2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
48 #include <linux/raid/md_p.h>
49 #include <linux/raid/md_u.h>
54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
58 static void autostart_arrays(int part
);
61 static LIST_HEAD(pers_list
);
62 static DEFINE_SPINLOCK(pers_lock
);
64 static void md_print_devices(void);
66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
71 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
72 * is 1000 KB/sec, so the extra system load does not show up that much.
73 * Increase it if you want to have more _guaranteed_ speed. Note that
74 * the RAID driver will use the maximum available bandwidth if the IO
75 * subsystem is idle. There is also an 'absolute maximum' reconstruction
76 * speed limit - in case reconstruction slows down your system despite
79 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
80 * or /sys/block/mdX/md/sync_speed_{min,max}
83 static int sysctl_speed_limit_min
= 1000;
84 static int sysctl_speed_limit_max
= 200000;
85 static inline int speed_min(mddev_t
*mddev
)
87 return mddev
->sync_speed_min
?
88 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
91 static inline int speed_max(mddev_t
*mddev
)
93 return mddev
->sync_speed_max
?
94 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
97 static struct ctl_table_header
*raid_table_header
;
99 static ctl_table raid_table
[] = {
101 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
102 .procname
= "speed_limit_min",
103 .data
= &sysctl_speed_limit_min
,
104 .maxlen
= sizeof(int),
105 .mode
= S_IRUGO
|S_IWUSR
,
106 .proc_handler
= &proc_dointvec
,
109 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
110 .procname
= "speed_limit_max",
111 .data
= &sysctl_speed_limit_max
,
112 .maxlen
= sizeof(int),
113 .mode
= S_IRUGO
|S_IWUSR
,
114 .proc_handler
= &proc_dointvec
,
119 static ctl_table raid_dir_table
[] = {
121 .ctl_name
= DEV_RAID
,
124 .mode
= S_IRUGO
|S_IXUGO
,
130 static ctl_table raid_root_table
[] = {
136 .child
= raid_dir_table
,
141 static struct block_device_operations md_fops
;
143 static int start_readonly
;
146 * We have a system wide 'event count' that is incremented
147 * on any 'interesting' event, and readers of /proc/mdstat
148 * can use 'poll' or 'select' to find out when the event
152 * start array, stop array, error, add device, remove device,
153 * start build, activate spare
155 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
156 static atomic_t md_event_count
;
157 void md_new_event(mddev_t
*mddev
)
159 atomic_inc(&md_event_count
);
160 wake_up(&md_event_waiters
);
162 EXPORT_SYMBOL_GPL(md_new_event
);
164 /* Alternate version that can be called from interrupts
165 * when calling sysfs_notify isn't needed.
167 static void md_new_event_inintr(mddev_t
*mddev
)
169 atomic_inc(&md_event_count
);
170 wake_up(&md_event_waiters
);
174 * Enables to iterate over all existing md arrays
175 * all_mddevs_lock protects this list.
177 static LIST_HEAD(all_mddevs
);
178 static DEFINE_SPINLOCK(all_mddevs_lock
);
182 * iterates through all used mddevs in the system.
183 * We take care to grab the all_mddevs_lock whenever navigating
184 * the list, and to always hold a refcount when unlocked.
185 * Any code which breaks out of this loop while own
186 * a reference to the current mddev and must mddev_put it.
188 #define for_each_mddev(mddev,tmp) \
190 for (({ spin_lock(&all_mddevs_lock); \
191 tmp = all_mddevs.next; \
193 ({ if (tmp != &all_mddevs) \
194 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
195 spin_unlock(&all_mddevs_lock); \
196 if (mddev) mddev_put(mddev); \
197 mddev = list_entry(tmp, mddev_t, all_mddevs); \
198 tmp != &all_mddevs;}); \
199 ({ spin_lock(&all_mddevs_lock); \
204 /* Rather than calling directly into the personality make_request function,
205 * IO requests come here first so that we can check if the device is
206 * being suspended pending a reconfiguration.
207 * We hold a refcount over the call to ->make_request. By the time that
208 * call has finished, the bio has been linked into some internal structure
209 * and so is visible to ->quiesce(), so we don't need the refcount any more.
211 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
213 mddev_t
*mddev
= q
->queuedata
;
215 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
220 if (mddev
->suspended
) {
223 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
224 TASK_UNINTERRUPTIBLE
);
225 if (!mddev
->suspended
)
231 finish_wait(&mddev
->sb_wait
, &__wait
);
233 atomic_inc(&mddev
->active_io
);
235 rv
= mddev
->pers
->make_request(q
, bio
);
236 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
237 wake_up(&mddev
->sb_wait
);
242 static void mddev_suspend(mddev_t
*mddev
)
244 BUG_ON(mddev
->suspended
);
245 mddev
->suspended
= 1;
247 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
248 mddev
->pers
->quiesce(mddev
, 1);
249 md_unregister_thread(mddev
->thread
);
250 mddev
->thread
= NULL
;
251 /* we now know that no code is executing in the personality module,
252 * except possibly the tail end of a ->bi_end_io function, but that
253 * is certain to complete before the module has a chance to get
258 static void mddev_resume(mddev_t
*mddev
)
260 mddev
->suspended
= 0;
261 wake_up(&mddev
->sb_wait
);
262 mddev
->pers
->quiesce(mddev
, 0);
266 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
268 atomic_inc(&mddev
->active
);
272 static void mddev_delayed_delete(struct work_struct
*ws
)
274 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
275 kobject_del(&mddev
->kobj
);
276 kobject_put(&mddev
->kobj
);
279 static void mddev_put(mddev_t
*mddev
)
281 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
283 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
284 !mddev
->hold_active
) {
285 list_del(&mddev
->all_mddevs
);
286 if (mddev
->gendisk
) {
287 /* we did a probe so need to clean up.
288 * Call schedule_work inside the spinlock
289 * so that flush_scheduled_work() after
290 * mddev_find will succeed in waiting for the
293 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
294 schedule_work(&mddev
->del_work
);
298 spin_unlock(&all_mddevs_lock
);
301 static mddev_t
* mddev_find(dev_t unit
)
303 mddev_t
*mddev
, *new = NULL
;
306 spin_lock(&all_mddevs_lock
);
309 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
310 if (mddev
->unit
== unit
) {
312 spin_unlock(&all_mddevs_lock
);
318 list_add(&new->all_mddevs
, &all_mddevs
);
319 spin_unlock(&all_mddevs_lock
);
320 new->hold_active
= UNTIL_IOCTL
;
324 /* find an unused unit number */
325 static int next_minor
= 512;
326 int start
= next_minor
;
330 dev
= MKDEV(MD_MAJOR
, next_minor
);
332 if (next_minor
> MINORMASK
)
334 if (next_minor
== start
) {
335 /* Oh dear, all in use. */
336 spin_unlock(&all_mddevs_lock
);
342 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
343 if (mddev
->unit
== dev
) {
349 new->md_minor
= MINOR(dev
);
350 new->hold_active
= UNTIL_STOP
;
351 list_add(&new->all_mddevs
, &all_mddevs
);
352 spin_unlock(&all_mddevs_lock
);
355 spin_unlock(&all_mddevs_lock
);
357 new = kzalloc(sizeof(*new), GFP_KERNEL
);
362 if (MAJOR(unit
) == MD_MAJOR
)
363 new->md_minor
= MINOR(unit
);
365 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
367 mutex_init(&new->reconfig_mutex
);
368 INIT_LIST_HEAD(&new->disks
);
369 INIT_LIST_HEAD(&new->all_mddevs
);
370 init_timer(&new->safemode_timer
);
371 atomic_set(&new->active
, 1);
372 atomic_set(&new->openers
, 0);
373 atomic_set(&new->active_io
, 0);
374 spin_lock_init(&new->write_lock
);
375 init_waitqueue_head(&new->sb_wait
);
376 init_waitqueue_head(&new->recovery_wait
);
377 new->reshape_position
= MaxSector
;
379 new->resync_max
= MaxSector
;
380 new->level
= LEVEL_NONE
;
385 static inline int mddev_lock(mddev_t
* mddev
)
387 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
390 static inline int mddev_trylock(mddev_t
* mddev
)
392 return mutex_trylock(&mddev
->reconfig_mutex
);
395 static inline void mddev_unlock(mddev_t
* mddev
)
397 mutex_unlock(&mddev
->reconfig_mutex
);
399 md_wakeup_thread(mddev
->thread
);
402 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
406 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
407 if (rdev
->desc_nr
== nr
)
413 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
417 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
418 if (rdev
->bdev
->bd_dev
== dev
)
424 static struct mdk_personality
*find_pers(int level
, char *clevel
)
426 struct mdk_personality
*pers
;
427 list_for_each_entry(pers
, &pers_list
, list
) {
428 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
430 if (strcmp(pers
->name
, clevel
)==0)
436 /* return the offset of the super block in 512byte sectors */
437 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
439 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
440 return MD_NEW_SIZE_SECTORS(num_sectors
);
443 static sector_t
calc_num_sectors(mdk_rdev_t
*rdev
, unsigned chunk_size
)
445 sector_t num_sectors
= rdev
->sb_start
;
448 num_sectors
&= ~((sector_t
)chunk_size
/512 - 1);
452 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
457 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
458 if (!rdev
->sb_page
) {
459 printk(KERN_ALERT
"md: out of memory.\n");
466 static void free_disk_sb(mdk_rdev_t
* rdev
)
469 put_page(rdev
->sb_page
);
471 rdev
->sb_page
= NULL
;
478 static void super_written(struct bio
*bio
, int error
)
480 mdk_rdev_t
*rdev
= bio
->bi_private
;
481 mddev_t
*mddev
= rdev
->mddev
;
483 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
484 printk("md: super_written gets error=%d, uptodate=%d\n",
485 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
486 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
487 md_error(mddev
, rdev
);
490 if (atomic_dec_and_test(&mddev
->pending_writes
))
491 wake_up(&mddev
->sb_wait
);
495 static void super_written_barrier(struct bio
*bio
, int error
)
497 struct bio
*bio2
= bio
->bi_private
;
498 mdk_rdev_t
*rdev
= bio2
->bi_private
;
499 mddev_t
*mddev
= rdev
->mddev
;
501 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
502 error
== -EOPNOTSUPP
) {
504 /* barriers don't appear to be supported :-( */
505 set_bit(BarriersNotsupp
, &rdev
->flags
);
506 mddev
->barriers_work
= 0;
507 spin_lock_irqsave(&mddev
->write_lock
, flags
);
508 bio2
->bi_next
= mddev
->biolist
;
509 mddev
->biolist
= bio2
;
510 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
511 wake_up(&mddev
->sb_wait
);
515 bio
->bi_private
= rdev
;
516 super_written(bio
, error
);
520 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
521 sector_t sector
, int size
, struct page
*page
)
523 /* write first size bytes of page to sector of rdev
524 * Increment mddev->pending_writes before returning
525 * and decrement it on completion, waking up sb_wait
526 * if zero is reached.
527 * If an error occurred, call md_error
529 * As we might need to resubmit the request if BIO_RW_BARRIER
530 * causes ENOTSUPP, we allocate a spare bio...
532 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
533 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNCIO
) | (1<<BIO_RW_UNPLUG
);
535 bio
->bi_bdev
= rdev
->bdev
;
536 bio
->bi_sector
= sector
;
537 bio_add_page(bio
, page
, size
, 0);
538 bio
->bi_private
= rdev
;
539 bio
->bi_end_io
= super_written
;
542 atomic_inc(&mddev
->pending_writes
);
543 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
545 rw
|= (1<<BIO_RW_BARRIER
);
546 rbio
= bio_clone(bio
, GFP_NOIO
);
547 rbio
->bi_private
= bio
;
548 rbio
->bi_end_io
= super_written_barrier
;
549 submit_bio(rw
, rbio
);
554 void md_super_wait(mddev_t
*mddev
)
556 /* wait for all superblock writes that were scheduled to complete.
557 * if any had to be retried (due to BARRIER problems), retry them
561 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
562 if (atomic_read(&mddev
->pending_writes
)==0)
564 while (mddev
->biolist
) {
566 spin_lock_irq(&mddev
->write_lock
);
567 bio
= mddev
->biolist
;
568 mddev
->biolist
= bio
->bi_next
;
570 spin_unlock_irq(&mddev
->write_lock
);
571 submit_bio(bio
->bi_rw
, bio
);
575 finish_wait(&mddev
->sb_wait
, &wq
);
578 static void bi_complete(struct bio
*bio
, int error
)
580 complete((struct completion
*)bio
->bi_private
);
583 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
584 struct page
*page
, int rw
)
586 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
587 struct completion event
;
590 rw
|= (1 << BIO_RW_SYNCIO
) | (1 << BIO_RW_UNPLUG
);
593 bio
->bi_sector
= sector
;
594 bio_add_page(bio
, page
, size
, 0);
595 init_completion(&event
);
596 bio
->bi_private
= &event
;
597 bio
->bi_end_io
= bi_complete
;
599 wait_for_completion(&event
);
601 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
605 EXPORT_SYMBOL_GPL(sync_page_io
);
607 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
609 char b
[BDEVNAME_SIZE
];
610 if (!rdev
->sb_page
) {
618 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
624 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
625 bdevname(rdev
->bdev
,b
));
629 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
631 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
632 sb1
->set_uuid1
== sb2
->set_uuid1
&&
633 sb1
->set_uuid2
== sb2
->set_uuid2
&&
634 sb1
->set_uuid3
== sb2
->set_uuid3
;
637 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
640 mdp_super_t
*tmp1
, *tmp2
;
642 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
643 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
645 if (!tmp1
|| !tmp2
) {
647 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
655 * nr_disks is not constant
660 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
668 static u32
md_csum_fold(u32 csum
)
670 csum
= (csum
& 0xffff) + (csum
>> 16);
671 return (csum
& 0xffff) + (csum
>> 16);
674 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
677 u32
*sb32
= (u32
*)sb
;
679 unsigned int disk_csum
, csum
;
681 disk_csum
= sb
->sb_csum
;
684 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
686 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
690 /* This used to use csum_partial, which was wrong for several
691 * reasons including that different results are returned on
692 * different architectures. It isn't critical that we get exactly
693 * the same return value as before (we always csum_fold before
694 * testing, and that removes any differences). However as we
695 * know that csum_partial always returned a 16bit value on
696 * alphas, do a fold to maximise conformity to previous behaviour.
698 sb
->sb_csum
= md_csum_fold(disk_csum
);
700 sb
->sb_csum
= disk_csum
;
707 * Handle superblock details.
708 * We want to be able to handle multiple superblock formats
709 * so we have a common interface to them all, and an array of
710 * different handlers.
711 * We rely on user-space to write the initial superblock, and support
712 * reading and updating of superblocks.
713 * Interface methods are:
714 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
715 * loads and validates a superblock on dev.
716 * if refdev != NULL, compare superblocks on both devices
718 * 0 - dev has a superblock that is compatible with refdev
719 * 1 - dev has a superblock that is compatible and newer than refdev
720 * so dev should be used as the refdev in future
721 * -EINVAL superblock incompatible or invalid
722 * -othererror e.g. -EIO
724 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
725 * Verify that dev is acceptable into mddev.
726 * The first time, mddev->raid_disks will be 0, and data from
727 * dev should be merged in. Subsequent calls check that dev
728 * is new enough. Return 0 or -EINVAL
730 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
731 * Update the superblock for rdev with data in mddev
732 * This does not write to disc.
738 struct module
*owner
;
739 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
741 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
742 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
743 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
744 sector_t num_sectors
);
748 * load_super for 0.90.0
750 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
752 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
757 * Calculate the position of the superblock (512byte sectors),
758 * it's at the end of the disk.
760 * It also happens to be a multiple of 4Kb.
762 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
764 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
769 bdevname(rdev
->bdev
, b
);
770 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
772 if (sb
->md_magic
!= MD_SB_MAGIC
) {
773 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
778 if (sb
->major_version
!= 0 ||
779 sb
->minor_version
< 90 ||
780 sb
->minor_version
> 91) {
781 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
782 sb
->major_version
, sb
->minor_version
,
787 if (sb
->raid_disks
<= 0)
790 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
791 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
796 rdev
->preferred_minor
= sb
->md_minor
;
797 rdev
->data_offset
= 0;
798 rdev
->sb_size
= MD_SB_BYTES
;
800 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
801 if (sb
->level
!= 1 && sb
->level
!= 4
802 && sb
->level
!= 5 && sb
->level
!= 6
803 && sb
->level
!= 10) {
804 /* FIXME use a better test */
806 "md: bitmaps not supported for this level.\n");
811 if (sb
->level
== LEVEL_MULTIPATH
)
814 rdev
->desc_nr
= sb
->this_disk
.number
;
820 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
821 if (!uuid_equal(refsb
, sb
)) {
822 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
823 b
, bdevname(refdev
->bdev
,b2
));
826 if (!sb_equal(refsb
, sb
)) {
827 printk(KERN_WARNING
"md: %s has same UUID"
828 " but different superblock to %s\n",
829 b
, bdevname(refdev
->bdev
, b2
));
833 ev2
= md_event(refsb
);
839 rdev
->sectors
= calc_num_sectors(rdev
, sb
->chunk_size
);
841 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
842 /* "this cannot possibly happen" ... */
850 * validate_super for 0.90.0
852 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
855 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
856 __u64 ev1
= md_event(sb
);
858 rdev
->raid_disk
= -1;
859 clear_bit(Faulty
, &rdev
->flags
);
860 clear_bit(In_sync
, &rdev
->flags
);
861 clear_bit(WriteMostly
, &rdev
->flags
);
862 clear_bit(BarriersNotsupp
, &rdev
->flags
);
864 if (mddev
->raid_disks
== 0) {
865 mddev
->major_version
= 0;
866 mddev
->minor_version
= sb
->minor_version
;
867 mddev
->patch_version
= sb
->patch_version
;
869 mddev
->chunk_size
= sb
->chunk_size
;
870 mddev
->ctime
= sb
->ctime
;
871 mddev
->utime
= sb
->utime
;
872 mddev
->level
= sb
->level
;
873 mddev
->clevel
[0] = 0;
874 mddev
->layout
= sb
->layout
;
875 mddev
->raid_disks
= sb
->raid_disks
;
876 mddev
->dev_sectors
= sb
->size
* 2;
878 mddev
->bitmap_offset
= 0;
879 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
881 if (mddev
->minor_version
>= 91) {
882 mddev
->reshape_position
= sb
->reshape_position
;
883 mddev
->delta_disks
= sb
->delta_disks
;
884 mddev
->new_level
= sb
->new_level
;
885 mddev
->new_layout
= sb
->new_layout
;
886 mddev
->new_chunk
= sb
->new_chunk
;
888 mddev
->reshape_position
= MaxSector
;
889 mddev
->delta_disks
= 0;
890 mddev
->new_level
= mddev
->level
;
891 mddev
->new_layout
= mddev
->layout
;
892 mddev
->new_chunk
= mddev
->chunk_size
;
895 if (sb
->state
& (1<<MD_SB_CLEAN
))
896 mddev
->recovery_cp
= MaxSector
;
898 if (sb
->events_hi
== sb
->cp_events_hi
&&
899 sb
->events_lo
== sb
->cp_events_lo
) {
900 mddev
->recovery_cp
= sb
->recovery_cp
;
902 mddev
->recovery_cp
= 0;
905 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
906 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
907 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
908 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
910 mddev
->max_disks
= MD_SB_DISKS
;
912 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
913 mddev
->bitmap_file
== NULL
)
914 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
916 } else if (mddev
->pers
== NULL
) {
917 /* Insist on good event counter while assembling */
919 if (ev1
< mddev
->events
)
921 } else if (mddev
->bitmap
) {
922 /* if adding to array with a bitmap, then we can accept an
923 * older device ... but not too old.
925 if (ev1
< mddev
->bitmap
->events_cleared
)
928 if (ev1
< mddev
->events
)
929 /* just a hot-add of a new device, leave raid_disk at -1 */
933 if (mddev
->level
!= LEVEL_MULTIPATH
) {
934 desc
= sb
->disks
+ rdev
->desc_nr
;
936 if (desc
->state
& (1<<MD_DISK_FAULTY
))
937 set_bit(Faulty
, &rdev
->flags
);
938 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
939 desc->raid_disk < mddev->raid_disks */) {
940 set_bit(In_sync
, &rdev
->flags
);
941 rdev
->raid_disk
= desc
->raid_disk
;
943 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
944 set_bit(WriteMostly
, &rdev
->flags
);
945 } else /* MULTIPATH are always insync */
946 set_bit(In_sync
, &rdev
->flags
);
951 * sync_super for 0.90.0
953 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
957 int next_spare
= mddev
->raid_disks
;
960 /* make rdev->sb match mddev data..
963 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
964 * 3/ any empty disks < next_spare become removed
966 * disks[0] gets initialised to REMOVED because
967 * we cannot be sure from other fields if it has
968 * been initialised or not.
971 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
973 rdev
->sb_size
= MD_SB_BYTES
;
975 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
977 memset(sb
, 0, sizeof(*sb
));
979 sb
->md_magic
= MD_SB_MAGIC
;
980 sb
->major_version
= mddev
->major_version
;
981 sb
->patch_version
= mddev
->patch_version
;
982 sb
->gvalid_words
= 0; /* ignored */
983 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
984 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
985 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
986 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
988 sb
->ctime
= mddev
->ctime
;
989 sb
->level
= mddev
->level
;
990 sb
->size
= mddev
->dev_sectors
/ 2;
991 sb
->raid_disks
= mddev
->raid_disks
;
992 sb
->md_minor
= mddev
->md_minor
;
993 sb
->not_persistent
= 0;
994 sb
->utime
= mddev
->utime
;
996 sb
->events_hi
= (mddev
->events
>>32);
997 sb
->events_lo
= (u32
)mddev
->events
;
999 if (mddev
->reshape_position
== MaxSector
)
1000 sb
->minor_version
= 90;
1002 sb
->minor_version
= 91;
1003 sb
->reshape_position
= mddev
->reshape_position
;
1004 sb
->new_level
= mddev
->new_level
;
1005 sb
->delta_disks
= mddev
->delta_disks
;
1006 sb
->new_layout
= mddev
->new_layout
;
1007 sb
->new_chunk
= mddev
->new_chunk
;
1009 mddev
->minor_version
= sb
->minor_version
;
1012 sb
->recovery_cp
= mddev
->recovery_cp
;
1013 sb
->cp_events_hi
= (mddev
->events
>>32);
1014 sb
->cp_events_lo
= (u32
)mddev
->events
;
1015 if (mddev
->recovery_cp
== MaxSector
)
1016 sb
->state
= (1<< MD_SB_CLEAN
);
1018 sb
->recovery_cp
= 0;
1020 sb
->layout
= mddev
->layout
;
1021 sb
->chunk_size
= mddev
->chunk_size
;
1023 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
1024 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1026 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1027 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1030 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
1031 && !test_bit(Faulty
, &rdev2
->flags
))
1032 desc_nr
= rdev2
->raid_disk
;
1034 desc_nr
= next_spare
++;
1035 rdev2
->desc_nr
= desc_nr
;
1036 d
= &sb
->disks
[rdev2
->desc_nr
];
1038 d
->number
= rdev2
->desc_nr
;
1039 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1040 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1041 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
1042 && !test_bit(Faulty
, &rdev2
->flags
))
1043 d
->raid_disk
= rdev2
->raid_disk
;
1045 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1046 if (test_bit(Faulty
, &rdev2
->flags
))
1047 d
->state
= (1<<MD_DISK_FAULTY
);
1048 else if (test_bit(In_sync
, &rdev2
->flags
)) {
1049 d
->state
= (1<<MD_DISK_ACTIVE
);
1050 d
->state
|= (1<<MD_DISK_SYNC
);
1058 if (test_bit(WriteMostly
, &rdev2
->flags
))
1059 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1061 /* now set the "removed" and "faulty" bits on any missing devices */
1062 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1063 mdp_disk_t
*d
= &sb
->disks
[i
];
1064 if (d
->state
== 0 && d
->number
== 0) {
1067 d
->state
= (1<<MD_DISK_REMOVED
);
1068 d
->state
|= (1<<MD_DISK_FAULTY
);
1072 sb
->nr_disks
= nr_disks
;
1073 sb
->active_disks
= active
;
1074 sb
->working_disks
= working
;
1075 sb
->failed_disks
= failed
;
1076 sb
->spare_disks
= spare
;
1078 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1079 sb
->sb_csum
= calc_sb_csum(sb
);
1083 * rdev_size_change for 0.90.0
1085 static unsigned long long
1086 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1088 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1089 return 0; /* component must fit device */
1090 if (rdev
->mddev
->bitmap_offset
)
1091 return 0; /* can't move bitmap */
1092 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1093 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1094 num_sectors
= rdev
->sb_start
;
1095 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1097 md_super_wait(rdev
->mddev
);
1098 return num_sectors
/ 2; /* kB for sysfs */
1103 * version 1 superblock
1106 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1110 unsigned long long newcsum
;
1111 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1112 __le32
*isuper
= (__le32
*)sb
;
1115 disk_csum
= sb
->sb_csum
;
1118 for (i
=0; size
>=4; size
-= 4 )
1119 newcsum
+= le32_to_cpu(*isuper
++);
1122 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1124 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1125 sb
->sb_csum
= disk_csum
;
1126 return cpu_to_le32(csum
);
1129 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1131 struct mdp_superblock_1
*sb
;
1134 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1138 * Calculate the position of the superblock in 512byte sectors.
1139 * It is always aligned to a 4K boundary and
1140 * depeding on minor_version, it can be:
1141 * 0: At least 8K, but less than 12K, from end of device
1142 * 1: At start of device
1143 * 2: 4K from start of device.
1145 switch(minor_version
) {
1147 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1149 sb_start
&= ~(sector_t
)(4*2-1);
1160 rdev
->sb_start
= sb_start
;
1162 /* superblock is rarely larger than 1K, but it can be larger,
1163 * and it is safe to read 4k, so we do that
1165 ret
= read_disk_sb(rdev
, 4096);
1166 if (ret
) return ret
;
1169 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1171 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1172 sb
->major_version
!= cpu_to_le32(1) ||
1173 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1174 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1175 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1178 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1179 printk("md: invalid superblock checksum on %s\n",
1180 bdevname(rdev
->bdev
,b
));
1183 if (le64_to_cpu(sb
->data_size
) < 10) {
1184 printk("md: data_size too small on %s\n",
1185 bdevname(rdev
->bdev
,b
));
1188 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1189 if (sb
->level
!= cpu_to_le32(1) &&
1190 sb
->level
!= cpu_to_le32(4) &&
1191 sb
->level
!= cpu_to_le32(5) &&
1192 sb
->level
!= cpu_to_le32(6) &&
1193 sb
->level
!= cpu_to_le32(10)) {
1195 "md: bitmaps not supported for this level.\n");
1200 rdev
->preferred_minor
= 0xffff;
1201 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1202 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1204 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1205 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1206 if (rdev
->sb_size
& bmask
)
1207 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1210 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1213 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1216 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1222 struct mdp_superblock_1
*refsb
=
1223 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1225 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1226 sb
->level
!= refsb
->level
||
1227 sb
->layout
!= refsb
->layout
||
1228 sb
->chunksize
!= refsb
->chunksize
) {
1229 printk(KERN_WARNING
"md: %s has strangely different"
1230 " superblock to %s\n",
1231 bdevname(rdev
->bdev
,b
),
1232 bdevname(refdev
->bdev
,b2
));
1235 ev1
= le64_to_cpu(sb
->events
);
1236 ev2
= le64_to_cpu(refsb
->events
);
1244 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1245 le64_to_cpu(sb
->data_offset
);
1247 rdev
->sectors
= rdev
->sb_start
;
1248 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1250 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1251 if (le32_to_cpu(sb
->chunksize
))
1252 rdev
->sectors
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
) - 1);
1254 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1259 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1261 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1262 __u64 ev1
= le64_to_cpu(sb
->events
);
1264 rdev
->raid_disk
= -1;
1265 clear_bit(Faulty
, &rdev
->flags
);
1266 clear_bit(In_sync
, &rdev
->flags
);
1267 clear_bit(WriteMostly
, &rdev
->flags
);
1268 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1270 if (mddev
->raid_disks
== 0) {
1271 mddev
->major_version
= 1;
1272 mddev
->patch_version
= 0;
1273 mddev
->external
= 0;
1274 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1275 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1276 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1277 mddev
->level
= le32_to_cpu(sb
->level
);
1278 mddev
->clevel
[0] = 0;
1279 mddev
->layout
= le32_to_cpu(sb
->layout
);
1280 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1281 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1282 mddev
->events
= ev1
;
1283 mddev
->bitmap_offset
= 0;
1284 mddev
->default_bitmap_offset
= 1024 >> 9;
1286 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1287 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1289 mddev
->max_disks
= (4096-256)/2;
1291 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1292 mddev
->bitmap_file
== NULL
)
1293 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1295 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1296 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1297 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1298 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1299 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1300 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1302 mddev
->reshape_position
= MaxSector
;
1303 mddev
->delta_disks
= 0;
1304 mddev
->new_level
= mddev
->level
;
1305 mddev
->new_layout
= mddev
->layout
;
1306 mddev
->new_chunk
= mddev
->chunk_size
;
1309 } else if (mddev
->pers
== NULL
) {
1310 /* Insist of good event counter while assembling */
1312 if (ev1
< mddev
->events
)
1314 } else if (mddev
->bitmap
) {
1315 /* If adding to array with a bitmap, then we can accept an
1316 * older device, but not too old.
1318 if (ev1
< mddev
->bitmap
->events_cleared
)
1321 if (ev1
< mddev
->events
)
1322 /* just a hot-add of a new device, leave raid_disk at -1 */
1325 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1327 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1329 case 0xffff: /* spare */
1331 case 0xfffe: /* faulty */
1332 set_bit(Faulty
, &rdev
->flags
);
1335 if ((le32_to_cpu(sb
->feature_map
) &
1336 MD_FEATURE_RECOVERY_OFFSET
))
1337 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1339 set_bit(In_sync
, &rdev
->flags
);
1340 rdev
->raid_disk
= role
;
1343 if (sb
->devflags
& WriteMostly1
)
1344 set_bit(WriteMostly
, &rdev
->flags
);
1345 } else /* MULTIPATH are always insync */
1346 set_bit(In_sync
, &rdev
->flags
);
1351 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1353 struct mdp_superblock_1
*sb
;
1356 /* make rdev->sb match mddev and rdev data. */
1358 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1360 sb
->feature_map
= 0;
1362 sb
->recovery_offset
= cpu_to_le64(0);
1363 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1364 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1365 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1367 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1368 sb
->events
= cpu_to_le64(mddev
->events
);
1370 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1372 sb
->resync_offset
= cpu_to_le64(0);
1374 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1376 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1377 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1379 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1380 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1381 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1384 if (rdev
->raid_disk
>= 0 &&
1385 !test_bit(In_sync
, &rdev
->flags
)) {
1386 if (mddev
->curr_resync_completed
> rdev
->recovery_offset
)
1387 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
1388 if (rdev
->recovery_offset
> 0) {
1390 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1391 sb
->recovery_offset
=
1392 cpu_to_le64(rdev
->recovery_offset
);
1396 if (mddev
->reshape_position
!= MaxSector
) {
1397 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1398 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1399 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1400 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1401 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1402 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1406 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1407 if (rdev2
->desc_nr
+1 > max_dev
)
1408 max_dev
= rdev2
->desc_nr
+1;
1410 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1411 sb
->max_dev
= cpu_to_le32(max_dev
);
1412 for (i
=0; i
<max_dev
;i
++)
1413 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1415 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1417 if (test_bit(Faulty
, &rdev2
->flags
))
1418 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1419 else if (test_bit(In_sync
, &rdev2
->flags
))
1420 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1421 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1422 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1424 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1427 sb
->sb_csum
= calc_sb_1_csum(sb
);
1430 static unsigned long long
1431 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1433 struct mdp_superblock_1
*sb
;
1434 sector_t max_sectors
;
1435 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1436 return 0; /* component must fit device */
1437 if (rdev
->sb_start
< rdev
->data_offset
) {
1438 /* minor versions 1 and 2; superblock before data */
1439 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1440 max_sectors
-= rdev
->data_offset
;
1441 if (!num_sectors
|| num_sectors
> max_sectors
)
1442 num_sectors
= max_sectors
;
1443 } else if (rdev
->mddev
->bitmap_offset
) {
1444 /* minor version 0 with bitmap we can't move */
1447 /* minor version 0; superblock after data */
1449 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1450 sb_start
&= ~(sector_t
)(4*2 - 1);
1451 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1452 if (!num_sectors
|| num_sectors
> max_sectors
)
1453 num_sectors
= max_sectors
;
1454 rdev
->sb_start
= sb_start
;
1456 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1457 sb
->data_size
= cpu_to_le64(num_sectors
);
1458 sb
->super_offset
= rdev
->sb_start
;
1459 sb
->sb_csum
= calc_sb_1_csum(sb
);
1460 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1462 md_super_wait(rdev
->mddev
);
1463 return num_sectors
/ 2; /* kB for sysfs */
1466 static struct super_type super_types
[] = {
1469 .owner
= THIS_MODULE
,
1470 .load_super
= super_90_load
,
1471 .validate_super
= super_90_validate
,
1472 .sync_super
= super_90_sync
,
1473 .rdev_size_change
= super_90_rdev_size_change
,
1477 .owner
= THIS_MODULE
,
1478 .load_super
= super_1_load
,
1479 .validate_super
= super_1_validate
,
1480 .sync_super
= super_1_sync
,
1481 .rdev_size_change
= super_1_rdev_size_change
,
1485 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1487 mdk_rdev_t
*rdev
, *rdev2
;
1490 rdev_for_each_rcu(rdev
, mddev1
)
1491 rdev_for_each_rcu(rdev2
, mddev2
)
1492 if (rdev
->bdev
->bd_contains
==
1493 rdev2
->bdev
->bd_contains
) {
1501 static LIST_HEAD(pending_raid_disks
);
1503 static void md_integrity_check(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1505 struct mdk_personality
*pers
= mddev
->pers
;
1506 struct gendisk
*disk
= mddev
->gendisk
;
1507 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1508 struct blk_integrity
*bi_mddev
= blk_get_integrity(disk
);
1510 /* Data integrity passthrough not supported on RAID 4, 5 and 6 */
1511 if (pers
&& pers
->level
>= 4 && pers
->level
<= 6)
1514 /* If rdev is integrity capable, register profile for mddev */
1515 if (!bi_mddev
&& bi_rdev
) {
1516 if (blk_integrity_register(disk
, bi_rdev
))
1517 printk(KERN_ERR
"%s: %s Could not register integrity!\n",
1518 __func__
, disk
->disk_name
);
1520 printk(KERN_NOTICE
"Enabling data integrity on %s\n",
1525 /* Check that mddev and rdev have matching profiles */
1526 if (blk_integrity_compare(disk
, rdev
->bdev
->bd_disk
) < 0) {
1527 printk(KERN_ERR
"%s: %s/%s integrity mismatch!\n", __func__
,
1528 disk
->disk_name
, rdev
->bdev
->bd_disk
->disk_name
);
1529 printk(KERN_NOTICE
"Disabling data integrity on %s\n",
1531 blk_integrity_unregister(disk
);
1535 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1537 char b
[BDEVNAME_SIZE
];
1547 /* prevent duplicates */
1548 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1551 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1552 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1553 rdev
->sectors
< mddev
->dev_sectors
)) {
1555 /* Cannot change size, so fail
1556 * If mddev->level <= 0, then we don't care
1557 * about aligning sizes (e.g. linear)
1559 if (mddev
->level
> 0)
1562 mddev
->dev_sectors
= rdev
->sectors
;
1565 /* Verify rdev->desc_nr is unique.
1566 * If it is -1, assign a free number, else
1567 * check number is not in use
1569 if (rdev
->desc_nr
< 0) {
1571 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1572 while (find_rdev_nr(mddev
, choice
))
1574 rdev
->desc_nr
= choice
;
1576 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1579 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1580 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1581 mdname(mddev
), mddev
->max_disks
);
1584 bdevname(rdev
->bdev
,b
);
1585 while ( (s
=strchr(b
, '/')) != NULL
)
1588 rdev
->mddev
= mddev
;
1589 printk(KERN_INFO
"md: bind<%s>\n", b
);
1591 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1594 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1595 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1596 kobject_del(&rdev
->kobj
);
1599 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, "state");
1601 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1602 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1604 /* May as well allow recovery to be retried once */
1605 mddev
->recovery_disabled
= 0;
1607 md_integrity_check(rdev
, mddev
);
1611 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1616 static void md_delayed_delete(struct work_struct
*ws
)
1618 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1619 kobject_del(&rdev
->kobj
);
1620 kobject_put(&rdev
->kobj
);
1623 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1625 char b
[BDEVNAME_SIZE
];
1630 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1631 list_del_rcu(&rdev
->same_set
);
1632 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1634 sysfs_remove_link(&rdev
->kobj
, "block");
1635 sysfs_put(rdev
->sysfs_state
);
1636 rdev
->sysfs_state
= NULL
;
1637 /* We need to delay this, otherwise we can deadlock when
1638 * writing to 'remove' to "dev/state". We also need
1639 * to delay it due to rcu usage.
1642 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1643 kobject_get(&rdev
->kobj
);
1644 schedule_work(&rdev
->del_work
);
1648 * prevent the device from being mounted, repartitioned or
1649 * otherwise reused by a RAID array (or any other kernel
1650 * subsystem), by bd_claiming the device.
1652 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1655 struct block_device
*bdev
;
1656 char b
[BDEVNAME_SIZE
];
1658 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1660 printk(KERN_ERR
"md: could not open %s.\n",
1661 __bdevname(dev
, b
));
1662 return PTR_ERR(bdev
);
1664 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1666 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1668 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1672 set_bit(AllReserved
, &rdev
->flags
);
1677 static void unlock_rdev(mdk_rdev_t
*rdev
)
1679 struct block_device
*bdev
= rdev
->bdev
;
1684 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1687 void md_autodetect_dev(dev_t dev
);
1689 static void export_rdev(mdk_rdev_t
* rdev
)
1691 char b
[BDEVNAME_SIZE
];
1692 printk(KERN_INFO
"md: export_rdev(%s)\n",
1693 bdevname(rdev
->bdev
,b
));
1698 if (test_bit(AutoDetected
, &rdev
->flags
))
1699 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1702 kobject_put(&rdev
->kobj
);
1705 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1707 unbind_rdev_from_array(rdev
);
1711 static void export_array(mddev_t
*mddev
)
1713 mdk_rdev_t
*rdev
, *tmp
;
1715 rdev_for_each(rdev
, tmp
, mddev
) {
1720 kick_rdev_from_array(rdev
);
1722 if (!list_empty(&mddev
->disks
))
1724 mddev
->raid_disks
= 0;
1725 mddev
->major_version
= 0;
1728 static void print_desc(mdp_disk_t
*desc
)
1730 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1731 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1734 static void print_sb_90(mdp_super_t
*sb
)
1739 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1740 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1741 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1743 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1744 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1745 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1746 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1747 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1748 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1749 sb
->failed_disks
, sb
->spare_disks
,
1750 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1753 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1756 desc
= sb
->disks
+ i
;
1757 if (desc
->number
|| desc
->major
|| desc
->minor
||
1758 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1759 printk(" D %2d: ", i
);
1763 printk(KERN_INFO
"md: THIS: ");
1764 print_desc(&sb
->this_disk
);
1767 static void print_sb_1(struct mdp_superblock_1
*sb
)
1771 uuid
= sb
->set_uuid
;
1772 printk(KERN_INFO
"md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1773 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1774 KERN_INFO
"md: Name: \"%s\" CT:%llu\n",
1775 le32_to_cpu(sb
->major_version
),
1776 le32_to_cpu(sb
->feature_map
),
1777 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1778 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1779 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1780 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1782 (unsigned long long)le64_to_cpu(sb
->ctime
)
1783 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1785 uuid
= sb
->device_uuid
;
1786 printk(KERN_INFO
"md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1788 KERN_INFO
"md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1789 ":%02x%02x%02x%02x%02x%02x\n"
1790 KERN_INFO
"md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1791 KERN_INFO
"md: (MaxDev:%u) \n",
1792 le32_to_cpu(sb
->level
),
1793 (unsigned long long)le64_to_cpu(sb
->size
),
1794 le32_to_cpu(sb
->raid_disks
),
1795 le32_to_cpu(sb
->layout
),
1796 le32_to_cpu(sb
->chunksize
),
1797 (unsigned long long)le64_to_cpu(sb
->data_offset
),
1798 (unsigned long long)le64_to_cpu(sb
->data_size
),
1799 (unsigned long long)le64_to_cpu(sb
->super_offset
),
1800 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
1801 le32_to_cpu(sb
->dev_number
),
1802 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1803 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1804 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1805 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1807 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
1808 (unsigned long long)le64_to_cpu(sb
->events
),
1809 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
1810 le32_to_cpu(sb
->sb_csum
),
1811 le32_to_cpu(sb
->max_dev
)
1815 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
1817 char b
[BDEVNAME_SIZE
];
1818 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1819 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
1820 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1822 if (rdev
->sb_loaded
) {
1823 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
1824 switch (major_version
) {
1826 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
1829 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
1833 printk(KERN_INFO
"md: no rdev superblock!\n");
1836 static void md_print_devices(void)
1838 struct list_head
*tmp
;
1841 char b
[BDEVNAME_SIZE
];
1844 printk("md: **********************************\n");
1845 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1846 printk("md: **********************************\n");
1847 for_each_mddev(mddev
, tmp
) {
1850 bitmap_print_sb(mddev
->bitmap
);
1852 printk("%s: ", mdname(mddev
));
1853 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1854 printk("<%s>", bdevname(rdev
->bdev
,b
));
1857 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1858 print_rdev(rdev
, mddev
->major_version
);
1860 printk("md: **********************************\n");
1865 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1867 /* Update each superblock (in-memory image), but
1868 * if we are allowed to, skip spares which already
1869 * have the right event counter, or have one earlier
1870 * (which would mean they aren't being marked as dirty
1871 * with the rest of the array)
1875 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1876 if (rdev
->sb_events
== mddev
->events
||
1878 rdev
->raid_disk
< 0 &&
1879 (rdev
->sb_events
&1)==0 &&
1880 rdev
->sb_events
+1 == mddev
->events
)) {
1881 /* Don't update this superblock */
1882 rdev
->sb_loaded
= 2;
1884 super_types
[mddev
->major_version
].
1885 sync_super(mddev
, rdev
);
1886 rdev
->sb_loaded
= 1;
1891 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1897 if (mddev
->external
)
1900 spin_lock_irq(&mddev
->write_lock
);
1902 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1903 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1905 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1906 /* just a clean<-> dirty transition, possibly leave spares alone,
1907 * though if events isn't the right even/odd, we will have to do
1913 if (mddev
->degraded
)
1914 /* If the array is degraded, then skipping spares is both
1915 * dangerous and fairly pointless.
1916 * Dangerous because a device that was removed from the array
1917 * might have a event_count that still looks up-to-date,
1918 * so it can be re-added without a resync.
1919 * Pointless because if there are any spares to skip,
1920 * then a recovery will happen and soon that array won't
1921 * be degraded any more and the spare can go back to sleep then.
1925 sync_req
= mddev
->in_sync
;
1926 mddev
->utime
= get_seconds();
1928 /* If this is just a dirty<->clean transition, and the array is clean
1929 * and 'events' is odd, we can roll back to the previous clean state */
1931 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1932 && (mddev
->events
& 1)
1933 && mddev
->events
!= 1)
1936 /* otherwise we have to go forward and ... */
1938 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1939 /* .. if the array isn't clean, insist on an odd 'events' */
1940 if ((mddev
->events
&1)==0) {
1945 /* otherwise insist on an even 'events' (for clean states) */
1946 if ((mddev
->events
&1)) {
1953 if (!mddev
->events
) {
1955 * oops, this 64-bit counter should never wrap.
1956 * Either we are in around ~1 trillion A.C., assuming
1957 * 1 reboot per second, or we have a bug:
1964 * do not write anything to disk if using
1965 * nonpersistent superblocks
1967 if (!mddev
->persistent
) {
1968 if (!mddev
->external
)
1969 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1971 spin_unlock_irq(&mddev
->write_lock
);
1972 wake_up(&mddev
->sb_wait
);
1975 sync_sbs(mddev
, nospares
);
1976 spin_unlock_irq(&mddev
->write_lock
);
1979 "md: updating %s RAID superblock on device (in sync %d)\n",
1980 mdname(mddev
),mddev
->in_sync
);
1982 bitmap_update_sb(mddev
->bitmap
);
1983 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1984 char b
[BDEVNAME_SIZE
];
1985 dprintk(KERN_INFO
"md: ");
1986 if (rdev
->sb_loaded
!= 1)
1987 continue; /* no noise on spare devices */
1988 if (test_bit(Faulty
, &rdev
->flags
))
1989 dprintk("(skipping faulty ");
1991 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1992 if (!test_bit(Faulty
, &rdev
->flags
)) {
1993 md_super_write(mddev
,rdev
,
1994 rdev
->sb_start
, rdev
->sb_size
,
1996 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1997 bdevname(rdev
->bdev
,b
),
1998 (unsigned long long)rdev
->sb_start
);
1999 rdev
->sb_events
= mddev
->events
;
2003 if (mddev
->level
== LEVEL_MULTIPATH
)
2004 /* only need to write one superblock... */
2007 md_super_wait(mddev
);
2008 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2010 spin_lock_irq(&mddev
->write_lock
);
2011 if (mddev
->in_sync
!= sync_req
||
2012 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2013 /* have to write it out again */
2014 spin_unlock_irq(&mddev
->write_lock
);
2017 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2018 spin_unlock_irq(&mddev
->write_lock
);
2019 wake_up(&mddev
->sb_wait
);
2023 /* words written to sysfs files may, or may not, be \n terminated.
2024 * We want to accept with case. For this we use cmd_match.
2026 static int cmd_match(const char *cmd
, const char *str
)
2028 /* See if cmd, written into a sysfs file, matches
2029 * str. They must either be the same, or cmd can
2030 * have a trailing newline
2032 while (*cmd
&& *str
&& *cmd
== *str
) {
2043 struct rdev_sysfs_entry
{
2044 struct attribute attr
;
2045 ssize_t (*show
)(mdk_rdev_t
*, char *);
2046 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2050 state_show(mdk_rdev_t
*rdev
, char *page
)
2055 if (test_bit(Faulty
, &rdev
->flags
)) {
2056 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2059 if (test_bit(In_sync
, &rdev
->flags
)) {
2060 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2063 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2064 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2067 if (test_bit(Blocked
, &rdev
->flags
)) {
2068 len
+= sprintf(page
+len
, "%sblocked", sep
);
2071 if (!test_bit(Faulty
, &rdev
->flags
) &&
2072 !test_bit(In_sync
, &rdev
->flags
)) {
2073 len
+= sprintf(page
+len
, "%sspare", sep
);
2076 return len
+sprintf(page
+len
, "\n");
2080 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2083 * faulty - simulates and error
2084 * remove - disconnects the device
2085 * writemostly - sets write_mostly
2086 * -writemostly - clears write_mostly
2087 * blocked - sets the Blocked flag
2088 * -blocked - clears the Blocked flag
2091 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2092 md_error(rdev
->mddev
, rdev
);
2094 } else if (cmd_match(buf
, "remove")) {
2095 if (rdev
->raid_disk
>= 0)
2098 mddev_t
*mddev
= rdev
->mddev
;
2099 kick_rdev_from_array(rdev
);
2101 md_update_sb(mddev
, 1);
2102 md_new_event(mddev
);
2105 } else if (cmd_match(buf
, "writemostly")) {
2106 set_bit(WriteMostly
, &rdev
->flags
);
2108 } else if (cmd_match(buf
, "-writemostly")) {
2109 clear_bit(WriteMostly
, &rdev
->flags
);
2111 } else if (cmd_match(buf
, "blocked")) {
2112 set_bit(Blocked
, &rdev
->flags
);
2114 } else if (cmd_match(buf
, "-blocked")) {
2115 clear_bit(Blocked
, &rdev
->flags
);
2116 wake_up(&rdev
->blocked_wait
);
2117 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2118 md_wakeup_thread(rdev
->mddev
->thread
);
2122 if (!err
&& rdev
->sysfs_state
)
2123 sysfs_notify_dirent(rdev
->sysfs_state
);
2124 return err
? err
: len
;
2126 static struct rdev_sysfs_entry rdev_state
=
2127 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2130 errors_show(mdk_rdev_t
*rdev
, char *page
)
2132 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2136 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2139 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2140 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2141 atomic_set(&rdev
->corrected_errors
, n
);
2146 static struct rdev_sysfs_entry rdev_errors
=
2147 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2150 slot_show(mdk_rdev_t
*rdev
, char *page
)
2152 if (rdev
->raid_disk
< 0)
2153 return sprintf(page
, "none\n");
2155 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2159 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2164 int slot
= simple_strtoul(buf
, &e
, 10);
2165 if (strncmp(buf
, "none", 4)==0)
2167 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2169 if (rdev
->mddev
->pers
&& slot
== -1) {
2170 /* Setting 'slot' on an active array requires also
2171 * updating the 'rd%d' link, and communicating
2172 * with the personality with ->hot_*_disk.
2173 * For now we only support removing
2174 * failed/spare devices. This normally happens automatically,
2175 * but not when the metadata is externally managed.
2177 if (rdev
->raid_disk
== -1)
2179 /* personality does all needed checks */
2180 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2182 err
= rdev
->mddev
->pers
->
2183 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2186 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2187 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2188 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2189 md_wakeup_thread(rdev
->mddev
->thread
);
2190 } else if (rdev
->mddev
->pers
) {
2192 /* Activating a spare .. or possibly reactivating
2193 * if we every get bitmaps working here.
2196 if (rdev
->raid_disk
!= -1)
2199 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2202 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2203 if (rdev2
->raid_disk
== slot
)
2206 rdev
->raid_disk
= slot
;
2207 if (test_bit(In_sync
, &rdev
->flags
))
2208 rdev
->saved_raid_disk
= slot
;
2210 rdev
->saved_raid_disk
= -1;
2211 err
= rdev
->mddev
->pers
->
2212 hot_add_disk(rdev
->mddev
, rdev
);
2214 rdev
->raid_disk
= -1;
2217 sysfs_notify_dirent(rdev
->sysfs_state
);
2218 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2219 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2221 "md: cannot register "
2223 nm
, mdname(rdev
->mddev
));
2225 /* don't wakeup anyone, leave that to userspace. */
2227 if (slot
>= rdev
->mddev
->raid_disks
)
2229 rdev
->raid_disk
= slot
;
2230 /* assume it is working */
2231 clear_bit(Faulty
, &rdev
->flags
);
2232 clear_bit(WriteMostly
, &rdev
->flags
);
2233 set_bit(In_sync
, &rdev
->flags
);
2234 sysfs_notify_dirent(rdev
->sysfs_state
);
2240 static struct rdev_sysfs_entry rdev_slot
=
2241 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2244 offset_show(mdk_rdev_t
*rdev
, char *page
)
2246 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2250 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2253 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2254 if (e
==buf
|| (*e
&& *e
!= '\n'))
2256 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2258 if (rdev
->sectors
&& rdev
->mddev
->external
)
2259 /* Must set offset before size, so overlap checks
2262 rdev
->data_offset
= offset
;
2266 static struct rdev_sysfs_entry rdev_offset
=
2267 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2270 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2272 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2275 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2277 /* check if two start/length pairs overlap */
2286 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2288 mddev_t
*my_mddev
= rdev
->mddev
;
2289 sector_t oldsectors
= rdev
->sectors
;
2290 unsigned long long sectors
;
2292 if (strict_strtoull(buf
, 10, §ors
) < 0)
2295 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2296 if (my_mddev
->persistent
) {
2297 sectors
= super_types
[my_mddev
->major_version
].
2298 rdev_size_change(rdev
, sectors
);
2301 } else if (!sectors
)
2302 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2305 if (sectors
< my_mddev
->dev_sectors
)
2306 return -EINVAL
; /* component must fit device */
2308 rdev
->sectors
= sectors
;
2309 if (sectors
> oldsectors
&& my_mddev
->external
) {
2310 /* need to check that all other rdevs with the same ->bdev
2311 * do not overlap. We need to unlock the mddev to avoid
2312 * a deadlock. We have already changed rdev->sectors, and if
2313 * we have to change it back, we will have the lock again.
2317 struct list_head
*tmp
;
2319 mddev_unlock(my_mddev
);
2320 for_each_mddev(mddev
, tmp
) {
2324 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2325 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2326 (rdev
->bdev
== rdev2
->bdev
&&
2328 overlaps(rdev
->data_offset
, rdev
->sectors
,
2334 mddev_unlock(mddev
);
2340 mddev_lock(my_mddev
);
2342 /* Someone else could have slipped in a size
2343 * change here, but doing so is just silly.
2344 * We put oldsectors back because we *know* it is
2345 * safe, and trust userspace not to race with
2348 rdev
->sectors
= oldsectors
;
2355 static struct rdev_sysfs_entry rdev_size
=
2356 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2358 static struct attribute
*rdev_default_attrs
[] = {
2367 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2369 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2370 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2371 mddev_t
*mddev
= rdev
->mddev
;
2377 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2379 if (rdev
->mddev
== NULL
)
2382 rv
= entry
->show(rdev
, page
);
2383 mddev_unlock(mddev
);
2389 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2390 const char *page
, size_t length
)
2392 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2393 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2395 mddev_t
*mddev
= rdev
->mddev
;
2399 if (!capable(CAP_SYS_ADMIN
))
2401 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2403 if (rdev
->mddev
== NULL
)
2406 rv
= entry
->store(rdev
, page
, length
);
2407 mddev_unlock(mddev
);
2412 static void rdev_free(struct kobject
*ko
)
2414 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2417 static struct sysfs_ops rdev_sysfs_ops
= {
2418 .show
= rdev_attr_show
,
2419 .store
= rdev_attr_store
,
2421 static struct kobj_type rdev_ktype
= {
2422 .release
= rdev_free
,
2423 .sysfs_ops
= &rdev_sysfs_ops
,
2424 .default_attrs
= rdev_default_attrs
,
2428 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2430 * mark the device faulty if:
2432 * - the device is nonexistent (zero size)
2433 * - the device has no valid superblock
2435 * a faulty rdev _never_ has rdev->sb set.
2437 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2439 char b
[BDEVNAME_SIZE
];
2444 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2446 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2447 return ERR_PTR(-ENOMEM
);
2450 if ((err
= alloc_disk_sb(rdev
)))
2453 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2457 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2460 rdev
->saved_raid_disk
= -1;
2461 rdev
->raid_disk
= -1;
2463 rdev
->data_offset
= 0;
2464 rdev
->sb_events
= 0;
2465 atomic_set(&rdev
->nr_pending
, 0);
2466 atomic_set(&rdev
->read_errors
, 0);
2467 atomic_set(&rdev
->corrected_errors
, 0);
2469 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2472 "md: %s has zero or unknown size, marking faulty!\n",
2473 bdevname(rdev
->bdev
,b
));
2478 if (super_format
>= 0) {
2479 err
= super_types
[super_format
].
2480 load_super(rdev
, NULL
, super_minor
);
2481 if (err
== -EINVAL
) {
2483 "md: %s does not have a valid v%d.%d "
2484 "superblock, not importing!\n",
2485 bdevname(rdev
->bdev
,b
),
2486 super_format
, super_minor
);
2491 "md: could not read %s's sb, not importing!\n",
2492 bdevname(rdev
->bdev
,b
));
2497 INIT_LIST_HEAD(&rdev
->same_set
);
2498 init_waitqueue_head(&rdev
->blocked_wait
);
2503 if (rdev
->sb_page
) {
2509 return ERR_PTR(err
);
2513 * Check a full RAID array for plausibility
2517 static void analyze_sbs(mddev_t
* mddev
)
2520 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2521 char b
[BDEVNAME_SIZE
];
2524 rdev_for_each(rdev
, tmp
, mddev
)
2525 switch (super_types
[mddev
->major_version
].
2526 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2534 "md: fatal superblock inconsistency in %s"
2535 " -- removing from array\n",
2536 bdevname(rdev
->bdev
,b
));
2537 kick_rdev_from_array(rdev
);
2541 super_types
[mddev
->major_version
].
2542 validate_super(mddev
, freshest
);
2545 rdev_for_each(rdev
, tmp
, mddev
) {
2546 if (rdev
->desc_nr
>= mddev
->max_disks
||
2547 i
> mddev
->max_disks
) {
2549 "md: %s: %s: only %d devices permitted\n",
2550 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2552 kick_rdev_from_array(rdev
);
2555 if (rdev
!= freshest
)
2556 if (super_types
[mddev
->major_version
].
2557 validate_super(mddev
, rdev
)) {
2558 printk(KERN_WARNING
"md: kicking non-fresh %s"
2560 bdevname(rdev
->bdev
,b
));
2561 kick_rdev_from_array(rdev
);
2564 if (mddev
->level
== LEVEL_MULTIPATH
) {
2565 rdev
->desc_nr
= i
++;
2566 rdev
->raid_disk
= rdev
->desc_nr
;
2567 set_bit(In_sync
, &rdev
->flags
);
2568 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2569 rdev
->raid_disk
= -1;
2570 clear_bit(In_sync
, &rdev
->flags
);
2576 if (mddev
->recovery_cp
!= MaxSector
&&
2578 printk(KERN_ERR
"md: %s: raid array is not clean"
2579 " -- starting background reconstruction\n",
2584 static void md_safemode_timeout(unsigned long data
);
2587 safe_delay_show(mddev_t
*mddev
, char *page
)
2589 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2590 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2593 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2601 /* remove a period, and count digits after it */
2602 if (len
>= sizeof(buf
))
2604 strlcpy(buf
, cbuf
, sizeof(buf
));
2605 for (i
=0; i
<len
; i
++) {
2607 if (isdigit(buf
[i
])) {
2612 } else if (buf
[i
] == '.') {
2617 if (strict_strtoul(buf
, 10, &msec
) < 0)
2619 msec
= (msec
* 1000) / scale
;
2621 mddev
->safemode_delay
= 0;
2623 unsigned long old_delay
= mddev
->safemode_delay
;
2624 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2625 if (mddev
->safemode_delay
== 0)
2626 mddev
->safemode_delay
= 1;
2627 if (mddev
->safemode_delay
< old_delay
)
2628 md_safemode_timeout((unsigned long)mddev
);
2632 static struct md_sysfs_entry md_safe_delay
=
2633 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2636 level_show(mddev_t
*mddev
, char *page
)
2638 struct mdk_personality
*p
= mddev
->pers
;
2640 return sprintf(page
, "%s\n", p
->name
);
2641 else if (mddev
->clevel
[0])
2642 return sprintf(page
, "%s\n", mddev
->clevel
);
2643 else if (mddev
->level
!= LEVEL_NONE
)
2644 return sprintf(page
, "%d\n", mddev
->level
);
2650 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2654 struct mdk_personality
*pers
;
2657 if (mddev
->pers
== NULL
) {
2660 if (len
>= sizeof(mddev
->clevel
))
2662 strncpy(mddev
->clevel
, buf
, len
);
2663 if (mddev
->clevel
[len
-1] == '\n')
2665 mddev
->clevel
[len
] = 0;
2666 mddev
->level
= LEVEL_NONE
;
2670 /* request to change the personality. Need to ensure:
2671 * - array is not engaged in resync/recovery/reshape
2672 * - old personality can be suspended
2673 * - new personality will access other array.
2676 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
2679 if (!mddev
->pers
->quiesce
) {
2680 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
2681 mdname(mddev
), mddev
->pers
->name
);
2685 /* Now find the new personality */
2686 if (len
== 0 || len
>= sizeof(level
))
2688 strncpy(level
, buf
, len
);
2689 if (level
[len
-1] == '\n')
2693 request_module("md-%s", level
);
2694 spin_lock(&pers_lock
);
2695 pers
= find_pers(LEVEL_NONE
, level
);
2696 if (!pers
|| !try_module_get(pers
->owner
)) {
2697 spin_unlock(&pers_lock
);
2698 printk(KERN_WARNING
"md: personality %s not loaded\n", level
);
2701 spin_unlock(&pers_lock
);
2703 if (pers
== mddev
->pers
) {
2704 /* Nothing to do! */
2705 module_put(pers
->owner
);
2708 if (!pers
->takeover
) {
2709 module_put(pers
->owner
);
2710 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
2711 mdname(mddev
), level
);
2715 /* ->takeover must set new_* and/or delta_disks
2716 * if it succeeds, and may set them when it fails.
2718 priv
= pers
->takeover(mddev
);
2720 mddev
->new_level
= mddev
->level
;
2721 mddev
->new_layout
= mddev
->layout
;
2722 mddev
->new_chunk
= mddev
->chunk_size
;
2723 mddev
->raid_disks
-= mddev
->delta_disks
;
2724 mddev
->delta_disks
= 0;
2725 module_put(pers
->owner
);
2726 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
2727 mdname(mddev
), level
);
2728 return PTR_ERR(priv
);
2731 /* Looks like we have a winner */
2732 mddev_suspend(mddev
);
2733 mddev
->pers
->stop(mddev
);
2734 module_put(mddev
->pers
->owner
);
2736 mddev
->private = priv
;
2737 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2738 mddev
->level
= mddev
->new_level
;
2739 mddev
->layout
= mddev
->new_layout
;
2740 mddev
->chunk_size
= mddev
->new_chunk
;
2741 mddev
->delta_disks
= 0;
2743 mddev_resume(mddev
);
2744 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2745 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2746 md_wakeup_thread(mddev
->thread
);
2750 static struct md_sysfs_entry md_level
=
2751 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2755 layout_show(mddev_t
*mddev
, char *page
)
2757 /* just a number, not meaningful for all levels */
2758 if (mddev
->reshape_position
!= MaxSector
&&
2759 mddev
->layout
!= mddev
->new_layout
)
2760 return sprintf(page
, "%d (%d)\n",
2761 mddev
->new_layout
, mddev
->layout
);
2762 return sprintf(page
, "%d\n", mddev
->layout
);
2766 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2769 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2771 if (!*buf
|| (*e
&& *e
!= '\n'))
2776 if (mddev
->pers
->reconfig
== NULL
)
2778 err
= mddev
->pers
->reconfig(mddev
, n
, -1);
2782 mddev
->new_layout
= n
;
2783 if (mddev
->reshape_position
== MaxSector
)
2788 static struct md_sysfs_entry md_layout
=
2789 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2793 raid_disks_show(mddev_t
*mddev
, char *page
)
2795 if (mddev
->raid_disks
== 0)
2797 if (mddev
->reshape_position
!= MaxSector
&&
2798 mddev
->delta_disks
!= 0)
2799 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2800 mddev
->raid_disks
- mddev
->delta_disks
);
2801 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2804 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2807 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2811 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2813 if (!*buf
|| (*e
&& *e
!= '\n'))
2817 rv
= update_raid_disks(mddev
, n
);
2818 else if (mddev
->reshape_position
!= MaxSector
) {
2819 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2820 mddev
->delta_disks
= n
- olddisks
;
2821 mddev
->raid_disks
= n
;
2823 mddev
->raid_disks
= n
;
2824 return rv
? rv
: len
;
2826 static struct md_sysfs_entry md_raid_disks
=
2827 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2830 chunk_size_show(mddev_t
*mddev
, char *page
)
2832 if (mddev
->reshape_position
!= MaxSector
&&
2833 mddev
->chunk_size
!= mddev
->new_chunk
)
2834 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2836 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2840 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2843 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2845 if (!*buf
|| (*e
&& *e
!= '\n'))
2850 if (mddev
->pers
->reconfig
== NULL
)
2852 err
= mddev
->pers
->reconfig(mddev
, -1, n
);
2856 mddev
->new_chunk
= n
;
2857 if (mddev
->reshape_position
== MaxSector
)
2858 mddev
->chunk_size
= n
;
2862 static struct md_sysfs_entry md_chunk_size
=
2863 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2866 resync_start_show(mddev_t
*mddev
, char *page
)
2868 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2872 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2875 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2879 if (!*buf
|| (*e
&& *e
!= '\n'))
2882 mddev
->recovery_cp
= n
;
2885 static struct md_sysfs_entry md_resync_start
=
2886 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2889 * The array state can be:
2892 * No devices, no size, no level
2893 * Equivalent to STOP_ARRAY ioctl
2895 * May have some settings, but array is not active
2896 * all IO results in error
2897 * When written, doesn't tear down array, but just stops it
2898 * suspended (not supported yet)
2899 * All IO requests will block. The array can be reconfigured.
2900 * Writing this, if accepted, will block until array is quiescent
2902 * no resync can happen. no superblocks get written.
2903 * write requests fail
2905 * like readonly, but behaves like 'clean' on a write request.
2907 * clean - no pending writes, but otherwise active.
2908 * When written to inactive array, starts without resync
2909 * If a write request arrives then
2910 * if metadata is known, mark 'dirty' and switch to 'active'.
2911 * if not known, block and switch to write-pending
2912 * If written to an active array that has pending writes, then fails.
2914 * fully active: IO and resync can be happening.
2915 * When written to inactive array, starts with resync
2918 * clean, but writes are blocked waiting for 'active' to be written.
2921 * like active, but no writes have been seen for a while (100msec).
2924 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2925 write_pending
, active_idle
, bad_word
};
2926 static char *array_states
[] = {
2927 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2928 "write-pending", "active-idle", NULL
};
2930 static int match_word(const char *word
, char **list
)
2933 for (n
=0; list
[n
]; n
++)
2934 if (cmd_match(word
, list
[n
]))
2940 array_state_show(mddev_t
*mddev
, char *page
)
2942 enum array_state st
= inactive
;
2955 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2957 else if (mddev
->safemode
)
2963 if (list_empty(&mddev
->disks
) &&
2964 mddev
->raid_disks
== 0 &&
2965 mddev
->dev_sectors
== 0)
2970 return sprintf(page
, "%s\n", array_states
[st
]);
2973 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
2974 static int do_md_run(mddev_t
* mddev
);
2975 static int restart_array(mddev_t
*mddev
);
2978 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2981 enum array_state st
= match_word(buf
, array_states
);
2986 /* stopping an active array */
2987 if (atomic_read(&mddev
->openers
) > 0)
2989 err
= do_md_stop(mddev
, 0, 0);
2992 /* stopping an active array */
2994 if (atomic_read(&mddev
->openers
) > 0)
2996 err
= do_md_stop(mddev
, 2, 0);
2998 err
= 0; /* already inactive */
3001 break; /* not supported yet */
3004 err
= do_md_stop(mddev
, 1, 0);
3007 set_disk_ro(mddev
->gendisk
, 1);
3008 err
= do_md_run(mddev
);
3014 err
= do_md_stop(mddev
, 1, 0);
3015 else if (mddev
->ro
== 1)
3016 err
= restart_array(mddev
);
3019 set_disk_ro(mddev
->gendisk
, 0);
3023 err
= do_md_run(mddev
);
3028 restart_array(mddev
);
3029 spin_lock_irq(&mddev
->write_lock
);
3030 if (atomic_read(&mddev
->writes_pending
) == 0) {
3031 if (mddev
->in_sync
== 0) {
3033 if (mddev
->safemode
== 1)
3034 mddev
->safemode
= 0;
3035 if (mddev
->persistent
)
3036 set_bit(MD_CHANGE_CLEAN
,
3042 spin_unlock_irq(&mddev
->write_lock
);
3045 mddev
->recovery_cp
= MaxSector
;
3046 err
= do_md_run(mddev
);
3051 restart_array(mddev
);
3052 if (mddev
->external
)
3053 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3054 wake_up(&mddev
->sb_wait
);
3058 set_disk_ro(mddev
->gendisk
, 0);
3059 err
= do_md_run(mddev
);
3064 /* these cannot be set */
3070 sysfs_notify_dirent(mddev
->sysfs_state
);
3074 static struct md_sysfs_entry md_array_state
=
3075 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3078 null_show(mddev_t
*mddev
, char *page
)
3084 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3086 /* buf must be %d:%d\n? giving major and minor numbers */
3087 /* The new device is added to the array.
3088 * If the array has a persistent superblock, we read the
3089 * superblock to initialise info and check validity.
3090 * Otherwise, only checking done is that in bind_rdev_to_array,
3091 * which mainly checks size.
3094 int major
= simple_strtoul(buf
, &e
, 10);
3100 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3102 minor
= simple_strtoul(e
+1, &e
, 10);
3103 if (*e
&& *e
!= '\n')
3105 dev
= MKDEV(major
, minor
);
3106 if (major
!= MAJOR(dev
) ||
3107 minor
!= MINOR(dev
))
3111 if (mddev
->persistent
) {
3112 rdev
= md_import_device(dev
, mddev
->major_version
,
3113 mddev
->minor_version
);
3114 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3115 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3116 mdk_rdev_t
, same_set
);
3117 err
= super_types
[mddev
->major_version
]
3118 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3122 } else if (mddev
->external
)
3123 rdev
= md_import_device(dev
, -2, -1);
3125 rdev
= md_import_device(dev
, -1, -1);
3128 return PTR_ERR(rdev
);
3129 err
= bind_rdev_to_array(rdev
, mddev
);
3133 return err
? err
: len
;
3136 static struct md_sysfs_entry md_new_device
=
3137 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3140 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3143 unsigned long chunk
, end_chunk
;
3147 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3149 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3150 if (buf
== end
) break;
3151 if (*end
== '-') { /* range */
3153 end_chunk
= simple_strtoul(buf
, &end
, 0);
3154 if (buf
== end
) break;
3156 if (*end
&& !isspace(*end
)) break;
3157 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3159 while (isspace(*buf
)) buf
++;
3161 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3166 static struct md_sysfs_entry md_bitmap
=
3167 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3170 size_show(mddev_t
*mddev
, char *page
)
3172 return sprintf(page
, "%llu\n",
3173 (unsigned long long)mddev
->dev_sectors
/ 2);
3176 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3179 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3181 /* If array is inactive, we can reduce the component size, but
3182 * not increase it (except from 0).
3183 * If array is active, we can try an on-line resize
3185 unsigned long long sectors
;
3186 int err
= strict_strtoull(buf
, 10, §ors
);
3192 err
= update_size(mddev
, sectors
);
3193 md_update_sb(mddev
, 1);
3195 if (mddev
->dev_sectors
== 0 ||
3196 mddev
->dev_sectors
> sectors
)
3197 mddev
->dev_sectors
= sectors
;
3201 return err
? err
: len
;
3204 static struct md_sysfs_entry md_size
=
3205 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3210 * 'none' for arrays with no metadata (good luck...)
3211 * 'external' for arrays with externally managed metadata,
3212 * or N.M for internally known formats
3215 metadata_show(mddev_t
*mddev
, char *page
)
3217 if (mddev
->persistent
)
3218 return sprintf(page
, "%d.%d\n",
3219 mddev
->major_version
, mddev
->minor_version
);
3220 else if (mddev
->external
)
3221 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3223 return sprintf(page
, "none\n");
3227 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3231 /* Changing the details of 'external' metadata is
3232 * always permitted. Otherwise there must be
3233 * no devices attached to the array.
3235 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3237 else if (!list_empty(&mddev
->disks
))
3240 if (cmd_match(buf
, "none")) {
3241 mddev
->persistent
= 0;
3242 mddev
->external
= 0;
3243 mddev
->major_version
= 0;
3244 mddev
->minor_version
= 90;
3247 if (strncmp(buf
, "external:", 9) == 0) {
3248 size_t namelen
= len
-9;
3249 if (namelen
>= sizeof(mddev
->metadata_type
))
3250 namelen
= sizeof(mddev
->metadata_type
)-1;
3251 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3252 mddev
->metadata_type
[namelen
] = 0;
3253 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3254 mddev
->metadata_type
[--namelen
] = 0;
3255 mddev
->persistent
= 0;
3256 mddev
->external
= 1;
3257 mddev
->major_version
= 0;
3258 mddev
->minor_version
= 90;
3261 major
= simple_strtoul(buf
, &e
, 10);
3262 if (e
==buf
|| *e
!= '.')
3265 minor
= simple_strtoul(buf
, &e
, 10);
3266 if (e
==buf
|| (*e
&& *e
!= '\n') )
3268 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3270 mddev
->major_version
= major
;
3271 mddev
->minor_version
= minor
;
3272 mddev
->persistent
= 1;
3273 mddev
->external
= 0;
3277 static struct md_sysfs_entry md_metadata
=
3278 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3281 action_show(mddev_t
*mddev
, char *page
)
3283 char *type
= "idle";
3284 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3285 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3286 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3288 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3289 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3291 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3295 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3298 return sprintf(page
, "%s\n", type
);
3302 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3304 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3307 if (cmd_match(page
, "idle")) {
3308 if (mddev
->sync_thread
) {
3309 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3310 md_unregister_thread(mddev
->sync_thread
);
3311 mddev
->sync_thread
= NULL
;
3312 mddev
->recovery
= 0;
3314 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3315 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3317 else if (cmd_match(page
, "resync"))
3318 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3319 else if (cmd_match(page
, "recover")) {
3320 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3321 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3322 } else if (cmd_match(page
, "reshape")) {
3324 if (mddev
->pers
->start_reshape
== NULL
)
3326 err
= mddev
->pers
->start_reshape(mddev
);
3329 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3331 if (cmd_match(page
, "check"))
3332 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3333 else if (!cmd_match(page
, "repair"))
3335 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3336 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3338 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3339 md_wakeup_thread(mddev
->thread
);
3340 sysfs_notify_dirent(mddev
->sysfs_action
);
3345 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3347 return sprintf(page
, "%llu\n",
3348 (unsigned long long) mddev
->resync_mismatches
);
3351 static struct md_sysfs_entry md_scan_mode
=
3352 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3355 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3358 sync_min_show(mddev_t
*mddev
, char *page
)
3360 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3361 mddev
->sync_speed_min
? "local": "system");
3365 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3369 if (strncmp(buf
, "system", 6)==0) {
3370 mddev
->sync_speed_min
= 0;
3373 min
= simple_strtoul(buf
, &e
, 10);
3374 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3376 mddev
->sync_speed_min
= min
;
3380 static struct md_sysfs_entry md_sync_min
=
3381 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3384 sync_max_show(mddev_t
*mddev
, char *page
)
3386 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3387 mddev
->sync_speed_max
? "local": "system");
3391 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3395 if (strncmp(buf
, "system", 6)==0) {
3396 mddev
->sync_speed_max
= 0;
3399 max
= simple_strtoul(buf
, &e
, 10);
3400 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3402 mddev
->sync_speed_max
= max
;
3406 static struct md_sysfs_entry md_sync_max
=
3407 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3410 degraded_show(mddev_t
*mddev
, char *page
)
3412 return sprintf(page
, "%d\n", mddev
->degraded
);
3414 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3417 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3419 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3423 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3427 if (strict_strtol(buf
, 10, &n
))
3430 if (n
!= 0 && n
!= 1)
3433 mddev
->parallel_resync
= n
;
3435 if (mddev
->sync_thread
)
3436 wake_up(&resync_wait
);
3441 /* force parallel resync, even with shared block devices */
3442 static struct md_sysfs_entry md_sync_force_parallel
=
3443 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3444 sync_force_parallel_show
, sync_force_parallel_store
);
3447 sync_speed_show(mddev_t
*mddev
, char *page
)
3449 unsigned long resync
, dt
, db
;
3450 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3451 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3453 db
= resync
- mddev
->resync_mark_cnt
;
3454 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3457 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3460 sync_completed_show(mddev_t
*mddev
, char *page
)
3462 unsigned long max_sectors
, resync
;
3464 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3465 max_sectors
= mddev
->resync_max_sectors
;
3467 max_sectors
= mddev
->dev_sectors
;
3469 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3470 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3473 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3476 min_sync_show(mddev_t
*mddev
, char *page
)
3478 return sprintf(page
, "%llu\n",
3479 (unsigned long long)mddev
->resync_min
);
3482 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3484 unsigned long long min
;
3485 if (strict_strtoull(buf
, 10, &min
))
3487 if (min
> mddev
->resync_max
)
3489 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3492 /* Must be a multiple of chunk_size */
3493 if (mddev
->chunk_size
) {
3494 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3497 mddev
->resync_min
= min
;
3502 static struct md_sysfs_entry md_min_sync
=
3503 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3506 max_sync_show(mddev_t
*mddev
, char *page
)
3508 if (mddev
->resync_max
== MaxSector
)
3509 return sprintf(page
, "max\n");
3511 return sprintf(page
, "%llu\n",
3512 (unsigned long long)mddev
->resync_max
);
3515 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3517 if (strncmp(buf
, "max", 3) == 0)
3518 mddev
->resync_max
= MaxSector
;
3520 unsigned long long max
;
3521 if (strict_strtoull(buf
, 10, &max
))
3523 if (max
< mddev
->resync_min
)
3525 if (max
< mddev
->resync_max
&&
3526 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3529 /* Must be a multiple of chunk_size */
3530 if (mddev
->chunk_size
) {
3531 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3534 mddev
->resync_max
= max
;
3536 wake_up(&mddev
->recovery_wait
);
3540 static struct md_sysfs_entry md_max_sync
=
3541 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3544 suspend_lo_show(mddev_t
*mddev
, char *page
)
3546 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3550 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3553 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3555 if (mddev
->pers
->quiesce
== NULL
)
3557 if (buf
== e
|| (*e
&& *e
!= '\n'))
3559 if (new >= mddev
->suspend_hi
||
3560 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3561 mddev
->suspend_lo
= new;
3562 mddev
->pers
->quiesce(mddev
, 2);
3567 static struct md_sysfs_entry md_suspend_lo
=
3568 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3572 suspend_hi_show(mddev_t
*mddev
, char *page
)
3574 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3578 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3581 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3583 if (mddev
->pers
->quiesce
== NULL
)
3585 if (buf
== e
|| (*e
&& *e
!= '\n'))
3587 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3588 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3589 mddev
->suspend_hi
= new;
3590 mddev
->pers
->quiesce(mddev
, 1);
3591 mddev
->pers
->quiesce(mddev
, 0);
3596 static struct md_sysfs_entry md_suspend_hi
=
3597 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3600 reshape_position_show(mddev_t
*mddev
, char *page
)
3602 if (mddev
->reshape_position
!= MaxSector
)
3603 return sprintf(page
, "%llu\n",
3604 (unsigned long long)mddev
->reshape_position
);
3605 strcpy(page
, "none\n");
3610 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3613 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3616 if (buf
== e
|| (*e
&& *e
!= '\n'))
3618 mddev
->reshape_position
= new;
3619 mddev
->delta_disks
= 0;
3620 mddev
->new_level
= mddev
->level
;
3621 mddev
->new_layout
= mddev
->layout
;
3622 mddev
->new_chunk
= mddev
->chunk_size
;
3626 static struct md_sysfs_entry md_reshape_position
=
3627 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3628 reshape_position_store
);
3631 static struct attribute
*md_default_attrs
[] = {
3634 &md_raid_disks
.attr
,
3635 &md_chunk_size
.attr
,
3637 &md_resync_start
.attr
,
3639 &md_new_device
.attr
,
3640 &md_safe_delay
.attr
,
3641 &md_array_state
.attr
,
3642 &md_reshape_position
.attr
,
3646 static struct attribute
*md_redundancy_attrs
[] = {
3648 &md_mismatches
.attr
,
3651 &md_sync_speed
.attr
,
3652 &md_sync_force_parallel
.attr
,
3653 &md_sync_completed
.attr
,
3656 &md_suspend_lo
.attr
,
3657 &md_suspend_hi
.attr
,
3662 static struct attribute_group md_redundancy_group
= {
3664 .attrs
= md_redundancy_attrs
,
3669 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3671 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3672 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3677 rv
= mddev_lock(mddev
);
3679 rv
= entry
->show(mddev
, page
);
3680 mddev_unlock(mddev
);
3686 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3687 const char *page
, size_t length
)
3689 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3690 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3695 if (!capable(CAP_SYS_ADMIN
))
3697 rv
= mddev_lock(mddev
);
3698 if (mddev
->hold_active
== UNTIL_IOCTL
)
3699 mddev
->hold_active
= 0;
3701 rv
= entry
->store(mddev
, page
, length
);
3702 mddev_unlock(mddev
);
3707 static void md_free(struct kobject
*ko
)
3709 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3711 if (mddev
->sysfs_state
)
3712 sysfs_put(mddev
->sysfs_state
);
3714 if (mddev
->gendisk
) {
3715 del_gendisk(mddev
->gendisk
);
3716 put_disk(mddev
->gendisk
);
3719 blk_cleanup_queue(mddev
->queue
);
3724 static struct sysfs_ops md_sysfs_ops
= {
3725 .show
= md_attr_show
,
3726 .store
= md_attr_store
,
3728 static struct kobj_type md_ktype
= {
3730 .sysfs_ops
= &md_sysfs_ops
,
3731 .default_attrs
= md_default_attrs
,
3736 static int md_alloc(dev_t dev
, char *name
)
3738 static DEFINE_MUTEX(disks_mutex
);
3739 mddev_t
*mddev
= mddev_find(dev
);
3740 struct gendisk
*disk
;
3749 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
3750 shift
= partitioned
? MdpMinorShift
: 0;
3751 unit
= MINOR(mddev
->unit
) >> shift
;
3753 /* wait for any previous instance if this device
3754 * to be completed removed (mddev_delayed_delete).
3756 flush_scheduled_work();
3758 mutex_lock(&disks_mutex
);
3759 if (mddev
->gendisk
) {
3760 mutex_unlock(&disks_mutex
);
3766 /* Need to ensure that 'name' is not a duplicate.
3769 spin_lock(&all_mddevs_lock
);
3771 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
3772 if (mddev2
->gendisk
&&
3773 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
3774 spin_unlock(&all_mddevs_lock
);
3777 spin_unlock(&all_mddevs_lock
);
3780 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
3781 if (!mddev
->queue
) {
3782 mutex_unlock(&disks_mutex
);
3786 mddev
->queue
->queuedata
= mddev
;
3788 /* Can be unlocked because the queue is new: no concurrency */
3789 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
3791 blk_queue_make_request(mddev
->queue
, md_make_request
);
3793 disk
= alloc_disk(1 << shift
);
3795 mutex_unlock(&disks_mutex
);
3796 blk_cleanup_queue(mddev
->queue
);
3797 mddev
->queue
= NULL
;
3801 disk
->major
= MAJOR(mddev
->unit
);
3802 disk
->first_minor
= unit
<< shift
;
3804 strcpy(disk
->disk_name
, name
);
3805 else if (partitioned
)
3806 sprintf(disk
->disk_name
, "md_d%d", unit
);
3808 sprintf(disk
->disk_name
, "md%d", unit
);
3809 disk
->fops
= &md_fops
;
3810 disk
->private_data
= mddev
;
3811 disk
->queue
= mddev
->queue
;
3812 /* Allow extended partitions. This makes the
3813 * 'mdp' device redundant, but we can't really
3816 disk
->flags
|= GENHD_FL_EXT_DEVT
;
3818 mddev
->gendisk
= disk
;
3819 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
3820 &disk_to_dev(disk
)->kobj
, "%s", "md");
3821 mutex_unlock(&disks_mutex
);
3823 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3826 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3827 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, "array_state");
3833 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3835 md_alloc(dev
, NULL
);
3839 static int add_named_array(const char *val
, struct kernel_param
*kp
)
3841 /* val must be "md_*" where * is not all digits.
3842 * We allocate an array with a large free minor number, and
3843 * set the name to val. val must not already be an active name.
3845 int len
= strlen(val
);
3846 char buf
[DISK_NAME_LEN
];
3848 while (len
&& val
[len
-1] == '\n')
3850 if (len
>= DISK_NAME_LEN
)
3852 strlcpy(buf
, val
, len
+1);
3853 if (strncmp(buf
, "md_", 3) != 0)
3855 return md_alloc(0, buf
);
3858 static void md_safemode_timeout(unsigned long data
)
3860 mddev_t
*mddev
= (mddev_t
*) data
;
3862 if (!atomic_read(&mddev
->writes_pending
)) {
3863 mddev
->safemode
= 1;
3864 if (mddev
->external
)
3865 sysfs_notify_dirent(mddev
->sysfs_state
);
3867 md_wakeup_thread(mddev
->thread
);
3870 static int start_dirty_degraded
;
3872 static int do_md_run(mddev_t
* mddev
)
3877 struct gendisk
*disk
;
3878 struct mdk_personality
*pers
;
3879 char b
[BDEVNAME_SIZE
];
3881 if (list_empty(&mddev
->disks
))
3882 /* cannot run an array with no devices.. */
3889 * Analyze all RAID superblock(s)
3891 if (!mddev
->raid_disks
) {
3892 if (!mddev
->persistent
)
3897 chunk_size
= mddev
->chunk_size
;
3900 if (chunk_size
> MAX_CHUNK_SIZE
) {
3901 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3902 chunk_size
, MAX_CHUNK_SIZE
);
3906 * chunk-size has to be a power of 2
3908 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3909 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3913 /* devices must have minimum size of one chunk */
3914 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3915 if (test_bit(Faulty
, &rdev
->flags
))
3917 if (rdev
->sectors
< chunk_size
/ 512) {
3919 "md: Dev %s smaller than chunk_size:"
3921 bdevname(rdev
->bdev
,b
),
3922 (unsigned long long)rdev
->sectors
,
3929 if (mddev
->level
!= LEVEL_NONE
)
3930 request_module("md-level-%d", mddev
->level
);
3931 else if (mddev
->clevel
[0])
3932 request_module("md-%s", mddev
->clevel
);
3935 * Drop all container device buffers, from now on
3936 * the only valid external interface is through the md
3939 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3940 if (test_bit(Faulty
, &rdev
->flags
))
3942 sync_blockdev(rdev
->bdev
);
3943 invalidate_bdev(rdev
->bdev
);
3945 /* perform some consistency tests on the device.
3946 * We don't want the data to overlap the metadata,
3947 * Internal Bitmap issues have been handled elsewhere.
3949 if (rdev
->data_offset
< rdev
->sb_start
) {
3950 if (mddev
->dev_sectors
&&
3951 rdev
->data_offset
+ mddev
->dev_sectors
3953 printk("md: %s: data overlaps metadata\n",
3958 if (rdev
->sb_start
+ rdev
->sb_size
/512
3959 > rdev
->data_offset
) {
3960 printk("md: %s: metadata overlaps data\n",
3965 sysfs_notify_dirent(rdev
->sysfs_state
);
3968 md_probe(mddev
->unit
, NULL
, NULL
);
3969 disk
= mddev
->gendisk
;
3973 spin_lock(&pers_lock
);
3974 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3975 if (!pers
|| !try_module_get(pers
->owner
)) {
3976 spin_unlock(&pers_lock
);
3977 if (mddev
->level
!= LEVEL_NONE
)
3978 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3981 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3986 spin_unlock(&pers_lock
);
3987 if (mddev
->level
!= pers
->level
) {
3988 mddev
->level
= pers
->level
;
3989 mddev
->new_level
= pers
->level
;
3991 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3993 if (pers
->level
>= 4 && pers
->level
<= 6)
3994 /* Cannot support integrity (yet) */
3995 blk_integrity_unregister(mddev
->gendisk
);
3997 if (mddev
->reshape_position
!= MaxSector
&&
3998 pers
->start_reshape
== NULL
) {
3999 /* This personality cannot handle reshaping... */
4001 module_put(pers
->owner
);
4005 if (pers
->sync_request
) {
4006 /* Warn if this is a potentially silly
4009 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4013 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4014 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4016 rdev
->bdev
->bd_contains
==
4017 rdev2
->bdev
->bd_contains
) {
4019 "%s: WARNING: %s appears to be"
4020 " on the same physical disk as"
4023 bdevname(rdev
->bdev
,b
),
4024 bdevname(rdev2
->bdev
,b2
));
4031 "True protection against single-disk"
4032 " failure might be compromised.\n");
4035 mddev
->recovery
= 0;
4036 /* may be over-ridden by personality */
4037 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4039 mddev
->barriers_work
= 1;
4040 mddev
->ok_start_degraded
= start_dirty_degraded
;
4043 mddev
->ro
= 2; /* read-only, but switch on first write */
4045 err
= mddev
->pers
->run(mddev
);
4047 printk(KERN_ERR
"md: pers->run() failed ...\n");
4048 else if (mddev
->pers
->sync_request
) {
4049 err
= bitmap_create(mddev
);
4051 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4052 mdname(mddev
), err
);
4053 mddev
->pers
->stop(mddev
);
4057 module_put(mddev
->pers
->owner
);
4059 bitmap_destroy(mddev
);
4062 if (mddev
->pers
->sync_request
) {
4063 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4065 "md: cannot register extra attributes for %s\n",
4067 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4068 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4071 atomic_set(&mddev
->writes_pending
,0);
4072 mddev
->safemode
= 0;
4073 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4074 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4075 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4078 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4079 if (rdev
->raid_disk
>= 0) {
4081 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4082 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4083 printk("md: cannot register %s for %s\n",
4087 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4090 md_update_sb(mddev
, 0);
4092 set_capacity(disk
, mddev
->array_sectors
);
4094 /* If there is a partially-recovered drive we need to
4095 * start recovery here. If we leave it to md_check_recovery,
4096 * it will remove the drives and not do the right thing
4098 if (mddev
->degraded
&& !mddev
->sync_thread
) {
4100 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4101 if (rdev
->raid_disk
>= 0 &&
4102 !test_bit(In_sync
, &rdev
->flags
) &&
4103 !test_bit(Faulty
, &rdev
->flags
))
4104 /* complete an interrupted recovery */
4106 if (spares
&& mddev
->pers
->sync_request
) {
4107 mddev
->recovery
= 0;
4108 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4109 mddev
->sync_thread
= md_register_thread(md_do_sync
,
4112 if (!mddev
->sync_thread
) {
4113 printk(KERN_ERR
"%s: could not start resync"
4116 /* leave the spares where they are, it shouldn't hurt */
4117 mddev
->recovery
= 0;
4121 md_wakeup_thread(mddev
->thread
);
4122 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4125 md_new_event(mddev
);
4126 sysfs_notify_dirent(mddev
->sysfs_state
);
4127 if (mddev
->sysfs_action
)
4128 sysfs_notify_dirent(mddev
->sysfs_action
);
4129 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4130 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4134 static int restart_array(mddev_t
*mddev
)
4136 struct gendisk
*disk
= mddev
->gendisk
;
4138 /* Complain if it has no devices */
4139 if (list_empty(&mddev
->disks
))
4145 mddev
->safemode
= 0;
4147 set_disk_ro(disk
, 0);
4148 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4150 /* Kick recovery or resync if necessary */
4151 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4152 md_wakeup_thread(mddev
->thread
);
4153 md_wakeup_thread(mddev
->sync_thread
);
4154 sysfs_notify_dirent(mddev
->sysfs_state
);
4158 /* similar to deny_write_access, but accounts for our holding a reference
4159 * to the file ourselves */
4160 static int deny_bitmap_write_access(struct file
* file
)
4162 struct inode
*inode
= file
->f_mapping
->host
;
4164 spin_lock(&inode
->i_lock
);
4165 if (atomic_read(&inode
->i_writecount
) > 1) {
4166 spin_unlock(&inode
->i_lock
);
4169 atomic_set(&inode
->i_writecount
, -1);
4170 spin_unlock(&inode
->i_lock
);
4175 static void restore_bitmap_write_access(struct file
*file
)
4177 struct inode
*inode
= file
->f_mapping
->host
;
4179 spin_lock(&inode
->i_lock
);
4180 atomic_set(&inode
->i_writecount
, 1);
4181 spin_unlock(&inode
->i_lock
);
4185 * 0 - completely stop and dis-assemble array
4186 * 1 - switch to readonly
4187 * 2 - stop but do not disassemble array
4189 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4192 struct gendisk
*disk
= mddev
->gendisk
;
4194 if (atomic_read(&mddev
->openers
) > is_open
) {
4195 printk("md: %s still in use.\n",mdname(mddev
));
4201 if (mddev
->sync_thread
) {
4202 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4203 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4204 md_unregister_thread(mddev
->sync_thread
);
4205 mddev
->sync_thread
= NULL
;
4208 del_timer_sync(&mddev
->safemode_timer
);
4211 case 1: /* readonly */
4217 case 0: /* disassemble */
4219 bitmap_flush(mddev
);
4220 md_super_wait(mddev
);
4222 set_disk_ro(disk
, 0);
4224 mddev
->pers
->stop(mddev
);
4225 mddev
->queue
->merge_bvec_fn
= NULL
;
4226 mddev
->queue
->unplug_fn
= NULL
;
4227 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4228 if (mddev
->pers
->sync_request
) {
4229 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
4230 if (mddev
->sysfs_action
)
4231 sysfs_put(mddev
->sysfs_action
);
4232 mddev
->sysfs_action
= NULL
;
4234 module_put(mddev
->pers
->owner
);
4236 /* tell userspace to handle 'inactive' */
4237 sysfs_notify_dirent(mddev
->sysfs_state
);
4239 set_capacity(disk
, 0);
4245 if (!mddev
->in_sync
|| mddev
->flags
) {
4246 /* mark array as shutdown cleanly */
4248 md_update_sb(mddev
, 1);
4251 set_disk_ro(disk
, 1);
4252 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4256 * Free resources if final stop
4261 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4263 bitmap_destroy(mddev
);
4264 if (mddev
->bitmap_file
) {
4265 restore_bitmap_write_access(mddev
->bitmap_file
);
4266 fput(mddev
->bitmap_file
);
4267 mddev
->bitmap_file
= NULL
;
4269 mddev
->bitmap_offset
= 0;
4271 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4272 if (rdev
->raid_disk
>= 0) {
4274 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4275 sysfs_remove_link(&mddev
->kobj
, nm
);
4278 /* make sure all md_delayed_delete calls have finished */
4279 flush_scheduled_work();
4281 export_array(mddev
);
4283 mddev
->array_sectors
= 0;
4284 mddev
->dev_sectors
= 0;
4285 mddev
->raid_disks
= 0;
4286 mddev
->recovery_cp
= 0;
4287 mddev
->resync_min
= 0;
4288 mddev
->resync_max
= MaxSector
;
4289 mddev
->reshape_position
= MaxSector
;
4290 mddev
->external
= 0;
4291 mddev
->persistent
= 0;
4292 mddev
->level
= LEVEL_NONE
;
4293 mddev
->clevel
[0] = 0;
4296 mddev
->metadata_type
[0] = 0;
4297 mddev
->chunk_size
= 0;
4298 mddev
->ctime
= mddev
->utime
= 0;
4300 mddev
->max_disks
= 0;
4302 mddev
->delta_disks
= 0;
4303 mddev
->new_level
= LEVEL_NONE
;
4304 mddev
->new_layout
= 0;
4305 mddev
->new_chunk
= 0;
4306 mddev
->curr_resync
= 0;
4307 mddev
->resync_mismatches
= 0;
4308 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4309 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4310 mddev
->recovery
= 0;
4313 mddev
->degraded
= 0;
4314 mddev
->barriers_work
= 0;
4315 mddev
->safemode
= 0;
4316 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4317 if (mddev
->hold_active
== UNTIL_STOP
)
4318 mddev
->hold_active
= 0;
4320 } else if (mddev
->pers
)
4321 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
4324 blk_integrity_unregister(disk
);
4325 md_new_event(mddev
);
4326 sysfs_notify_dirent(mddev
->sysfs_state
);
4332 static void autorun_array(mddev_t
*mddev
)
4337 if (list_empty(&mddev
->disks
))
4340 printk(KERN_INFO
"md: running: ");
4342 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4343 char b
[BDEVNAME_SIZE
];
4344 printk("<%s>", bdevname(rdev
->bdev
,b
));
4348 err
= do_md_run(mddev
);
4350 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4351 do_md_stop(mddev
, 0, 0);
4356 * lets try to run arrays based on all disks that have arrived
4357 * until now. (those are in pending_raid_disks)
4359 * the method: pick the first pending disk, collect all disks with
4360 * the same UUID, remove all from the pending list and put them into
4361 * the 'same_array' list. Then order this list based on superblock
4362 * update time (freshest comes first), kick out 'old' disks and
4363 * compare superblocks. If everything's fine then run it.
4365 * If "unit" is allocated, then bump its reference count
4367 static void autorun_devices(int part
)
4369 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4371 char b
[BDEVNAME_SIZE
];
4373 printk(KERN_INFO
"md: autorun ...\n");
4374 while (!list_empty(&pending_raid_disks
)) {
4377 LIST_HEAD(candidates
);
4378 rdev0
= list_entry(pending_raid_disks
.next
,
4379 mdk_rdev_t
, same_set
);
4381 printk(KERN_INFO
"md: considering %s ...\n",
4382 bdevname(rdev0
->bdev
,b
));
4383 INIT_LIST_HEAD(&candidates
);
4384 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4385 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4386 printk(KERN_INFO
"md: adding %s ...\n",
4387 bdevname(rdev
->bdev
,b
));
4388 list_move(&rdev
->same_set
, &candidates
);
4391 * now we have a set of devices, with all of them having
4392 * mostly sane superblocks. It's time to allocate the
4396 dev
= MKDEV(mdp_major
,
4397 rdev0
->preferred_minor
<< MdpMinorShift
);
4398 unit
= MINOR(dev
) >> MdpMinorShift
;
4400 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4403 if (rdev0
->preferred_minor
!= unit
) {
4404 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4405 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4409 md_probe(dev
, NULL
, NULL
);
4410 mddev
= mddev_find(dev
);
4411 if (!mddev
|| !mddev
->gendisk
) {
4415 "md: cannot allocate memory for md drive.\n");
4418 if (mddev_lock(mddev
))
4419 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4421 else if (mddev
->raid_disks
|| mddev
->major_version
4422 || !list_empty(&mddev
->disks
)) {
4424 "md: %s already running, cannot run %s\n",
4425 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4426 mddev_unlock(mddev
);
4428 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4429 mddev
->persistent
= 1;
4430 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4431 list_del_init(&rdev
->same_set
);
4432 if (bind_rdev_to_array(rdev
, mddev
))
4435 autorun_array(mddev
);
4436 mddev_unlock(mddev
);
4438 /* on success, candidates will be empty, on error
4441 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4442 list_del_init(&rdev
->same_set
);
4447 printk(KERN_INFO
"md: ... autorun DONE.\n");
4449 #endif /* !MODULE */
4451 static int get_version(void __user
* arg
)
4455 ver
.major
= MD_MAJOR_VERSION
;
4456 ver
.minor
= MD_MINOR_VERSION
;
4457 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4459 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4465 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4467 mdu_array_info_t info
;
4468 int nr
,working
,active
,failed
,spare
;
4471 nr
=working
=active
=failed
=spare
=0;
4472 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4474 if (test_bit(Faulty
, &rdev
->flags
))
4478 if (test_bit(In_sync
, &rdev
->flags
))
4485 info
.major_version
= mddev
->major_version
;
4486 info
.minor_version
= mddev
->minor_version
;
4487 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4488 info
.ctime
= mddev
->ctime
;
4489 info
.level
= mddev
->level
;
4490 info
.size
= mddev
->dev_sectors
/ 2;
4491 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4494 info
.raid_disks
= mddev
->raid_disks
;
4495 info
.md_minor
= mddev
->md_minor
;
4496 info
.not_persistent
= !mddev
->persistent
;
4498 info
.utime
= mddev
->utime
;
4501 info
.state
= (1<<MD_SB_CLEAN
);
4502 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4503 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4504 info
.active_disks
= active
;
4505 info
.working_disks
= working
;
4506 info
.failed_disks
= failed
;
4507 info
.spare_disks
= spare
;
4509 info
.layout
= mddev
->layout
;
4510 info
.chunk_size
= mddev
->chunk_size
;
4512 if (copy_to_user(arg
, &info
, sizeof(info
)))
4518 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4520 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4521 char *ptr
, *buf
= NULL
;
4524 if (md_allow_write(mddev
))
4525 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4527 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4532 /* bitmap disabled, zero the first byte and copy out */
4533 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4534 file
->pathname
[0] = '\0';
4538 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4542 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4546 strcpy(file
->pathname
, ptr
);
4550 if (copy_to_user(arg
, file
, sizeof(*file
)))
4558 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4560 mdu_disk_info_t info
;
4563 if (copy_from_user(&info
, arg
, sizeof(info
)))
4566 rdev
= find_rdev_nr(mddev
, info
.number
);
4568 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4569 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4570 info
.raid_disk
= rdev
->raid_disk
;
4572 if (test_bit(Faulty
, &rdev
->flags
))
4573 info
.state
|= (1<<MD_DISK_FAULTY
);
4574 else if (test_bit(In_sync
, &rdev
->flags
)) {
4575 info
.state
|= (1<<MD_DISK_ACTIVE
);
4576 info
.state
|= (1<<MD_DISK_SYNC
);
4578 if (test_bit(WriteMostly
, &rdev
->flags
))
4579 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4581 info
.major
= info
.minor
= 0;
4582 info
.raid_disk
= -1;
4583 info
.state
= (1<<MD_DISK_REMOVED
);
4586 if (copy_to_user(arg
, &info
, sizeof(info
)))
4592 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4594 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4596 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4598 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4601 if (!mddev
->raid_disks
) {
4603 /* expecting a device which has a superblock */
4604 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4607 "md: md_import_device returned %ld\n",
4609 return PTR_ERR(rdev
);
4611 if (!list_empty(&mddev
->disks
)) {
4612 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4613 mdk_rdev_t
, same_set
);
4614 int err
= super_types
[mddev
->major_version
]
4615 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4618 "md: %s has different UUID to %s\n",
4619 bdevname(rdev
->bdev
,b
),
4620 bdevname(rdev0
->bdev
,b2
));
4625 err
= bind_rdev_to_array(rdev
, mddev
);
4632 * add_new_disk can be used once the array is assembled
4633 * to add "hot spares". They must already have a superblock
4638 if (!mddev
->pers
->hot_add_disk
) {
4640 "%s: personality does not support diskops!\n",
4644 if (mddev
->persistent
)
4645 rdev
= md_import_device(dev
, mddev
->major_version
,
4646 mddev
->minor_version
);
4648 rdev
= md_import_device(dev
, -1, -1);
4651 "md: md_import_device returned %ld\n",
4653 return PTR_ERR(rdev
);
4655 /* set save_raid_disk if appropriate */
4656 if (!mddev
->persistent
) {
4657 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4658 info
->raid_disk
< mddev
->raid_disks
)
4659 rdev
->raid_disk
= info
->raid_disk
;
4661 rdev
->raid_disk
= -1;
4663 super_types
[mddev
->major_version
].
4664 validate_super(mddev
, rdev
);
4665 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4667 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4668 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4669 set_bit(WriteMostly
, &rdev
->flags
);
4671 clear_bit(WriteMostly
, &rdev
->flags
);
4673 rdev
->raid_disk
= -1;
4674 err
= bind_rdev_to_array(rdev
, mddev
);
4675 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4676 /* If there is hot_add_disk but no hot_remove_disk
4677 * then added disks for geometry changes,
4678 * and should be added immediately.
4680 super_types
[mddev
->major_version
].
4681 validate_super(mddev
, rdev
);
4682 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4684 unbind_rdev_from_array(rdev
);
4689 sysfs_notify_dirent(rdev
->sysfs_state
);
4691 md_update_sb(mddev
, 1);
4692 if (mddev
->degraded
)
4693 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4694 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4695 md_wakeup_thread(mddev
->thread
);
4699 /* otherwise, add_new_disk is only allowed
4700 * for major_version==0 superblocks
4702 if (mddev
->major_version
!= 0) {
4703 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4708 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4710 rdev
= md_import_device(dev
, -1, 0);
4713 "md: error, md_import_device() returned %ld\n",
4715 return PTR_ERR(rdev
);
4717 rdev
->desc_nr
= info
->number
;
4718 if (info
->raid_disk
< mddev
->raid_disks
)
4719 rdev
->raid_disk
= info
->raid_disk
;
4721 rdev
->raid_disk
= -1;
4723 if (rdev
->raid_disk
< mddev
->raid_disks
)
4724 if (info
->state
& (1<<MD_DISK_SYNC
))
4725 set_bit(In_sync
, &rdev
->flags
);
4727 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4728 set_bit(WriteMostly
, &rdev
->flags
);
4730 if (!mddev
->persistent
) {
4731 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4732 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4734 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4735 rdev
->sectors
= calc_num_sectors(rdev
, mddev
->chunk_size
);
4737 err
= bind_rdev_to_array(rdev
, mddev
);
4747 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4749 char b
[BDEVNAME_SIZE
];
4752 rdev
= find_rdev(mddev
, dev
);
4756 if (rdev
->raid_disk
>= 0)
4759 kick_rdev_from_array(rdev
);
4760 md_update_sb(mddev
, 1);
4761 md_new_event(mddev
);
4765 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4766 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4770 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4772 char b
[BDEVNAME_SIZE
];
4779 if (mddev
->major_version
!= 0) {
4780 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4781 " version-0 superblocks.\n",
4785 if (!mddev
->pers
->hot_add_disk
) {
4787 "%s: personality does not support diskops!\n",
4792 rdev
= md_import_device(dev
, -1, 0);
4795 "md: error, md_import_device() returned %ld\n",
4800 if (mddev
->persistent
)
4801 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4803 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4805 rdev
->sectors
= calc_num_sectors(rdev
, mddev
->chunk_size
);
4807 if (test_bit(Faulty
, &rdev
->flags
)) {
4809 "md: can not hot-add faulty %s disk to %s!\n",
4810 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4814 clear_bit(In_sync
, &rdev
->flags
);
4816 rdev
->saved_raid_disk
= -1;
4817 err
= bind_rdev_to_array(rdev
, mddev
);
4822 * The rest should better be atomic, we can have disk failures
4823 * noticed in interrupt contexts ...
4826 rdev
->raid_disk
= -1;
4828 md_update_sb(mddev
, 1);
4831 * Kick recovery, maybe this spare has to be added to the
4832 * array immediately.
4834 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4835 md_wakeup_thread(mddev
->thread
);
4836 md_new_event(mddev
);
4844 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4849 if (!mddev
->pers
->quiesce
)
4851 if (mddev
->recovery
|| mddev
->sync_thread
)
4853 /* we should be able to change the bitmap.. */
4859 return -EEXIST
; /* cannot add when bitmap is present */
4860 mddev
->bitmap_file
= fget(fd
);
4862 if (mddev
->bitmap_file
== NULL
) {
4863 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4868 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4870 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4872 fput(mddev
->bitmap_file
);
4873 mddev
->bitmap_file
= NULL
;
4876 mddev
->bitmap_offset
= 0; /* file overrides offset */
4877 } else if (mddev
->bitmap
== NULL
)
4878 return -ENOENT
; /* cannot remove what isn't there */
4881 mddev
->pers
->quiesce(mddev
, 1);
4883 err
= bitmap_create(mddev
);
4884 if (fd
< 0 || err
) {
4885 bitmap_destroy(mddev
);
4886 fd
= -1; /* make sure to put the file */
4888 mddev
->pers
->quiesce(mddev
, 0);
4891 if (mddev
->bitmap_file
) {
4892 restore_bitmap_write_access(mddev
->bitmap_file
);
4893 fput(mddev
->bitmap_file
);
4895 mddev
->bitmap_file
= NULL
;
4902 * set_array_info is used two different ways
4903 * The original usage is when creating a new array.
4904 * In this usage, raid_disks is > 0 and it together with
4905 * level, size, not_persistent,layout,chunksize determine the
4906 * shape of the array.
4907 * This will always create an array with a type-0.90.0 superblock.
4908 * The newer usage is when assembling an array.
4909 * In this case raid_disks will be 0, and the major_version field is
4910 * use to determine which style super-blocks are to be found on the devices.
4911 * The minor and patch _version numbers are also kept incase the
4912 * super_block handler wishes to interpret them.
4914 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4917 if (info
->raid_disks
== 0) {
4918 /* just setting version number for superblock loading */
4919 if (info
->major_version
< 0 ||
4920 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4921 super_types
[info
->major_version
].name
== NULL
) {
4922 /* maybe try to auto-load a module? */
4924 "md: superblock version %d not known\n",
4925 info
->major_version
);
4928 mddev
->major_version
= info
->major_version
;
4929 mddev
->minor_version
= info
->minor_version
;
4930 mddev
->patch_version
= info
->patch_version
;
4931 mddev
->persistent
= !info
->not_persistent
;
4934 mddev
->major_version
= MD_MAJOR_VERSION
;
4935 mddev
->minor_version
= MD_MINOR_VERSION
;
4936 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4937 mddev
->ctime
= get_seconds();
4939 mddev
->level
= info
->level
;
4940 mddev
->clevel
[0] = 0;
4941 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
4942 mddev
->raid_disks
= info
->raid_disks
;
4943 /* don't set md_minor, it is determined by which /dev/md* was
4946 if (info
->state
& (1<<MD_SB_CLEAN
))
4947 mddev
->recovery_cp
= MaxSector
;
4949 mddev
->recovery_cp
= 0;
4950 mddev
->persistent
= ! info
->not_persistent
;
4951 mddev
->external
= 0;
4953 mddev
->layout
= info
->layout
;
4954 mddev
->chunk_size
= info
->chunk_size
;
4956 mddev
->max_disks
= MD_SB_DISKS
;
4958 if (mddev
->persistent
)
4960 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4962 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4963 mddev
->bitmap_offset
= 0;
4965 mddev
->reshape_position
= MaxSector
;
4968 * Generate a 128 bit UUID
4970 get_random_bytes(mddev
->uuid
, 16);
4972 mddev
->new_level
= mddev
->level
;
4973 mddev
->new_chunk
= mddev
->chunk_size
;
4974 mddev
->new_layout
= mddev
->layout
;
4975 mddev
->delta_disks
= 0;
4980 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
4984 int fit
= (num_sectors
== 0);
4986 if (mddev
->pers
->resize
== NULL
)
4988 /* The "num_sectors" is the number of sectors of each device that
4989 * is used. This can only make sense for arrays with redundancy.
4990 * linear and raid0 always use whatever space is available. We can only
4991 * consider changing this number if no resync or reconstruction is
4992 * happening, and if the new size is acceptable. It must fit before the
4993 * sb_start or, if that is <data_offset, it must fit before the size
4994 * of each device. If num_sectors is zero, we find the largest size
4998 if (mddev
->sync_thread
)
5001 /* Sorry, cannot grow a bitmap yet, just remove it,
5005 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5006 sector_t avail
= rdev
->sectors
;
5008 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5009 num_sectors
= avail
;
5010 if (avail
< num_sectors
)
5013 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5015 struct block_device
*bdev
;
5017 bdev
= bdget_disk(mddev
->gendisk
, 0);
5019 mutex_lock(&bdev
->bd_inode
->i_mutex
);
5020 i_size_write(bdev
->bd_inode
,
5021 (loff_t
)mddev
->array_sectors
<< 9);
5022 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
5029 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5032 /* change the number of raid disks */
5033 if (mddev
->pers
->check_reshape
== NULL
)
5035 if (raid_disks
<= 0 ||
5036 raid_disks
>= mddev
->max_disks
)
5038 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5040 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5042 rv
= mddev
->pers
->check_reshape(mddev
);
5048 * update_array_info is used to change the configuration of an
5050 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5051 * fields in the info are checked against the array.
5052 * Any differences that cannot be handled will cause an error.
5053 * Normally, only one change can be managed at a time.
5055 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5061 /* calculate expected state,ignoring low bits */
5062 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
5063 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5065 if (mddev
->major_version
!= info
->major_version
||
5066 mddev
->minor_version
!= info
->minor_version
||
5067 /* mddev->patch_version != info->patch_version || */
5068 mddev
->ctime
!= info
->ctime
||
5069 mddev
->level
!= info
->level
||
5070 /* mddev->layout != info->layout || */
5071 !mddev
->persistent
!= info
->not_persistent
||
5072 mddev
->chunk_size
!= info
->chunk_size
||
5073 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5074 ((state
^info
->state
) & 0xfffffe00)
5077 /* Check there is only one change */
5078 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5080 if (mddev
->raid_disks
!= info
->raid_disks
)
5082 if (mddev
->layout
!= info
->layout
)
5084 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5091 if (mddev
->layout
!= info
->layout
) {
5093 * we don't need to do anything at the md level, the
5094 * personality will take care of it all.
5096 if (mddev
->pers
->reconfig
== NULL
)
5099 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
5101 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5102 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5104 if (mddev
->raid_disks
!= info
->raid_disks
)
5105 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5107 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5108 if (mddev
->pers
->quiesce
== NULL
)
5110 if (mddev
->recovery
|| mddev
->sync_thread
)
5112 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5113 /* add the bitmap */
5116 if (mddev
->default_bitmap_offset
== 0)
5118 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
5119 mddev
->pers
->quiesce(mddev
, 1);
5120 rv
= bitmap_create(mddev
);
5122 bitmap_destroy(mddev
);
5123 mddev
->pers
->quiesce(mddev
, 0);
5125 /* remove the bitmap */
5128 if (mddev
->bitmap
->file
)
5130 mddev
->pers
->quiesce(mddev
, 1);
5131 bitmap_destroy(mddev
);
5132 mddev
->pers
->quiesce(mddev
, 0);
5133 mddev
->bitmap_offset
= 0;
5136 md_update_sb(mddev
, 1);
5140 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5144 if (mddev
->pers
== NULL
)
5147 rdev
= find_rdev(mddev
, dev
);
5151 md_error(mddev
, rdev
);
5156 * We have a problem here : there is no easy way to give a CHS
5157 * virtual geometry. We currently pretend that we have a 2 heads
5158 * 4 sectors (with a BIG number of cylinders...). This drives
5159 * dosfs just mad... ;-)
5161 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5163 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5167 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
5171 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5172 unsigned int cmd
, unsigned long arg
)
5175 void __user
*argp
= (void __user
*)arg
;
5176 mddev_t
*mddev
= NULL
;
5178 if (!capable(CAP_SYS_ADMIN
))
5182 * Commands dealing with the RAID driver but not any
5188 err
= get_version(argp
);
5191 case PRINT_RAID_DEBUG
:
5199 autostart_arrays(arg
);
5206 * Commands creating/starting a new array:
5209 mddev
= bdev
->bd_disk
->private_data
;
5216 err
= mddev_lock(mddev
);
5219 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5226 case SET_ARRAY_INFO
:
5228 mdu_array_info_t info
;
5230 memset(&info
, 0, sizeof(info
));
5231 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5236 err
= update_array_info(mddev
, &info
);
5238 printk(KERN_WARNING
"md: couldn't update"
5239 " array info. %d\n", err
);
5244 if (!list_empty(&mddev
->disks
)) {
5246 "md: array %s already has disks!\n",
5251 if (mddev
->raid_disks
) {
5253 "md: array %s already initialised!\n",
5258 err
= set_array_info(mddev
, &info
);
5260 printk(KERN_WARNING
"md: couldn't set"
5261 " array info. %d\n", err
);
5271 * Commands querying/configuring an existing array:
5273 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5274 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5275 if ((!mddev
->raid_disks
&& !mddev
->external
)
5276 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5277 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5278 && cmd
!= GET_BITMAP_FILE
) {
5284 * Commands even a read-only array can execute:
5288 case GET_ARRAY_INFO
:
5289 err
= get_array_info(mddev
, argp
);
5292 case GET_BITMAP_FILE
:
5293 err
= get_bitmap_file(mddev
, argp
);
5297 err
= get_disk_info(mddev
, argp
);
5300 case RESTART_ARRAY_RW
:
5301 err
= restart_array(mddev
);
5305 err
= do_md_stop(mddev
, 0, 1);
5309 err
= do_md_stop(mddev
, 1, 1);
5315 * The remaining ioctls are changing the state of the
5316 * superblock, so we do not allow them on read-only arrays.
5317 * However non-MD ioctls (e.g. get-size) will still come through
5318 * here and hit the 'default' below, so only disallow
5319 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5321 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5322 if (mddev
->ro
== 2) {
5324 sysfs_notify_dirent(mddev
->sysfs_state
);
5325 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5326 md_wakeup_thread(mddev
->thread
);
5337 mdu_disk_info_t info
;
5338 if (copy_from_user(&info
, argp
, sizeof(info
)))
5341 err
= add_new_disk(mddev
, &info
);
5345 case HOT_REMOVE_DISK
:
5346 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5350 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5353 case SET_DISK_FAULTY
:
5354 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5358 err
= do_md_run(mddev
);
5361 case SET_BITMAP_FILE
:
5362 err
= set_bitmap_file(mddev
, (int)arg
);
5372 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5374 mddev
->hold_active
= 0;
5375 mddev_unlock(mddev
);
5385 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5388 * Succeed if we can lock the mddev, which confirms that
5389 * it isn't being stopped right now.
5391 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5394 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5395 /* we are racing with mddev_put which is discarding this
5399 /* Wait until bdev->bd_disk is definitely gone */
5400 flush_scheduled_work();
5401 /* Then retry the open from the top */
5402 return -ERESTARTSYS
;
5404 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5406 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5410 atomic_inc(&mddev
->openers
);
5411 mddev_unlock(mddev
);
5413 check_disk_change(bdev
);
5418 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5420 mddev_t
*mddev
= disk
->private_data
;
5423 atomic_dec(&mddev
->openers
);
5429 static int md_media_changed(struct gendisk
*disk
)
5431 mddev_t
*mddev
= disk
->private_data
;
5433 return mddev
->changed
;
5436 static int md_revalidate(struct gendisk
*disk
)
5438 mddev_t
*mddev
= disk
->private_data
;
5443 static struct block_device_operations md_fops
=
5445 .owner
= THIS_MODULE
,
5447 .release
= md_release
,
5448 .locked_ioctl
= md_ioctl
,
5449 .getgeo
= md_getgeo
,
5450 .media_changed
= md_media_changed
,
5451 .revalidate_disk
= md_revalidate
,
5454 static int md_thread(void * arg
)
5456 mdk_thread_t
*thread
= arg
;
5459 * md_thread is a 'system-thread', it's priority should be very
5460 * high. We avoid resource deadlocks individually in each
5461 * raid personality. (RAID5 does preallocation) We also use RR and
5462 * the very same RT priority as kswapd, thus we will never get
5463 * into a priority inversion deadlock.
5465 * we definitely have to have equal or higher priority than
5466 * bdflush, otherwise bdflush will deadlock if there are too
5467 * many dirty RAID5 blocks.
5470 allow_signal(SIGKILL
);
5471 while (!kthread_should_stop()) {
5473 /* We need to wait INTERRUPTIBLE so that
5474 * we don't add to the load-average.
5475 * That means we need to be sure no signals are
5478 if (signal_pending(current
))
5479 flush_signals(current
);
5481 wait_event_interruptible_timeout
5483 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5484 || kthread_should_stop(),
5487 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5489 thread
->run(thread
->mddev
);
5495 void md_wakeup_thread(mdk_thread_t
*thread
)
5498 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5499 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5500 wake_up(&thread
->wqueue
);
5504 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5507 mdk_thread_t
*thread
;
5509 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5513 init_waitqueue_head(&thread
->wqueue
);
5516 thread
->mddev
= mddev
;
5517 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5518 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5519 if (IS_ERR(thread
->tsk
)) {
5526 void md_unregister_thread(mdk_thread_t
*thread
)
5530 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5532 kthread_stop(thread
->tsk
);
5536 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5543 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5546 if (mddev
->external
)
5547 set_bit(Blocked
, &rdev
->flags
);
5549 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5551 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5552 __builtin_return_address(0),__builtin_return_address(1),
5553 __builtin_return_address(2),__builtin_return_address(3));
5557 if (!mddev
->pers
->error_handler
)
5559 mddev
->pers
->error_handler(mddev
,rdev
);
5560 if (mddev
->degraded
)
5561 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5562 set_bit(StateChanged
, &rdev
->flags
);
5563 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5564 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5565 md_wakeup_thread(mddev
->thread
);
5566 md_new_event_inintr(mddev
);
5569 /* seq_file implementation /proc/mdstat */
5571 static void status_unused(struct seq_file
*seq
)
5576 seq_printf(seq
, "unused devices: ");
5578 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
5579 char b
[BDEVNAME_SIZE
];
5581 seq_printf(seq
, "%s ",
5582 bdevname(rdev
->bdev
,b
));
5585 seq_printf(seq
, "<none>");
5587 seq_printf(seq
, "\n");
5591 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5593 sector_t max_blocks
, resync
, res
;
5594 unsigned long dt
, db
, rt
;
5596 unsigned int per_milli
;
5598 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5600 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5601 max_blocks
= mddev
->resync_max_sectors
>> 1;
5603 max_blocks
= mddev
->dev_sectors
/ 2;
5606 * Should not happen.
5612 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5613 * in a sector_t, and (max_blocks>>scale) will fit in a
5614 * u32, as those are the requirements for sector_div.
5615 * Thus 'scale' must be at least 10
5618 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5619 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5622 res
= (resync
>>scale
)*1000;
5623 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5627 int i
, x
= per_milli
/50, y
= 20-x
;
5628 seq_printf(seq
, "[");
5629 for (i
= 0; i
< x
; i
++)
5630 seq_printf(seq
, "=");
5631 seq_printf(seq
, ">");
5632 for (i
= 0; i
< y
; i
++)
5633 seq_printf(seq
, ".");
5634 seq_printf(seq
, "] ");
5636 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5637 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5639 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5641 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5642 "resync" : "recovery"))),
5643 per_milli
/10, per_milli
% 10,
5644 (unsigned long long) resync
,
5645 (unsigned long long) max_blocks
);
5648 * We do not want to overflow, so the order of operands and
5649 * the * 100 / 100 trick are important. We do a +1 to be
5650 * safe against division by zero. We only estimate anyway.
5652 * dt: time from mark until now
5653 * db: blocks written from mark until now
5654 * rt: remaining time
5656 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5658 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5659 - mddev
->resync_mark_cnt
;
5660 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5662 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5664 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5667 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5669 struct list_head
*tmp
;
5679 spin_lock(&all_mddevs_lock
);
5680 list_for_each(tmp
,&all_mddevs
)
5682 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5684 spin_unlock(&all_mddevs_lock
);
5687 spin_unlock(&all_mddevs_lock
);
5689 return (void*)2;/* tail */
5693 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5695 struct list_head
*tmp
;
5696 mddev_t
*next_mddev
, *mddev
= v
;
5702 spin_lock(&all_mddevs_lock
);
5704 tmp
= all_mddevs
.next
;
5706 tmp
= mddev
->all_mddevs
.next
;
5707 if (tmp
!= &all_mddevs
)
5708 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5710 next_mddev
= (void*)2;
5713 spin_unlock(&all_mddevs_lock
);
5721 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5725 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5729 struct mdstat_info
{
5733 static int md_seq_show(struct seq_file
*seq
, void *v
)
5738 struct mdstat_info
*mi
= seq
->private;
5739 struct bitmap
*bitmap
;
5741 if (v
== (void*)1) {
5742 struct mdk_personality
*pers
;
5743 seq_printf(seq
, "Personalities : ");
5744 spin_lock(&pers_lock
);
5745 list_for_each_entry(pers
, &pers_list
, list
)
5746 seq_printf(seq
, "[%s] ", pers
->name
);
5748 spin_unlock(&pers_lock
);
5749 seq_printf(seq
, "\n");
5750 mi
->event
= atomic_read(&md_event_count
);
5753 if (v
== (void*)2) {
5758 if (mddev_lock(mddev
) < 0)
5761 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5762 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5763 mddev
->pers
? "" : "in");
5766 seq_printf(seq
, " (read-only)");
5768 seq_printf(seq
, " (auto-read-only)");
5769 seq_printf(seq
, " %s", mddev
->pers
->name
);
5773 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5774 char b
[BDEVNAME_SIZE
];
5775 seq_printf(seq
, " %s[%d]",
5776 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5777 if (test_bit(WriteMostly
, &rdev
->flags
))
5778 seq_printf(seq
, "(W)");
5779 if (test_bit(Faulty
, &rdev
->flags
)) {
5780 seq_printf(seq
, "(F)");
5782 } else if (rdev
->raid_disk
< 0)
5783 seq_printf(seq
, "(S)"); /* spare */
5784 sectors
+= rdev
->sectors
;
5787 if (!list_empty(&mddev
->disks
)) {
5789 seq_printf(seq
, "\n %llu blocks",
5790 (unsigned long long)
5791 mddev
->array_sectors
/ 2);
5793 seq_printf(seq
, "\n %llu blocks",
5794 (unsigned long long)sectors
/ 2);
5796 if (mddev
->persistent
) {
5797 if (mddev
->major_version
!= 0 ||
5798 mddev
->minor_version
!= 90) {
5799 seq_printf(seq
," super %d.%d",
5800 mddev
->major_version
,
5801 mddev
->minor_version
);
5803 } else if (mddev
->external
)
5804 seq_printf(seq
, " super external:%s",
5805 mddev
->metadata_type
);
5807 seq_printf(seq
, " super non-persistent");
5810 mddev
->pers
->status(seq
, mddev
);
5811 seq_printf(seq
, "\n ");
5812 if (mddev
->pers
->sync_request
) {
5813 if (mddev
->curr_resync
> 2) {
5814 status_resync(seq
, mddev
);
5815 seq_printf(seq
, "\n ");
5816 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5817 seq_printf(seq
, "\tresync=DELAYED\n ");
5818 else if (mddev
->recovery_cp
< MaxSector
)
5819 seq_printf(seq
, "\tresync=PENDING\n ");
5822 seq_printf(seq
, "\n ");
5824 if ((bitmap
= mddev
->bitmap
)) {
5825 unsigned long chunk_kb
;
5826 unsigned long flags
;
5827 spin_lock_irqsave(&bitmap
->lock
, flags
);
5828 chunk_kb
= bitmap
->chunksize
>> 10;
5829 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5831 bitmap
->pages
- bitmap
->missing_pages
,
5833 (bitmap
->pages
- bitmap
->missing_pages
)
5834 << (PAGE_SHIFT
- 10),
5835 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5836 chunk_kb
? "KB" : "B");
5838 seq_printf(seq
, ", file: ");
5839 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5842 seq_printf(seq
, "\n");
5843 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5846 seq_printf(seq
, "\n");
5848 mddev_unlock(mddev
);
5853 static struct seq_operations md_seq_ops
= {
5854 .start
= md_seq_start
,
5855 .next
= md_seq_next
,
5856 .stop
= md_seq_stop
,
5857 .show
= md_seq_show
,
5860 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5863 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5867 error
= seq_open(file
, &md_seq_ops
);
5871 struct seq_file
*p
= file
->private_data
;
5873 mi
->event
= atomic_read(&md_event_count
);
5878 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5880 struct seq_file
*m
= filp
->private_data
;
5881 struct mdstat_info
*mi
= m
->private;
5884 poll_wait(filp
, &md_event_waiters
, wait
);
5886 /* always allow read */
5887 mask
= POLLIN
| POLLRDNORM
;
5889 if (mi
->event
!= atomic_read(&md_event_count
))
5890 mask
|= POLLERR
| POLLPRI
;
5894 static const struct file_operations md_seq_fops
= {
5895 .owner
= THIS_MODULE
,
5896 .open
= md_seq_open
,
5898 .llseek
= seq_lseek
,
5899 .release
= seq_release_private
,
5900 .poll
= mdstat_poll
,
5903 int register_md_personality(struct mdk_personality
*p
)
5905 spin_lock(&pers_lock
);
5906 list_add_tail(&p
->list
, &pers_list
);
5907 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5908 spin_unlock(&pers_lock
);
5912 int unregister_md_personality(struct mdk_personality
*p
)
5914 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5915 spin_lock(&pers_lock
);
5916 list_del_init(&p
->list
);
5917 spin_unlock(&pers_lock
);
5921 static int is_mddev_idle(mddev_t
*mddev
, int init
)
5929 rdev_for_each_rcu(rdev
, mddev
) {
5930 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5931 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
5932 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
5933 atomic_read(&disk
->sync_io
);
5934 /* sync IO will cause sync_io to increase before the disk_stats
5935 * as sync_io is counted when a request starts, and
5936 * disk_stats is counted when it completes.
5937 * So resync activity will cause curr_events to be smaller than
5938 * when there was no such activity.
5939 * non-sync IO will cause disk_stat to increase without
5940 * increasing sync_io so curr_events will (eventually)
5941 * be larger than it was before. Once it becomes
5942 * substantially larger, the test below will cause
5943 * the array to appear non-idle, and resync will slow
5945 * If there is a lot of outstanding resync activity when
5946 * we set last_event to curr_events, then all that activity
5947 * completing might cause the array to appear non-idle
5948 * and resync will be slowed down even though there might
5949 * not have been non-resync activity. This will only
5950 * happen once though. 'last_events' will soon reflect
5951 * the state where there is little or no outstanding
5952 * resync requests, and further resync activity will
5953 * always make curr_events less than last_events.
5956 if (init
|| curr_events
- rdev
->last_events
> 64) {
5957 rdev
->last_events
= curr_events
;
5965 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5967 /* another "blocks" (512byte) blocks have been synced */
5968 atomic_sub(blocks
, &mddev
->recovery_active
);
5969 wake_up(&mddev
->recovery_wait
);
5971 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5972 md_wakeup_thread(mddev
->thread
);
5973 // stop recovery, signal do_sync ....
5978 /* md_write_start(mddev, bi)
5979 * If we need to update some array metadata (e.g. 'active' flag
5980 * in superblock) before writing, schedule a superblock update
5981 * and wait for it to complete.
5983 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5986 if (bio_data_dir(bi
) != WRITE
)
5989 BUG_ON(mddev
->ro
== 1);
5990 if (mddev
->ro
== 2) {
5991 /* need to switch to read/write */
5993 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5994 md_wakeup_thread(mddev
->thread
);
5995 md_wakeup_thread(mddev
->sync_thread
);
5998 atomic_inc(&mddev
->writes_pending
);
5999 if (mddev
->safemode
== 1)
6000 mddev
->safemode
= 0;
6001 if (mddev
->in_sync
) {
6002 spin_lock_irq(&mddev
->write_lock
);
6003 if (mddev
->in_sync
) {
6005 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6006 md_wakeup_thread(mddev
->thread
);
6009 spin_unlock_irq(&mddev
->write_lock
);
6012 sysfs_notify_dirent(mddev
->sysfs_state
);
6013 wait_event(mddev
->sb_wait
,
6014 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
6015 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6018 void md_write_end(mddev_t
*mddev
)
6020 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6021 if (mddev
->safemode
== 2)
6022 md_wakeup_thread(mddev
->thread
);
6023 else if (mddev
->safemode_delay
)
6024 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6028 /* md_allow_write(mddev)
6029 * Calling this ensures that the array is marked 'active' so that writes
6030 * may proceed without blocking. It is important to call this before
6031 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6032 * Must be called with mddev_lock held.
6034 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6035 * is dropped, so return -EAGAIN after notifying userspace.
6037 int md_allow_write(mddev_t
*mddev
)
6043 if (!mddev
->pers
->sync_request
)
6046 spin_lock_irq(&mddev
->write_lock
);
6047 if (mddev
->in_sync
) {
6049 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6050 if (mddev
->safemode_delay
&&
6051 mddev
->safemode
== 0)
6052 mddev
->safemode
= 1;
6053 spin_unlock_irq(&mddev
->write_lock
);
6054 md_update_sb(mddev
, 0);
6055 sysfs_notify_dirent(mddev
->sysfs_state
);
6057 spin_unlock_irq(&mddev
->write_lock
);
6059 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
6064 EXPORT_SYMBOL_GPL(md_allow_write
);
6066 #define SYNC_MARKS 10
6067 #define SYNC_MARK_STEP (3*HZ)
6068 void md_do_sync(mddev_t
*mddev
)
6071 unsigned int currspeed
= 0,
6073 sector_t max_sectors
,j
, io_sectors
;
6074 unsigned long mark
[SYNC_MARKS
];
6075 sector_t mark_cnt
[SYNC_MARKS
];
6077 struct list_head
*tmp
;
6078 sector_t last_check
;
6083 /* just incase thread restarts... */
6084 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6086 if (mddev
->ro
) /* never try to sync a read-only array */
6089 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6090 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6091 desc
= "data-check";
6092 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6093 desc
= "requested-resync";
6096 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6101 /* we overload curr_resync somewhat here.
6102 * 0 == not engaged in resync at all
6103 * 2 == checking that there is no conflict with another sync
6104 * 1 == like 2, but have yielded to allow conflicting resync to
6106 * other == active in resync - this many blocks
6108 * Before starting a resync we must have set curr_resync to
6109 * 2, and then checked that every "conflicting" array has curr_resync
6110 * less than ours. When we find one that is the same or higher
6111 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6112 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6113 * This will mean we have to start checking from the beginning again.
6118 mddev
->curr_resync
= 2;
6121 if (kthread_should_stop()) {
6122 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6125 for_each_mddev(mddev2
, tmp
) {
6126 if (mddev2
== mddev
)
6128 if (!mddev
->parallel_resync
6129 && mddev2
->curr_resync
6130 && match_mddev_units(mddev
, mddev2
)) {
6132 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6133 /* arbitrarily yield */
6134 mddev
->curr_resync
= 1;
6135 wake_up(&resync_wait
);
6137 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6138 /* no need to wait here, we can wait the next
6139 * time 'round when curr_resync == 2
6142 /* We need to wait 'interruptible' so as not to
6143 * contribute to the load average, and not to
6144 * be caught by 'softlockup'
6146 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6147 if (!kthread_should_stop() &&
6148 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6149 printk(KERN_INFO
"md: delaying %s of %s"
6150 " until %s has finished (they"
6151 " share one or more physical units)\n",
6152 desc
, mdname(mddev
), mdname(mddev2
));
6154 if (signal_pending(current
))
6155 flush_signals(current
);
6157 finish_wait(&resync_wait
, &wq
);
6160 finish_wait(&resync_wait
, &wq
);
6163 } while (mddev
->curr_resync
< 2);
6166 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6167 /* resync follows the size requested by the personality,
6168 * which defaults to physical size, but can be virtual size
6170 max_sectors
= mddev
->resync_max_sectors
;
6171 mddev
->resync_mismatches
= 0;
6172 /* we don't use the checkpoint if there's a bitmap */
6173 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6174 j
= mddev
->resync_min
;
6175 else if (!mddev
->bitmap
)
6176 j
= mddev
->recovery_cp
;
6178 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6179 max_sectors
= mddev
->dev_sectors
;
6181 /* recovery follows the physical size of devices */
6182 max_sectors
= mddev
->dev_sectors
;
6184 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6185 if (rdev
->raid_disk
>= 0 &&
6186 !test_bit(Faulty
, &rdev
->flags
) &&
6187 !test_bit(In_sync
, &rdev
->flags
) &&
6188 rdev
->recovery_offset
< j
)
6189 j
= rdev
->recovery_offset
;
6192 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6193 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6194 " %d KB/sec/disk.\n", speed_min(mddev
));
6195 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6196 "(but not more than %d KB/sec) for %s.\n",
6197 speed_max(mddev
), desc
);
6199 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6202 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6204 mark_cnt
[m
] = io_sectors
;
6207 mddev
->resync_mark
= mark
[last_mark
];
6208 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6211 * Tune reconstruction:
6213 window
= 32*(PAGE_SIZE
/512);
6214 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6215 window
/2,(unsigned long long) max_sectors
/2);
6217 atomic_set(&mddev
->recovery_active
, 0);
6222 "md: resuming %s of %s from checkpoint.\n",
6223 desc
, mdname(mddev
));
6224 mddev
->curr_resync
= j
;
6227 while (j
< max_sectors
) {
6231 if (j
>= mddev
->resync_max
) {
6232 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6233 wait_event(mddev
->recovery_wait
,
6234 mddev
->resync_max
> j
6235 || kthread_should_stop());
6237 if (kthread_should_stop())
6240 if (mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6241 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6242 > (max_sectors
>> 4)) {
6243 /* time to update curr_resync_completed */
6244 blk_unplug(mddev
->queue
);
6245 wait_event(mddev
->recovery_wait
,
6246 atomic_read(&mddev
->recovery_active
) == 0);
6247 mddev
->curr_resync_completed
=
6249 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6251 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6252 currspeed
< speed_min(mddev
));
6254 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6258 if (!skipped
) { /* actual IO requested */
6259 io_sectors
+= sectors
;
6260 atomic_add(sectors
, &mddev
->recovery_active
);
6264 if (j
>1) mddev
->curr_resync
= j
;
6265 mddev
->curr_mark_cnt
= io_sectors
;
6266 if (last_check
== 0)
6267 /* this is the earliers that rebuilt will be
6268 * visible in /proc/mdstat
6270 md_new_event(mddev
);
6272 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6275 last_check
= io_sectors
;
6277 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6281 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6283 int next
= (last_mark
+1) % SYNC_MARKS
;
6285 mddev
->resync_mark
= mark
[next
];
6286 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6287 mark
[next
] = jiffies
;
6288 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6293 if (kthread_should_stop())
6298 * this loop exits only if either when we are slower than
6299 * the 'hard' speed limit, or the system was IO-idle for
6301 * the system might be non-idle CPU-wise, but we only care
6302 * about not overloading the IO subsystem. (things like an
6303 * e2fsck being done on the RAID array should execute fast)
6305 blk_unplug(mddev
->queue
);
6308 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6309 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6311 if (currspeed
> speed_min(mddev
)) {
6312 if ((currspeed
> speed_max(mddev
)) ||
6313 !is_mddev_idle(mddev
, 0)) {
6319 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6321 * this also signals 'finished resyncing' to md_stop
6324 blk_unplug(mddev
->queue
);
6326 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6328 /* tell personality that we are finished */
6329 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6331 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6332 mddev
->curr_resync
> 2) {
6333 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6334 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6335 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6337 "md: checkpointing %s of %s.\n",
6338 desc
, mdname(mddev
));
6339 mddev
->recovery_cp
= mddev
->curr_resync
;
6342 mddev
->recovery_cp
= MaxSector
;
6344 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6345 mddev
->curr_resync
= MaxSector
;
6346 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6347 if (rdev
->raid_disk
>= 0 &&
6348 !test_bit(Faulty
, &rdev
->flags
) &&
6349 !test_bit(In_sync
, &rdev
->flags
) &&
6350 rdev
->recovery_offset
< mddev
->curr_resync
)
6351 rdev
->recovery_offset
= mddev
->curr_resync
;
6354 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6357 mddev
->curr_resync
= 0;
6358 mddev
->resync_min
= 0;
6359 mddev
->resync_max
= MaxSector
;
6360 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6361 wake_up(&resync_wait
);
6362 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6363 md_wakeup_thread(mddev
->thread
);
6368 * got a signal, exit.
6371 "md: md_do_sync() got signal ... exiting\n");
6372 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6376 EXPORT_SYMBOL_GPL(md_do_sync
);
6379 static int remove_and_add_spares(mddev_t
*mddev
)
6384 mddev
->curr_resync_completed
= 0;
6386 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6387 if (rdev
->raid_disk
>= 0 &&
6388 !test_bit(Blocked
, &rdev
->flags
) &&
6389 (test_bit(Faulty
, &rdev
->flags
) ||
6390 ! test_bit(In_sync
, &rdev
->flags
)) &&
6391 atomic_read(&rdev
->nr_pending
)==0) {
6392 if (mddev
->pers
->hot_remove_disk(
6393 mddev
, rdev
->raid_disk
)==0) {
6395 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6396 sysfs_remove_link(&mddev
->kobj
, nm
);
6397 rdev
->raid_disk
= -1;
6401 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6402 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6403 if (rdev
->raid_disk
>= 0 &&
6404 !test_bit(In_sync
, &rdev
->flags
) &&
6405 !test_bit(Blocked
, &rdev
->flags
))
6407 if (rdev
->raid_disk
< 0
6408 && !test_bit(Faulty
, &rdev
->flags
)) {
6409 rdev
->recovery_offset
= 0;
6411 hot_add_disk(mddev
, rdev
) == 0) {
6413 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6414 if (sysfs_create_link(&mddev
->kobj
,
6417 "md: cannot register "
6421 md_new_event(mddev
);
6430 * This routine is regularly called by all per-raid-array threads to
6431 * deal with generic issues like resync and super-block update.
6432 * Raid personalities that don't have a thread (linear/raid0) do not
6433 * need this as they never do any recovery or update the superblock.
6435 * It does not do any resync itself, but rather "forks" off other threads
6436 * to do that as needed.
6437 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6438 * "->recovery" and create a thread at ->sync_thread.
6439 * When the thread finishes it sets MD_RECOVERY_DONE
6440 * and wakeups up this thread which will reap the thread and finish up.
6441 * This thread also removes any faulty devices (with nr_pending == 0).
6443 * The overall approach is:
6444 * 1/ if the superblock needs updating, update it.
6445 * 2/ If a recovery thread is running, don't do anything else.
6446 * 3/ If recovery has finished, clean up, possibly marking spares active.
6447 * 4/ If there are any faulty devices, remove them.
6448 * 5/ If array is degraded, try to add spares devices
6449 * 6/ If array has spares or is not in-sync, start a resync thread.
6451 void md_check_recovery(mddev_t
*mddev
)
6457 bitmap_daemon_work(mddev
->bitmap
);
6462 if (signal_pending(current
)) {
6463 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6464 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6466 mddev
->safemode
= 2;
6468 flush_signals(current
);
6471 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6474 (mddev
->flags
&& !mddev
->external
) ||
6475 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6476 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6477 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6478 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6479 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6483 if (mddev_trylock(mddev
)) {
6487 /* Only thing we do on a ro array is remove
6490 remove_and_add_spares(mddev
);
6491 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6495 if (!mddev
->external
) {
6497 spin_lock_irq(&mddev
->write_lock
);
6498 if (mddev
->safemode
&&
6499 !atomic_read(&mddev
->writes_pending
) &&
6501 mddev
->recovery_cp
== MaxSector
) {
6504 if (mddev
->persistent
)
6505 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6507 if (mddev
->safemode
== 1)
6508 mddev
->safemode
= 0;
6509 spin_unlock_irq(&mddev
->write_lock
);
6511 sysfs_notify_dirent(mddev
->sysfs_state
);
6515 md_update_sb(mddev
, 0);
6517 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6518 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6519 sysfs_notify_dirent(rdev
->sysfs_state
);
6522 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6523 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6524 /* resync/recovery still happening */
6525 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6528 if (mddev
->sync_thread
) {
6529 /* resync has finished, collect result */
6530 md_unregister_thread(mddev
->sync_thread
);
6531 mddev
->sync_thread
= NULL
;
6532 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6533 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6535 /* activate any spares */
6536 if (mddev
->pers
->spare_active(mddev
))
6537 sysfs_notify(&mddev
->kobj
, NULL
,
6540 md_update_sb(mddev
, 1);
6542 /* if array is no-longer degraded, then any saved_raid_disk
6543 * information must be scrapped
6545 if (!mddev
->degraded
)
6546 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6547 rdev
->saved_raid_disk
= -1;
6549 mddev
->recovery
= 0;
6550 /* flag recovery needed just to double check */
6551 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6552 sysfs_notify_dirent(mddev
->sysfs_action
);
6553 md_new_event(mddev
);
6556 /* Set RUNNING before clearing NEEDED to avoid
6557 * any transients in the value of "sync_action".
6559 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6560 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6561 /* Clear some bits that don't mean anything, but
6564 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6565 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6567 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6569 /* no recovery is running.
6570 * remove any failed drives, then
6571 * add spares if possible.
6572 * Spare are also removed and re-added, to allow
6573 * the personality to fail the re-add.
6576 if (mddev
->reshape_position
!= MaxSector
) {
6577 if (mddev
->pers
->check_reshape(mddev
) != 0)
6578 /* Cannot proceed */
6580 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6581 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6582 } else if ((spares
= remove_and_add_spares(mddev
))) {
6583 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6584 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6585 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6586 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6587 } else if (mddev
->recovery_cp
< MaxSector
) {
6588 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6589 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6590 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6591 /* nothing to be done ... */
6594 if (mddev
->pers
->sync_request
) {
6595 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6596 /* We are adding a device or devices to an array
6597 * which has the bitmap stored on all devices.
6598 * So make sure all bitmap pages get written
6600 bitmap_write_all(mddev
->bitmap
);
6602 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6605 if (!mddev
->sync_thread
) {
6606 printk(KERN_ERR
"%s: could not start resync"
6609 /* leave the spares where they are, it shouldn't hurt */
6610 mddev
->recovery
= 0;
6612 md_wakeup_thread(mddev
->sync_thread
);
6613 sysfs_notify_dirent(mddev
->sysfs_action
);
6614 md_new_event(mddev
);
6617 if (!mddev
->sync_thread
) {
6618 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6619 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6621 if (mddev
->sysfs_action
)
6622 sysfs_notify_dirent(mddev
->sysfs_action
);
6624 mddev_unlock(mddev
);
6628 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6630 sysfs_notify_dirent(rdev
->sysfs_state
);
6631 wait_event_timeout(rdev
->blocked_wait
,
6632 !test_bit(Blocked
, &rdev
->flags
),
6633 msecs_to_jiffies(5000));
6634 rdev_dec_pending(rdev
, mddev
);
6636 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6638 static int md_notify_reboot(struct notifier_block
*this,
6639 unsigned long code
, void *x
)
6641 struct list_head
*tmp
;
6644 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6646 printk(KERN_INFO
"md: stopping all md devices.\n");
6648 for_each_mddev(mddev
, tmp
)
6649 if (mddev_trylock(mddev
)) {
6650 /* Force a switch to readonly even array
6651 * appears to still be in use. Hence
6654 do_md_stop(mddev
, 1, 100);
6655 mddev_unlock(mddev
);
6658 * certain more exotic SCSI devices are known to be
6659 * volatile wrt too early system reboots. While the
6660 * right place to handle this issue is the given
6661 * driver, we do want to have a safe RAID driver ...
6668 static struct notifier_block md_notifier
= {
6669 .notifier_call
= md_notify_reboot
,
6671 .priority
= INT_MAX
, /* before any real devices */
6674 static void md_geninit(void)
6676 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6678 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6681 static int __init
md_init(void)
6683 if (register_blkdev(MD_MAJOR
, "md"))
6685 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6686 unregister_blkdev(MD_MAJOR
, "md");
6689 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6690 md_probe
, NULL
, NULL
);
6691 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6692 md_probe
, NULL
, NULL
);
6694 register_reboot_notifier(&md_notifier
);
6695 raid_table_header
= register_sysctl_table(raid_root_table
);
6705 * Searches all registered partitions for autorun RAID arrays
6709 static LIST_HEAD(all_detected_devices
);
6710 struct detected_devices_node
{
6711 struct list_head list
;
6715 void md_autodetect_dev(dev_t dev
)
6717 struct detected_devices_node
*node_detected_dev
;
6719 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6720 if (node_detected_dev
) {
6721 node_detected_dev
->dev
= dev
;
6722 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6724 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6725 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6730 static void autostart_arrays(int part
)
6733 struct detected_devices_node
*node_detected_dev
;
6735 int i_scanned
, i_passed
;
6740 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6742 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6744 node_detected_dev
= list_entry(all_detected_devices
.next
,
6745 struct detected_devices_node
, list
);
6746 list_del(&node_detected_dev
->list
);
6747 dev
= node_detected_dev
->dev
;
6748 kfree(node_detected_dev
);
6749 rdev
= md_import_device(dev
,0, 90);
6753 if (test_bit(Faulty
, &rdev
->flags
)) {
6757 set_bit(AutoDetected
, &rdev
->flags
);
6758 list_add(&rdev
->same_set
, &pending_raid_disks
);
6762 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6763 i_scanned
, i_passed
);
6765 autorun_devices(part
);
6768 #endif /* !MODULE */
6770 static __exit
void md_exit(void)
6773 struct list_head
*tmp
;
6775 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
6776 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6778 unregister_blkdev(MD_MAJOR
,"md");
6779 unregister_blkdev(mdp_major
, "mdp");
6780 unregister_reboot_notifier(&md_notifier
);
6781 unregister_sysctl_table(raid_table_header
);
6782 remove_proc_entry("mdstat", NULL
);
6783 for_each_mddev(mddev
, tmp
) {
6784 export_array(mddev
);
6785 mddev
->hold_active
= 0;
6789 subsys_initcall(md_init
);
6790 module_exit(md_exit
)
6792 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6794 return sprintf(buffer
, "%d", start_readonly
);
6796 static int set_ro(const char *val
, struct kernel_param
*kp
)
6799 int num
= simple_strtoul(val
, &e
, 10);
6800 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6801 start_readonly
= num
;
6807 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6808 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6810 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
6812 EXPORT_SYMBOL(register_md_personality
);
6813 EXPORT_SYMBOL(unregister_md_personality
);
6814 EXPORT_SYMBOL(md_error
);
6815 EXPORT_SYMBOL(md_done_sync
);
6816 EXPORT_SYMBOL(md_write_start
);
6817 EXPORT_SYMBOL(md_write_end
);
6818 EXPORT_SYMBOL(md_register_thread
);
6819 EXPORT_SYMBOL(md_unregister_thread
);
6820 EXPORT_SYMBOL(md_wakeup_thread
);
6821 EXPORT_SYMBOL(md_check_recovery
);
6822 MODULE_LICENSE("GPL");
6824 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);