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;
1984 sprintf(nm, "rd%d", rdev->raid_disk);
1985 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
1987 "md: cannot register "
1989 nm, mdname(rdev->mddev));
1991 /* don't wakeup anyone, leave that to userspace. */
1993 if (slot >= rdev->mddev->raid_disks)
1995 rdev->raid_disk = slot;
1996 /* assume it is working */
1997 clear_bit(Faulty, &rdev->flags);
1998 clear_bit(WriteMostly, &rdev->flags);
1999 set_bit(In_sync, &rdev->flags);
2005 static struct rdev_sysfs_entry rdev_slot =
2006 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2009 offset_show(mdk_rdev_t *rdev, char *page)
2011 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2015 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2018 unsigned long long offset = simple_strtoull(buf, &e, 10);
2019 if (e==buf || (*e && *e != '\n'))
2021 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2023 if (rdev->size && rdev->mddev->external)
2024 /* Must set offset before size, so overlap checks
2027 rdev->data_offset = offset;
2031 static struct rdev_sysfs_entry rdev_offset =
2032 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2035 rdev_size_show(mdk_rdev_t *rdev, char *page)
2037 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2040 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2042 /* check if two start/length pairs overlap */
2051 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2054 unsigned long long size = simple_strtoull(buf, &e, 10);
2055 unsigned long long oldsize = rdev->size;
2056 mddev_t *my_mddev = rdev->mddev;
2058 if (e==buf || (*e && *e != '\n'))
2060 if (my_mddev->pers && rdev->raid_disk >= 0)
2063 if (size > oldsize && rdev->mddev->external) {
2064 /* need to check that all other rdevs with the same ->bdev
2065 * do not overlap. We need to unlock the mddev to avoid
2066 * a deadlock. We have already changed rdev->size, and if
2067 * we have to change it back, we will have the lock again.
2071 struct list_head *tmp, *tmp2;
2073 mddev_unlock(my_mddev);
2074 for_each_mddev(mddev, tmp) {
2078 rdev_for_each(rdev2, tmp2, mddev)
2079 if (test_bit(AllReserved, &rdev2->flags) ||
2080 (rdev->bdev == rdev2->bdev &&
2082 overlaps(rdev->data_offset, rdev->size,
2083 rdev2->data_offset, rdev2->size))) {
2087 mddev_unlock(mddev);
2093 mddev_lock(my_mddev);
2095 /* Someone else could have slipped in a size
2096 * change here, but doing so is just silly.
2097 * We put oldsize back because we *know* it is
2098 * safe, and trust userspace not to race with
2101 rdev->size = oldsize;
2105 if (size < my_mddev->size || my_mddev->size == 0)
2106 my_mddev->size = size;
2110 static struct rdev_sysfs_entry rdev_size =
2111 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2113 static struct attribute *rdev_default_attrs[] = {
2122 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2124 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2125 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2126 mddev_t *mddev = rdev->mddev;
2132 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2134 if (rdev->mddev == NULL)
2137 rv = entry->show(rdev, page);
2138 mddev_unlock(mddev);
2144 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2145 const char *page, size_t length)
2147 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2148 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2150 mddev_t *mddev = rdev->mddev;
2154 if (!capable(CAP_SYS_ADMIN))
2156 rv = mddev ? mddev_lock(mddev): -EBUSY;
2158 if (rdev->mddev == NULL)
2161 rv = entry->store(rdev, page, length);
2162 mddev_unlock(mddev);
2167 static void rdev_free(struct kobject *ko)
2169 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2172 static struct sysfs_ops rdev_sysfs_ops = {
2173 .show = rdev_attr_show,
2174 .store = rdev_attr_store,
2176 static struct kobj_type rdev_ktype = {
2177 .release = rdev_free,
2178 .sysfs_ops = &rdev_sysfs_ops,
2179 .default_attrs = rdev_default_attrs,
2183 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2185 * mark the device faulty if:
2187 * - the device is nonexistent (zero size)
2188 * - the device has no valid superblock
2190 * a faulty rdev _never_ has rdev->sb set.
2192 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2194 char b[BDEVNAME_SIZE];
2199 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2201 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2202 return ERR_PTR(-ENOMEM);
2205 if ((err = alloc_disk_sb(rdev)))
2208 err = lock_rdev(rdev, newdev, super_format == -2);
2212 kobject_init(&rdev->kobj, &rdev_ktype);
2215 rdev->saved_raid_disk = -1;
2216 rdev->raid_disk = -1;
2218 rdev->data_offset = 0;
2219 rdev->sb_events = 0;
2220 atomic_set(&rdev->nr_pending, 0);
2221 atomic_set(&rdev->read_errors, 0);
2222 atomic_set(&rdev->corrected_errors, 0);
2224 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2227 "md: %s has zero or unknown size, marking faulty!\n",
2228 bdevname(rdev->bdev,b));
2233 if (super_format >= 0) {
2234 err = super_types[super_format].
2235 load_super(rdev, NULL, super_minor);
2236 if (err == -EINVAL) {
2238 "md: %s does not have a valid v%d.%d "
2239 "superblock, not importing!\n",
2240 bdevname(rdev->bdev,b),
2241 super_format, super_minor);
2246 "md: could not read %s's sb, not importing!\n",
2247 bdevname(rdev->bdev,b));
2252 INIT_LIST_HEAD(&rdev->same_set);
2253 init_waitqueue_head(&rdev->blocked_wait);
2258 if (rdev->sb_page) {
2264 return ERR_PTR(err);
2268 * Check a full RAID array for plausibility
2272 static void analyze_sbs(mddev_t * mddev)
2275 struct list_head *tmp;
2276 mdk_rdev_t *rdev, *freshest;
2277 char b[BDEVNAME_SIZE];
2280 rdev_for_each(rdev, tmp, mddev)
2281 switch (super_types[mddev->major_version].
2282 load_super(rdev, freshest, mddev->minor_version)) {
2290 "md: fatal superblock inconsistency in %s"
2291 " -- removing from array\n",
2292 bdevname(rdev->bdev,b));
2293 kick_rdev_from_array(rdev);
2297 super_types[mddev->major_version].
2298 validate_super(mddev, freshest);
2301 rdev_for_each(rdev, tmp, mddev) {
2302 if (rdev != freshest)
2303 if (super_types[mddev->major_version].
2304 validate_super(mddev, rdev)) {
2305 printk(KERN_WARNING "md: kicking non-fresh %s"
2307 bdevname(rdev->bdev,b));
2308 kick_rdev_from_array(rdev);
2311 if (mddev->level == LEVEL_MULTIPATH) {
2312 rdev->desc_nr = i++;
2313 rdev->raid_disk = rdev->desc_nr;
2314 set_bit(In_sync, &rdev->flags);
2315 } else if (rdev->raid_disk >= mddev->raid_disks) {
2316 rdev->raid_disk = -1;
2317 clear_bit(In_sync, &rdev->flags);
2323 if (mddev->recovery_cp != MaxSector &&
2325 printk(KERN_ERR "md: %s: raid array is not clean"
2326 " -- starting background reconstruction\n",
2332 safe_delay_show(mddev_t *mddev, char *page)
2334 int msec = (mddev->safemode_delay*1000)/HZ;
2335 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2338 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2346 /* remove a period, and count digits after it */
2347 if (len >= sizeof(buf))
2349 strlcpy(buf, cbuf, len);
2351 for (i=0; i<len; i++) {
2353 if (isdigit(buf[i])) {
2358 } else if (buf[i] == '.') {
2363 msec = simple_strtoul(buf, &e, 10);
2364 if (e == buf || (*e && *e != '\n'))
2366 msec = (msec * 1000) / scale;
2368 mddev->safemode_delay = 0;
2370 mddev->safemode_delay = (msec*HZ)/1000;
2371 if (mddev->safemode_delay == 0)
2372 mddev->safemode_delay = 1;
2376 static struct md_sysfs_entry md_safe_delay =
2377 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2380 level_show(mddev_t *mddev, char *page)
2382 struct mdk_personality *p = mddev->pers;
2384 return sprintf(page, "%s\n", p->name);
2385 else if (mddev->clevel[0])
2386 return sprintf(page, "%s\n", mddev->clevel);
2387 else if (mddev->level != LEVEL_NONE)
2388 return sprintf(page, "%d\n", mddev->level);
2394 level_store(mddev_t *mddev, const char *buf, size_t len)
2401 if (len >= sizeof(mddev->clevel))
2403 strncpy(mddev->clevel, buf, len);
2404 if (mddev->clevel[len-1] == '\n')
2406 mddev->clevel[len] = 0;
2407 mddev->level = LEVEL_NONE;
2411 static struct md_sysfs_entry md_level =
2412 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2416 layout_show(mddev_t *mddev, char *page)
2418 /* just a number, not meaningful for all levels */
2419 if (mddev->reshape_position != MaxSector &&
2420 mddev->layout != mddev->new_layout)
2421 return sprintf(page, "%d (%d)\n",
2422 mddev->new_layout, mddev->layout);
2423 return sprintf(page, "%d\n", mddev->layout);
2427 layout_store(mddev_t *mddev, const char *buf, size_t len)
2430 unsigned long n = simple_strtoul(buf, &e, 10);
2432 if (!*buf || (*e && *e != '\n'))
2437 if (mddev->reshape_position != MaxSector)
2438 mddev->new_layout = n;
2443 static struct md_sysfs_entry md_layout =
2444 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2448 raid_disks_show(mddev_t *mddev, char *page)
2450 if (mddev->raid_disks == 0)
2452 if (mddev->reshape_position != MaxSector &&
2453 mddev->delta_disks != 0)
2454 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2455 mddev->raid_disks - mddev->delta_disks);
2456 return sprintf(page, "%d\n", mddev->raid_disks);
2459 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2462 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2466 unsigned long n = simple_strtoul(buf, &e, 10);
2468 if (!*buf || (*e && *e != '\n'))
2472 rv = update_raid_disks(mddev, n);
2473 else if (mddev->reshape_position != MaxSector) {
2474 int olddisks = mddev->raid_disks - mddev->delta_disks;
2475 mddev->delta_disks = n - olddisks;
2476 mddev->raid_disks = n;
2478 mddev->raid_disks = n;
2479 return rv ? rv : len;
2481 static struct md_sysfs_entry md_raid_disks =
2482 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2485 chunk_size_show(mddev_t *mddev, char *page)
2487 if (mddev->reshape_position != MaxSector &&
2488 mddev->chunk_size != mddev->new_chunk)
2489 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2491 return sprintf(page, "%d\n", mddev->chunk_size);
2495 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2497 /* can only set chunk_size if array is not yet active */
2499 unsigned long n = simple_strtoul(buf, &e, 10);
2501 if (!*buf || (*e && *e != '\n'))
2506 else if (mddev->reshape_position != MaxSector)
2507 mddev->new_chunk = n;
2509 mddev->chunk_size = n;
2512 static struct md_sysfs_entry md_chunk_size =
2513 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2516 resync_start_show(mddev_t *mddev, char *page)
2518 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2522 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2525 unsigned long long n = simple_strtoull(buf, &e, 10);
2529 if (!*buf || (*e && *e != '\n'))
2532 mddev->recovery_cp = n;
2535 static struct md_sysfs_entry md_resync_start =
2536 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2539 * The array state can be:
2542 * No devices, no size, no level
2543 * Equivalent to STOP_ARRAY ioctl
2545 * May have some settings, but array is not active
2546 * all IO results in error
2547 * When written, doesn't tear down array, but just stops it
2548 * suspended (not supported yet)
2549 * All IO requests will block. The array can be reconfigured.
2550 * Writing this, if accepted, will block until array is quiessent
2552 * no resync can happen. no superblocks get written.
2553 * write requests fail
2555 * like readonly, but behaves like 'clean' on a write request.
2557 * clean - no pending writes, but otherwise active.
2558 * When written to inactive array, starts without resync
2559 * If a write request arrives then
2560 * if metadata is known, mark 'dirty' and switch to 'active'.
2561 * if not known, block and switch to write-pending
2562 * If written to an active array that has pending writes, then fails.
2564 * fully active: IO and resync can be happening.
2565 * When written to inactive array, starts with resync
2568 * clean, but writes are blocked waiting for 'active' to be written.
2571 * like active, but no writes have been seen for a while (100msec).
2574 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2575 write_pending, active_idle, bad_word};
2576 static char *array_states[] = {
2577 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2578 "write-pending", "active-idle", NULL };
2580 static int match_word(const char *word, char **list)
2583 for (n=0; list[n]; n++)
2584 if (cmd_match(word, list[n]))
2590 array_state_show(mddev_t *mddev, char *page)
2592 enum array_state st = inactive;
2605 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2607 else if (mddev->safemode)
2613 if (list_empty(&mddev->disks) &&
2614 mddev->raid_disks == 0 &&
2620 return sprintf(page, "%s\n", array_states[st]);
2623 static int do_md_stop(mddev_t * mddev, int ro);
2624 static int do_md_run(mddev_t * mddev);
2625 static int restart_array(mddev_t *mddev);
2628 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2631 enum array_state st = match_word(buf, array_states);
2636 /* stopping an active array */
2637 if (atomic_read(&mddev->active) > 1)
2639 err = do_md_stop(mddev, 0);
2642 /* stopping an active array */
2644 if (atomic_read(&mddev->active) > 1)
2646 err = do_md_stop(mddev, 2);
2648 err = 0; /* already inactive */
2651 break; /* not supported yet */
2654 err = do_md_stop(mddev, 1);
2657 set_disk_ro(mddev->gendisk, 1);
2658 err = do_md_run(mddev);
2664 err = do_md_stop(mddev, 1);
2666 err = restart_array(mddev);
2669 set_disk_ro(mddev->gendisk, 0);
2673 err = do_md_run(mddev);
2678 restart_array(mddev);
2679 spin_lock_irq(&mddev->write_lock);
2680 if (atomic_read(&mddev->writes_pending) == 0) {
2681 if (mddev->in_sync == 0) {
2683 if (mddev->safemode == 1)
2684 mddev->safemode = 0;
2685 if (mddev->persistent)
2686 set_bit(MD_CHANGE_CLEAN,
2692 spin_unlock_irq(&mddev->write_lock);
2695 mddev->recovery_cp = MaxSector;
2696 err = do_md_run(mddev);
2701 restart_array(mddev);
2702 if (mddev->external)
2703 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2704 wake_up(&mddev->sb_wait);
2708 set_disk_ro(mddev->gendisk, 0);
2709 err = do_md_run(mddev);
2714 /* these cannot be set */
2722 static struct md_sysfs_entry md_array_state =
2723 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2726 null_show(mddev_t *mddev, char *page)
2732 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2734 /* buf must be %d:%d\n? giving major and minor numbers */
2735 /* The new device is added to the array.
2736 * If the array has a persistent superblock, we read the
2737 * superblock to initialise info and check validity.
2738 * Otherwise, only checking done is that in bind_rdev_to_array,
2739 * which mainly checks size.
2742 int major = simple_strtoul(buf, &e, 10);
2748 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2750 minor = simple_strtoul(e+1, &e, 10);
2751 if (*e && *e != '\n')
2753 dev = MKDEV(major, minor);
2754 if (major != MAJOR(dev) ||
2755 minor != MINOR(dev))
2759 if (mddev->persistent) {
2760 rdev = md_import_device(dev, mddev->major_version,
2761 mddev->minor_version);
2762 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2763 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2764 mdk_rdev_t, same_set);
2765 err = super_types[mddev->major_version]
2766 .load_super(rdev, rdev0, mddev->minor_version);
2770 } else if (mddev->external)
2771 rdev = md_import_device(dev, -2, -1);
2773 rdev = md_import_device(dev, -1, -1);
2776 return PTR_ERR(rdev);
2777 err = bind_rdev_to_array(rdev, mddev);
2781 return err ? err : len;
2784 static struct md_sysfs_entry md_new_device =
2785 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2788 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2791 unsigned long chunk, end_chunk;
2795 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2797 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2798 if (buf == end) break;
2799 if (*end == '-') { /* range */
2801 end_chunk = simple_strtoul(buf, &end, 0);
2802 if (buf == end) break;
2804 if (*end && !isspace(*end)) break;
2805 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2807 while (isspace(*buf)) buf++;
2809 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2814 static struct md_sysfs_entry md_bitmap =
2815 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2818 size_show(mddev_t *mddev, char *page)
2820 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2823 static int update_size(mddev_t *mddev, unsigned long size);
2826 size_store(mddev_t *mddev, const char *buf, size_t len)
2828 /* If array is inactive, we can reduce the component size, but
2829 * not increase it (except from 0).
2830 * If array is active, we can try an on-line resize
2834 unsigned long long size = simple_strtoull(buf, &e, 10);
2835 if (!*buf || *buf == '\n' ||
2840 err = update_size(mddev, size);
2841 md_update_sb(mddev, 1);
2843 if (mddev->size == 0 ||
2849 return err ? err : len;
2852 static struct md_sysfs_entry md_size =
2853 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2858 * 'none' for arrays with no metadata (good luck...)
2859 * 'external' for arrays with externally managed metadata,
2860 * or N.M for internally known formats
2863 metadata_show(mddev_t *mddev, char *page)
2865 if (mddev->persistent)
2866 return sprintf(page, "%d.%d\n",
2867 mddev->major_version, mddev->minor_version);
2868 else if (mddev->external)
2869 return sprintf(page, "external:%s\n", mddev->metadata_type);
2871 return sprintf(page, "none\n");
2875 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2879 if (!list_empty(&mddev->disks))
2882 if (cmd_match(buf, "none")) {
2883 mddev->persistent = 0;
2884 mddev->external = 0;
2885 mddev->major_version = 0;
2886 mddev->minor_version = 90;
2889 if (strncmp(buf, "external:", 9) == 0) {
2890 size_t namelen = len-9;
2891 if (namelen >= sizeof(mddev->metadata_type))
2892 namelen = sizeof(mddev->metadata_type)-1;
2893 strncpy(mddev->metadata_type, buf+9, namelen);
2894 mddev->metadata_type[namelen] = 0;
2895 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2896 mddev->metadata_type[--namelen] = 0;
2897 mddev->persistent = 0;
2898 mddev->external = 1;
2899 mddev->major_version = 0;
2900 mddev->minor_version = 90;
2903 major = simple_strtoul(buf, &e, 10);
2904 if (e==buf || *e != '.')
2907 minor = simple_strtoul(buf, &e, 10);
2908 if (e==buf || (*e && *e != '\n') )
2910 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2912 mddev->major_version = major;
2913 mddev->minor_version = minor;
2914 mddev->persistent = 1;
2915 mddev->external = 0;
2919 static struct md_sysfs_entry md_metadata =
2920 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2923 action_show(mddev_t *mddev, char *page)
2925 char *type = "idle";
2926 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2927 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2928 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2930 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2931 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2933 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2940 return sprintf(page, "%s\n", type);
2944 action_store(mddev_t *mddev, const char *page, size_t len)
2946 if (!mddev->pers || !mddev->pers->sync_request)
2949 if (cmd_match(page, "idle")) {
2950 if (mddev->sync_thread) {
2951 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2952 md_unregister_thread(mddev->sync_thread);
2953 mddev->sync_thread = NULL;
2954 mddev->recovery = 0;
2956 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2957 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2959 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2960 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2961 else if (cmd_match(page, "reshape")) {
2963 if (mddev->pers->start_reshape == NULL)
2965 err = mddev->pers->start_reshape(mddev);
2969 if (cmd_match(page, "check"))
2970 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2971 else if (!cmd_match(page, "repair"))
2973 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2974 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2976 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2977 md_wakeup_thread(mddev->thread);
2982 mismatch_cnt_show(mddev_t *mddev, char *page)
2984 return sprintf(page, "%llu\n",
2985 (unsigned long long) mddev->resync_mismatches);
2988 static struct md_sysfs_entry md_scan_mode =
2989 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2992 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
2995 sync_min_show(mddev_t *mddev, char *page)
2997 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2998 mddev->sync_speed_min ? "local": "system");
3002 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3006 if (strncmp(buf, "system", 6)==0) {
3007 mddev->sync_speed_min = 0;
3010 min = simple_strtoul(buf, &e, 10);
3011 if (buf == e || (*e && *e != '\n') || min <= 0)
3013 mddev->sync_speed_min = min;
3017 static struct md_sysfs_entry md_sync_min =
3018 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3021 sync_max_show(mddev_t *mddev, char *page)
3023 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3024 mddev->sync_speed_max ? "local": "system");
3028 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3032 if (strncmp(buf, "system", 6)==0) {
3033 mddev->sync_speed_max = 0;
3036 max = simple_strtoul(buf, &e, 10);
3037 if (buf == e || (*e && *e != '\n') || max <= 0)
3039 mddev->sync_speed_max = max;
3043 static struct md_sysfs_entry md_sync_max =
3044 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3047 degraded_show(mddev_t *mddev, char *page)
3049 return sprintf(page, "%d\n", mddev->degraded);
3051 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3054 sync_force_parallel_show(mddev_t *mddev, char *page)
3056 return sprintf(page, "%d\n", mddev->parallel_resync);
3060 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3064 if (strict_strtol(buf, 10, &n))
3067 if (n != 0 && n != 1)
3070 mddev->parallel_resync = n;
3072 if (mddev->sync_thread)
3073 wake_up(&resync_wait);
3078 /* force parallel resync, even with shared block devices */
3079 static struct md_sysfs_entry md_sync_force_parallel =
3080 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3081 sync_force_parallel_show, sync_force_parallel_store);
3084 sync_speed_show(mddev_t *mddev, char *page)
3086 unsigned long resync, dt, db;
3087 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
3088 dt = ((jiffies - mddev->resync_mark) / HZ);
3090 db = resync - (mddev->resync_mark_cnt);
3091 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
3094 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3097 sync_completed_show(mddev_t *mddev, char *page)
3099 unsigned long max_blocks, resync;
3101 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3102 max_blocks = mddev->resync_max_sectors;
3104 max_blocks = mddev->size << 1;
3106 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3107 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3110 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3113 min_sync_show(mddev_t *mddev, char *page)
3115 return sprintf(page, "%llu\n",
3116 (unsigned long long)mddev->resync_min);
3119 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3121 unsigned long long min;
3122 if (strict_strtoull(buf, 10, &min))
3124 if (min > mddev->resync_max)
3126 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3129 /* Must be a multiple of chunk_size */
3130 if (mddev->chunk_size) {
3131 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3134 mddev->resync_min = min;
3139 static struct md_sysfs_entry md_min_sync =
3140 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3143 max_sync_show(mddev_t *mddev, char *page)
3145 if (mddev->resync_max == MaxSector)
3146 return sprintf(page, "max\n");
3148 return sprintf(page, "%llu\n",
3149 (unsigned long long)mddev->resync_max);
3152 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3154 if (strncmp(buf, "max", 3) == 0)
3155 mddev->resync_max = MaxSector;
3157 unsigned long long max;
3158 if (strict_strtoull(buf, 10, &max))
3160 if (max < mddev->resync_min)
3162 if (max < mddev->resync_max &&
3163 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3166 /* Must be a multiple of chunk_size */
3167 if (mddev->chunk_size) {
3168 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3171 mddev->resync_max = max;
3173 wake_up(&mddev->recovery_wait);
3177 static struct md_sysfs_entry md_max_sync =
3178 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3181 suspend_lo_show(mddev_t *mddev, char *page)
3183 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3187 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3190 unsigned long long new = simple_strtoull(buf, &e, 10);
3192 if (mddev->pers->quiesce == NULL)
3194 if (buf == e || (*e && *e != '\n'))
3196 if (new >= mddev->suspend_hi ||
3197 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3198 mddev->suspend_lo = new;
3199 mddev->pers->quiesce(mddev, 2);
3204 static struct md_sysfs_entry md_suspend_lo =
3205 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3209 suspend_hi_show(mddev_t *mddev, char *page)
3211 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3215 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3218 unsigned long long new = simple_strtoull(buf, &e, 10);
3220 if (mddev->pers->quiesce == NULL)
3222 if (buf == e || (*e && *e != '\n'))
3224 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3225 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3226 mddev->suspend_hi = new;
3227 mddev->pers->quiesce(mddev, 1);
3228 mddev->pers->quiesce(mddev, 0);
3233 static struct md_sysfs_entry md_suspend_hi =
3234 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3237 reshape_position_show(mddev_t *mddev, char *page)
3239 if (mddev->reshape_position != MaxSector)
3240 return sprintf(page, "%llu\n",
3241 (unsigned long long)mddev->reshape_position);
3242 strcpy(page, "none\n");
3247 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3250 unsigned long long new = simple_strtoull(buf, &e, 10);
3253 if (buf == e || (*e && *e != '\n'))
3255 mddev->reshape_position = new;
3256 mddev->delta_disks = 0;
3257 mddev->new_level = mddev->level;
3258 mddev->new_layout = mddev->layout;
3259 mddev->new_chunk = mddev->chunk_size;
3263 static struct md_sysfs_entry md_reshape_position =
3264 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3265 reshape_position_store);
3268 static struct attribute *md_default_attrs[] = {
3271 &md_raid_disks.attr,
3272 &md_chunk_size.attr,
3274 &md_resync_start.attr,
3276 &md_new_device.attr,
3277 &md_safe_delay.attr,
3278 &md_array_state.attr,
3279 &md_reshape_position.attr,
3283 static struct attribute *md_redundancy_attrs[] = {
3285 &md_mismatches.attr,
3288 &md_sync_speed.attr,
3289 &md_sync_force_parallel.attr,
3290 &md_sync_completed.attr,
3293 &md_suspend_lo.attr,
3294 &md_suspend_hi.attr,
3299 static struct attribute_group md_redundancy_group = {
3301 .attrs = md_redundancy_attrs,
3306 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3308 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3309 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3314 rv = mddev_lock(mddev);
3316 rv = entry->show(mddev, page);
3317 mddev_unlock(mddev);
3323 md_attr_store(struct kobject *kobj, struct attribute *attr,
3324 const char *page, size_t length)
3326 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3327 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3332 if (!capable(CAP_SYS_ADMIN))
3334 rv = mddev_lock(mddev);
3336 rv = entry->store(mddev, page, length);
3337 mddev_unlock(mddev);
3342 static void md_free(struct kobject *ko)
3344 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3348 static struct sysfs_ops md_sysfs_ops = {
3349 .show = md_attr_show,
3350 .store = md_attr_store,
3352 static struct kobj_type md_ktype = {
3354 .sysfs_ops = &md_sysfs_ops,
3355 .default_attrs = md_default_attrs,
3360 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3362 static DEFINE_MUTEX(disks_mutex);
3363 mddev_t *mddev = mddev_find(dev);
3364 struct gendisk *disk;
3365 int partitioned = (MAJOR(dev) != MD_MAJOR);
3366 int shift = partitioned ? MdpMinorShift : 0;
3367 int unit = MINOR(dev) >> shift;
3373 mutex_lock(&disks_mutex);
3374 if (mddev->gendisk) {
3375 mutex_unlock(&disks_mutex);
3379 disk = alloc_disk(1 << shift);
3381 mutex_unlock(&disks_mutex);
3385 disk->major = MAJOR(dev);
3386 disk->first_minor = unit << shift;
3388 sprintf(disk->disk_name, "md_d%d", unit);
3390 sprintf(disk->disk_name, "md%d", unit);
3391 disk->fops = &md_fops;
3392 disk->private_data = mddev;
3393 disk->queue = mddev->queue;
3395 mddev->gendisk = disk;
3396 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3398 mutex_unlock(&disks_mutex);
3400 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3403 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3407 static void md_safemode_timeout(unsigned long data)
3409 mddev_t *mddev = (mddev_t *) data;
3411 mddev->safemode = 1;
3412 md_wakeup_thread(mddev->thread);
3415 static int start_dirty_degraded;
3417 static int do_md_run(mddev_t * mddev)
3421 struct list_head *tmp;
3423 struct gendisk *disk;
3424 struct mdk_personality *pers;
3425 char b[BDEVNAME_SIZE];
3427 if (list_empty(&mddev->disks))
3428 /* cannot run an array with no devices.. */
3435 * Analyze all RAID superblock(s)
3437 if (!mddev->raid_disks) {
3438 if (!mddev->persistent)
3443 chunk_size = mddev->chunk_size;
3446 if (chunk_size > MAX_CHUNK_SIZE) {
3447 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3448 chunk_size, MAX_CHUNK_SIZE);
3452 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3454 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3455 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3458 if (chunk_size < PAGE_SIZE) {
3459 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3460 chunk_size, PAGE_SIZE);
3464 /* devices must have minimum size of one chunk */
3465 rdev_for_each(rdev, tmp, mddev) {
3466 if (test_bit(Faulty, &rdev->flags))
3468 if (rdev->size < chunk_size / 1024) {
3470 "md: Dev %s smaller than chunk_size:"
3472 bdevname(rdev->bdev,b),
3473 (unsigned long long)rdev->size,
3481 if (mddev->level != LEVEL_NONE)
3482 request_module("md-level-%d", mddev->level);
3483 else if (mddev->clevel[0])
3484 request_module("md-%s", mddev->clevel);
3488 * Drop all container device buffers, from now on
3489 * the only valid external interface is through the md
3492 rdev_for_each(rdev, tmp, mddev) {
3493 if (test_bit(Faulty, &rdev->flags))
3495 sync_blockdev(rdev->bdev);
3496 invalidate_bdev(rdev->bdev);
3498 /* perform some consistency tests on the device.
3499 * We don't want the data to overlap the metadata,
3500 * Internal Bitmap issues has handled elsewhere.
3502 if (rdev->data_offset < rdev->sb_offset) {
3504 rdev->data_offset + mddev->size*2
3505 > rdev->sb_offset*2) {
3506 printk("md: %s: data overlaps metadata\n",
3511 if (rdev->sb_offset*2 + rdev->sb_size/512
3512 > rdev->data_offset) {
3513 printk("md: %s: metadata overlaps data\n",
3520 md_probe(mddev->unit, NULL, NULL);
3521 disk = mddev->gendisk;
3525 spin_lock(&pers_lock);
3526 pers = find_pers(mddev->level, mddev->clevel);
3527 if (!pers || !try_module_get(pers->owner)) {
3528 spin_unlock(&pers_lock);
3529 if (mddev->level != LEVEL_NONE)
3530 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3533 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3538 spin_unlock(&pers_lock);
3539 mddev->level = pers->level;
3540 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3542 if (mddev->reshape_position != MaxSector &&
3543 pers->start_reshape == NULL) {
3544 /* This personality cannot handle reshaping... */
3546 module_put(pers->owner);
3550 if (pers->sync_request) {
3551 /* Warn if this is a potentially silly
3554 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3556 struct list_head *tmp2;
3558 rdev_for_each(rdev, tmp, mddev) {
3559 rdev_for_each(rdev2, tmp2, mddev) {
3561 rdev->bdev->bd_contains ==
3562 rdev2->bdev->bd_contains) {
3564 "%s: WARNING: %s appears to be"
3565 " on the same physical disk as"
3568 bdevname(rdev->bdev,b),
3569 bdevname(rdev2->bdev,b2));
3576 "True protection against single-disk"
3577 " failure might be compromised.\n");
3580 mddev->recovery = 0;
3581 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3582 mddev->barriers_work = 1;
3583 mddev->ok_start_degraded = start_dirty_degraded;
3586 mddev->ro = 2; /* read-only, but switch on first write */
3588 err = mddev->pers->run(mddev);
3589 if (!err && mddev->pers->sync_request) {
3590 err = bitmap_create(mddev);
3592 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3593 mdname(mddev), err);
3594 mddev->pers->stop(mddev);
3598 printk(KERN_ERR "md: pers->run() failed ...\n");
3599 module_put(mddev->pers->owner);
3601 bitmap_destroy(mddev);
3604 if (mddev->pers->sync_request) {
3605 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3607 "md: cannot register extra attributes for %s\n",
3609 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3612 atomic_set(&mddev->writes_pending,0);
3613 mddev->safemode = 0;
3614 mddev->safemode_timer.function = md_safemode_timeout;
3615 mddev->safemode_timer.data = (unsigned long) mddev;
3616 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3619 rdev_for_each(rdev, tmp, mddev)
3620 if (rdev->raid_disk >= 0) {
3622 sprintf(nm, "rd%d", rdev->raid_disk);
3623 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3624 printk("md: cannot register %s for %s\n",
3628 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3631 md_update_sb(mddev, 0);
3633 set_capacity(disk, mddev->array_size<<1);
3635 /* If we call blk_queue_make_request here, it will
3636 * re-initialise max_sectors etc which may have been
3637 * refined inside -> run. So just set the bits we need to set.
3638 * Most initialisation happended when we called
3639 * blk_queue_make_request(..., md_fail_request)
3642 mddev->queue->queuedata = mddev;
3643 mddev->queue->make_request_fn = mddev->pers->make_request;
3645 /* If there is a partially-recovered drive we need to
3646 * start recovery here. If we leave it to md_check_recovery,
3647 * it will remove the drives and not do the right thing
3649 if (mddev->degraded && !mddev->sync_thread) {
3650 struct list_head *rtmp;
3652 rdev_for_each(rdev, rtmp, mddev)
3653 if (rdev->raid_disk >= 0 &&
3654 !test_bit(In_sync, &rdev->flags) &&
3655 !test_bit(Faulty, &rdev->flags))
3656 /* complete an interrupted recovery */
3658 if (spares && mddev->pers->sync_request) {
3659 mddev->recovery = 0;
3660 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3661 mddev->sync_thread = md_register_thread(md_do_sync,
3664 if (!mddev->sync_thread) {
3665 printk(KERN_ERR "%s: could not start resync"
3668 /* leave the spares where they are, it shouldn't hurt */
3669 mddev->recovery = 0;
3673 md_wakeup_thread(mddev->thread);
3674 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3677 md_new_event(mddev);
3678 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
3682 static int restart_array(mddev_t *mddev)
3684 struct gendisk *disk = mddev->gendisk;
3688 * Complain if it has no devices
3691 if (list_empty(&mddev->disks))
3699 mddev->safemode = 0;
3701 set_disk_ro(disk, 0);
3703 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3706 * Kick recovery or resync if necessary
3708 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3709 md_wakeup_thread(mddev->thread);
3710 md_wakeup_thread(mddev->sync_thread);
3719 /* similar to deny_write_access, but accounts for our holding a reference
3720 * to the file ourselves */
3721 static int deny_bitmap_write_access(struct file * file)
3723 struct inode *inode = file->f_mapping->host;
3725 spin_lock(&inode->i_lock);
3726 if (atomic_read(&inode->i_writecount) > 1) {
3727 spin_unlock(&inode->i_lock);
3730 atomic_set(&inode->i_writecount, -1);
3731 spin_unlock(&inode->i_lock);
3736 static void restore_bitmap_write_access(struct file *file)
3738 struct inode *inode = file->f_mapping->host;
3740 spin_lock(&inode->i_lock);
3741 atomic_set(&inode->i_writecount, 1);
3742 spin_unlock(&inode->i_lock);
3746 * 0 - completely stop and dis-assemble array
3747 * 1 - switch to readonly
3748 * 2 - stop but do not disassemble array
3750 static int do_md_stop(mddev_t * mddev, int mode)
3753 struct gendisk *disk = mddev->gendisk;
3756 if (atomic_read(&mddev->active)>2) {
3757 printk("md: %s still in use.\n",mdname(mddev));
3761 if (mddev->sync_thread) {
3762 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3763 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3764 md_unregister_thread(mddev->sync_thread);
3765 mddev->sync_thread = NULL;
3768 del_timer_sync(&mddev->safemode_timer);
3770 invalidate_partition(disk, 0);
3773 case 1: /* readonly */
3779 case 0: /* disassemble */
3781 bitmap_flush(mddev);
3782 md_super_wait(mddev);
3784 set_disk_ro(disk, 0);
3785 blk_queue_make_request(mddev->queue, md_fail_request);
3786 mddev->pers->stop(mddev);
3787 mddev->queue->merge_bvec_fn = NULL;
3788 mddev->queue->unplug_fn = NULL;
3789 mddev->queue->backing_dev_info.congested_fn = NULL;
3790 if (mddev->pers->sync_request)
3791 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3793 module_put(mddev->pers->owner);
3795 /* tell userspace to handle 'inactive' */
3796 sysfs_notify(&mddev->kobj, NULL, "array_state");
3798 set_capacity(disk, 0);
3804 if (!mddev->in_sync || mddev->flags) {
3805 /* mark array as shutdown cleanly */
3807 md_update_sb(mddev, 1);
3810 set_disk_ro(disk, 1);
3811 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3815 * Free resources if final stop
3819 struct list_head *tmp;
3821 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3823 bitmap_destroy(mddev);
3824 if (mddev->bitmap_file) {
3825 restore_bitmap_write_access(mddev->bitmap_file);
3826 fput(mddev->bitmap_file);
3827 mddev->bitmap_file = NULL;
3829 mddev->bitmap_offset = 0;
3831 rdev_for_each(rdev, tmp, mddev)
3832 if (rdev->raid_disk >= 0) {
3834 sprintf(nm, "rd%d", rdev->raid_disk);
3835 sysfs_remove_link(&mddev->kobj, nm);
3838 /* make sure all md_delayed_delete calls have finished */
3839 flush_scheduled_work();
3841 export_array(mddev);
3843 mddev->array_size = 0;
3845 mddev->raid_disks = 0;
3846 mddev->recovery_cp = 0;
3847 mddev->resync_min = 0;
3848 mddev->resync_max = MaxSector;
3849 mddev->reshape_position = MaxSector;
3850 mddev->external = 0;
3851 mddev->persistent = 0;
3852 mddev->level = LEVEL_NONE;
3853 mddev->clevel[0] = 0;
3856 mddev->metadata_type[0] = 0;
3857 mddev->chunk_size = 0;
3858 mddev->ctime = mddev->utime = 0;
3860 mddev->max_disks = 0;
3862 mddev->delta_disks = 0;
3863 mddev->new_level = LEVEL_NONE;
3864 mddev->new_layout = 0;
3865 mddev->new_chunk = 0;
3866 mddev->curr_resync = 0;
3867 mddev->resync_mismatches = 0;
3868 mddev->suspend_lo = mddev->suspend_hi = 0;
3869 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3870 mddev->recovery = 0;
3873 mddev->degraded = 0;
3874 mddev->barriers_work = 0;
3875 mddev->safemode = 0;
3877 } else if (mddev->pers)
3878 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3881 md_new_event(mddev);
3887 static void autorun_array(mddev_t *mddev)
3890 struct list_head *tmp;
3893 if (list_empty(&mddev->disks))
3896 printk(KERN_INFO "md: running: ");
3898 rdev_for_each(rdev, tmp, mddev) {
3899 char b[BDEVNAME_SIZE];
3900 printk("<%s>", bdevname(rdev->bdev,b));
3904 err = do_md_run (mddev);
3906 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3907 do_md_stop (mddev, 0);
3912 * lets try to run arrays based on all disks that have arrived
3913 * until now. (those are in pending_raid_disks)
3915 * the method: pick the first pending disk, collect all disks with
3916 * the same UUID, remove all from the pending list and put them into
3917 * the 'same_array' list. Then order this list based on superblock
3918 * update time (freshest comes first), kick out 'old' disks and
3919 * compare superblocks. If everything's fine then run it.
3921 * If "unit" is allocated, then bump its reference count
3923 static void autorun_devices(int part)
3925 struct list_head *tmp;
3926 mdk_rdev_t *rdev0, *rdev;
3928 char b[BDEVNAME_SIZE];
3930 printk(KERN_INFO "md: autorun ...\n");
3931 while (!list_empty(&pending_raid_disks)) {
3934 LIST_HEAD(candidates);
3935 rdev0 = list_entry(pending_raid_disks.next,
3936 mdk_rdev_t, same_set);
3938 printk(KERN_INFO "md: considering %s ...\n",
3939 bdevname(rdev0->bdev,b));
3940 INIT_LIST_HEAD(&candidates);
3941 rdev_for_each_list(rdev, tmp, pending_raid_disks)
3942 if (super_90_load(rdev, rdev0, 0) >= 0) {
3943 printk(KERN_INFO "md: adding %s ...\n",
3944 bdevname(rdev->bdev,b));
3945 list_move(&rdev->same_set, &candidates);
3948 * now we have a set of devices, with all of them having
3949 * mostly sane superblocks. It's time to allocate the
3953 dev = MKDEV(mdp_major,
3954 rdev0->preferred_minor << MdpMinorShift);
3955 unit = MINOR(dev) >> MdpMinorShift;
3957 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3960 if (rdev0->preferred_minor != unit) {
3961 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3962 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3966 md_probe(dev, NULL, NULL);
3967 mddev = mddev_find(dev);
3968 if (!mddev || !mddev->gendisk) {
3972 "md: cannot allocate memory for md drive.\n");
3975 if (mddev_lock(mddev))
3976 printk(KERN_WARNING "md: %s locked, cannot run\n",
3978 else if (mddev->raid_disks || mddev->major_version
3979 || !list_empty(&mddev->disks)) {
3981 "md: %s already running, cannot run %s\n",
3982 mdname(mddev), bdevname(rdev0->bdev,b));
3983 mddev_unlock(mddev);
3985 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3986 mddev->persistent = 1;
3987 rdev_for_each_list(rdev, tmp, candidates) {
3988 list_del_init(&rdev->same_set);
3989 if (bind_rdev_to_array(rdev, mddev))
3992 autorun_array(mddev);
3993 mddev_unlock(mddev);
3995 /* on success, candidates will be empty, on error
3998 rdev_for_each_list(rdev, tmp, candidates)
4002 printk(KERN_INFO "md: ... autorun DONE.\n");
4004 #endif /* !MODULE */
4006 static int get_version(void __user * arg)
4010 ver.major = MD_MAJOR_VERSION;
4011 ver.minor = MD_MINOR_VERSION;
4012 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4014 if (copy_to_user(arg, &ver, sizeof(ver)))
4020 static int get_array_info(mddev_t * mddev, void __user * arg)
4022 mdu_array_info_t info;
4023 int nr,working,active,failed,spare;
4025 struct list_head *tmp;
4027 nr=working=active=failed=spare=0;
4028 rdev_for_each(rdev, tmp, mddev) {
4030 if (test_bit(Faulty, &rdev->flags))
4034 if (test_bit(In_sync, &rdev->flags))
4041 info.major_version = mddev->major_version;
4042 info.minor_version = mddev->minor_version;
4043 info.patch_version = MD_PATCHLEVEL_VERSION;
4044 info.ctime = mddev->ctime;
4045 info.level = mddev->level;
4046 info.size = mddev->size;
4047 if (info.size != mddev->size) /* overflow */
4050 info.raid_disks = mddev->raid_disks;
4051 info.md_minor = mddev->md_minor;
4052 info.not_persistent= !mddev->persistent;
4054 info.utime = mddev->utime;
4057 info.state = (1<<MD_SB_CLEAN);
4058 if (mddev->bitmap && mddev->bitmap_offset)
4059 info.state = (1<<MD_SB_BITMAP_PRESENT);
4060 info.active_disks = active;
4061 info.working_disks = working;
4062 info.failed_disks = failed;
4063 info.spare_disks = spare;
4065 info.layout = mddev->layout;
4066 info.chunk_size = mddev->chunk_size;
4068 if (copy_to_user(arg, &info, sizeof(info)))
4074 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4076 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4077 char *ptr, *buf = NULL;
4080 md_allow_write(mddev);
4082 file = kmalloc(sizeof(*file), GFP_KERNEL);
4086 /* bitmap disabled, zero the first byte and copy out */
4087 if (!mddev->bitmap || !mddev->bitmap->file) {
4088 file->pathname[0] = '\0';
4092 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4096 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4100 strcpy(file->pathname, ptr);
4104 if (copy_to_user(arg, file, sizeof(*file)))
4112 static int get_disk_info(mddev_t * mddev, void __user * arg)
4114 mdu_disk_info_t info;
4118 if (copy_from_user(&info, arg, sizeof(info)))
4123 rdev = find_rdev_nr(mddev, nr);
4125 info.major = MAJOR(rdev->bdev->bd_dev);
4126 info.minor = MINOR(rdev->bdev->bd_dev);
4127 info.raid_disk = rdev->raid_disk;
4129 if (test_bit(Faulty, &rdev->flags))
4130 info.state |= (1<<MD_DISK_FAULTY);
4131 else if (test_bit(In_sync, &rdev->flags)) {
4132 info.state |= (1<<MD_DISK_ACTIVE);
4133 info.state |= (1<<MD_DISK_SYNC);
4135 if (test_bit(WriteMostly, &rdev->flags))
4136 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4138 info.major = info.minor = 0;
4139 info.raid_disk = -1;
4140 info.state = (1<<MD_DISK_REMOVED);
4143 if (copy_to_user(arg, &info, sizeof(info)))
4149 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4151 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4153 dev_t dev = MKDEV(info->major,info->minor);
4155 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4158 if (!mddev->raid_disks) {
4160 /* expecting a device which has a superblock */
4161 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4164 "md: md_import_device returned %ld\n",
4166 return PTR_ERR(rdev);
4168 if (!list_empty(&mddev->disks)) {
4169 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4170 mdk_rdev_t, same_set);
4171 int err = super_types[mddev->major_version]
4172 .load_super(rdev, rdev0, mddev->minor_version);
4175 "md: %s has different UUID to %s\n",
4176 bdevname(rdev->bdev,b),
4177 bdevname(rdev0->bdev,b2));
4182 err = bind_rdev_to_array(rdev, mddev);
4189 * add_new_disk can be used once the array is assembled
4190 * to add "hot spares". They must already have a superblock
4195 if (!mddev->pers->hot_add_disk) {
4197 "%s: personality does not support diskops!\n",
4201 if (mddev->persistent)
4202 rdev = md_import_device(dev, mddev->major_version,
4203 mddev->minor_version);
4205 rdev = md_import_device(dev, -1, -1);
4208 "md: md_import_device returned %ld\n",
4210 return PTR_ERR(rdev);
4212 /* set save_raid_disk if appropriate */
4213 if (!mddev->persistent) {
4214 if (info->state & (1<<MD_DISK_SYNC) &&
4215 info->raid_disk < mddev->raid_disks)
4216 rdev->raid_disk = info->raid_disk;
4218 rdev->raid_disk = -1;
4220 super_types[mddev->major_version].
4221 validate_super(mddev, rdev);
4222 rdev->saved_raid_disk = rdev->raid_disk;
4224 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4225 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4226 set_bit(WriteMostly, &rdev->flags);
4228 rdev->raid_disk = -1;
4229 err = bind_rdev_to_array(rdev, mddev);
4230 if (!err && !mddev->pers->hot_remove_disk) {
4231 /* If there is hot_add_disk but no hot_remove_disk
4232 * then added disks for geometry changes,
4233 * and should be added immediately.
4235 super_types[mddev->major_version].
4236 validate_super(mddev, rdev);
4237 err = mddev->pers->hot_add_disk(mddev, rdev);
4239 unbind_rdev_from_array(rdev);
4244 md_update_sb(mddev, 1);
4245 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4246 md_wakeup_thread(mddev->thread);
4250 /* otherwise, add_new_disk is only allowed
4251 * for major_version==0 superblocks
4253 if (mddev->major_version != 0) {
4254 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4259 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4261 rdev = md_import_device (dev, -1, 0);
4264 "md: error, md_import_device() returned %ld\n",
4266 return PTR_ERR(rdev);
4268 rdev->desc_nr = info->number;
4269 if (info->raid_disk < mddev->raid_disks)
4270 rdev->raid_disk = info->raid_disk;
4272 rdev->raid_disk = -1;
4274 if (rdev->raid_disk < mddev->raid_disks)
4275 if (info->state & (1<<MD_DISK_SYNC))
4276 set_bit(In_sync, &rdev->flags);
4278 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4279 set_bit(WriteMostly, &rdev->flags);
4281 if (!mddev->persistent) {
4282 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4283 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4285 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4286 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
4288 err = bind_rdev_to_array(rdev, mddev);
4298 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4300 char b[BDEVNAME_SIZE];
4303 rdev = find_rdev(mddev, dev);
4307 if (rdev->raid_disk >= 0)
4310 kick_rdev_from_array(rdev);
4311 md_update_sb(mddev, 1);
4312 md_new_event(mddev);
4316 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4317 bdevname(rdev->bdev,b), mdname(mddev));
4321 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4323 char b[BDEVNAME_SIZE];
4331 if (mddev->major_version != 0) {
4332 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4333 " version-0 superblocks.\n",
4337 if (!mddev->pers->hot_add_disk) {
4339 "%s: personality does not support diskops!\n",
4344 rdev = md_import_device (dev, -1, 0);
4347 "md: error, md_import_device() returned %ld\n",
4352 if (mddev->persistent)
4353 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4356 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4358 size = calc_dev_size(rdev, mddev->chunk_size);
4361 if (test_bit(Faulty, &rdev->flags)) {
4363 "md: can not hot-add faulty %s disk to %s!\n",
4364 bdevname(rdev->bdev,b), mdname(mddev));
4368 clear_bit(In_sync, &rdev->flags);
4370 rdev->saved_raid_disk = -1;
4371 err = bind_rdev_to_array(rdev, mddev);
4376 * The rest should better be atomic, we can have disk failures
4377 * noticed in interrupt contexts ...
4380 if (rdev->desc_nr == mddev->max_disks) {
4381 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4384 goto abort_unbind_export;
4387 rdev->raid_disk = -1;
4389 md_update_sb(mddev, 1);
4392 * Kick recovery, maybe this spare has to be added to the
4393 * array immediately.
4395 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4396 md_wakeup_thread(mddev->thread);
4397 md_new_event(mddev);
4400 abort_unbind_export:
4401 unbind_rdev_from_array(rdev);
4408 static int set_bitmap_file(mddev_t *mddev, int fd)
4413 if (!mddev->pers->quiesce)
4415 if (mddev->recovery || mddev->sync_thread)
4417 /* we should be able to change the bitmap.. */
4423 return -EEXIST; /* cannot add when bitmap is present */
4424 mddev->bitmap_file = fget(fd);
4426 if (mddev->bitmap_file == NULL) {
4427 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4432 err = deny_bitmap_write_access(mddev->bitmap_file);
4434 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4436 fput(mddev->bitmap_file);
4437 mddev->bitmap_file = NULL;
4440 mddev->bitmap_offset = 0; /* file overrides offset */
4441 } else if (mddev->bitmap == NULL)
4442 return -ENOENT; /* cannot remove what isn't there */
4445 mddev->pers->quiesce(mddev, 1);
4447 err = bitmap_create(mddev);
4448 if (fd < 0 || err) {
4449 bitmap_destroy(mddev);
4450 fd = -1; /* make sure to put the file */
4452 mddev->pers->quiesce(mddev, 0);
4455 if (mddev->bitmap_file) {
4456 restore_bitmap_write_access(mddev->bitmap_file);
4457 fput(mddev->bitmap_file);
4459 mddev->bitmap_file = NULL;
4466 * set_array_info is used two different ways
4467 * The original usage is when creating a new array.
4468 * In this usage, raid_disks is > 0 and it together with
4469 * level, size, not_persistent,layout,chunksize determine the
4470 * shape of the array.
4471 * This will always create an array with a type-0.90.0 superblock.
4472 * The newer usage is when assembling an array.
4473 * In this case raid_disks will be 0, and the major_version field is
4474 * use to determine which style super-blocks are to be found on the devices.
4475 * The minor and patch _version numbers are also kept incase the
4476 * super_block handler wishes to interpret them.
4478 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4481 if (info->raid_disks == 0) {
4482 /* just setting version number for superblock loading */
4483 if (info->major_version < 0 ||
4484 info->major_version >= ARRAY_SIZE(super_types) ||
4485 super_types[info->major_version].name == NULL) {
4486 /* maybe try to auto-load a module? */
4488 "md: superblock version %d not known\n",
4489 info->major_version);
4492 mddev->major_version = info->major_version;
4493 mddev->minor_version = info->minor_version;
4494 mddev->patch_version = info->patch_version;
4495 mddev->persistent = !info->not_persistent;
4498 mddev->major_version = MD_MAJOR_VERSION;
4499 mddev->minor_version = MD_MINOR_VERSION;
4500 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4501 mddev->ctime = get_seconds();
4503 mddev->level = info->level;
4504 mddev->clevel[0] = 0;
4505 mddev->size = info->size;
4506 mddev->raid_disks = info->raid_disks;
4507 /* don't set md_minor, it is determined by which /dev/md* was
4510 if (info->state & (1<<MD_SB_CLEAN))
4511 mddev->recovery_cp = MaxSector;
4513 mddev->recovery_cp = 0;
4514 mddev->persistent = ! info->not_persistent;
4515 mddev->external = 0;
4517 mddev->layout = info->layout;
4518 mddev->chunk_size = info->chunk_size;
4520 mddev->max_disks = MD_SB_DISKS;
4522 if (mddev->persistent)
4524 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4526 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4527 mddev->bitmap_offset = 0;
4529 mddev->reshape_position = MaxSector;
4532 * Generate a 128 bit UUID
4534 get_random_bytes(mddev->uuid, 16);
4536 mddev->new_level = mddev->level;
4537 mddev->new_chunk = mddev->chunk_size;
4538 mddev->new_layout = mddev->layout;
4539 mddev->delta_disks = 0;
4544 static int update_size(mddev_t *mddev, unsigned long size)
4548 struct list_head *tmp;
4549 int fit = (size == 0);
4551 if (mddev->pers->resize == NULL)
4553 /* The "size" is the amount of each device that is used.
4554 * This can only make sense for arrays with redundancy.
4555 * linear and raid0 always use whatever space is available
4556 * We can only consider changing the size if no resync
4557 * or reconstruction is happening, and if the new size
4558 * is acceptable. It must fit before the sb_offset or,
4559 * if that is <data_offset, it must fit before the
4560 * size of each device.
4561 * If size is zero, we find the largest size that fits.
4563 if (mddev->sync_thread)
4565 rdev_for_each(rdev, tmp, mddev) {
4567 avail = rdev->size * 2;
4569 if (fit && (size == 0 || size > avail/2))
4571 if (avail < ((sector_t)size << 1))
4574 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4576 struct block_device *bdev;
4578 bdev = bdget_disk(mddev->gendisk, 0);
4580 mutex_lock(&bdev->bd_inode->i_mutex);
4581 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4582 mutex_unlock(&bdev->bd_inode->i_mutex);
4589 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4592 /* change the number of raid disks */
4593 if (mddev->pers->check_reshape == NULL)
4595 if (raid_disks <= 0 ||
4596 raid_disks >= mddev->max_disks)
4598 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4600 mddev->delta_disks = raid_disks - mddev->raid_disks;
4602 rv = mddev->pers->check_reshape(mddev);
4608 * update_array_info is used to change the configuration of an
4610 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4611 * fields in the info are checked against the array.
4612 * Any differences that cannot be handled will cause an error.
4613 * Normally, only one change can be managed at a time.
4615 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4621 /* calculate expected state,ignoring low bits */
4622 if (mddev->bitmap && mddev->bitmap_offset)
4623 state |= (1 << MD_SB_BITMAP_PRESENT);
4625 if (mddev->major_version != info->major_version ||
4626 mddev->minor_version != info->minor_version ||
4627 /* mddev->patch_version != info->patch_version || */
4628 mddev->ctime != info->ctime ||
4629 mddev->level != info->level ||
4630 /* mddev->layout != info->layout || */
4631 !mddev->persistent != info->not_persistent||
4632 mddev->chunk_size != info->chunk_size ||
4633 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4634 ((state^info->state) & 0xfffffe00)
4637 /* Check there is only one change */
4638 if (info->size >= 0 && mddev->size != info->size) cnt++;
4639 if (mddev->raid_disks != info->raid_disks) cnt++;
4640 if (mddev->layout != info->layout) cnt++;
4641 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4642 if (cnt == 0) return 0;
4643 if (cnt > 1) return -EINVAL;
4645 if (mddev->layout != info->layout) {
4647 * we don't need to do anything at the md level, the
4648 * personality will take care of it all.
4650 if (mddev->pers->reconfig == NULL)
4653 return mddev->pers->reconfig(mddev, info->layout, -1);
4655 if (info->size >= 0 && mddev->size != info->size)
4656 rv = update_size(mddev, info->size);
4658 if (mddev->raid_disks != info->raid_disks)
4659 rv = update_raid_disks(mddev, info->raid_disks);
4661 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4662 if (mddev->pers->quiesce == NULL)
4664 if (mddev->recovery || mddev->sync_thread)
4666 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4667 /* add the bitmap */
4670 if (mddev->default_bitmap_offset == 0)
4672 mddev->bitmap_offset = mddev->default_bitmap_offset;
4673 mddev->pers->quiesce(mddev, 1);
4674 rv = bitmap_create(mddev);
4676 bitmap_destroy(mddev);
4677 mddev->pers->quiesce(mddev, 0);
4679 /* remove the bitmap */
4682 if (mddev->bitmap->file)
4684 mddev->pers->quiesce(mddev, 1);
4685 bitmap_destroy(mddev);
4686 mddev->pers->quiesce(mddev, 0);
4687 mddev->bitmap_offset = 0;
4690 md_update_sb(mddev, 1);
4694 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4698 if (mddev->pers == NULL)
4701 rdev = find_rdev(mddev, dev);
4705 md_error(mddev, rdev);
4709 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4711 mddev_t *mddev = bdev->bd_disk->private_data;
4715 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4719 static int md_ioctl(struct inode *inode, struct file *file,
4720 unsigned int cmd, unsigned long arg)
4723 void __user *argp = (void __user *)arg;
4724 mddev_t *mddev = NULL;
4726 if (!capable(CAP_SYS_ADMIN))
4730 * Commands dealing with the RAID driver but not any
4736 err = get_version(argp);
4739 case PRINT_RAID_DEBUG:
4747 autostart_arrays(arg);
4754 * Commands creating/starting a new array:
4757 mddev = inode->i_bdev->bd_disk->private_data;
4764 err = mddev_lock(mddev);
4767 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4774 case SET_ARRAY_INFO:
4776 mdu_array_info_t info;
4778 memset(&info, 0, sizeof(info));
4779 else if (copy_from_user(&info, argp, sizeof(info))) {
4784 err = update_array_info(mddev, &info);
4786 printk(KERN_WARNING "md: couldn't update"
4787 " array info. %d\n", err);
4792 if (!list_empty(&mddev->disks)) {
4794 "md: array %s already has disks!\n",
4799 if (mddev->raid_disks) {
4801 "md: array %s already initialised!\n",
4806 err = set_array_info(mddev, &info);
4808 printk(KERN_WARNING "md: couldn't set"
4809 " array info. %d\n", err);
4819 * Commands querying/configuring an existing array:
4821 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4822 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4823 if ((!mddev->raid_disks && !mddev->external)
4824 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4825 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4826 && cmd != GET_BITMAP_FILE) {
4832 * Commands even a read-only array can execute:
4836 case GET_ARRAY_INFO:
4837 err = get_array_info(mddev, argp);
4840 case GET_BITMAP_FILE:
4841 err = get_bitmap_file(mddev, argp);
4845 err = get_disk_info(mddev, argp);
4848 case RESTART_ARRAY_RW:
4849 err = restart_array(mddev);
4853 err = do_md_stop (mddev, 0);
4857 err = do_md_stop (mddev, 1);
4861 * We have a problem here : there is no easy way to give a CHS
4862 * virtual geometry. We currently pretend that we have a 2 heads
4863 * 4 sectors (with a BIG number of cylinders...). This drives
4864 * dosfs just mad... ;-)
4869 * The remaining ioctls are changing the state of the
4870 * superblock, so we do not allow them on read-only arrays.
4871 * However non-MD ioctls (e.g. get-size) will still come through
4872 * here and hit the 'default' below, so only disallow
4873 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4875 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4876 mddev->ro && mddev->pers) {
4877 if (mddev->ro == 2) {
4879 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4880 md_wakeup_thread(mddev->thread);
4892 mdu_disk_info_t info;
4893 if (copy_from_user(&info, argp, sizeof(info)))
4896 err = add_new_disk(mddev, &info);
4900 case HOT_REMOVE_DISK:
4901 err = hot_remove_disk(mddev, new_decode_dev(arg));
4905 err = hot_add_disk(mddev, new_decode_dev(arg));
4908 case SET_DISK_FAULTY:
4909 err = set_disk_faulty(mddev, new_decode_dev(arg));
4913 err = do_md_run (mddev);
4916 case SET_BITMAP_FILE:
4917 err = set_bitmap_file(mddev, (int)arg);
4927 mddev_unlock(mddev);
4937 static int md_open(struct inode *inode, struct file *file)
4940 * Succeed if we can lock the mddev, which confirms that
4941 * it isn't being stopped right now.
4943 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4946 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
4951 mddev_unlock(mddev);
4953 check_disk_change(inode->i_bdev);
4958 static int md_release(struct inode *inode, struct file * file)
4960 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4968 static int md_media_changed(struct gendisk *disk)
4970 mddev_t *mddev = disk->private_data;
4972 return mddev->changed;
4975 static int md_revalidate(struct gendisk *disk)
4977 mddev_t *mddev = disk->private_data;
4982 static struct block_device_operations md_fops =
4984 .owner = THIS_MODULE,
4986 .release = md_release,
4988 .getgeo = md_getgeo,
4989 .media_changed = md_media_changed,
4990 .revalidate_disk= md_revalidate,
4993 static int md_thread(void * arg)
4995 mdk_thread_t *thread = arg;
4998 * md_thread is a 'system-thread', it's priority should be very
4999 * high. We avoid resource deadlocks individually in each
5000 * raid personality. (RAID5 does preallocation) We also use RR and
5001 * the very same RT priority as kswapd, thus we will never get
5002 * into a priority inversion deadlock.
5004 * we definitely have to have equal or higher priority than
5005 * bdflush, otherwise bdflush will deadlock if there are too
5006 * many dirty RAID5 blocks.
5009 allow_signal(SIGKILL);
5010 while (!kthread_should_stop()) {
5012 /* We need to wait INTERRUPTIBLE so that
5013 * we don't add to the load-average.
5014 * That means we need to be sure no signals are
5017 if (signal_pending(current))
5018 flush_signals(current);
5020 wait_event_interruptible_timeout
5022 test_bit(THREAD_WAKEUP, &thread->flags)
5023 || kthread_should_stop(),
5026 clear_bit(THREAD_WAKEUP, &thread->flags);
5028 thread->run(thread->mddev);
5034 void md_wakeup_thread(mdk_thread_t *thread)
5037 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5038 set_bit(THREAD_WAKEUP, &thread->flags);
5039 wake_up(&thread->wqueue);
5043 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5046 mdk_thread_t *thread;
5048 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5052 init_waitqueue_head(&thread->wqueue);
5055 thread->mddev = mddev;
5056 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5057 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5058 if (IS_ERR(thread->tsk)) {
5065 void md_unregister_thread(mdk_thread_t *thread)
5067 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5069 kthread_stop(thread->tsk);
5073 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5080 if (!rdev || test_bit(Faulty, &rdev->flags))
5083 if (mddev->external)
5084 set_bit(Blocked, &rdev->flags);
5086 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5088 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5089 __builtin_return_address(0),__builtin_return_address(1),
5090 __builtin_return_address(2),__builtin_return_address(3));
5094 if (!mddev->pers->error_handler)
5096 mddev->pers->error_handler(mddev,rdev);
5097 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5098 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5099 md_wakeup_thread(mddev->thread);
5100 md_new_event_inintr(mddev);
5103 /* seq_file implementation /proc/mdstat */
5105 static void status_unused(struct seq_file *seq)
5109 struct list_head *tmp;
5111 seq_printf(seq, "unused devices: ");
5113 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
5114 char b[BDEVNAME_SIZE];
5116 seq_printf(seq, "%s ",
5117 bdevname(rdev->bdev,b));
5120 seq_printf(seq, "<none>");
5122 seq_printf(seq, "\n");
5126 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5128 sector_t max_blocks, resync, res;
5129 unsigned long dt, db, rt;
5131 unsigned int per_milli;
5133 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5135 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5136 max_blocks = mddev->resync_max_sectors >> 1;
5138 max_blocks = mddev->size;
5141 * Should not happen.
5147 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5148 * in a sector_t, and (max_blocks>>scale) will fit in a
5149 * u32, as those are the requirements for sector_div.
5150 * Thus 'scale' must be at least 10
5153 if (sizeof(sector_t) > sizeof(unsigned long)) {
5154 while ( max_blocks/2 > (1ULL<<(scale+32)))
5157 res = (resync>>scale)*1000;
5158 sector_div(res, (u32)((max_blocks>>scale)+1));
5162 int i, x = per_milli/50, y = 20-x;
5163 seq_printf(seq, "[");
5164 for (i = 0; i < x; i++)
5165 seq_printf(seq, "=");
5166 seq_printf(seq, ">");
5167 for (i = 0; i < y; i++)
5168 seq_printf(seq, ".");
5169 seq_printf(seq, "] ");
5171 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5172 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5174 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5176 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5177 "resync" : "recovery"))),
5178 per_milli/10, per_milli % 10,
5179 (unsigned long long) resync,
5180 (unsigned long long) max_blocks);
5183 * We do not want to overflow, so the order of operands and
5184 * the * 100 / 100 trick are important. We do a +1 to be
5185 * safe against division by zero. We only estimate anyway.
5187 * dt: time from mark until now
5188 * db: blocks written from mark until now
5189 * rt: remaining time
5191 dt = ((jiffies - mddev->resync_mark) / HZ);
5193 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5194 - mddev->resync_mark_cnt;
5195 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5197 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5199 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5202 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5204 struct list_head *tmp;
5214 spin_lock(&all_mddevs_lock);
5215 list_for_each(tmp,&all_mddevs)
5217 mddev = list_entry(tmp, mddev_t, all_mddevs);
5219 spin_unlock(&all_mddevs_lock);
5222 spin_unlock(&all_mddevs_lock);
5224 return (void*)2;/* tail */
5228 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5230 struct list_head *tmp;
5231 mddev_t *next_mddev, *mddev = v;
5237 spin_lock(&all_mddevs_lock);
5239 tmp = all_mddevs.next;
5241 tmp = mddev->all_mddevs.next;
5242 if (tmp != &all_mddevs)
5243 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5245 next_mddev = (void*)2;
5248 spin_unlock(&all_mddevs_lock);
5256 static void md_seq_stop(struct seq_file *seq, void *v)
5260 if (mddev && v != (void*)1 && v != (void*)2)
5264 struct mdstat_info {
5268 static int md_seq_show(struct seq_file *seq, void *v)
5272 struct list_head *tmp2;
5274 struct mdstat_info *mi = seq->private;
5275 struct bitmap *bitmap;
5277 if (v == (void*)1) {
5278 struct mdk_personality *pers;
5279 seq_printf(seq, "Personalities : ");
5280 spin_lock(&pers_lock);
5281 list_for_each_entry(pers, &pers_list, list)
5282 seq_printf(seq, "[%s] ", pers->name);
5284 spin_unlock(&pers_lock);
5285 seq_printf(seq, "\n");
5286 mi->event = atomic_read(&md_event_count);
5289 if (v == (void*)2) {
5294 if (mddev_lock(mddev) < 0)
5297 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5298 seq_printf(seq, "%s : %sactive", mdname(mddev),
5299 mddev->pers ? "" : "in");
5302 seq_printf(seq, " (read-only)");
5304 seq_printf(seq, " (auto-read-only)");
5305 seq_printf(seq, " %s", mddev->pers->name);
5309 rdev_for_each(rdev, tmp2, mddev) {
5310 char b[BDEVNAME_SIZE];
5311 seq_printf(seq, " %s[%d]",
5312 bdevname(rdev->bdev,b), rdev->desc_nr);
5313 if (test_bit(WriteMostly, &rdev->flags))
5314 seq_printf(seq, "(W)");
5315 if (test_bit(Faulty, &rdev->flags)) {
5316 seq_printf(seq, "(F)");
5318 } else if (rdev->raid_disk < 0)
5319 seq_printf(seq, "(S)"); /* spare */
5323 if (!list_empty(&mddev->disks)) {
5325 seq_printf(seq, "\n %llu blocks",
5326 (unsigned long long)mddev->array_size);
5328 seq_printf(seq, "\n %llu blocks",
5329 (unsigned long long)size);
5331 if (mddev->persistent) {
5332 if (mddev->major_version != 0 ||
5333 mddev->minor_version != 90) {
5334 seq_printf(seq," super %d.%d",
5335 mddev->major_version,
5336 mddev->minor_version);
5338 } else if (mddev->external)
5339 seq_printf(seq, " super external:%s",
5340 mddev->metadata_type);
5342 seq_printf(seq, " super non-persistent");
5345 mddev->pers->status (seq, mddev);
5346 seq_printf(seq, "\n ");
5347 if (mddev->pers->sync_request) {
5348 if (mddev->curr_resync > 2) {
5349 status_resync (seq, mddev);
5350 seq_printf(seq, "\n ");
5351 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5352 seq_printf(seq, "\tresync=DELAYED\n ");
5353 else if (mddev->recovery_cp < MaxSector)
5354 seq_printf(seq, "\tresync=PENDING\n ");
5357 seq_printf(seq, "\n ");
5359 if ((bitmap = mddev->bitmap)) {
5360 unsigned long chunk_kb;
5361 unsigned long flags;
5362 spin_lock_irqsave(&bitmap->lock, flags);
5363 chunk_kb = bitmap->chunksize >> 10;
5364 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5366 bitmap->pages - bitmap->missing_pages,
5368 (bitmap->pages - bitmap->missing_pages)
5369 << (PAGE_SHIFT - 10),
5370 chunk_kb ? chunk_kb : bitmap->chunksize,
5371 chunk_kb ? "KB" : "B");
5373 seq_printf(seq, ", file: ");
5374 seq_path(seq, &bitmap->file->f_path, " \t\n");
5377 seq_printf(seq, "\n");
5378 spin_unlock_irqrestore(&bitmap->lock, flags);
5381 seq_printf(seq, "\n");
5383 mddev_unlock(mddev);
5388 static struct seq_operations md_seq_ops = {
5389 .start = md_seq_start,
5390 .next = md_seq_next,
5391 .stop = md_seq_stop,
5392 .show = md_seq_show,
5395 static int md_seq_open(struct inode *inode, struct file *file)
5398 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5402 error = seq_open(file, &md_seq_ops);
5406 struct seq_file *p = file->private_data;
5408 mi->event = atomic_read(&md_event_count);
5413 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5415 struct seq_file *m = filp->private_data;
5416 struct mdstat_info *mi = m->private;
5419 poll_wait(filp, &md_event_waiters, wait);
5421 /* always allow read */
5422 mask = POLLIN | POLLRDNORM;
5424 if (mi->event != atomic_read(&md_event_count))
5425 mask |= POLLERR | POLLPRI;
5429 static const struct file_operations md_seq_fops = {
5430 .owner = THIS_MODULE,
5431 .open = md_seq_open,
5433 .llseek = seq_lseek,
5434 .release = seq_release_private,
5435 .poll = mdstat_poll,
5438 int register_md_personality(struct mdk_personality *p)
5440 spin_lock(&pers_lock);
5441 list_add_tail(&p->list, &pers_list);
5442 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5443 spin_unlock(&pers_lock);
5447 int unregister_md_personality(struct mdk_personality *p)
5449 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5450 spin_lock(&pers_lock);
5451 list_del_init(&p->list);
5452 spin_unlock(&pers_lock);
5456 static int is_mddev_idle(mddev_t *mddev)
5459 struct list_head *tmp;
5464 rdev_for_each(rdev, tmp, mddev) {
5465 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5466 curr_events = disk_stat_read(disk, sectors[0]) +
5467 disk_stat_read(disk, sectors[1]) -
5468 atomic_read(&disk->sync_io);
5469 /* sync IO will cause sync_io to increase before the disk_stats
5470 * as sync_io is counted when a request starts, and
5471 * disk_stats is counted when it completes.
5472 * So resync activity will cause curr_events to be smaller than
5473 * when there was no such activity.
5474 * non-sync IO will cause disk_stat to increase without
5475 * increasing sync_io so curr_events will (eventually)
5476 * be larger than it was before. Once it becomes
5477 * substantially larger, the test below will cause
5478 * the array to appear non-idle, and resync will slow
5480 * If there is a lot of outstanding resync activity when
5481 * we set last_event to curr_events, then all that activity
5482 * completing might cause the array to appear non-idle
5483 * and resync will be slowed down even though there might
5484 * not have been non-resync activity. This will only
5485 * happen once though. 'last_events' will soon reflect
5486 * the state where there is little or no outstanding
5487 * resync requests, and further resync activity will
5488 * always make curr_events less than last_events.
5491 if (curr_events - rdev->last_events > 4096) {
5492 rdev->last_events = curr_events;
5499 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5501 /* another "blocks" (512byte) blocks have been synced */
5502 atomic_sub(blocks, &mddev->recovery_active);
5503 wake_up(&mddev->recovery_wait);
5505 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5506 md_wakeup_thread(mddev->thread);
5507 // stop recovery, signal do_sync ....
5512 /* md_write_start(mddev, bi)
5513 * If we need to update some array metadata (e.g. 'active' flag
5514 * in superblock) before writing, schedule a superblock update
5515 * and wait for it to complete.
5517 void md_write_start(mddev_t *mddev, struct bio *bi)
5519 if (bio_data_dir(bi) != WRITE)
5522 BUG_ON(mddev->ro == 1);
5523 if (mddev->ro == 2) {
5524 /* need to switch to read/write */
5526 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5527 md_wakeup_thread(mddev->thread);
5528 md_wakeup_thread(mddev->sync_thread);
5530 atomic_inc(&mddev->writes_pending);
5531 if (mddev->safemode == 1)
5532 mddev->safemode = 0;
5533 if (mddev->in_sync) {
5534 spin_lock_irq(&mddev->write_lock);
5535 if (mddev->in_sync) {
5537 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5538 md_wakeup_thread(mddev->thread);
5540 spin_unlock_irq(&mddev->write_lock);
5541 sysfs_notify(&mddev->kobj, NULL, "array_state");
5543 wait_event(mddev->sb_wait,
5544 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5545 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5548 void md_write_end(mddev_t *mddev)
5550 if (atomic_dec_and_test(&mddev->writes_pending)) {
5551 if (mddev->safemode == 2)
5552 md_wakeup_thread(mddev->thread);
5553 else if (mddev->safemode_delay)
5554 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5558 /* md_allow_write(mddev)
5559 * Calling this ensures that the array is marked 'active' so that writes
5560 * may proceed without blocking. It is important to call this before
5561 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5562 * Must be called with mddev_lock held.
5564 void md_allow_write(mddev_t *mddev)
5570 if (!mddev->pers->sync_request)
5573 spin_lock_irq(&mddev->write_lock);
5574 if (mddev->in_sync) {
5576 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5577 if (mddev->safemode_delay &&
5578 mddev->safemode == 0)
5579 mddev->safemode = 1;
5580 spin_unlock_irq(&mddev->write_lock);
5581 md_update_sb(mddev, 0);
5583 sysfs_notify(&mddev->kobj, NULL, "array_state");
5584 /* wait for the dirty state to be recorded in the metadata */
5585 wait_event(mddev->sb_wait,
5586 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5587 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5589 spin_unlock_irq(&mddev->write_lock);
5591 EXPORT_SYMBOL_GPL(md_allow_write);
5593 #define SYNC_MARKS 10
5594 #define SYNC_MARK_STEP (3*HZ)
5595 void md_do_sync(mddev_t *mddev)
5598 unsigned int currspeed = 0,
5600 sector_t max_sectors,j, io_sectors;
5601 unsigned long mark[SYNC_MARKS];
5602 sector_t mark_cnt[SYNC_MARKS];
5604 struct list_head *tmp;
5605 sector_t last_check;
5607 struct list_head *rtmp;
5611 /* just incase thread restarts... */
5612 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5614 if (mddev->ro) /* never try to sync a read-only array */
5617 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5618 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5619 desc = "data-check";
5620 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5621 desc = "requested-resync";
5624 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5629 /* we overload curr_resync somewhat here.
5630 * 0 == not engaged in resync at all
5631 * 2 == checking that there is no conflict with another sync
5632 * 1 == like 2, but have yielded to allow conflicting resync to
5634 * other == active in resync - this many blocks
5636 * Before starting a resync we must have set curr_resync to
5637 * 2, and then checked that every "conflicting" array has curr_resync
5638 * less than ours. When we find one that is the same or higher
5639 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5640 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5641 * This will mean we have to start checking from the beginning again.
5646 mddev->curr_resync = 2;
5649 if (kthread_should_stop()) {
5650 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5653 for_each_mddev(mddev2, tmp) {
5654 if (mddev2 == mddev)
5656 if (!mddev->parallel_resync
5657 && mddev2->curr_resync
5658 && match_mddev_units(mddev, mddev2)) {
5660 if (mddev < mddev2 && mddev->curr_resync == 2) {
5661 /* arbitrarily yield */
5662 mddev->curr_resync = 1;
5663 wake_up(&resync_wait);
5665 if (mddev > mddev2 && mddev->curr_resync == 1)
5666 /* no need to wait here, we can wait the next
5667 * time 'round when curr_resync == 2
5670 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5671 if (!kthread_should_stop() &&
5672 mddev2->curr_resync >= mddev->curr_resync) {
5673 printk(KERN_INFO "md: delaying %s of %s"
5674 " until %s has finished (they"
5675 " share one or more physical units)\n",
5676 desc, mdname(mddev), mdname(mddev2));
5679 finish_wait(&resync_wait, &wq);
5682 finish_wait(&resync_wait, &wq);
5685 } while (mddev->curr_resync < 2);
5688 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5689 /* resync follows the size requested by the personality,
5690 * which defaults to physical size, but can be virtual size
5692 max_sectors = mddev->resync_max_sectors;
5693 mddev->resync_mismatches = 0;
5694 /* we don't use the checkpoint if there's a bitmap */
5695 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5696 j = mddev->resync_min;
5697 else if (!mddev->bitmap)
5698 j = mddev->recovery_cp;
5700 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5701 max_sectors = mddev->size << 1;
5703 /* recovery follows the physical size of devices */
5704 max_sectors = mddev->size << 1;
5706 rdev_for_each(rdev, rtmp, mddev)
5707 if (rdev->raid_disk >= 0 &&
5708 !test_bit(Faulty, &rdev->flags) &&
5709 !test_bit(In_sync, &rdev->flags) &&
5710 rdev->recovery_offset < j)
5711 j = rdev->recovery_offset;
5714 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5715 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5716 " %d KB/sec/disk.\n", speed_min(mddev));
5717 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5718 "(but not more than %d KB/sec) for %s.\n",
5719 speed_max(mddev), desc);
5721 is_mddev_idle(mddev); /* this also initializes IO event counters */
5724 for (m = 0; m < SYNC_MARKS; m++) {
5726 mark_cnt[m] = io_sectors;
5729 mddev->resync_mark = mark[last_mark];
5730 mddev->resync_mark_cnt = mark_cnt[last_mark];
5733 * Tune reconstruction:
5735 window = 32*(PAGE_SIZE/512);
5736 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5737 window/2,(unsigned long long) max_sectors/2);
5739 atomic_set(&mddev->recovery_active, 0);
5744 "md: resuming %s of %s from checkpoint.\n",
5745 desc, mdname(mddev));
5746 mddev->curr_resync = j;
5749 while (j < max_sectors) {
5753 if (j >= mddev->resync_max) {
5754 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5755 wait_event(mddev->recovery_wait,
5756 mddev->resync_max > j
5757 || kthread_should_stop());
5759 if (kthread_should_stop())
5761 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5762 currspeed < speed_min(mddev));
5764 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5768 if (!skipped) { /* actual IO requested */
5769 io_sectors += sectors;
5770 atomic_add(sectors, &mddev->recovery_active);
5774 if (j>1) mddev->curr_resync = j;
5775 mddev->curr_mark_cnt = io_sectors;
5776 if (last_check == 0)
5777 /* this is the earliers that rebuilt will be
5778 * visible in /proc/mdstat
5780 md_new_event(mddev);
5782 if (last_check + window > io_sectors || j == max_sectors)
5785 last_check = io_sectors;
5787 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5791 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5793 int next = (last_mark+1) % SYNC_MARKS;
5795 mddev->resync_mark = mark[next];
5796 mddev->resync_mark_cnt = mark_cnt[next];
5797 mark[next] = jiffies;
5798 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5803 if (kthread_should_stop())
5808 * this loop exits only if either when we are slower than
5809 * the 'hard' speed limit, or the system was IO-idle for
5811 * the system might be non-idle CPU-wise, but we only care
5812 * about not overloading the IO subsystem. (things like an
5813 * e2fsck being done on the RAID array should execute fast)
5815 blk_unplug(mddev->queue);
5818 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5819 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5821 if (currspeed > speed_min(mddev)) {
5822 if ((currspeed > speed_max(mddev)) ||
5823 !is_mddev_idle(mddev)) {
5829 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5831 * this also signals 'finished resyncing' to md_stop
5834 blk_unplug(mddev->queue);
5836 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5838 /* tell personality that we are finished */
5839 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5841 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5842 mddev->curr_resync > 2) {
5843 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5844 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5845 if (mddev->curr_resync >= mddev->recovery_cp) {
5847 "md: checkpointing %s of %s.\n",
5848 desc, mdname(mddev));
5849 mddev->recovery_cp = mddev->curr_resync;
5852 mddev->recovery_cp = MaxSector;
5854 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5855 mddev->curr_resync = MaxSector;
5856 rdev_for_each(rdev, rtmp, mddev)
5857 if (rdev->raid_disk >= 0 &&
5858 !test_bit(Faulty, &rdev->flags) &&
5859 !test_bit(In_sync, &rdev->flags) &&
5860 rdev->recovery_offset < mddev->curr_resync)
5861 rdev->recovery_offset = mddev->curr_resync;
5864 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5867 mddev->curr_resync = 0;
5868 mddev->resync_min = 0;
5869 mddev->resync_max = MaxSector;
5870 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5871 wake_up(&resync_wait);
5872 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5873 md_wakeup_thread(mddev->thread);
5878 * got a signal, exit.
5881 "md: md_do_sync() got signal ... exiting\n");
5882 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5886 EXPORT_SYMBOL_GPL(md_do_sync);
5889 static int remove_and_add_spares(mddev_t *mddev)
5892 struct list_head *rtmp;
5895 rdev_for_each(rdev, rtmp, mddev)
5896 if (rdev->raid_disk >= 0 &&
5897 !test_bit(Blocked, &rdev->flags) &&
5898 (test_bit(Faulty, &rdev->flags) ||
5899 ! test_bit(In_sync, &rdev->flags)) &&
5900 atomic_read(&rdev->nr_pending)==0) {
5901 if (mddev->pers->hot_remove_disk(
5902 mddev, rdev->raid_disk)==0) {
5904 sprintf(nm,"rd%d", rdev->raid_disk);
5905 sysfs_remove_link(&mddev->kobj, nm);
5906 rdev->raid_disk = -1;
5910 if (mddev->degraded) {
5911 rdev_for_each(rdev, rtmp, mddev) {
5912 if (rdev->raid_disk >= 0 &&
5913 !test_bit(In_sync, &rdev->flags))
5915 if (rdev->raid_disk < 0
5916 && !test_bit(Faulty, &rdev->flags)) {
5917 rdev->recovery_offset = 0;
5919 hot_add_disk(mddev, rdev) == 0) {
5921 sprintf(nm, "rd%d", rdev->raid_disk);
5922 if (sysfs_create_link(&mddev->kobj,
5925 "md: cannot register "
5929 md_new_event(mddev);
5938 * This routine is regularly called by all per-raid-array threads to
5939 * deal with generic issues like resync and super-block update.
5940 * Raid personalities that don't have a thread (linear/raid0) do not
5941 * need this as they never do any recovery or update the superblock.
5943 * It does not do any resync itself, but rather "forks" off other threads
5944 * to do that as needed.
5945 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5946 * "->recovery" and create a thread at ->sync_thread.
5947 * When the thread finishes it sets MD_RECOVERY_DONE
5948 * and wakeups up this thread which will reap the thread and finish up.
5949 * This thread also removes any faulty devices (with nr_pending == 0).
5951 * The overall approach is:
5952 * 1/ if the superblock needs updating, update it.
5953 * 2/ If a recovery thread is running, don't do anything else.
5954 * 3/ If recovery has finished, clean up, possibly marking spares active.
5955 * 4/ If there are any faulty devices, remove them.
5956 * 5/ If array is degraded, try to add spares devices
5957 * 6/ If array has spares or is not in-sync, start a resync thread.
5959 void md_check_recovery(mddev_t *mddev)
5962 struct list_head *rtmp;
5966 bitmap_daemon_work(mddev->bitmap);
5971 if (signal_pending(current)) {
5972 if (mddev->pers->sync_request && !mddev->external) {
5973 printk(KERN_INFO "md: %s in immediate safe mode\n",
5975 mddev->safemode = 2;
5977 flush_signals(current);
5981 (mddev->flags && !mddev->external) ||
5982 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5983 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5984 (mddev->external == 0 && mddev->safemode == 1) ||
5985 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5986 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5990 if (mddev_trylock(mddev)) {
5993 if (!mddev->external) {
5994 spin_lock_irq(&mddev->write_lock);
5995 if (mddev->safemode &&
5996 !atomic_read(&mddev->writes_pending) &&
5998 mddev->recovery_cp == MaxSector) {
6000 if (mddev->persistent)
6001 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6003 if (mddev->safemode == 1)
6004 mddev->safemode = 0;
6005 spin_unlock_irq(&mddev->write_lock);
6009 md_update_sb(mddev, 0);
6012 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6013 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6014 /* resync/recovery still happening */
6015 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6018 if (mddev->sync_thread) {
6019 /* resync has finished, collect result */
6020 md_unregister_thread(mddev->sync_thread);
6021 mddev->sync_thread = NULL;
6022 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6024 /* activate any spares */
6025 mddev->pers->spare_active(mddev);
6027 md_update_sb(mddev, 1);
6029 /* if array is no-longer degraded, then any saved_raid_disk
6030 * information must be scrapped
6032 if (!mddev->degraded)
6033 rdev_for_each(rdev, rtmp, mddev)
6034 rdev->saved_raid_disk = -1;
6036 mddev->recovery = 0;
6037 /* flag recovery needed just to double check */
6038 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6039 md_new_event(mddev);
6042 /* Clear some bits that don't mean anything, but
6045 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6046 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6047 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6049 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6051 /* no recovery is running.
6052 * remove any failed drives, then
6053 * add spares if possible.
6054 * Spare are also removed and re-added, to allow
6055 * the personality to fail the re-add.
6058 if (mddev->reshape_position != MaxSector) {
6059 if (mddev->pers->check_reshape(mddev) != 0)
6060 /* Cannot proceed */
6062 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6063 } else if ((spares = remove_and_add_spares(mddev))) {
6064 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6065 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6066 } else if (mddev->recovery_cp < MaxSector) {
6067 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6068 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6069 /* nothing to be done ... */
6072 if (mddev->pers->sync_request) {
6073 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6074 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6075 /* We are adding a device or devices to an array
6076 * which has the bitmap stored on all devices.
6077 * So make sure all bitmap pages get written
6079 bitmap_write_all(mddev->bitmap);
6081 mddev->sync_thread = md_register_thread(md_do_sync,
6084 if (!mddev->sync_thread) {
6085 printk(KERN_ERR "%s: could not start resync"
6088 /* leave the spares where they are, it shouldn't hurt */
6089 mddev->recovery = 0;
6091 md_wakeup_thread(mddev->sync_thread);
6092 md_new_event(mddev);
6095 mddev_unlock(mddev);
6099 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6101 sysfs_notify(&rdev->kobj, NULL, "state");
6102 wait_event_timeout(rdev->blocked_wait,
6103 !test_bit(Blocked, &rdev->flags),
6104 msecs_to_jiffies(5000));
6105 rdev_dec_pending(rdev, mddev);
6107 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6109 static int md_notify_reboot(struct notifier_block *this,
6110 unsigned long code, void *x)
6112 struct list_head *tmp;
6115 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6117 printk(KERN_INFO "md: stopping all md devices.\n");
6119 for_each_mddev(mddev, tmp)
6120 if (mddev_trylock(mddev)) {
6121 do_md_stop (mddev, 1);
6122 mddev_unlock(mddev);
6125 * certain more exotic SCSI devices are known to be
6126 * volatile wrt too early system reboots. While the
6127 * right place to handle this issue is the given
6128 * driver, we do want to have a safe RAID driver ...
6135 static struct notifier_block md_notifier = {
6136 .notifier_call = md_notify_reboot,
6138 .priority = INT_MAX, /* before any real devices */
6141 static void md_geninit(void)
6143 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6145 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6148 static int __init md_init(void)
6150 if (register_blkdev(MAJOR_NR, "md"))
6152 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6153 unregister_blkdev(MAJOR_NR, "md");
6156 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6157 md_probe, NULL, NULL);
6158 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6159 md_probe, NULL, NULL);
6161 register_reboot_notifier(&md_notifier);
6162 raid_table_header = register_sysctl_table(raid_root_table);
6172 * Searches all registered partitions for autorun RAID arrays
6176 static LIST_HEAD(all_detected_devices);
6177 struct detected_devices_node {
6178 struct list_head list;
6182 void md_autodetect_dev(dev_t dev)
6184 struct detected_devices_node *node_detected_dev;
6186 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6187 if (node_detected_dev) {
6188 node_detected_dev->dev = dev;
6189 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6191 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6192 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6197 static void autostart_arrays(int part)
6200 struct detected_devices_node *node_detected_dev;
6202 int i_scanned, i_passed;
6207 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6209 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6211 node_detected_dev = list_entry(all_detected_devices.next,
6212 struct detected_devices_node, list);
6213 list_del(&node_detected_dev->list);
6214 dev = node_detected_dev->dev;
6215 kfree(node_detected_dev);
6216 rdev = md_import_device(dev,0, 90);
6220 if (test_bit(Faulty, &rdev->flags)) {
6224 set_bit(AutoDetected, &rdev->flags);
6225 list_add(&rdev->same_set, &pending_raid_disks);
6229 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6230 i_scanned, i_passed);
6232 autorun_devices(part);
6235 #endif /* !MODULE */
6237 static __exit void md_exit(void)
6240 struct list_head *tmp;
6242 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6243 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6245 unregister_blkdev(MAJOR_NR,"md");
6246 unregister_blkdev(mdp_major, "mdp");
6247 unregister_reboot_notifier(&md_notifier);
6248 unregister_sysctl_table(raid_table_header);
6249 remove_proc_entry("mdstat", NULL);
6250 for_each_mddev(mddev, tmp) {
6251 struct gendisk *disk = mddev->gendisk;
6254 export_array(mddev);
6257 mddev->gendisk = NULL;
6262 subsys_initcall(md_init);
6263 module_exit(md_exit)
6265 static int get_ro(char *buffer, struct kernel_param *kp)
6267 return sprintf(buffer, "%d", start_readonly);
6269 static int set_ro(const char *val, struct kernel_param *kp)
6272 int num = simple_strtoul(val, &e, 10);
6273 if (*val && (*e == '\0' || *e == '\n')) {
6274 start_readonly = num;
6280 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6281 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6284 EXPORT_SYMBOL(register_md_personality);
6285 EXPORT_SYMBOL(unregister_md_personality);
6286 EXPORT_SYMBOL(md_error);
6287 EXPORT_SYMBOL(md_done_sync);
6288 EXPORT_SYMBOL(md_write_start);
6289 EXPORT_SYMBOL(md_write_end);
6290 EXPORT_SYMBOL(md_register_thread);
6291 EXPORT_SYMBOL(md_unregister_thread);
6292 EXPORT_SYMBOL(md_wakeup_thread);
6293 EXPORT_SYMBOL(md_check_recovery);
6294 MODULE_LICENSE("GPL");
6296 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);