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/module.h>
36 #include <linux/config.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
45 #include <linux/poll.h>
46 #include <linux/mutex.h>
47 #include <linux/ctype.h>
49 #include <linux/init.h>
51 #include <linux/file.h>
54 #include <linux/kmod.h>
57 #include <asm/unaligned.h>
59 #define MAJOR_NR MD_MAJOR
62 /* 63 partitions with the alternate major number (mdp) */
63 #define MdpMinorShift 6
66 #define dprintk(x...) ((void)(DEBUG && printk(x)))
70 static void autostart_arrays (int part);
73 static LIST_HEAD(pers_list);
74 static DEFINE_SPINLOCK(pers_lock);
77 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
78 * is 1000 KB/sec, so the extra system load does not show up that much.
79 * Increase it if you want to have more _guaranteed_ speed. Note that
80 * the RAID driver will use the maximum available bandwidth if the IO
81 * subsystem is idle. There is also an 'absolute maximum' reconstruction
82 * speed limit - in case reconstruction slows down your system despite
85 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
86 * or /sys/block/mdX/md/sync_speed_{min,max}
89 static int sysctl_speed_limit_min = 1000;
90 static int sysctl_speed_limit_max = 200000;
91 static inline int speed_min(mddev_t *mddev)
93 return mddev->sync_speed_min ?
94 mddev->sync_speed_min : sysctl_speed_limit_min;
97 static inline int speed_max(mddev_t *mddev)
99 return mddev->sync_speed_max ?
100 mddev->sync_speed_max : sysctl_speed_limit_max;
103 static struct ctl_table_header *raid_table_header;
105 static ctl_table raid_table[] = {
107 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
108 .procname = "speed_limit_min",
109 .data = &sysctl_speed_limit_min,
110 .maxlen = sizeof(int),
112 .proc_handler = &proc_dointvec,
115 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
116 .procname = "speed_limit_max",
117 .data = &sysctl_speed_limit_max,
118 .maxlen = sizeof(int),
120 .proc_handler = &proc_dointvec,
125 static ctl_table raid_dir_table[] = {
127 .ctl_name = DEV_RAID,
136 static ctl_table raid_root_table[] = {
142 .child = raid_dir_table,
147 static struct block_device_operations md_fops;
149 static int start_readonly;
152 * We have a system wide 'event count' that is incremented
153 * on any 'interesting' event, and readers of /proc/mdstat
154 * can use 'poll' or 'select' to find out when the event
158 * start array, stop array, error, add device, remove device,
159 * start build, activate spare
161 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
162 static atomic_t md_event_count;
163 void md_new_event(mddev_t *mddev)
165 atomic_inc(&md_event_count);
166 wake_up(&md_event_waiters);
167 sysfs_notify(&mddev->kobj, NULL, "sync_action");
169 EXPORT_SYMBOL_GPL(md_new_event);
171 /* Alternate version that can be called from interrupts
172 * when calling sysfs_notify isn't needed.
174 void md_new_event_inintr(mddev_t *mddev)
176 atomic_inc(&md_event_count);
177 wake_up(&md_event_waiters);
181 * Enables to iterate over all existing md arrays
182 * all_mddevs_lock protects this list.
184 static LIST_HEAD(all_mddevs);
185 static DEFINE_SPINLOCK(all_mddevs_lock);
189 * iterates through all used mddevs in the system.
190 * We take care to grab the all_mddevs_lock whenever navigating
191 * the list, and to always hold a refcount when unlocked.
192 * Any code which breaks out of this loop while own
193 * a reference to the current mddev and must mddev_put it.
195 #define ITERATE_MDDEV(mddev,tmp) \
197 for (({ spin_lock(&all_mddevs_lock); \
198 tmp = all_mddevs.next; \
200 ({ if (tmp != &all_mddevs) \
201 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
202 spin_unlock(&all_mddevs_lock); \
203 if (mddev) mddev_put(mddev); \
204 mddev = list_entry(tmp, mddev_t, all_mddevs); \
205 tmp != &all_mddevs;}); \
206 ({ spin_lock(&all_mddevs_lock); \
211 static int md_fail_request (request_queue_t *q, struct bio *bio)
213 bio_io_error(bio, bio->bi_size);
217 static inline mddev_t *mddev_get(mddev_t *mddev)
219 atomic_inc(&mddev->active);
223 static void mddev_put(mddev_t *mddev)
225 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
227 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
228 list_del(&mddev->all_mddevs);
229 spin_unlock(&all_mddevs_lock);
230 blk_cleanup_queue(mddev->queue);
231 kobject_unregister(&mddev->kobj);
233 spin_unlock(&all_mddevs_lock);
236 static mddev_t * mddev_find(dev_t unit)
238 mddev_t *mddev, *new = NULL;
241 spin_lock(&all_mddevs_lock);
242 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
243 if (mddev->unit == unit) {
245 spin_unlock(&all_mddevs_lock);
251 list_add(&new->all_mddevs, &all_mddevs);
252 spin_unlock(&all_mddevs_lock);
255 spin_unlock(&all_mddevs_lock);
257 new = kzalloc(sizeof(*new), GFP_KERNEL);
262 if (MAJOR(unit) == MD_MAJOR)
263 new->md_minor = MINOR(unit);
265 new->md_minor = MINOR(unit) >> MdpMinorShift;
267 mutex_init(&new->reconfig_mutex);
268 INIT_LIST_HEAD(&new->disks);
269 INIT_LIST_HEAD(&new->all_mddevs);
270 init_timer(&new->safemode_timer);
271 atomic_set(&new->active, 1);
272 spin_lock_init(&new->write_lock);
273 init_waitqueue_head(&new->sb_wait);
275 new->queue = blk_alloc_queue(GFP_KERNEL);
280 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
282 blk_queue_make_request(new->queue, md_fail_request);
287 static inline int mddev_lock(mddev_t * mddev)
289 return mutex_lock_interruptible(&mddev->reconfig_mutex);
292 static inline int mddev_trylock(mddev_t * mddev)
294 return mutex_trylock(&mddev->reconfig_mutex);
297 static inline void mddev_unlock(mddev_t * mddev)
299 mutex_unlock(&mddev->reconfig_mutex);
301 md_wakeup_thread(mddev->thread);
304 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
307 struct list_head *tmp;
309 ITERATE_RDEV(mddev,rdev,tmp) {
310 if (rdev->desc_nr == nr)
316 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
318 struct list_head *tmp;
321 ITERATE_RDEV(mddev,rdev,tmp) {
322 if (rdev->bdev->bd_dev == dev)
328 static struct mdk_personality *find_pers(int level, char *clevel)
330 struct mdk_personality *pers;
331 list_for_each_entry(pers, &pers_list, list) {
332 if (level != LEVEL_NONE && pers->level == level)
334 if (strcmp(pers->name, clevel)==0)
340 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
342 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
343 return MD_NEW_SIZE_BLOCKS(size);
346 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
350 size = rdev->sb_offset;
353 size &= ~((sector_t)chunk_size/1024 - 1);
357 static int alloc_disk_sb(mdk_rdev_t * rdev)
362 rdev->sb_page = alloc_page(GFP_KERNEL);
363 if (!rdev->sb_page) {
364 printk(KERN_ALERT "md: out of memory.\n");
371 static void free_disk_sb(mdk_rdev_t * rdev)
374 put_page(rdev->sb_page);
376 rdev->sb_page = NULL;
383 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
385 mdk_rdev_t *rdev = bio->bi_private;
386 mddev_t *mddev = rdev->mddev;
390 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
391 md_error(mddev, rdev);
393 if (atomic_dec_and_test(&mddev->pending_writes))
394 wake_up(&mddev->sb_wait);
399 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
401 struct bio *bio2 = bio->bi_private;
402 mdk_rdev_t *rdev = bio2->bi_private;
403 mddev_t *mddev = rdev->mddev;
407 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
408 error == -EOPNOTSUPP) {
410 /* barriers don't appear to be supported :-( */
411 set_bit(BarriersNotsupp, &rdev->flags);
412 mddev->barriers_work = 0;
413 spin_lock_irqsave(&mddev->write_lock, flags);
414 bio2->bi_next = mddev->biolist;
415 mddev->biolist = bio2;
416 spin_unlock_irqrestore(&mddev->write_lock, flags);
417 wake_up(&mddev->sb_wait);
422 bio->bi_private = rdev;
423 return super_written(bio, bytes_done, error);
426 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
427 sector_t sector, int size, struct page *page)
429 /* write first size bytes of page to sector of rdev
430 * Increment mddev->pending_writes before returning
431 * and decrement it on completion, waking up sb_wait
432 * if zero is reached.
433 * If an error occurred, call md_error
435 * As we might need to resubmit the request if BIO_RW_BARRIER
436 * causes ENOTSUPP, we allocate a spare bio...
438 struct bio *bio = bio_alloc(GFP_NOIO, 1);
439 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
441 bio->bi_bdev = rdev->bdev;
442 bio->bi_sector = sector;
443 bio_add_page(bio, page, size, 0);
444 bio->bi_private = rdev;
445 bio->bi_end_io = super_written;
448 atomic_inc(&mddev->pending_writes);
449 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
451 rw |= (1<<BIO_RW_BARRIER);
452 rbio = bio_clone(bio, GFP_NOIO);
453 rbio->bi_private = bio;
454 rbio->bi_end_io = super_written_barrier;
455 submit_bio(rw, rbio);
460 void md_super_wait(mddev_t *mddev)
462 /* wait for all superblock writes that were scheduled to complete.
463 * if any had to be retried (due to BARRIER problems), retry them
467 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
468 if (atomic_read(&mddev->pending_writes)==0)
470 while (mddev->biolist) {
472 spin_lock_irq(&mddev->write_lock);
473 bio = mddev->biolist;
474 mddev->biolist = bio->bi_next ;
476 spin_unlock_irq(&mddev->write_lock);
477 submit_bio(bio->bi_rw, bio);
481 finish_wait(&mddev->sb_wait, &wq);
484 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
489 complete((struct completion*)bio->bi_private);
493 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
494 struct page *page, int rw)
496 struct bio *bio = bio_alloc(GFP_NOIO, 1);
497 struct completion event;
500 rw |= (1 << BIO_RW_SYNC);
503 bio->bi_sector = sector;
504 bio_add_page(bio, page, size, 0);
505 init_completion(&event);
506 bio->bi_private = &event;
507 bio->bi_end_io = bi_complete;
509 wait_for_completion(&event);
511 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
515 EXPORT_SYMBOL_GPL(sync_page_io);
517 static int read_disk_sb(mdk_rdev_t * rdev, int size)
519 char b[BDEVNAME_SIZE];
520 if (!rdev->sb_page) {
528 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
534 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
535 bdevname(rdev->bdev,b));
539 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
541 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
542 (sb1->set_uuid1 == sb2->set_uuid1) &&
543 (sb1->set_uuid2 == sb2->set_uuid2) &&
544 (sb1->set_uuid3 == sb2->set_uuid3))
552 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
555 mdp_super_t *tmp1, *tmp2;
557 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
558 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
560 if (!tmp1 || !tmp2) {
562 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
570 * nr_disks is not constant
575 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
586 static unsigned int calc_sb_csum(mdp_super_t * sb)
588 unsigned int disk_csum, csum;
590 disk_csum = sb->sb_csum;
592 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
593 sb->sb_csum = disk_csum;
599 * Handle superblock details.
600 * We want to be able to handle multiple superblock formats
601 * so we have a common interface to them all, and an array of
602 * different handlers.
603 * We rely on user-space to write the initial superblock, and support
604 * reading and updating of superblocks.
605 * Interface methods are:
606 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
607 * loads and validates a superblock on dev.
608 * if refdev != NULL, compare superblocks on both devices
610 * 0 - dev has a superblock that is compatible with refdev
611 * 1 - dev has a superblock that is compatible and newer than refdev
612 * so dev should be used as the refdev in future
613 * -EINVAL superblock incompatible or invalid
614 * -othererror e.g. -EIO
616 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
617 * Verify that dev is acceptable into mddev.
618 * The first time, mddev->raid_disks will be 0, and data from
619 * dev should be merged in. Subsequent calls check that dev
620 * is new enough. Return 0 or -EINVAL
622 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
623 * Update the superblock for rdev with data in mddev
624 * This does not write to disc.
630 struct module *owner;
631 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
632 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
633 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
637 * load_super for 0.90.0
639 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
641 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
647 * Calculate the position of the superblock,
648 * it's at the end of the disk.
650 * It also happens to be a multiple of 4Kb.
652 sb_offset = calc_dev_sboffset(rdev->bdev);
653 rdev->sb_offset = sb_offset;
655 ret = read_disk_sb(rdev, MD_SB_BYTES);
660 bdevname(rdev->bdev, b);
661 sb = (mdp_super_t*)page_address(rdev->sb_page);
663 if (sb->md_magic != MD_SB_MAGIC) {
664 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
669 if (sb->major_version != 0 ||
670 sb->minor_version < 90 ||
671 sb->minor_version > 91) {
672 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
673 sb->major_version, sb->minor_version,
678 if (sb->raid_disks <= 0)
681 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
682 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
687 rdev->preferred_minor = sb->md_minor;
688 rdev->data_offset = 0;
689 rdev->sb_size = MD_SB_BYTES;
691 if (sb->level == LEVEL_MULTIPATH)
694 rdev->desc_nr = sb->this_disk.number;
700 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
701 if (!uuid_equal(refsb, sb)) {
702 printk(KERN_WARNING "md: %s has different UUID to %s\n",
703 b, bdevname(refdev->bdev,b2));
706 if (!sb_equal(refsb, sb)) {
707 printk(KERN_WARNING "md: %s has same UUID"
708 " but different superblock to %s\n",
709 b, bdevname(refdev->bdev, b2));
713 ev2 = md_event(refsb);
719 rdev->size = calc_dev_size(rdev, sb->chunk_size);
721 if (rdev->size < sb->size && sb->level > 1)
722 /* "this cannot possibly happen" ... */
730 * validate_super for 0.90.0
732 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
735 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
737 rdev->raid_disk = -1;
739 if (mddev->raid_disks == 0) {
740 mddev->major_version = 0;
741 mddev->minor_version = sb->minor_version;
742 mddev->patch_version = sb->patch_version;
743 mddev->persistent = ! sb->not_persistent;
744 mddev->chunk_size = sb->chunk_size;
745 mddev->ctime = sb->ctime;
746 mddev->utime = sb->utime;
747 mddev->level = sb->level;
748 mddev->clevel[0] = 0;
749 mddev->layout = sb->layout;
750 mddev->raid_disks = sb->raid_disks;
751 mddev->size = sb->size;
752 mddev->events = md_event(sb);
753 mddev->bitmap_offset = 0;
754 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
756 if (mddev->minor_version >= 91) {
757 mddev->reshape_position = sb->reshape_position;
758 mddev->delta_disks = sb->delta_disks;
759 mddev->new_level = sb->new_level;
760 mddev->new_layout = sb->new_layout;
761 mddev->new_chunk = sb->new_chunk;
763 mddev->reshape_position = MaxSector;
764 mddev->delta_disks = 0;
765 mddev->new_level = mddev->level;
766 mddev->new_layout = mddev->layout;
767 mddev->new_chunk = mddev->chunk_size;
770 if (sb->state & (1<<MD_SB_CLEAN))
771 mddev->recovery_cp = MaxSector;
773 if (sb->events_hi == sb->cp_events_hi &&
774 sb->events_lo == sb->cp_events_lo) {
775 mddev->recovery_cp = sb->recovery_cp;
777 mddev->recovery_cp = 0;
780 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
781 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
782 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
783 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
785 mddev->max_disks = MD_SB_DISKS;
787 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
788 mddev->bitmap_file == NULL) {
789 if (mddev->level != 1 && mddev->level != 4
790 && mddev->level != 5 && mddev->level != 6
791 && mddev->level != 10) {
792 /* FIXME use a better test */
793 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
796 mddev->bitmap_offset = mddev->default_bitmap_offset;
799 } else if (mddev->pers == NULL) {
800 /* Insist on good event counter while assembling */
801 __u64 ev1 = md_event(sb);
803 if (ev1 < mddev->events)
805 } else if (mddev->bitmap) {
806 /* if adding to array with a bitmap, then we can accept an
807 * older device ... but not too old.
809 __u64 ev1 = md_event(sb);
810 if (ev1 < mddev->bitmap->events_cleared)
812 } else /* just a hot-add of a new device, leave raid_disk at -1 */
815 if (mddev->level != LEVEL_MULTIPATH) {
816 desc = sb->disks + rdev->desc_nr;
818 if (desc->state & (1<<MD_DISK_FAULTY))
819 set_bit(Faulty, &rdev->flags);
820 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
821 desc->raid_disk < mddev->raid_disks */) {
822 set_bit(In_sync, &rdev->flags);
823 rdev->raid_disk = desc->raid_disk;
825 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
826 set_bit(WriteMostly, &rdev->flags);
827 } else /* MULTIPATH are always insync */
828 set_bit(In_sync, &rdev->flags);
833 * sync_super for 0.90.0
835 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
838 struct list_head *tmp;
840 int next_spare = mddev->raid_disks;
843 /* make rdev->sb match mddev data..
846 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
847 * 3/ any empty disks < next_spare become removed
849 * disks[0] gets initialised to REMOVED because
850 * we cannot be sure from other fields if it has
851 * been initialised or not.
854 int active=0, working=0,failed=0,spare=0,nr_disks=0;
856 rdev->sb_size = MD_SB_BYTES;
858 sb = (mdp_super_t*)page_address(rdev->sb_page);
860 memset(sb, 0, sizeof(*sb));
862 sb->md_magic = MD_SB_MAGIC;
863 sb->major_version = mddev->major_version;
864 sb->patch_version = mddev->patch_version;
865 sb->gvalid_words = 0; /* ignored */
866 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
867 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
868 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
869 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
871 sb->ctime = mddev->ctime;
872 sb->level = mddev->level;
873 sb->size = mddev->size;
874 sb->raid_disks = mddev->raid_disks;
875 sb->md_minor = mddev->md_minor;
876 sb->not_persistent = !mddev->persistent;
877 sb->utime = mddev->utime;
879 sb->events_hi = (mddev->events>>32);
880 sb->events_lo = (u32)mddev->events;
882 if (mddev->reshape_position == MaxSector)
883 sb->minor_version = 90;
885 sb->minor_version = 91;
886 sb->reshape_position = mddev->reshape_position;
887 sb->new_level = mddev->new_level;
888 sb->delta_disks = mddev->delta_disks;
889 sb->new_layout = mddev->new_layout;
890 sb->new_chunk = mddev->new_chunk;
892 mddev->minor_version = sb->minor_version;
895 sb->recovery_cp = mddev->recovery_cp;
896 sb->cp_events_hi = (mddev->events>>32);
897 sb->cp_events_lo = (u32)mddev->events;
898 if (mddev->recovery_cp == MaxSector)
899 sb->state = (1<< MD_SB_CLEAN);
903 sb->layout = mddev->layout;
904 sb->chunk_size = mddev->chunk_size;
906 if (mddev->bitmap && mddev->bitmap_file == NULL)
907 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
909 sb->disks[0].state = (1<<MD_DISK_REMOVED);
910 ITERATE_RDEV(mddev,rdev2,tmp) {
913 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
914 && !test_bit(Faulty, &rdev2->flags))
915 desc_nr = rdev2->raid_disk;
917 desc_nr = next_spare++;
918 rdev2->desc_nr = desc_nr;
919 d = &sb->disks[rdev2->desc_nr];
921 d->number = rdev2->desc_nr;
922 d->major = MAJOR(rdev2->bdev->bd_dev);
923 d->minor = MINOR(rdev2->bdev->bd_dev);
924 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
925 && !test_bit(Faulty, &rdev2->flags))
926 d->raid_disk = rdev2->raid_disk;
928 d->raid_disk = rdev2->desc_nr; /* compatibility */
929 if (test_bit(Faulty, &rdev2->flags))
930 d->state = (1<<MD_DISK_FAULTY);
931 else if (test_bit(In_sync, &rdev2->flags)) {
932 d->state = (1<<MD_DISK_ACTIVE);
933 d->state |= (1<<MD_DISK_SYNC);
941 if (test_bit(WriteMostly, &rdev2->flags))
942 d->state |= (1<<MD_DISK_WRITEMOSTLY);
944 /* now set the "removed" and "faulty" bits on any missing devices */
945 for (i=0 ; i < mddev->raid_disks ; i++) {
946 mdp_disk_t *d = &sb->disks[i];
947 if (d->state == 0 && d->number == 0) {
950 d->state = (1<<MD_DISK_REMOVED);
951 d->state |= (1<<MD_DISK_FAULTY);
955 sb->nr_disks = nr_disks;
956 sb->active_disks = active;
957 sb->working_disks = working;
958 sb->failed_disks = failed;
959 sb->spare_disks = spare;
961 sb->this_disk = sb->disks[rdev->desc_nr];
962 sb->sb_csum = calc_sb_csum(sb);
966 * version 1 superblock
969 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
971 unsigned int disk_csum, csum;
972 unsigned long long newcsum;
973 int size = 256 + le32_to_cpu(sb->max_dev)*2;
974 unsigned int *isuper = (unsigned int*)sb;
977 disk_csum = sb->sb_csum;
980 for (i=0; size>=4; size -= 4 )
981 newcsum += le32_to_cpu(*isuper++);
984 newcsum += le16_to_cpu(*(unsigned short*) isuper);
986 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
987 sb->sb_csum = disk_csum;
988 return cpu_to_le32(csum);
991 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
993 struct mdp_superblock_1 *sb;
996 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1000 * Calculate the position of the superblock.
1001 * It is always aligned to a 4K boundary and
1002 * depeding on minor_version, it can be:
1003 * 0: At least 8K, but less than 12K, from end of device
1004 * 1: At start of device
1005 * 2: 4K from start of device.
1007 switch(minor_version) {
1009 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1011 sb_offset &= ~(sector_t)(4*2-1);
1012 /* convert from sectors to K */
1024 rdev->sb_offset = sb_offset;
1026 /* superblock is rarely larger than 1K, but it can be larger,
1027 * and it is safe to read 4k, so we do that
1029 ret = read_disk_sb(rdev, 4096);
1030 if (ret) return ret;
1033 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1035 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1036 sb->major_version != cpu_to_le32(1) ||
1037 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1038 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1039 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1042 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1043 printk("md: invalid superblock checksum on %s\n",
1044 bdevname(rdev->bdev,b));
1047 if (le64_to_cpu(sb->data_size) < 10) {
1048 printk("md: data_size too small on %s\n",
1049 bdevname(rdev->bdev,b));
1052 rdev->preferred_minor = 0xffff;
1053 rdev->data_offset = le64_to_cpu(sb->data_offset);
1054 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1056 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1057 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1058 if (rdev->sb_size & bmask)
1059 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1065 struct mdp_superblock_1 *refsb =
1066 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1068 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1069 sb->level != refsb->level ||
1070 sb->layout != refsb->layout ||
1071 sb->chunksize != refsb->chunksize) {
1072 printk(KERN_WARNING "md: %s has strangely different"
1073 " superblock to %s\n",
1074 bdevname(rdev->bdev,b),
1075 bdevname(refdev->bdev,b2));
1078 ev1 = le64_to_cpu(sb->events);
1079 ev2 = le64_to_cpu(refsb->events);
1087 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1089 rdev->size = rdev->sb_offset;
1090 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1092 rdev->size = le64_to_cpu(sb->data_size)/2;
1093 if (le32_to_cpu(sb->chunksize))
1094 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1096 if (le32_to_cpu(sb->size) > rdev->size*2)
1101 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1103 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1105 rdev->raid_disk = -1;
1107 if (mddev->raid_disks == 0) {
1108 mddev->major_version = 1;
1109 mddev->patch_version = 0;
1110 mddev->persistent = 1;
1111 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1112 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1113 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1114 mddev->level = le32_to_cpu(sb->level);
1115 mddev->clevel[0] = 0;
1116 mddev->layout = le32_to_cpu(sb->layout);
1117 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1118 mddev->size = le64_to_cpu(sb->size)/2;
1119 mddev->events = le64_to_cpu(sb->events);
1120 mddev->bitmap_offset = 0;
1121 mddev->default_bitmap_offset = 1024 >> 9;
1123 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1124 memcpy(mddev->uuid, sb->set_uuid, 16);
1126 mddev->max_disks = (4096-256)/2;
1128 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1129 mddev->bitmap_file == NULL ) {
1130 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1131 && mddev->level != 10) {
1132 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
1135 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1137 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1138 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1139 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1140 mddev->new_level = le32_to_cpu(sb->new_level);
1141 mddev->new_layout = le32_to_cpu(sb->new_layout);
1142 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1144 mddev->reshape_position = MaxSector;
1145 mddev->delta_disks = 0;
1146 mddev->new_level = mddev->level;
1147 mddev->new_layout = mddev->layout;
1148 mddev->new_chunk = mddev->chunk_size;
1151 } else if (mddev->pers == NULL) {
1152 /* Insist of good event counter while assembling */
1153 __u64 ev1 = le64_to_cpu(sb->events);
1155 if (ev1 < mddev->events)
1157 } else if (mddev->bitmap) {
1158 /* If adding to array with a bitmap, then we can accept an
1159 * older device, but not too old.
1161 __u64 ev1 = le64_to_cpu(sb->events);
1162 if (ev1 < mddev->bitmap->events_cleared)
1164 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1167 if (mddev->level != LEVEL_MULTIPATH) {
1169 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1170 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1172 case 0xffff: /* spare */
1174 case 0xfffe: /* faulty */
1175 set_bit(Faulty, &rdev->flags);
1178 if ((le32_to_cpu(sb->feature_map) &
1179 MD_FEATURE_RECOVERY_OFFSET))
1180 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1182 set_bit(In_sync, &rdev->flags);
1183 rdev->raid_disk = role;
1186 if (sb->devflags & WriteMostly1)
1187 set_bit(WriteMostly, &rdev->flags);
1188 } else /* MULTIPATH are always insync */
1189 set_bit(In_sync, &rdev->flags);
1194 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1196 struct mdp_superblock_1 *sb;
1197 struct list_head *tmp;
1200 /* make rdev->sb match mddev and rdev data. */
1202 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1204 sb->feature_map = 0;
1206 sb->recovery_offset = cpu_to_le64(0);
1207 memset(sb->pad1, 0, sizeof(sb->pad1));
1208 memset(sb->pad2, 0, sizeof(sb->pad2));
1209 memset(sb->pad3, 0, sizeof(sb->pad3));
1211 sb->utime = cpu_to_le64((__u64)mddev->utime);
1212 sb->events = cpu_to_le64(mddev->events);
1214 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1216 sb->resync_offset = cpu_to_le64(0);
1218 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1220 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1221 sb->size = cpu_to_le64(mddev->size<<1);
1223 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1224 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1225 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1228 if (rdev->raid_disk >= 0 &&
1229 !test_bit(In_sync, &rdev->flags) &&
1230 rdev->recovery_offset > 0) {
1231 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1232 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1235 if (mddev->reshape_position != MaxSector) {
1236 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1237 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1238 sb->new_layout = cpu_to_le32(mddev->new_layout);
1239 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1240 sb->new_level = cpu_to_le32(mddev->new_level);
1241 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1245 ITERATE_RDEV(mddev,rdev2,tmp)
1246 if (rdev2->desc_nr+1 > max_dev)
1247 max_dev = rdev2->desc_nr+1;
1249 sb->max_dev = cpu_to_le32(max_dev);
1250 for (i=0; i<max_dev;i++)
1251 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1253 ITERATE_RDEV(mddev,rdev2,tmp) {
1255 if (test_bit(Faulty, &rdev2->flags))
1256 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1257 else if (test_bit(In_sync, &rdev2->flags))
1258 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1259 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1260 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1262 sb->dev_roles[i] = cpu_to_le16(0xffff);
1265 sb->sb_csum = calc_sb_1_csum(sb);
1269 static struct super_type super_types[] = {
1272 .owner = THIS_MODULE,
1273 .load_super = super_90_load,
1274 .validate_super = super_90_validate,
1275 .sync_super = super_90_sync,
1279 .owner = THIS_MODULE,
1280 .load_super = super_1_load,
1281 .validate_super = super_1_validate,
1282 .sync_super = super_1_sync,
1286 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1288 struct list_head *tmp;
1291 ITERATE_RDEV(mddev,rdev,tmp)
1292 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1298 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1300 struct list_head *tmp;
1303 ITERATE_RDEV(mddev1,rdev,tmp)
1304 if (match_dev_unit(mddev2, rdev))
1310 static LIST_HEAD(pending_raid_disks);
1312 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1314 mdk_rdev_t *same_pdev;
1315 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1323 /* make sure rdev->size exceeds mddev->size */
1324 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1326 /* Cannot change size, so fail */
1329 mddev->size = rdev->size;
1331 same_pdev = match_dev_unit(mddev, rdev);
1334 "%s: WARNING: %s appears to be on the same physical"
1335 " disk as %s. True\n protection against single-disk"
1336 " failure might be compromised.\n",
1337 mdname(mddev), bdevname(rdev->bdev,b),
1338 bdevname(same_pdev->bdev,b2));
1340 /* Verify rdev->desc_nr is unique.
1341 * If it is -1, assign a free number, else
1342 * check number is not in use
1344 if (rdev->desc_nr < 0) {
1346 if (mddev->pers) choice = mddev->raid_disks;
1347 while (find_rdev_nr(mddev, choice))
1349 rdev->desc_nr = choice;
1351 if (find_rdev_nr(mddev, rdev->desc_nr))
1354 bdevname(rdev->bdev,b);
1355 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1357 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1360 list_add(&rdev->same_set, &mddev->disks);
1361 rdev->mddev = mddev;
1362 printk(KERN_INFO "md: bind<%s>\n", b);
1364 rdev->kobj.parent = &mddev->kobj;
1365 kobject_add(&rdev->kobj);
1367 if (rdev->bdev->bd_part)
1368 ko = &rdev->bdev->bd_part->kobj;
1370 ko = &rdev->bdev->bd_disk->kobj;
1371 sysfs_create_link(&rdev->kobj, ko, "block");
1372 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1376 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1378 char b[BDEVNAME_SIZE];
1383 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1384 list_del_init(&rdev->same_set);
1385 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1387 sysfs_remove_link(&rdev->kobj, "block");
1388 kobject_del(&rdev->kobj);
1392 * prevent the device from being mounted, repartitioned or
1393 * otherwise reused by a RAID array (or any other kernel
1394 * subsystem), by bd_claiming the device.
1396 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1399 struct block_device *bdev;
1400 char b[BDEVNAME_SIZE];
1402 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1404 printk(KERN_ERR "md: could not open %s.\n",
1405 __bdevname(dev, b));
1406 return PTR_ERR(bdev);
1408 err = bd_claim(bdev, rdev);
1410 printk(KERN_ERR "md: could not bd_claim %s.\n",
1419 static void unlock_rdev(mdk_rdev_t *rdev)
1421 struct block_device *bdev = rdev->bdev;
1429 void md_autodetect_dev(dev_t dev);
1431 static void export_rdev(mdk_rdev_t * rdev)
1433 char b[BDEVNAME_SIZE];
1434 printk(KERN_INFO "md: export_rdev(%s)\n",
1435 bdevname(rdev->bdev,b));
1439 list_del_init(&rdev->same_set);
1441 md_autodetect_dev(rdev->bdev->bd_dev);
1444 kobject_put(&rdev->kobj);
1447 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1449 unbind_rdev_from_array(rdev);
1453 static void export_array(mddev_t *mddev)
1455 struct list_head *tmp;
1458 ITERATE_RDEV(mddev,rdev,tmp) {
1463 kick_rdev_from_array(rdev);
1465 if (!list_empty(&mddev->disks))
1467 mddev->raid_disks = 0;
1468 mddev->major_version = 0;
1471 static void print_desc(mdp_disk_t *desc)
1473 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1474 desc->major,desc->minor,desc->raid_disk,desc->state);
1477 static void print_sb(mdp_super_t *sb)
1482 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1483 sb->major_version, sb->minor_version, sb->patch_version,
1484 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1486 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1487 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1488 sb->md_minor, sb->layout, sb->chunk_size);
1489 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1490 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1491 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1492 sb->failed_disks, sb->spare_disks,
1493 sb->sb_csum, (unsigned long)sb->events_lo);
1496 for (i = 0; i < MD_SB_DISKS; i++) {
1499 desc = sb->disks + i;
1500 if (desc->number || desc->major || desc->minor ||
1501 desc->raid_disk || (desc->state && (desc->state != 4))) {
1502 printk(" D %2d: ", i);
1506 printk(KERN_INFO "md: THIS: ");
1507 print_desc(&sb->this_disk);
1511 static void print_rdev(mdk_rdev_t *rdev)
1513 char b[BDEVNAME_SIZE];
1514 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1515 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1516 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1518 if (rdev->sb_loaded) {
1519 printk(KERN_INFO "md: rdev superblock:\n");
1520 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1522 printk(KERN_INFO "md: no rdev superblock!\n");
1525 void md_print_devices(void)
1527 struct list_head *tmp, *tmp2;
1530 char b[BDEVNAME_SIZE];
1533 printk("md: **********************************\n");
1534 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1535 printk("md: **********************************\n");
1536 ITERATE_MDDEV(mddev,tmp) {
1539 bitmap_print_sb(mddev->bitmap);
1541 printk("%s: ", mdname(mddev));
1542 ITERATE_RDEV(mddev,rdev,tmp2)
1543 printk("<%s>", bdevname(rdev->bdev,b));
1546 ITERATE_RDEV(mddev,rdev,tmp2)
1549 printk("md: **********************************\n");
1554 static void sync_sbs(mddev_t * mddev)
1557 struct list_head *tmp;
1559 ITERATE_RDEV(mddev,rdev,tmp) {
1560 super_types[mddev->major_version].
1561 sync_super(mddev, rdev);
1562 rdev->sb_loaded = 1;
1566 void md_update_sb(mddev_t * mddev)
1569 struct list_head *tmp;
1574 spin_lock_irq(&mddev->write_lock);
1575 sync_req = mddev->in_sync;
1576 mddev->utime = get_seconds();
1579 if (!mddev->events) {
1581 * oops, this 64-bit counter should never wrap.
1582 * Either we are in around ~1 trillion A.C., assuming
1583 * 1 reboot per second, or we have a bug:
1588 mddev->sb_dirty = 2;
1592 * do not write anything to disk if using
1593 * nonpersistent superblocks
1595 if (!mddev->persistent) {
1596 mddev->sb_dirty = 0;
1597 spin_unlock_irq(&mddev->write_lock);
1598 wake_up(&mddev->sb_wait);
1601 spin_unlock_irq(&mddev->write_lock);
1604 "md: updating %s RAID superblock on device (in sync %d)\n",
1605 mdname(mddev),mddev->in_sync);
1607 err = bitmap_update_sb(mddev->bitmap);
1608 ITERATE_RDEV(mddev,rdev,tmp) {
1609 char b[BDEVNAME_SIZE];
1610 dprintk(KERN_INFO "md: ");
1611 if (test_bit(Faulty, &rdev->flags))
1612 dprintk("(skipping faulty ");
1614 dprintk("%s ", bdevname(rdev->bdev,b));
1615 if (!test_bit(Faulty, &rdev->flags)) {
1616 md_super_write(mddev,rdev,
1617 rdev->sb_offset<<1, rdev->sb_size,
1619 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1620 bdevname(rdev->bdev,b),
1621 (unsigned long long)rdev->sb_offset);
1625 if (mddev->level == LEVEL_MULTIPATH)
1626 /* only need to write one superblock... */
1629 md_super_wait(mddev);
1630 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1632 spin_lock_irq(&mddev->write_lock);
1633 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1634 /* have to write it out again */
1635 spin_unlock_irq(&mddev->write_lock);
1638 mddev->sb_dirty = 0;
1639 spin_unlock_irq(&mddev->write_lock);
1640 wake_up(&mddev->sb_wait);
1643 EXPORT_SYMBOL_GPL(md_update_sb);
1645 /* words written to sysfs files may, or my not, be \n terminated.
1646 * We want to accept with case. For this we use cmd_match.
1648 static int cmd_match(const char *cmd, const char *str)
1650 /* See if cmd, written into a sysfs file, matches
1651 * str. They must either be the same, or cmd can
1652 * have a trailing newline
1654 while (*cmd && *str && *cmd == *str) {
1665 struct rdev_sysfs_entry {
1666 struct attribute attr;
1667 ssize_t (*show)(mdk_rdev_t *, char *);
1668 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1672 state_show(mdk_rdev_t *rdev, char *page)
1677 if (test_bit(Faulty, &rdev->flags)) {
1678 len+= sprintf(page+len, "%sfaulty",sep);
1681 if (test_bit(In_sync, &rdev->flags)) {
1682 len += sprintf(page+len, "%sin_sync",sep);
1685 if (!test_bit(Faulty, &rdev->flags) &&
1686 !test_bit(In_sync, &rdev->flags)) {
1687 len += sprintf(page+len, "%sspare", sep);
1690 return len+sprintf(page+len, "\n");
1693 static struct rdev_sysfs_entry
1694 rdev_state = __ATTR_RO(state);
1697 super_show(mdk_rdev_t *rdev, char *page)
1699 if (rdev->sb_loaded && rdev->sb_size) {
1700 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1701 return rdev->sb_size;
1705 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1708 errors_show(mdk_rdev_t *rdev, char *page)
1710 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1714 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1717 unsigned long n = simple_strtoul(buf, &e, 10);
1718 if (*buf && (*e == 0 || *e == '\n')) {
1719 atomic_set(&rdev->corrected_errors, n);
1724 static struct rdev_sysfs_entry rdev_errors =
1725 __ATTR(errors, 0644, errors_show, errors_store);
1728 slot_show(mdk_rdev_t *rdev, char *page)
1730 if (rdev->raid_disk < 0)
1731 return sprintf(page, "none\n");
1733 return sprintf(page, "%d\n", rdev->raid_disk);
1737 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1740 int slot = simple_strtoul(buf, &e, 10);
1741 if (strncmp(buf, "none", 4)==0)
1743 else if (e==buf || (*e && *e!= '\n'))
1745 if (rdev->mddev->pers)
1746 /* Cannot set slot in active array (yet) */
1748 if (slot >= rdev->mddev->raid_disks)
1750 rdev->raid_disk = slot;
1751 /* assume it is working */
1753 set_bit(In_sync, &rdev->flags);
1758 static struct rdev_sysfs_entry rdev_slot =
1759 __ATTR(slot, 0644, slot_show, slot_store);
1762 offset_show(mdk_rdev_t *rdev, char *page)
1764 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1768 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1771 unsigned long long offset = simple_strtoull(buf, &e, 10);
1772 if (e==buf || (*e && *e != '\n'))
1774 if (rdev->mddev->pers)
1776 rdev->data_offset = offset;
1780 static struct rdev_sysfs_entry rdev_offset =
1781 __ATTR(offset, 0644, offset_show, offset_store);
1784 rdev_size_show(mdk_rdev_t *rdev, char *page)
1786 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1790 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1793 unsigned long long size = simple_strtoull(buf, &e, 10);
1794 if (e==buf || (*e && *e != '\n'))
1796 if (rdev->mddev->pers)
1799 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1800 rdev->mddev->size = size;
1804 static struct rdev_sysfs_entry rdev_size =
1805 __ATTR(size, 0644, rdev_size_show, rdev_size_store);
1807 static struct attribute *rdev_default_attrs[] = {
1817 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1819 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1820 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1824 return entry->show(rdev, page);
1828 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1829 const char *page, size_t length)
1831 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1832 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1836 return entry->store(rdev, page, length);
1839 static void rdev_free(struct kobject *ko)
1841 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1844 static struct sysfs_ops rdev_sysfs_ops = {
1845 .show = rdev_attr_show,
1846 .store = rdev_attr_store,
1848 static struct kobj_type rdev_ktype = {
1849 .release = rdev_free,
1850 .sysfs_ops = &rdev_sysfs_ops,
1851 .default_attrs = rdev_default_attrs,
1855 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1857 * mark the device faulty if:
1859 * - the device is nonexistent (zero size)
1860 * - the device has no valid superblock
1862 * a faulty rdev _never_ has rdev->sb set.
1864 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1866 char b[BDEVNAME_SIZE];
1871 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1873 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1874 return ERR_PTR(-ENOMEM);
1877 if ((err = alloc_disk_sb(rdev)))
1880 err = lock_rdev(rdev, newdev);
1884 rdev->kobj.parent = NULL;
1885 rdev->kobj.ktype = &rdev_ktype;
1886 kobject_init(&rdev->kobj);
1890 rdev->data_offset = 0;
1891 atomic_set(&rdev->nr_pending, 0);
1892 atomic_set(&rdev->read_errors, 0);
1893 atomic_set(&rdev->corrected_errors, 0);
1895 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1898 "md: %s has zero or unknown size, marking faulty!\n",
1899 bdevname(rdev->bdev,b));
1904 if (super_format >= 0) {
1905 err = super_types[super_format].
1906 load_super(rdev, NULL, super_minor);
1907 if (err == -EINVAL) {
1909 "md: %s has invalid sb, not importing!\n",
1910 bdevname(rdev->bdev,b));
1915 "md: could not read %s's sb, not importing!\n",
1916 bdevname(rdev->bdev,b));
1920 INIT_LIST_HEAD(&rdev->same_set);
1925 if (rdev->sb_page) {
1931 return ERR_PTR(err);
1935 * Check a full RAID array for plausibility
1939 static void analyze_sbs(mddev_t * mddev)
1942 struct list_head *tmp;
1943 mdk_rdev_t *rdev, *freshest;
1944 char b[BDEVNAME_SIZE];
1947 ITERATE_RDEV(mddev,rdev,tmp)
1948 switch (super_types[mddev->major_version].
1949 load_super(rdev, freshest, mddev->minor_version)) {
1957 "md: fatal superblock inconsistency in %s"
1958 " -- removing from array\n",
1959 bdevname(rdev->bdev,b));
1960 kick_rdev_from_array(rdev);
1964 super_types[mddev->major_version].
1965 validate_super(mddev, freshest);
1968 ITERATE_RDEV(mddev,rdev,tmp) {
1969 if (rdev != freshest)
1970 if (super_types[mddev->major_version].
1971 validate_super(mddev, rdev)) {
1972 printk(KERN_WARNING "md: kicking non-fresh %s"
1974 bdevname(rdev->bdev,b));
1975 kick_rdev_from_array(rdev);
1978 if (mddev->level == LEVEL_MULTIPATH) {
1979 rdev->desc_nr = i++;
1980 rdev->raid_disk = rdev->desc_nr;
1981 set_bit(In_sync, &rdev->flags);
1987 if (mddev->recovery_cp != MaxSector &&
1989 printk(KERN_ERR "md: %s: raid array is not clean"
1990 " -- starting background reconstruction\n",
1996 safe_delay_show(mddev_t *mddev, char *page)
1998 int msec = (mddev->safemode_delay*1000)/HZ;
1999 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2002 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2010 /* remove a period, and count digits after it */
2011 if (len >= sizeof(buf))
2013 strlcpy(buf, cbuf, len);
2015 for (i=0; i<len; i++) {
2017 if (isdigit(buf[i])) {
2022 } else if (buf[i] == '.') {
2027 msec = simple_strtoul(buf, &e, 10);
2028 if (e == buf || (*e && *e != '\n'))
2030 msec = (msec * 1000) / scale;
2032 mddev->safemode_delay = 0;
2034 mddev->safemode_delay = (msec*HZ)/1000;
2035 if (mddev->safemode_delay == 0)
2036 mddev->safemode_delay = 1;
2040 static struct md_sysfs_entry md_safe_delay =
2041 __ATTR(safe_mode_delay, 0644,safe_delay_show, safe_delay_store);
2044 level_show(mddev_t *mddev, char *page)
2046 struct mdk_personality *p = mddev->pers;
2048 return sprintf(page, "%s\n", p->name);
2049 else if (mddev->clevel[0])
2050 return sprintf(page, "%s\n", mddev->clevel);
2051 else if (mddev->level != LEVEL_NONE)
2052 return sprintf(page, "%d\n", mddev->level);
2058 level_store(mddev_t *mddev, const char *buf, size_t len)
2065 if (len >= sizeof(mddev->clevel))
2067 strncpy(mddev->clevel, buf, len);
2068 if (mddev->clevel[len-1] == '\n')
2070 mddev->clevel[len] = 0;
2071 mddev->level = LEVEL_NONE;
2075 static struct md_sysfs_entry md_level =
2076 __ATTR(level, 0644, level_show, level_store);
2079 raid_disks_show(mddev_t *mddev, char *page)
2081 if (mddev->raid_disks == 0)
2083 return sprintf(page, "%d\n", mddev->raid_disks);
2086 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2089 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2091 /* can only set raid_disks if array is not yet active */
2094 unsigned long n = simple_strtoul(buf, &e, 10);
2096 if (!*buf || (*e && *e != '\n'))
2100 rv = update_raid_disks(mddev, n);
2102 mddev->raid_disks = n;
2103 return rv ? rv : len;
2105 static struct md_sysfs_entry md_raid_disks =
2106 __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
2109 chunk_size_show(mddev_t *mddev, char *page)
2111 return sprintf(page, "%d\n", mddev->chunk_size);
2115 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2117 /* can only set chunk_size if array is not yet active */
2119 unsigned long n = simple_strtoul(buf, &e, 10);
2123 if (!*buf || (*e && *e != '\n'))
2126 mddev->chunk_size = n;
2129 static struct md_sysfs_entry md_chunk_size =
2130 __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2133 null_show(mddev_t *mddev, char *page)
2139 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2141 /* buf must be %d:%d\n? giving major and minor numbers */
2142 /* The new device is added to the array.
2143 * If the array has a persistent superblock, we read the
2144 * superblock to initialise info and check validity.
2145 * Otherwise, only checking done is that in bind_rdev_to_array,
2146 * which mainly checks size.
2149 int major = simple_strtoul(buf, &e, 10);
2155 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2157 minor = simple_strtoul(e+1, &e, 10);
2158 if (*e && *e != '\n')
2160 dev = MKDEV(major, minor);
2161 if (major != MAJOR(dev) ||
2162 minor != MINOR(dev))
2166 if (mddev->persistent) {
2167 rdev = md_import_device(dev, mddev->major_version,
2168 mddev->minor_version);
2169 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2170 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2171 mdk_rdev_t, same_set);
2172 err = super_types[mddev->major_version]
2173 .load_super(rdev, rdev0, mddev->minor_version);
2178 rdev = md_import_device(dev, -1, -1);
2181 return PTR_ERR(rdev);
2182 err = bind_rdev_to_array(rdev, mddev);
2186 return err ? err : len;
2189 static struct md_sysfs_entry md_new_device =
2190 __ATTR(new_dev, 0200, null_show, new_dev_store);
2193 size_show(mddev_t *mddev, char *page)
2195 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2198 static int update_size(mddev_t *mddev, unsigned long size);
2201 size_store(mddev_t *mddev, const char *buf, size_t len)
2203 /* If array is inactive, we can reduce the component size, but
2204 * not increase it (except from 0).
2205 * If array is active, we can try an on-line resize
2209 unsigned long long size = simple_strtoull(buf, &e, 10);
2210 if (!*buf || *buf == '\n' ||
2215 err = update_size(mddev, size);
2216 md_update_sb(mddev);
2218 if (mddev->size == 0 ||
2224 return err ? err : len;
2227 static struct md_sysfs_entry md_size =
2228 __ATTR(component_size, 0644, size_show, size_store);
2232 * This is either 'none' for arrays with externally managed metadata,
2233 * or N.M for internally known formats
2236 metadata_show(mddev_t *mddev, char *page)
2238 if (mddev->persistent)
2239 return sprintf(page, "%d.%d\n",
2240 mddev->major_version, mddev->minor_version);
2242 return sprintf(page, "none\n");
2246 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2250 if (!list_empty(&mddev->disks))
2253 if (cmd_match(buf, "none")) {
2254 mddev->persistent = 0;
2255 mddev->major_version = 0;
2256 mddev->minor_version = 90;
2259 major = simple_strtoul(buf, &e, 10);
2260 if (e==buf || *e != '.')
2263 minor = simple_strtoul(buf, &e, 10);
2264 if (e==buf || *e != '\n')
2266 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2267 super_types[major].name == NULL)
2269 mddev->major_version = major;
2270 mddev->minor_version = minor;
2271 mddev->persistent = 1;
2275 static struct md_sysfs_entry md_metadata =
2276 __ATTR(metadata_version, 0644, metadata_show, metadata_store);
2279 action_show(mddev_t *mddev, char *page)
2281 char *type = "idle";
2282 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2283 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2284 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2286 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2287 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2289 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2296 return sprintf(page, "%s\n", type);
2300 action_store(mddev_t *mddev, const char *page, size_t len)
2302 if (!mddev->pers || !mddev->pers->sync_request)
2305 if (cmd_match(page, "idle")) {
2306 if (mddev->sync_thread) {
2307 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2308 md_unregister_thread(mddev->sync_thread);
2309 mddev->sync_thread = NULL;
2310 mddev->recovery = 0;
2312 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2313 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2315 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2316 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2317 else if (cmd_match(page, "reshape")) {
2319 if (mddev->pers->start_reshape == NULL)
2321 err = mddev->pers->start_reshape(mddev);
2325 if (cmd_match(page, "check"))
2326 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2327 else if (!cmd_match(page, "repair"))
2329 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2330 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2332 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2333 md_wakeup_thread(mddev->thread);
2338 mismatch_cnt_show(mddev_t *mddev, char *page)
2340 return sprintf(page, "%llu\n",
2341 (unsigned long long) mddev->resync_mismatches);
2344 static struct md_sysfs_entry
2345 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2348 static struct md_sysfs_entry
2349 md_mismatches = __ATTR_RO(mismatch_cnt);
2352 sync_min_show(mddev_t *mddev, char *page)
2354 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2355 mddev->sync_speed_min ? "local": "system");
2359 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2363 if (strncmp(buf, "system", 6)==0) {
2364 mddev->sync_speed_min = 0;
2367 min = simple_strtoul(buf, &e, 10);
2368 if (buf == e || (*e && *e != '\n') || min <= 0)
2370 mddev->sync_speed_min = min;
2374 static struct md_sysfs_entry md_sync_min =
2375 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2378 sync_max_show(mddev_t *mddev, char *page)
2380 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2381 mddev->sync_speed_max ? "local": "system");
2385 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2389 if (strncmp(buf, "system", 6)==0) {
2390 mddev->sync_speed_max = 0;
2393 max = simple_strtoul(buf, &e, 10);
2394 if (buf == e || (*e && *e != '\n') || max <= 0)
2396 mddev->sync_speed_max = max;
2400 static struct md_sysfs_entry md_sync_max =
2401 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2405 sync_speed_show(mddev_t *mddev, char *page)
2407 unsigned long resync, dt, db;
2408 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2409 dt = ((jiffies - mddev->resync_mark) / HZ);
2411 db = resync - (mddev->resync_mark_cnt);
2412 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2415 static struct md_sysfs_entry
2416 md_sync_speed = __ATTR_RO(sync_speed);
2419 sync_completed_show(mddev_t *mddev, char *page)
2421 unsigned long max_blocks, resync;
2423 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2424 max_blocks = mddev->resync_max_sectors;
2426 max_blocks = mddev->size << 1;
2428 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2429 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2432 static struct md_sysfs_entry
2433 md_sync_completed = __ATTR_RO(sync_completed);
2436 suspend_lo_show(mddev_t *mddev, char *page)
2438 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2442 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2445 unsigned long long new = simple_strtoull(buf, &e, 10);
2447 if (mddev->pers->quiesce == NULL)
2449 if (buf == e || (*e && *e != '\n'))
2451 if (new >= mddev->suspend_hi ||
2452 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2453 mddev->suspend_lo = new;
2454 mddev->pers->quiesce(mddev, 2);
2459 static struct md_sysfs_entry md_suspend_lo =
2460 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2464 suspend_hi_show(mddev_t *mddev, char *page)
2466 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2470 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2473 unsigned long long new = simple_strtoull(buf, &e, 10);
2475 if (mddev->pers->quiesce == NULL)
2477 if (buf == e || (*e && *e != '\n'))
2479 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2480 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2481 mddev->suspend_hi = new;
2482 mddev->pers->quiesce(mddev, 1);
2483 mddev->pers->quiesce(mddev, 0);
2488 static struct md_sysfs_entry md_suspend_hi =
2489 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2492 static struct attribute *md_default_attrs[] = {
2494 &md_raid_disks.attr,
2495 &md_chunk_size.attr,
2498 &md_new_device.attr,
2499 &md_safe_delay.attr,
2503 static struct attribute *md_redundancy_attrs[] = {
2505 &md_mismatches.attr,
2508 &md_sync_speed.attr,
2509 &md_sync_completed.attr,
2510 &md_suspend_lo.attr,
2511 &md_suspend_hi.attr,
2514 static struct attribute_group md_redundancy_group = {
2516 .attrs = md_redundancy_attrs,
2521 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2523 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2524 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2529 rv = mddev_lock(mddev);
2531 rv = entry->show(mddev, page);
2532 mddev_unlock(mddev);
2538 md_attr_store(struct kobject *kobj, struct attribute *attr,
2539 const char *page, size_t length)
2541 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2542 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2547 rv = mddev_lock(mddev);
2549 rv = entry->store(mddev, page, length);
2550 mddev_unlock(mddev);
2555 static void md_free(struct kobject *ko)
2557 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2561 static struct sysfs_ops md_sysfs_ops = {
2562 .show = md_attr_show,
2563 .store = md_attr_store,
2565 static struct kobj_type md_ktype = {
2567 .sysfs_ops = &md_sysfs_ops,
2568 .default_attrs = md_default_attrs,
2573 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2575 static DEFINE_MUTEX(disks_mutex);
2576 mddev_t *mddev = mddev_find(dev);
2577 struct gendisk *disk;
2578 int partitioned = (MAJOR(dev) != MD_MAJOR);
2579 int shift = partitioned ? MdpMinorShift : 0;
2580 int unit = MINOR(dev) >> shift;
2585 mutex_lock(&disks_mutex);
2586 if (mddev->gendisk) {
2587 mutex_unlock(&disks_mutex);
2591 disk = alloc_disk(1 << shift);
2593 mutex_unlock(&disks_mutex);
2597 disk->major = MAJOR(dev);
2598 disk->first_minor = unit << shift;
2600 sprintf(disk->disk_name, "md_d%d", unit);
2601 sprintf(disk->devfs_name, "md/d%d", unit);
2603 sprintf(disk->disk_name, "md%d", unit);
2604 sprintf(disk->devfs_name, "md/%d", unit);
2606 disk->fops = &md_fops;
2607 disk->private_data = mddev;
2608 disk->queue = mddev->queue;
2610 mddev->gendisk = disk;
2611 mutex_unlock(&disks_mutex);
2612 mddev->kobj.parent = &disk->kobj;
2613 mddev->kobj.k_name = NULL;
2614 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2615 mddev->kobj.ktype = &md_ktype;
2616 kobject_register(&mddev->kobj);
2620 static void md_safemode_timeout(unsigned long data)
2622 mddev_t *mddev = (mddev_t *) data;
2624 mddev->safemode = 1;
2625 md_wakeup_thread(mddev->thread);
2628 static int start_dirty_degraded;
2630 static int do_md_run(mddev_t * mddev)
2634 struct list_head *tmp;
2636 struct gendisk *disk;
2637 struct mdk_personality *pers;
2638 char b[BDEVNAME_SIZE];
2640 if (list_empty(&mddev->disks))
2641 /* cannot run an array with no devices.. */
2648 * Analyze all RAID superblock(s)
2650 if (!mddev->raid_disks)
2653 chunk_size = mddev->chunk_size;
2656 if (chunk_size > MAX_CHUNK_SIZE) {
2657 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2658 chunk_size, MAX_CHUNK_SIZE);
2662 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2664 if ( (1 << ffz(~chunk_size)) != chunk_size) {
2665 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
2668 if (chunk_size < PAGE_SIZE) {
2669 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2670 chunk_size, PAGE_SIZE);
2674 /* devices must have minimum size of one chunk */
2675 ITERATE_RDEV(mddev,rdev,tmp) {
2676 if (test_bit(Faulty, &rdev->flags))
2678 if (rdev->size < chunk_size / 1024) {
2680 "md: Dev %s smaller than chunk_size:"
2682 bdevname(rdev->bdev,b),
2683 (unsigned long long)rdev->size,
2691 if (mddev->level != LEVEL_NONE)
2692 request_module("md-level-%d", mddev->level);
2693 else if (mddev->clevel[0])
2694 request_module("md-%s", mddev->clevel);
2698 * Drop all container device buffers, from now on
2699 * the only valid external interface is through the md
2701 * Also find largest hardsector size
2703 ITERATE_RDEV(mddev,rdev,tmp) {
2704 if (test_bit(Faulty, &rdev->flags))
2706 sync_blockdev(rdev->bdev);
2707 invalidate_bdev(rdev->bdev, 0);
2710 md_probe(mddev->unit, NULL, NULL);
2711 disk = mddev->gendisk;
2715 spin_lock(&pers_lock);
2716 pers = find_pers(mddev->level, mddev->clevel);
2717 if (!pers || !try_module_get(pers->owner)) {
2718 spin_unlock(&pers_lock);
2719 if (mddev->level != LEVEL_NONE)
2720 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2723 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2728 spin_unlock(&pers_lock);
2729 mddev->level = pers->level;
2730 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2732 if (mddev->reshape_position != MaxSector &&
2733 pers->start_reshape == NULL) {
2734 /* This personality cannot handle reshaping... */
2736 module_put(pers->owner);
2740 mddev->recovery = 0;
2741 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2742 mddev->barriers_work = 1;
2743 mddev->ok_start_degraded = start_dirty_degraded;
2746 mddev->ro = 2; /* read-only, but switch on first write */
2748 err = mddev->pers->run(mddev);
2749 if (!err && mddev->pers->sync_request) {
2750 err = bitmap_create(mddev);
2752 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2753 mdname(mddev), err);
2754 mddev->pers->stop(mddev);
2758 printk(KERN_ERR "md: pers->run() failed ...\n");
2759 module_put(mddev->pers->owner);
2761 bitmap_destroy(mddev);
2764 if (mddev->pers->sync_request)
2765 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2766 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2769 atomic_set(&mddev->writes_pending,0);
2770 mddev->safemode = 0;
2771 mddev->safemode_timer.function = md_safemode_timeout;
2772 mddev->safemode_timer.data = (unsigned long) mddev;
2773 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
2776 ITERATE_RDEV(mddev,rdev,tmp)
2777 if (rdev->raid_disk >= 0) {
2779 sprintf(nm, "rd%d", rdev->raid_disk);
2780 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2783 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2784 md_wakeup_thread(mddev->thread);
2786 if (mddev->sb_dirty)
2787 md_update_sb(mddev);
2789 set_capacity(disk, mddev->array_size<<1);
2791 /* If we call blk_queue_make_request here, it will
2792 * re-initialise max_sectors etc which may have been
2793 * refined inside -> run. So just set the bits we need to set.
2794 * Most initialisation happended when we called
2795 * blk_queue_make_request(..., md_fail_request)
2798 mddev->queue->queuedata = mddev;
2799 mddev->queue->make_request_fn = mddev->pers->make_request;
2801 /* If there is a partially-recovered drive we need to
2802 * start recovery here. If we leave it to md_check_recovery,
2803 * it will remove the drives and not do the right thing
2805 if (mddev->degraded) {
2806 struct list_head *rtmp;
2808 ITERATE_RDEV(mddev,rdev,rtmp)
2809 if (rdev->raid_disk >= 0 &&
2810 !test_bit(In_sync, &rdev->flags) &&
2811 !test_bit(Faulty, &rdev->flags))
2812 /* complete an interrupted recovery */
2814 if (spares && mddev->pers->sync_request) {
2815 mddev->recovery = 0;
2816 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
2817 mddev->sync_thread = md_register_thread(md_do_sync,
2820 if (!mddev->sync_thread) {
2821 printk(KERN_ERR "%s: could not start resync"
2824 /* leave the spares where they are, it shouldn't hurt */
2825 mddev->recovery = 0;
2827 md_wakeup_thread(mddev->sync_thread);
2832 md_new_event(mddev);
2836 static int restart_array(mddev_t *mddev)
2838 struct gendisk *disk = mddev->gendisk;
2842 * Complain if it has no devices
2845 if (list_empty(&mddev->disks))
2853 mddev->safemode = 0;
2855 set_disk_ro(disk, 0);
2857 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2860 * Kick recovery or resync if necessary
2862 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2863 md_wakeup_thread(mddev->thread);
2864 md_wakeup_thread(mddev->sync_thread);
2867 printk(KERN_ERR "md: %s has no personality assigned.\n",
2876 static int do_md_stop(mddev_t * mddev, int ro)
2879 struct gendisk *disk = mddev->gendisk;
2882 if (atomic_read(&mddev->active)>2) {
2883 printk("md: %s still in use.\n",mdname(mddev));
2887 if (mddev->sync_thread) {
2888 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
2889 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2890 md_unregister_thread(mddev->sync_thread);
2891 mddev->sync_thread = NULL;
2894 del_timer_sync(&mddev->safemode_timer);
2896 invalidate_partition(disk, 0);
2904 bitmap_flush(mddev);
2905 md_super_wait(mddev);
2907 set_disk_ro(disk, 0);
2908 blk_queue_make_request(mddev->queue, md_fail_request);
2909 mddev->pers->stop(mddev);
2910 if (mddev->pers->sync_request)
2911 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2913 module_put(mddev->pers->owner);
2918 if (!mddev->in_sync || mddev->sb_dirty) {
2919 /* mark array as shutdown cleanly */
2921 md_update_sb(mddev);
2924 set_disk_ro(disk, 1);
2925 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
2929 * Free resources if final stop
2933 struct list_head *tmp;
2934 struct gendisk *disk;
2935 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2937 bitmap_destroy(mddev);
2938 if (mddev->bitmap_file) {
2939 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2940 fput(mddev->bitmap_file);
2941 mddev->bitmap_file = NULL;
2943 mddev->bitmap_offset = 0;
2945 ITERATE_RDEV(mddev,rdev,tmp)
2946 if (rdev->raid_disk >= 0) {
2948 sprintf(nm, "rd%d", rdev->raid_disk);
2949 sysfs_remove_link(&mddev->kobj, nm);
2952 export_array(mddev);
2954 mddev->array_size = 0;
2955 disk = mddev->gendisk;
2957 set_capacity(disk, 0);
2959 } else if (mddev->pers)
2960 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2963 md_new_event(mddev);
2968 static void autorun_array(mddev_t *mddev)
2971 struct list_head *tmp;
2974 if (list_empty(&mddev->disks))
2977 printk(KERN_INFO "md: running: ");
2979 ITERATE_RDEV(mddev,rdev,tmp) {
2980 char b[BDEVNAME_SIZE];
2981 printk("<%s>", bdevname(rdev->bdev,b));
2985 err = do_md_run (mddev);
2987 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2988 do_md_stop (mddev, 0);
2993 * lets try to run arrays based on all disks that have arrived
2994 * until now. (those are in pending_raid_disks)
2996 * the method: pick the first pending disk, collect all disks with
2997 * the same UUID, remove all from the pending list and put them into
2998 * the 'same_array' list. Then order this list based on superblock
2999 * update time (freshest comes first), kick out 'old' disks and
3000 * compare superblocks. If everything's fine then run it.
3002 * If "unit" is allocated, then bump its reference count
3004 static void autorun_devices(int part)
3006 struct list_head *tmp;
3007 mdk_rdev_t *rdev0, *rdev;
3009 char b[BDEVNAME_SIZE];
3011 printk(KERN_INFO "md: autorun ...\n");
3012 while (!list_empty(&pending_raid_disks)) {
3014 LIST_HEAD(candidates);
3015 rdev0 = list_entry(pending_raid_disks.next,
3016 mdk_rdev_t, same_set);
3018 printk(KERN_INFO "md: considering %s ...\n",
3019 bdevname(rdev0->bdev,b));
3020 INIT_LIST_HEAD(&candidates);
3021 ITERATE_RDEV_PENDING(rdev,tmp)
3022 if (super_90_load(rdev, rdev0, 0) >= 0) {
3023 printk(KERN_INFO "md: adding %s ...\n",
3024 bdevname(rdev->bdev,b));
3025 list_move(&rdev->same_set, &candidates);
3028 * now we have a set of devices, with all of them having
3029 * mostly sane superblocks. It's time to allocate the
3032 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
3033 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3034 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3038 dev = MKDEV(mdp_major,
3039 rdev0->preferred_minor << MdpMinorShift);
3041 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3043 md_probe(dev, NULL, NULL);
3044 mddev = mddev_find(dev);
3047 "md: cannot allocate memory for md drive.\n");
3050 if (mddev_lock(mddev))
3051 printk(KERN_WARNING "md: %s locked, cannot run\n",
3053 else if (mddev->raid_disks || mddev->major_version
3054 || !list_empty(&mddev->disks)) {
3056 "md: %s already running, cannot run %s\n",
3057 mdname(mddev), bdevname(rdev0->bdev,b));
3058 mddev_unlock(mddev);
3060 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3061 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3062 list_del_init(&rdev->same_set);
3063 if (bind_rdev_to_array(rdev, mddev))
3066 autorun_array(mddev);
3067 mddev_unlock(mddev);
3069 /* on success, candidates will be empty, on error
3072 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3076 printk(KERN_INFO "md: ... autorun DONE.\n");
3080 * import RAID devices based on one partition
3081 * if possible, the array gets run as well.
3084 static int autostart_array(dev_t startdev)
3086 char b[BDEVNAME_SIZE];
3087 int err = -EINVAL, i;
3088 mdp_super_t *sb = NULL;
3089 mdk_rdev_t *start_rdev = NULL, *rdev;
3091 start_rdev = md_import_device(startdev, 0, 0);
3092 if (IS_ERR(start_rdev))
3096 /* NOTE: this can only work for 0.90.0 superblocks */
3097 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
3098 if (sb->major_version != 0 ||
3099 sb->minor_version != 90 ) {
3100 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
3101 export_rdev(start_rdev);
3105 if (test_bit(Faulty, &start_rdev->flags)) {
3107 "md: can not autostart based on faulty %s!\n",
3108 bdevname(start_rdev->bdev,b));
3109 export_rdev(start_rdev);
3112 list_add(&start_rdev->same_set, &pending_raid_disks);
3114 for (i = 0; i < MD_SB_DISKS; i++) {
3115 mdp_disk_t *desc = sb->disks + i;
3116 dev_t dev = MKDEV(desc->major, desc->minor);
3120 if (dev == startdev)
3122 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
3124 rdev = md_import_device(dev, 0, 0);
3128 list_add(&rdev->same_set, &pending_raid_disks);
3132 * possibly return codes
3140 static int get_version(void __user * arg)
3144 ver.major = MD_MAJOR_VERSION;
3145 ver.minor = MD_MINOR_VERSION;
3146 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3148 if (copy_to_user(arg, &ver, sizeof(ver)))
3154 static int get_array_info(mddev_t * mddev, void __user * arg)
3156 mdu_array_info_t info;
3157 int nr,working,active,failed,spare;
3159 struct list_head *tmp;
3161 nr=working=active=failed=spare=0;
3162 ITERATE_RDEV(mddev,rdev,tmp) {
3164 if (test_bit(Faulty, &rdev->flags))
3168 if (test_bit(In_sync, &rdev->flags))
3175 info.major_version = mddev->major_version;
3176 info.minor_version = mddev->minor_version;
3177 info.patch_version = MD_PATCHLEVEL_VERSION;
3178 info.ctime = mddev->ctime;
3179 info.level = mddev->level;
3180 info.size = mddev->size;
3181 if (info.size != mddev->size) /* overflow */
3184 info.raid_disks = mddev->raid_disks;
3185 info.md_minor = mddev->md_minor;
3186 info.not_persistent= !mddev->persistent;
3188 info.utime = mddev->utime;
3191 info.state = (1<<MD_SB_CLEAN);
3192 if (mddev->bitmap && mddev->bitmap_offset)
3193 info.state = (1<<MD_SB_BITMAP_PRESENT);
3194 info.active_disks = active;
3195 info.working_disks = working;
3196 info.failed_disks = failed;
3197 info.spare_disks = spare;
3199 info.layout = mddev->layout;
3200 info.chunk_size = mddev->chunk_size;
3202 if (copy_to_user(arg, &info, sizeof(info)))
3208 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
3210 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3211 char *ptr, *buf = NULL;
3214 file = kmalloc(sizeof(*file), GFP_KERNEL);
3218 /* bitmap disabled, zero the first byte and copy out */
3219 if (!mddev->bitmap || !mddev->bitmap->file) {
3220 file->pathname[0] = '\0';
3224 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3228 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3232 strcpy(file->pathname, ptr);
3236 if (copy_to_user(arg, file, sizeof(*file)))
3244 static int get_disk_info(mddev_t * mddev, void __user * arg)
3246 mdu_disk_info_t info;
3250 if (copy_from_user(&info, arg, sizeof(info)))
3255 rdev = find_rdev_nr(mddev, nr);
3257 info.major = MAJOR(rdev->bdev->bd_dev);
3258 info.minor = MINOR(rdev->bdev->bd_dev);
3259 info.raid_disk = rdev->raid_disk;
3261 if (test_bit(Faulty, &rdev->flags))
3262 info.state |= (1<<MD_DISK_FAULTY);
3263 else if (test_bit(In_sync, &rdev->flags)) {
3264 info.state |= (1<<MD_DISK_ACTIVE);
3265 info.state |= (1<<MD_DISK_SYNC);
3267 if (test_bit(WriteMostly, &rdev->flags))
3268 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3270 info.major = info.minor = 0;
3271 info.raid_disk = -1;
3272 info.state = (1<<MD_DISK_REMOVED);
3275 if (copy_to_user(arg, &info, sizeof(info)))
3281 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3283 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3285 dev_t dev = MKDEV(info->major,info->minor);
3287 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3290 if (!mddev->raid_disks) {
3292 /* expecting a device which has a superblock */
3293 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3296 "md: md_import_device returned %ld\n",
3298 return PTR_ERR(rdev);
3300 if (!list_empty(&mddev->disks)) {
3301 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3302 mdk_rdev_t, same_set);
3303 int err = super_types[mddev->major_version]
3304 .load_super(rdev, rdev0, mddev->minor_version);
3307 "md: %s has different UUID to %s\n",
3308 bdevname(rdev->bdev,b),
3309 bdevname(rdev0->bdev,b2));
3314 err = bind_rdev_to_array(rdev, mddev);
3321 * add_new_disk can be used once the array is assembled
3322 * to add "hot spares". They must already have a superblock
3327 if (!mddev->pers->hot_add_disk) {
3329 "%s: personality does not support diskops!\n",
3333 if (mddev->persistent)
3334 rdev = md_import_device(dev, mddev->major_version,
3335 mddev->minor_version);
3337 rdev = md_import_device(dev, -1, -1);
3340 "md: md_import_device returned %ld\n",
3342 return PTR_ERR(rdev);
3344 /* set save_raid_disk if appropriate */
3345 if (!mddev->persistent) {
3346 if (info->state & (1<<MD_DISK_SYNC) &&
3347 info->raid_disk < mddev->raid_disks)
3348 rdev->raid_disk = info->raid_disk;
3350 rdev->raid_disk = -1;
3352 super_types[mddev->major_version].
3353 validate_super(mddev, rdev);
3354 rdev->saved_raid_disk = rdev->raid_disk;
3356 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3357 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3358 set_bit(WriteMostly, &rdev->flags);
3360 rdev->raid_disk = -1;
3361 err = bind_rdev_to_array(rdev, mddev);
3362 if (!err && !mddev->pers->hot_remove_disk) {
3363 /* If there is hot_add_disk but no hot_remove_disk
3364 * then added disks for geometry changes,
3365 * and should be added immediately.
3367 super_types[mddev->major_version].
3368 validate_super(mddev, rdev);
3369 err = mddev->pers->hot_add_disk(mddev, rdev);
3371 unbind_rdev_from_array(rdev);
3376 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3377 md_wakeup_thread(mddev->thread);
3381 /* otherwise, add_new_disk is only allowed
3382 * for major_version==0 superblocks
3384 if (mddev->major_version != 0) {
3385 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3390 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3392 rdev = md_import_device (dev, -1, 0);
3395 "md: error, md_import_device() returned %ld\n",
3397 return PTR_ERR(rdev);
3399 rdev->desc_nr = info->number;
3400 if (info->raid_disk < mddev->raid_disks)
3401 rdev->raid_disk = info->raid_disk;
3403 rdev->raid_disk = -1;
3407 if (rdev->raid_disk < mddev->raid_disks)
3408 if (info->state & (1<<MD_DISK_SYNC))
3409 set_bit(In_sync, &rdev->flags);
3411 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3412 set_bit(WriteMostly, &rdev->flags);
3414 if (!mddev->persistent) {
3415 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3416 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3418 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3419 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3421 err = bind_rdev_to_array(rdev, mddev);
3431 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3433 char b[BDEVNAME_SIZE];
3439 rdev = find_rdev(mddev, dev);
3443 if (rdev->raid_disk >= 0)
3446 kick_rdev_from_array(rdev);
3447 md_update_sb(mddev);
3448 md_new_event(mddev);
3452 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3453 bdevname(rdev->bdev,b), mdname(mddev));
3457 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3459 char b[BDEVNAME_SIZE];
3467 if (mddev->major_version != 0) {
3468 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3469 " version-0 superblocks.\n",
3473 if (!mddev->pers->hot_add_disk) {
3475 "%s: personality does not support diskops!\n",
3480 rdev = md_import_device (dev, -1, 0);
3483 "md: error, md_import_device() returned %ld\n",
3488 if (mddev->persistent)
3489 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3492 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3494 size = calc_dev_size(rdev, mddev->chunk_size);
3497 if (test_bit(Faulty, &rdev->flags)) {
3499 "md: can not hot-add faulty %s disk to %s!\n",
3500 bdevname(rdev->bdev,b), mdname(mddev));
3504 clear_bit(In_sync, &rdev->flags);
3506 err = bind_rdev_to_array(rdev, mddev);
3511 * The rest should better be atomic, we can have disk failures
3512 * noticed in interrupt contexts ...
3515 if (rdev->desc_nr == mddev->max_disks) {
3516 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3519 goto abort_unbind_export;
3522 rdev->raid_disk = -1;
3524 md_update_sb(mddev);
3527 * Kick recovery, maybe this spare has to be added to the
3528 * array immediately.
3530 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3531 md_wakeup_thread(mddev->thread);
3532 md_new_event(mddev);
3535 abort_unbind_export:
3536 unbind_rdev_from_array(rdev);
3543 /* similar to deny_write_access, but accounts for our holding a reference
3544 * to the file ourselves */
3545 static int deny_bitmap_write_access(struct file * file)
3547 struct inode *inode = file->f_mapping->host;
3549 spin_lock(&inode->i_lock);
3550 if (atomic_read(&inode->i_writecount) > 1) {
3551 spin_unlock(&inode->i_lock);
3554 atomic_set(&inode->i_writecount, -1);
3555 spin_unlock(&inode->i_lock);
3560 static int set_bitmap_file(mddev_t *mddev, int fd)
3565 if (!mddev->pers->quiesce)
3567 if (mddev->recovery || mddev->sync_thread)
3569 /* we should be able to change the bitmap.. */
3575 return -EEXIST; /* cannot add when bitmap is present */
3576 mddev->bitmap_file = fget(fd);
3578 if (mddev->bitmap_file == NULL) {
3579 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3584 err = deny_bitmap_write_access(mddev->bitmap_file);
3586 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3588 fput(mddev->bitmap_file);
3589 mddev->bitmap_file = NULL;
3592 mddev->bitmap_offset = 0; /* file overrides offset */
3593 } else if (mddev->bitmap == NULL)
3594 return -ENOENT; /* cannot remove what isn't there */
3597 mddev->pers->quiesce(mddev, 1);
3599 err = bitmap_create(mddev);
3601 bitmap_destroy(mddev);
3602 mddev->pers->quiesce(mddev, 0);
3603 } else if (fd < 0) {
3604 if (mddev->bitmap_file)
3605 fput(mddev->bitmap_file);
3606 mddev->bitmap_file = NULL;
3613 * set_array_info is used two different ways
3614 * The original usage is when creating a new array.
3615 * In this usage, raid_disks is > 0 and it together with
3616 * level, size, not_persistent,layout,chunksize determine the
3617 * shape of the array.
3618 * This will always create an array with a type-0.90.0 superblock.
3619 * The newer usage is when assembling an array.
3620 * In this case raid_disks will be 0, and the major_version field is
3621 * use to determine which style super-blocks are to be found on the devices.
3622 * The minor and patch _version numbers are also kept incase the
3623 * super_block handler wishes to interpret them.
3625 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3628 if (info->raid_disks == 0) {
3629 /* just setting version number for superblock loading */
3630 if (info->major_version < 0 ||
3631 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3632 super_types[info->major_version].name == NULL) {
3633 /* maybe try to auto-load a module? */
3635 "md: superblock version %d not known\n",
3636 info->major_version);
3639 mddev->major_version = info->major_version;
3640 mddev->minor_version = info->minor_version;
3641 mddev->patch_version = info->patch_version;
3644 mddev->major_version = MD_MAJOR_VERSION;
3645 mddev->minor_version = MD_MINOR_VERSION;
3646 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3647 mddev->ctime = get_seconds();
3649 mddev->level = info->level;
3650 mddev->clevel[0] = 0;
3651 mddev->size = info->size;
3652 mddev->raid_disks = info->raid_disks;
3653 /* don't set md_minor, it is determined by which /dev/md* was
3656 if (info->state & (1<<MD_SB_CLEAN))
3657 mddev->recovery_cp = MaxSector;
3659 mddev->recovery_cp = 0;
3660 mddev->persistent = ! info->not_persistent;
3662 mddev->layout = info->layout;
3663 mddev->chunk_size = info->chunk_size;
3665 mddev->max_disks = MD_SB_DISKS;
3667 mddev->sb_dirty = 1;
3669 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3670 mddev->bitmap_offset = 0;
3672 mddev->reshape_position = MaxSector;
3675 * Generate a 128 bit UUID
3677 get_random_bytes(mddev->uuid, 16);
3679 mddev->new_level = mddev->level;
3680 mddev->new_chunk = mddev->chunk_size;
3681 mddev->new_layout = mddev->layout;
3682 mddev->delta_disks = 0;
3687 static int update_size(mddev_t *mddev, unsigned long size)
3691 struct list_head *tmp;
3692 int fit = (size == 0);
3694 if (mddev->pers->resize == NULL)
3696 /* The "size" is the amount of each device that is used.
3697 * This can only make sense for arrays with redundancy.
3698 * linear and raid0 always use whatever space is available
3699 * We can only consider changing the size if no resync
3700 * or reconstruction is happening, and if the new size
3701 * is acceptable. It must fit before the sb_offset or,
3702 * if that is <data_offset, it must fit before the
3703 * size of each device.
3704 * If size is zero, we find the largest size that fits.
3706 if (mddev->sync_thread)
3708 ITERATE_RDEV(mddev,rdev,tmp) {
3710 if (rdev->sb_offset > rdev->data_offset)
3711 avail = (rdev->sb_offset*2) - rdev->data_offset;
3713 avail = get_capacity(rdev->bdev->bd_disk)
3714 - rdev->data_offset;
3715 if (fit && (size == 0 || size > avail/2))
3717 if (avail < ((sector_t)size << 1))
3720 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3722 struct block_device *bdev;
3724 bdev = bdget_disk(mddev->gendisk, 0);
3726 mutex_lock(&bdev->bd_inode->i_mutex);
3727 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
3728 mutex_unlock(&bdev->bd_inode->i_mutex);
3735 static int update_raid_disks(mddev_t *mddev, int raid_disks)
3738 /* change the number of raid disks */
3739 if (mddev->pers->check_reshape == NULL)
3741 if (raid_disks <= 0 ||
3742 raid_disks >= mddev->max_disks)
3744 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
3746 mddev->delta_disks = raid_disks - mddev->raid_disks;
3748 rv = mddev->pers->check_reshape(mddev);
3754 * update_array_info is used to change the configuration of an
3756 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3757 * fields in the info are checked against the array.
3758 * Any differences that cannot be handled will cause an error.
3759 * Normally, only one change can be managed at a time.
3761 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3767 /* calculate expected state,ignoring low bits */
3768 if (mddev->bitmap && mddev->bitmap_offset)
3769 state |= (1 << MD_SB_BITMAP_PRESENT);
3771 if (mddev->major_version != info->major_version ||
3772 mddev->minor_version != info->minor_version ||
3773 /* mddev->patch_version != info->patch_version || */
3774 mddev->ctime != info->ctime ||
3775 mddev->level != info->level ||
3776 /* mddev->layout != info->layout || */
3777 !mddev->persistent != info->not_persistent||
3778 mddev->chunk_size != info->chunk_size ||
3779 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3780 ((state^info->state) & 0xfffffe00)
3783 /* Check there is only one change */
3784 if (info->size >= 0 && mddev->size != info->size) cnt++;
3785 if (mddev->raid_disks != info->raid_disks) cnt++;
3786 if (mddev->layout != info->layout) cnt++;
3787 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
3788 if (cnt == 0) return 0;
3789 if (cnt > 1) return -EINVAL;
3791 if (mddev->layout != info->layout) {
3793 * we don't need to do anything at the md level, the
3794 * personality will take care of it all.
3796 if (mddev->pers->reconfig == NULL)
3799 return mddev->pers->reconfig(mddev, info->layout, -1);
3801 if (info->size >= 0 && mddev->size != info->size)
3802 rv = update_size(mddev, info->size);
3804 if (mddev->raid_disks != info->raid_disks)
3805 rv = update_raid_disks(mddev, info->raid_disks);
3807 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3808 if (mddev->pers->quiesce == NULL)
3810 if (mddev->recovery || mddev->sync_thread)
3812 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3813 /* add the bitmap */
3816 if (mddev->default_bitmap_offset == 0)
3818 mddev->bitmap_offset = mddev->default_bitmap_offset;
3819 mddev->pers->quiesce(mddev, 1);
3820 rv = bitmap_create(mddev);
3822 bitmap_destroy(mddev);
3823 mddev->pers->quiesce(mddev, 0);
3825 /* remove the bitmap */
3828 if (mddev->bitmap->file)
3830 mddev->pers->quiesce(mddev, 1);
3831 bitmap_destroy(mddev);
3832 mddev->pers->quiesce(mddev, 0);
3833 mddev->bitmap_offset = 0;
3836 md_update_sb(mddev);
3840 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3844 if (mddev->pers == NULL)
3847 rdev = find_rdev(mddev, dev);
3851 md_error(mddev, rdev);
3855 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3857 mddev_t *mddev = bdev->bd_disk->private_data;
3861 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3865 static int md_ioctl(struct inode *inode, struct file *file,
3866 unsigned int cmd, unsigned long arg)
3869 void __user *argp = (void __user *)arg;
3870 mddev_t *mddev = NULL;
3872 if (!capable(CAP_SYS_ADMIN))
3876 * Commands dealing with the RAID driver but not any
3882 err = get_version(argp);
3885 case PRINT_RAID_DEBUG:
3893 autostart_arrays(arg);
3900 * Commands creating/starting a new array:
3903 mddev = inode->i_bdev->bd_disk->private_data;
3911 if (cmd == START_ARRAY) {
3912 /* START_ARRAY doesn't need to lock the array as autostart_array
3913 * does the locking, and it could even be a different array
3918 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3919 "This will not be supported beyond July 2006\n",
3920 current->comm, current->pid);
3923 err = autostart_array(new_decode_dev(arg));
3925 printk(KERN_WARNING "md: autostart failed!\n");
3931 err = mddev_lock(mddev);
3934 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3941 case SET_ARRAY_INFO:
3943 mdu_array_info_t info;
3945 memset(&info, 0, sizeof(info));
3946 else if (copy_from_user(&info, argp, sizeof(info))) {
3951 err = update_array_info(mddev, &info);
3953 printk(KERN_WARNING "md: couldn't update"
3954 " array info. %d\n", err);
3959 if (!list_empty(&mddev->disks)) {
3961 "md: array %s already has disks!\n",
3966 if (mddev->raid_disks) {
3968 "md: array %s already initialised!\n",
3973 err = set_array_info(mddev, &info);
3975 printk(KERN_WARNING "md: couldn't set"
3976 " array info. %d\n", err);
3986 * Commands querying/configuring an existing array:
3988 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3989 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3990 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3991 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
3997 * Commands even a read-only array can execute:
4001 case GET_ARRAY_INFO:
4002 err = get_array_info(mddev, argp);
4005 case GET_BITMAP_FILE:
4006 err = get_bitmap_file(mddev, argp);
4010 err = get_disk_info(mddev, argp);
4013 case RESTART_ARRAY_RW:
4014 err = restart_array(mddev);
4018 err = do_md_stop (mddev, 0);
4022 err = do_md_stop (mddev, 1);
4026 * We have a problem here : there is no easy way to give a CHS
4027 * virtual geometry. We currently pretend that we have a 2 heads
4028 * 4 sectors (with a BIG number of cylinders...). This drives
4029 * dosfs just mad... ;-)
4034 * The remaining ioctls are changing the state of the
4035 * superblock, so we do not allow them on read-only arrays.
4036 * However non-MD ioctls (e.g. get-size) will still come through
4037 * here and hit the 'default' below, so only disallow
4038 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4040 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4041 mddev->ro && mddev->pers) {
4042 if (mddev->ro == 2) {
4044 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4045 md_wakeup_thread(mddev->thread);
4057 mdu_disk_info_t info;
4058 if (copy_from_user(&info, argp, sizeof(info)))
4061 err = add_new_disk(mddev, &info);
4065 case HOT_REMOVE_DISK:
4066 err = hot_remove_disk(mddev, new_decode_dev(arg));
4070 err = hot_add_disk(mddev, new_decode_dev(arg));
4073 case SET_DISK_FAULTY:
4074 err = set_disk_faulty(mddev, new_decode_dev(arg));
4078 err = do_md_run (mddev);
4081 case SET_BITMAP_FILE:
4082 err = set_bitmap_file(mddev, (int)arg);
4092 mddev_unlock(mddev);
4102 static int md_open(struct inode *inode, struct file *file)
4105 * Succeed if we can lock the mddev, which confirms that
4106 * it isn't being stopped right now.
4108 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4111 if ((err = mddev_lock(mddev)))
4116 mddev_unlock(mddev);
4118 check_disk_change(inode->i_bdev);
4123 static int md_release(struct inode *inode, struct file * file)
4125 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4134 static int md_media_changed(struct gendisk *disk)
4136 mddev_t *mddev = disk->private_data;
4138 return mddev->changed;
4141 static int md_revalidate(struct gendisk *disk)
4143 mddev_t *mddev = disk->private_data;
4148 static struct block_device_operations md_fops =
4150 .owner = THIS_MODULE,
4152 .release = md_release,
4154 .getgeo = md_getgeo,
4155 .media_changed = md_media_changed,
4156 .revalidate_disk= md_revalidate,
4159 static int md_thread(void * arg)
4161 mdk_thread_t *thread = arg;
4164 * md_thread is a 'system-thread', it's priority should be very
4165 * high. We avoid resource deadlocks individually in each
4166 * raid personality. (RAID5 does preallocation) We also use RR and
4167 * the very same RT priority as kswapd, thus we will never get
4168 * into a priority inversion deadlock.
4170 * we definitely have to have equal or higher priority than
4171 * bdflush, otherwise bdflush will deadlock if there are too
4172 * many dirty RAID5 blocks.
4175 allow_signal(SIGKILL);
4176 while (!kthread_should_stop()) {
4178 /* We need to wait INTERRUPTIBLE so that
4179 * we don't add to the load-average.
4180 * That means we need to be sure no signals are
4183 if (signal_pending(current))
4184 flush_signals(current);
4186 wait_event_interruptible_timeout
4188 test_bit(THREAD_WAKEUP, &thread->flags)
4189 || kthread_should_stop(),
4193 clear_bit(THREAD_WAKEUP, &thread->flags);
4195 thread->run(thread->mddev);
4201 void md_wakeup_thread(mdk_thread_t *thread)
4204 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4205 set_bit(THREAD_WAKEUP, &thread->flags);
4206 wake_up(&thread->wqueue);
4210 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4213 mdk_thread_t *thread;
4215 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
4219 init_waitqueue_head(&thread->wqueue);
4222 thread->mddev = mddev;
4223 thread->timeout = MAX_SCHEDULE_TIMEOUT;
4224 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
4225 if (IS_ERR(thread->tsk)) {
4232 void md_unregister_thread(mdk_thread_t *thread)
4234 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
4236 kthread_stop(thread->tsk);
4240 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4247 if (!rdev || test_bit(Faulty, &rdev->flags))
4250 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4252 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4253 __builtin_return_address(0),__builtin_return_address(1),
4254 __builtin_return_address(2),__builtin_return_address(3));
4256 if (!mddev->pers->error_handler)
4258 mddev->pers->error_handler(mddev,rdev);
4259 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4260 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4261 md_wakeup_thread(mddev->thread);
4262 md_new_event_inintr(mddev);
4265 /* seq_file implementation /proc/mdstat */
4267 static void status_unused(struct seq_file *seq)
4271 struct list_head *tmp;
4273 seq_printf(seq, "unused devices: ");
4275 ITERATE_RDEV_PENDING(rdev,tmp) {
4276 char b[BDEVNAME_SIZE];
4278 seq_printf(seq, "%s ",
4279 bdevname(rdev->bdev,b));
4282 seq_printf(seq, "<none>");
4284 seq_printf(seq, "\n");
4288 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4290 sector_t max_blocks, resync, res;
4291 unsigned long dt, db, rt;
4293 unsigned int per_milli;
4295 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4297 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4298 max_blocks = mddev->resync_max_sectors >> 1;
4300 max_blocks = mddev->size;
4303 * Should not happen.
4309 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4310 * in a sector_t, and (max_blocks>>scale) will fit in a
4311 * u32, as those are the requirements for sector_div.
4312 * Thus 'scale' must be at least 10
4315 if (sizeof(sector_t) > sizeof(unsigned long)) {
4316 while ( max_blocks/2 > (1ULL<<(scale+32)))
4319 res = (resync>>scale)*1000;
4320 sector_div(res, (u32)((max_blocks>>scale)+1));
4324 int i, x = per_milli/50, y = 20-x;
4325 seq_printf(seq, "[");
4326 for (i = 0; i < x; i++)
4327 seq_printf(seq, "=");
4328 seq_printf(seq, ">");
4329 for (i = 0; i < y; i++)
4330 seq_printf(seq, ".");
4331 seq_printf(seq, "] ");
4333 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4334 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4336 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4337 "resync" : "recovery")),
4338 per_milli/10, per_milli % 10,
4339 (unsigned long long) resync,
4340 (unsigned long long) max_blocks);
4343 * We do not want to overflow, so the order of operands and
4344 * the * 100 / 100 trick are important. We do a +1 to be
4345 * safe against division by zero. We only estimate anyway.
4347 * dt: time from mark until now
4348 * db: blocks written from mark until now
4349 * rt: remaining time
4351 dt = ((jiffies - mddev->resync_mark) / HZ);
4353 db = resync - (mddev->resync_mark_cnt/2);
4354 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
4356 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4358 seq_printf(seq, " speed=%ldK/sec", db/dt);
4361 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4363 struct list_head *tmp;
4373 spin_lock(&all_mddevs_lock);
4374 list_for_each(tmp,&all_mddevs)
4376 mddev = list_entry(tmp, mddev_t, all_mddevs);
4378 spin_unlock(&all_mddevs_lock);
4381 spin_unlock(&all_mddevs_lock);
4383 return (void*)2;/* tail */
4387 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4389 struct list_head *tmp;
4390 mddev_t *next_mddev, *mddev = v;
4396 spin_lock(&all_mddevs_lock);
4398 tmp = all_mddevs.next;
4400 tmp = mddev->all_mddevs.next;
4401 if (tmp != &all_mddevs)
4402 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4404 next_mddev = (void*)2;
4407 spin_unlock(&all_mddevs_lock);
4415 static void md_seq_stop(struct seq_file *seq, void *v)
4419 if (mddev && v != (void*)1 && v != (void*)2)
4423 struct mdstat_info {
4427 static int md_seq_show(struct seq_file *seq, void *v)
4431 struct list_head *tmp2;
4433 struct mdstat_info *mi = seq->private;
4434 struct bitmap *bitmap;
4436 if (v == (void*)1) {
4437 struct mdk_personality *pers;
4438 seq_printf(seq, "Personalities : ");
4439 spin_lock(&pers_lock);
4440 list_for_each_entry(pers, &pers_list, list)
4441 seq_printf(seq, "[%s] ", pers->name);
4443 spin_unlock(&pers_lock);
4444 seq_printf(seq, "\n");
4445 mi->event = atomic_read(&md_event_count);
4448 if (v == (void*)2) {
4453 if (mddev_lock(mddev) < 0)
4456 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4457 seq_printf(seq, "%s : %sactive", mdname(mddev),
4458 mddev->pers ? "" : "in");
4461 seq_printf(seq, " (read-only)");
4463 seq_printf(seq, "(auto-read-only)");
4464 seq_printf(seq, " %s", mddev->pers->name);
4468 ITERATE_RDEV(mddev,rdev,tmp2) {
4469 char b[BDEVNAME_SIZE];
4470 seq_printf(seq, " %s[%d]",
4471 bdevname(rdev->bdev,b), rdev->desc_nr);
4472 if (test_bit(WriteMostly, &rdev->flags))
4473 seq_printf(seq, "(W)");
4474 if (test_bit(Faulty, &rdev->flags)) {
4475 seq_printf(seq, "(F)");
4477 } else if (rdev->raid_disk < 0)
4478 seq_printf(seq, "(S)"); /* spare */
4482 if (!list_empty(&mddev->disks)) {
4484 seq_printf(seq, "\n %llu blocks",
4485 (unsigned long long)mddev->array_size);
4487 seq_printf(seq, "\n %llu blocks",
4488 (unsigned long long)size);
4490 if (mddev->persistent) {
4491 if (mddev->major_version != 0 ||
4492 mddev->minor_version != 90) {
4493 seq_printf(seq," super %d.%d",
4494 mddev->major_version,
4495 mddev->minor_version);
4498 seq_printf(seq, " super non-persistent");
4501 mddev->pers->status (seq, mddev);
4502 seq_printf(seq, "\n ");
4503 if (mddev->pers->sync_request) {
4504 if (mddev->curr_resync > 2) {
4505 status_resync (seq, mddev);
4506 seq_printf(seq, "\n ");
4507 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4508 seq_printf(seq, "\tresync=DELAYED\n ");
4509 else if (mddev->recovery_cp < MaxSector)
4510 seq_printf(seq, "\tresync=PENDING\n ");
4513 seq_printf(seq, "\n ");
4515 if ((bitmap = mddev->bitmap)) {
4516 unsigned long chunk_kb;
4517 unsigned long flags;
4518 spin_lock_irqsave(&bitmap->lock, flags);
4519 chunk_kb = bitmap->chunksize >> 10;
4520 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4522 bitmap->pages - bitmap->missing_pages,
4524 (bitmap->pages - bitmap->missing_pages)
4525 << (PAGE_SHIFT - 10),
4526 chunk_kb ? chunk_kb : bitmap->chunksize,
4527 chunk_kb ? "KB" : "B");
4529 seq_printf(seq, ", file: ");
4530 seq_path(seq, bitmap->file->f_vfsmnt,
4531 bitmap->file->f_dentry," \t\n");
4534 seq_printf(seq, "\n");
4535 spin_unlock_irqrestore(&bitmap->lock, flags);
4538 seq_printf(seq, "\n");
4540 mddev_unlock(mddev);
4545 static struct seq_operations md_seq_ops = {
4546 .start = md_seq_start,
4547 .next = md_seq_next,
4548 .stop = md_seq_stop,
4549 .show = md_seq_show,
4552 static int md_seq_open(struct inode *inode, struct file *file)
4555 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4559 error = seq_open(file, &md_seq_ops);
4563 struct seq_file *p = file->private_data;
4565 mi->event = atomic_read(&md_event_count);
4570 static int md_seq_release(struct inode *inode, struct file *file)
4572 struct seq_file *m = file->private_data;
4573 struct mdstat_info *mi = m->private;
4576 return seq_release(inode, file);
4579 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4581 struct seq_file *m = filp->private_data;
4582 struct mdstat_info *mi = m->private;
4585 poll_wait(filp, &md_event_waiters, wait);
4587 /* always allow read */
4588 mask = POLLIN | POLLRDNORM;
4590 if (mi->event != atomic_read(&md_event_count))
4591 mask |= POLLERR | POLLPRI;
4595 static struct file_operations md_seq_fops = {
4596 .open = md_seq_open,
4598 .llseek = seq_lseek,
4599 .release = md_seq_release,
4600 .poll = mdstat_poll,
4603 int register_md_personality(struct mdk_personality *p)
4605 spin_lock(&pers_lock);
4606 list_add_tail(&p->list, &pers_list);
4607 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4608 spin_unlock(&pers_lock);
4612 int unregister_md_personality(struct mdk_personality *p)
4614 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4615 spin_lock(&pers_lock);
4616 list_del_init(&p->list);
4617 spin_unlock(&pers_lock);
4621 static int is_mddev_idle(mddev_t *mddev)
4624 struct list_head *tmp;
4626 unsigned long curr_events;
4629 ITERATE_RDEV(mddev,rdev,tmp) {
4630 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
4631 curr_events = disk_stat_read(disk, sectors[0]) +
4632 disk_stat_read(disk, sectors[1]) -
4633 atomic_read(&disk->sync_io);
4634 /* The difference between curr_events and last_events
4635 * will be affected by any new non-sync IO (making
4636 * curr_events bigger) and any difference in the amount of
4637 * in-flight syncio (making current_events bigger or smaller)
4638 * The amount in-flight is currently limited to
4639 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4640 * which is at most 4096 sectors.
4641 * These numbers are fairly fragile and should be made
4642 * more robust, probably by enforcing the
4643 * 'window size' that md_do_sync sort-of uses.
4645 * Note: the following is an unsigned comparison.
4647 if ((curr_events - rdev->last_events + 4096) > 8192) {
4648 rdev->last_events = curr_events;
4655 void md_done_sync(mddev_t *mddev, int blocks, int ok)
4657 /* another "blocks" (512byte) blocks have been synced */
4658 atomic_sub(blocks, &mddev->recovery_active);
4659 wake_up(&mddev->recovery_wait);
4661 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4662 md_wakeup_thread(mddev->thread);
4663 // stop recovery, signal do_sync ....
4668 /* md_write_start(mddev, bi)
4669 * If we need to update some array metadata (e.g. 'active' flag
4670 * in superblock) before writing, schedule a superblock update
4671 * and wait for it to complete.
4673 void md_write_start(mddev_t *mddev, struct bio *bi)
4675 if (bio_data_dir(bi) != WRITE)
4678 BUG_ON(mddev->ro == 1);
4679 if (mddev->ro == 2) {
4680 /* need to switch to read/write */
4682 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4683 md_wakeup_thread(mddev->thread);
4685 atomic_inc(&mddev->writes_pending);
4686 if (mddev->in_sync) {
4687 spin_lock_irq(&mddev->write_lock);
4688 if (mddev->in_sync) {
4690 mddev->sb_dirty = 1;
4691 md_wakeup_thread(mddev->thread);
4693 spin_unlock_irq(&mddev->write_lock);
4695 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
4698 void md_write_end(mddev_t *mddev)
4700 if (atomic_dec_and_test(&mddev->writes_pending)) {
4701 if (mddev->safemode == 2)
4702 md_wakeup_thread(mddev->thread);
4703 else if (mddev->safemode_delay)
4704 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4708 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
4710 #define SYNC_MARKS 10
4711 #define SYNC_MARK_STEP (3*HZ)
4712 void md_do_sync(mddev_t *mddev)
4715 unsigned int currspeed = 0,
4717 sector_t max_sectors,j, io_sectors;
4718 unsigned long mark[SYNC_MARKS];
4719 sector_t mark_cnt[SYNC_MARKS];
4721 struct list_head *tmp;
4722 sector_t last_check;
4724 struct list_head *rtmp;
4727 /* just incase thread restarts... */
4728 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4730 if (mddev->ro) /* never try to sync a read-only array */
4733 /* we overload curr_resync somewhat here.
4734 * 0 == not engaged in resync at all
4735 * 2 == checking that there is no conflict with another sync
4736 * 1 == like 2, but have yielded to allow conflicting resync to
4738 * other == active in resync - this many blocks
4740 * Before starting a resync we must have set curr_resync to
4741 * 2, and then checked that every "conflicting" array has curr_resync
4742 * less than ours. When we find one that is the same or higher
4743 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4744 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4745 * This will mean we have to start checking from the beginning again.
4750 mddev->curr_resync = 2;
4753 if (kthread_should_stop()) {
4754 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4757 ITERATE_MDDEV(mddev2,tmp) {
4758 if (mddev2 == mddev)
4760 if (mddev2->curr_resync &&
4761 match_mddev_units(mddev,mddev2)) {
4763 if (mddev < mddev2 && mddev->curr_resync == 2) {
4764 /* arbitrarily yield */
4765 mddev->curr_resync = 1;
4766 wake_up(&resync_wait);
4768 if (mddev > mddev2 && mddev->curr_resync == 1)
4769 /* no need to wait here, we can wait the next
4770 * time 'round when curr_resync == 2
4773 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4774 if (!kthread_should_stop() &&
4775 mddev2->curr_resync >= mddev->curr_resync) {
4776 printk(KERN_INFO "md: delaying resync of %s"
4777 " until %s has finished resync (they"
4778 " share one or more physical units)\n",
4779 mdname(mddev), mdname(mddev2));
4782 finish_wait(&resync_wait, &wq);
4785 finish_wait(&resync_wait, &wq);
4788 } while (mddev->curr_resync < 2);
4791 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4792 /* resync follows the size requested by the personality,
4793 * which defaults to physical size, but can be virtual size
4795 max_sectors = mddev->resync_max_sectors;
4796 mddev->resync_mismatches = 0;
4797 /* we don't use the checkpoint if there's a bitmap */
4798 if (!mddev->bitmap &&
4799 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4800 j = mddev->recovery_cp;
4801 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4802 max_sectors = mddev->size << 1;
4804 /* recovery follows the physical size of devices */
4805 max_sectors = mddev->size << 1;
4807 ITERATE_RDEV(mddev,rdev,rtmp)
4808 if (rdev->raid_disk >= 0 &&
4809 !test_bit(Faulty, &rdev->flags) &&
4810 !test_bit(In_sync, &rdev->flags) &&
4811 rdev->recovery_offset < j)
4812 j = rdev->recovery_offset;
4815 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4816 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4817 " %d KB/sec/disc.\n", speed_min(mddev));
4818 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
4819 "(but not more than %d KB/sec) for reconstruction.\n",
4822 is_mddev_idle(mddev); /* this also initializes IO event counters */
4825 for (m = 0; m < SYNC_MARKS; m++) {
4827 mark_cnt[m] = io_sectors;
4830 mddev->resync_mark = mark[last_mark];
4831 mddev->resync_mark_cnt = mark_cnt[last_mark];
4834 * Tune reconstruction:
4836 window = 32*(PAGE_SIZE/512);
4837 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4838 window/2,(unsigned long long) max_sectors/2);
4840 atomic_set(&mddev->recovery_active, 0);
4841 init_waitqueue_head(&mddev->recovery_wait);
4846 "md: resuming recovery of %s from checkpoint.\n",
4848 mddev->curr_resync = j;
4851 while (j < max_sectors) {
4855 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4856 currspeed < speed_min(mddev));
4858 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4862 if (!skipped) { /* actual IO requested */
4863 io_sectors += sectors;
4864 atomic_add(sectors, &mddev->recovery_active);
4868 if (j>1) mddev->curr_resync = j;
4869 if (last_check == 0)
4870 /* this is the earliers that rebuilt will be
4871 * visible in /proc/mdstat
4873 md_new_event(mddev);
4875 if (last_check + window > io_sectors || j == max_sectors)
4878 last_check = io_sectors;
4880 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4881 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4885 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4887 int next = (last_mark+1) % SYNC_MARKS;
4889 mddev->resync_mark = mark[next];
4890 mddev->resync_mark_cnt = mark_cnt[next];
4891 mark[next] = jiffies;
4892 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
4897 if (kthread_should_stop()) {
4899 * got a signal, exit.
4902 "md: md_do_sync() got signal ... exiting\n");
4903 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4908 * this loop exits only if either when we are slower than
4909 * the 'hard' speed limit, or the system was IO-idle for
4911 * the system might be non-idle CPU-wise, but we only care
4912 * about not overloading the IO subsystem. (things like an
4913 * e2fsck being done on the RAID array should execute fast)
4915 mddev->queue->unplug_fn(mddev->queue);
4918 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4919 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4921 if (currspeed > speed_min(mddev)) {
4922 if ((currspeed > speed_max(mddev)) ||
4923 !is_mddev_idle(mddev)) {
4929 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4931 * this also signals 'finished resyncing' to md_stop
4934 mddev->queue->unplug_fn(mddev->queue);
4936 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4938 /* tell personality that we are finished */
4939 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
4941 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4942 test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
4943 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
4944 mddev->curr_resync > 2) {
4945 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4946 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4947 if (mddev->curr_resync >= mddev->recovery_cp) {
4949 "md: checkpointing recovery of %s.\n",
4951 mddev->recovery_cp = mddev->curr_resync;
4954 mddev->recovery_cp = MaxSector;
4956 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
4957 mddev->curr_resync = MaxSector;
4958 ITERATE_RDEV(mddev,rdev,rtmp)
4959 if (rdev->raid_disk >= 0 &&
4960 !test_bit(Faulty, &rdev->flags) &&
4961 !test_bit(In_sync, &rdev->flags) &&
4962 rdev->recovery_offset < mddev->curr_resync)
4963 rdev->recovery_offset = mddev->curr_resync;
4964 mddev->sb_dirty = 1;
4969 mddev->curr_resync = 0;
4970 wake_up(&resync_wait);
4971 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4972 md_wakeup_thread(mddev->thread);
4974 EXPORT_SYMBOL_GPL(md_do_sync);
4978 * This routine is regularly called by all per-raid-array threads to
4979 * deal with generic issues like resync and super-block update.
4980 * Raid personalities that don't have a thread (linear/raid0) do not
4981 * need this as they never do any recovery or update the superblock.
4983 * It does not do any resync itself, but rather "forks" off other threads
4984 * to do that as needed.
4985 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4986 * "->recovery" and create a thread at ->sync_thread.
4987 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4988 * and wakeups up this thread which will reap the thread and finish up.
4989 * This thread also removes any faulty devices (with nr_pending == 0).
4991 * The overall approach is:
4992 * 1/ if the superblock needs updating, update it.
4993 * 2/ If a recovery thread is running, don't do anything else.
4994 * 3/ If recovery has finished, clean up, possibly marking spares active.
4995 * 4/ If there are any faulty devices, remove them.
4996 * 5/ If array is degraded, try to add spares devices
4997 * 6/ If array has spares or is not in-sync, start a resync thread.
4999 void md_check_recovery(mddev_t *mddev)
5002 struct list_head *rtmp;
5006 bitmap_daemon_work(mddev->bitmap);
5011 if (signal_pending(current)) {
5012 if (mddev->pers->sync_request) {
5013 printk(KERN_INFO "md: %s in immediate safe mode\n",
5015 mddev->safemode = 2;
5017 flush_signals(current);
5022 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5023 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5024 (mddev->safemode == 1) ||
5025 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5026 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5030 if (mddev_trylock(mddev)) {
5033 spin_lock_irq(&mddev->write_lock);
5034 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5035 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5037 mddev->sb_dirty = 1;
5039 if (mddev->safemode == 1)
5040 mddev->safemode = 0;
5041 spin_unlock_irq(&mddev->write_lock);
5043 if (mddev->sb_dirty)
5044 md_update_sb(mddev);
5047 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5048 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5049 /* resync/recovery still happening */
5050 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5053 if (mddev->sync_thread) {
5054 /* resync has finished, collect result */
5055 md_unregister_thread(mddev->sync_thread);
5056 mddev->sync_thread = NULL;
5057 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5058 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5060 /* activate any spares */
5061 mddev->pers->spare_active(mddev);
5063 md_update_sb(mddev);
5065 /* if array is no-longer degraded, then any saved_raid_disk
5066 * information must be scrapped
5068 if (!mddev->degraded)
5069 ITERATE_RDEV(mddev,rdev,rtmp)
5070 rdev->saved_raid_disk = -1;
5072 mddev->recovery = 0;
5073 /* flag recovery needed just to double check */
5074 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5075 md_new_event(mddev);
5078 /* Clear some bits that don't mean anything, but
5081 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5082 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5083 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5084 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
5086 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5088 /* no recovery is running.
5089 * remove any failed drives, then
5090 * add spares if possible.
5091 * Spare are also removed and re-added, to allow
5092 * the personality to fail the re-add.
5094 ITERATE_RDEV(mddev,rdev,rtmp)
5095 if (rdev->raid_disk >= 0 &&
5096 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
5097 atomic_read(&rdev->nr_pending)==0) {
5098 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
5100 sprintf(nm,"rd%d", rdev->raid_disk);
5101 sysfs_remove_link(&mddev->kobj, nm);
5102 rdev->raid_disk = -1;
5106 if (mddev->degraded) {
5107 ITERATE_RDEV(mddev,rdev,rtmp)
5108 if (rdev->raid_disk < 0
5109 && !test_bit(Faulty, &rdev->flags)) {
5110 rdev->recovery_offset = 0;
5111 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5113 sprintf(nm, "rd%d", rdev->raid_disk);
5114 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
5116 md_new_event(mddev);
5123 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5124 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5125 } else if (mddev->recovery_cp < MaxSector) {
5126 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5127 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5128 /* nothing to be done ... */
5131 if (mddev->pers->sync_request) {
5132 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
5133 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5134 /* We are adding a device or devices to an array
5135 * which has the bitmap stored on all devices.
5136 * So make sure all bitmap pages get written
5138 bitmap_write_all(mddev->bitmap);
5140 mddev->sync_thread = md_register_thread(md_do_sync,
5143 if (!mddev->sync_thread) {
5144 printk(KERN_ERR "%s: could not start resync"
5147 /* leave the spares where they are, it shouldn't hurt */
5148 mddev->recovery = 0;
5150 md_wakeup_thread(mddev->sync_thread);
5151 md_new_event(mddev);
5154 mddev_unlock(mddev);
5158 static int md_notify_reboot(struct notifier_block *this,
5159 unsigned long code, void *x)
5161 struct list_head *tmp;
5164 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5166 printk(KERN_INFO "md: stopping all md devices.\n");
5168 ITERATE_MDDEV(mddev,tmp)
5169 if (mddev_trylock(mddev)) {
5170 do_md_stop (mddev, 1);
5171 mddev_unlock(mddev);
5174 * certain more exotic SCSI devices are known to be
5175 * volatile wrt too early system reboots. While the
5176 * right place to handle this issue is the given
5177 * driver, we do want to have a safe RAID driver ...
5184 static struct notifier_block md_notifier = {
5185 .notifier_call = md_notify_reboot,
5187 .priority = INT_MAX, /* before any real devices */
5190 static void md_geninit(void)
5192 struct proc_dir_entry *p;
5194 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5196 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5198 p->proc_fops = &md_seq_fops;
5201 static int __init md_init(void)
5205 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5206 " MD_SB_DISKS=%d\n",
5207 MD_MAJOR_VERSION, MD_MINOR_VERSION,
5208 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
5209 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
5212 if (register_blkdev(MAJOR_NR, "md"))
5214 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5215 unregister_blkdev(MAJOR_NR, "md");
5219 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
5220 md_probe, NULL, NULL);
5221 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
5222 md_probe, NULL, NULL);
5224 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5225 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
5226 S_IFBLK|S_IRUSR|S_IWUSR,
5229 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5230 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
5231 S_IFBLK|S_IRUSR|S_IWUSR,
5235 register_reboot_notifier(&md_notifier);
5236 raid_table_header = register_sysctl_table(raid_root_table, 1);
5246 * Searches all registered partitions for autorun RAID arrays
5249 static dev_t detected_devices[128];
5252 void md_autodetect_dev(dev_t dev)
5254 if (dev_cnt >= 0 && dev_cnt < 127)
5255 detected_devices[dev_cnt++] = dev;
5259 static void autostart_arrays(int part)
5264 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5266 for (i = 0; i < dev_cnt; i++) {
5267 dev_t dev = detected_devices[i];
5269 rdev = md_import_device(dev,0, 0);
5273 if (test_bit(Faulty, &rdev->flags)) {
5277 list_add(&rdev->same_set, &pending_raid_disks);
5281 autorun_devices(part);
5286 static __exit void md_exit(void)
5289 struct list_head *tmp;
5291 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5292 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
5293 for (i=0; i < MAX_MD_DEVS; i++)
5294 devfs_remove("md/%d", i);
5295 for (i=0; i < MAX_MD_DEVS; i++)
5296 devfs_remove("md/d%d", i);
5300 unregister_blkdev(MAJOR_NR,"md");
5301 unregister_blkdev(mdp_major, "mdp");
5302 unregister_reboot_notifier(&md_notifier);
5303 unregister_sysctl_table(raid_table_header);
5304 remove_proc_entry("mdstat", NULL);
5305 ITERATE_MDDEV(mddev,tmp) {
5306 struct gendisk *disk = mddev->gendisk;
5309 export_array(mddev);
5312 mddev->gendisk = NULL;
5317 module_init(md_init)
5318 module_exit(md_exit)
5320 static int get_ro(char *buffer, struct kernel_param *kp)
5322 return sprintf(buffer, "%d", start_readonly);
5324 static int set_ro(const char *val, struct kernel_param *kp)
5327 int num = simple_strtoul(val, &e, 10);
5328 if (*val && (*e == '\0' || *e == '\n')) {
5329 start_readonly = num;
5335 module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
5336 module_param(start_dirty_degraded, int, 0644);
5339 EXPORT_SYMBOL(register_md_personality);
5340 EXPORT_SYMBOL(unregister_md_personality);
5341 EXPORT_SYMBOL(md_error);
5342 EXPORT_SYMBOL(md_done_sync);
5343 EXPORT_SYMBOL(md_write_start);
5344 EXPORT_SYMBOL(md_write_end);
5345 EXPORT_SYMBOL(md_register_thread);
5346 EXPORT_SYMBOL(md_unregister_thread);
5347 EXPORT_SYMBOL(md_wakeup_thread);
5348 EXPORT_SYMBOL(md_print_devices);
5349 EXPORT_SYMBOL(md_check_recovery);
5350 MODULE_LICENSE("GPL");
5352 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);