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/kernel.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/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part);
72 static LIST_HEAD(pers_list);
73 static DEFINE_SPINLOCK(pers_lock);
75 static void md_print_devices(void);
77 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
79 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min = 1000;
95 static int sysctl_speed_limit_max = 200000;
96 static inline int speed_min(mddev_t *mddev)
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
102 static inline int speed_max(mddev_t *mddev)
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
108 static struct ctl_table_header *raid_table_header;
110 static ctl_table raid_table[] = {
112 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
113 .procname = "speed_limit_min",
114 .data = &sysctl_speed_limit_min,
115 .maxlen = sizeof(int),
116 .mode = S_IRUGO|S_IWUSR,
117 .proc_handler = &proc_dointvec,
120 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
121 .procname = "speed_limit_max",
122 .data = &sysctl_speed_limit_max,
123 .maxlen = sizeof(int),
124 .mode = S_IRUGO|S_IWUSR,
125 .proc_handler = &proc_dointvec,
130 static ctl_table raid_dir_table[] = {
132 .ctl_name = DEV_RAID,
135 .mode = S_IRUGO|S_IXUGO,
141 static ctl_table raid_root_table[] = {
147 .child = raid_dir_table,
152 static struct block_device_operations md_fops;
154 static int start_readonly;
157 * We have a system wide 'event count' that is incremented
158 * on any 'interesting' event, and readers of /proc/mdstat
159 * can use 'poll' or 'select' to find out when the event
163 * start array, stop array, error, add device, remove device,
164 * start build, activate spare
166 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
167 static atomic_t md_event_count;
168 void md_new_event(mddev_t *mddev)
170 atomic_inc(&md_event_count);
171 wake_up(&md_event_waiters);
172 sysfs_notify(&mddev->kobj, NULL, "sync_action");
174 EXPORT_SYMBOL_GPL(md_new_event);
176 /* Alternate version that can be called from interrupts
177 * when calling sysfs_notify isn't needed.
179 static void md_new_event_inintr(mddev_t *mddev)
181 atomic_inc(&md_event_count);
182 wake_up(&md_event_waiters);
186 * Enables to iterate over all existing md arrays
187 * all_mddevs_lock protects this list.
189 static LIST_HEAD(all_mddevs);
190 static DEFINE_SPINLOCK(all_mddevs_lock);
194 * iterates through all used mddevs in the system.
195 * We take care to grab the all_mddevs_lock whenever navigating
196 * the list, and to always hold a refcount when unlocked.
197 * Any code which breaks out of this loop while own
198 * a reference to the current mddev and must mddev_put it.
200 #define for_each_mddev(mddev,tmp) \
202 for (({ spin_lock(&all_mddevs_lock); \
203 tmp = all_mddevs.next; \
205 ({ if (tmp != &all_mddevs) \
206 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
207 spin_unlock(&all_mddevs_lock); \
208 if (mddev) mddev_put(mddev); \
209 mddev = list_entry(tmp, mddev_t, all_mddevs); \
210 tmp != &all_mddevs;}); \
211 ({ spin_lock(&all_mddevs_lock); \
216 static int md_fail_request (struct request_queue *q, struct bio *bio)
222 static inline mddev_t *mddev_get(mddev_t *mddev)
224 atomic_inc(&mddev->active);
228 static void mddev_put(mddev_t *mddev)
230 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
232 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
233 list_del(&mddev->all_mddevs);
234 spin_unlock(&all_mddevs_lock);
235 blk_cleanup_queue(mddev->queue);
236 kobject_put(&mddev->kobj);
238 spin_unlock(&all_mddevs_lock);
241 static mddev_t * mddev_find(dev_t unit)
243 mddev_t *mddev, *new = NULL;
246 spin_lock(&all_mddevs_lock);
247 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
248 if (mddev->unit == unit) {
250 spin_unlock(&all_mddevs_lock);
256 list_add(&new->all_mddevs, &all_mddevs);
257 spin_unlock(&all_mddevs_lock);
260 spin_unlock(&all_mddevs_lock);
262 new = kzalloc(sizeof(*new), GFP_KERNEL);
267 if (MAJOR(unit) == MD_MAJOR)
268 new->md_minor = MINOR(unit);
270 new->md_minor = MINOR(unit) >> MdpMinorShift;
272 mutex_init(&new->reconfig_mutex);
273 INIT_LIST_HEAD(&new->disks);
274 INIT_LIST_HEAD(&new->all_mddevs);
275 init_timer(&new->safemode_timer);
276 atomic_set(&new->active, 1);
277 spin_lock_init(&new->write_lock);
278 init_waitqueue_head(&new->sb_wait);
279 init_waitqueue_head(&new->recovery_wait);
280 new->reshape_position = MaxSector;
282 new->resync_max = MaxSector;
283 new->level = LEVEL_NONE;
285 new->queue = blk_alloc_queue(GFP_KERNEL);
290 /* Can be unlocked because the queue is new: no concurrency */
291 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
293 blk_queue_make_request(new->queue, md_fail_request);
298 static inline int mddev_lock(mddev_t * mddev)
300 return mutex_lock_interruptible(&mddev->reconfig_mutex);
303 static inline int mddev_trylock(mddev_t * mddev)
305 return mutex_trylock(&mddev->reconfig_mutex);
308 static inline void mddev_unlock(mddev_t * mddev)
310 mutex_unlock(&mddev->reconfig_mutex);
312 md_wakeup_thread(mddev->thread);
315 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
318 struct list_head *tmp;
320 rdev_for_each(rdev, tmp, mddev) {
321 if (rdev->desc_nr == nr)
327 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
329 struct list_head *tmp;
332 rdev_for_each(rdev, tmp, mddev) {
333 if (rdev->bdev->bd_dev == dev)
339 static struct mdk_personality *find_pers(int level, char *clevel)
341 struct mdk_personality *pers;
342 list_for_each_entry(pers, &pers_list, list) {
343 if (level != LEVEL_NONE && pers->level == level)
345 if (strcmp(pers->name, clevel)==0)
351 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
353 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
354 return MD_NEW_SIZE_BLOCKS(size);
357 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
361 size = rdev->sb_offset;
364 size &= ~((sector_t)chunk_size/1024 - 1);
368 static int alloc_disk_sb(mdk_rdev_t * rdev)
373 rdev->sb_page = alloc_page(GFP_KERNEL);
374 if (!rdev->sb_page) {
375 printk(KERN_ALERT "md: out of memory.\n");
382 static void free_disk_sb(mdk_rdev_t * rdev)
385 put_page(rdev->sb_page);
387 rdev->sb_page = NULL;
394 static void super_written(struct bio *bio, int error)
396 mdk_rdev_t *rdev = bio->bi_private;
397 mddev_t *mddev = rdev->mddev;
399 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
400 printk("md: super_written gets error=%d, uptodate=%d\n",
401 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
402 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
403 md_error(mddev, rdev);
406 if (atomic_dec_and_test(&mddev->pending_writes))
407 wake_up(&mddev->sb_wait);
411 static void super_written_barrier(struct bio *bio, int error)
413 struct bio *bio2 = bio->bi_private;
414 mdk_rdev_t *rdev = bio2->bi_private;
415 mddev_t *mddev = rdev->mddev;
417 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
418 error == -EOPNOTSUPP) {
420 /* barriers don't appear to be supported :-( */
421 set_bit(BarriersNotsupp, &rdev->flags);
422 mddev->barriers_work = 0;
423 spin_lock_irqsave(&mddev->write_lock, flags);
424 bio2->bi_next = mddev->biolist;
425 mddev->biolist = bio2;
426 spin_unlock_irqrestore(&mddev->write_lock, flags);
427 wake_up(&mddev->sb_wait);
431 bio->bi_private = rdev;
432 super_written(bio, error);
436 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
437 sector_t sector, int size, struct page *page)
439 /* write first size bytes of page to sector of rdev
440 * Increment mddev->pending_writes before returning
441 * and decrement it on completion, waking up sb_wait
442 * if zero is reached.
443 * If an error occurred, call md_error
445 * As we might need to resubmit the request if BIO_RW_BARRIER
446 * causes ENOTSUPP, we allocate a spare bio...
448 struct bio *bio = bio_alloc(GFP_NOIO, 1);
449 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
451 bio->bi_bdev = rdev->bdev;
452 bio->bi_sector = sector;
453 bio_add_page(bio, page, size, 0);
454 bio->bi_private = rdev;
455 bio->bi_end_io = super_written;
458 atomic_inc(&mddev->pending_writes);
459 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
461 rw |= (1<<BIO_RW_BARRIER);
462 rbio = bio_clone(bio, GFP_NOIO);
463 rbio->bi_private = bio;
464 rbio->bi_end_io = super_written_barrier;
465 submit_bio(rw, rbio);
470 void md_super_wait(mddev_t *mddev)
472 /* wait for all superblock writes that were scheduled to complete.
473 * if any had to be retried (due to BARRIER problems), retry them
477 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
478 if (atomic_read(&mddev->pending_writes)==0)
480 while (mddev->biolist) {
482 spin_lock_irq(&mddev->write_lock);
483 bio = mddev->biolist;
484 mddev->biolist = bio->bi_next ;
486 spin_unlock_irq(&mddev->write_lock);
487 submit_bio(bio->bi_rw, bio);
491 finish_wait(&mddev->sb_wait, &wq);
494 static void bi_complete(struct bio *bio, int error)
496 complete((struct completion*)bio->bi_private);
499 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
500 struct page *page, int rw)
502 struct bio *bio = bio_alloc(GFP_NOIO, 1);
503 struct completion event;
506 rw |= (1 << BIO_RW_SYNC);
509 bio->bi_sector = sector;
510 bio_add_page(bio, page, size, 0);
511 init_completion(&event);
512 bio->bi_private = &event;
513 bio->bi_end_io = bi_complete;
515 wait_for_completion(&event);
517 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
521 EXPORT_SYMBOL_GPL(sync_page_io);
523 static int read_disk_sb(mdk_rdev_t * rdev, int size)
525 char b[BDEVNAME_SIZE];
526 if (!rdev->sb_page) {
534 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
540 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
541 bdevname(rdev->bdev,b));
545 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
547 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
548 (sb1->set_uuid1 == sb2->set_uuid1) &&
549 (sb1->set_uuid2 == sb2->set_uuid2) &&
550 (sb1->set_uuid3 == sb2->set_uuid3))
558 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
561 mdp_super_t *tmp1, *tmp2;
563 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
564 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
566 if (!tmp1 || !tmp2) {
568 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
576 * nr_disks is not constant
581 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
593 static u32 md_csum_fold(u32 csum)
595 csum = (csum & 0xffff) + (csum >> 16);
596 return (csum & 0xffff) + (csum >> 16);
599 static unsigned int calc_sb_csum(mdp_super_t * sb)
602 u32 *sb32 = (u32*)sb;
604 unsigned int disk_csum, csum;
606 disk_csum = sb->sb_csum;
609 for (i = 0; i < MD_SB_BYTES/4 ; i++)
611 csum = (newcsum & 0xffffffff) + (newcsum>>32);
615 /* This used to use csum_partial, which was wrong for several
616 * reasons including that different results are returned on
617 * different architectures. It isn't critical that we get exactly
618 * the same return value as before (we always csum_fold before
619 * testing, and that removes any differences). However as we
620 * know that csum_partial always returned a 16bit value on
621 * alphas, do a fold to maximise conformity to previous behaviour.
623 sb->sb_csum = md_csum_fold(disk_csum);
625 sb->sb_csum = disk_csum;
632 * Handle superblock details.
633 * We want to be able to handle multiple superblock formats
634 * so we have a common interface to them all, and an array of
635 * different handlers.
636 * We rely on user-space to write the initial superblock, and support
637 * reading and updating of superblocks.
638 * Interface methods are:
639 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
640 * loads and validates a superblock on dev.
641 * if refdev != NULL, compare superblocks on both devices
643 * 0 - dev has a superblock that is compatible with refdev
644 * 1 - dev has a superblock that is compatible and newer than refdev
645 * so dev should be used as the refdev in future
646 * -EINVAL superblock incompatible or invalid
647 * -othererror e.g. -EIO
649 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
650 * Verify that dev is acceptable into mddev.
651 * The first time, mddev->raid_disks will be 0, and data from
652 * dev should be merged in. Subsequent calls check that dev
653 * is new enough. Return 0 or -EINVAL
655 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
656 * Update the superblock for rdev with data in mddev
657 * This does not write to disc.
663 struct module *owner;
664 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
665 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
666 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
670 * load_super for 0.90.0
672 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
674 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
680 * Calculate the position of the superblock,
681 * it's at the end of the disk.
683 * It also happens to be a multiple of 4Kb.
685 sb_offset = calc_dev_sboffset(rdev->bdev);
686 rdev->sb_offset = sb_offset;
688 ret = read_disk_sb(rdev, MD_SB_BYTES);
693 bdevname(rdev->bdev, b);
694 sb = (mdp_super_t*)page_address(rdev->sb_page);
696 if (sb->md_magic != MD_SB_MAGIC) {
697 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
702 if (sb->major_version != 0 ||
703 sb->minor_version < 90 ||
704 sb->minor_version > 91) {
705 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
706 sb->major_version, sb->minor_version,
711 if (sb->raid_disks <= 0)
714 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
715 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
720 rdev->preferred_minor = sb->md_minor;
721 rdev->data_offset = 0;
722 rdev->sb_size = MD_SB_BYTES;
724 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
725 if (sb->level != 1 && sb->level != 4
726 && sb->level != 5 && sb->level != 6
727 && sb->level != 10) {
728 /* FIXME use a better test */
730 "md: bitmaps not supported for this level.\n");
735 if (sb->level == LEVEL_MULTIPATH)
738 rdev->desc_nr = sb->this_disk.number;
744 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
745 if (!uuid_equal(refsb, sb)) {
746 printk(KERN_WARNING "md: %s has different UUID to %s\n",
747 b, bdevname(refdev->bdev,b2));
750 if (!sb_equal(refsb, sb)) {
751 printk(KERN_WARNING "md: %s has same UUID"
752 " but different superblock to %s\n",
753 b, bdevname(refdev->bdev, b2));
757 ev2 = md_event(refsb);
763 rdev->size = calc_dev_size(rdev, sb->chunk_size);
765 if (rdev->size < sb->size && sb->level > 1)
766 /* "this cannot possibly happen" ... */
774 * validate_super for 0.90.0
776 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
779 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
780 __u64 ev1 = md_event(sb);
782 rdev->raid_disk = -1;
783 clear_bit(Faulty, &rdev->flags);
784 clear_bit(In_sync, &rdev->flags);
785 clear_bit(WriteMostly, &rdev->flags);
786 clear_bit(BarriersNotsupp, &rdev->flags);
788 if (mddev->raid_disks == 0) {
789 mddev->major_version = 0;
790 mddev->minor_version = sb->minor_version;
791 mddev->patch_version = sb->patch_version;
793 mddev->chunk_size = sb->chunk_size;
794 mddev->ctime = sb->ctime;
795 mddev->utime = sb->utime;
796 mddev->level = sb->level;
797 mddev->clevel[0] = 0;
798 mddev->layout = sb->layout;
799 mddev->raid_disks = sb->raid_disks;
800 mddev->size = sb->size;
802 mddev->bitmap_offset = 0;
803 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
805 if (mddev->minor_version >= 91) {
806 mddev->reshape_position = sb->reshape_position;
807 mddev->delta_disks = sb->delta_disks;
808 mddev->new_level = sb->new_level;
809 mddev->new_layout = sb->new_layout;
810 mddev->new_chunk = sb->new_chunk;
812 mddev->reshape_position = MaxSector;
813 mddev->delta_disks = 0;
814 mddev->new_level = mddev->level;
815 mddev->new_layout = mddev->layout;
816 mddev->new_chunk = mddev->chunk_size;
819 if (sb->state & (1<<MD_SB_CLEAN))
820 mddev->recovery_cp = MaxSector;
822 if (sb->events_hi == sb->cp_events_hi &&
823 sb->events_lo == sb->cp_events_lo) {
824 mddev->recovery_cp = sb->recovery_cp;
826 mddev->recovery_cp = 0;
829 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
830 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
831 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
832 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
834 mddev->max_disks = MD_SB_DISKS;
836 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
837 mddev->bitmap_file == NULL)
838 mddev->bitmap_offset = mddev->default_bitmap_offset;
840 } else if (mddev->pers == NULL) {
841 /* Insist on good event counter while assembling */
843 if (ev1 < mddev->events)
845 } else if (mddev->bitmap) {
846 /* if adding to array with a bitmap, then we can accept an
847 * older device ... but not too old.
849 if (ev1 < mddev->bitmap->events_cleared)
852 if (ev1 < mddev->events)
853 /* just a hot-add of a new device, leave raid_disk at -1 */
857 if (mddev->level != LEVEL_MULTIPATH) {
858 desc = sb->disks + rdev->desc_nr;
860 if (desc->state & (1<<MD_DISK_FAULTY))
861 set_bit(Faulty, &rdev->flags);
862 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
863 desc->raid_disk < mddev->raid_disks */) {
864 set_bit(In_sync, &rdev->flags);
865 rdev->raid_disk = desc->raid_disk;
867 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
868 set_bit(WriteMostly, &rdev->flags);
869 } else /* MULTIPATH are always insync */
870 set_bit(In_sync, &rdev->flags);
875 * sync_super for 0.90.0
877 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
880 struct list_head *tmp;
882 int next_spare = mddev->raid_disks;
885 /* make rdev->sb match mddev data..
888 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
889 * 3/ any empty disks < next_spare become removed
891 * disks[0] gets initialised to REMOVED because
892 * we cannot be sure from other fields if it has
893 * been initialised or not.
896 int active=0, working=0,failed=0,spare=0,nr_disks=0;
898 rdev->sb_size = MD_SB_BYTES;
900 sb = (mdp_super_t*)page_address(rdev->sb_page);
902 memset(sb, 0, sizeof(*sb));
904 sb->md_magic = MD_SB_MAGIC;
905 sb->major_version = mddev->major_version;
906 sb->patch_version = mddev->patch_version;
907 sb->gvalid_words = 0; /* ignored */
908 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
909 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
910 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
911 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
913 sb->ctime = mddev->ctime;
914 sb->level = mddev->level;
915 sb->size = mddev->size;
916 sb->raid_disks = mddev->raid_disks;
917 sb->md_minor = mddev->md_minor;
918 sb->not_persistent = 0;
919 sb->utime = mddev->utime;
921 sb->events_hi = (mddev->events>>32);
922 sb->events_lo = (u32)mddev->events;
924 if (mddev->reshape_position == MaxSector)
925 sb->minor_version = 90;
927 sb->minor_version = 91;
928 sb->reshape_position = mddev->reshape_position;
929 sb->new_level = mddev->new_level;
930 sb->delta_disks = mddev->delta_disks;
931 sb->new_layout = mddev->new_layout;
932 sb->new_chunk = mddev->new_chunk;
934 mddev->minor_version = sb->minor_version;
937 sb->recovery_cp = mddev->recovery_cp;
938 sb->cp_events_hi = (mddev->events>>32);
939 sb->cp_events_lo = (u32)mddev->events;
940 if (mddev->recovery_cp == MaxSector)
941 sb->state = (1<< MD_SB_CLEAN);
945 sb->layout = mddev->layout;
946 sb->chunk_size = mddev->chunk_size;
948 if (mddev->bitmap && mddev->bitmap_file == NULL)
949 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
951 sb->disks[0].state = (1<<MD_DISK_REMOVED);
952 rdev_for_each(rdev2, tmp, mddev) {
955 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
956 && !test_bit(Faulty, &rdev2->flags))
957 desc_nr = rdev2->raid_disk;
959 desc_nr = next_spare++;
960 rdev2->desc_nr = desc_nr;
961 d = &sb->disks[rdev2->desc_nr];
963 d->number = rdev2->desc_nr;
964 d->major = MAJOR(rdev2->bdev->bd_dev);
965 d->minor = MINOR(rdev2->bdev->bd_dev);
966 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
967 && !test_bit(Faulty, &rdev2->flags))
968 d->raid_disk = rdev2->raid_disk;
970 d->raid_disk = rdev2->desc_nr; /* compatibility */
971 if (test_bit(Faulty, &rdev2->flags))
972 d->state = (1<<MD_DISK_FAULTY);
973 else if (test_bit(In_sync, &rdev2->flags)) {
974 d->state = (1<<MD_DISK_ACTIVE);
975 d->state |= (1<<MD_DISK_SYNC);
983 if (test_bit(WriteMostly, &rdev2->flags))
984 d->state |= (1<<MD_DISK_WRITEMOSTLY);
986 /* now set the "removed" and "faulty" bits on any missing devices */
987 for (i=0 ; i < mddev->raid_disks ; i++) {
988 mdp_disk_t *d = &sb->disks[i];
989 if (d->state == 0 && d->number == 0) {
992 d->state = (1<<MD_DISK_REMOVED);
993 d->state |= (1<<MD_DISK_FAULTY);
997 sb->nr_disks = nr_disks;
998 sb->active_disks = active;
999 sb->working_disks = working;
1000 sb->failed_disks = failed;
1001 sb->spare_disks = spare;
1003 sb->this_disk = sb->disks[rdev->desc_nr];
1004 sb->sb_csum = calc_sb_csum(sb);
1008 * version 1 superblock
1011 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1015 unsigned long long newcsum;
1016 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1017 __le32 *isuper = (__le32*)sb;
1020 disk_csum = sb->sb_csum;
1023 for (i=0; size>=4; size -= 4 )
1024 newcsum += le32_to_cpu(*isuper++);
1027 newcsum += le16_to_cpu(*(__le16*) isuper);
1029 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1030 sb->sb_csum = disk_csum;
1031 return cpu_to_le32(csum);
1034 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1036 struct mdp_superblock_1 *sb;
1039 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1043 * Calculate the position of the superblock.
1044 * It is always aligned to a 4K boundary and
1045 * depeding on minor_version, it can be:
1046 * 0: At least 8K, but less than 12K, from end of device
1047 * 1: At start of device
1048 * 2: 4K from start of device.
1050 switch(minor_version) {
1052 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1054 sb_offset &= ~(sector_t)(4*2-1);
1055 /* convert from sectors to K */
1067 rdev->sb_offset = sb_offset;
1069 /* superblock is rarely larger than 1K, but it can be larger,
1070 * and it is safe to read 4k, so we do that
1072 ret = read_disk_sb(rdev, 4096);
1073 if (ret) return ret;
1076 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1078 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1079 sb->major_version != cpu_to_le32(1) ||
1080 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1081 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1082 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1085 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1086 printk("md: invalid superblock checksum on %s\n",
1087 bdevname(rdev->bdev,b));
1090 if (le64_to_cpu(sb->data_size) < 10) {
1091 printk("md: data_size too small on %s\n",
1092 bdevname(rdev->bdev,b));
1095 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1096 if (sb->level != cpu_to_le32(1) &&
1097 sb->level != cpu_to_le32(4) &&
1098 sb->level != cpu_to_le32(5) &&
1099 sb->level != cpu_to_le32(6) &&
1100 sb->level != cpu_to_le32(10)) {
1102 "md: bitmaps not supported for this level.\n");
1107 rdev->preferred_minor = 0xffff;
1108 rdev->data_offset = le64_to_cpu(sb->data_offset);
1109 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1111 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1112 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1113 if (rdev->sb_size & bmask)
1114 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1117 && rdev->data_offset < sb_offset + (rdev->sb_size/512))
1120 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1123 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1129 struct mdp_superblock_1 *refsb =
1130 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1132 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1133 sb->level != refsb->level ||
1134 sb->layout != refsb->layout ||
1135 sb->chunksize != refsb->chunksize) {
1136 printk(KERN_WARNING "md: %s has strangely different"
1137 " superblock to %s\n",
1138 bdevname(rdev->bdev,b),
1139 bdevname(refdev->bdev,b2));
1142 ev1 = le64_to_cpu(sb->events);
1143 ev2 = le64_to_cpu(refsb->events);
1151 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1153 rdev->size = rdev->sb_offset;
1154 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1156 rdev->size = le64_to_cpu(sb->data_size)/2;
1157 if (le32_to_cpu(sb->chunksize))
1158 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1160 if (le64_to_cpu(sb->size) > rdev->size*2)
1165 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1167 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1168 __u64 ev1 = le64_to_cpu(sb->events);
1170 rdev->raid_disk = -1;
1171 clear_bit(Faulty, &rdev->flags);
1172 clear_bit(In_sync, &rdev->flags);
1173 clear_bit(WriteMostly, &rdev->flags);
1174 clear_bit(BarriersNotsupp, &rdev->flags);
1176 if (mddev->raid_disks == 0) {
1177 mddev->major_version = 1;
1178 mddev->patch_version = 0;
1179 mddev->external = 0;
1180 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1181 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1182 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1183 mddev->level = le32_to_cpu(sb->level);
1184 mddev->clevel[0] = 0;
1185 mddev->layout = le32_to_cpu(sb->layout);
1186 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1187 mddev->size = le64_to_cpu(sb->size)/2;
1188 mddev->events = ev1;
1189 mddev->bitmap_offset = 0;
1190 mddev->default_bitmap_offset = 1024 >> 9;
1192 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1193 memcpy(mddev->uuid, sb->set_uuid, 16);
1195 mddev->max_disks = (4096-256)/2;
1197 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1198 mddev->bitmap_file == NULL )
1199 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1201 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1202 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1203 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1204 mddev->new_level = le32_to_cpu(sb->new_level);
1205 mddev->new_layout = le32_to_cpu(sb->new_layout);
1206 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1208 mddev->reshape_position = MaxSector;
1209 mddev->delta_disks = 0;
1210 mddev->new_level = mddev->level;
1211 mddev->new_layout = mddev->layout;
1212 mddev->new_chunk = mddev->chunk_size;
1215 } else if (mddev->pers == NULL) {
1216 /* Insist of good event counter while assembling */
1218 if (ev1 < mddev->events)
1220 } else if (mddev->bitmap) {
1221 /* If adding to array with a bitmap, then we can accept an
1222 * older device, but not too old.
1224 if (ev1 < mddev->bitmap->events_cleared)
1227 if (ev1 < mddev->events)
1228 /* just a hot-add of a new device, leave raid_disk at -1 */
1231 if (mddev->level != LEVEL_MULTIPATH) {
1233 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1235 case 0xffff: /* spare */
1237 case 0xfffe: /* faulty */
1238 set_bit(Faulty, &rdev->flags);
1241 if ((le32_to_cpu(sb->feature_map) &
1242 MD_FEATURE_RECOVERY_OFFSET))
1243 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1245 set_bit(In_sync, &rdev->flags);
1246 rdev->raid_disk = role;
1249 if (sb->devflags & WriteMostly1)
1250 set_bit(WriteMostly, &rdev->flags);
1251 } else /* MULTIPATH are always insync */
1252 set_bit(In_sync, &rdev->flags);
1257 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1259 struct mdp_superblock_1 *sb;
1260 struct list_head *tmp;
1263 /* make rdev->sb match mddev and rdev data. */
1265 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1267 sb->feature_map = 0;
1269 sb->recovery_offset = cpu_to_le64(0);
1270 memset(sb->pad1, 0, sizeof(sb->pad1));
1271 memset(sb->pad2, 0, sizeof(sb->pad2));
1272 memset(sb->pad3, 0, sizeof(sb->pad3));
1274 sb->utime = cpu_to_le64((__u64)mddev->utime);
1275 sb->events = cpu_to_le64(mddev->events);
1277 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1279 sb->resync_offset = cpu_to_le64(0);
1281 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1283 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1284 sb->size = cpu_to_le64(mddev->size<<1);
1286 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1287 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1288 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1291 if (rdev->raid_disk >= 0 &&
1292 !test_bit(In_sync, &rdev->flags) &&
1293 rdev->recovery_offset > 0) {
1294 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1295 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1298 if (mddev->reshape_position != MaxSector) {
1299 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1300 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1301 sb->new_layout = cpu_to_le32(mddev->new_layout);
1302 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1303 sb->new_level = cpu_to_le32(mddev->new_level);
1304 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1308 rdev_for_each(rdev2, tmp, mddev)
1309 if (rdev2->desc_nr+1 > max_dev)
1310 max_dev = rdev2->desc_nr+1;
1312 if (max_dev > le32_to_cpu(sb->max_dev))
1313 sb->max_dev = cpu_to_le32(max_dev);
1314 for (i=0; i<max_dev;i++)
1315 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1317 rdev_for_each(rdev2, tmp, mddev) {
1319 if (test_bit(Faulty, &rdev2->flags))
1320 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1321 else if (test_bit(In_sync, &rdev2->flags))
1322 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1323 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1324 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1326 sb->dev_roles[i] = cpu_to_le16(0xffff);
1329 sb->sb_csum = calc_sb_1_csum(sb);
1333 static struct super_type super_types[] = {
1336 .owner = THIS_MODULE,
1337 .load_super = super_90_load,
1338 .validate_super = super_90_validate,
1339 .sync_super = super_90_sync,
1343 .owner = THIS_MODULE,
1344 .load_super = super_1_load,
1345 .validate_super = super_1_validate,
1346 .sync_super = super_1_sync,
1350 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1352 struct list_head *tmp, *tmp2;
1353 mdk_rdev_t *rdev, *rdev2;
1355 rdev_for_each(rdev, tmp, mddev1)
1356 rdev_for_each(rdev2, tmp2, mddev2)
1357 if (rdev->bdev->bd_contains ==
1358 rdev2->bdev->bd_contains)
1364 static LIST_HEAD(pending_raid_disks);
1366 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1368 char b[BDEVNAME_SIZE];
1378 /* prevent duplicates */
1379 if (find_rdev(mddev, rdev->bdev->bd_dev))
1382 /* make sure rdev->size exceeds mddev->size */
1383 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1385 /* Cannot change size, so fail
1386 * If mddev->level <= 0, then we don't care
1387 * about aligning sizes (e.g. linear)
1389 if (mddev->level > 0)
1392 mddev->size = rdev->size;
1395 /* Verify rdev->desc_nr is unique.
1396 * If it is -1, assign a free number, else
1397 * check number is not in use
1399 if (rdev->desc_nr < 0) {
1401 if (mddev->pers) choice = mddev->raid_disks;
1402 while (find_rdev_nr(mddev, choice))
1404 rdev->desc_nr = choice;
1406 if (find_rdev_nr(mddev, rdev->desc_nr))
1409 bdevname(rdev->bdev,b);
1410 while ( (s=strchr(b, '/')) != NULL)
1413 rdev->mddev = mddev;
1414 printk(KERN_INFO "md: bind<%s>\n", b);
1416 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1419 if (rdev->bdev->bd_part)
1420 ko = &rdev->bdev->bd_part->dev.kobj;
1422 ko = &rdev->bdev->bd_disk->dev.kobj;
1423 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1424 kobject_del(&rdev->kobj);
1427 list_add(&rdev->same_set, &mddev->disks);
1428 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1432 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1437 static void md_delayed_delete(struct work_struct *ws)
1439 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1440 kobject_del(&rdev->kobj);
1441 kobject_put(&rdev->kobj);
1444 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1446 char b[BDEVNAME_SIZE];
1451 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1452 list_del_init(&rdev->same_set);
1453 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1455 sysfs_remove_link(&rdev->kobj, "block");
1457 /* We need to delay this, otherwise we can deadlock when
1458 * writing to 'remove' to "dev/state"
1460 INIT_WORK(&rdev->del_work, md_delayed_delete);
1461 kobject_get(&rdev->kobj);
1462 schedule_work(&rdev->del_work);
1466 * prevent the device from being mounted, repartitioned or
1467 * otherwise reused by a RAID array (or any other kernel
1468 * subsystem), by bd_claiming the device.
1470 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1473 struct block_device *bdev;
1474 char b[BDEVNAME_SIZE];
1476 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1478 printk(KERN_ERR "md: could not open %s.\n",
1479 __bdevname(dev, b));
1480 return PTR_ERR(bdev);
1482 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1484 printk(KERN_ERR "md: could not bd_claim %s.\n",
1490 set_bit(AllReserved, &rdev->flags);
1495 static void unlock_rdev(mdk_rdev_t *rdev)
1497 struct block_device *bdev = rdev->bdev;
1505 void md_autodetect_dev(dev_t dev);
1507 static void export_rdev(mdk_rdev_t * rdev)
1509 char b[BDEVNAME_SIZE];
1510 printk(KERN_INFO "md: export_rdev(%s)\n",
1511 bdevname(rdev->bdev,b));
1515 list_del_init(&rdev->same_set);
1517 if (test_bit(AutoDetected, &rdev->flags))
1518 md_autodetect_dev(rdev->bdev->bd_dev);
1521 kobject_put(&rdev->kobj);
1524 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1526 unbind_rdev_from_array(rdev);
1530 static void export_array(mddev_t *mddev)
1532 struct list_head *tmp;
1535 rdev_for_each(rdev, tmp, mddev) {
1540 kick_rdev_from_array(rdev);
1542 if (!list_empty(&mddev->disks))
1544 mddev->raid_disks = 0;
1545 mddev->major_version = 0;
1548 static void print_desc(mdp_disk_t *desc)
1550 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1551 desc->major,desc->minor,desc->raid_disk,desc->state);
1554 static void print_sb(mdp_super_t *sb)
1559 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1560 sb->major_version, sb->minor_version, sb->patch_version,
1561 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1563 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1564 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1565 sb->md_minor, sb->layout, sb->chunk_size);
1566 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1567 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1568 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1569 sb->failed_disks, sb->spare_disks,
1570 sb->sb_csum, (unsigned long)sb->events_lo);
1573 for (i = 0; i < MD_SB_DISKS; i++) {
1576 desc = sb->disks + i;
1577 if (desc->number || desc->major || desc->minor ||
1578 desc->raid_disk || (desc->state && (desc->state != 4))) {
1579 printk(" D %2d: ", i);
1583 printk(KERN_INFO "md: THIS: ");
1584 print_desc(&sb->this_disk);
1588 static void print_rdev(mdk_rdev_t *rdev)
1590 char b[BDEVNAME_SIZE];
1591 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1592 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1593 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1595 if (rdev->sb_loaded) {
1596 printk(KERN_INFO "md: rdev superblock:\n");
1597 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1599 printk(KERN_INFO "md: no rdev superblock!\n");
1602 static void md_print_devices(void)
1604 struct list_head *tmp, *tmp2;
1607 char b[BDEVNAME_SIZE];
1610 printk("md: **********************************\n");
1611 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1612 printk("md: **********************************\n");
1613 for_each_mddev(mddev, tmp) {
1616 bitmap_print_sb(mddev->bitmap);
1618 printk("%s: ", mdname(mddev));
1619 rdev_for_each(rdev, tmp2, mddev)
1620 printk("<%s>", bdevname(rdev->bdev,b));
1623 rdev_for_each(rdev, tmp2, mddev)
1626 printk("md: **********************************\n");
1631 static void sync_sbs(mddev_t * mddev, int nospares)
1633 /* Update each superblock (in-memory image), but
1634 * if we are allowed to, skip spares which already
1635 * have the right event counter, or have one earlier
1636 * (which would mean they aren't being marked as dirty
1637 * with the rest of the array)
1640 struct list_head *tmp;
1642 rdev_for_each(rdev, tmp, mddev) {
1643 if (rdev->sb_events == mddev->events ||
1645 rdev->raid_disk < 0 &&
1646 (rdev->sb_events&1)==0 &&
1647 rdev->sb_events+1 == mddev->events)) {
1648 /* Don't update this superblock */
1649 rdev->sb_loaded = 2;
1651 super_types[mddev->major_version].
1652 sync_super(mddev, rdev);
1653 rdev->sb_loaded = 1;
1658 static void md_update_sb(mddev_t * mddev, int force_change)
1660 struct list_head *tmp;
1665 if (mddev->external)
1668 spin_lock_irq(&mddev->write_lock);
1670 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1671 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1673 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1674 /* just a clean<-> dirty transition, possibly leave spares alone,
1675 * though if events isn't the right even/odd, we will have to do
1681 if (mddev->degraded)
1682 /* If the array is degraded, then skipping spares is both
1683 * dangerous and fairly pointless.
1684 * Dangerous because a device that was removed from the array
1685 * might have a event_count that still looks up-to-date,
1686 * so it can be re-added without a resync.
1687 * Pointless because if there are any spares to skip,
1688 * then a recovery will happen and soon that array won't
1689 * be degraded any more and the spare can go back to sleep then.
1693 sync_req = mddev->in_sync;
1694 mddev->utime = get_seconds();
1696 /* If this is just a dirty<->clean transition, and the array is clean
1697 * and 'events' is odd, we can roll back to the previous clean state */
1699 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1700 && (mddev->events & 1)
1701 && mddev->events != 1)
1704 /* otherwise we have to go forward and ... */
1706 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1707 /* .. if the array isn't clean, insist on an odd 'events' */
1708 if ((mddev->events&1)==0) {
1713 /* otherwise insist on an even 'events' (for clean states) */
1714 if ((mddev->events&1)) {
1721 if (!mddev->events) {
1723 * oops, this 64-bit counter should never wrap.
1724 * Either we are in around ~1 trillion A.C., assuming
1725 * 1 reboot per second, or we have a bug:
1732 * do not write anything to disk if using
1733 * nonpersistent superblocks
1735 if (!mddev->persistent) {
1736 if (!mddev->external)
1737 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1739 spin_unlock_irq(&mddev->write_lock);
1740 wake_up(&mddev->sb_wait);
1743 sync_sbs(mddev, nospares);
1744 spin_unlock_irq(&mddev->write_lock);
1747 "md: updating %s RAID superblock on device (in sync %d)\n",
1748 mdname(mddev),mddev->in_sync);
1750 bitmap_update_sb(mddev->bitmap);
1751 rdev_for_each(rdev, tmp, mddev) {
1752 char b[BDEVNAME_SIZE];
1753 dprintk(KERN_INFO "md: ");
1754 if (rdev->sb_loaded != 1)
1755 continue; /* no noise on spare devices */
1756 if (test_bit(Faulty, &rdev->flags))
1757 dprintk("(skipping faulty ");
1759 dprintk("%s ", bdevname(rdev->bdev,b));
1760 if (!test_bit(Faulty, &rdev->flags)) {
1761 md_super_write(mddev,rdev,
1762 rdev->sb_offset<<1, rdev->sb_size,
1764 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1765 bdevname(rdev->bdev,b),
1766 (unsigned long long)rdev->sb_offset);
1767 rdev->sb_events = mddev->events;
1771 if (mddev->level == LEVEL_MULTIPATH)
1772 /* only need to write one superblock... */
1775 md_super_wait(mddev);
1776 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1778 spin_lock_irq(&mddev->write_lock);
1779 if (mddev->in_sync != sync_req ||
1780 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1781 /* have to write it out again */
1782 spin_unlock_irq(&mddev->write_lock);
1785 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1786 spin_unlock_irq(&mddev->write_lock);
1787 wake_up(&mddev->sb_wait);
1791 /* words written to sysfs files may, or my not, be \n terminated.
1792 * We want to accept with case. For this we use cmd_match.
1794 static int cmd_match(const char *cmd, const char *str)
1796 /* See if cmd, written into a sysfs file, matches
1797 * str. They must either be the same, or cmd can
1798 * have a trailing newline
1800 while (*cmd && *str && *cmd == *str) {
1811 struct rdev_sysfs_entry {
1812 struct attribute attr;
1813 ssize_t (*show)(mdk_rdev_t *, char *);
1814 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1818 state_show(mdk_rdev_t *rdev, char *page)
1823 if (test_bit(Faulty, &rdev->flags)) {
1824 len+= sprintf(page+len, "%sfaulty",sep);
1827 if (test_bit(In_sync, &rdev->flags)) {
1828 len += sprintf(page+len, "%sin_sync",sep);
1831 if (test_bit(WriteMostly, &rdev->flags)) {
1832 len += sprintf(page+len, "%swrite_mostly",sep);
1835 if (test_bit(Blocked, &rdev->flags)) {
1836 len += sprintf(page+len, "%sblocked", sep);
1839 if (!test_bit(Faulty, &rdev->flags) &&
1840 !test_bit(In_sync, &rdev->flags)) {
1841 len += sprintf(page+len, "%sspare", sep);
1844 return len+sprintf(page+len, "\n");
1848 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1851 * faulty - simulates and error
1852 * remove - disconnects the device
1853 * writemostly - sets write_mostly
1854 * -writemostly - clears write_mostly
1855 * blocked - sets the Blocked flag
1856 * -blocked - clears the Blocked flag
1859 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1860 md_error(rdev->mddev, rdev);
1862 } else if (cmd_match(buf, "remove")) {
1863 if (rdev->raid_disk >= 0)
1866 mddev_t *mddev = rdev->mddev;
1867 kick_rdev_from_array(rdev);
1869 md_update_sb(mddev, 1);
1870 md_new_event(mddev);
1873 } else if (cmd_match(buf, "writemostly")) {
1874 set_bit(WriteMostly, &rdev->flags);
1876 } else if (cmd_match(buf, "-writemostly")) {
1877 clear_bit(WriteMostly, &rdev->flags);
1879 } else if (cmd_match(buf, "blocked")) {
1880 set_bit(Blocked, &rdev->flags);
1882 } else if (cmd_match(buf, "-blocked")) {
1883 clear_bit(Blocked, &rdev->flags);
1884 wake_up(&rdev->blocked_wait);
1885 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1886 md_wakeup_thread(rdev->mddev->thread);
1890 return err ? err : len;
1892 static struct rdev_sysfs_entry rdev_state =
1893 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1896 errors_show(mdk_rdev_t *rdev, char *page)
1898 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1902 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1905 unsigned long n = simple_strtoul(buf, &e, 10);
1906 if (*buf && (*e == 0 || *e == '\n')) {
1907 atomic_set(&rdev->corrected_errors, n);
1912 static struct rdev_sysfs_entry rdev_errors =
1913 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1916 slot_show(mdk_rdev_t *rdev, char *page)
1918 if (rdev->raid_disk < 0)
1919 return sprintf(page, "none\n");
1921 return sprintf(page, "%d\n", rdev->raid_disk);
1925 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1930 int slot = simple_strtoul(buf, &e, 10);
1931 if (strncmp(buf, "none", 4)==0)
1933 else if (e==buf || (*e && *e!= '\n'))
1935 if (rdev->mddev->pers && slot == -1) {
1936 /* Setting 'slot' on an active array requires also
1937 * updating the 'rd%d' link, and communicating
1938 * with the personality with ->hot_*_disk.
1939 * For now we only support removing
1940 * failed/spare devices. This normally happens automatically,
1941 * but not when the metadata is externally managed.
1943 if (rdev->raid_disk == -1)
1945 /* personality does all needed checks */
1946 if (rdev->mddev->pers->hot_add_disk == NULL)
1948 err = rdev->mddev->pers->
1949 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1952 sprintf(nm, "rd%d", rdev->raid_disk);
1953 sysfs_remove_link(&rdev->mddev->kobj, nm);
1954 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1955 md_wakeup_thread(rdev->mddev->thread);
1956 } else if (rdev->mddev->pers) {
1958 struct list_head *tmp;
1959 /* Activating a spare .. or possibly reactivating
1960 * if we every get bitmaps working here.
1963 if (rdev->raid_disk != -1)
1966 if (rdev->mddev->pers->hot_add_disk == NULL)
1969 rdev_for_each(rdev2, tmp, rdev->mddev)
1970 if (rdev2->raid_disk == slot)
1973 rdev->raid_disk = slot;
1974 if (test_bit(In_sync, &rdev->flags))
1975 rdev->saved_raid_disk = slot;
1977 rdev->saved_raid_disk = -1;
1978 err = rdev->mddev->pers->
1979 hot_add_disk(rdev->mddev, rdev);
1981 rdev->raid_disk = -1;
1986 sprintf(nm, "rd%d", rdev->raid_disk);
1987 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
1989 "md: cannot register "
1991 nm, mdname(rdev->mddev));
1993 /* don't wakeup anyone, leave that to userspace. */
1995 if (slot >= rdev->mddev->raid_disks)
1997 rdev->raid_disk = slot;
1998 /* assume it is working */
1999 clear_bit(Faulty, &rdev->flags);
2000 clear_bit(WriteMostly, &rdev->flags);
2001 set_bit(In_sync, &rdev->flags);
2007 static struct rdev_sysfs_entry rdev_slot =
2008 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2011 offset_show(mdk_rdev_t *rdev, char *page)
2013 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2017 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2020 unsigned long long offset = simple_strtoull(buf, &e, 10);
2021 if (e==buf || (*e && *e != '\n'))
2023 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2025 if (rdev->size && rdev->mddev->external)
2026 /* Must set offset before size, so overlap checks
2029 rdev->data_offset = offset;
2033 static struct rdev_sysfs_entry rdev_offset =
2034 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2037 rdev_size_show(mdk_rdev_t *rdev, char *page)
2039 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2042 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2044 /* check if two start/length pairs overlap */
2053 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2056 unsigned long long size = simple_strtoull(buf, &e, 10);
2057 unsigned long long oldsize = rdev->size;
2058 mddev_t *my_mddev = rdev->mddev;
2060 if (e==buf || (*e && *e != '\n'))
2062 if (my_mddev->pers && rdev->raid_disk >= 0)
2065 if (size > oldsize && rdev->mddev->external) {
2066 /* need to check that all other rdevs with the same ->bdev
2067 * do not overlap. We need to unlock the mddev to avoid
2068 * a deadlock. We have already changed rdev->size, and if
2069 * we have to change it back, we will have the lock again.
2073 struct list_head *tmp, *tmp2;
2075 mddev_unlock(my_mddev);
2076 for_each_mddev(mddev, tmp) {
2080 rdev_for_each(rdev2, tmp2, mddev)
2081 if (test_bit(AllReserved, &rdev2->flags) ||
2082 (rdev->bdev == rdev2->bdev &&
2084 overlaps(rdev->data_offset, rdev->size,
2085 rdev2->data_offset, rdev2->size))) {
2089 mddev_unlock(mddev);
2095 mddev_lock(my_mddev);
2097 /* Someone else could have slipped in a size
2098 * change here, but doing so is just silly.
2099 * We put oldsize back because we *know* it is
2100 * safe, and trust userspace not to race with
2103 rdev->size = oldsize;
2107 if (size < my_mddev->size || my_mddev->size == 0)
2108 my_mddev->size = size;
2112 static struct rdev_sysfs_entry rdev_size =
2113 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2115 static struct attribute *rdev_default_attrs[] = {
2124 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2126 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2127 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2128 mddev_t *mddev = rdev->mddev;
2134 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2136 if (rdev->mddev == NULL)
2139 rv = entry->show(rdev, page);
2140 mddev_unlock(mddev);
2146 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2147 const char *page, size_t length)
2149 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2150 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2152 mddev_t *mddev = rdev->mddev;
2156 if (!capable(CAP_SYS_ADMIN))
2158 rv = mddev ? mddev_lock(mddev): -EBUSY;
2160 if (rdev->mddev == NULL)
2163 rv = entry->store(rdev, page, length);
2164 mddev_unlock(mddev);
2169 static void rdev_free(struct kobject *ko)
2171 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2174 static struct sysfs_ops rdev_sysfs_ops = {
2175 .show = rdev_attr_show,
2176 .store = rdev_attr_store,
2178 static struct kobj_type rdev_ktype = {
2179 .release = rdev_free,
2180 .sysfs_ops = &rdev_sysfs_ops,
2181 .default_attrs = rdev_default_attrs,
2185 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2187 * mark the device faulty if:
2189 * - the device is nonexistent (zero size)
2190 * - the device has no valid superblock
2192 * a faulty rdev _never_ has rdev->sb set.
2194 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2196 char b[BDEVNAME_SIZE];
2201 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2203 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2204 return ERR_PTR(-ENOMEM);
2207 if ((err = alloc_disk_sb(rdev)))
2210 err = lock_rdev(rdev, newdev, super_format == -2);
2214 kobject_init(&rdev->kobj, &rdev_ktype);
2217 rdev->saved_raid_disk = -1;
2218 rdev->raid_disk = -1;
2220 rdev->data_offset = 0;
2221 rdev->sb_events = 0;
2222 atomic_set(&rdev->nr_pending, 0);
2223 atomic_set(&rdev->read_errors, 0);
2224 atomic_set(&rdev->corrected_errors, 0);
2226 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2229 "md: %s has zero or unknown size, marking faulty!\n",
2230 bdevname(rdev->bdev,b));
2235 if (super_format >= 0) {
2236 err = super_types[super_format].
2237 load_super(rdev, NULL, super_minor);
2238 if (err == -EINVAL) {
2240 "md: %s does not have a valid v%d.%d "
2241 "superblock, not importing!\n",
2242 bdevname(rdev->bdev,b),
2243 super_format, super_minor);
2248 "md: could not read %s's sb, not importing!\n",
2249 bdevname(rdev->bdev,b));
2254 INIT_LIST_HEAD(&rdev->same_set);
2255 init_waitqueue_head(&rdev->blocked_wait);
2260 if (rdev->sb_page) {
2266 return ERR_PTR(err);
2270 * Check a full RAID array for plausibility
2274 static void analyze_sbs(mddev_t * mddev)
2277 struct list_head *tmp;
2278 mdk_rdev_t *rdev, *freshest;
2279 char b[BDEVNAME_SIZE];
2282 rdev_for_each(rdev, tmp, mddev)
2283 switch (super_types[mddev->major_version].
2284 load_super(rdev, freshest, mddev->minor_version)) {
2292 "md: fatal superblock inconsistency in %s"
2293 " -- removing from array\n",
2294 bdevname(rdev->bdev,b));
2295 kick_rdev_from_array(rdev);
2299 super_types[mddev->major_version].
2300 validate_super(mddev, freshest);
2303 rdev_for_each(rdev, tmp, mddev) {
2304 if (rdev != freshest)
2305 if (super_types[mddev->major_version].
2306 validate_super(mddev, rdev)) {
2307 printk(KERN_WARNING "md: kicking non-fresh %s"
2309 bdevname(rdev->bdev,b));
2310 kick_rdev_from_array(rdev);
2313 if (mddev->level == LEVEL_MULTIPATH) {
2314 rdev->desc_nr = i++;
2315 rdev->raid_disk = rdev->desc_nr;
2316 set_bit(In_sync, &rdev->flags);
2317 } else if (rdev->raid_disk >= mddev->raid_disks) {
2318 rdev->raid_disk = -1;
2319 clear_bit(In_sync, &rdev->flags);
2325 if (mddev->recovery_cp != MaxSector &&
2327 printk(KERN_ERR "md: %s: raid array is not clean"
2328 " -- starting background reconstruction\n",
2334 safe_delay_show(mddev_t *mddev, char *page)
2336 int msec = (mddev->safemode_delay*1000)/HZ;
2337 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2340 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2348 /* remove a period, and count digits after it */
2349 if (len >= sizeof(buf))
2351 strlcpy(buf, cbuf, len);
2353 for (i=0; i<len; i++) {
2355 if (isdigit(buf[i])) {
2360 } else if (buf[i] == '.') {
2365 msec = simple_strtoul(buf, &e, 10);
2366 if (e == buf || (*e && *e != '\n'))
2368 msec = (msec * 1000) / scale;
2370 mddev->safemode_delay = 0;
2372 mddev->safemode_delay = (msec*HZ)/1000;
2373 if (mddev->safemode_delay == 0)
2374 mddev->safemode_delay = 1;
2378 static struct md_sysfs_entry md_safe_delay =
2379 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2382 level_show(mddev_t *mddev, char *page)
2384 struct mdk_personality *p = mddev->pers;
2386 return sprintf(page, "%s\n", p->name);
2387 else if (mddev->clevel[0])
2388 return sprintf(page, "%s\n", mddev->clevel);
2389 else if (mddev->level != LEVEL_NONE)
2390 return sprintf(page, "%d\n", mddev->level);
2396 level_store(mddev_t *mddev, const char *buf, size_t len)
2403 if (len >= sizeof(mddev->clevel))
2405 strncpy(mddev->clevel, buf, len);
2406 if (mddev->clevel[len-1] == '\n')
2408 mddev->clevel[len] = 0;
2409 mddev->level = LEVEL_NONE;
2413 static struct md_sysfs_entry md_level =
2414 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2418 layout_show(mddev_t *mddev, char *page)
2420 /* just a number, not meaningful for all levels */
2421 if (mddev->reshape_position != MaxSector &&
2422 mddev->layout != mddev->new_layout)
2423 return sprintf(page, "%d (%d)\n",
2424 mddev->new_layout, mddev->layout);
2425 return sprintf(page, "%d\n", mddev->layout);
2429 layout_store(mddev_t *mddev, const char *buf, size_t len)
2432 unsigned long n = simple_strtoul(buf, &e, 10);
2434 if (!*buf || (*e && *e != '\n'))
2439 if (mddev->reshape_position != MaxSector)
2440 mddev->new_layout = n;
2445 static struct md_sysfs_entry md_layout =
2446 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2450 raid_disks_show(mddev_t *mddev, char *page)
2452 if (mddev->raid_disks == 0)
2454 if (mddev->reshape_position != MaxSector &&
2455 mddev->delta_disks != 0)
2456 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2457 mddev->raid_disks - mddev->delta_disks);
2458 return sprintf(page, "%d\n", mddev->raid_disks);
2461 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2464 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2468 unsigned long n = simple_strtoul(buf, &e, 10);
2470 if (!*buf || (*e && *e != '\n'))
2474 rv = update_raid_disks(mddev, n);
2475 else if (mddev->reshape_position != MaxSector) {
2476 int olddisks = mddev->raid_disks - mddev->delta_disks;
2477 mddev->delta_disks = n - olddisks;
2478 mddev->raid_disks = n;
2480 mddev->raid_disks = n;
2481 return rv ? rv : len;
2483 static struct md_sysfs_entry md_raid_disks =
2484 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2487 chunk_size_show(mddev_t *mddev, char *page)
2489 if (mddev->reshape_position != MaxSector &&
2490 mddev->chunk_size != mddev->new_chunk)
2491 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2493 return sprintf(page, "%d\n", mddev->chunk_size);
2497 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2499 /* can only set chunk_size if array is not yet active */
2501 unsigned long n = simple_strtoul(buf, &e, 10);
2503 if (!*buf || (*e && *e != '\n'))
2508 else if (mddev->reshape_position != MaxSector)
2509 mddev->new_chunk = n;
2511 mddev->chunk_size = n;
2514 static struct md_sysfs_entry md_chunk_size =
2515 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2518 resync_start_show(mddev_t *mddev, char *page)
2520 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2524 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2527 unsigned long long n = simple_strtoull(buf, &e, 10);
2531 if (!*buf || (*e && *e != '\n'))
2534 mddev->recovery_cp = n;
2537 static struct md_sysfs_entry md_resync_start =
2538 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2541 * The array state can be:
2544 * No devices, no size, no level
2545 * Equivalent to STOP_ARRAY ioctl
2547 * May have some settings, but array is not active
2548 * all IO results in error
2549 * When written, doesn't tear down array, but just stops it
2550 * suspended (not supported yet)
2551 * All IO requests will block. The array can be reconfigured.
2552 * Writing this, if accepted, will block until array is quiessent
2554 * no resync can happen. no superblocks get written.
2555 * write requests fail
2557 * like readonly, but behaves like 'clean' on a write request.
2559 * clean - no pending writes, but otherwise active.
2560 * When written to inactive array, starts without resync
2561 * If a write request arrives then
2562 * if metadata is known, mark 'dirty' and switch to 'active'.
2563 * if not known, block and switch to write-pending
2564 * If written to an active array that has pending writes, then fails.
2566 * fully active: IO and resync can be happening.
2567 * When written to inactive array, starts with resync
2570 * clean, but writes are blocked waiting for 'active' to be written.
2573 * like active, but no writes have been seen for a while (100msec).
2576 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2577 write_pending, active_idle, bad_word};
2578 static char *array_states[] = {
2579 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2580 "write-pending", "active-idle", NULL };
2582 static int match_word(const char *word, char **list)
2585 for (n=0; list[n]; n++)
2586 if (cmd_match(word, list[n]))
2592 array_state_show(mddev_t *mddev, char *page)
2594 enum array_state st = inactive;
2607 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2609 else if (mddev->safemode)
2615 if (list_empty(&mddev->disks) &&
2616 mddev->raid_disks == 0 &&
2622 return sprintf(page, "%s\n", array_states[st]);
2625 static int do_md_stop(mddev_t * mddev, int ro);
2626 static int do_md_run(mddev_t * mddev);
2627 static int restart_array(mddev_t *mddev);
2630 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2633 enum array_state st = match_word(buf, array_states);
2638 /* stopping an active array */
2639 if (atomic_read(&mddev->active) > 1)
2641 err = do_md_stop(mddev, 0);
2644 /* stopping an active array */
2646 if (atomic_read(&mddev->active) > 1)
2648 err = do_md_stop(mddev, 2);
2650 err = 0; /* already inactive */
2653 break; /* not supported yet */
2656 err = do_md_stop(mddev, 1);
2659 set_disk_ro(mddev->gendisk, 1);
2660 err = do_md_run(mddev);
2666 err = do_md_stop(mddev, 1);
2668 err = restart_array(mddev);
2671 set_disk_ro(mddev->gendisk, 0);
2675 err = do_md_run(mddev);
2680 restart_array(mddev);
2681 spin_lock_irq(&mddev->write_lock);
2682 if (atomic_read(&mddev->writes_pending) == 0) {
2683 if (mddev->in_sync == 0) {
2685 if (mddev->safemode == 1)
2686 mddev->safemode = 0;
2687 if (mddev->persistent)
2688 set_bit(MD_CHANGE_CLEAN,
2694 spin_unlock_irq(&mddev->write_lock);
2697 mddev->recovery_cp = MaxSector;
2698 err = do_md_run(mddev);
2703 restart_array(mddev);
2704 if (mddev->external)
2705 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2706 wake_up(&mddev->sb_wait);
2710 set_disk_ro(mddev->gendisk, 0);
2711 err = do_md_run(mddev);
2716 /* these cannot be set */
2724 static struct md_sysfs_entry md_array_state =
2725 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2728 null_show(mddev_t *mddev, char *page)
2734 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2736 /* buf must be %d:%d\n? giving major and minor numbers */
2737 /* The new device is added to the array.
2738 * If the array has a persistent superblock, we read the
2739 * superblock to initialise info and check validity.
2740 * Otherwise, only checking done is that in bind_rdev_to_array,
2741 * which mainly checks size.
2744 int major = simple_strtoul(buf, &e, 10);
2750 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2752 minor = simple_strtoul(e+1, &e, 10);
2753 if (*e && *e != '\n')
2755 dev = MKDEV(major, minor);
2756 if (major != MAJOR(dev) ||
2757 minor != MINOR(dev))
2761 if (mddev->persistent) {
2762 rdev = md_import_device(dev, mddev->major_version,
2763 mddev->minor_version);
2764 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2765 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2766 mdk_rdev_t, same_set);
2767 err = super_types[mddev->major_version]
2768 .load_super(rdev, rdev0, mddev->minor_version);
2772 } else if (mddev->external)
2773 rdev = md_import_device(dev, -2, -1);
2775 rdev = md_import_device(dev, -1, -1);
2778 return PTR_ERR(rdev);
2779 err = bind_rdev_to_array(rdev, mddev);
2783 return err ? err : len;
2786 static struct md_sysfs_entry md_new_device =
2787 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2790 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2793 unsigned long chunk, end_chunk;
2797 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2799 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2800 if (buf == end) break;
2801 if (*end == '-') { /* range */
2803 end_chunk = simple_strtoul(buf, &end, 0);
2804 if (buf == end) break;
2806 if (*end && !isspace(*end)) break;
2807 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2809 while (isspace(*buf)) buf++;
2811 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2816 static struct md_sysfs_entry md_bitmap =
2817 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2820 size_show(mddev_t *mddev, char *page)
2822 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2825 static int update_size(mddev_t *mddev, unsigned long size);
2828 size_store(mddev_t *mddev, const char *buf, size_t len)
2830 /* If array is inactive, we can reduce the component size, but
2831 * not increase it (except from 0).
2832 * If array is active, we can try an on-line resize
2836 unsigned long long size = simple_strtoull(buf, &e, 10);
2837 if (!*buf || *buf == '\n' ||
2842 err = update_size(mddev, size);
2843 md_update_sb(mddev, 1);
2845 if (mddev->size == 0 ||
2851 return err ? err : len;
2854 static struct md_sysfs_entry md_size =
2855 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2860 * 'none' for arrays with no metadata (good luck...)
2861 * 'external' for arrays with externally managed metadata,
2862 * or N.M for internally known formats
2865 metadata_show(mddev_t *mddev, char *page)
2867 if (mddev->persistent)
2868 return sprintf(page, "%d.%d\n",
2869 mddev->major_version, mddev->minor_version);
2870 else if (mddev->external)
2871 return sprintf(page, "external:%s\n", mddev->metadata_type);
2873 return sprintf(page, "none\n");
2877 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2881 if (!list_empty(&mddev->disks))
2884 if (cmd_match(buf, "none")) {
2885 mddev->persistent = 0;
2886 mddev->external = 0;
2887 mddev->major_version = 0;
2888 mddev->minor_version = 90;
2891 if (strncmp(buf, "external:", 9) == 0) {
2892 size_t namelen = len-9;
2893 if (namelen >= sizeof(mddev->metadata_type))
2894 namelen = sizeof(mddev->metadata_type)-1;
2895 strncpy(mddev->metadata_type, buf+9, namelen);
2896 mddev->metadata_type[namelen] = 0;
2897 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2898 mddev->metadata_type[--namelen] = 0;
2899 mddev->persistent = 0;
2900 mddev->external = 1;
2901 mddev->major_version = 0;
2902 mddev->minor_version = 90;
2905 major = simple_strtoul(buf, &e, 10);
2906 if (e==buf || *e != '.')
2909 minor = simple_strtoul(buf, &e, 10);
2910 if (e==buf || (*e && *e != '\n') )
2912 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2914 mddev->major_version = major;
2915 mddev->minor_version = minor;
2916 mddev->persistent = 1;
2917 mddev->external = 0;
2921 static struct md_sysfs_entry md_metadata =
2922 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2925 action_show(mddev_t *mddev, char *page)
2927 char *type = "idle";
2928 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2929 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2930 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2932 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2933 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2935 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2942 return sprintf(page, "%s\n", type);
2946 action_store(mddev_t *mddev, const char *page, size_t len)
2948 if (!mddev->pers || !mddev->pers->sync_request)
2951 if (cmd_match(page, "idle")) {
2952 if (mddev->sync_thread) {
2953 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2954 md_unregister_thread(mddev->sync_thread);
2955 mddev->sync_thread = NULL;
2956 mddev->recovery = 0;
2958 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2959 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2961 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2962 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2963 else if (cmd_match(page, "reshape")) {
2965 if (mddev->pers->start_reshape == NULL)
2967 err = mddev->pers->start_reshape(mddev);
2971 if (cmd_match(page, "check"))
2972 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2973 else if (!cmd_match(page, "repair"))
2975 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2976 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2978 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2979 md_wakeup_thread(mddev->thread);
2984 mismatch_cnt_show(mddev_t *mddev, char *page)
2986 return sprintf(page, "%llu\n",
2987 (unsigned long long) mddev->resync_mismatches);
2990 static struct md_sysfs_entry md_scan_mode =
2991 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2994 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
2997 sync_min_show(mddev_t *mddev, char *page)
2999 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3000 mddev->sync_speed_min ? "local": "system");
3004 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3008 if (strncmp(buf, "system", 6)==0) {
3009 mddev->sync_speed_min = 0;
3012 min = simple_strtoul(buf, &e, 10);
3013 if (buf == e || (*e && *e != '\n') || min <= 0)
3015 mddev->sync_speed_min = min;
3019 static struct md_sysfs_entry md_sync_min =
3020 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3023 sync_max_show(mddev_t *mddev, char *page)
3025 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3026 mddev->sync_speed_max ? "local": "system");
3030 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3034 if (strncmp(buf, "system", 6)==0) {
3035 mddev->sync_speed_max = 0;
3038 max = simple_strtoul(buf, &e, 10);
3039 if (buf == e || (*e && *e != '\n') || max <= 0)
3041 mddev->sync_speed_max = max;
3045 static struct md_sysfs_entry md_sync_max =
3046 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3049 degraded_show(mddev_t *mddev, char *page)
3051 return sprintf(page, "%d\n", mddev->degraded);
3053 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3056 sync_force_parallel_show(mddev_t *mddev, char *page)
3058 return sprintf(page, "%d\n", mddev->parallel_resync);
3062 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3066 if (strict_strtol(buf, 10, &n))
3069 if (n != 0 && n != 1)
3072 mddev->parallel_resync = n;
3074 if (mddev->sync_thread)
3075 wake_up(&resync_wait);
3080 /* force parallel resync, even with shared block devices */
3081 static struct md_sysfs_entry md_sync_force_parallel =
3082 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3083 sync_force_parallel_show, sync_force_parallel_store);
3086 sync_speed_show(mddev_t *mddev, char *page)
3088 unsigned long resync, dt, db;
3089 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
3090 dt = ((jiffies - mddev->resync_mark) / HZ);
3092 db = resync - (mddev->resync_mark_cnt);
3093 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
3096 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3099 sync_completed_show(mddev_t *mddev, char *page)
3101 unsigned long max_blocks, resync;
3103 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3104 max_blocks = mddev->resync_max_sectors;
3106 max_blocks = mddev->size << 1;
3108 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3109 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3112 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3115 min_sync_show(mddev_t *mddev, char *page)
3117 return sprintf(page, "%llu\n",
3118 (unsigned long long)mddev->resync_min);
3121 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3123 unsigned long long min;
3124 if (strict_strtoull(buf, 10, &min))
3126 if (min > mddev->resync_max)
3128 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3131 /* Must be a multiple of chunk_size */
3132 if (mddev->chunk_size) {
3133 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3136 mddev->resync_min = min;
3141 static struct md_sysfs_entry md_min_sync =
3142 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3145 max_sync_show(mddev_t *mddev, char *page)
3147 if (mddev->resync_max == MaxSector)
3148 return sprintf(page, "max\n");
3150 return sprintf(page, "%llu\n",
3151 (unsigned long long)mddev->resync_max);
3154 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3156 if (strncmp(buf, "max", 3) == 0)
3157 mddev->resync_max = MaxSector;
3159 unsigned long long max;
3160 if (strict_strtoull(buf, 10, &max))
3162 if (max < mddev->resync_min)
3164 if (max < mddev->resync_max &&
3165 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3168 /* Must be a multiple of chunk_size */
3169 if (mddev->chunk_size) {
3170 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3173 mddev->resync_max = max;
3175 wake_up(&mddev->recovery_wait);
3179 static struct md_sysfs_entry md_max_sync =
3180 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3183 suspend_lo_show(mddev_t *mddev, char *page)
3185 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3189 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3192 unsigned long long new = simple_strtoull(buf, &e, 10);
3194 if (mddev->pers->quiesce == NULL)
3196 if (buf == e || (*e && *e != '\n'))
3198 if (new >= mddev->suspend_hi ||
3199 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3200 mddev->suspend_lo = new;
3201 mddev->pers->quiesce(mddev, 2);
3206 static struct md_sysfs_entry md_suspend_lo =
3207 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3211 suspend_hi_show(mddev_t *mddev, char *page)
3213 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3217 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3220 unsigned long long new = simple_strtoull(buf, &e, 10);
3222 if (mddev->pers->quiesce == NULL)
3224 if (buf == e || (*e && *e != '\n'))
3226 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3227 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3228 mddev->suspend_hi = new;
3229 mddev->pers->quiesce(mddev, 1);
3230 mddev->pers->quiesce(mddev, 0);
3235 static struct md_sysfs_entry md_suspend_hi =
3236 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3239 reshape_position_show(mddev_t *mddev, char *page)
3241 if (mddev->reshape_position != MaxSector)
3242 return sprintf(page, "%llu\n",
3243 (unsigned long long)mddev->reshape_position);
3244 strcpy(page, "none\n");
3249 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3252 unsigned long long new = simple_strtoull(buf, &e, 10);
3255 if (buf == e || (*e && *e != '\n'))
3257 mddev->reshape_position = new;
3258 mddev->delta_disks = 0;
3259 mddev->new_level = mddev->level;
3260 mddev->new_layout = mddev->layout;
3261 mddev->new_chunk = mddev->chunk_size;
3265 static struct md_sysfs_entry md_reshape_position =
3266 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3267 reshape_position_store);
3270 static struct attribute *md_default_attrs[] = {
3273 &md_raid_disks.attr,
3274 &md_chunk_size.attr,
3276 &md_resync_start.attr,
3278 &md_new_device.attr,
3279 &md_safe_delay.attr,
3280 &md_array_state.attr,
3281 &md_reshape_position.attr,
3285 static struct attribute *md_redundancy_attrs[] = {
3287 &md_mismatches.attr,
3290 &md_sync_speed.attr,
3291 &md_sync_force_parallel.attr,
3292 &md_sync_completed.attr,
3295 &md_suspend_lo.attr,
3296 &md_suspend_hi.attr,
3301 static struct attribute_group md_redundancy_group = {
3303 .attrs = md_redundancy_attrs,
3308 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3310 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3311 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3316 rv = mddev_lock(mddev);
3318 rv = entry->show(mddev, page);
3319 mddev_unlock(mddev);
3325 md_attr_store(struct kobject *kobj, struct attribute *attr,
3326 const char *page, size_t length)
3328 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3329 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3334 if (!capable(CAP_SYS_ADMIN))
3336 rv = mddev_lock(mddev);
3338 rv = entry->store(mddev, page, length);
3339 mddev_unlock(mddev);
3344 static void md_free(struct kobject *ko)
3346 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3350 static struct sysfs_ops md_sysfs_ops = {
3351 .show = md_attr_show,
3352 .store = md_attr_store,
3354 static struct kobj_type md_ktype = {
3356 .sysfs_ops = &md_sysfs_ops,
3357 .default_attrs = md_default_attrs,
3362 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3364 static DEFINE_MUTEX(disks_mutex);
3365 mddev_t *mddev = mddev_find(dev);
3366 struct gendisk *disk;
3367 int partitioned = (MAJOR(dev) != MD_MAJOR);
3368 int shift = partitioned ? MdpMinorShift : 0;
3369 int unit = MINOR(dev) >> shift;
3375 mutex_lock(&disks_mutex);
3376 if (mddev->gendisk) {
3377 mutex_unlock(&disks_mutex);
3381 disk = alloc_disk(1 << shift);
3383 mutex_unlock(&disks_mutex);
3387 disk->major = MAJOR(dev);
3388 disk->first_minor = unit << shift;
3390 sprintf(disk->disk_name, "md_d%d", unit);
3392 sprintf(disk->disk_name, "md%d", unit);
3393 disk->fops = &md_fops;
3394 disk->private_data = mddev;
3395 disk->queue = mddev->queue;
3397 mddev->gendisk = disk;
3398 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3400 mutex_unlock(&disks_mutex);
3402 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3405 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3409 static void md_safemode_timeout(unsigned long data)
3411 mddev_t *mddev = (mddev_t *) data;
3413 mddev->safemode = 1;
3414 md_wakeup_thread(mddev->thread);
3417 static int start_dirty_degraded;
3419 static int do_md_run(mddev_t * mddev)
3423 struct list_head *tmp;
3425 struct gendisk *disk;
3426 struct mdk_personality *pers;
3427 char b[BDEVNAME_SIZE];
3429 if (list_empty(&mddev->disks))
3430 /* cannot run an array with no devices.. */
3437 * Analyze all RAID superblock(s)
3439 if (!mddev->raid_disks) {
3440 if (!mddev->persistent)
3445 chunk_size = mddev->chunk_size;
3448 if (chunk_size > MAX_CHUNK_SIZE) {
3449 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3450 chunk_size, MAX_CHUNK_SIZE);
3454 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3456 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3457 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3460 if (chunk_size < PAGE_SIZE) {
3461 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3462 chunk_size, PAGE_SIZE);
3466 /* devices must have minimum size of one chunk */
3467 rdev_for_each(rdev, tmp, mddev) {
3468 if (test_bit(Faulty, &rdev->flags))
3470 if (rdev->size < chunk_size / 1024) {
3472 "md: Dev %s smaller than chunk_size:"
3474 bdevname(rdev->bdev,b),
3475 (unsigned long long)rdev->size,
3483 if (mddev->level != LEVEL_NONE)
3484 request_module("md-level-%d", mddev->level);
3485 else if (mddev->clevel[0])
3486 request_module("md-%s", mddev->clevel);
3490 * Drop all container device buffers, from now on
3491 * the only valid external interface is through the md
3494 rdev_for_each(rdev, tmp, mddev) {
3495 if (test_bit(Faulty, &rdev->flags))
3497 sync_blockdev(rdev->bdev);
3498 invalidate_bdev(rdev->bdev);
3500 /* perform some consistency tests on the device.
3501 * We don't want the data to overlap the metadata,
3502 * Internal Bitmap issues has handled elsewhere.
3504 if (rdev->data_offset < rdev->sb_offset) {
3506 rdev->data_offset + mddev->size*2
3507 > rdev->sb_offset*2) {
3508 printk("md: %s: data overlaps metadata\n",
3513 if (rdev->sb_offset*2 + rdev->sb_size/512
3514 > rdev->data_offset) {
3515 printk("md: %s: metadata overlaps data\n",
3522 md_probe(mddev->unit, NULL, NULL);
3523 disk = mddev->gendisk;
3527 spin_lock(&pers_lock);
3528 pers = find_pers(mddev->level, mddev->clevel);
3529 if (!pers || !try_module_get(pers->owner)) {
3530 spin_unlock(&pers_lock);
3531 if (mddev->level != LEVEL_NONE)
3532 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3535 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3540 spin_unlock(&pers_lock);
3541 mddev->level = pers->level;
3542 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3544 if (mddev->reshape_position != MaxSector &&
3545 pers->start_reshape == NULL) {
3546 /* This personality cannot handle reshaping... */
3548 module_put(pers->owner);
3552 if (pers->sync_request) {
3553 /* Warn if this is a potentially silly
3556 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3558 struct list_head *tmp2;
3560 rdev_for_each(rdev, tmp, mddev) {
3561 rdev_for_each(rdev2, tmp2, mddev) {
3563 rdev->bdev->bd_contains ==
3564 rdev2->bdev->bd_contains) {
3566 "%s: WARNING: %s appears to be"
3567 " on the same physical disk as"
3570 bdevname(rdev->bdev,b),
3571 bdevname(rdev2->bdev,b2));
3578 "True protection against single-disk"
3579 " failure might be compromised.\n");
3582 mddev->recovery = 0;
3583 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3584 mddev->barriers_work = 1;
3585 mddev->ok_start_degraded = start_dirty_degraded;
3588 mddev->ro = 2; /* read-only, but switch on first write */
3590 err = mddev->pers->run(mddev);
3591 if (!err && mddev->pers->sync_request) {
3592 err = bitmap_create(mddev);
3594 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3595 mdname(mddev), err);
3596 mddev->pers->stop(mddev);
3600 printk(KERN_ERR "md: pers->run() failed ...\n");
3601 module_put(mddev->pers->owner);
3603 bitmap_destroy(mddev);
3606 if (mddev->pers->sync_request) {
3607 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3609 "md: cannot register extra attributes for %s\n",
3611 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3614 atomic_set(&mddev->writes_pending,0);
3615 mddev->safemode = 0;
3616 mddev->safemode_timer.function = md_safemode_timeout;
3617 mddev->safemode_timer.data = (unsigned long) mddev;
3618 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3621 rdev_for_each(rdev, tmp, mddev)
3622 if (rdev->raid_disk >= 0) {
3624 sprintf(nm, "rd%d", rdev->raid_disk);
3625 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3626 printk("md: cannot register %s for %s\n",
3630 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3633 md_update_sb(mddev, 0);
3635 set_capacity(disk, mddev->array_size<<1);
3637 /* If we call blk_queue_make_request here, it will
3638 * re-initialise max_sectors etc which may have been
3639 * refined inside -> run. So just set the bits we need to set.
3640 * Most initialisation happended when we called
3641 * blk_queue_make_request(..., md_fail_request)
3644 mddev->queue->queuedata = mddev;
3645 mddev->queue->make_request_fn = mddev->pers->make_request;
3647 /* If there is a partially-recovered drive we need to
3648 * start recovery here. If we leave it to md_check_recovery,
3649 * it will remove the drives and not do the right thing
3651 if (mddev->degraded && !mddev->sync_thread) {
3652 struct list_head *rtmp;
3654 rdev_for_each(rdev, rtmp, mddev)
3655 if (rdev->raid_disk >= 0 &&
3656 !test_bit(In_sync, &rdev->flags) &&
3657 !test_bit(Faulty, &rdev->flags))
3658 /* complete an interrupted recovery */
3660 if (spares && mddev->pers->sync_request) {
3661 mddev->recovery = 0;
3662 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3663 mddev->sync_thread = md_register_thread(md_do_sync,
3666 if (!mddev->sync_thread) {
3667 printk(KERN_ERR "%s: could not start resync"
3670 /* leave the spares where they are, it shouldn't hurt */
3671 mddev->recovery = 0;
3675 md_wakeup_thread(mddev->thread);
3676 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3679 md_new_event(mddev);
3680 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
3684 static int restart_array(mddev_t *mddev)
3686 struct gendisk *disk = mddev->gendisk;
3690 * Complain if it has no devices
3693 if (list_empty(&mddev->disks))
3701 mddev->safemode = 0;
3703 set_disk_ro(disk, 0);
3705 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3708 * Kick recovery or resync if necessary
3710 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3711 md_wakeup_thread(mddev->thread);
3712 md_wakeup_thread(mddev->sync_thread);
3721 /* similar to deny_write_access, but accounts for our holding a reference
3722 * to the file ourselves */
3723 static int deny_bitmap_write_access(struct file * file)
3725 struct inode *inode = file->f_mapping->host;
3727 spin_lock(&inode->i_lock);
3728 if (atomic_read(&inode->i_writecount) > 1) {
3729 spin_unlock(&inode->i_lock);
3732 atomic_set(&inode->i_writecount, -1);
3733 spin_unlock(&inode->i_lock);
3738 static void restore_bitmap_write_access(struct file *file)
3740 struct inode *inode = file->f_mapping->host;
3742 spin_lock(&inode->i_lock);
3743 atomic_set(&inode->i_writecount, 1);
3744 spin_unlock(&inode->i_lock);
3748 * 0 - completely stop and dis-assemble array
3749 * 1 - switch to readonly
3750 * 2 - stop but do not disassemble array
3752 static int do_md_stop(mddev_t * mddev, int mode)
3755 struct gendisk *disk = mddev->gendisk;
3758 if (atomic_read(&mddev->active)>2) {
3759 printk("md: %s still in use.\n",mdname(mddev));
3763 if (mddev->sync_thread) {
3764 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3765 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3766 md_unregister_thread(mddev->sync_thread);
3767 mddev->sync_thread = NULL;
3770 del_timer_sync(&mddev->safemode_timer);
3772 invalidate_partition(disk, 0);
3775 case 1: /* readonly */
3781 case 0: /* disassemble */
3783 bitmap_flush(mddev);
3784 md_super_wait(mddev);
3786 set_disk_ro(disk, 0);
3787 blk_queue_make_request(mddev->queue, md_fail_request);
3788 mddev->pers->stop(mddev);
3789 mddev->queue->merge_bvec_fn = NULL;
3790 mddev->queue->unplug_fn = NULL;
3791 mddev->queue->backing_dev_info.congested_fn = NULL;
3792 if (mddev->pers->sync_request)
3793 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3795 module_put(mddev->pers->owner);
3797 /* tell userspace to handle 'inactive' */
3798 sysfs_notify(&mddev->kobj, NULL, "array_state");
3800 set_capacity(disk, 0);
3806 if (!mddev->in_sync || mddev->flags) {
3807 /* mark array as shutdown cleanly */
3809 md_update_sb(mddev, 1);
3812 set_disk_ro(disk, 1);
3813 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3817 * Free resources if final stop
3821 struct list_head *tmp;
3823 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3825 bitmap_destroy(mddev);
3826 if (mddev->bitmap_file) {
3827 restore_bitmap_write_access(mddev->bitmap_file);
3828 fput(mddev->bitmap_file);
3829 mddev->bitmap_file = NULL;
3831 mddev->bitmap_offset = 0;
3833 rdev_for_each(rdev, tmp, mddev)
3834 if (rdev->raid_disk >= 0) {
3836 sprintf(nm, "rd%d", rdev->raid_disk);
3837 sysfs_remove_link(&mddev->kobj, nm);
3840 /* make sure all md_delayed_delete calls have finished */
3841 flush_scheduled_work();
3843 export_array(mddev);
3845 mddev->array_size = 0;
3847 mddev->raid_disks = 0;
3848 mddev->recovery_cp = 0;
3849 mddev->resync_min = 0;
3850 mddev->resync_max = MaxSector;
3851 mddev->reshape_position = MaxSector;
3852 mddev->external = 0;
3853 mddev->persistent = 0;
3854 mddev->level = LEVEL_NONE;
3855 mddev->clevel[0] = 0;
3858 mddev->metadata_type[0] = 0;
3859 mddev->chunk_size = 0;
3860 mddev->ctime = mddev->utime = 0;
3862 mddev->max_disks = 0;
3864 mddev->delta_disks = 0;
3865 mddev->new_level = LEVEL_NONE;
3866 mddev->new_layout = 0;
3867 mddev->new_chunk = 0;
3868 mddev->curr_resync = 0;
3869 mddev->resync_mismatches = 0;
3870 mddev->suspend_lo = mddev->suspend_hi = 0;
3871 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3872 mddev->recovery = 0;
3875 mddev->degraded = 0;
3876 mddev->barriers_work = 0;
3877 mddev->safemode = 0;
3879 } else if (mddev->pers)
3880 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3883 md_new_event(mddev);
3889 static void autorun_array(mddev_t *mddev)
3892 struct list_head *tmp;
3895 if (list_empty(&mddev->disks))
3898 printk(KERN_INFO "md: running: ");
3900 rdev_for_each(rdev, tmp, mddev) {
3901 char b[BDEVNAME_SIZE];
3902 printk("<%s>", bdevname(rdev->bdev,b));
3906 err = do_md_run (mddev);
3908 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3909 do_md_stop (mddev, 0);
3914 * lets try to run arrays based on all disks that have arrived
3915 * until now. (those are in pending_raid_disks)
3917 * the method: pick the first pending disk, collect all disks with
3918 * the same UUID, remove all from the pending list and put them into
3919 * the 'same_array' list. Then order this list based on superblock
3920 * update time (freshest comes first), kick out 'old' disks and
3921 * compare superblocks. If everything's fine then run it.
3923 * If "unit" is allocated, then bump its reference count
3925 static void autorun_devices(int part)
3927 struct list_head *tmp;
3928 mdk_rdev_t *rdev0, *rdev;
3930 char b[BDEVNAME_SIZE];
3932 printk(KERN_INFO "md: autorun ...\n");
3933 while (!list_empty(&pending_raid_disks)) {
3936 LIST_HEAD(candidates);
3937 rdev0 = list_entry(pending_raid_disks.next,
3938 mdk_rdev_t, same_set);
3940 printk(KERN_INFO "md: considering %s ...\n",
3941 bdevname(rdev0->bdev,b));
3942 INIT_LIST_HEAD(&candidates);
3943 rdev_for_each_list(rdev, tmp, pending_raid_disks)
3944 if (super_90_load(rdev, rdev0, 0) >= 0) {
3945 printk(KERN_INFO "md: adding %s ...\n",
3946 bdevname(rdev->bdev,b));
3947 list_move(&rdev->same_set, &candidates);
3950 * now we have a set of devices, with all of them having
3951 * mostly sane superblocks. It's time to allocate the
3955 dev = MKDEV(mdp_major,
3956 rdev0->preferred_minor << MdpMinorShift);
3957 unit = MINOR(dev) >> MdpMinorShift;
3959 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3962 if (rdev0->preferred_minor != unit) {
3963 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3964 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3968 md_probe(dev, NULL, NULL);
3969 mddev = mddev_find(dev);
3970 if (!mddev || !mddev->gendisk) {
3974 "md: cannot allocate memory for md drive.\n");
3977 if (mddev_lock(mddev))
3978 printk(KERN_WARNING "md: %s locked, cannot run\n",
3980 else if (mddev->raid_disks || mddev->major_version
3981 || !list_empty(&mddev->disks)) {
3983 "md: %s already running, cannot run %s\n",
3984 mdname(mddev), bdevname(rdev0->bdev,b));
3985 mddev_unlock(mddev);
3987 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3988 mddev->persistent = 1;
3989 rdev_for_each_list(rdev, tmp, candidates) {
3990 list_del_init(&rdev->same_set);
3991 if (bind_rdev_to_array(rdev, mddev))
3994 autorun_array(mddev);
3995 mddev_unlock(mddev);
3997 /* on success, candidates will be empty, on error
4000 rdev_for_each_list(rdev, tmp, candidates)
4004 printk(KERN_INFO "md: ... autorun DONE.\n");
4006 #endif /* !MODULE */
4008 static int get_version(void __user * arg)
4012 ver.major = MD_MAJOR_VERSION;
4013 ver.minor = MD_MINOR_VERSION;
4014 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4016 if (copy_to_user(arg, &ver, sizeof(ver)))
4022 static int get_array_info(mddev_t * mddev, void __user * arg)
4024 mdu_array_info_t info;
4025 int nr,working,active,failed,spare;
4027 struct list_head *tmp;
4029 nr=working=active=failed=spare=0;
4030 rdev_for_each(rdev, tmp, mddev) {
4032 if (test_bit(Faulty, &rdev->flags))
4036 if (test_bit(In_sync, &rdev->flags))
4043 info.major_version = mddev->major_version;
4044 info.minor_version = mddev->minor_version;
4045 info.patch_version = MD_PATCHLEVEL_VERSION;
4046 info.ctime = mddev->ctime;
4047 info.level = mddev->level;
4048 info.size = mddev->size;
4049 if (info.size != mddev->size) /* overflow */
4052 info.raid_disks = mddev->raid_disks;
4053 info.md_minor = mddev->md_minor;
4054 info.not_persistent= !mddev->persistent;
4056 info.utime = mddev->utime;
4059 info.state = (1<<MD_SB_CLEAN);
4060 if (mddev->bitmap && mddev->bitmap_offset)
4061 info.state = (1<<MD_SB_BITMAP_PRESENT);
4062 info.active_disks = active;
4063 info.working_disks = working;
4064 info.failed_disks = failed;
4065 info.spare_disks = spare;
4067 info.layout = mddev->layout;
4068 info.chunk_size = mddev->chunk_size;
4070 if (copy_to_user(arg, &info, sizeof(info)))
4076 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4078 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4079 char *ptr, *buf = NULL;
4082 md_allow_write(mddev);
4084 file = kmalloc(sizeof(*file), GFP_KERNEL);
4088 /* bitmap disabled, zero the first byte and copy out */
4089 if (!mddev->bitmap || !mddev->bitmap->file) {
4090 file->pathname[0] = '\0';
4094 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4098 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4102 strcpy(file->pathname, ptr);
4106 if (copy_to_user(arg, file, sizeof(*file)))
4114 static int get_disk_info(mddev_t * mddev, void __user * arg)
4116 mdu_disk_info_t info;
4120 if (copy_from_user(&info, arg, sizeof(info)))
4125 rdev = find_rdev_nr(mddev, nr);
4127 info.major = MAJOR(rdev->bdev->bd_dev);
4128 info.minor = MINOR(rdev->bdev->bd_dev);
4129 info.raid_disk = rdev->raid_disk;
4131 if (test_bit(Faulty, &rdev->flags))
4132 info.state |= (1<<MD_DISK_FAULTY);
4133 else if (test_bit(In_sync, &rdev->flags)) {
4134 info.state |= (1<<MD_DISK_ACTIVE);
4135 info.state |= (1<<MD_DISK_SYNC);
4137 if (test_bit(WriteMostly, &rdev->flags))
4138 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4140 info.major = info.minor = 0;
4141 info.raid_disk = -1;
4142 info.state = (1<<MD_DISK_REMOVED);
4145 if (copy_to_user(arg, &info, sizeof(info)))
4151 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4153 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4155 dev_t dev = MKDEV(info->major,info->minor);
4157 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4160 if (!mddev->raid_disks) {
4162 /* expecting a device which has a superblock */
4163 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4166 "md: md_import_device returned %ld\n",
4168 return PTR_ERR(rdev);
4170 if (!list_empty(&mddev->disks)) {
4171 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4172 mdk_rdev_t, same_set);
4173 int err = super_types[mddev->major_version]
4174 .load_super(rdev, rdev0, mddev->minor_version);
4177 "md: %s has different UUID to %s\n",
4178 bdevname(rdev->bdev,b),
4179 bdevname(rdev0->bdev,b2));
4184 err = bind_rdev_to_array(rdev, mddev);
4191 * add_new_disk can be used once the array is assembled
4192 * to add "hot spares". They must already have a superblock
4197 if (!mddev->pers->hot_add_disk) {
4199 "%s: personality does not support diskops!\n",
4203 if (mddev->persistent)
4204 rdev = md_import_device(dev, mddev->major_version,
4205 mddev->minor_version);
4207 rdev = md_import_device(dev, -1, -1);
4210 "md: md_import_device returned %ld\n",
4212 return PTR_ERR(rdev);
4214 /* set save_raid_disk if appropriate */
4215 if (!mddev->persistent) {
4216 if (info->state & (1<<MD_DISK_SYNC) &&
4217 info->raid_disk < mddev->raid_disks)
4218 rdev->raid_disk = info->raid_disk;
4220 rdev->raid_disk = -1;
4222 super_types[mddev->major_version].
4223 validate_super(mddev, rdev);
4224 rdev->saved_raid_disk = rdev->raid_disk;
4226 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4227 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4228 set_bit(WriteMostly, &rdev->flags);
4230 rdev->raid_disk = -1;
4231 err = bind_rdev_to_array(rdev, mddev);
4232 if (!err && !mddev->pers->hot_remove_disk) {
4233 /* If there is hot_add_disk but no hot_remove_disk
4234 * then added disks for geometry changes,
4235 * and should be added immediately.
4237 super_types[mddev->major_version].
4238 validate_super(mddev, rdev);
4239 err = mddev->pers->hot_add_disk(mddev, rdev);
4241 unbind_rdev_from_array(rdev);
4246 md_update_sb(mddev, 1);
4247 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4248 md_wakeup_thread(mddev->thread);
4252 /* otherwise, add_new_disk is only allowed
4253 * for major_version==0 superblocks
4255 if (mddev->major_version != 0) {
4256 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4261 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4263 rdev = md_import_device (dev, -1, 0);
4266 "md: error, md_import_device() returned %ld\n",
4268 return PTR_ERR(rdev);
4270 rdev->desc_nr = info->number;
4271 if (info->raid_disk < mddev->raid_disks)
4272 rdev->raid_disk = info->raid_disk;
4274 rdev->raid_disk = -1;
4276 if (rdev->raid_disk < mddev->raid_disks)
4277 if (info->state & (1<<MD_DISK_SYNC))
4278 set_bit(In_sync, &rdev->flags);
4280 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4281 set_bit(WriteMostly, &rdev->flags);
4283 if (!mddev->persistent) {
4284 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4285 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4287 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4288 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
4290 err = bind_rdev_to_array(rdev, mddev);
4300 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4302 char b[BDEVNAME_SIZE];
4308 rdev = find_rdev(mddev, dev);
4312 if (rdev->raid_disk >= 0)
4315 kick_rdev_from_array(rdev);
4316 md_update_sb(mddev, 1);
4317 md_new_event(mddev);
4321 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4322 bdevname(rdev->bdev,b), mdname(mddev));
4326 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4328 char b[BDEVNAME_SIZE];
4336 if (mddev->major_version != 0) {
4337 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4338 " version-0 superblocks.\n",
4342 if (!mddev->pers->hot_add_disk) {
4344 "%s: personality does not support diskops!\n",
4349 rdev = md_import_device (dev, -1, 0);
4352 "md: error, md_import_device() returned %ld\n",
4357 if (mddev->persistent)
4358 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4361 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4363 size = calc_dev_size(rdev, mddev->chunk_size);
4366 if (test_bit(Faulty, &rdev->flags)) {
4368 "md: can not hot-add faulty %s disk to %s!\n",
4369 bdevname(rdev->bdev,b), mdname(mddev));
4373 clear_bit(In_sync, &rdev->flags);
4375 rdev->saved_raid_disk = -1;
4376 err = bind_rdev_to_array(rdev, mddev);
4381 * The rest should better be atomic, we can have disk failures
4382 * noticed in interrupt contexts ...
4385 if (rdev->desc_nr == mddev->max_disks) {
4386 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4389 goto abort_unbind_export;
4392 rdev->raid_disk = -1;
4394 md_update_sb(mddev, 1);
4397 * Kick recovery, maybe this spare has to be added to the
4398 * array immediately.
4400 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4401 md_wakeup_thread(mddev->thread);
4402 md_new_event(mddev);
4405 abort_unbind_export:
4406 unbind_rdev_from_array(rdev);
4413 static int set_bitmap_file(mddev_t *mddev, int fd)
4418 if (!mddev->pers->quiesce)
4420 if (mddev->recovery || mddev->sync_thread)
4422 /* we should be able to change the bitmap.. */
4428 return -EEXIST; /* cannot add when bitmap is present */
4429 mddev->bitmap_file = fget(fd);
4431 if (mddev->bitmap_file == NULL) {
4432 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4437 err = deny_bitmap_write_access(mddev->bitmap_file);
4439 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4441 fput(mddev->bitmap_file);
4442 mddev->bitmap_file = NULL;
4445 mddev->bitmap_offset = 0; /* file overrides offset */
4446 } else if (mddev->bitmap == NULL)
4447 return -ENOENT; /* cannot remove what isn't there */
4450 mddev->pers->quiesce(mddev, 1);
4452 err = bitmap_create(mddev);
4453 if (fd < 0 || err) {
4454 bitmap_destroy(mddev);
4455 fd = -1; /* make sure to put the file */
4457 mddev->pers->quiesce(mddev, 0);
4460 if (mddev->bitmap_file) {
4461 restore_bitmap_write_access(mddev->bitmap_file);
4462 fput(mddev->bitmap_file);
4464 mddev->bitmap_file = NULL;
4471 * set_array_info is used two different ways
4472 * The original usage is when creating a new array.
4473 * In this usage, raid_disks is > 0 and it together with
4474 * level, size, not_persistent,layout,chunksize determine the
4475 * shape of the array.
4476 * This will always create an array with a type-0.90.0 superblock.
4477 * The newer usage is when assembling an array.
4478 * In this case raid_disks will be 0, and the major_version field is
4479 * use to determine which style super-blocks are to be found on the devices.
4480 * The minor and patch _version numbers are also kept incase the
4481 * super_block handler wishes to interpret them.
4483 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4486 if (info->raid_disks == 0) {
4487 /* just setting version number for superblock loading */
4488 if (info->major_version < 0 ||
4489 info->major_version >= ARRAY_SIZE(super_types) ||
4490 super_types[info->major_version].name == NULL) {
4491 /* maybe try to auto-load a module? */
4493 "md: superblock version %d not known\n",
4494 info->major_version);
4497 mddev->major_version = info->major_version;
4498 mddev->minor_version = info->minor_version;
4499 mddev->patch_version = info->patch_version;
4500 mddev->persistent = !info->not_persistent;
4503 mddev->major_version = MD_MAJOR_VERSION;
4504 mddev->minor_version = MD_MINOR_VERSION;
4505 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4506 mddev->ctime = get_seconds();
4508 mddev->level = info->level;
4509 mddev->clevel[0] = 0;
4510 mddev->size = info->size;
4511 mddev->raid_disks = info->raid_disks;
4512 /* don't set md_minor, it is determined by which /dev/md* was
4515 if (info->state & (1<<MD_SB_CLEAN))
4516 mddev->recovery_cp = MaxSector;
4518 mddev->recovery_cp = 0;
4519 mddev->persistent = ! info->not_persistent;
4520 mddev->external = 0;
4522 mddev->layout = info->layout;
4523 mddev->chunk_size = info->chunk_size;
4525 mddev->max_disks = MD_SB_DISKS;
4527 if (mddev->persistent)
4529 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4531 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4532 mddev->bitmap_offset = 0;
4534 mddev->reshape_position = MaxSector;
4537 * Generate a 128 bit UUID
4539 get_random_bytes(mddev->uuid, 16);
4541 mddev->new_level = mddev->level;
4542 mddev->new_chunk = mddev->chunk_size;
4543 mddev->new_layout = mddev->layout;
4544 mddev->delta_disks = 0;
4549 static int update_size(mddev_t *mddev, unsigned long size)
4553 struct list_head *tmp;
4554 int fit = (size == 0);
4556 if (mddev->pers->resize == NULL)
4558 /* The "size" is the amount of each device that is used.
4559 * This can only make sense for arrays with redundancy.
4560 * linear and raid0 always use whatever space is available
4561 * We can only consider changing the size if no resync
4562 * or reconstruction is happening, and if the new size
4563 * is acceptable. It must fit before the sb_offset or,
4564 * if that is <data_offset, it must fit before the
4565 * size of each device.
4566 * If size is zero, we find the largest size that fits.
4568 if (mddev->sync_thread)
4570 rdev_for_each(rdev, tmp, mddev) {
4572 avail = rdev->size * 2;
4574 if (fit && (size == 0 || size > avail/2))
4576 if (avail < ((sector_t)size << 1))
4579 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4581 struct block_device *bdev;
4583 bdev = bdget_disk(mddev->gendisk, 0);
4585 mutex_lock(&bdev->bd_inode->i_mutex);
4586 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4587 mutex_unlock(&bdev->bd_inode->i_mutex);
4594 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4597 /* change the number of raid disks */
4598 if (mddev->pers->check_reshape == NULL)
4600 if (raid_disks <= 0 ||
4601 raid_disks >= mddev->max_disks)
4603 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4605 mddev->delta_disks = raid_disks - mddev->raid_disks;
4607 rv = mddev->pers->check_reshape(mddev);
4613 * update_array_info is used to change the configuration of an
4615 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4616 * fields in the info are checked against the array.
4617 * Any differences that cannot be handled will cause an error.
4618 * Normally, only one change can be managed at a time.
4620 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4626 /* calculate expected state,ignoring low bits */
4627 if (mddev->bitmap && mddev->bitmap_offset)
4628 state |= (1 << MD_SB_BITMAP_PRESENT);
4630 if (mddev->major_version != info->major_version ||
4631 mddev->minor_version != info->minor_version ||
4632 /* mddev->patch_version != info->patch_version || */
4633 mddev->ctime != info->ctime ||
4634 mddev->level != info->level ||
4635 /* mddev->layout != info->layout || */
4636 !mddev->persistent != info->not_persistent||
4637 mddev->chunk_size != info->chunk_size ||
4638 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4639 ((state^info->state) & 0xfffffe00)
4642 /* Check there is only one change */
4643 if (info->size >= 0 && mddev->size != info->size) cnt++;
4644 if (mddev->raid_disks != info->raid_disks) cnt++;
4645 if (mddev->layout != info->layout) cnt++;
4646 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4647 if (cnt == 0) return 0;
4648 if (cnt > 1) return -EINVAL;
4650 if (mddev->layout != info->layout) {
4652 * we don't need to do anything at the md level, the
4653 * personality will take care of it all.
4655 if (mddev->pers->reconfig == NULL)
4658 return mddev->pers->reconfig(mddev, info->layout, -1);
4660 if (info->size >= 0 && mddev->size != info->size)
4661 rv = update_size(mddev, info->size);
4663 if (mddev->raid_disks != info->raid_disks)
4664 rv = update_raid_disks(mddev, info->raid_disks);
4666 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4667 if (mddev->pers->quiesce == NULL)
4669 if (mddev->recovery || mddev->sync_thread)
4671 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4672 /* add the bitmap */
4675 if (mddev->default_bitmap_offset == 0)
4677 mddev->bitmap_offset = mddev->default_bitmap_offset;
4678 mddev->pers->quiesce(mddev, 1);
4679 rv = bitmap_create(mddev);
4681 bitmap_destroy(mddev);
4682 mddev->pers->quiesce(mddev, 0);
4684 /* remove the bitmap */
4687 if (mddev->bitmap->file)
4689 mddev->pers->quiesce(mddev, 1);
4690 bitmap_destroy(mddev);
4691 mddev->pers->quiesce(mddev, 0);
4692 mddev->bitmap_offset = 0;
4695 md_update_sb(mddev, 1);
4699 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4703 if (mddev->pers == NULL)
4706 rdev = find_rdev(mddev, dev);
4710 md_error(mddev, rdev);
4714 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4716 mddev_t *mddev = bdev->bd_disk->private_data;
4720 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4724 static int md_ioctl(struct inode *inode, struct file *file,
4725 unsigned int cmd, unsigned long arg)
4728 void __user *argp = (void __user *)arg;
4729 mddev_t *mddev = NULL;
4731 if (!capable(CAP_SYS_ADMIN))
4735 * Commands dealing with the RAID driver but not any
4741 err = get_version(argp);
4744 case PRINT_RAID_DEBUG:
4752 autostart_arrays(arg);
4759 * Commands creating/starting a new array:
4762 mddev = inode->i_bdev->bd_disk->private_data;
4769 err = mddev_lock(mddev);
4772 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4779 case SET_ARRAY_INFO:
4781 mdu_array_info_t info;
4783 memset(&info, 0, sizeof(info));
4784 else if (copy_from_user(&info, argp, sizeof(info))) {
4789 err = update_array_info(mddev, &info);
4791 printk(KERN_WARNING "md: couldn't update"
4792 " array info. %d\n", err);
4797 if (!list_empty(&mddev->disks)) {
4799 "md: array %s already has disks!\n",
4804 if (mddev->raid_disks) {
4806 "md: array %s already initialised!\n",
4811 err = set_array_info(mddev, &info);
4813 printk(KERN_WARNING "md: couldn't set"
4814 " array info. %d\n", err);
4824 * Commands querying/configuring an existing array:
4826 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4827 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4828 if ((!mddev->raid_disks && !mddev->external)
4829 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4830 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4831 && cmd != GET_BITMAP_FILE) {
4837 * Commands even a read-only array can execute:
4841 case GET_ARRAY_INFO:
4842 err = get_array_info(mddev, argp);
4845 case GET_BITMAP_FILE:
4846 err = get_bitmap_file(mddev, argp);
4850 err = get_disk_info(mddev, argp);
4853 case RESTART_ARRAY_RW:
4854 err = restart_array(mddev);
4858 err = do_md_stop (mddev, 0);
4862 err = do_md_stop (mddev, 1);
4866 * We have a problem here : there is no easy way to give a CHS
4867 * virtual geometry. We currently pretend that we have a 2 heads
4868 * 4 sectors (with a BIG number of cylinders...). This drives
4869 * dosfs just mad... ;-)
4874 * The remaining ioctls are changing the state of the
4875 * superblock, so we do not allow them on read-only arrays.
4876 * However non-MD ioctls (e.g. get-size) will still come through
4877 * here and hit the 'default' below, so only disallow
4878 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4880 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4881 mddev->ro && mddev->pers) {
4882 if (mddev->ro == 2) {
4884 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4885 md_wakeup_thread(mddev->thread);
4897 mdu_disk_info_t info;
4898 if (copy_from_user(&info, argp, sizeof(info)))
4901 err = add_new_disk(mddev, &info);
4905 case HOT_REMOVE_DISK:
4906 err = hot_remove_disk(mddev, new_decode_dev(arg));
4910 err = hot_add_disk(mddev, new_decode_dev(arg));
4913 case SET_DISK_FAULTY:
4914 err = set_disk_faulty(mddev, new_decode_dev(arg));
4918 err = do_md_run (mddev);
4921 case SET_BITMAP_FILE:
4922 err = set_bitmap_file(mddev, (int)arg);
4932 mddev_unlock(mddev);
4942 static int md_open(struct inode *inode, struct file *file)
4945 * Succeed if we can lock the mddev, which confirms that
4946 * it isn't being stopped right now.
4948 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4951 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
4956 mddev_unlock(mddev);
4958 check_disk_change(inode->i_bdev);
4963 static int md_release(struct inode *inode, struct file * file)
4965 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4973 static int md_media_changed(struct gendisk *disk)
4975 mddev_t *mddev = disk->private_data;
4977 return mddev->changed;
4980 static int md_revalidate(struct gendisk *disk)
4982 mddev_t *mddev = disk->private_data;
4987 static struct block_device_operations md_fops =
4989 .owner = THIS_MODULE,
4991 .release = md_release,
4993 .getgeo = md_getgeo,
4994 .media_changed = md_media_changed,
4995 .revalidate_disk= md_revalidate,
4998 static int md_thread(void * arg)
5000 mdk_thread_t *thread = arg;
5003 * md_thread is a 'system-thread', it's priority should be very
5004 * high. We avoid resource deadlocks individually in each
5005 * raid personality. (RAID5 does preallocation) We also use RR and
5006 * the very same RT priority as kswapd, thus we will never get
5007 * into a priority inversion deadlock.
5009 * we definitely have to have equal or higher priority than
5010 * bdflush, otherwise bdflush will deadlock if there are too
5011 * many dirty RAID5 blocks.
5014 allow_signal(SIGKILL);
5015 while (!kthread_should_stop()) {
5017 /* We need to wait INTERRUPTIBLE so that
5018 * we don't add to the load-average.
5019 * That means we need to be sure no signals are
5022 if (signal_pending(current))
5023 flush_signals(current);
5025 wait_event_interruptible_timeout
5027 test_bit(THREAD_WAKEUP, &thread->flags)
5028 || kthread_should_stop(),
5031 clear_bit(THREAD_WAKEUP, &thread->flags);
5033 thread->run(thread->mddev);
5039 void md_wakeup_thread(mdk_thread_t *thread)
5042 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5043 set_bit(THREAD_WAKEUP, &thread->flags);
5044 wake_up(&thread->wqueue);
5048 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5051 mdk_thread_t *thread;
5053 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5057 init_waitqueue_head(&thread->wqueue);
5060 thread->mddev = mddev;
5061 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5062 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5063 if (IS_ERR(thread->tsk)) {
5070 void md_unregister_thread(mdk_thread_t *thread)
5072 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5074 kthread_stop(thread->tsk);
5078 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5085 if (!rdev || test_bit(Faulty, &rdev->flags))
5088 if (mddev->external)
5089 set_bit(Blocked, &rdev->flags);
5091 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5093 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5094 __builtin_return_address(0),__builtin_return_address(1),
5095 __builtin_return_address(2),__builtin_return_address(3));
5099 if (!mddev->pers->error_handler)
5101 mddev->pers->error_handler(mddev,rdev);
5102 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5103 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5104 md_wakeup_thread(mddev->thread);
5105 md_new_event_inintr(mddev);
5108 /* seq_file implementation /proc/mdstat */
5110 static void status_unused(struct seq_file *seq)
5114 struct list_head *tmp;
5116 seq_printf(seq, "unused devices: ");
5118 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
5119 char b[BDEVNAME_SIZE];
5121 seq_printf(seq, "%s ",
5122 bdevname(rdev->bdev,b));
5125 seq_printf(seq, "<none>");
5127 seq_printf(seq, "\n");
5131 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5133 sector_t max_blocks, resync, res;
5134 unsigned long dt, db, rt;
5136 unsigned int per_milli;
5138 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5140 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5141 max_blocks = mddev->resync_max_sectors >> 1;
5143 max_blocks = mddev->size;
5146 * Should not happen.
5152 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5153 * in a sector_t, and (max_blocks>>scale) will fit in a
5154 * u32, as those are the requirements for sector_div.
5155 * Thus 'scale' must be at least 10
5158 if (sizeof(sector_t) > sizeof(unsigned long)) {
5159 while ( max_blocks/2 > (1ULL<<(scale+32)))
5162 res = (resync>>scale)*1000;
5163 sector_div(res, (u32)((max_blocks>>scale)+1));
5167 int i, x = per_milli/50, y = 20-x;
5168 seq_printf(seq, "[");
5169 for (i = 0; i < x; i++)
5170 seq_printf(seq, "=");
5171 seq_printf(seq, ">");
5172 for (i = 0; i < y; i++)
5173 seq_printf(seq, ".");
5174 seq_printf(seq, "] ");
5176 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5177 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5179 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5181 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5182 "resync" : "recovery"))),
5183 per_milli/10, per_milli % 10,
5184 (unsigned long long) resync,
5185 (unsigned long long) max_blocks);
5188 * We do not want to overflow, so the order of operands and
5189 * the * 100 / 100 trick are important. We do a +1 to be
5190 * safe against division by zero. We only estimate anyway.
5192 * dt: time from mark until now
5193 * db: blocks written from mark until now
5194 * rt: remaining time
5196 dt = ((jiffies - mddev->resync_mark) / HZ);
5198 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5199 - mddev->resync_mark_cnt;
5200 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5202 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5204 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5207 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5209 struct list_head *tmp;
5219 spin_lock(&all_mddevs_lock);
5220 list_for_each(tmp,&all_mddevs)
5222 mddev = list_entry(tmp, mddev_t, all_mddevs);
5224 spin_unlock(&all_mddevs_lock);
5227 spin_unlock(&all_mddevs_lock);
5229 return (void*)2;/* tail */
5233 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5235 struct list_head *tmp;
5236 mddev_t *next_mddev, *mddev = v;
5242 spin_lock(&all_mddevs_lock);
5244 tmp = all_mddevs.next;
5246 tmp = mddev->all_mddevs.next;
5247 if (tmp != &all_mddevs)
5248 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5250 next_mddev = (void*)2;
5253 spin_unlock(&all_mddevs_lock);
5261 static void md_seq_stop(struct seq_file *seq, void *v)
5265 if (mddev && v != (void*)1 && v != (void*)2)
5269 struct mdstat_info {
5273 static int md_seq_show(struct seq_file *seq, void *v)
5277 struct list_head *tmp2;
5279 struct mdstat_info *mi = seq->private;
5280 struct bitmap *bitmap;
5282 if (v == (void*)1) {
5283 struct mdk_personality *pers;
5284 seq_printf(seq, "Personalities : ");
5285 spin_lock(&pers_lock);
5286 list_for_each_entry(pers, &pers_list, list)
5287 seq_printf(seq, "[%s] ", pers->name);
5289 spin_unlock(&pers_lock);
5290 seq_printf(seq, "\n");
5291 mi->event = atomic_read(&md_event_count);
5294 if (v == (void*)2) {
5299 if (mddev_lock(mddev) < 0)
5302 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5303 seq_printf(seq, "%s : %sactive", mdname(mddev),
5304 mddev->pers ? "" : "in");
5307 seq_printf(seq, " (read-only)");
5309 seq_printf(seq, " (auto-read-only)");
5310 seq_printf(seq, " %s", mddev->pers->name);
5314 rdev_for_each(rdev, tmp2, mddev) {
5315 char b[BDEVNAME_SIZE];
5316 seq_printf(seq, " %s[%d]",
5317 bdevname(rdev->bdev,b), rdev->desc_nr);
5318 if (test_bit(WriteMostly, &rdev->flags))
5319 seq_printf(seq, "(W)");
5320 if (test_bit(Faulty, &rdev->flags)) {
5321 seq_printf(seq, "(F)");
5323 } else if (rdev->raid_disk < 0)
5324 seq_printf(seq, "(S)"); /* spare */
5328 if (!list_empty(&mddev->disks)) {
5330 seq_printf(seq, "\n %llu blocks",
5331 (unsigned long long)mddev->array_size);
5333 seq_printf(seq, "\n %llu blocks",
5334 (unsigned long long)size);
5336 if (mddev->persistent) {
5337 if (mddev->major_version != 0 ||
5338 mddev->minor_version != 90) {
5339 seq_printf(seq," super %d.%d",
5340 mddev->major_version,
5341 mddev->minor_version);
5343 } else if (mddev->external)
5344 seq_printf(seq, " super external:%s",
5345 mddev->metadata_type);
5347 seq_printf(seq, " super non-persistent");
5350 mddev->pers->status (seq, mddev);
5351 seq_printf(seq, "\n ");
5352 if (mddev->pers->sync_request) {
5353 if (mddev->curr_resync > 2) {
5354 status_resync (seq, mddev);
5355 seq_printf(seq, "\n ");
5356 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5357 seq_printf(seq, "\tresync=DELAYED\n ");
5358 else if (mddev->recovery_cp < MaxSector)
5359 seq_printf(seq, "\tresync=PENDING\n ");
5362 seq_printf(seq, "\n ");
5364 if ((bitmap = mddev->bitmap)) {
5365 unsigned long chunk_kb;
5366 unsigned long flags;
5367 spin_lock_irqsave(&bitmap->lock, flags);
5368 chunk_kb = bitmap->chunksize >> 10;
5369 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5371 bitmap->pages - bitmap->missing_pages,
5373 (bitmap->pages - bitmap->missing_pages)
5374 << (PAGE_SHIFT - 10),
5375 chunk_kb ? chunk_kb : bitmap->chunksize,
5376 chunk_kb ? "KB" : "B");
5378 seq_printf(seq, ", file: ");
5379 seq_path(seq, &bitmap->file->f_path, " \t\n");
5382 seq_printf(seq, "\n");
5383 spin_unlock_irqrestore(&bitmap->lock, flags);
5386 seq_printf(seq, "\n");
5388 mddev_unlock(mddev);
5393 static struct seq_operations md_seq_ops = {
5394 .start = md_seq_start,
5395 .next = md_seq_next,
5396 .stop = md_seq_stop,
5397 .show = md_seq_show,
5400 static int md_seq_open(struct inode *inode, struct file *file)
5403 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5407 error = seq_open(file, &md_seq_ops);
5411 struct seq_file *p = file->private_data;
5413 mi->event = atomic_read(&md_event_count);
5418 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5420 struct seq_file *m = filp->private_data;
5421 struct mdstat_info *mi = m->private;
5424 poll_wait(filp, &md_event_waiters, wait);
5426 /* always allow read */
5427 mask = POLLIN | POLLRDNORM;
5429 if (mi->event != atomic_read(&md_event_count))
5430 mask |= POLLERR | POLLPRI;
5434 static const struct file_operations md_seq_fops = {
5435 .owner = THIS_MODULE,
5436 .open = md_seq_open,
5438 .llseek = seq_lseek,
5439 .release = seq_release_private,
5440 .poll = mdstat_poll,
5443 int register_md_personality(struct mdk_personality *p)
5445 spin_lock(&pers_lock);
5446 list_add_tail(&p->list, &pers_list);
5447 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5448 spin_unlock(&pers_lock);
5452 int unregister_md_personality(struct mdk_personality *p)
5454 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5455 spin_lock(&pers_lock);
5456 list_del_init(&p->list);
5457 spin_unlock(&pers_lock);
5461 static int is_mddev_idle(mddev_t *mddev)
5464 struct list_head *tmp;
5469 rdev_for_each(rdev, tmp, mddev) {
5470 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5471 curr_events = disk_stat_read(disk, sectors[0]) +
5472 disk_stat_read(disk, sectors[1]) -
5473 atomic_read(&disk->sync_io);
5474 /* sync IO will cause sync_io to increase before the disk_stats
5475 * as sync_io is counted when a request starts, and
5476 * disk_stats is counted when it completes.
5477 * So resync activity will cause curr_events to be smaller than
5478 * when there was no such activity.
5479 * non-sync IO will cause disk_stat to increase without
5480 * increasing sync_io so curr_events will (eventually)
5481 * be larger than it was before. Once it becomes
5482 * substantially larger, the test below will cause
5483 * the array to appear non-idle, and resync will slow
5485 * If there is a lot of outstanding resync activity when
5486 * we set last_event to curr_events, then all that activity
5487 * completing might cause the array to appear non-idle
5488 * and resync will be slowed down even though there might
5489 * not have been non-resync activity. This will only
5490 * happen once though. 'last_events' will soon reflect
5491 * the state where there is little or no outstanding
5492 * resync requests, and further resync activity will
5493 * always make curr_events less than last_events.
5496 if (curr_events - rdev->last_events > 4096) {
5497 rdev->last_events = curr_events;
5504 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5506 /* another "blocks" (512byte) blocks have been synced */
5507 atomic_sub(blocks, &mddev->recovery_active);
5508 wake_up(&mddev->recovery_wait);
5510 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5511 md_wakeup_thread(mddev->thread);
5512 // stop recovery, signal do_sync ....
5517 /* md_write_start(mddev, bi)
5518 * If we need to update some array metadata (e.g. 'active' flag
5519 * in superblock) before writing, schedule a superblock update
5520 * and wait for it to complete.
5522 void md_write_start(mddev_t *mddev, struct bio *bi)
5524 if (bio_data_dir(bi) != WRITE)
5527 BUG_ON(mddev->ro == 1);
5528 if (mddev->ro == 2) {
5529 /* need to switch to read/write */
5531 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5532 md_wakeup_thread(mddev->thread);
5533 md_wakeup_thread(mddev->sync_thread);
5535 atomic_inc(&mddev->writes_pending);
5536 if (mddev->safemode == 1)
5537 mddev->safemode = 0;
5538 if (mddev->in_sync) {
5539 spin_lock_irq(&mddev->write_lock);
5540 if (mddev->in_sync) {
5542 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5543 md_wakeup_thread(mddev->thread);
5545 spin_unlock_irq(&mddev->write_lock);
5546 sysfs_notify(&mddev->kobj, NULL, "array_state");
5548 wait_event(mddev->sb_wait,
5549 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5550 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5553 void md_write_end(mddev_t *mddev)
5555 if (atomic_dec_and_test(&mddev->writes_pending)) {
5556 if (mddev->safemode == 2)
5557 md_wakeup_thread(mddev->thread);
5558 else if (mddev->safemode_delay)
5559 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5563 /* md_allow_write(mddev)
5564 * Calling this ensures that the array is marked 'active' so that writes
5565 * may proceed without blocking. It is important to call this before
5566 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5567 * Must be called with mddev_lock held.
5569 void md_allow_write(mddev_t *mddev)
5575 if (!mddev->pers->sync_request)
5578 spin_lock_irq(&mddev->write_lock);
5579 if (mddev->in_sync) {
5581 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5582 if (mddev->safemode_delay &&
5583 mddev->safemode == 0)
5584 mddev->safemode = 1;
5585 spin_unlock_irq(&mddev->write_lock);
5586 md_update_sb(mddev, 0);
5588 sysfs_notify(&mddev->kobj, NULL, "array_state");
5589 /* wait for the dirty state to be recorded in the metadata */
5590 wait_event(mddev->sb_wait,
5591 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5592 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5594 spin_unlock_irq(&mddev->write_lock);
5596 EXPORT_SYMBOL_GPL(md_allow_write);
5598 #define SYNC_MARKS 10
5599 #define SYNC_MARK_STEP (3*HZ)
5600 void md_do_sync(mddev_t *mddev)
5603 unsigned int currspeed = 0,
5605 sector_t max_sectors,j, io_sectors;
5606 unsigned long mark[SYNC_MARKS];
5607 sector_t mark_cnt[SYNC_MARKS];
5609 struct list_head *tmp;
5610 sector_t last_check;
5612 struct list_head *rtmp;
5616 /* just incase thread restarts... */
5617 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5619 if (mddev->ro) /* never try to sync a read-only array */
5622 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5623 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5624 desc = "data-check";
5625 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5626 desc = "requested-resync";
5629 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5634 /* we overload curr_resync somewhat here.
5635 * 0 == not engaged in resync at all
5636 * 2 == checking that there is no conflict with another sync
5637 * 1 == like 2, but have yielded to allow conflicting resync to
5639 * other == active in resync - this many blocks
5641 * Before starting a resync we must have set curr_resync to
5642 * 2, and then checked that every "conflicting" array has curr_resync
5643 * less than ours. When we find one that is the same or higher
5644 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5645 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5646 * This will mean we have to start checking from the beginning again.
5651 mddev->curr_resync = 2;
5654 if (kthread_should_stop()) {
5655 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5658 for_each_mddev(mddev2, tmp) {
5659 if (mddev2 == mddev)
5661 if (!mddev->parallel_resync
5662 && mddev2->curr_resync
5663 && match_mddev_units(mddev, mddev2)) {
5665 if (mddev < mddev2 && mddev->curr_resync == 2) {
5666 /* arbitrarily yield */
5667 mddev->curr_resync = 1;
5668 wake_up(&resync_wait);
5670 if (mddev > mddev2 && mddev->curr_resync == 1)
5671 /* no need to wait here, we can wait the next
5672 * time 'round when curr_resync == 2
5675 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5676 if (!kthread_should_stop() &&
5677 mddev2->curr_resync >= mddev->curr_resync) {
5678 printk(KERN_INFO "md: delaying %s of %s"
5679 " until %s has finished (they"
5680 " share one or more physical units)\n",
5681 desc, mdname(mddev), mdname(mddev2));
5684 finish_wait(&resync_wait, &wq);
5687 finish_wait(&resync_wait, &wq);
5690 } while (mddev->curr_resync < 2);
5693 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5694 /* resync follows the size requested by the personality,
5695 * which defaults to physical size, but can be virtual size
5697 max_sectors = mddev->resync_max_sectors;
5698 mddev->resync_mismatches = 0;
5699 /* we don't use the checkpoint if there's a bitmap */
5700 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5701 j = mddev->resync_min;
5702 else if (!mddev->bitmap)
5703 j = mddev->recovery_cp;
5705 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5706 max_sectors = mddev->size << 1;
5708 /* recovery follows the physical size of devices */
5709 max_sectors = mddev->size << 1;
5711 rdev_for_each(rdev, rtmp, mddev)
5712 if (rdev->raid_disk >= 0 &&
5713 !test_bit(Faulty, &rdev->flags) &&
5714 !test_bit(In_sync, &rdev->flags) &&
5715 rdev->recovery_offset < j)
5716 j = rdev->recovery_offset;
5719 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5720 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5721 " %d KB/sec/disk.\n", speed_min(mddev));
5722 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5723 "(but not more than %d KB/sec) for %s.\n",
5724 speed_max(mddev), desc);
5726 is_mddev_idle(mddev); /* this also initializes IO event counters */
5729 for (m = 0; m < SYNC_MARKS; m++) {
5731 mark_cnt[m] = io_sectors;
5734 mddev->resync_mark = mark[last_mark];
5735 mddev->resync_mark_cnt = mark_cnt[last_mark];
5738 * Tune reconstruction:
5740 window = 32*(PAGE_SIZE/512);
5741 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5742 window/2,(unsigned long long) max_sectors/2);
5744 atomic_set(&mddev->recovery_active, 0);
5749 "md: resuming %s of %s from checkpoint.\n",
5750 desc, mdname(mddev));
5751 mddev->curr_resync = j;
5754 while (j < max_sectors) {
5758 if (j >= mddev->resync_max) {
5759 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5760 wait_event(mddev->recovery_wait,
5761 mddev->resync_max > j
5762 || kthread_should_stop());
5764 if (kthread_should_stop())
5766 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5767 currspeed < speed_min(mddev));
5769 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5773 if (!skipped) { /* actual IO requested */
5774 io_sectors += sectors;
5775 atomic_add(sectors, &mddev->recovery_active);
5779 if (j>1) mddev->curr_resync = j;
5780 mddev->curr_mark_cnt = io_sectors;
5781 if (last_check == 0)
5782 /* this is the earliers that rebuilt will be
5783 * visible in /proc/mdstat
5785 md_new_event(mddev);
5787 if (last_check + window > io_sectors || j == max_sectors)
5790 last_check = io_sectors;
5792 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5796 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5798 int next = (last_mark+1) % SYNC_MARKS;
5800 mddev->resync_mark = mark[next];
5801 mddev->resync_mark_cnt = mark_cnt[next];
5802 mark[next] = jiffies;
5803 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5808 if (kthread_should_stop())
5813 * this loop exits only if either when we are slower than
5814 * the 'hard' speed limit, or the system was IO-idle for
5816 * the system might be non-idle CPU-wise, but we only care
5817 * about not overloading the IO subsystem. (things like an
5818 * e2fsck being done on the RAID array should execute fast)
5820 blk_unplug(mddev->queue);
5823 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5824 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5826 if (currspeed > speed_min(mddev)) {
5827 if ((currspeed > speed_max(mddev)) ||
5828 !is_mddev_idle(mddev)) {
5834 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5836 * this also signals 'finished resyncing' to md_stop
5839 blk_unplug(mddev->queue);
5841 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5843 /* tell personality that we are finished */
5844 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5846 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5847 mddev->curr_resync > 2) {
5848 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5849 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5850 if (mddev->curr_resync >= mddev->recovery_cp) {
5852 "md: checkpointing %s of %s.\n",
5853 desc, mdname(mddev));
5854 mddev->recovery_cp = mddev->curr_resync;
5857 mddev->recovery_cp = MaxSector;
5859 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5860 mddev->curr_resync = MaxSector;
5861 rdev_for_each(rdev, rtmp, mddev)
5862 if (rdev->raid_disk >= 0 &&
5863 !test_bit(Faulty, &rdev->flags) &&
5864 !test_bit(In_sync, &rdev->flags) &&
5865 rdev->recovery_offset < mddev->curr_resync)
5866 rdev->recovery_offset = mddev->curr_resync;
5869 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5872 mddev->curr_resync = 0;
5873 mddev->resync_min = 0;
5874 mddev->resync_max = MaxSector;
5875 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5876 wake_up(&resync_wait);
5877 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5878 md_wakeup_thread(mddev->thread);
5883 * got a signal, exit.
5886 "md: md_do_sync() got signal ... exiting\n");
5887 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5891 EXPORT_SYMBOL_GPL(md_do_sync);
5894 static int remove_and_add_spares(mddev_t *mddev)
5897 struct list_head *rtmp;
5900 rdev_for_each(rdev, rtmp, mddev)
5901 if (rdev->raid_disk >= 0 &&
5902 !test_bit(Blocked, &rdev->flags) &&
5903 (test_bit(Faulty, &rdev->flags) ||
5904 ! test_bit(In_sync, &rdev->flags)) &&
5905 atomic_read(&rdev->nr_pending)==0) {
5906 if (mddev->pers->hot_remove_disk(
5907 mddev, rdev->raid_disk)==0) {
5909 sprintf(nm,"rd%d", rdev->raid_disk);
5910 sysfs_remove_link(&mddev->kobj, nm);
5911 rdev->raid_disk = -1;
5915 if (mddev->degraded) {
5916 rdev_for_each(rdev, rtmp, mddev) {
5917 if (rdev->raid_disk >= 0 &&
5918 !test_bit(In_sync, &rdev->flags))
5920 if (rdev->raid_disk < 0
5921 && !test_bit(Faulty, &rdev->flags)) {
5922 rdev->recovery_offset = 0;
5923 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5925 sprintf(nm, "rd%d", rdev->raid_disk);
5926 if (sysfs_create_link(&mddev->kobj,
5929 "md: cannot register "
5933 md_new_event(mddev);
5942 * This routine is regularly called by all per-raid-array threads to
5943 * deal with generic issues like resync and super-block update.
5944 * Raid personalities that don't have a thread (linear/raid0) do not
5945 * need this as they never do any recovery or update the superblock.
5947 * It does not do any resync itself, but rather "forks" off other threads
5948 * to do that as needed.
5949 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5950 * "->recovery" and create a thread at ->sync_thread.
5951 * When the thread finishes it sets MD_RECOVERY_DONE
5952 * and wakeups up this thread which will reap the thread and finish up.
5953 * This thread also removes any faulty devices (with nr_pending == 0).
5955 * The overall approach is:
5956 * 1/ if the superblock needs updating, update it.
5957 * 2/ If a recovery thread is running, don't do anything else.
5958 * 3/ If recovery has finished, clean up, possibly marking spares active.
5959 * 4/ If there are any faulty devices, remove them.
5960 * 5/ If array is degraded, try to add spares devices
5961 * 6/ If array has spares or is not in-sync, start a resync thread.
5963 void md_check_recovery(mddev_t *mddev)
5966 struct list_head *rtmp;
5970 bitmap_daemon_work(mddev->bitmap);
5975 if (signal_pending(current)) {
5976 if (mddev->pers->sync_request && !mddev->external) {
5977 printk(KERN_INFO "md: %s in immediate safe mode\n",
5979 mddev->safemode = 2;
5981 flush_signals(current);
5985 (mddev->flags && !mddev->external) ||
5986 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5987 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5988 (mddev->external == 0 && mddev->safemode == 1) ||
5989 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5990 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5994 if (mddev_trylock(mddev)) {
5997 if (!mddev->external) {
5998 spin_lock_irq(&mddev->write_lock);
5999 if (mddev->safemode &&
6000 !atomic_read(&mddev->writes_pending) &&
6002 mddev->recovery_cp == MaxSector) {
6004 if (mddev->persistent)
6005 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6007 if (mddev->safemode == 1)
6008 mddev->safemode = 0;
6009 spin_unlock_irq(&mddev->write_lock);
6013 md_update_sb(mddev, 0);
6016 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6017 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6018 /* resync/recovery still happening */
6019 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6022 if (mddev->sync_thread) {
6023 /* resync has finished, collect result */
6024 md_unregister_thread(mddev->sync_thread);
6025 mddev->sync_thread = NULL;
6026 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6028 /* activate any spares */
6029 mddev->pers->spare_active(mddev);
6031 md_update_sb(mddev, 1);
6033 /* if array is no-longer degraded, then any saved_raid_disk
6034 * information must be scrapped
6036 if (!mddev->degraded)
6037 rdev_for_each(rdev, rtmp, mddev)
6038 rdev->saved_raid_disk = -1;
6040 mddev->recovery = 0;
6041 /* flag recovery needed just to double check */
6042 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6043 md_new_event(mddev);
6046 /* Clear some bits that don't mean anything, but
6049 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6050 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6051 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6053 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6055 /* no recovery is running.
6056 * remove any failed drives, then
6057 * add spares if possible.
6058 * Spare are also removed and re-added, to allow
6059 * the personality to fail the re-add.
6062 if (mddev->reshape_position != MaxSector) {
6063 if (mddev->pers->check_reshape(mddev) != 0)
6064 /* Cannot proceed */
6066 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6067 } else if ((spares = remove_and_add_spares(mddev))) {
6068 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6069 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6070 } else if (mddev->recovery_cp < MaxSector) {
6071 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6072 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6073 /* nothing to be done ... */
6076 if (mddev->pers->sync_request) {
6077 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6078 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6079 /* We are adding a device or devices to an array
6080 * which has the bitmap stored on all devices.
6081 * So make sure all bitmap pages get written
6083 bitmap_write_all(mddev->bitmap);
6085 mddev->sync_thread = md_register_thread(md_do_sync,
6088 if (!mddev->sync_thread) {
6089 printk(KERN_ERR "%s: could not start resync"
6092 /* leave the spares where they are, it shouldn't hurt */
6093 mddev->recovery = 0;
6095 md_wakeup_thread(mddev->sync_thread);
6096 md_new_event(mddev);
6099 mddev_unlock(mddev);
6103 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6105 sysfs_notify(&rdev->kobj, NULL, "state");
6106 wait_event_timeout(rdev->blocked_wait,
6107 !test_bit(Blocked, &rdev->flags),
6108 msecs_to_jiffies(5000));
6109 rdev_dec_pending(rdev, mddev);
6111 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6113 static int md_notify_reboot(struct notifier_block *this,
6114 unsigned long code, void *x)
6116 struct list_head *tmp;
6119 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6121 printk(KERN_INFO "md: stopping all md devices.\n");
6123 for_each_mddev(mddev, tmp)
6124 if (mddev_trylock(mddev)) {
6125 do_md_stop (mddev, 1);
6126 mddev_unlock(mddev);
6129 * certain more exotic SCSI devices are known to be
6130 * volatile wrt too early system reboots. While the
6131 * right place to handle this issue is the given
6132 * driver, we do want to have a safe RAID driver ...
6139 static struct notifier_block md_notifier = {
6140 .notifier_call = md_notify_reboot,
6142 .priority = INT_MAX, /* before any real devices */
6145 static void md_geninit(void)
6147 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6149 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6152 static int __init md_init(void)
6154 if (register_blkdev(MAJOR_NR, "md"))
6156 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6157 unregister_blkdev(MAJOR_NR, "md");
6160 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6161 md_probe, NULL, NULL);
6162 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6163 md_probe, NULL, NULL);
6165 register_reboot_notifier(&md_notifier);
6166 raid_table_header = register_sysctl_table(raid_root_table);
6176 * Searches all registered partitions for autorun RAID arrays
6180 static LIST_HEAD(all_detected_devices);
6181 struct detected_devices_node {
6182 struct list_head list;
6186 void md_autodetect_dev(dev_t dev)
6188 struct detected_devices_node *node_detected_dev;
6190 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6191 if (node_detected_dev) {
6192 node_detected_dev->dev = dev;
6193 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6195 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6196 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6201 static void autostart_arrays(int part)
6204 struct detected_devices_node *node_detected_dev;
6206 int i_scanned, i_passed;
6211 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6213 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6215 node_detected_dev = list_entry(all_detected_devices.next,
6216 struct detected_devices_node, list);
6217 list_del(&node_detected_dev->list);
6218 dev = node_detected_dev->dev;
6219 kfree(node_detected_dev);
6220 rdev = md_import_device(dev,0, 90);
6224 if (test_bit(Faulty, &rdev->flags)) {
6228 set_bit(AutoDetected, &rdev->flags);
6229 list_add(&rdev->same_set, &pending_raid_disks);
6233 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6234 i_scanned, i_passed);
6236 autorun_devices(part);
6239 #endif /* !MODULE */
6241 static __exit void md_exit(void)
6244 struct list_head *tmp;
6246 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6247 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6249 unregister_blkdev(MAJOR_NR,"md");
6250 unregister_blkdev(mdp_major, "mdp");
6251 unregister_reboot_notifier(&md_notifier);
6252 unregister_sysctl_table(raid_table_header);
6253 remove_proc_entry("mdstat", NULL);
6254 for_each_mddev(mddev, tmp) {
6255 struct gendisk *disk = mddev->gendisk;
6258 export_array(mddev);
6261 mddev->gendisk = NULL;
6266 subsys_initcall(md_init);
6267 module_exit(md_exit)
6269 static int get_ro(char *buffer, struct kernel_param *kp)
6271 return sprintf(buffer, "%d", start_readonly);
6273 static int set_ro(const char *val, struct kernel_param *kp)
6276 int num = simple_strtoul(val, &e, 10);
6277 if (*val && (*e == '\0' || *e == '\n')) {
6278 start_readonly = num;
6284 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6285 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6288 EXPORT_SYMBOL(register_md_personality);
6289 EXPORT_SYMBOL(unregister_md_personality);
6290 EXPORT_SYMBOL(md_error);
6291 EXPORT_SYMBOL(md_done_sync);
6292 EXPORT_SYMBOL(md_write_start);
6293 EXPORT_SYMBOL(md_write_end);
6294 EXPORT_SYMBOL(md_register_thread);
6295 EXPORT_SYMBOL(md_unregister_thread);
6296 EXPORT_SYMBOL(md_wakeup_thread);
6297 EXPORT_SYMBOL(md_check_recovery);
6298 MODULE_LICENSE("GPL");
6300 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);