
771 bio
->bi_private
= rdev
;
772 bio
->bi_end_io
= super_written
;
774 atomic_inc(&mddev
->pending_writes
);
775 submit_bio(REQ_WRITE
| REQ_SYNC
| REQ_UNPLUG
| REQ_FLUSH
| REQ_FUA
,
779 void md_super_wait(mddev_t
*mddev
)
781 /* wait for all superblock writes that were scheduled to complete */
784 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
785 if (atomic_read(&mddev
->pending_writes
)==0)
789 finish_wait(&mddev
->sb_wait
, &wq
);
792 static void bi_complete(struct bio
*bio
, int error
)
794 complete((struct completion
*)bio
->bi_private
);
797 int sync_page_io(mdk_rdev_t
*rdev
, sector_t sector
, int size
,
798 struct page
*page
, int rw
, bool metadata_op
)
800 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
801 struct completion event
;
804 rw
|= REQ_SYNC
| REQ_UNPLUG
;
806 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
807 rdev
->meta_bdev
: rdev
->bdev
;
809 bio
->bi_sector
= sector
+ rdev
->sb_start
;
811 bio
->bi_sector
= sector
+ rdev
->data_offset
;
812 bio_add_page(bio
, page
, size
, 0);
813 init_completion(&event
);
814 bio
->bi_private
= &event
;
815 bio
->bi_end_io
= bi_complete
;
817 wait_for_completion(&event
);
819 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
823 EXPORT_SYMBOL_GPL(sync_page_io
);
825 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
827 char b
[BDEVNAME_SIZE
];
828 if (!rdev
->sb_page
) {
836 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
842 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
843 bdevname(rdev
->bdev
,b
));
847 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
849 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
850 sb1
->set_uuid1
== sb2
->set_uuid1
&&
851 sb1
->set_uuid2
== sb2
->set_uuid2
&&
852 sb1
->set_uuid3
== sb2
->set_uuid3
;
855 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
858 mdp_super_t
*tmp1
, *tmp2
;
860 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
861 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
863 if (!tmp1
|| !tmp2
) {
865 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
873 * nr_disks is not constant
878 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
886 static u32
md_csum_fold(u32 csum
)
888 csum
= (csum
& 0xffff) + (csum
>> 16);
889 return (csum
& 0xffff) + (csum
>> 16);
892 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
895 u32
*sb32
= (u32
*)sb
;
897 unsigned int disk_csum
, csum
;
899 disk_csum
= sb
->sb_csum
;
902 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
904 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
908 /* This used to use csum_partial, which was wrong for several
909 * reasons including that different results are returned on
910 * different architectures. It isn't critical that we get exactly
911 * the same return value as before (we always csum_fold before
912 * testing, and that removes any differences). However as we
913 * know that csum_partial always returned a 16bit value on
914 * alphas, do a fold to maximise conformity to previous behaviour.
916 sb
->sb_csum
= md_csum_fold(disk_csum
);
918 sb
->sb_csum
= disk_csum
;
925 * Handle superblock details.
926 * We want to be able to handle multiple superblock formats
927 * so we have a common interface to them all, and an array of
928 * different handlers.
929 * We rely on user-space to write the initial superblock, and support
930 * reading and updating of superblocks.
931 * Interface methods are:
932 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
933 * loads and validates a superblock on dev.
934 * if refdev != NULL, compare superblocks on both devices
936 * 0 - dev has a superblock that is compatible with refdev
937 * 1 - dev has a superblock that is compatible and newer than refdev
938 * so dev should be used as the refdev in future
939 * -EINVAL superblock incompatible or invalid
940 * -othererror e.g. -EIO
942 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
943 * Verify that dev is acceptable into mddev.
944 * The first time, mddev->raid_disks will be 0, and data from
945 * dev should be merged in. Subsequent calls check that dev
946 * is new enough. Return 0 or -EINVAL
948 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
949 * Update the superblock for rdev with data in mddev
950 * This does not write to disc.
956 struct module
*owner
;
957 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
959 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
960 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
961 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
962 sector_t num_sectors
);
966 * Check that the given mddev has no bitmap.
968 * This function is called from the run method of all personalities that do not
969 * support bitmaps. It prints an error message and returns non-zero if mddev
970 * has a bitmap. Otherwise, it returns 0.
973 int md_check_no_bitmap(mddev_t
*mddev
)
975 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
977 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
978 mdname(mddev
), mddev
->pers
->name
);
981 EXPORT_SYMBOL(md_check_no_bitmap
);
984 * load_super for 0.90.0
986 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
988 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
993 * Calculate the position of the superblock (512byte sectors),
994 * it's at the end of the disk.
996 * It also happens to be a multiple of 4Kb.
998 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1000 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1001 if (ret
) return ret
;
1005 bdevname(rdev
->bdev
, b
);
1006 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1008 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1009 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1014 if (sb
->major_version
!= 0 ||
1015 sb
->minor_version
< 90 ||
1016 sb
->minor_version
> 91) {
1017 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1018 sb
->major_version
, sb
->minor_version
,
1023 if (sb
->raid_disks
<= 0)
1026 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1027 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1032 rdev
->preferred_minor
= sb
->md_minor
;
1033 rdev
->data_offset
= 0;
1034 rdev
->sb_size
= MD_SB_BYTES
;
1036 if (sb
->level
== LEVEL_MULTIPATH
)
1039 rdev
->desc_nr
= sb
->this_disk
.number
;
1045 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
1046 if (!uuid_equal(refsb
, sb
)) {
1047 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1048 b
, bdevname(refdev
->bdev
,b2
));
1051 if (!sb_equal(refsb
, sb
)) {
1052 printk(KERN_WARNING
"md: %s has same UUID"
1053 " but different superblock to %s\n",
1054 b
, bdevname(refdev
->bdev
, b2
));
1058 ev2
= md_event(refsb
);
1064 rdev
->sectors
= rdev
->sb_start
;
1066 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
1067 /* "this cannot possibly happen" ... */
1075 * validate_super for 0.90.0
1077 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1080 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1081 __u64 ev1
= md_event(sb
);
1083 rdev
->raid_disk
= -1;
1084 clear_bit(Faulty
, &rdev
->flags
);
1085 clear_bit(In_sync
, &rdev
->flags
);
1086 clear_bit(WriteMostly
, &rdev
->flags
);
1088 if (mddev
->raid_disks
== 0) {
1089 mddev
->major_version
= 0;
1090 mddev
->minor_version
= sb
->minor_version
;
1091 mddev
->patch_version
= sb
->patch_version
;
1092 mddev
->external
= 0;
1093 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1094 mddev
->ctime
= sb
->ctime
;
1095 mddev
->utime
= sb
->utime
;
1096 mddev
->level
= sb
->level
;
1097 mddev
->clevel
[0] = 0;
1098 mddev
->layout
= sb
->layout
;
1099 mddev
->raid_disks
= sb
->raid_disks
;
1100 mddev
->dev_sectors
= sb
->size
* 2;
1101 mddev
->events
= ev1
;
1102 mddev
->bitmap_info
.offset
= 0;
1103 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1105 if (mddev
->minor_version
>= 91) {
1106 mddev
->reshape_position
= sb
->reshape_position
;
1107 mddev
->delta_disks
= sb
->delta_disks
;
1108 mddev
->new_level
= sb
->new_level
;
1109 mddev
->new_layout
= sb
->new_layout
;
1110 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1112 mddev
->reshape_position
= MaxSector
;
1113 mddev
->delta_disks
= 0;
1114 mddev
->new_level
= mddev
->level
;
1115 mddev
->new_layout
= mddev
->layout
;
1116 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1119 if (sb
->state
& (1<<MD_SB_CLEAN
))
1120 mddev
->recovery_cp
= MaxSector
;
1122 if (sb
->events_hi
== sb
->cp_events_hi
&&
1123 sb
->events_lo
== sb
->cp_events_lo
) {
1124 mddev
->recovery_cp
= sb
->recovery_cp
;
1126 mddev
->recovery_cp
= 0;
1129 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1130 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1131 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1132 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1134 mddev
->max_disks
= MD_SB_DISKS
;
1136 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1137 mddev
->bitmap_info
.file
== NULL
)
1138 mddev
->bitmap_info
.offset
=
1139 mddev
->bitmap_info
.default_offset
;
1141 } else if (mddev
->pers
== NULL
) {
1142 /* Insist on good event counter while assembling, except
1143 * for spares (which don't need an event count) */
1145 if (sb
->disks
[rdev
->desc_nr
].state
& (
1146 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1147 if (ev1
< mddev
->events
)
1149 } else if (mddev
->bitmap
) {
1150 /* if adding to array with a bitmap, then we can accept an
1151 * older device ... but not too old.
1153 if (ev1
< mddev
->bitmap
->events_cleared
)
1156 if (ev1
< mddev
->events
)
1157 /* just a hot-add of a new device, leave raid_disk at -1 */
1161 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1162 desc
= sb
->disks
+ rdev
->desc_nr
;
1164 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1165 set_bit(Faulty
, &rdev
->flags
);
1166 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1167 desc->raid_disk < mddev->raid_disks */) {
1168 set_bit(In_sync
, &rdev
->flags
);
1169 rdev
->raid_disk
= desc
->raid_disk
;
1170 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1171 /* active but not in sync implies recovery up to
1172 * reshape position. We don't know exactly where
1173 * that is, so set to zero for now */
1174 if (mddev
->minor_version
>= 91) {
1175 rdev
->recovery_offset
= 0;
1176 rdev
->raid_disk
= desc
->raid_disk
;
1179 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1180 set_bit(WriteMostly
, &rdev
->flags
);
1181 } else /* MULTIPATH are always insync */
1182 set_bit(In_sync
, &rdev
->flags
);
1187 * sync_super for 0.90.0
1189 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1193 int next_spare
= mddev
->raid_disks
;
1196 /* make rdev->sb match mddev data..
1199 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1200 * 3/ any empty disks < next_spare become removed
1202 * disks[0] gets initialised to REMOVED because
1203 * we cannot be sure from other fields if it has
1204 * been initialised or not.
1207 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1209 rdev
->sb_size
= MD_SB_BYTES
;
1211 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1213 memset(sb
, 0, sizeof(*sb
));
1215 sb
->md_magic
= MD_SB_MAGIC
;
1216 sb
->major_version
= mddev
->major_version
;
1217 sb
->patch_version
= mddev
->patch_version
;
1218 sb
->gvalid_words
= 0; /* ignored */
1219 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1220 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1221 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1222 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1224 sb
->ctime
= mddev
->ctime
;
1225 sb
->level
= mddev
->level
;
1226 sb
->size
= mddev
->dev_sectors
/ 2;
1227 sb
->raid_disks
= mddev
->raid_disks
;
1228 sb
->md_minor
= mddev
->md_minor
;
1229 sb
->not_persistent
= 0;
1230 sb
->utime
= mddev
->utime
;
1232 sb
->events_hi
= (mddev
->events
>>32);
1233 sb
->events_lo
= (u32
)mddev
->events
;
1235 if (mddev
->reshape_position
== MaxSector
)
1236 sb
->minor_version
= 90;
1238 sb
->minor_version
= 91;
1239 sb
->reshape_position
= mddev
->reshape_position
;
1240 sb
->new_level
= mddev
->new_level
;
1241 sb
->delta_disks
= mddev
->delta_disks
;
1242 sb
->new_layout
= mddev
->new_layout
;
1243 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1245 mddev
->minor_version
= sb
->minor_version
;
1248 sb
->recovery_cp
= mddev
->recovery_cp
;
1249 sb
->cp_events_hi
= (mddev
->events
>>32);
1250 sb
->cp_events_lo
= (u32
)mddev
->events
;
1251 if (mddev
->recovery_cp
== MaxSector
)
1252 sb
->state
= (1<< MD_SB_CLEAN
);
1254 sb
->recovery_cp
= 0;
1256 sb
->layout
= mddev
->layout
;
1257 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1259 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1260 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1262 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1263 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1266 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1268 if (rdev2
->raid_disk
>= 0 &&
1269 sb
->minor_version
>= 91)
1270 /* we have nowhere to store the recovery_offset,
1271 * but if it is not below the reshape_position,
1272 * we can piggy-back on that.
1275 if (rdev2
->raid_disk
< 0 ||
1276 test_bit(Faulty
, &rdev2
->flags
))
1279 desc_nr
= rdev2
->raid_disk
;
1281 desc_nr
= next_spare
++;
1282 rdev2
->desc_nr
= desc_nr
;
1283 d
= &sb
->disks
[rdev2
->desc_nr
];
1285 d
->number
= rdev2
->desc_nr
;
1286 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1287 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1289 d
->raid_disk
= rdev2
->raid_disk
;
1291 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1292 if (test_bit(Faulty
, &rdev2
->flags
))
1293 d
->state
= (1<<MD_DISK_FAULTY
);
1294 else if (is_active
) {
1295 d
->state
= (1<<MD_DISK_ACTIVE
);
1296 if (test_bit(In_sync
, &rdev2
->flags
))
1297 d
->state
|= (1<<MD_DISK_SYNC
);
1305 if (test_bit(WriteMostly
, &rdev2
->flags
))
1306 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1308 /* now set the "removed" and "faulty" bits on any missing devices */
1309 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1310 mdp_disk_t
*d
= &sb
->disks
[i
];
1311 if (d
->state
== 0 && d
->number
== 0) {
1314 d
->state
= (1<<MD_DISK_REMOVED
);
1315 d
->state
|= (1<<MD_DISK_FAULTY
);
1319 sb
->nr_disks
= nr_disks
;
1320 sb
->active_disks
= active
;
1321 sb
->working_disks
= working
;
1322 sb
->failed_disks
= failed
;
1323 sb
->spare_disks
= spare
;
1325 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1326 sb
->sb_csum
= calc_sb_csum(sb
);
1330 * rdev_size_change for 0.90.0
1332 static unsigned long long
1333 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1335 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1336 return 0; /* component must fit device */
1337 if (rdev
->mddev
->bitmap_info
.offset
)
1338 return 0; /* can't move bitmap */
1339 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1340 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1341 num_sectors
= rdev
->sb_start
;
1342 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1344 md_super_wait(rdev
->mddev
);
1350 * version 1 superblock
1353 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1357 unsigned long long newcsum
;
1358 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1359 __le32
*isuper
= (__le32
*)sb
;
1362 disk_csum
= sb
->sb_csum
;
1365 for (i
=0; size
>=4; size
-= 4 )
1366 newcsum
+= le32_to_cpu(*isuper
++);
1369 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1371 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1372 sb
->sb_csum
= disk_csum
;
1373 return cpu_to_le32(csum
);
1376 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1378 struct mdp_superblock_1
*sb
;
1381 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1385 * Calculate the position of the superblock in 512byte sectors.
1386 * It is always aligned to a 4K boundary and
1387 * depeding on minor_version, it can be:
1388 * 0: At least 8K, but less than 12K, from end of device
1389 * 1: At start of device
1390 * 2: 4K from start of device.
1392 switch(minor_version
) {
1394 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1396 sb_start
&= ~(sector_t
)(4*2-1);
1407 rdev
->sb_start
= sb_start
;
1409 /* superblock is rarely larger than 1K, but it can be larger,
1410 * and it is safe to read 4k, so we do that
1412 ret
= read_disk_sb(rdev
, 4096);
1413 if (ret
) return ret
;
1416 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1418 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1419 sb
->major_version
!= cpu_to_le32(1) ||
1420 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1421 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1422 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1425 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1426 printk("md: invalid superblock checksum on %s\n",
1427 bdevname(rdev
->bdev
,b
));
1430 if (le64_to_cpu(sb
->data_size
) < 10) {
1431 printk("md: data_size too small on %s\n",
1432 bdevname(rdev
->bdev
,b
));
1436 rdev
->preferred_minor
= 0xffff;
1437 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1438 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1440 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1441 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1442 if (rdev
->sb_size
& bmask
)
1443 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1446 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1449 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1452 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1458 struct mdp_superblock_1
*refsb
=
1459 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1461 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1462 sb
->level
!= refsb
->level
||
1463 sb
->layout
!= refsb
->layout
||
1464 sb
->chunksize
!= refsb
->chunksize
) {
1465 printk(KERN_WARNING
"md: %s has strangely different"
1466 " superblock to %s\n",
1467 bdevname(rdev
->bdev
,b
),
1468 bdevname(refdev
->bdev
,b2
));
1471 ev1
= le64_to_cpu(sb
->events
);
1472 ev2
= le64_to_cpu(refsb
->events
);
1480 rdev
->sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
1481 le64_to_cpu(sb
->data_offset
);
1483 rdev
->sectors
= rdev
->sb_start
;
1484 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1486 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1487 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1492 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1494 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1495 __u64 ev1
= le64_to_cpu(sb
->events
);
1497 rdev
->raid_disk
= -1;
1498 clear_bit(Faulty
, &rdev
->flags
);
1499 clear_bit(In_sync
, &rdev
->flags
);
1500 clear_bit(WriteMostly
, &rdev
->flags
);
1502 if (mddev
->raid_disks
== 0) {
1503 mddev
->major_version
= 1;
1504 mddev
->patch_version
= 0;
1505 mddev
->external
= 0;
1506 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1507 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1508 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1509 mddev
->level
= le32_to_cpu(sb
->level
);
1510 mddev
->clevel
[0] = 0;
1511 mddev
->layout
= le32_to_cpu(sb
->layout
);
1512 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1513 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1514 mddev
->events
= ev1
;
1515 mddev
->bitmap_info
.offset
= 0;
1516 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1518 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1519 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1521 mddev
->max_disks
= (4096-256)/2;
1523 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1524 mddev
->bitmap_info
.file
== NULL
)
1525 mddev
->bitmap_info
.offset
=
1526 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1528 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1529 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1530 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1531 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1532 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1533 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1535 mddev
->reshape_position
= MaxSector
;
1536 mddev
->delta_disks
= 0;
1537 mddev
->new_level
= mddev
->level
;
1538 mddev
->new_layout
= mddev
->layout
;
1539 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1542 } else if (mddev
->pers
== NULL
) {
1543 /* Insist of good event counter while assembling, except for
1544 * spares (which don't need an event count) */
1546 if (rdev
->desc_nr
>= 0 &&
1547 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1548 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1549 if (ev1
< mddev
->events
)
1551 } else if (mddev
->bitmap
) {
1552 /* If adding to array with a bitmap, then we can accept an
1553 * older device, but not too old.
1555 if (ev1
< mddev
->bitmap
->events_cleared
)
1558 if (ev1
< mddev
->events
)
1559 /* just a hot-add of a new device, leave raid_disk at -1 */
1562 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1564 if (rdev
->desc_nr
< 0 ||
1565 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1569 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1571 case 0xffff: /* spare */
1573 case 0xfffe: /* faulty */
1574 set_bit(Faulty
, &rdev
->flags
);
1577 if ((le32_to_cpu(sb
->feature_map
) &
1578 MD_FEATURE_RECOVERY_OFFSET
))
1579 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1581 set_bit(In_sync
, &rdev
->flags
);
1582 rdev
->raid_disk
= role
;
1585 if (sb
->devflags
& WriteMostly1
)
1586 set_bit(WriteMostly
, &rdev
->flags
);
1587 } else /* MULTIPATH are always insync */
1588 set_bit(In_sync
, &rdev
->flags
);
1593 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1595 struct mdp_superblock_1
*sb
;
1598 /* make rdev->sb match mddev and rdev data. */
1600 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1602 sb
->feature_map
= 0;
1604 sb
->recovery_offset
= cpu_to_le64(0);
1605 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1606 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1607 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1609 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1610 sb
->events
= cpu_to_le64(mddev
->events
);
1612 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1614 sb
->resync_offset
= cpu_to_le64(0);
1616 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1618 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1619 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1620 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1621 sb
->level
= cpu_to_le32(mddev
->level
);
1622 sb
->layout
= cpu_to_le32(mddev
->layout
);
1624 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1625 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1626 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1629 if (rdev
->raid_disk
>= 0 &&
1630 !test_bit(In_sync
, &rdev
->flags
)) {
1632 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1633 sb
->recovery_offset
=
1634 cpu_to_le64(rdev
->recovery_offset
);
1637 if (mddev
->reshape_position
!= MaxSector
) {
1638 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1639 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1640 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1641 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1642 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1643 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1647 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1648 if (rdev2
->desc_nr
+1 > max_dev
)
1649 max_dev
= rdev2
->desc_nr
+1;
1651 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1653 sb
->max_dev
= cpu_to_le32(max_dev
);
1654 rdev
->sb_size
= max_dev
* 2 + 256;
1655 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1656 if (rdev
->sb_size
& bmask
)
1657 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1659 max_dev
= le32_to_cpu(sb
->max_dev
);
1661 for (i
=0; i
<max_dev
;i
++)
1662 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1664 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1666 if (test_bit(Faulty
, &rdev2
->flags
))
1667 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1668 else if (test_bit(In_sync
, &rdev2
->flags
))
1669 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1670 else if (rdev2
->raid_disk
>= 0)
1671 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1673 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1676 sb
->sb_csum
= calc_sb_1_csum(sb
);
1679 static unsigned long long
1680 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1682 struct mdp_superblock_1
*sb
;
1683 sector_t max_sectors
;
1684 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1685 return 0; /* component must fit device */
1686 if (rdev
->sb_start
< rdev
->data_offset
) {
1687 /* minor versions 1 and 2; superblock before data */
1688 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1689 max_sectors
-= rdev
->data_offset
;
1690 if (!num_sectors
|| num_sectors
> max_sectors
)
1691 num_sectors
= max_sectors
;
1692 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1693 /* minor version 0 with bitmap we can't move */
1696 /* minor version 0; superblock after data */
1698 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1699 sb_start
&= ~(sector_t
)(4*2 - 1);
1700 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1701 if (!num_sectors
|| num_sectors
> max_sectors
)
1702 num_sectors
= max_sectors
;
1703 rdev
->sb_start
= sb_start
;
1705 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1706 sb
->data_size
= cpu_to_le64(num_sectors
);
1707 sb
->super_offset
= rdev
->sb_start
;
1708 sb
->sb_csum
= calc_sb_1_csum(sb
);
1709 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1711 md_super_wait(rdev
->mddev
);
1715 static struct super_type super_types
[] = {
1718 .owner
= THIS_MODULE
,
1719 .load_super
= super_90_load
,
1720 .validate_super
= super_90_validate
,
1721 .sync_super
= super_90_sync
,
1722 .rdev_size_change
= super_90_rdev_size_change
,
1726 .owner
= THIS_MODULE
,
1727 .load_super
= super_1_load
,
1728 .validate_super
= super_1_validate
,
1729 .sync_super
= super_1_sync
,
1730 .rdev_size_change
= super_1_rdev_size_change
,
1734 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1736 mdk_rdev_t
*rdev
, *rdev2
;
1739 rdev_for_each_rcu(rdev
, mddev1
)
1740 rdev_for_each_rcu(rdev2
, mddev2
)
1741 if (rdev
->bdev
->bd_contains
==
1742 rdev2
->bdev
->bd_contains
) {
1750 static LIST_HEAD(pending_raid_disks
);
1753 * Try to register data integrity profile for an mddev
1755 * This is called when an array is started and after a disk has been kicked
1756 * from the array. It only succeeds if all working and active component devices
1757 * are integrity capable with matching profiles.
1759 int md_integrity_register(mddev_t
*mddev
)
1761 mdk_rdev_t
*rdev
, *reference
= NULL
;
1763 if (list_empty(&mddev
->disks
))
1764 return 0; /* nothing to do */
1765 if (blk_get_integrity(mddev
->gendisk
))
1766 return 0; /* already registered */
1767 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1768 /* skip spares and non-functional disks */
1769 if (test_bit(Faulty
, &rdev
->flags
))
1771 if (rdev
->raid_disk
< 0)
1774 * If at least one rdev is not integrity capable, we can not
1775 * enable data integrity for the md device.
1777 if (!bdev_get_integrity(rdev
->bdev
))
1780 /* Use the first rdev as the reference */
1784 /* does this rdev's profile match the reference profile? */
1785 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1786 rdev
->bdev
->bd_disk
) < 0)
1790 * All component devices are integrity capable and have matching
1791 * profiles, register the common profile for the md device.
1793 if (blk_integrity_register(mddev
->gendisk
,
1794 bdev_get_integrity(reference
->bdev
)) != 0) {
1795 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1799 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1803 EXPORT_SYMBOL(md_integrity_register
);
1805 /* Disable data integrity if non-capable/non-matching disk is being added */
1806 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1808 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1809 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1811 if (!bi_mddev
) /* nothing to do */
1813 if (rdev
->raid_disk
< 0) /* skip spares */
1815 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1816 rdev
->bdev
->bd_disk
) >= 0)
1818 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1819 blk_integrity_unregister(mddev
->gendisk
);
1821 EXPORT_SYMBOL(md_integrity_add_rdev
);
1823 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1825 char b
[BDEVNAME_SIZE
];
1835 /* prevent duplicates */
1836 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1839 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1840 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1841 rdev
->sectors
< mddev
->dev_sectors
)) {
1843 /* Cannot change size, so fail
1844 * If mddev->level <= 0, then we don't care
1845 * about aligning sizes (e.g. linear)
1847 if (mddev
->level
> 0)
1850 mddev
->dev_sectors
= rdev
->sectors
;
1853 /* Verify rdev->desc_nr is unique.
1854 * If it is -1, assign a free number, else
1855 * check number is not in use
1857 if (rdev
->desc_nr
< 0) {
1859 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1860 while (find_rdev_nr(mddev
, choice
))
1862 rdev
->desc_nr
= choice
;
1864 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1867 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1868 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1869 mdname(mddev
), mddev
->max_disks
);
1872 bdevname(rdev
->bdev
,b
);
1873 while ( (s
=strchr(b
, '/')) != NULL
)
1876 rdev
->mddev
= mddev
;
1877 printk(KERN_INFO
"md: bind<%s>\n", b
);
1879 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1882 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1883 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1884 /* failure here is OK */;
1885 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1887 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1888 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1890 /* May as well allow recovery to be retried once */
1891 mddev
->recovery_disabled
= 0;
1896 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1901 static void md_delayed_delete(struct work_struct
*ws
)
1903 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1904 kobject_del(&rdev
->kobj
);
1905 kobject_put(&rdev
->kobj
);
1908 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1910 char b
[BDEVNAME_SIZE
];
1915 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1916 list_del_rcu(&rdev
->same_set
);
1917 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1919 sysfs_remove_link(&rdev
->kobj
, "block");
1920 sysfs_put(rdev
->sysfs_state
);
1921 rdev
->sysfs_state
= NULL
;
1922 /* We need to delay this, otherwise we can deadlock when
1923 * writing to 'remove' to "dev/state". We also need
1924 * to delay it due to rcu usage.
1927 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1928 kobject_get(&rdev
->kobj
);
1929 queue_work(md_misc_wq
, &rdev
->del_work
);
1933 * prevent the device from being mounted, repartitioned or
1934 * otherwise reused by a RAID array (or any other kernel
1935 * subsystem), by bd_claiming the device.
1937 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1940 struct block_device
*bdev
;
1941 char b
[BDEVNAME_SIZE
];
1943 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1945 printk(KERN_ERR
"md: could not open %s.\n",
1946 __bdevname(dev
, b
));
1947 return PTR_ERR(bdev
);
1949 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1951 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1953 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1957 set_bit(AllReserved
, &rdev
->flags
);
1962 static void unlock_rdev(mdk_rdev_t
*rdev
)
1964 struct block_device
*bdev
= rdev
->bdev
;
1969 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1972 void md_autodetect_dev(dev_t dev
);
1974 static void export_rdev(mdk_rdev_t
* rdev
)
1976 char b
[BDEVNAME_SIZE
];
1977 printk(KERN_INFO
"md: export_rdev(%s)\n",
1978 bdevname(rdev
->bdev
,b
));
1983 if (test_bit(AutoDetected
, &rdev
->flags
))
1984 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1987 kobject_put(&rdev
->kobj
);
1990 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1992 unbind_rdev_from_array(rdev
);
1996 static void export_array(mddev_t
*mddev
)
1998 mdk_rdev_t
*rdev
, *tmp
;
2000 rdev_for_each(rdev
, tmp
, mddev
) {
2005 kick_rdev_from_array(rdev
);
2007 if (!list_empty(&mddev
->disks
))
2009 mddev
->raid_disks
= 0;
2010 mddev
->major_version
= 0;
2013 static void print_desc(mdp_disk_t
*desc
)
2015 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2016 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2019 static void print_sb_90(mdp_super_t
*sb
)
2024 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2025 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2026 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2028 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2029 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2030 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2031 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2032 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2033 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2034 sb
->failed_disks
, sb
->spare_disks
,
2035 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2038 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2041 desc
= sb
->disks
+ i
;
2042 if (desc
->number
|| desc
->major
|| desc
->minor
||
2043 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2044 printk(" D %2d: ", i
);
2048 printk(KERN_INFO
"md: THIS: ");
2049 print_desc(&sb
->this_disk
);
2052 static void print_sb_1(struct mdp_superblock_1
*sb
)
2056 uuid
= sb
->set_uuid
;
2058 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2059 "md: Name: \"%s\" CT:%llu\n",
2060 le32_to_cpu(sb
->major_version
),
2061 le32_to_cpu(sb
->feature_map
),
2064 (unsigned long long)le64_to_cpu(sb
->ctime
)
2065 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2067 uuid
= sb
->device_uuid
;
2069 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2071 "md: Dev:%08x UUID: %pU\n"
2072 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2073 "md: (MaxDev:%u) \n",
2074 le32_to_cpu(sb
->level
),
2075 (unsigned long long)le64_to_cpu(sb
->size
),
2076 le32_to_cpu(sb
->raid_disks
),
2077 le32_to_cpu(sb
->layout
),
2078 le32_to_cpu(sb
->chunksize
),
2079 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2080 (unsigned long long)le64_to_cpu(sb
->data_size
),
2081 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2082 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2083 le32_to_cpu(sb
->dev_number
),
2086 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2087 (unsigned long long)le64_to_cpu(sb
->events
),
2088 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2089 le32_to_cpu(sb
->sb_csum
),
2090 le32_to_cpu(sb
->max_dev
)
2094 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2096 char b
[BDEVNAME_SIZE
];
2097 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2098 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2099 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2101 if (rdev
->sb_loaded
) {
2102 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2103 switch (major_version
) {
2105 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2108 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2112 printk(KERN_INFO
"md: no rdev superblock!\n");
2115 static void md_print_devices(void)
2117 struct list_head
*tmp
;
2120 char b
[BDEVNAME_SIZE
];
2123 printk("md: **********************************\n");
2124 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2125 printk("md: **********************************\n");
2126 for_each_mddev(mddev
, tmp
) {
2129 bitmap_print_sb(mddev
->bitmap
);
2131 printk("%s: ", mdname(mddev
));
2132 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2133 printk("<%s>", bdevname(rdev
->bdev
,b
));
2136 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2137 print_rdev(rdev
, mddev
->major_version
);
2139 printk("md: **********************************\n");
2144 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2146 /* Update each superblock (in-memory image), but
2147 * if we are allowed to, skip spares which already
2148 * have the right event counter, or have one earlier
2149 * (which would mean they aren't being marked as dirty
2150 * with the rest of the array)
2153 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2154 if (rdev
->sb_events
== mddev
->events
||
2156 rdev
->raid_disk
< 0 &&
2157 rdev
->sb_events
+1 == mddev
->events
)) {
2158 /* Don't update this superblock */
2159 rdev
->sb_loaded
= 2;
2161 super_types
[mddev
->major_version
].
2162 sync_super(mddev
, rdev
);
2163 rdev
->sb_loaded
= 1;
2168 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2175 /* First make sure individual recovery_offsets are correct */
2176 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2177 if (rdev
->raid_disk
>= 0 &&
2178 mddev
->delta_disks
>= 0 &&
2179 !test_bit(In_sync
, &rdev
->flags
) &&
2180 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2181 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2184 if (!mddev
->persistent
) {
2185 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2186 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2187 if (!mddev
->external
)
2188 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2189 wake_up(&mddev
->sb_wait
);
2193 spin_lock_irq(&mddev
->write_lock
);
2195 mddev
->utime
= get_seconds();
2197 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2199 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2200 /* just a clean<-> dirty transition, possibly leave spares alone,
2201 * though if events isn't the right even/odd, we will have to do
2207 if (mddev
->degraded
)
2208 /* If the array is degraded, then skipping spares is both
2209 * dangerous and fairly pointless.
2210 * Dangerous because a device that was removed from the array
2211 * might have a event_count that still looks up-to-date,
2212 * so it can be re-added without a resync.
2213 * Pointless because if there are any spares to skip,
2214 * then a recovery will happen and soon that array won't
2215 * be degraded any more and the spare can go back to sleep then.
2219 sync_req
= mddev
->in_sync
;
2221 /* If this is just a dirty<->clean transition, and the array is clean
2222 * and 'events' is odd, we can roll back to the previous clean state */
2224 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2225 && mddev
->can_decrease_events
2226 && mddev
->events
!= 1) {
2228 mddev
->can_decrease_events
= 0;
2230 /* otherwise we have to go forward and ... */
2232 mddev
->can_decrease_events
= nospares
;
2235 if (!mddev
->events
) {
2237 * oops, this 64-bit counter should never wrap.
2238 * Either we are in around ~1 trillion A.C., assuming
2239 * 1 reboot per second, or we have a bug:
2244 sync_sbs(mddev
, nospares
);
2245 spin_unlock_irq(&mddev
->write_lock
);
2248 "md: updating %s RAID superblock on device (in sync %d)\n",
2249 mdname(mddev
),mddev
->in_sync
);
2251 bitmap_update_sb(mddev
->bitmap
);
2252 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2253 char b
[BDEVNAME_SIZE
];
2254 dprintk(KERN_INFO
"md: ");
2255 if (rdev
->sb_loaded
!= 1)
2256 continue; /* no noise on spare devices */
2257 if (test_bit(Faulty
, &rdev
->flags
))
2258 dprintk("(skipping faulty ");
2260 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2261 if (!test_bit(Faulty
, &rdev
->flags
)) {
2262 md_super_write(mddev
,rdev
,
2263 rdev
->sb_start
, rdev
->sb_size
,
2265 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2266 bdevname(rdev
->bdev
,b
),
2267 (unsigned long long)rdev
->sb_start
);
2268 rdev
->sb_events
= mddev
->events
;
2272 if (mddev
->level
== LEVEL_MULTIPATH
)
2273 /* only need to write one superblock... */
2276 md_super_wait(mddev
);
2277 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2279 spin_lock_irq(&mddev
->write_lock
);
2280 if (mddev
->in_sync
!= sync_req
||
2281 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2282 /* have to write it out again */
2283 spin_unlock_irq(&mddev
->write_lock
);
2286 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2287 spin_unlock_irq(&mddev
->write_lock
);
2288 wake_up(&mddev
->sb_wait
);
2289 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2290 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2294 /* words written to sysfs files may, or may not, be \n terminated.
2295 * We want to accept with case. For this we use cmd_match.
2297 static int cmd_match(const char *cmd
, const char *str
)
2299 /* See if cmd, written into a sysfs file, matches
2300 * str. They must either be the same, or cmd can
2301 * have a trailing newline
2303 while (*cmd
&& *str
&& *cmd
== *str
) {
2314 struct rdev_sysfs_entry
{
2315 struct attribute attr
;
2316 ssize_t (*show
)(mdk_rdev_t
*, char *);
2317 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2321 state_show(mdk_rdev_t
*rdev
, char *page
)
2326 if (test_bit(Faulty
, &rdev
->flags
)) {
2327 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2330 if (test_bit(In_sync
, &rdev
->flags
)) {
2331 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2334 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2335 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2338 if (test_bit(Blocked
, &rdev
->flags
)) {
2339 len
+= sprintf(page
+len
, "%sblocked", sep
);
2342 if (!test_bit(Faulty
, &rdev
->flags
) &&
2343 !test_bit(In_sync
, &rdev
->flags
)) {
2344 len
+= sprintf(page
+len
, "%sspare", sep
);
2347 return len
+sprintf(page
+len
, "\n");
2351 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2354 * faulty - simulates and error
2355 * remove - disconnects the device
2356 * writemostly - sets write_mostly
2357 * -writemostly - clears write_mostly
2358 * blocked - sets the Blocked flag
2359 * -blocked - clears the Blocked flag
2360 * insync - sets Insync providing device isn't active
2363 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2364 md_error(rdev
->mddev
, rdev
);
2366 } else if (cmd_match(buf
, "remove")) {
2367 if (rdev
->raid_disk
>= 0)
2370 mddev_t
*mddev
= rdev
->mddev
;
2371 kick_rdev_from_array(rdev
);
2373 md_update_sb(mddev
, 1);
2374 md_new_event(mddev
);
2377 } else if (cmd_match(buf
, "writemostly")) {
2378 set_bit(WriteMostly
, &rdev
->flags
);
2380 } else if (cmd_match(buf
, "-writemostly")) {
2381 clear_bit(WriteMostly
, &rdev
->flags
);
2383 } else if (cmd_match(buf
, "blocked")) {
2384 set_bit(Blocked
, &rdev
->flags
);
2386 } else if (cmd_match(buf
, "-blocked")) {
2387 clear_bit(Blocked
, &rdev
->flags
);
2388 wake_up(&rdev
->blocked_wait
);
2389 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2390 md_wakeup_thread(rdev
->mddev
->thread
);
2393 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2394 set_bit(In_sync
, &rdev
->flags
);
2398 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2399 return err
? err
: len
;
2401 static struct rdev_sysfs_entry rdev_state
=
2402 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2405 errors_show(mdk_rdev_t
*rdev
, char *page
)
2407 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2411 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2414 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2415 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2416 atomic_set(&rdev
->corrected_errors
, n
);
2421 static struct rdev_sysfs_entry rdev_errors
=
2422 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2425 slot_show(mdk_rdev_t
*rdev
, char *page
)
2427 if (rdev
->raid_disk
< 0)
2428 return sprintf(page
, "none\n");
2430 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2434 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2439 int slot
= simple_strtoul(buf
, &e
, 10);
2440 if (strncmp(buf
, "none", 4)==0)
2442 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2444 if (rdev
->mddev
->pers
&& slot
== -1) {
2445 /* Setting 'slot' on an active array requires also
2446 * updating the 'rd%d' link, and communicating
2447 * with the personality with ->hot_*_disk.
2448 * For now we only support removing
2449 * failed/spare devices. This normally happens automatically,
2450 * but not when the metadata is externally managed.
2452 if (rdev
->raid_disk
== -1)
2454 /* personality does all needed checks */
2455 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2457 err
= rdev
->mddev
->pers
->
2458 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2461 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2462 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2463 rdev
->raid_disk
= -1;
2464 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2465 md_wakeup_thread(rdev
->mddev
->thread
);
2466 } else if (rdev
->mddev
->pers
) {
2468 /* Activating a spare .. or possibly reactivating
2469 * if we ever get bitmaps working here.
2472 if (rdev
->raid_disk
!= -1)
2475 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2478 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2479 if (rdev2
->raid_disk
== slot
)
2482 rdev
->raid_disk
= slot
;
2483 if (test_bit(In_sync
, &rdev
->flags
))
2484 rdev
->saved_raid_disk
= slot
;
2486 rdev
->saved_raid_disk
= -1;
2487 err
= rdev
->mddev
->pers
->
2488 hot_add_disk(rdev
->mddev
, rdev
);
2490 rdev
->raid_disk
= -1;
2493 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2494 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2495 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2496 /* failure here is OK */;
2497 /* don't wakeup anyone, leave that to userspace. */
2499 if (slot
>= rdev
->mddev
->raid_disks
)
2501 rdev
->raid_disk
= slot
;
2502 /* assume it is working */
2503 clear_bit(Faulty
, &rdev
->flags
);
2504 clear_bit(WriteMostly
, &rdev
->flags
);
2505 set_bit(In_sync
, &rdev
->flags
);
2506 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2512 static struct rdev_sysfs_entry rdev_slot
=
2513 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2516 offset_show(mdk_rdev_t
*rdev
, char *page
)
2518 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2522 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2525 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2526 if (e
==buf
|| (*e
&& *e
!= '\n'))
2528 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2530 if (rdev
->sectors
&& rdev
->mddev
->external
)
2531 /* Must set offset before size, so overlap checks
2534 rdev
->data_offset
= offset
;
2538 static struct rdev_sysfs_entry rdev_offset
=
2539 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2542 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2544 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2547 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2549 /* check if two start/length pairs overlap */
2557 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2559 unsigned long long blocks
;
2562 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2565 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2566 return -EINVAL
; /* sector conversion overflow */
2569 if (new != blocks
* 2)
2570 return -EINVAL
; /* unsigned long long to sector_t overflow */
2577 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2579 mddev_t
*my_mddev
= rdev
->mddev
;
2580 sector_t oldsectors
= rdev
->sectors
;
2583 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2585 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2586 if (my_mddev
->persistent
) {
2587 sectors
= super_types
[my_mddev
->major_version
].
2588 rdev_size_change(rdev
, sectors
);
2591 } else if (!sectors
)
2592 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2595 if (sectors
< my_mddev
->dev_sectors
)
2596 return -EINVAL
; /* component must fit device */
2598 rdev
->sectors
= sectors
;
2599 if (sectors
> oldsectors
&& my_mddev
->external
) {
2600 /* need to check that all other rdevs with the same ->bdev
2601 * do not overlap. We need to unlock the mddev to avoid
2602 * a deadlock. We have already changed rdev->sectors, and if
2603 * we have to change it back, we will have the lock again.
2607 struct list_head
*tmp
;
2609 mddev_unlock(my_mddev
);
2610 for_each_mddev(mddev
, tmp
) {
2614 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2615 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2616 (rdev
->bdev
== rdev2
->bdev
&&
2618 overlaps(rdev
->data_offset
, rdev
->sectors
,
2624 mddev_unlock(mddev
);
2630 mddev_lock(my_mddev
);
2632 /* Someone else could have slipped in a size
2633 * change here, but doing so is just silly.
2634 * We put oldsectors back because we *know* it is
2635 * safe, and trust userspace not to race with
2638 rdev
->sectors
= oldsectors
;
2645 static struct rdev_sysfs_entry rdev_size
=
2646 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2649 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2651 unsigned long long recovery_start
= rdev
->recovery_offset
;
2653 if (test_bit(In_sync
, &rdev
->flags
) ||
2654 recovery_start
== MaxSector
)
2655 return sprintf(page
, "none\n");
2657 return sprintf(page
, "%llu\n", recovery_start
);
2660 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2662 unsigned long long recovery_start
;
2664 if (cmd_match(buf
, "none"))
2665 recovery_start
= MaxSector
;
2666 else if (strict_strtoull(buf
, 10, &recovery_start
))
2669 if (rdev
->mddev
->pers
&&
2670 rdev
->raid_disk
>= 0)
2673 rdev
->recovery_offset
= recovery_start
;
2674 if (recovery_start
== MaxSector
)
2675 set_bit(In_sync
, &rdev
->flags
);
2677 clear_bit(In_sync
, &rdev
->flags
);
2681 static struct rdev_sysfs_entry rdev_recovery_start
=
2682 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2684 static struct attribute
*rdev_default_attrs
[] = {
2690 &rdev_recovery_start
.attr
,
2694 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2696 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2697 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2698 mddev_t
*mddev
= rdev
->mddev
;
2704 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2706 if (rdev
->mddev
== NULL
)
2709 rv
= entry
->show(rdev
, page
);
2710 mddev_unlock(mddev
);
2716 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2717 const char *page
, size_t length
)
2719 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2720 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2722 mddev_t
*mddev
= rdev
->mddev
;
2726 if (!capable(CAP_SYS_ADMIN
))
2728 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2730 if (rdev
->mddev
== NULL
)
2733 rv
= entry
->store(rdev
, page
, length
);
2734 mddev_unlock(mddev
);
2739 static void rdev_free(struct kobject
*ko
)
2741 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2744 static const struct sysfs_ops rdev_sysfs_ops
= {
2745 .show
= rdev_attr_show
,
2746 .store
= rdev_attr_store
,
2748 static struct kobj_type rdev_ktype
= {
2749 .release
= rdev_free
,
2750 .sysfs_ops
= &rdev_sysfs_ops
,
2751 .default_attrs
= rdev_default_attrs
,
2754 void md_rdev_init(mdk_rdev_t
*rdev
)
2757 rdev
->saved_raid_disk
= -1;
2758 rdev
->raid_disk
= -1;
2760 rdev
->data_offset
= 0;
2761 rdev
->sb_events
= 0;
2762 rdev
->last_read_error
.tv_sec
= 0;
2763 rdev
->last_read_error
.tv_nsec
= 0;
2764 atomic_set(&rdev
->nr_pending
, 0);
2765 atomic_set(&rdev
->read_errors
, 0);
2766 atomic_set(&rdev
->corrected_errors
, 0);
2768 INIT_LIST_HEAD(&rdev
->same_set
);
2769 init_waitqueue_head(&rdev
->blocked_wait
);
2771 EXPORT_SYMBOL_GPL(md_rdev_init
);
2773 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2775 * mark the device faulty if:
2777 * - the device is nonexistent (zero size)
2778 * - the device has no valid superblock
2780 * a faulty rdev _never_ has rdev->sb set.
2782 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2784 char b
[BDEVNAME_SIZE
];
2789 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2791 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2792 return ERR_PTR(-ENOMEM
);
2796 if ((err
= alloc_disk_sb(rdev
)))
2799 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2803 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2805 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
2808 "md: %s has zero or unknown size, marking faulty!\n",
2809 bdevname(rdev
->bdev
,b
));
2814 if (super_format
>= 0) {
2815 err
= super_types
[super_format
].
2816 load_super(rdev
, NULL
, super_minor
);
2817 if (err
== -EINVAL
) {
2819 "md: %s does not have a valid v%d.%d "
2820 "superblock, not importing!\n",
2821 bdevname(rdev
->bdev
,b
),
2822 super_format
, super_minor
);
2827 "md: could not read %s's sb, not importing!\n",
2828 bdevname(rdev
->bdev
,b
));
2836 if (rdev
->sb_page
) {
2842 return ERR_PTR(err
);
2846 * Check a full RAID array for plausibility
2850 static void analyze_sbs(mddev_t
* mddev
)
2853 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2854 char b
[BDEVNAME_SIZE
];
2857 rdev_for_each(rdev
, tmp
, mddev
)
2858 switch (super_types
[mddev
->major_version
].
2859 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2867 "md: fatal superblock inconsistency in %s"
2868 " -- removing from array\n",
2869 bdevname(rdev
->bdev
,b
));
2870 kick_rdev_from_array(rdev
);
2874 super_types
[mddev
->major_version
].
2875 validate_super(mddev
, freshest
);
2878 rdev_for_each(rdev
, tmp
, mddev
) {
2879 if (mddev
->max_disks
&&
2880 (rdev
->desc_nr
>= mddev
->max_disks
||
2881 i
> mddev
->max_disks
)) {
2883 "md: %s: %s: only %d devices permitted\n",
2884 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2886 kick_rdev_from_array(rdev
);
2889 if (rdev
!= freshest
)
2890 if (super_types
[mddev
->major_version
].
2891 validate_super(mddev
, rdev
)) {
2892 printk(KERN_WARNING
"md: kicking non-fresh %s"
2894 bdevname(rdev
->bdev
,b
));
2895 kick_rdev_from_array(rdev
);
2898 if (mddev
->level
== LEVEL_MULTIPATH
) {
2899 rdev
->desc_nr
= i
++;
2900 rdev
->raid_disk
= rdev
->desc_nr
;
2901 set_bit(In_sync
, &rdev
->flags
);
2902 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2903 rdev
->raid_disk
= -1;
2904 clear_bit(In_sync
, &rdev
->flags
);
2909 /* Read a fixed-point number.
2910 * Numbers in sysfs attributes should be in "standard" units where
2911 * possible, so time should be in seconds.
2912 * However we internally use a a much smaller unit such as
2913 * milliseconds or jiffies.
2914 * This function takes a decimal number with a possible fractional
2915 * component, and produces an integer which is the result of
2916 * multiplying that number by 10^'scale'.
2917 * all without any floating-point arithmetic.
2919 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2921 unsigned long result
= 0;
2923 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2926 else if (decimals
< scale
) {
2929 result
= result
* 10 + value
;
2941 while (decimals
< scale
) {
2950 static void md_safemode_timeout(unsigned long data
);
2953 safe_delay_show(mddev_t
*mddev
, char *page
)
2955 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2956 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2959 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2963 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2966 mddev
->safemode_delay
= 0;
2968 unsigned long old_delay
= mddev
->safemode_delay
;
2969 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2970 if (mddev
->safemode_delay
== 0)
2971 mddev
->safemode_delay
= 1;
2972 if (mddev
->safemode_delay
< old_delay
)
2973 md_safemode_timeout((unsigned long)mddev
);
2977 static struct md_sysfs_entry md_safe_delay
=
2978 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2981 level_show(mddev_t
*mddev
, char *page
)
2983 struct mdk_personality
*p
= mddev
->pers
;
2985 return sprintf(page
, "%s\n", p
->name
);
2986 else if (mddev
->clevel
[0])
2987 return sprintf(page
, "%s\n", mddev
->clevel
);
2988 else if (mddev
->level
!= LEVEL_NONE
)
2989 return sprintf(page
, "%d\n", mddev
->level
);
2995 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2999 struct mdk_personality
*pers
;
3004 if (mddev
->pers
== NULL
) {
3007 if (len
>= sizeof(mddev
->clevel
))
3009 strncpy(mddev
->clevel
, buf
, len
);
3010 if (mddev
->clevel
[len
-1] == '\n')
3012 mddev
->clevel
[len
] = 0;
3013 mddev
->level
= LEVEL_NONE
;
3017 /* request to change the personality. Need to ensure:
3018 * - array is not engaged in resync/recovery/reshape
3019 * - old personality can be suspended
3020 * - new personality will access other array.
3023 if (mddev
->sync_thread
||
3024 mddev
->reshape_position
!= MaxSector
||
3025 mddev
->sysfs_active
)
3028 if (!mddev
->pers
->quiesce
) {
3029 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3030 mdname(mddev
), mddev
->pers
->name
);
3034 /* Now find the new personality */
3035 if (len
== 0 || len
>= sizeof(clevel
))
3037 strncpy(clevel
, buf
, len
);
3038 if (clevel
[len
-1] == '\n')
3041 if (strict_strtol(clevel
, 10, &level
))
3044 if (request_module("md-%s", clevel
) != 0)
3045 request_module("md-level-%s", clevel
);
3046 spin_lock(&pers_lock
);
3047 pers
= find_pers(level
, clevel
);
3048 if (!pers
|| !try_module_get(pers
->owner
)) {
3049 spin_unlock(&pers_lock
);
3050 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3053 spin_unlock(&pers_lock
);
3055 if (pers
== mddev
->pers
) {
3056 /* Nothing to do! */
3057 module_put(pers
->owner
);
3060 if (!pers
->takeover
) {
3061 module_put(pers
->owner
);
3062 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3063 mdname(mddev
), clevel
);
3067 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3068 rdev
->new_raid_disk
= rdev
->raid_disk
;
3070 /* ->takeover must set new_* and/or delta_disks
3071 * if it succeeds, and may set them when it fails.
3073 priv
= pers
->takeover(mddev
);
3075 mddev
->new_level
= mddev
->level
;
3076 mddev
->new_layout
= mddev
->layout
;
3077 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3078 mddev
->raid_disks
-= mddev
->delta_disks
;
3079 mddev
->delta_disks
= 0;
3080 module_put(pers
->owner
);
3081 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3082 mdname(mddev
), clevel
);
3083 return PTR_ERR(priv
);
3086 /* Looks like we have a winner */
3087 mddev_suspend(mddev
);
3088 mddev
->pers
->stop(mddev
);
3090 if (mddev
->pers
->sync_request
== NULL
&&
3091 pers
->sync_request
!= NULL
) {
3092 /* need to add the md_redundancy_group */
3093 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3095 "md: cannot register extra attributes for %s\n",
3097 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3099 if (mddev
->pers
->sync_request
!= NULL
&&
3100 pers
->sync_request
== NULL
) {
3101 /* need to remove the md_redundancy_group */
3102 if (mddev
->to_remove
== NULL
)
3103 mddev
->to_remove
= &md_redundancy_group
;
3106 if (mddev
->pers
->sync_request
== NULL
&&
3108 /* We are converting from a no-redundancy array
3109 * to a redundancy array and metadata is managed
3110 * externally so we need to be sure that writes
3111 * won't block due to a need to transition
3113 * until external management is started.
3116 mddev
->safemode_delay
= 0;
3117 mddev
->safemode
= 0;
3120 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3122 if (rdev
->raid_disk
< 0)
3124 if (rdev
->new_raid_disk
> mddev
->raid_disks
)
3125 rdev
->new_raid_disk
= -1;
3126 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3128 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3129 sysfs_remove_link(&mddev
->kobj
, nm
);
3131 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3132 if (rdev
->raid_disk
< 0)
3134 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3136 rdev
->raid_disk
= rdev
->new_raid_disk
;
3137 if (rdev
->raid_disk
< 0)
3138 clear_bit(In_sync
, &rdev
->flags
);
3141 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3142 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3143 printk("md: cannot register %s for %s after level change\n",
3148 module_put(mddev
->pers
->owner
);
3150 mddev
->private = priv
;
3151 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3152 mddev
->level
= mddev
->new_level
;
3153 mddev
->layout
= mddev
->new_layout
;
3154 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3155 mddev
->delta_disks
= 0;
3156 if (mddev
->pers
->sync_request
== NULL
) {
3157 /* this is now an array without redundancy, so
3158 * it must always be in_sync
3161 del_timer_sync(&mddev
->safemode_timer
);
3164 mddev_resume(mddev
);
3165 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3166 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3167 md_wakeup_thread(mddev
->thread
);
3168 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3169 md_new_event(mddev
);
3173 static struct md_sysfs_entry md_level
=
3174 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3178 layout_show(mddev_t
*mddev
, char *page
)
3180 /* just a number, not meaningful for all levels */
3181 if (mddev
->reshape_position
!= MaxSector
&&
3182 mddev
->layout
!= mddev
->new_layout
)
3183 return sprintf(page
, "%d (%d)\n",
3184 mddev
->new_layout
, mddev
->layout
);
3185 return sprintf(page
, "%d\n", mddev
->layout
);
3189 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3192 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3194 if (!*buf
|| (*e
&& *e
!= '\n'))
3199 if (mddev
->pers
->check_reshape
== NULL
)
3201 mddev
->new_layout
= n
;
3202 err
= mddev
->pers
->check_reshape(mddev
);
3204 mddev
->new_layout
= mddev
->layout
;
3208 mddev
->new_layout
= n
;
3209 if (mddev
->reshape_position
== MaxSector
)
3214 static struct md_sysfs_entry md_layout
=
3215 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3219 raid_disks_show(mddev_t
*mddev
, char *page
)
3221 if (mddev
->raid_disks
== 0)
3223 if (mddev
->reshape_position
!= MaxSector
&&
3224 mddev
->delta_disks
!= 0)
3225 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3226 mddev
->raid_disks
- mddev
->delta_disks
);
3227 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3230 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3233 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3237 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3239 if (!*buf
|| (*e
&& *e
!= '\n'))
3243 rv
= update_raid_disks(mddev
, n
);
3244 else if (mddev
->reshape_position
!= MaxSector
) {
3245 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3246 mddev
->delta_disks
= n
- olddisks
;
3247 mddev
->raid_disks
= n
;
3249 mddev
->raid_disks
= n
;
3250 return rv
? rv
: len
;
3252 static struct md_sysfs_entry md_raid_disks
=
3253 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3256 chunk_size_show(mddev_t
*mddev
, char *page
)
3258 if (mddev
->reshape_position
!= MaxSector
&&
3259 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3260 return sprintf(page
, "%d (%d)\n",
3261 mddev
->new_chunk_sectors
<< 9,
3262 mddev
->chunk_sectors
<< 9);
3263 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3267 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3270 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3272 if (!*buf
|| (*e
&& *e
!= '\n'))
3277 if (mddev
->pers
->check_reshape
== NULL
)
3279 mddev
->new_chunk_sectors
= n
>> 9;
3280 err
= mddev
->pers
->check_reshape(mddev
);
3282 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3286 mddev
->new_chunk_sectors
= n
>> 9;
3287 if (mddev
->reshape_position
== MaxSector
)
3288 mddev
->chunk_sectors
= n
>> 9;
3292 static struct md_sysfs_entry md_chunk_size
=
3293 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3296 resync_start_show(mddev_t
*mddev
, char *page
)
3298 if (mddev
->recovery_cp
== MaxSector
)
3299 return sprintf(page
, "none\n");
3300 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3304 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3307 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3311 if (cmd_match(buf
, "none"))
3313 else if (!*buf
|| (*e
&& *e
!= '\n'))
3316 mddev
->recovery_cp
= n
;
3319 static struct md_sysfs_entry md_resync_start
=
3320 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3323 * The array state can be:
3326 * No devices, no size, no level
3327 * Equivalent to STOP_ARRAY ioctl
3329 * May have some settings, but array is not active
3330 * all IO results in error
3331 * When written, doesn't tear down array, but just stops it
3332 * suspended (not supported yet)
3333 * All IO requests will block. The array can be reconfigured.
3334 * Writing this, if accepted, will block until array is quiescent
3336 * no resync can happen. no superblocks get written.
3337 * write requests fail
3339 * like readonly, but behaves like 'clean' on a write request.
3341 * clean - no pending writes, but otherwise active.
3342 * When written to inactive array, starts without resync
3343 * If a write request arrives then
3344 * if metadata is known, mark 'dirty' and switch to 'active'.
3345 * if not known, block and switch to write-pending
3346 * If written to an active array that has pending writes, then fails.
3348 * fully active: IO and resync can be happening.
3349 * When written to inactive array, starts with resync
3352 * clean, but writes are blocked waiting for 'active' to be written.
3355 * like active, but no writes have been seen for a while (100msec).
3358 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3359 write_pending
, active_idle
, bad_word
};
3360 static char *array_states
[] = {
3361 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3362 "write-pending", "active-idle", NULL
};
3364 static int match_word(const char *word
, char **list
)
3367 for (n
=0; list
[n
]; n
++)
3368 if (cmd_match(word
, list
[n
]))
3374 array_state_show(mddev_t
*mddev
, char *page
)
3376 enum array_state st
= inactive
;
3389 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3391 else if (mddev
->safemode
)
3397 if (list_empty(&mddev
->disks
) &&
3398 mddev
->raid_disks
== 0 &&
3399 mddev
->dev_sectors
== 0)
3404 return sprintf(page
, "%s\n", array_states
[st
]);
3407 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3408 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3409 static int do_md_run(mddev_t
* mddev
);
3410 static int restart_array(mddev_t
*mddev
);
3413 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3416 enum array_state st
= match_word(buf
, array_states
);
3421 /* stopping an active array */
3422 if (atomic_read(&mddev
->openers
) > 0)
3424 err
= do_md_stop(mddev
, 0, 0);
3427 /* stopping an active array */
3429 if (atomic_read(&mddev
->openers
) > 0)
3431 err
= do_md_stop(mddev
, 2, 0);
3433 err
= 0; /* already inactive */
3436 break; /* not supported yet */
3439 err
= md_set_readonly(mddev
, 0);
3442 set_disk_ro(mddev
->gendisk
, 1);
3443 err
= do_md_run(mddev
);
3449 err
= md_set_readonly(mddev
, 0);
3450 else if (mddev
->ro
== 1)
3451 err
= restart_array(mddev
);
3454 set_disk_ro(mddev
->gendisk
, 0);
3458 err
= do_md_run(mddev
);
3463 restart_array(mddev
);
3464 spin_lock_irq(&mddev
->write_lock
);
3465 if (atomic_read(&mddev
->writes_pending
) == 0) {
3466 if (mddev
->in_sync
== 0) {
3468 if (mddev
->safemode
== 1)
3469 mddev
->safemode
= 0;
3470 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3475 spin_unlock_irq(&mddev
->write_lock
);
3481 restart_array(mddev
);
3482 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3483 wake_up(&mddev
->sb_wait
);
3487 set_disk_ro(mddev
->gendisk
, 0);
3488 err
= do_md_run(mddev
);
3493 /* these cannot be set */
3499 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3503 static struct md_sysfs_entry md_array_state
=
3504 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3507 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3508 return sprintf(page
, "%d\n",
3509 atomic_read(&mddev
->max_corr_read_errors
));
3513 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3516 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3518 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3519 atomic_set(&mddev
->max_corr_read_errors
, n
);
3525 static struct md_sysfs_entry max_corr_read_errors
=
3526 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3527 max_corrected_read_errors_store
);
3530 null_show(mddev_t
*mddev
, char *page
)
3536 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3538 /* buf must be %d:%d\n? giving major and minor numbers */
3539 /* The new device is added to the array.
3540 * If the array has a persistent superblock, we read the
3541 * superblock to initialise info and check validity.
3542 * Otherwise, only checking done is that in bind_rdev_to_array,
3543 * which mainly checks size.
3546 int major
= simple_strtoul(buf
, &e
, 10);
3552 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3554 minor
= simple_strtoul(e
+1, &e
, 10);
3555 if (*e
&& *e
!= '\n')
3557 dev
= MKDEV(major
, minor
);
3558 if (major
!= MAJOR(dev
) ||
3559 minor
!= MINOR(dev
))
3563 if (mddev
->persistent
) {
3564 rdev
= md_import_device(dev
, mddev
->major_version
,
3565 mddev
->minor_version
);
3566 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3567 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3568 mdk_rdev_t
, same_set
);
3569 err
= super_types
[mddev
->major_version
]
3570 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3574 } else if (mddev
->external
)
3575 rdev
= md_import_device(dev
, -2, -1);
3577 rdev
= md_import_device(dev
, -1, -1);
3580 return PTR_ERR(rdev
);
3581 err
= bind_rdev_to_array(rdev
, mddev
);
3585 return err
? err
: len
;
3588 static struct md_sysfs_entry md_new_device
=
3589 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3592 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3595 unsigned long chunk
, end_chunk
;
3599 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3601 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3602 if (buf
== end
) break;
3603 if (*end
== '-') { /* range */
3605 end_chunk
= simple_strtoul(buf
, &end
, 0);
3606 if (buf
== end
) break;
3608 if (*end
&& !isspace(*end
)) break;
3609 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3610 buf
= skip_spaces(end
);
3612 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3617 static struct md_sysfs_entry md_bitmap
=
3618 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3621 size_show(mddev_t
*mddev
, char *page
)
3623 return sprintf(page
, "%llu\n",
3624 (unsigned long long)mddev
->dev_sectors
/ 2);
3627 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3630 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3632 /* If array is inactive, we can reduce the component size, but
3633 * not increase it (except from 0).
3634 * If array is active, we can try an on-line resize
3637 int err
= strict_blocks_to_sectors(buf
, §ors
);
3642 err
= update_size(mddev
, sectors
);
3643 md_update_sb(mddev
, 1);
3645 if (mddev
->dev_sectors
== 0 ||
3646 mddev
->dev_sectors
> sectors
)
3647 mddev
->dev_sectors
= sectors
;
3651 return err
? err
: len
;
3654 static struct md_sysfs_entry md_size
=
3655 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3660 * 'none' for arrays with no metadata (good luck...)
3661 * 'external' for arrays with externally managed metadata,
3662 * or N.M for internally known formats
3665 metadata_show(mddev_t
*mddev
, char *page
)
3667 if (mddev
->persistent
)
3668 return sprintf(page
, "%d.%d\n",
3669 mddev
->major_version
, mddev
->minor_version
);
3670 else if (mddev
->external
)
3671 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3673 return sprintf(page
, "none\n");
3677 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3681 /* Changing the details of 'external' metadata is
3682 * always permitted. Otherwise there must be
3683 * no devices attached to the array.
3685 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3687 else if (!list_empty(&mddev
->disks
))
3690 if (cmd_match(buf
, "none")) {
3691 mddev
->persistent
= 0;
3692 mddev
->external
= 0;
3693 mddev
->major_version
= 0;
3694 mddev
->minor_version
= 90;
3697 if (strncmp(buf
, "external:", 9) == 0) {
3698 size_t namelen
= len
-9;
3699 if (namelen
>= sizeof(mddev
->metadata_type
))
3700 namelen
= sizeof(mddev
->metadata_type
)-1;
3701 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3702 mddev
->metadata_type
[namelen
] = 0;
3703 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3704 mddev
->metadata_type
[--namelen
] = 0;
3705 mddev
->persistent
= 0;
3706 mddev
->external
= 1;
3707 mddev
->major_version
= 0;
3708 mddev
->minor_version
= 90;
3711 major
= simple_strtoul(buf
, &e
, 10);
3712 if (e
==buf
|| *e
!= '.')
3715 minor
= simple_strtoul(buf
, &e
, 10);
3716 if (e
==buf
|| (*e
&& *e
!= '\n') )
3718 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3720 mddev
->major_version
= major
;
3721 mddev
->minor_version
= minor
;
3722 mddev
->persistent
= 1;
3723 mddev
->external
= 0;
3727 static struct md_sysfs_entry md_metadata
=
3728 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3731 action_show(mddev_t
*mddev
, char *page
)
3733 char *type
= "idle";
3734 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3736 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3737 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3738 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3740 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3741 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3743 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3747 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3750 return sprintf(page
, "%s\n", type
);
3753 static void reap_sync_thread(mddev_t
*mddev
);
3756 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3758 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3761 if (cmd_match(page
, "frozen"))
3762 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3764 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3766 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3767 if (mddev
->sync_thread
) {
3768 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3769 reap_sync_thread(mddev
);
3771 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3772 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3774 else if (cmd_match(page
, "resync"))
3775 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3776 else if (cmd_match(page
, "recover")) {
3777 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3778 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3779 } else if (cmd_match(page
, "reshape")) {
3781 if (mddev
->pers
->start_reshape
== NULL
)
3783 err
= mddev
->pers
->start_reshape(mddev
);
3786 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3788 if (cmd_match(page
, "check"))
3789 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3790 else if (!cmd_match(page
, "repair"))
3792 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3793 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3795 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3796 md_wakeup_thread(mddev
->thread
);
3797 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3802 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3804 return sprintf(page
, "%llu\n",
3805 (unsigned long long) mddev
->resync_mismatches
);
3808 static struct md_sysfs_entry md_scan_mode
=
3809 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3812 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3815 sync_min_show(mddev_t
*mddev
, char *page
)
3817 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3818 mddev
->sync_speed_min
? "local": "system");
3822 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3826 if (strncmp(buf
, "system", 6)==0) {
3827 mddev
->sync_speed_min
= 0;
3830 min
= simple_strtoul(buf
, &e
, 10);
3831 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3833 mddev
->sync_speed_min
= min
;
3837 static struct md_sysfs_entry md_sync_min
=
3838 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3841 sync_max_show(mddev_t
*mddev
, char *page
)
3843 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3844 mddev
->sync_speed_max
? "local": "system");
3848 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3852 if (strncmp(buf
, "system", 6)==0) {
3853 mddev
->sync_speed_max
= 0;
3856 max
= simple_strtoul(buf
, &e
, 10);
3857 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3859 mddev
->sync_speed_max
= max
;
3863 static struct md_sysfs_entry md_sync_max
=
3864 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3867 degraded_show(mddev_t
*mddev
, char *page
)
3869 return sprintf(page
, "%d\n", mddev
->degraded
);
3871 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3874 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3876 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3880 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3884 if (strict_strtol(buf
, 10, &n
))
3887 if (n
!= 0 && n
!= 1)
3890 mddev
->parallel_resync
= n
;
3892 if (mddev
->sync_thread
)
3893 wake_up(&resync_wait
);
3898 /* force parallel resync, even with shared block devices */
3899 static struct md_sysfs_entry md_sync_force_parallel
=
3900 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3901 sync_force_parallel_show
, sync_force_parallel_store
);
3904 sync_speed_show(mddev_t
*mddev
, char *page
)
3906 unsigned long resync
, dt
, db
;
3907 if (mddev
->curr_resync
== 0)
3908 return sprintf(page
, "none\n");
3909 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3910 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3912 db
= resync
- mddev
->resync_mark_cnt
;
3913 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3916 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3919 sync_completed_show(mddev_t
*mddev
, char *page
)
3921 unsigned long max_sectors
, resync
;
3923 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3924 return sprintf(page
, "none\n");
3926 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3927 max_sectors
= mddev
->resync_max_sectors
;
3929 max_sectors
= mddev
->dev_sectors
;
3931 resync
= mddev
->curr_resync_completed
;
3932 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3935 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3938 min_sync_show(mddev_t
*mddev
, char *page
)
3940 return sprintf(page
, "%llu\n",
3941 (unsigned long long)mddev
->resync_min
);
3944 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3946 unsigned long long min
;
3947 if (strict_strtoull(buf
, 10, &min
))
3949 if (min
> mddev
->resync_max
)
3951 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3954 /* Must be a multiple of chunk_size */
3955 if (mddev
->chunk_sectors
) {
3956 sector_t temp
= min
;
3957 if (sector_div(temp
, mddev
->chunk_sectors
))
3960 mddev
->resync_min
= min
;
3965 static struct md_sysfs_entry md_min_sync
=
3966 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3969 max_sync_show(mddev_t
*mddev
, char *page
)
3971 if (mddev
->resync_max
== MaxSector
)
3972 return sprintf(page
, "max\n");
3974 return sprintf(page
, "%llu\n",
3975 (unsigned long long)mddev
->resync_max
);
3978 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3980 if (strncmp(buf
, "max", 3) == 0)
3981 mddev
->resync_max
= MaxSector
;
3983 unsigned long long max
;
3984 if (strict_strtoull(buf
, 10, &max
))
3986 if (max
< mddev
->resync_min
)
3988 if (max
< mddev
->resync_max
&&
3990 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3993 /* Must be a multiple of chunk_size */
3994 if (mddev
->chunk_sectors
) {
3995 sector_t temp
= max
;
3996 if (sector_div(temp
, mddev
->chunk_sectors
))
3999 mddev
->resync_max
= max
;
4001 wake_up(&mddev
->recovery_wait
);
4005 static struct md_sysfs_entry md_max_sync
=
4006 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4009 suspend_lo_show(mddev_t
*mddev
, char *page
)
4011 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4015 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4018 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4020 if (mddev
->pers
== NULL
||
4021 mddev
->pers
->quiesce
== NULL
)
4023 if (buf
== e
|| (*e
&& *e
!= '\n'))
4025 if (new >= mddev
->suspend_hi
||
4026 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
4027 mddev
->suspend_lo
= new;
4028 mddev
->pers
->quiesce(mddev
, 2);
4033 static struct md_sysfs_entry md_suspend_lo
=
4034 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4038 suspend_hi_show(mddev_t
*mddev
, char *page
)
4040 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4044 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4047 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4049 if (mddev
->pers
== NULL
||
4050 mddev
->pers
->quiesce
== NULL
)
4052 if (buf
== e
|| (*e
&& *e
!= '\n'))
4054 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
4055 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
4056 mddev
->suspend_hi
= new;
4057 mddev
->pers
->quiesce(mddev
, 1);
4058 mddev
->pers
->quiesce(mddev
, 0);
4063 static struct md_sysfs_entry md_suspend_hi
=
4064 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4067 reshape_position_show(mddev_t
*mddev
, char *page
)
4069 if (mddev
->reshape_position
!= MaxSector
)
4070 return sprintf(page
, "%llu\n",
4071 (unsigned long long)mddev
->reshape_position
);
4072 strcpy(page
, "none\n");
4077 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4080 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4083 if (buf
== e
|| (*e
&& *e
!= '\n'))
4085 mddev
->reshape_position
= new;
4086 mddev
->delta_disks
= 0;
4087 mddev
->new_level
= mddev
->level
;
4088 mddev
->new_layout
= mddev
->layout
;
4089 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4093 static struct md_sysfs_entry md_reshape_position
=
4094 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4095 reshape_position_store
);
4098 array_size_show(mddev_t
*mddev
, char *page
)
4100 if (mddev
->external_size
)
4101 return sprintf(page
, "%llu\n",
4102 (unsigned long long)mddev
->array_sectors
/2);
4104 return sprintf(page
, "default\n");
4108 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4112 if (strncmp(buf
, "default", 7) == 0) {
4114 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4116 sectors
= mddev
->array_sectors
;
4118 mddev
->external_size
= 0;
4120 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4122 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4125 mddev
->external_size
= 1;
4128 mddev
->array_sectors
= sectors
;
4129 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4131 revalidate_disk(mddev
->gendisk
);
4136 static struct md_sysfs_entry md_array_size
=
4137 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4140 static struct attribute
*md_default_attrs
[] = {
4143 &md_raid_disks
.attr
,
4144 &md_chunk_size
.attr
,
4146 &md_resync_start
.attr
,
4148 &md_new_device
.attr
,
4149 &md_safe_delay
.attr
,
4150 &md_array_state
.attr
,
4151 &md_reshape_position
.attr
,
4152 &md_array_size
.attr
,
4153 &max_corr_read_errors
.attr
,
4157 static struct attribute
*md_redundancy_attrs
[] = {
4159 &md_mismatches
.attr
,
4162 &md_sync_speed
.attr
,
4163 &md_sync_force_parallel
.attr
,
4164 &md_sync_completed
.attr
,
4167 &md_suspend_lo
.attr
,
4168 &md_suspend_hi
.attr
,
4173 static struct attribute_group md_redundancy_group
= {
4175 .attrs
= md_redundancy_attrs
,
4180 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4182 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4183 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4188 rv
= mddev_lock(mddev
);
4190 rv
= entry
->show(mddev
, page
);
4191 mddev_unlock(mddev
);
4197 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4198 const char *page
, size_t length
)
4200 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4201 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4206 if (!capable(CAP_SYS_ADMIN
))
4208 rv
= mddev_lock(mddev
);
4209 if (mddev
->hold_active
== UNTIL_IOCTL
)
4210 mddev
->hold_active
= 0;
4212 rv
= entry
->store(mddev
, page
, length
);
4213 mddev_unlock(mddev
);
4218 static void md_free(struct kobject
*ko
)
4220 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4222 if (mddev
->sysfs_state
)
4223 sysfs_put(mddev
->sysfs_state
);
4225 if (mddev
->gendisk
) {
4226 del_gendisk(mddev
->gendisk
);
4227 put_disk(mddev
->gendisk
);
4230 blk_cleanup_queue(mddev
->queue
);
4235 static const struct sysfs_ops md_sysfs_ops
= {
4236 .show
= md_attr_show
,
4237 .store
= md_attr_store
,
4239 static struct kobj_type md_ktype
= {
4241 .sysfs_ops
= &md_sysfs_ops
,
4242 .default_attrs
= md_default_attrs
,
4247 static void mddev_delayed_delete(struct work_struct
*ws
)
4249 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4251 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4252 kobject_del(&mddev
->kobj
);
4253 kobject_put(&mddev
->kobj
);
4256 static int md_alloc(dev_t dev
, char *name
)
4258 static DEFINE_MUTEX(disks_mutex
);
4259 mddev_t
*mddev
= mddev_find(dev
);
4260 struct gendisk
*disk
;
4269 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4270 shift
= partitioned
? MdpMinorShift
: 0;
4271 unit
= MINOR(mddev
->unit
) >> shift
;
4273 /* wait for any previous instance of this device to be
4274 * completely removed (mddev_delayed_delete).
4276 flush_workqueue(md_misc_wq
);
4278 mutex_lock(&disks_mutex
);
4284 /* Need to ensure that 'name' is not a duplicate.
4287 spin_lock(&all_mddevs_lock
);
4289 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4290 if (mddev2
->gendisk
&&
4291 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4292 spin_unlock(&all_mddevs_lock
);
4295 spin_unlock(&all_mddevs_lock
);
4299 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4302 mddev
->queue
->queuedata
= mddev
;
4304 blk_queue_make_request(mddev
->queue
, md_make_request
);
4306 disk
= alloc_disk(1 << shift
);
4308 blk_cleanup_queue(mddev
->queue
);
4309 mddev
->queue
= NULL
;
4312 disk
->major
= MAJOR(mddev
->unit
);
4313 disk
->first_minor
= unit
<< shift
;
4315 strcpy(disk
->disk_name
, name
);
4316 else if (partitioned
)
4317 sprintf(disk
->disk_name
, "md_d%d", unit
);
4319 sprintf(disk
->disk_name
, "md%d", unit
);
4320 disk
->fops
= &md_fops
;
4321 disk
->private_data
= mddev
;
4322 disk
->queue
= mddev
->queue
;
4323 /* Allow extended partitions. This makes the
4324 * 'mdp' device redundant, but we can't really
4327 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4329 mddev
->gendisk
= disk
;
4330 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4331 &disk_to_dev(disk
)->kobj
, "%s", "md");
4333 /* This isn't possible, but as kobject_init_and_add is marked
4334 * __must_check, we must do something with the result
4336 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4340 if (mddev
->kobj
.sd
&&
4341 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4342 printk(KERN_DEBUG
"pointless warning\n");
4344 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4346 mutex_unlock(&disks_mutex
);
4347 if (!error
&& mddev
->kobj
.sd
) {
4348 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4349 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4355 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4357 md_alloc(dev
, NULL
);
4361 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4363 /* val must be "md_*" where * is not all digits.
4364 * We allocate an array with a large free minor number, and
4365 * set the name to val. val must not already be an active name.
4367 int len
= strlen(val
);
4368 char buf
[DISK_NAME_LEN
];
4370 while (len
&& val
[len
-1] == '\n')
4372 if (len
>= DISK_NAME_LEN
)
4374 strlcpy(buf
, val
, len
+1);
4375 if (strncmp(buf
, "md_", 3) != 0)
4377 return md_alloc(0, buf
);
4380 static void md_safemode_timeout(unsigned long data
)
4382 mddev_t
*mddev
= (mddev_t
*) data
;
4384 if (!atomic_read(&mddev
->writes_pending
)) {
4385 mddev
->safemode
= 1;
4386 if (mddev
->external
)
4387 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4389 md_wakeup_thread(mddev
->thread
);
4392 static int start_dirty_degraded
;
4394 int md_run(mddev_t
*mddev
)
4398 struct mdk_personality
*pers
;
4400 if (list_empty(&mddev
->disks
))
4401 /* cannot run an array with no devices.. */
4406 /* Cannot run until previous stop completes properly */
4407 if (mddev
->sysfs_active
)
4411 * Analyze all RAID superblock(s)
4413 if (!mddev
->raid_disks
) {
4414 if (!mddev
->persistent
)
4419 if (mddev
->level
!= LEVEL_NONE
)
4420 request_module("md-level-%d", mddev
->level
);
4421 else if (mddev
->clevel
[0])
4422 request_module("md-%s", mddev
->clevel
);
4425 * Drop all container device buffers, from now on
4426 * the only valid external interface is through the md
4429 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4430 if (test_bit(Faulty
, &rdev
->flags
))
4432 sync_blockdev(rdev
->bdev
);
4433 invalidate_bdev(rdev
->bdev
);
4435 /* perform some consistency tests on the device.
4436 * We don't want the data to overlap the metadata,
4437 * Internal Bitmap issues have been handled elsewhere.
4439 if (rdev
->meta_bdev
) {
4440 /* Nothing to check */;
4441 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4442 if (mddev
->dev_sectors
&&
4443 rdev
->data_offset
+ mddev
->dev_sectors
4445 printk("md: %s: data overlaps metadata\n",
4450 if (rdev
->sb_start
+ rdev
->sb_size
/512
4451 > rdev
->data_offset
) {
4452 printk("md: %s: metadata overlaps data\n",
4457 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4460 if (mddev
->bio_set
== NULL
)
4461 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, sizeof(mddev
));
4463 spin_lock(&pers_lock
);
4464 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4465 if (!pers
|| !try_module_get(pers
->owner
)) {
4466 spin_unlock(&pers_lock
);
4467 if (mddev
->level
!= LEVEL_NONE
)
4468 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4471 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4476 spin_unlock(&pers_lock
);
4477 if (mddev
->level
!= pers
->level
) {
4478 mddev
->level
= pers
->level
;
4479 mddev
->new_level
= pers
->level
;
4481 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4483 if (mddev
->reshape_position
!= MaxSector
&&
4484 pers
->start_reshape
== NULL
) {
4485 /* This personality cannot handle reshaping... */
4487 module_put(pers
->owner
);
4491 if (pers
->sync_request
) {
4492 /* Warn if this is a potentially silly
4495 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4499 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4500 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4502 rdev
->bdev
->bd_contains
==
4503 rdev2
->bdev
->bd_contains
) {
4505 "%s: WARNING: %s appears to be"
4506 " on the same physical disk as"
4509 bdevname(rdev
->bdev
,b
),
4510 bdevname(rdev2
->bdev
,b2
));
4517 "True protection against single-disk"
4518 " failure might be compromised.\n");
4521 mddev
->recovery
= 0;
4522 /* may be over-ridden by personality */
4523 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4525 mddev
->ok_start_degraded
= start_dirty_degraded
;
4527 if (start_readonly
&& mddev
->ro
== 0)
4528 mddev
->ro
= 2; /* read-only, but switch on first write */
4530 err
= mddev
->pers
->run(mddev
);
4532 printk(KERN_ERR
"md: pers->run() failed ...\n");
4533 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4534 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4535 " but 'external_size' not in effect?\n", __func__
);
4537 "md: invalid array_size %llu > default size %llu\n",
4538 (unsigned long long)mddev
->array_sectors
/ 2,
4539 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4541 mddev
->pers
->stop(mddev
);
4543 if (err
== 0 && mddev
->pers
->sync_request
) {
4544 err
= bitmap_create(mddev
);
4546 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4547 mdname(mddev
), err
);
4548 mddev
->pers
->stop(mddev
);
4552 module_put(mddev
->pers
->owner
);
4554 bitmap_destroy(mddev
);
4557 if (mddev
->pers
->sync_request
) {
4558 if (mddev
->kobj
.sd
&&
4559 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4561 "md: cannot register extra attributes for %s\n",
4563 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4564 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4567 atomic_set(&mddev
->writes_pending
,0);
4568 atomic_set(&mddev
->max_corr_read_errors
,
4569 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4570 mddev
->safemode
= 0;
4571 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4572 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4573 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4577 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4578 if (rdev
->raid_disk
>= 0) {
4580 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4581 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4582 /* failure here is OK */;
4585 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4588 md_update_sb(mddev
, 0);
4590 md_wakeup_thread(mddev
->thread
);
4591 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4593 md_new_event(mddev
);
4594 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4595 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4596 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4599 EXPORT_SYMBOL_GPL(md_run
);
4601 static int do_md_run(mddev_t
*mddev
)
4605 err
= md_run(mddev
);
4608 err
= bitmap_load(mddev
);
4610 bitmap_destroy(mddev
);
4613 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4614 revalidate_disk(mddev
->gendisk
);
4615 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4620 static int restart_array(mddev_t
*mddev
)
4622 struct gendisk
*disk
= mddev
->gendisk
;
4624 /* Complain if it has no devices */
4625 if (list_empty(&mddev
->disks
))
4631 mddev
->safemode
= 0;
4633 set_disk_ro(disk
, 0);
4634 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4636 /* Kick recovery or resync if necessary */
4637 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4638 md_wakeup_thread(mddev
->thread
);
4639 md_wakeup_thread(mddev
->sync_thread
);
4640 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4644 /* similar to deny_write_access, but accounts for our holding a reference
4645 * to the file ourselves */
4646 static int deny_bitmap_write_access(struct file
* file
)
4648 struct inode
*inode
= file
->f_mapping
->host
;
4650 spin_lock(&inode
->i_lock
);
4651 if (atomic_read(&inode
->i_writecount
) > 1) {
4652 spin_unlock(&inode
->i_lock
);
4655 atomic_set(&inode
->i_writecount
, -1);
4656 spin_unlock(&inode
->i_lock
);
4661 void restore_bitmap_write_access(struct file
*file
)
4663 struct inode
*inode
= file
->f_mapping
->host
;
4665 spin_lock(&inode
->i_lock
);
4666 atomic_set(&inode
->i_writecount
, 1);
4667 spin_unlock(&inode
->i_lock
);
4670 static void md_clean(mddev_t
*mddev
)
4672 mddev
->array_sectors
= 0;
4673 mddev
->external_size
= 0;
4674 mddev
->dev_sectors
= 0;
4675 mddev
->raid_disks
= 0;
4676 mddev
->recovery_cp
= 0;
4677 mddev
->resync_min
= 0;
4678 mddev
->resync_max
= MaxSector
;
4679 mddev
->reshape_position
= MaxSector
;
4680 mddev
->external
= 0;
4681 mddev
->persistent
= 0;
4682 mddev
->level
= LEVEL_NONE
;
4683 mddev
->clevel
[0] = 0;
4686 mddev
->metadata_type
[0] = 0;
4687 mddev
->chunk_sectors
= 0;
4688 mddev
->ctime
= mddev
->utime
= 0;
4690 mddev
->max_disks
= 0;
4692 mddev
->can_decrease_events
= 0;
4693 mddev
->delta_disks
= 0;
4694 mddev
->new_level
= LEVEL_NONE
;
4695 mddev
->new_layout
= 0;
4696 mddev
->new_chunk_sectors
= 0;
4697 mddev
->curr_resync
= 0;
4698 mddev
->resync_mismatches
= 0;
4699 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4700 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4701 mddev
->recovery
= 0;
4703 mddev
->degraded
= 0;
4704 mddev
->safemode
= 0;
4705 mddev
->bitmap_info
.offset
= 0;
4706 mddev
->bitmap_info
.default_offset
= 0;
4707 mddev
->bitmap_info
.chunksize
= 0;
4708 mddev
->bitmap_info
.daemon_sleep
= 0;
4709 mddev
->bitmap_info
.max_write_behind
= 0;
4713 static void __md_stop_writes(mddev_t
*mddev
)
4715 if (mddev
->sync_thread
) {
4716 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4717 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4718 reap_sync_thread(mddev
);
4721 del_timer_sync(&mddev
->safemode_timer
);
4723 bitmap_flush(mddev
);
4724 md_super_wait(mddev
);
4726 if (!mddev
->in_sync
|| mddev
->flags
) {
4727 /* mark array as shutdown cleanly */
4729 md_update_sb(mddev
, 1);
4733 void md_stop_writes(mddev_t
*mddev
)
4736 __md_stop_writes(mddev
);
4737 mddev_unlock(mddev
);
4739 EXPORT_SYMBOL_GPL(md_stop_writes
);
4741 void md_stop(mddev_t
*mddev
)
4744 mddev
->pers
->stop(mddev
);
4745 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4746 mddev
->to_remove
= &md_redundancy_group
;
4747 module_put(mddev
->pers
->owner
);
4749 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4751 EXPORT_SYMBOL_GPL(md_stop
);
4753 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4756 mutex_lock(&mddev
->open_mutex
);
4757 if (atomic_read(&mddev
->openers
) > is_open
) {
4758 printk("md: %s still in use.\n",mdname(mddev
));
4763 __md_stop_writes(mddev
);
4769 set_disk_ro(mddev
->gendisk
, 1);
4770 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4771 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4775 mutex_unlock(&mddev
->open_mutex
);
4780 * 0 - completely stop and dis-assemble array
4781 * 2 - stop but do not disassemble array
4783 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4785 struct gendisk
*disk
= mddev
->gendisk
;
4788 mutex_lock(&mddev
->open_mutex
);
4789 if (atomic_read(&mddev
->openers
) > is_open
||
4790 mddev
->sysfs_active
) {
4791 printk("md: %s still in use.\n",mdname(mddev
));
4792 mutex_unlock(&mddev
->open_mutex
);
4798 set_disk_ro(disk
, 0);
4800 __md_stop_writes(mddev
);
4802 mddev
->queue
->merge_bvec_fn
= NULL
;
4803 mddev
->queue
->unplug_fn
= NULL
;
4804 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4806 /* tell userspace to handle 'inactive' */
4807 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4809 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4810 if (rdev
->raid_disk
>= 0) {
4812 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4813 sysfs_remove_link(&mddev
->kobj
, nm
);
4816 set_capacity(disk
, 0);
4817 mutex_unlock(&mddev
->open_mutex
);
4818 revalidate_disk(disk
);
4823 mutex_unlock(&mddev
->open_mutex
);
4825 * Free resources if final stop
4828 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4830 bitmap_destroy(mddev
);
4831 if (mddev
->bitmap_info
.file
) {
4832 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4833 fput(mddev
->bitmap_info
.file
);
4834 mddev
->bitmap_info
.file
= NULL
;
4836 mddev
->bitmap_info
.offset
= 0;
4838 export_array(mddev
);
4841 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4842 if (mddev
->hold_active
== UNTIL_STOP
)
4843 mddev
->hold_active
= 0;
4845 blk_integrity_unregister(disk
);
4846 md_new_event(mddev
);
4847 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4852 static void autorun_array(mddev_t
*mddev
)
4857 if (list_empty(&mddev
->disks
))
4860 printk(KERN_INFO
"md: running: ");
4862 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4863 char b
[BDEVNAME_SIZE
];
4864 printk("<%s>", bdevname(rdev
->bdev
,b
));
4868 err
= do_md_run(mddev
);
4870 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4871 do_md_stop(mddev
, 0, 0);
4876 * lets try to run arrays based on all disks that have arrived
4877 * until now. (those are in pending_raid_disks)
4879 * the method: pick the first pending disk, collect all disks with
4880 * the same UUID, remove all from the pending list and put them into
4881 * the 'same_array' list. Then order this list based on superblock
4882 * update time (freshest comes first), kick out 'old' disks and
4883 * compare superblocks. If everything's fine then run it.
4885 * If "unit" is allocated, then bump its reference count
4887 static void autorun_devices(int part
)
4889 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4891 char b
[BDEVNAME_SIZE
];
4893 printk(KERN_INFO
"md: autorun ...\n");
4894 while (!list_empty(&pending_raid_disks
)) {
4897 LIST_HEAD(candidates
);
4898 rdev0
= list_entry(pending_raid_disks
.next
,
4899 mdk_rdev_t
, same_set
);
4901 printk(KERN_INFO
"md: considering %s ...\n",
4902 bdevname(rdev0
->bdev
,b
));
4903 INIT_LIST_HEAD(&candidates
);
4904 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4905 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4906 printk(KERN_INFO
"md: adding %s ...\n",
4907 bdevname(rdev
->bdev
,b
));
4908 list_move(&rdev
->same_set
, &candidates
);
4911 * now we have a set of devices, with all of them having
4912 * mostly sane superblocks. It's time to allocate the
4916 dev
= MKDEV(mdp_major
,
4917 rdev0
->preferred_minor
<< MdpMinorShift
);
4918 unit
= MINOR(dev
) >> MdpMinorShift
;
4920 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4923 if (rdev0
->preferred_minor
!= unit
) {
4924 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4925 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4929 md_probe(dev
, NULL
, NULL
);
4930 mddev
= mddev_find(dev
);
4931 if (!mddev
|| !mddev
->gendisk
) {
4935 "md: cannot allocate memory for md drive.\n");
4938 if (mddev_lock(mddev
))
4939 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4941 else if (mddev
->raid_disks
|| mddev
->major_version
4942 || !list_empty(&mddev
->disks
)) {
4944 "md: %s already running, cannot run %s\n",
4945 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4946 mddev_unlock(mddev
);
4948 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4949 mddev
->persistent
= 1;
4950 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4951 list_del_init(&rdev
->same_set
);
4952 if (bind_rdev_to_array(rdev
, mddev
))
4955 autorun_array(mddev
);
4956 mddev_unlock(mddev
);
4958 /* on success, candidates will be empty, on error
4961 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4962 list_del_init(&rdev
->same_set
);
4967 printk(KERN_INFO
"md: ... autorun DONE.\n");
4969 #endif /* !MODULE */
4971 static int get_version(void __user
* arg
)
4975 ver
.major
= MD_MAJOR_VERSION
;
4976 ver
.minor
= MD_MINOR_VERSION
;
4977 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4979 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4985 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4987 mdu_array_info_t info
;
4988 int nr
,working
,insync
,failed
,spare
;
4991 nr
=working
=insync
=failed
=spare
=0;
4992 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4994 if (test_bit(Faulty
, &rdev
->flags
))
4998 if (test_bit(In_sync
, &rdev
->flags
))
5005 info
.major_version
= mddev
->major_version
;
5006 info
.minor_version
= mddev
->minor_version
;
5007 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5008 info
.ctime
= mddev
->ctime
;
5009 info
.level
= mddev
->level
;
5010 info
.size
= mddev
->dev_sectors
/ 2;
5011 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5014 info
.raid_disks
= mddev
->raid_disks
;
5015 info
.md_minor
= mddev
->md_minor
;
5016 info
.not_persistent
= !mddev
->persistent
;
5018 info
.utime
= mddev
->utime
;
5021 info
.state
= (1<<MD_SB_CLEAN
);
5022 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5023 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5024 info
.active_disks
= insync
;
5025 info
.working_disks
= working
;
5026 info
.failed_disks
= failed
;
5027 info
.spare_disks
= spare
;
5029 info
.layout
= mddev
->layout
;
5030 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5032 if (copy_to_user(arg
, &info
, sizeof(info
)))
5038 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
5040 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5041 char *ptr
, *buf
= NULL
;
5044 if (md_allow_write(mddev
))
5045 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5047 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5052 /* bitmap disabled, zero the first byte and copy out */
5053 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5054 file
->pathname
[0] = '\0';
5058 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5062 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5066 strcpy(file
->pathname
, ptr
);
5070 if (copy_to_user(arg
, file
, sizeof(*file
)))
5078 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5080 mdu_disk_info_t info
;
5083 if (copy_from_user(&info
, arg
, sizeof(info
)))
5086 rdev
= find_rdev_nr(mddev
, info
.number
);
5088 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5089 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5090 info
.raid_disk
= rdev
->raid_disk
;
5092 if (test_bit(Faulty
, &rdev
->flags
))
5093 info
.state
|= (1<<MD_DISK_FAULTY
);
5094 else if (test_bit(In_sync
, &rdev
->flags
)) {
5095 info
.state
|= (1<<MD_DISK_ACTIVE
);
5096 info
.state
|= (1<<MD_DISK_SYNC
);
5098 if (test_bit(WriteMostly
, &rdev
->flags
))
5099 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5101 info
.major
= info
.minor
= 0;
5102 info
.raid_disk
= -1;
5103 info
.state
= (1<<MD_DISK_REMOVED
);
5106 if (copy_to_user(arg
, &info
, sizeof(info
)))
5112 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5114 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5116 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5118 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5121 if (!mddev
->raid_disks
) {
5123 /* expecting a device which has a superblock */
5124 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5127 "md: md_import_device returned %ld\n",
5129 return PTR_ERR(rdev
);
5131 if (!list_empty(&mddev
->disks
)) {
5132 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5133 mdk_rdev_t
, same_set
);
5134 err
= super_types
[mddev
->major_version
]
5135 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5138 "md: %s has different UUID to %s\n",
5139 bdevname(rdev
->bdev
,b
),
5140 bdevname(rdev0
->bdev
,b2
));
5145 err
= bind_rdev_to_array(rdev
, mddev
);
5152 * add_new_disk can be used once the array is assembled
5153 * to add "hot spares". They must already have a superblock
5158 if (!mddev
->pers
->hot_add_disk
) {
5160 "%s: personality does not support diskops!\n",
5164 if (mddev
->persistent
)
5165 rdev
= md_import_device(dev
, mddev
->major_version
,
5166 mddev
->minor_version
);
5168 rdev
= md_import_device(dev
, -1, -1);
5171 "md: md_import_device returned %ld\n",
5173 return PTR_ERR(rdev
);
5175 /* set saved_raid_disk if appropriate */
5176 if (!mddev
->persistent
) {
5177 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5178 info
->raid_disk
< mddev
->raid_disks
) {
5179 rdev
->raid_disk
= info
->raid_disk
;
5180 set_bit(In_sync
, &rdev
->flags
);
5182 rdev
->raid_disk
= -1;
5184 super_types
[mddev
->major_version
].
5185 validate_super(mddev
, rdev
);
5186 if (test_bit(In_sync
, &rdev
->flags
))
5187 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5189 rdev
->saved_raid_disk
= -1;
5191 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5192 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5193 set_bit(WriteMostly
, &rdev
->flags
);
5195 clear_bit(WriteMostly
, &rdev
->flags
);
5197 rdev
->raid_disk
= -1;
5198 err
= bind_rdev_to_array(rdev
, mddev
);
5199 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5200 /* If there is hot_add_disk but no hot_remove_disk
5201 * then added disks for geometry changes,
5202 * and should be added immediately.
5204 super_types
[mddev
->major_version
].
5205 validate_super(mddev
, rdev
);
5206 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5208 unbind_rdev_from_array(rdev
);
5213 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5215 md_update_sb(mddev
, 1);
5216 if (mddev
->degraded
)
5217 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5218 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5219 md_wakeup_thread(mddev
->thread
);
5223 /* otherwise, add_new_disk is only allowed
5224 * for major_version==0 superblocks
5226 if (mddev
->major_version
!= 0) {
5227 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5232 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5234 rdev
= md_import_device(dev
, -1, 0);
5237 "md: error, md_import_device() returned %ld\n",
5239 return PTR_ERR(rdev
);
5241 rdev
->desc_nr
= info
->number
;
5242 if (info
->raid_disk
< mddev
->raid_disks
)
5243 rdev
->raid_disk
= info
->raid_disk
;
5245 rdev
->raid_disk
= -1;
5247 if (rdev
->raid_disk
< mddev
->raid_disks
)
5248 if (info
->state
& (1<<MD_DISK_SYNC
))
5249 set_bit(In_sync
, &rdev
->flags
);
5251 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5252 set_bit(WriteMostly
, &rdev
->flags
);
5254 if (!mddev
->persistent
) {
5255 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5256 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5258 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5259 rdev
->sectors
= rdev
->sb_start
;
5261 err
= bind_rdev_to_array(rdev
, mddev
);
5271 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5273 char b
[BDEVNAME_SIZE
];
5276 rdev
= find_rdev(mddev
, dev
);
5280 if (rdev
->raid_disk
>= 0)
5283 kick_rdev_from_array(rdev
);
5284 md_update_sb(mddev
, 1);
5285 md_new_event(mddev
);
5289 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5290 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5294 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5296 char b
[BDEVNAME_SIZE
];
5303 if (mddev
->major_version
!= 0) {
5304 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5305 " version-0 superblocks.\n",
5309 if (!mddev
->pers
->hot_add_disk
) {
5311 "%s: personality does not support diskops!\n",
5316 rdev
= md_import_device(dev
, -1, 0);
5319 "md: error, md_import_device() returned %ld\n",
5324 if (mddev
->persistent
)
5325 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5327 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5329 rdev
->sectors
= rdev
->sb_start
;
5331 if (test_bit(Faulty
, &rdev
->flags
)) {
5333 "md: can not hot-add faulty %s disk to %s!\n",
5334 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5338 clear_bit(In_sync
, &rdev
->flags
);
5340 rdev
->saved_raid_disk
= -1;
5341 err
= bind_rdev_to_array(rdev
, mddev
);
5346 * The rest should better be atomic, we can have disk failures
5347 * noticed in interrupt contexts ...
5350 rdev
->raid_disk
= -1;
5352 md_update_sb(mddev
, 1);
5355 * Kick recovery, maybe this spare has to be added to the
5356 * array immediately.
5358 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5359 md_wakeup_thread(mddev
->thread
);
5360 md_new_event(mddev
);
5368 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5373 if (!mddev
->pers
->quiesce
)
5375 if (mddev
->recovery
|| mddev
->sync_thread
)
5377 /* we should be able to change the bitmap.. */
5383 return -EEXIST
; /* cannot add when bitmap is present */
5384 mddev
->bitmap_info
.file
= fget(fd
);
5386 if (mddev
->bitmap_info
.file
== NULL
) {
5387 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5392 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5394 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5396 fput(mddev
->bitmap_info
.file
);
5397 mddev
->bitmap_info
.file
= NULL
;
5400 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5401 } else if (mddev
->bitmap
== NULL
)
5402 return -ENOENT
; /* cannot remove what isn't there */
5405 mddev
->pers
->quiesce(mddev
, 1);
5407 err
= bitmap_create(mddev
);
5409 err
= bitmap_load(mddev
);
5411 if (fd
< 0 || err
) {
5412 bitmap_destroy(mddev
);
5413 fd
= -1; /* make sure to put the file */
5415 mddev
->pers
->quiesce(mddev
, 0);
5418 if (mddev
->bitmap_info
.file
) {
5419 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5420 fput(mddev
->bitmap_info
.file
);
5422 mddev
->bitmap_info
.file
= NULL
;
5429 * set_array_info is used two different ways
5430 * The original usage is when creating a new array.
5431 * In this usage, raid_disks is > 0 and it together with
5432 * level, size, not_persistent,layout,chunksize determine the
5433 * shape of the array.
5434 * This will always create an array with a type-0.90.0 superblock.
5435 * The newer usage is when assembling an array.
5436 * In this case raid_disks will be 0, and the major_version field is
5437 * use to determine which style super-blocks are to be found on the devices.
5438 * The minor and patch _version numbers are also kept incase the
5439 * super_block handler wishes to interpret them.
5441 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5444 if (info
->raid_disks
== 0) {
5445 /* just setting version number for superblock loading */
5446 if (info
->major_version
< 0 ||
5447 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5448 super_types
[info
->major_version
].name
== NULL
) {
5449 /* maybe try to auto-load a module? */
5451 "md: superblock version %d not known\n",
5452 info
->major_version
);
5455 mddev
->major_version
= info
->major_version
;
5456 mddev
->minor_version
= info
->minor_version
;
5457 mddev
->patch_version
= info
->patch_version
;
5458 mddev
->persistent
= !info
->not_persistent
;
5459 /* ensure mddev_put doesn't delete this now that there
5460 * is some minimal configuration.
5462 mddev
->ctime
= get_seconds();
5465 mddev
->major_version
= MD_MAJOR_VERSION
;
5466 mddev
->minor_version
= MD_MINOR_VERSION
;
5467 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5468 mddev
->ctime
= get_seconds();
5470 mddev
->level
= info
->level
;
5471 mddev
->clevel
[0] = 0;
5472 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5473 mddev
->raid_disks
= info
->raid_disks
;
5474 /* don't set md_minor, it is determined by which /dev/md* was
5477 if (info
->state
& (1<<MD_SB_CLEAN
))
5478 mddev
->recovery_cp
= MaxSector
;
5480 mddev
->recovery_cp
= 0;
5481 mddev
->persistent
= ! info
->not_persistent
;
5482 mddev
->external
= 0;
5484 mddev
->layout
= info
->layout
;
5485 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5487 mddev
->max_disks
= MD_SB_DISKS
;
5489 if (mddev
->persistent
)
5491 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5493 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5494 mddev
->bitmap_info
.offset
= 0;
5496 mddev
->reshape_position
= MaxSector
;
5499 * Generate a 128 bit UUID
5501 get_random_bytes(mddev
->uuid
, 16);
5503 mddev
->new_level
= mddev
->level
;
5504 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5505 mddev
->new_layout
= mddev
->layout
;
5506 mddev
->delta_disks
= 0;
5511 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5513 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5515 if (mddev
->external_size
)
5518 mddev
->array_sectors
= array_sectors
;
5520 EXPORT_SYMBOL(md_set_array_sectors
);
5522 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5526 int fit
= (num_sectors
== 0);
5528 if (mddev
->pers
->resize
== NULL
)
5530 /* The "num_sectors" is the number of sectors of each device that
5531 * is used. This can only make sense for arrays with redundancy.
5532 * linear and raid0 always use whatever space is available. We can only
5533 * consider changing this number if no resync or reconstruction is
5534 * happening, and if the new size is acceptable. It must fit before the
5535 * sb_start or, if that is <data_offset, it must fit before the size
5536 * of each device. If num_sectors is zero, we find the largest size
5539 if (mddev
->sync_thread
)
5542 /* Sorry, cannot grow a bitmap yet, just remove it,
5546 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5547 sector_t avail
= rdev
->sectors
;
5549 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5550 num_sectors
= avail
;
5551 if (avail
< num_sectors
)
5554 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5556 revalidate_disk(mddev
->gendisk
);
5560 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5563 /* change the number of raid disks */
5564 if (mddev
->pers
->check_reshape
== NULL
)
5566 if (raid_disks
<= 0 ||
5567 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5569 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5571 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5573 rv
= mddev
->pers
->check_reshape(mddev
);
5579 * update_array_info is used to change the configuration of an
5581 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5582 * fields in the info are checked against the array.
5583 * Any differences that cannot be handled will cause an error.
5584 * Normally, only one change can be managed at a time.
5586 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5592 /* calculate expected state,ignoring low bits */
5593 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5594 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5596 if (mddev
->major_version
!= info
->major_version
||
5597 mddev
->minor_version
!= info
->minor_version
||
5598 /* mddev->patch_version != info->patch_version || */
5599 mddev
->ctime
!= info
->ctime
||
5600 mddev
->level
!= info
->level
||
5601 /* mddev->layout != info->layout || */
5602 !mddev
->persistent
!= info
->not_persistent
||
5603 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5604 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5605 ((state
^info
->state
) & 0xfffffe00)
5608 /* Check there is only one change */
5609 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5611 if (mddev
->raid_disks
!= info
->raid_disks
)
5613 if (mddev
->layout
!= info
->layout
)
5615 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5622 if (mddev
->layout
!= info
->layout
) {
5624 * we don't need to do anything at the md level, the
5625 * personality will take care of it all.
5627 if (mddev
->pers
->check_reshape
== NULL
)
5630 mddev
->new_layout
= info
->layout
;
5631 rv
= mddev
->pers
->check_reshape(mddev
);
5633 mddev
->new_layout
= mddev
->layout
;
5637 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5638 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5640 if (mddev
->raid_disks
!= info
->raid_disks
)
5641 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5643 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5644 if (mddev
->pers
->quiesce
== NULL
)
5646 if (mddev
->recovery
|| mddev
->sync_thread
)
5648 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5649 /* add the bitmap */
5652 if (mddev
->bitmap_info
.default_offset
== 0)
5654 mddev
->bitmap_info
.offset
=
5655 mddev
->bitmap_info
.default_offset
;
5656 mddev
->pers
->quiesce(mddev
, 1);
5657 rv
= bitmap_create(mddev
);
5659 rv
= bitmap_load(mddev
);
5661 bitmap_destroy(mddev
);
5662 mddev
->pers
->quiesce(mddev
, 0);
5664 /* remove the bitmap */
5667 if (mddev
->bitmap
->file
)
5669 mddev
->pers
->quiesce(mddev
, 1);
5670 bitmap_destroy(mddev
);
5671 mddev
->pers
->quiesce(mddev
, 0);
5672 mddev
->bitmap_info
.offset
= 0;
5675 md_update_sb(mddev
, 1);
5679 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5683 if (mddev
->pers
== NULL
)
5686 rdev
= find_rdev(mddev
, dev
);
5690 md_error(mddev
, rdev
);
5695 * We have a problem here : there is no easy way to give a CHS
5696 * virtual geometry. We currently pretend that we have a 2 heads
5697 * 4 sectors (with a BIG number of cylinders...). This drives
5698 * dosfs just mad... ;-)
5700 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5702 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5706 geo
->cylinders
= mddev
->array_sectors
/ 8;
5710 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5711 unsigned int cmd
, unsigned long arg
)
5714 void __user
*argp
= (void __user
*)arg
;
5715 mddev_t
*mddev
= NULL
;
5718 if (!capable(CAP_SYS_ADMIN
))
5722 * Commands dealing with the RAID driver but not any
5728 err
= get_version(argp
);
5731 case PRINT_RAID_DEBUG
:
5739 autostart_arrays(arg
);
5746 * Commands creating/starting a new array:
5749 mddev
= bdev
->bd_disk
->private_data
;
5756 err
= mddev_lock(mddev
);
5759 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5766 case SET_ARRAY_INFO
:
5768 mdu_array_info_t info
;
5770 memset(&info
, 0, sizeof(info
));
5771 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5776 err
= update_array_info(mddev
, &info
);
5778 printk(KERN_WARNING
"md: couldn't update"
5779 " array info. %d\n", err
);
5784 if (!list_empty(&mddev
->disks
)) {
5786 "md: array %s already has disks!\n",
5791 if (mddev
->raid_disks
) {
5793 "md: array %s already initialised!\n",
5798 err
= set_array_info(mddev
, &info
);
5800 printk(KERN_WARNING
"md: couldn't set"
5801 " array info. %d\n", err
);
5811 * Commands querying/configuring an existing array:
5813 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5814 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5815 if ((!mddev
->raid_disks
&& !mddev
->external
)
5816 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5817 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5818 && cmd
!= GET_BITMAP_FILE
) {
5824 * Commands even a read-only array can execute:
5828 case GET_ARRAY_INFO
:
5829 err
= get_array_info(mddev
, argp
);
5832 case GET_BITMAP_FILE
:
5833 err
= get_bitmap_file(mddev
, argp
);
5837 err
= get_disk_info(mddev
, argp
);
5840 case RESTART_ARRAY_RW
:
5841 err
= restart_array(mddev
);
5845 err
= do_md_stop(mddev
, 0, 1);
5849 err
= md_set_readonly(mddev
, 1);
5853 if (get_user(ro
, (int __user
*)(arg
))) {
5859 /* if the bdev is going readonly the value of mddev->ro
5860 * does not matter, no writes are coming
5865 /* are we are already prepared for writes? */
5869 /* transitioning to readauto need only happen for
5870 * arrays that call md_write_start
5873 err
= restart_array(mddev
);
5876 set_disk_ro(mddev
->gendisk
, 0);
5883 * The remaining ioctls are changing the state of the
5884 * superblock, so we do not allow them on read-only arrays.
5885 * However non-MD ioctls (e.g. get-size) will still come through
5886 * here and hit the 'default' below, so only disallow
5887 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5889 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5890 if (mddev
->ro
== 2) {
5892 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5893 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5894 md_wakeup_thread(mddev
->thread
);
5905 mdu_disk_info_t info
;
5906 if (copy_from_user(&info
, argp
, sizeof(info
)))
5909 err
= add_new_disk(mddev
, &info
);
5913 case HOT_REMOVE_DISK
:
5914 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5918 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5921 case SET_DISK_FAULTY
:
5922 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5926 err
= do_md_run(mddev
);
5929 case SET_BITMAP_FILE
:
5930 err
= set_bitmap_file(mddev
, (int)arg
);
5940 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5942 mddev
->hold_active
= 0;
5943 mddev_unlock(mddev
);
5952 #ifdef CONFIG_COMPAT
5953 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5954 unsigned int cmd
, unsigned long arg
)
5957 case HOT_REMOVE_DISK
:
5959 case SET_DISK_FAULTY
:
5960 case SET_BITMAP_FILE
:
5961 /* These take in integer arg, do not convert */
5964 arg
= (unsigned long)compat_ptr(arg
);
5968 return md_ioctl(bdev
, mode
, cmd
, arg
);
5970 #endif /* CONFIG_COMPAT */
5972 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5975 * Succeed if we can lock the mddev, which confirms that
5976 * it isn't being stopped right now.
5978 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5981 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5982 /* we are racing with mddev_put which is discarding this
5986 /* Wait until bdev->bd_disk is definitely gone */
5987 flush_workqueue(md_misc_wq
);
5988 /* Then retry the open from the top */
5989 return -ERESTARTSYS
;
5991 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5993 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5997 atomic_inc(&mddev
->openers
);
5998 mutex_unlock(&mddev
->open_mutex
);
6000 check_disk_size_change(mddev
->gendisk
, bdev
);
6005 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6007 mddev_t
*mddev
= disk
->private_data
;
6010 atomic_dec(&mddev
->openers
);
6015 static const struct block_device_operations md_fops
=
6017 .owner
= THIS_MODULE
,
6019 .release
= md_release
,
6021 #ifdef CONFIG_COMPAT
6022 .compat_ioctl
= md_compat_ioctl
,
6024 .getgeo
= md_getgeo
,
6027 static int md_thread(void * arg
)
6029 mdk_thread_t
*thread
= arg
;
6032 * md_thread is a 'system-thread', it's priority should be very
6033 * high. We avoid resource deadlocks individually in each
6034 * raid personality. (RAID5 does preallocation) We also use RR and
6035 * the very same RT priority as kswapd, thus we will never get
6036 * into a priority inversion deadlock.
6038 * we definitely have to have equal or higher priority than
6039 * bdflush, otherwise bdflush will deadlock if there are too
6040 * many dirty RAID5 blocks.
6043 allow_signal(SIGKILL
);
6044 while (!kthread_should_stop()) {
6046 /* We need to wait INTERRUPTIBLE so that
6047 * we don't add to the load-average.
6048 * That means we need to be sure no signals are
6051 if (signal_pending(current
))
6052 flush_signals(current
);
6054 wait_event_interruptible_timeout
6056 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6057 || kthread_should_stop(),
6060 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6061 if (!kthread_should_stop())
6062 thread
->run(thread
->mddev
);
6068 void md_wakeup_thread(mdk_thread_t
*thread
)
6071 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6072 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6073 wake_up(&thread
->wqueue
);
6077 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6080 mdk_thread_t
*thread
;
6082 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6086 init_waitqueue_head(&thread
->wqueue
);
6089 thread
->mddev
= mddev
;
6090 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6091 thread
->tsk
= kthread_run(md_thread
, thread
,
6093 mdname(thread
->mddev
),
6094 name
?: mddev
->pers
->name
);
6095 if (IS_ERR(thread
->tsk
)) {
6102 void md_unregister_thread(mdk_thread_t
*thread
)
6106 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6108 kthread_stop(thread
->tsk
);
6112 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6119 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6122 if (mddev
->external
)
6123 set_bit(Blocked
, &rdev
->flags
);
6125 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6127 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6128 __builtin_return_address(0),__builtin_return_address(1),
6129 __builtin_return_address(2),__builtin_return_address(3));
6133 if (!mddev
->pers
->error_handler
)
6135 mddev
->pers
->error_handler(mddev
,rdev
);
6136 if (mddev
->degraded
)
6137 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6138 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6139 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6140 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6141 md_wakeup_thread(mddev
->thread
);
6142 if (mddev
->event_work
.func
)
6143 queue_work(md_misc_wq
, &mddev
->event_work
);
6144 md_new_event_inintr(mddev
);
6147 /* seq_file implementation /proc/mdstat */
6149 static void status_unused(struct seq_file
*seq
)
6154 seq_printf(seq
, "unused devices: ");
6156 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6157 char b
[BDEVNAME_SIZE
];
6159 seq_printf(seq
, "%s ",
6160 bdevname(rdev
->bdev
,b
));
6163 seq_printf(seq
, "<none>");
6165 seq_printf(seq
, "\n");
6169 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6171 sector_t max_sectors
, resync
, res
;
6172 unsigned long dt
, db
;
6175 unsigned int per_milli
;
6177 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6179 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6180 max_sectors
= mddev
->resync_max_sectors
;
6182 max_sectors
= mddev
->dev_sectors
;
6185 * Should not happen.
6191 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6192 * in a sector_t, and (max_sectors>>scale) will fit in a
6193 * u32, as those are the requirements for sector_div.
6194 * Thus 'scale' must be at least 10
6197 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6198 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6201 res
= (resync
>>scale
)*1000;
6202 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6206 int i
, x
= per_milli
/50, y
= 20-x
;
6207 seq_printf(seq
, "[");
6208 for (i
= 0; i
< x
; i
++)
6209 seq_printf(seq
, "=");
6210 seq_printf(seq
, ">");
6211 for (i
= 0; i
< y
; i
++)
6212 seq_printf(seq
, ".");
6213 seq_printf(seq
, "] ");
6215 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6216 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6218 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6220 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6221 "resync" : "recovery"))),
6222 per_milli
/10, per_milli
% 10,
6223 (unsigned long long) resync
/2,
6224 (unsigned long long) max_sectors
/2);
6227 * dt: time from mark until now
6228 * db: blocks written from mark until now
6229 * rt: remaining time
6231 * rt is a sector_t, so could be 32bit or 64bit.
6232 * So we divide before multiply in case it is 32bit and close
6234 * We scale the divisor (db) by 32 to avoid loosing precision
6235 * near the end of resync when the number of remaining sectors
6237 * We then divide rt by 32 after multiplying by db to compensate.
6238 * The '+1' avoids division by zero if db is very small.
6240 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6242 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6243 - mddev
->resync_mark_cnt
;
6245 rt
= max_sectors
- resync
; /* number of remaining sectors */
6246 sector_div(rt
, db
/32+1);
6250 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6251 ((unsigned long)rt
% 60)/6);
6253 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6256 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6258 struct list_head
*tmp
;
6268 spin_lock(&all_mddevs_lock
);
6269 list_for_each(tmp
,&all_mddevs
)
6271 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6273 spin_unlock(&all_mddevs_lock
);
6276 spin_unlock(&all_mddevs_lock
);
6278 return (void*)2;/* tail */
6282 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6284 struct list_head
*tmp
;
6285 mddev_t
*next_mddev
, *mddev
= v
;
6291 spin_lock(&all_mddevs_lock
);
6293 tmp
= all_mddevs
.next
;
6295 tmp
= mddev
->all_mddevs
.next
;
6296 if (tmp
!= &all_mddevs
)
6297 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6299 next_mddev
= (void*)2;
6302 spin_unlock(&all_mddevs_lock
);
6310 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6314 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6318 struct mdstat_info
{
6322 static int md_seq_show(struct seq_file
*seq
, void *v
)
6327 struct mdstat_info
*mi
= seq
->private;
6328 struct bitmap
*bitmap
;
6330 if (v
== (void*)1) {
6331 struct mdk_personality
*pers
;
6332 seq_printf(seq
, "Personalities : ");
6333 spin_lock(&pers_lock
);
6334 list_for_each_entry(pers
, &pers_list
, list
)
6335 seq_printf(seq
, "[%s] ", pers
->name
);
6337 spin_unlock(&pers_lock
);
6338 seq_printf(seq
, "\n");
6339 mi
->event
= atomic_read(&md_event_count
);
6342 if (v
== (void*)2) {
6347 if (mddev_lock(mddev
) < 0)
6350 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6351 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6352 mddev
->pers
? "" : "in");
6355 seq_printf(seq
, " (read-only)");
6357 seq_printf(seq
, " (auto-read-only)");
6358 seq_printf(seq
, " %s", mddev
->pers
->name
);
6362 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6363 char b
[BDEVNAME_SIZE
];
6364 seq_printf(seq
, " %s[%d]",
6365 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6366 if (test_bit(WriteMostly
, &rdev
->flags
))
6367 seq_printf(seq
, "(W)");
6368 if (test_bit(Faulty
, &rdev
->flags
)) {
6369 seq_printf(seq
, "(F)");
6371 } else if (rdev
->raid_disk
< 0)
6372 seq_printf(seq
, "(S)"); /* spare */
6373 sectors
+= rdev
->sectors
;
6376 if (!list_empty(&mddev
->disks
)) {
6378 seq_printf(seq
, "\n %llu blocks",
6379 (unsigned long long)
6380 mddev
->array_sectors
/ 2);
6382 seq_printf(seq
, "\n %llu blocks",
6383 (unsigned long long)sectors
/ 2);
6385 if (mddev
->persistent
) {
6386 if (mddev
->major_version
!= 0 ||
6387 mddev
->minor_version
!= 90) {
6388 seq_printf(seq
," super %d.%d",
6389 mddev
->major_version
,
6390 mddev
->minor_version
);
6392 } else if (mddev
->external
)
6393 seq_printf(seq
, " super external:%s",
6394 mddev
->metadata_type
);
6396 seq_printf(seq
, " super non-persistent");
6399 mddev
->pers
->status(seq
, mddev
);
6400 seq_printf(seq
, "\n ");
6401 if (mddev
->pers
->sync_request
) {
6402 if (mddev
->curr_resync
> 2) {
6403 status_resync(seq
, mddev
);
6404 seq_printf(seq
, "\n ");
6405 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6406 seq_printf(seq
, "\tresync=DELAYED\n ");
6407 else if (mddev
->recovery_cp
< MaxSector
)
6408 seq_printf(seq
, "\tresync=PENDING\n ");
6411 seq_printf(seq
, "\n ");
6413 if ((bitmap
= mddev
->bitmap
)) {
6414 unsigned long chunk_kb
;
6415 unsigned long flags
;
6416 spin_lock_irqsave(&bitmap
->lock
, flags
);
6417 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6418 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6420 bitmap
->pages
- bitmap
->missing_pages
,
6422 (bitmap
->pages
- bitmap
->missing_pages
)
6423 << (PAGE_SHIFT
- 10),
6424 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6425 chunk_kb
? "KB" : "B");
6427 seq_printf(seq
, ", file: ");
6428 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6431 seq_printf(seq
, "\n");
6432 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6435 seq_printf(seq
, "\n");
6437 mddev_unlock(mddev
);
6442 static const struct seq_operations md_seq_ops
= {
6443 .start
= md_seq_start
,
6444 .next
= md_seq_next
,
6445 .stop
= md_seq_stop
,
6446 .show
= md_seq_show
,
6449 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6452 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6456 error
= seq_open(file
, &md_seq_ops
);
6460 struct seq_file
*p
= file
->private_data
;
6462 mi
->event
= atomic_read(&md_event_count
);
6467 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6469 struct seq_file
*m
= filp
->private_data
;
6470 struct mdstat_info
*mi
= m
->private;
6473 poll_wait(filp
, &md_event_waiters
, wait
);
6475 /* always allow read */
6476 mask
= POLLIN
| POLLRDNORM
;
6478 if (mi
->event
!= atomic_read(&md_event_count
))
6479 mask
|= POLLERR
| POLLPRI
;
6483 static const struct file_operations md_seq_fops
= {
6484 .owner
= THIS_MODULE
,
6485 .open
= md_seq_open
,
6487 .llseek
= seq_lseek
,
6488 .release
= seq_release_private
,
6489 .poll
= mdstat_poll
,
6492 int register_md_personality(struct mdk_personality
*p
)
6494 spin_lock(&pers_lock
);
6495 list_add_tail(&p
->list
, &pers_list
);
6496 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6497 spin_unlock(&pers_lock
);
6501 int unregister_md_personality(struct mdk_personality
*p
)
6503 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6504 spin_lock(&pers_lock
);
6505 list_del_init(&p
->list
);
6506 spin_unlock(&pers_lock
);
6510 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6518 rdev_for_each_rcu(rdev
, mddev
) {
6519 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6520 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6521 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6522 atomic_read(&disk
->sync_io
);
6523 /* sync IO will cause sync_io to increase before the disk_stats
6524 * as sync_io is counted when a request starts, and
6525 * disk_stats is counted when it completes.
6526 * So resync activity will cause curr_events to be smaller than
6527 * when there was no such activity.
6528 * non-sync IO will cause disk_stat to increase without
6529 * increasing sync_io so curr_events will (eventually)
6530 * be larger than it was before. Once it becomes
6531 * substantially larger, the test below will cause
6532 * the array to appear non-idle, and resync will slow
6534 * If there is a lot of outstanding resync activity when
6535 * we set last_event to curr_events, then all that activity
6536 * completing might cause the array to appear non-idle
6537 * and resync will be slowed down even though there might
6538 * not have been non-resync activity. This will only
6539 * happen once though. 'last_events' will soon reflect
6540 * the state where there is little or no outstanding
6541 * resync requests, and further resync activity will
6542 * always make curr_events less than last_events.
6545 if (init
|| curr_events
- rdev
->last_events
> 64) {
6546 rdev
->last_events
= curr_events
;
6554 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6556 /* another "blocks" (512byte) blocks have been synced */
6557 atomic_sub(blocks
, &mddev
->recovery_active
);
6558 wake_up(&mddev
->recovery_wait
);
6560 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6561 md_wakeup_thread(mddev
->thread
);
6562 // stop recovery, signal do_sync ....
6567 /* md_write_start(mddev, bi)
6568 * If we need to update some array metadata (e.g. 'active' flag
6569 * in superblock) before writing, schedule a superblock update
6570 * and wait for it to complete.
6572 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6575 if (bio_data_dir(bi
) != WRITE
)
6578 BUG_ON(mddev
->ro
== 1);
6579 if (mddev
->ro
== 2) {
6580 /* need to switch to read/write */
6582 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6583 md_wakeup_thread(mddev
->thread
);
6584 md_wakeup_thread(mddev
->sync_thread
);
6587 atomic_inc(&mddev
->writes_pending
);
6588 if (mddev
->safemode
== 1)
6589 mddev
->safemode
= 0;
6590 if (mddev
->in_sync
) {
6591 spin_lock_irq(&mddev
->write_lock
);
6592 if (mddev
->in_sync
) {
6594 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6595 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6596 md_wakeup_thread(mddev
->thread
);
6599 spin_unlock_irq(&mddev
->write_lock
);
6602 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6603 wait_event(mddev
->sb_wait
,
6604 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6607 void md_write_end(mddev_t
*mddev
)
6609 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6610 if (mddev
->safemode
== 2)
6611 md_wakeup_thread(mddev
->thread
);
6612 else if (mddev
->safemode_delay
)
6613 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6617 /* md_allow_write(mddev)
6618 * Calling this ensures that the array is marked 'active' so that writes
6619 * may proceed without blocking. It is important to call this before
6620 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6621 * Must be called with mddev_lock held.
6623 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6624 * is dropped, so return -EAGAIN after notifying userspace.
6626 int md_allow_write(mddev_t
*mddev
)
6632 if (!mddev
->pers
->sync_request
)
6635 spin_lock_irq(&mddev
->write_lock
);
6636 if (mddev
->in_sync
) {
6638 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6639 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6640 if (mddev
->safemode_delay
&&
6641 mddev
->safemode
== 0)
6642 mddev
->safemode
= 1;
6643 spin_unlock_irq(&mddev
->write_lock
);
6644 md_update_sb(mddev
, 0);
6645 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6647 spin_unlock_irq(&mddev
->write_lock
);
6649 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6654 EXPORT_SYMBOL_GPL(md_allow_write
);
6656 void md_unplug(mddev_t
*mddev
)
6659 blk_unplug(mddev
->queue
);
6661 mddev
->plug
->unplug_fn(mddev
->plug
);
6664 #define SYNC_MARKS 10
6665 #define SYNC_MARK_STEP (3*HZ)
6666 void md_do_sync(mddev_t
*mddev
)
6669 unsigned int currspeed
= 0,
6671 sector_t max_sectors
,j
, io_sectors
;
6672 unsigned long mark
[SYNC_MARKS
];
6673 sector_t mark_cnt
[SYNC_MARKS
];
6675 struct list_head
*tmp
;
6676 sector_t last_check
;
6681 /* just incase thread restarts... */
6682 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6684 if (mddev
->ro
) /* never try to sync a read-only array */
6687 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6688 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6689 desc
= "data-check";
6690 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6691 desc
= "requested-resync";
6694 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6699 /* we overload curr_resync somewhat here.
6700 * 0 == not engaged in resync at all
6701 * 2 == checking that there is no conflict with another sync
6702 * 1 == like 2, but have yielded to allow conflicting resync to
6704 * other == active in resync - this many blocks
6706 * Before starting a resync we must have set curr_resync to
6707 * 2, and then checked that every "conflicting" array has curr_resync
6708 * less than ours. When we find one that is the same or higher
6709 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6710 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6711 * This will mean we have to start checking from the beginning again.
6716 mddev
->curr_resync
= 2;
6719 if (kthread_should_stop())
6720 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6722 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6724 for_each_mddev(mddev2
, tmp
) {
6725 if (mddev2
== mddev
)
6727 if (!mddev
->parallel_resync
6728 && mddev2
->curr_resync
6729 && match_mddev_units(mddev
, mddev2
)) {
6731 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6732 /* arbitrarily yield */
6733 mddev
->curr_resync
= 1;
6734 wake_up(&resync_wait
);
6736 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6737 /* no need to wait here, we can wait the next
6738 * time 'round when curr_resync == 2
6741 /* We need to wait 'interruptible' so as not to
6742 * contribute to the load average, and not to
6743 * be caught by 'softlockup'
6745 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6746 if (!kthread_should_stop() &&
6747 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6748 printk(KERN_INFO
"md: delaying %s of %s"
6749 " until %s has finished (they"
6750 " share one or more physical units)\n",
6751 desc
, mdname(mddev
), mdname(mddev2
));
6753 if (signal_pending(current
))
6754 flush_signals(current
);
6756 finish_wait(&resync_wait
, &wq
);
6759 finish_wait(&resync_wait
, &wq
);
6762 } while (mddev
->curr_resync
< 2);
6765 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6766 /* resync follows the size requested by the personality,
6767 * which defaults to physical size, but can be virtual size
6769 max_sectors
= mddev
->resync_max_sectors
;
6770 mddev
->resync_mismatches
= 0;
6771 /* we don't use the checkpoint if there's a bitmap */
6772 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6773 j
= mddev
->resync_min
;
6774 else if (!mddev
->bitmap
)
6775 j
= mddev
->recovery_cp
;
6777 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6778 max_sectors
= mddev
->dev_sectors
;
6780 /* recovery follows the physical size of devices */
6781 max_sectors
= mddev
->dev_sectors
;
6784 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6785 if (rdev
->raid_disk
>= 0 &&
6786 !test_bit(Faulty
, &rdev
->flags
) &&
6787 !test_bit(In_sync
, &rdev
->flags
) &&
6788 rdev
->recovery_offset
< j
)
6789 j
= rdev
->recovery_offset
;
6793 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6794 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6795 " %d KB/sec/disk.\n", speed_min(mddev
));
6796 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6797 "(but not more than %d KB/sec) for %s.\n",
6798 speed_max(mddev
), desc
);
6800 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6803 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6805 mark_cnt
[m
] = io_sectors
;
6808 mddev
->resync_mark
= mark
[last_mark
];
6809 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6812 * Tune reconstruction:
6814 window
= 32*(PAGE_SIZE
/512);
6815 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6816 window
/2,(unsigned long long) max_sectors
/2);
6818 atomic_set(&mddev
->recovery_active
, 0);
6823 "md: resuming %s of %s from checkpoint.\n",
6824 desc
, mdname(mddev
));
6825 mddev
->curr_resync
= j
;
6827 mddev
->curr_resync_completed
= j
;
6829 while (j
< max_sectors
) {
6834 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6835 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6836 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6837 > (max_sectors
>> 4)) ||
6838 (j
- mddev
->curr_resync_completed
)*2
6839 >= mddev
->resync_max
- mddev
->curr_resync_completed
6841 /* time to update curr_resync_completed */
6843 wait_event(mddev
->recovery_wait
,
6844 atomic_read(&mddev
->recovery_active
) == 0);
6845 mddev
->curr_resync_completed
= j
;
6846 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6847 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6850 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6851 /* As this condition is controlled by user-space,
6852 * we can block indefinitely, so use '_interruptible'
6853 * to avoid triggering warnings.
6855 flush_signals(current
); /* just in case */
6856 wait_event_interruptible(mddev
->recovery_wait
,
6857 mddev
->resync_max
> j
6858 || kthread_should_stop());
6861 if (kthread_should_stop())
6864 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6865 currspeed
< speed_min(mddev
));
6867 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6871 if (!skipped
) { /* actual IO requested */
6872 io_sectors
+= sectors
;
6873 atomic_add(sectors
, &mddev
->recovery_active
);
6877 if (j
>1) mddev
->curr_resync
= j
;
6878 mddev
->curr_mark_cnt
= io_sectors
;
6879 if (last_check
== 0)
6880 /* this is the earliers that rebuilt will be
6881 * visible in /proc/mdstat
6883 md_new_event(mddev
);
6885 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6888 last_check
= io_sectors
;
6890 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6894 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6896 int next
= (last_mark
+1) % SYNC_MARKS
;
6898 mddev
->resync_mark
= mark
[next
];
6899 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6900 mark
[next
] = jiffies
;
6901 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6906 if (kthread_should_stop())
6911 * this loop exits only if either when we are slower than
6912 * the 'hard' speed limit, or the system was IO-idle for
6914 * the system might be non-idle CPU-wise, but we only care
6915 * about not overloading the IO subsystem. (things like an
6916 * e2fsck being done on the RAID array should execute fast)
6921 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6922 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6924 if (currspeed
> speed_min(mddev
)) {
6925 if ((currspeed
> speed_max(mddev
)) ||
6926 !is_mddev_idle(mddev
, 0)) {
6932 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6934 * this also signals 'finished resyncing' to md_stop
6939 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6941 /* tell personality that we are finished */
6942 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6944 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6945 mddev
->curr_resync
> 2) {
6946 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6947 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6948 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6950 "md: checkpointing %s of %s.\n",
6951 desc
, mdname(mddev
));
6952 mddev
->recovery_cp
= mddev
->curr_resync
;
6955 mddev
->recovery_cp
= MaxSector
;
6957 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6958 mddev
->curr_resync
= MaxSector
;
6960 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6961 if (rdev
->raid_disk
>= 0 &&
6962 mddev
->delta_disks
>= 0 &&
6963 !test_bit(Faulty
, &rdev
->flags
) &&
6964 !test_bit(In_sync
, &rdev
->flags
) &&
6965 rdev
->recovery_offset
< mddev
->curr_resync
)
6966 rdev
->recovery_offset
= mddev
->curr_resync
;
6970 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6973 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6974 /* We completed so min/max setting can be forgotten if used. */
6975 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6976 mddev
->resync_min
= 0;
6977 mddev
->resync_max
= MaxSector
;
6978 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6979 mddev
->resync_min
= mddev
->curr_resync_completed
;
6980 mddev
->curr_resync
= 0;
6981 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6982 mddev
->curr_resync_completed
= 0;
6983 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6984 wake_up(&resync_wait
);
6985 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6986 md_wakeup_thread(mddev
->thread
);
6991 * got a signal, exit.
6994 "md: md_do_sync() got signal ... exiting\n");
6995 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6999 EXPORT_SYMBOL_GPL(md_do_sync
);
7002 static int remove_and_add_spares(mddev_t
*mddev
)
7007 mddev
->curr_resync_completed
= 0;
7009 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7010 if (rdev
->raid_disk
>= 0 &&
7011 !test_bit(Blocked
, &rdev
->flags
) &&
7012 (test_bit(Faulty
, &rdev
->flags
) ||
7013 ! test_bit(In_sync
, &rdev
->flags
)) &&
7014 atomic_read(&rdev
->nr_pending
)==0) {
7015 if (mddev
->pers
->hot_remove_disk(
7016 mddev
, rdev
->raid_disk
)==0) {
7018 sprintf(nm
,"rd%d", rdev
->raid_disk
);
7019 sysfs_remove_link(&mddev
->kobj
, nm
);
7020 rdev
->raid_disk
= -1;
7024 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
7025 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7026 if (rdev
->raid_disk
>= 0 &&
7027 !test_bit(In_sync
, &rdev
->flags
) &&
7028 !test_bit(Blocked
, &rdev
->flags
))
7030 if (rdev
->raid_disk
< 0
7031 && !test_bit(Faulty
, &rdev
->flags
)) {
7032 rdev
->recovery_offset
= 0;
7034 hot_add_disk(mddev
, rdev
) == 0) {
7036 sprintf(nm
, "rd%d", rdev
->raid_disk
);
7037 if (sysfs_create_link(&mddev
->kobj
,
7039 /* failure here is OK */;
7041 md_new_event(mddev
);
7042 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7051 static void reap_sync_thread(mddev_t
*mddev
)
7055 /* resync has finished, collect result */
7056 md_unregister_thread(mddev
->sync_thread
);
7057 mddev
->sync_thread
= NULL
;
7058 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7059 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7061 /* activate any spares */
7062 if (mddev
->pers
->spare_active(mddev
))
7063 sysfs_notify(&mddev
->kobj
, NULL
,
7066 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7067 mddev
->pers
->finish_reshape
)
7068 mddev
->pers
->finish_reshape(mddev
);
7069 md_update_sb(mddev
, 1);
7071 /* if array is no-longer degraded, then any saved_raid_disk
7072 * information must be scrapped
7074 if (!mddev
->degraded
)
7075 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7076 rdev
->saved_raid_disk
= -1;
7078 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7079 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7080 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7081 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7082 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7083 /* flag recovery needed just to double check */
7084 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7085 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7086 md_new_event(mddev
);
7090 * This routine is regularly called by all per-raid-array threads to
7091 * deal with generic issues like resync and super-block update.
7092 * Raid personalities that don't have a thread (linear/raid0) do not
7093 * need this as they never do any recovery or update the superblock.
7095 * It does not do any resync itself, but rather "forks" off other threads
7096 * to do that as needed.
7097 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7098 * "->recovery" and create a thread at ->sync_thread.
7099 * When the thread finishes it sets MD_RECOVERY_DONE
7100 * and wakeups up this thread which will reap the thread and finish up.
7101 * This thread also removes any faulty devices (with nr_pending == 0).
7103 * The overall approach is:
7104 * 1/ if the superblock needs updating, update it.
7105 * 2/ If a recovery thread is running, don't do anything else.
7106 * 3/ If recovery has finished, clean up, possibly marking spares active.
7107 * 4/ If there are any faulty devices, remove them.
7108 * 5/ If array is degraded, try to add spares devices
7109 * 6/ If array has spares or is not in-sync, start a resync thread.
7111 void md_check_recovery(mddev_t
*mddev
)
7114 bitmap_daemon_work(mddev
);
7119 if (signal_pending(current
)) {
7120 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7121 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7123 mddev
->safemode
= 2;
7125 flush_signals(current
);
7128 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7131 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7132 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7133 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7134 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7135 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7136 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7140 if (mddev_trylock(mddev
)) {
7144 /* Only thing we do on a ro array is remove
7147 remove_and_add_spares(mddev
);
7148 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7152 if (!mddev
->external
) {
7154 spin_lock_irq(&mddev
->write_lock
);
7155 if (mddev
->safemode
&&
7156 !atomic_read(&mddev
->writes_pending
) &&
7158 mddev
->recovery_cp
== MaxSector
) {
7161 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7163 if (mddev
->safemode
== 1)
7164 mddev
->safemode
= 0;
7165 spin_unlock_irq(&mddev
->write_lock
);
7167 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7171 md_update_sb(mddev
, 0);
7173 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7174 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7175 /* resync/recovery still happening */
7176 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7179 if (mddev
->sync_thread
) {
7180 reap_sync_thread(mddev
);
7183 /* Set RUNNING before clearing NEEDED to avoid
7184 * any transients in the value of "sync_action".
7186 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7187 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7188 /* Clear some bits that don't mean anything, but
7191 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7192 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7194 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7196 /* no recovery is running.
7197 * remove any failed drives, then
7198 * add spares if possible.
7199 * Spare are also removed and re-added, to allow
7200 * the personality to fail the re-add.
7203 if (mddev
->reshape_position
!= MaxSector
) {
7204 if (mddev
->pers
->check_reshape
== NULL
||
7205 mddev
->pers
->check_reshape(mddev
) != 0)
7206 /* Cannot proceed */
7208 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7209 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7210 } else if ((spares
= remove_and_add_spares(mddev
))) {
7211 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7212 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7213 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7214 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7215 } else if (mddev
->recovery_cp
< MaxSector
) {
7216 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7217 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7218 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7219 /* nothing to be done ... */
7222 if (mddev
->pers
->sync_request
) {
7223 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7224 /* We are adding a device or devices to an array
7225 * which has the bitmap stored on all devices.
7226 * So make sure all bitmap pages get written
7228 bitmap_write_all(mddev
->bitmap
);
7230 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7233 if (!mddev
->sync_thread
) {
7234 printk(KERN_ERR
"%s: could not start resync"
7237 /* leave the spares where they are, it shouldn't hurt */
7238 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7239 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7240 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7241 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7242 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7244 md_wakeup_thread(mddev
->sync_thread
);
7245 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7246 md_new_event(mddev
);
7249 if (!mddev
->sync_thread
) {
7250 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7251 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7253 if (mddev
->sysfs_action
)
7254 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7256 mddev_unlock(mddev
);
7260 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7262 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7263 wait_event_timeout(rdev
->blocked_wait
,
7264 !test_bit(Blocked
, &rdev
->flags
),
7265 msecs_to_jiffies(5000));
7266 rdev_dec_pending(rdev
, mddev
);
7268 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7270 static int md_notify_reboot(struct notifier_block
*this,
7271 unsigned long code
, void *x
)
7273 struct list_head
*tmp
;
7276 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7278 printk(KERN_INFO
"md: stopping all md devices.\n");
7280 for_each_mddev(mddev
, tmp
)
7281 if (mddev_trylock(mddev
)) {
7282 /* Force a switch to readonly even array
7283 * appears to still be in use. Hence
7286 md_set_readonly(mddev
, 100);
7287 mddev_unlock(mddev
);
7290 * certain more exotic SCSI devices are known to be
7291 * volatile wrt too early system reboots. While the
7292 * right place to handle this issue is the given
7293 * driver, we do want to have a safe RAID driver ...
7300 static struct notifier_block md_notifier
= {
7301 .notifier_call
= md_notify_reboot
,
7303 .priority
= INT_MAX
, /* before any real devices */
7306 static void md_geninit(void)
7308 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7310 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7313 static int __init
md_init(void)
7317 md_wq
= alloc_workqueue("md", WQ_RESCUER
, 0);
7321 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
7325 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
7328 if ((ret
= register_blkdev(0, "mdp")) < 0)
7332 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7333 md_probe
, NULL
, NULL
);
7334 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7335 md_probe
, NULL
, NULL
);
7337 register_reboot_notifier(&md_notifier
);
7338 raid_table_header
= register_sysctl_table(raid_root_table
);
7344 unregister_blkdev(MD_MAJOR
, "md");
7346 destroy_workqueue(md_misc_wq
);
7348 destroy_workqueue(md_wq
);
7356 * Searches all registered partitions for autorun RAID arrays
7360 static LIST_HEAD(all_detected_devices
);
7361 struct detected_devices_node
{
7362 struct list_head list
;
7366 void md_autodetect_dev(dev_t dev
)
7368 struct detected_devices_node
*node_detected_dev
;
7370 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7371 if (node_detected_dev
) {
7372 node_detected_dev
->dev
= dev
;
7373 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7375 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7376 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7381 static void autostart_arrays(int part
)
7384 struct detected_devices_node
*node_detected_dev
;
7386 int i_scanned
, i_passed
;
7391 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7393 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7395 node_detected_dev
= list_entry(all_detected_devices
.next
,
7396 struct detected_devices_node
, list
);
7397 list_del(&node_detected_dev
->list
);
7398 dev
= node_detected_dev
->dev
;
7399 kfree(node_detected_dev
);
7400 rdev
= md_import_device(dev
,0, 90);
7404 if (test_bit(Faulty
, &rdev
->flags
)) {
7408 set_bit(AutoDetected
, &rdev
->flags
);
7409 list_add(&rdev
->same_set
, &pending_raid_disks
);
7413 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7414 i_scanned
, i_passed
);
7416 autorun_devices(part
);
7419 #endif /* !MODULE */
7421 static __exit
void md_exit(void)
7424 struct list_head
*tmp
;
7426 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7427 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7429 unregister_blkdev(MD_MAJOR
,"md");
7430 unregister_blkdev(mdp_major
, "mdp");
7431 unregister_reboot_notifier(&md_notifier
);
7432 unregister_sysctl_table(raid_table_header
);
7433 remove_proc_entry("mdstat", NULL
);
7434 for_each_mddev(mddev
, tmp
) {
7435 export_array(mddev
);
7436 mddev
->hold_active
= 0;
7438 destroy_workqueue(md_misc_wq
);
7439 destroy_workqueue(md_wq
);
7442 subsys_initcall(md_init
);
7443 module_exit(md_exit
)
7445 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7447 return sprintf(buffer
, "%d", start_readonly
);
7449 static int set_ro(const char *val
, struct kernel_param
*kp
)
7452 int num
= simple_strtoul(val
, &e
, 10);
7453 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7454 start_readonly
= num
;
7460 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7461 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7463 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7465 EXPORT_SYMBOL(register_md_personality
);
7466 EXPORT_SYMBOL(unregister_md_personality
);
7467 EXPORT_SYMBOL(md_error
);
7468 EXPORT_SYMBOL(md_done_sync
);
7469 EXPORT_SYMBOL(md_write_start
);
7470 EXPORT_SYMBOL(md_write_end
);
7471 EXPORT_SYMBOL(md_register_thread
);
7472 EXPORT_SYMBOL(md_unregister_thread
);
7473 EXPORT_SYMBOL(md_wakeup_thread
);
7474 EXPORT_SYMBOL(md_check_recovery
);
7475 MODULE_LICENSE("GPL");
7476 MODULE_DESCRIPTION("MD RAID framework");
7478 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);