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);
173 EXPORT_SYMBOL_GPL(md_new_event);
175 /* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
178 static void md_new_event_inintr(mddev_t *mddev)
180 atomic_inc(&md_event_count);
181 wake_up(&md_event_waiters);
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
188 static LIST_HEAD(all_mddevs);
189 static DEFINE_SPINLOCK(all_mddevs_lock);
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
199 #define for_each_mddev(mddev,tmp) \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
215 static int md_fail_request (struct request_queue *q, struct bio *bio)
221 static inline mddev_t *mddev_get(mddev_t *mddev)
223 atomic_inc(&mddev->active);
227 static void mddev_put(mddev_t *mddev)
229 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
231 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
232 list_del(&mddev->all_mddevs);
233 spin_unlock(&all_mddevs_lock);
234 blk_cleanup_queue(mddev->queue);
235 kobject_put(&mddev->kobj);
237 spin_unlock(&all_mddevs_lock);
240 static mddev_t * mddev_find(dev_t unit)
242 mddev_t *mddev, *new = NULL;
245 spin_lock(&all_mddevs_lock);
246 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
247 if (mddev->unit == unit) {
249 spin_unlock(&all_mddevs_lock);
255 list_add(&new->all_mddevs, &all_mddevs);
256 spin_unlock(&all_mddevs_lock);
259 spin_unlock(&all_mddevs_lock);
261 new = kzalloc(sizeof(*new), GFP_KERNEL);
266 if (MAJOR(unit) == MD_MAJOR)
267 new->md_minor = MINOR(unit);
269 new->md_minor = MINOR(unit) >> MdpMinorShift;
271 mutex_init(&new->reconfig_mutex);
272 INIT_LIST_HEAD(&new->disks);
273 INIT_LIST_HEAD(&new->all_mddevs);
274 init_timer(&new->safemode_timer);
275 atomic_set(&new->active, 1);
276 spin_lock_init(&new->write_lock);
277 init_waitqueue_head(&new->sb_wait);
278 init_waitqueue_head(&new->recovery_wait);
279 new->reshape_position = MaxSector;
281 new->resync_max = MaxSector;
282 new->level = LEVEL_NONE;
284 new->queue = blk_alloc_queue(GFP_KERNEL);
289 /* Can be unlocked because the queue is new: no concurrency */
290 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
292 blk_queue_make_request(new->queue, md_fail_request);
297 static inline int mddev_lock(mddev_t * mddev)
299 return mutex_lock_interruptible(&mddev->reconfig_mutex);
302 static inline int mddev_trylock(mddev_t * mddev)
304 return mutex_trylock(&mddev->reconfig_mutex);
307 static inline void mddev_unlock(mddev_t * mddev)
309 mutex_unlock(&mddev->reconfig_mutex);
311 md_wakeup_thread(mddev->thread);
314 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
317 struct list_head *tmp;
319 rdev_for_each(rdev, tmp, mddev) {
320 if (rdev->desc_nr == nr)
326 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
328 struct list_head *tmp;
331 rdev_for_each(rdev, tmp, mddev) {
332 if (rdev->bdev->bd_dev == dev)
338 static struct mdk_personality *find_pers(int level, char *clevel)
340 struct mdk_personality *pers;
341 list_for_each_entry(pers, &pers_list, list) {
342 if (level != LEVEL_NONE && pers->level == level)
344 if (strcmp(pers->name, clevel)==0)
350 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
352 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
353 return MD_NEW_SIZE_BLOCKS(size);
356 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
360 size = rdev->sb_offset;
363 size &= ~((sector_t)chunk_size/1024 - 1);
367 static int alloc_disk_sb(mdk_rdev_t * rdev)
372 rdev->sb_page = alloc_page(GFP_KERNEL);
373 if (!rdev->sb_page) {
374 printk(KERN_ALERT "md: out of memory.\n");
381 static void free_disk_sb(mdk_rdev_t * rdev)
384 put_page(rdev->sb_page);
386 rdev->sb_page = NULL;
393 static void super_written(struct bio *bio, int error)
395 mdk_rdev_t *rdev = bio->bi_private;
396 mddev_t *mddev = rdev->mddev;
398 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
399 printk("md: super_written gets error=%d, uptodate=%d\n",
400 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
401 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
402 md_error(mddev, rdev);
405 if (atomic_dec_and_test(&mddev->pending_writes))
406 wake_up(&mddev->sb_wait);
410 static void super_written_barrier(struct bio *bio, int error)
412 struct bio *bio2 = bio->bi_private;
413 mdk_rdev_t *rdev = bio2->bi_private;
414 mddev_t *mddev = rdev->mddev;
416 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
417 error == -EOPNOTSUPP) {
419 /* barriers don't appear to be supported :-( */
420 set_bit(BarriersNotsupp, &rdev->flags);
421 mddev->barriers_work = 0;
422 spin_lock_irqsave(&mddev->write_lock, flags);
423 bio2->bi_next = mddev->biolist;
424 mddev->biolist = bio2;
425 spin_unlock_irqrestore(&mddev->write_lock, flags);
426 wake_up(&mddev->sb_wait);
430 bio->bi_private = rdev;
431 super_written(bio, error);
435 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
436 sector_t sector, int size, struct page *page)
438 /* write first size bytes of page to sector of rdev
439 * Increment mddev->pending_writes before returning
440 * and decrement it on completion, waking up sb_wait
441 * if zero is reached.
442 * If an error occurred, call md_error
444 * As we might need to resubmit the request if BIO_RW_BARRIER
445 * causes ENOTSUPP, we allocate a spare bio...
447 struct bio *bio = bio_alloc(GFP_NOIO, 1);
448 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
450 bio->bi_bdev = rdev->bdev;
451 bio->bi_sector = sector;
452 bio_add_page(bio, page, size, 0);
453 bio->bi_private = rdev;
454 bio->bi_end_io = super_written;
457 atomic_inc(&mddev->pending_writes);
458 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
460 rw |= (1<<BIO_RW_BARRIER);
461 rbio = bio_clone(bio, GFP_NOIO);
462 rbio->bi_private = bio;
463 rbio->bi_end_io = super_written_barrier;
464 submit_bio(rw, rbio);
469 void md_super_wait(mddev_t *mddev)
471 /* wait for all superblock writes that were scheduled to complete.
472 * if any had to be retried (due to BARRIER problems), retry them
476 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
477 if (atomic_read(&mddev->pending_writes)==0)
479 while (mddev->biolist) {
481 spin_lock_irq(&mddev->write_lock);
482 bio = mddev->biolist;
483 mddev->biolist = bio->bi_next ;
485 spin_unlock_irq(&mddev->write_lock);
486 submit_bio(bio->bi_rw, bio);
490 finish_wait(&mddev->sb_wait, &wq);
493 static void bi_complete(struct bio *bio, int error)
495 complete((struct completion*)bio->bi_private);
498 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
499 struct page *page, int rw)
501 struct bio *bio = bio_alloc(GFP_NOIO, 1);
502 struct completion event;
505 rw |= (1 << BIO_RW_SYNC);
508 bio->bi_sector = sector;
509 bio_add_page(bio, page, size, 0);
510 init_completion(&event);
511 bio->bi_private = &event;
512 bio->bi_end_io = bi_complete;
514 wait_for_completion(&event);
516 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
520 EXPORT_SYMBOL_GPL(sync_page_io);
522 static int read_disk_sb(mdk_rdev_t * rdev, int size)
524 char b[BDEVNAME_SIZE];
525 if (!rdev->sb_page) {
533 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
539 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
540 bdevname(rdev->bdev,b));
544 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
546 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
547 (sb1->set_uuid1 == sb2->set_uuid1) &&
548 (sb1->set_uuid2 == sb2->set_uuid2) &&
549 (sb1->set_uuid3 == sb2->set_uuid3))
557 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
560 mdp_super_t *tmp1, *tmp2;
562 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
563 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
565 if (!tmp1 || !tmp2) {
567 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
575 * nr_disks is not constant
580 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
592 static u32 md_csum_fold(u32 csum)
594 csum = (csum & 0xffff) + (csum >> 16);
595 return (csum & 0xffff) + (csum >> 16);
598 static unsigned int calc_sb_csum(mdp_super_t * sb)
601 u32 *sb32 = (u32*)sb;
603 unsigned int disk_csum, csum;
605 disk_csum = sb->sb_csum;
608 for (i = 0; i < MD_SB_BYTES/4 ; i++)
610 csum = (newcsum & 0xffffffff) + (newcsum>>32);
614 /* This used to use csum_partial, which was wrong for several
615 * reasons including that different results are returned on
616 * different architectures. It isn't critical that we get exactly
617 * the same return value as before (we always csum_fold before
618 * testing, and that removes any differences). However as we
619 * know that csum_partial always returned a 16bit value on
620 * alphas, do a fold to maximise conformity to previous behaviour.
622 sb->sb_csum = md_csum_fold(disk_csum);
624 sb->sb_csum = disk_csum;
631 * Handle superblock details.
632 * We want to be able to handle multiple superblock formats
633 * so we have a common interface to them all, and an array of
634 * different handlers.
635 * We rely on user-space to write the initial superblock, and support
636 * reading and updating of superblocks.
637 * Interface methods are:
638 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
639 * loads and validates a superblock on dev.
640 * if refdev != NULL, compare superblocks on both devices
642 * 0 - dev has a superblock that is compatible with refdev
643 * 1 - dev has a superblock that is compatible and newer than refdev
644 * so dev should be used as the refdev in future
645 * -EINVAL superblock incompatible or invalid
646 * -othererror e.g. -EIO
648 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
649 * Verify that dev is acceptable into mddev.
650 * The first time, mddev->raid_disks will be 0, and data from
651 * dev should be merged in. Subsequent calls check that dev
652 * is new enough. Return 0 or -EINVAL
654 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
655 * Update the superblock for rdev with data in mddev
656 * This does not write to disc.
662 struct module *owner;
663 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
664 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
665 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
669 * load_super for 0.90.0
671 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
673 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
679 * Calculate the position of the superblock,
680 * it's at the end of the disk.
682 * It also happens to be a multiple of 4Kb.
684 sb_offset = calc_dev_sboffset(rdev->bdev);
685 rdev->sb_offset = sb_offset;
687 ret = read_disk_sb(rdev, MD_SB_BYTES);
692 bdevname(rdev->bdev, b);
693 sb = (mdp_super_t*)page_address(rdev->sb_page);
695 if (sb->md_magic != MD_SB_MAGIC) {
696 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
701 if (sb->major_version != 0 ||
702 sb->minor_version < 90 ||
703 sb->minor_version > 91) {
704 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
705 sb->major_version, sb->minor_version,
710 if (sb->raid_disks <= 0)
713 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
714 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
719 rdev->preferred_minor = sb->md_minor;
720 rdev->data_offset = 0;
721 rdev->sb_size = MD_SB_BYTES;
723 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
724 if (sb->level != 1 && sb->level != 4
725 && sb->level != 5 && sb->level != 6
726 && sb->level != 10) {
727 /* FIXME use a better test */
729 "md: bitmaps not supported for this level.\n");
734 if (sb->level == LEVEL_MULTIPATH)
737 rdev->desc_nr = sb->this_disk.number;
743 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
744 if (!uuid_equal(refsb, sb)) {
745 printk(KERN_WARNING "md: %s has different UUID to %s\n",
746 b, bdevname(refdev->bdev,b2));
749 if (!sb_equal(refsb, sb)) {
750 printk(KERN_WARNING "md: %s has same UUID"
751 " but different superblock to %s\n",
752 b, bdevname(refdev->bdev, b2));
756 ev2 = md_event(refsb);
762 rdev->size = calc_dev_size(rdev, sb->chunk_size);
764 if (rdev->size < sb->size && sb->level > 1)
765 /* "this cannot possibly happen" ... */
773 * validate_super for 0.90.0
775 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
778 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
779 __u64 ev1 = md_event(sb);
781 rdev->raid_disk = -1;
782 clear_bit(Faulty, &rdev->flags);
783 clear_bit(In_sync, &rdev->flags);
784 clear_bit(WriteMostly, &rdev->flags);
785 clear_bit(BarriersNotsupp, &rdev->flags);
787 if (mddev->raid_disks == 0) {
788 mddev->major_version = 0;
789 mddev->minor_version = sb->minor_version;
790 mddev->patch_version = sb->patch_version;
792 mddev->chunk_size = sb->chunk_size;
793 mddev->ctime = sb->ctime;
794 mddev->utime = sb->utime;
795 mddev->level = sb->level;
796 mddev->clevel[0] = 0;
797 mddev->layout = sb->layout;
798 mddev->raid_disks = sb->raid_disks;
799 mddev->size = sb->size;
801 mddev->bitmap_offset = 0;
802 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
804 if (mddev->minor_version >= 91) {
805 mddev->reshape_position = sb->reshape_position;
806 mddev->delta_disks = sb->delta_disks;
807 mddev->new_level = sb->new_level;
808 mddev->new_layout = sb->new_layout;
809 mddev->new_chunk = sb->new_chunk;
811 mddev->reshape_position = MaxSector;
812 mddev->delta_disks = 0;
813 mddev->new_level = mddev->level;
814 mddev->new_layout = mddev->layout;
815 mddev->new_chunk = mddev->chunk_size;
818 if (sb->state & (1<<MD_SB_CLEAN))
819 mddev->recovery_cp = MaxSector;
821 if (sb->events_hi == sb->cp_events_hi &&
822 sb->events_lo == sb->cp_events_lo) {
823 mddev->recovery_cp = sb->recovery_cp;
825 mddev->recovery_cp = 0;
828 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
829 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
830 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
831 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
833 mddev->max_disks = MD_SB_DISKS;
835 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
836 mddev->bitmap_file == NULL)
837 mddev->bitmap_offset = mddev->default_bitmap_offset;
839 } else if (mddev->pers == NULL) {
840 /* Insist on good event counter while assembling */
842 if (ev1 < mddev->events)
844 } else if (mddev->bitmap) {
845 /* if adding to array with a bitmap, then we can accept an
846 * older device ... but not too old.
848 if (ev1 < mddev->bitmap->events_cleared)
851 if (ev1 < mddev->events)
852 /* just a hot-add of a new device, leave raid_disk at -1 */
856 if (mddev->level != LEVEL_MULTIPATH) {
857 desc = sb->disks + rdev->desc_nr;
859 if (desc->state & (1<<MD_DISK_FAULTY))
860 set_bit(Faulty, &rdev->flags);
861 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
862 desc->raid_disk < mddev->raid_disks */) {
863 set_bit(In_sync, &rdev->flags);
864 rdev->raid_disk = desc->raid_disk;
866 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
867 set_bit(WriteMostly, &rdev->flags);
868 } else /* MULTIPATH are always insync */
869 set_bit(In_sync, &rdev->flags);
874 * sync_super for 0.90.0
876 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
879 struct list_head *tmp;
881 int next_spare = mddev->raid_disks;
884 /* make rdev->sb match mddev data..
887 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
888 * 3/ any empty disks < next_spare become removed
890 * disks[0] gets initialised to REMOVED because
891 * we cannot be sure from other fields if it has
892 * been initialised or not.
895 int active=0, working=0,failed=0,spare=0,nr_disks=0;
897 rdev->sb_size = MD_SB_BYTES;
899 sb = (mdp_super_t*)page_address(rdev->sb_page);
901 memset(sb, 0, sizeof(*sb));
903 sb->md_magic = MD_SB_MAGIC;
904 sb->major_version = mddev->major_version;
905 sb->patch_version = mddev->patch_version;
906 sb->gvalid_words = 0; /* ignored */
907 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
908 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
909 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
910 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
912 sb->ctime = mddev->ctime;
913 sb->level = mddev->level;
914 sb->size = mddev->size;
915 sb->raid_disks = mddev->raid_disks;
916 sb->md_minor = mddev->md_minor;
917 sb->not_persistent = 0;
918 sb->utime = mddev->utime;
920 sb->events_hi = (mddev->events>>32);
921 sb->events_lo = (u32)mddev->events;
923 if (mddev->reshape_position == MaxSector)
924 sb->minor_version = 90;
926 sb->minor_version = 91;
927 sb->reshape_position = mddev->reshape_position;
928 sb->new_level = mddev->new_level;
929 sb->delta_disks = mddev->delta_disks;
930 sb->new_layout = mddev->new_layout;
931 sb->new_chunk = mddev->new_chunk;
933 mddev->minor_version = sb->minor_version;
936 sb->recovery_cp = mddev->recovery_cp;
937 sb->cp_events_hi = (mddev->events>>32);
938 sb->cp_events_lo = (u32)mddev->events;
939 if (mddev->recovery_cp == MaxSector)
940 sb->state = (1<< MD_SB_CLEAN);
944 sb->layout = mddev->layout;
945 sb->chunk_size = mddev->chunk_size;
947 if (mddev->bitmap && mddev->bitmap_file == NULL)
948 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
950 sb->disks[0].state = (1<<MD_DISK_REMOVED);
951 rdev_for_each(rdev2, tmp, mddev) {
954 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
955 && !test_bit(Faulty, &rdev2->flags))
956 desc_nr = rdev2->raid_disk;
958 desc_nr = next_spare++;
959 rdev2->desc_nr = desc_nr;
960 d = &sb->disks[rdev2->desc_nr];
962 d->number = rdev2->desc_nr;
963 d->major = MAJOR(rdev2->bdev->bd_dev);
964 d->minor = MINOR(rdev2->bdev->bd_dev);
965 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
966 && !test_bit(Faulty, &rdev2->flags))
967 d->raid_disk = rdev2->raid_disk;
969 d->raid_disk = rdev2->desc_nr; /* compatibility */
970 if (test_bit(Faulty, &rdev2->flags))
971 d->state = (1<<MD_DISK_FAULTY);
972 else if (test_bit(In_sync, &rdev2->flags)) {
973 d->state = (1<<MD_DISK_ACTIVE);
974 d->state |= (1<<MD_DISK_SYNC);
982 if (test_bit(WriteMostly, &rdev2->flags))
983 d->state |= (1<<MD_DISK_WRITEMOSTLY);
985 /* now set the "removed" and "faulty" bits on any missing devices */
986 for (i=0 ; i < mddev->raid_disks ; i++) {
987 mdp_disk_t *d = &sb->disks[i];
988 if (d->state == 0 && d->number == 0) {
991 d->state = (1<<MD_DISK_REMOVED);
992 d->state |= (1<<MD_DISK_FAULTY);
996 sb->nr_disks = nr_disks;
997 sb->active_disks = active;
998 sb->working_disks = working;
999 sb->failed_disks = failed;
1000 sb->spare_disks = spare;
1002 sb->this_disk = sb->disks[rdev->desc_nr];
1003 sb->sb_csum = calc_sb_csum(sb);
1007 * version 1 superblock
1010 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1014 unsigned long long newcsum;
1015 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1016 __le32 *isuper = (__le32*)sb;
1019 disk_csum = sb->sb_csum;
1022 for (i=0; size>=4; size -= 4 )
1023 newcsum += le32_to_cpu(*isuper++);
1026 newcsum += le16_to_cpu(*(__le16*) isuper);
1028 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1029 sb->sb_csum = disk_csum;
1030 return cpu_to_le32(csum);
1033 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1035 struct mdp_superblock_1 *sb;
1038 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1042 * Calculate the position of the superblock.
1043 * It is always aligned to a 4K boundary and
1044 * depeding on minor_version, it can be:
1045 * 0: At least 8K, but less than 12K, from end of device
1046 * 1: At start of device
1047 * 2: 4K from start of device.
1049 switch(minor_version) {
1051 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1053 sb_offset &= ~(sector_t)(4*2-1);
1054 /* convert from sectors to K */
1066 rdev->sb_offset = sb_offset;
1068 /* superblock is rarely larger than 1K, but it can be larger,
1069 * and it is safe to read 4k, so we do that
1071 ret = read_disk_sb(rdev, 4096);
1072 if (ret) return ret;
1075 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1077 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1078 sb->major_version != cpu_to_le32(1) ||
1079 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1080 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1081 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1084 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1085 printk("md: invalid superblock checksum on %s\n",
1086 bdevname(rdev->bdev,b));
1089 if (le64_to_cpu(sb->data_size) < 10) {
1090 printk("md: data_size too small on %s\n",
1091 bdevname(rdev->bdev,b));
1094 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1095 if (sb->level != cpu_to_le32(1) &&
1096 sb->level != cpu_to_le32(4) &&
1097 sb->level != cpu_to_le32(5) &&
1098 sb->level != cpu_to_le32(6) &&
1099 sb->level != cpu_to_le32(10)) {
1101 "md: bitmaps not supported for this level.\n");
1106 rdev->preferred_minor = 0xffff;
1107 rdev->data_offset = le64_to_cpu(sb->data_offset);
1108 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1110 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1111 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1112 if (rdev->sb_size & bmask)
1113 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1116 && rdev->data_offset < sb_offset + (rdev->sb_size/512))
1119 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1122 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1128 struct mdp_superblock_1 *refsb =
1129 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1131 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1132 sb->level != refsb->level ||
1133 sb->layout != refsb->layout ||
1134 sb->chunksize != refsb->chunksize) {
1135 printk(KERN_WARNING "md: %s has strangely different"
1136 " superblock to %s\n",
1137 bdevname(rdev->bdev,b),
1138 bdevname(refdev->bdev,b2));
1141 ev1 = le64_to_cpu(sb->events);
1142 ev2 = le64_to_cpu(refsb->events);
1150 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1152 rdev->size = rdev->sb_offset;
1153 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1155 rdev->size = le64_to_cpu(sb->data_size)/2;
1156 if (le32_to_cpu(sb->chunksize))
1157 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1159 if (le64_to_cpu(sb->size) > rdev->size*2)
1164 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1166 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1167 __u64 ev1 = le64_to_cpu(sb->events);
1169 rdev->raid_disk = -1;
1170 clear_bit(Faulty, &rdev->flags);
1171 clear_bit(In_sync, &rdev->flags);
1172 clear_bit(WriteMostly, &rdev->flags);
1173 clear_bit(BarriersNotsupp, &rdev->flags);
1175 if (mddev->raid_disks == 0) {
1176 mddev->major_version = 1;
1177 mddev->patch_version = 0;
1178 mddev->external = 0;
1179 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1180 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1181 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1182 mddev->level = le32_to_cpu(sb->level);
1183 mddev->clevel[0] = 0;
1184 mddev->layout = le32_to_cpu(sb->layout);
1185 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1186 mddev->size = le64_to_cpu(sb->size)/2;
1187 mddev->events = ev1;
1188 mddev->bitmap_offset = 0;
1189 mddev->default_bitmap_offset = 1024 >> 9;
1191 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1192 memcpy(mddev->uuid, sb->set_uuid, 16);
1194 mddev->max_disks = (4096-256)/2;
1196 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1197 mddev->bitmap_file == NULL )
1198 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1200 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1201 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1202 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1203 mddev->new_level = le32_to_cpu(sb->new_level);
1204 mddev->new_layout = le32_to_cpu(sb->new_layout);
1205 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1207 mddev->reshape_position = MaxSector;
1208 mddev->delta_disks = 0;
1209 mddev->new_level = mddev->level;
1210 mddev->new_layout = mddev->layout;
1211 mddev->new_chunk = mddev->chunk_size;
1214 } else if (mddev->pers == NULL) {
1215 /* Insist of good event counter while assembling */
1217 if (ev1 < mddev->events)
1219 } else if (mddev->bitmap) {
1220 /* If adding to array with a bitmap, then we can accept an
1221 * older device, but not too old.
1223 if (ev1 < mddev->bitmap->events_cleared)
1226 if (ev1 < mddev->events)
1227 /* just a hot-add of a new device, leave raid_disk at -1 */
1230 if (mddev->level != LEVEL_MULTIPATH) {
1232 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1234 case 0xffff: /* spare */
1236 case 0xfffe: /* faulty */
1237 set_bit(Faulty, &rdev->flags);
1240 if ((le32_to_cpu(sb->feature_map) &
1241 MD_FEATURE_RECOVERY_OFFSET))
1242 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1244 set_bit(In_sync, &rdev->flags);
1245 rdev->raid_disk = role;
1248 if (sb->devflags & WriteMostly1)
1249 set_bit(WriteMostly, &rdev->flags);
1250 } else /* MULTIPATH are always insync */
1251 set_bit(In_sync, &rdev->flags);
1256 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1258 struct mdp_superblock_1 *sb;
1259 struct list_head *tmp;
1262 /* make rdev->sb match mddev and rdev data. */
1264 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1266 sb->feature_map = 0;
1268 sb->recovery_offset = cpu_to_le64(0);
1269 memset(sb->pad1, 0, sizeof(sb->pad1));
1270 memset(sb->pad2, 0, sizeof(sb->pad2));
1271 memset(sb->pad3, 0, sizeof(sb->pad3));
1273 sb->utime = cpu_to_le64((__u64)mddev->utime);
1274 sb->events = cpu_to_le64(mddev->events);
1276 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1278 sb->resync_offset = cpu_to_le64(0);
1280 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1282 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1283 sb->size = cpu_to_le64(mddev->size<<1);
1285 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1286 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1287 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1290 if (rdev->raid_disk >= 0 &&
1291 !test_bit(In_sync, &rdev->flags) &&
1292 rdev->recovery_offset > 0) {
1293 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1294 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1297 if (mddev->reshape_position != MaxSector) {
1298 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1299 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1300 sb->new_layout = cpu_to_le32(mddev->new_layout);
1301 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1302 sb->new_level = cpu_to_le32(mddev->new_level);
1303 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1307 rdev_for_each(rdev2, tmp, mddev)
1308 if (rdev2->desc_nr+1 > max_dev)
1309 max_dev = rdev2->desc_nr+1;
1311 if (max_dev > le32_to_cpu(sb->max_dev))
1312 sb->max_dev = cpu_to_le32(max_dev);
1313 for (i=0; i<max_dev;i++)
1314 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1316 rdev_for_each(rdev2, tmp, mddev) {
1318 if (test_bit(Faulty, &rdev2->flags))
1319 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1320 else if (test_bit(In_sync, &rdev2->flags))
1321 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1322 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1323 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1325 sb->dev_roles[i] = cpu_to_le16(0xffff);
1328 sb->sb_csum = calc_sb_1_csum(sb);
1332 static struct super_type super_types[] = {
1335 .owner = THIS_MODULE,
1336 .load_super = super_90_load,
1337 .validate_super = super_90_validate,
1338 .sync_super = super_90_sync,
1342 .owner = THIS_MODULE,
1343 .load_super = super_1_load,
1344 .validate_super = super_1_validate,
1345 .sync_super = super_1_sync,
1349 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1351 struct list_head *tmp, *tmp2;
1352 mdk_rdev_t *rdev, *rdev2;
1354 rdev_for_each(rdev, tmp, mddev1)
1355 rdev_for_each(rdev2, tmp2, mddev2)
1356 if (rdev->bdev->bd_contains ==
1357 rdev2->bdev->bd_contains)
1363 static LIST_HEAD(pending_raid_disks);
1365 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1367 char b[BDEVNAME_SIZE];
1377 /* prevent duplicates */
1378 if (find_rdev(mddev, rdev->bdev->bd_dev))
1381 /* make sure rdev->size exceeds mddev->size */
1382 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1384 /* Cannot change size, so fail
1385 * If mddev->level <= 0, then we don't care
1386 * about aligning sizes (e.g. linear)
1388 if (mddev->level > 0)
1391 mddev->size = rdev->size;
1394 /* Verify rdev->desc_nr is unique.
1395 * If it is -1, assign a free number, else
1396 * check number is not in use
1398 if (rdev->desc_nr < 0) {
1400 if (mddev->pers) choice = mddev->raid_disks;
1401 while (find_rdev_nr(mddev, choice))
1403 rdev->desc_nr = choice;
1405 if (find_rdev_nr(mddev, rdev->desc_nr))
1408 bdevname(rdev->bdev,b);
1409 while ( (s=strchr(b, '/')) != NULL)
1412 rdev->mddev = mddev;
1413 printk(KERN_INFO "md: bind<%s>\n", b);
1415 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1418 if (rdev->bdev->bd_part)
1419 ko = &rdev->bdev->bd_part->dev.kobj;
1421 ko = &rdev->bdev->bd_disk->dev.kobj;
1422 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1423 kobject_del(&rdev->kobj);
1426 list_add(&rdev->same_set, &mddev->disks);
1427 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1431 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1436 static void md_delayed_delete(struct work_struct *ws)
1438 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1439 kobject_del(&rdev->kobj);
1440 kobject_put(&rdev->kobj);
1443 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1445 char b[BDEVNAME_SIZE];
1450 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1451 list_del_init(&rdev->same_set);
1452 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1454 sysfs_remove_link(&rdev->kobj, "block");
1456 /* We need to delay this, otherwise we can deadlock when
1457 * writing to 'remove' to "dev/state"
1459 INIT_WORK(&rdev->del_work, md_delayed_delete);
1460 kobject_get(&rdev->kobj);
1461 schedule_work(&rdev->del_work);
1465 * prevent the device from being mounted, repartitioned or
1466 * otherwise reused by a RAID array (or any other kernel
1467 * subsystem), by bd_claiming the device.
1469 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1472 struct block_device *bdev;
1473 char b[BDEVNAME_SIZE];
1475 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1477 printk(KERN_ERR "md: could not open %s.\n",
1478 __bdevname(dev, b));
1479 return PTR_ERR(bdev);
1481 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1483 printk(KERN_ERR "md: could not bd_claim %s.\n",
1489 set_bit(AllReserved, &rdev->flags);
1494 static void unlock_rdev(mdk_rdev_t *rdev)
1496 struct block_device *bdev = rdev->bdev;
1504 void md_autodetect_dev(dev_t dev);
1506 static void export_rdev(mdk_rdev_t * rdev)
1508 char b[BDEVNAME_SIZE];
1509 printk(KERN_INFO "md: export_rdev(%s)\n",
1510 bdevname(rdev->bdev,b));
1514 list_del_init(&rdev->same_set);
1516 if (test_bit(AutoDetected, &rdev->flags))
1517 md_autodetect_dev(rdev->bdev->bd_dev);
1520 kobject_put(&rdev->kobj);
1523 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1525 unbind_rdev_from_array(rdev);
1529 static void export_array(mddev_t *mddev)
1531 struct list_head *tmp;
1534 rdev_for_each(rdev, tmp, mddev) {
1539 kick_rdev_from_array(rdev);
1541 if (!list_empty(&mddev->disks))
1543 mddev->raid_disks = 0;
1544 mddev->major_version = 0;
1547 static void print_desc(mdp_disk_t *desc)
1549 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1550 desc->major,desc->minor,desc->raid_disk,desc->state);
1553 static void print_sb(mdp_super_t *sb)
1558 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1559 sb->major_version, sb->minor_version, sb->patch_version,
1560 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1562 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1563 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1564 sb->md_minor, sb->layout, sb->chunk_size);
1565 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1566 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1567 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1568 sb->failed_disks, sb->spare_disks,
1569 sb->sb_csum, (unsigned long)sb->events_lo);
1572 for (i = 0; i < MD_SB_DISKS; i++) {
1575 desc = sb->disks + i;
1576 if (desc->number || desc->major || desc->minor ||
1577 desc->raid_disk || (desc->state && (desc->state != 4))) {
1578 printk(" D %2d: ", i);
1582 printk(KERN_INFO "md: THIS: ");
1583 print_desc(&sb->this_disk);
1587 static void print_rdev(mdk_rdev_t *rdev)
1589 char b[BDEVNAME_SIZE];
1590 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1591 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1592 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1594 if (rdev->sb_loaded) {
1595 printk(KERN_INFO "md: rdev superblock:\n");
1596 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1598 printk(KERN_INFO "md: no rdev superblock!\n");
1601 static void md_print_devices(void)
1603 struct list_head *tmp, *tmp2;
1606 char b[BDEVNAME_SIZE];
1609 printk("md: **********************************\n");
1610 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1611 printk("md: **********************************\n");
1612 for_each_mddev(mddev, tmp) {
1615 bitmap_print_sb(mddev->bitmap);
1617 printk("%s: ", mdname(mddev));
1618 rdev_for_each(rdev, tmp2, mddev)
1619 printk("<%s>", bdevname(rdev->bdev,b));
1622 rdev_for_each(rdev, tmp2, mddev)
1625 printk("md: **********************************\n");
1630 static void sync_sbs(mddev_t * mddev, int nospares)
1632 /* Update each superblock (in-memory image), but
1633 * if we are allowed to, skip spares which already
1634 * have the right event counter, or have one earlier
1635 * (which would mean they aren't being marked as dirty
1636 * with the rest of the array)
1639 struct list_head *tmp;
1641 rdev_for_each(rdev, tmp, mddev) {
1642 if (rdev->sb_events == mddev->events ||
1644 rdev->raid_disk < 0 &&
1645 (rdev->sb_events&1)==0 &&
1646 rdev->sb_events+1 == mddev->events)) {
1647 /* Don't update this superblock */
1648 rdev->sb_loaded = 2;
1650 super_types[mddev->major_version].
1651 sync_super(mddev, rdev);
1652 rdev->sb_loaded = 1;
1657 static void md_update_sb(mddev_t * mddev, int force_change)
1659 struct list_head *tmp;
1664 if (mddev->external)
1667 spin_lock_irq(&mddev->write_lock);
1669 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1670 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1672 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1673 /* just a clean<-> dirty transition, possibly leave spares alone,
1674 * though if events isn't the right even/odd, we will have to do
1680 if (mddev->degraded)
1681 /* If the array is degraded, then skipping spares is both
1682 * dangerous and fairly pointless.
1683 * Dangerous because a device that was removed from the array
1684 * might have a event_count that still looks up-to-date,
1685 * so it can be re-added without a resync.
1686 * Pointless because if there are any spares to skip,
1687 * then a recovery will happen and soon that array won't
1688 * be degraded any more and the spare can go back to sleep then.
1692 sync_req = mddev->in_sync;
1693 mddev->utime = get_seconds();
1695 /* If this is just a dirty<->clean transition, and the array is clean
1696 * and 'events' is odd, we can roll back to the previous clean state */
1698 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1699 && (mddev->events & 1)
1700 && mddev->events != 1)
1703 /* otherwise we have to go forward and ... */
1705 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1706 /* .. if the array isn't clean, insist on an odd 'events' */
1707 if ((mddev->events&1)==0) {
1712 /* otherwise insist on an even 'events' (for clean states) */
1713 if ((mddev->events&1)) {
1720 if (!mddev->events) {
1722 * oops, this 64-bit counter should never wrap.
1723 * Either we are in around ~1 trillion A.C., assuming
1724 * 1 reboot per second, or we have a bug:
1731 * do not write anything to disk if using
1732 * nonpersistent superblocks
1734 if (!mddev->persistent) {
1735 if (!mddev->external)
1736 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1738 spin_unlock_irq(&mddev->write_lock);
1739 wake_up(&mddev->sb_wait);
1742 sync_sbs(mddev, nospares);
1743 spin_unlock_irq(&mddev->write_lock);
1746 "md: updating %s RAID superblock on device (in sync %d)\n",
1747 mdname(mddev),mddev->in_sync);
1749 bitmap_update_sb(mddev->bitmap);
1750 rdev_for_each(rdev, tmp, mddev) {
1751 char b[BDEVNAME_SIZE];
1752 dprintk(KERN_INFO "md: ");
1753 if (rdev->sb_loaded != 1)
1754 continue; /* no noise on spare devices */
1755 if (test_bit(Faulty, &rdev->flags))
1756 dprintk("(skipping faulty ");
1758 dprintk("%s ", bdevname(rdev->bdev,b));
1759 if (!test_bit(Faulty, &rdev->flags)) {
1760 md_super_write(mddev,rdev,
1761 rdev->sb_offset<<1, rdev->sb_size,
1763 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1764 bdevname(rdev->bdev,b),
1765 (unsigned long long)rdev->sb_offset);
1766 rdev->sb_events = mddev->events;
1770 if (mddev->level == LEVEL_MULTIPATH)
1771 /* only need to write one superblock... */
1774 md_super_wait(mddev);
1775 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1777 spin_lock_irq(&mddev->write_lock);
1778 if (mddev->in_sync != sync_req ||
1779 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1780 /* have to write it out again */
1781 spin_unlock_irq(&mddev->write_lock);
1784 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1785 spin_unlock_irq(&mddev->write_lock);
1786 wake_up(&mddev->sb_wait);
1790 /* words written to sysfs files may, or my not, be \n terminated.
1791 * We want to accept with case. For this we use cmd_match.
1793 static int cmd_match(const char *cmd, const char *str)
1795 /* See if cmd, written into a sysfs file, matches
1796 * str. They must either be the same, or cmd can
1797 * have a trailing newline
1799 while (*cmd && *str && *cmd == *str) {
1810 struct rdev_sysfs_entry {
1811 struct attribute attr;
1812 ssize_t (*show)(mdk_rdev_t *, char *);
1813 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1817 state_show(mdk_rdev_t *rdev, char *page)
1822 if (test_bit(Faulty, &rdev->flags)) {
1823 len+= sprintf(page+len, "%sfaulty",sep);
1826 if (test_bit(In_sync, &rdev->flags)) {
1827 len += sprintf(page+len, "%sin_sync",sep);
1830 if (test_bit(WriteMostly, &rdev->flags)) {
1831 len += sprintf(page+len, "%swrite_mostly",sep);
1834 if (test_bit(Blocked, &rdev->flags)) {
1835 len += sprintf(page+len, "%sblocked", sep);
1838 if (!test_bit(Faulty, &rdev->flags) &&
1839 !test_bit(In_sync, &rdev->flags)) {
1840 len += sprintf(page+len, "%sspare", sep);
1843 return len+sprintf(page+len, "\n");
1847 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1850 * faulty - simulates and error
1851 * remove - disconnects the device
1852 * writemostly - sets write_mostly
1853 * -writemostly - clears write_mostly
1854 * blocked - sets the Blocked flag
1855 * -blocked - clears the Blocked flag
1858 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1859 md_error(rdev->mddev, rdev);
1861 } else if (cmd_match(buf, "remove")) {
1862 if (rdev->raid_disk >= 0)
1865 mddev_t *mddev = rdev->mddev;
1866 kick_rdev_from_array(rdev);
1868 md_update_sb(mddev, 1);
1869 md_new_event(mddev);
1872 } else if (cmd_match(buf, "writemostly")) {
1873 set_bit(WriteMostly, &rdev->flags);
1875 } else if (cmd_match(buf, "-writemostly")) {
1876 clear_bit(WriteMostly, &rdev->flags);
1878 } else if (cmd_match(buf, "blocked")) {
1879 set_bit(Blocked, &rdev->flags);
1881 } else if (cmd_match(buf, "-blocked")) {
1882 clear_bit(Blocked, &rdev->flags);
1883 wake_up(&rdev->blocked_wait);
1884 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1885 md_wakeup_thread(rdev->mddev->thread);
1890 sysfs_notify(&rdev->kobj, NULL, "state");
1891 return err ? err : len;
1893 static struct rdev_sysfs_entry rdev_state =
1894 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1897 errors_show(mdk_rdev_t *rdev, char *page)
1899 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1903 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1906 unsigned long n = simple_strtoul(buf, &e, 10);
1907 if (*buf && (*e == 0 || *e == '\n')) {
1908 atomic_set(&rdev->corrected_errors, n);
1913 static struct rdev_sysfs_entry rdev_errors =
1914 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1917 slot_show(mdk_rdev_t *rdev, char *page)
1919 if (rdev->raid_disk < 0)
1920 return sprintf(page, "none\n");
1922 return sprintf(page, "%d\n", rdev->raid_disk);
1926 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1931 int slot = simple_strtoul(buf, &e, 10);
1932 if (strncmp(buf, "none", 4)==0)
1934 else if (e==buf || (*e && *e!= '\n'))
1936 if (rdev->mddev->pers && slot == -1) {
1937 /* Setting 'slot' on an active array requires also
1938 * updating the 'rd%d' link, and communicating
1939 * with the personality with ->hot_*_disk.
1940 * For now we only support removing
1941 * failed/spare devices. This normally happens automatically,
1942 * but not when the metadata is externally managed.
1944 if (rdev->raid_disk == -1)
1946 /* personality does all needed checks */
1947 if (rdev->mddev->pers->hot_add_disk == NULL)
1949 err = rdev->mddev->pers->
1950 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1953 sprintf(nm, "rd%d", rdev->raid_disk);
1954 sysfs_remove_link(&rdev->mddev->kobj, nm);
1955 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1956 md_wakeup_thread(rdev->mddev->thread);
1957 } else if (rdev->mddev->pers) {
1959 struct list_head *tmp;
1960 /* Activating a spare .. or possibly reactivating
1961 * if we every get bitmaps working here.
1964 if (rdev->raid_disk != -1)
1967 if (rdev->mddev->pers->hot_add_disk == NULL)
1970 rdev_for_each(rdev2, tmp, rdev->mddev)
1971 if (rdev2->raid_disk == slot)
1974 rdev->raid_disk = slot;
1975 if (test_bit(In_sync, &rdev->flags))
1976 rdev->saved_raid_disk = slot;
1978 rdev->saved_raid_disk = -1;
1979 err = rdev->mddev->pers->
1980 hot_add_disk(rdev->mddev, rdev);
1982 rdev->raid_disk = -1;
1985 sysfs_notify(&rdev->kobj, NULL, "state");
1986 sprintf(nm, "rd%d", rdev->raid_disk);
1987 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
1989 "md: cannot register "
1991 nm, mdname(rdev->mddev));
1993 /* don't wakeup anyone, leave that to userspace. */
1995 if (slot >= rdev->mddev->raid_disks)
1997 rdev->raid_disk = slot;
1998 /* assume it is working */
1999 clear_bit(Faulty, &rdev->flags);
2000 clear_bit(WriteMostly, &rdev->flags);
2001 set_bit(In_sync, &rdev->flags);
2002 sysfs_notify(&rdev->kobj, NULL, "state");
2008 static struct rdev_sysfs_entry rdev_slot =
2009 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2012 offset_show(mdk_rdev_t *rdev, char *page)
2014 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2018 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2021 unsigned long long offset = simple_strtoull(buf, &e, 10);
2022 if (e==buf || (*e && *e != '\n'))
2024 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2026 if (rdev->size && rdev->mddev->external)
2027 /* Must set offset before size, so overlap checks
2030 rdev->data_offset = offset;
2034 static struct rdev_sysfs_entry rdev_offset =
2035 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2038 rdev_size_show(mdk_rdev_t *rdev, char *page)
2040 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2043 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2045 /* check if two start/length pairs overlap */
2054 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2057 unsigned long long size = simple_strtoull(buf, &e, 10);
2058 unsigned long long oldsize = rdev->size;
2059 mddev_t *my_mddev = rdev->mddev;
2061 if (e==buf || (*e && *e != '\n'))
2063 if (my_mddev->pers && rdev->raid_disk >= 0)
2066 if (size > oldsize && rdev->mddev->external) {
2067 /* need to check that all other rdevs with the same ->bdev
2068 * do not overlap. We need to unlock the mddev to avoid
2069 * a deadlock. We have already changed rdev->size, and if
2070 * we have to change it back, we will have the lock again.
2074 struct list_head *tmp, *tmp2;
2076 mddev_unlock(my_mddev);
2077 for_each_mddev(mddev, tmp) {
2081 rdev_for_each(rdev2, tmp2, mddev)
2082 if (test_bit(AllReserved, &rdev2->flags) ||
2083 (rdev->bdev == rdev2->bdev &&
2085 overlaps(rdev->data_offset, rdev->size,
2086 rdev2->data_offset, rdev2->size))) {
2090 mddev_unlock(mddev);
2096 mddev_lock(my_mddev);
2098 /* Someone else could have slipped in a size
2099 * change here, but doing so is just silly.
2100 * We put oldsize back because we *know* it is
2101 * safe, and trust userspace not to race with
2104 rdev->size = oldsize;
2108 if (size < my_mddev->size || my_mddev->size == 0)
2109 my_mddev->size = size;
2113 static struct rdev_sysfs_entry rdev_size =
2114 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2116 static struct attribute *rdev_default_attrs[] = {
2125 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2127 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2128 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2129 mddev_t *mddev = rdev->mddev;
2135 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2137 if (rdev->mddev == NULL)
2140 rv = entry->show(rdev, page);
2141 mddev_unlock(mddev);
2147 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2148 const char *page, size_t length)
2150 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2151 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2153 mddev_t *mddev = rdev->mddev;
2157 if (!capable(CAP_SYS_ADMIN))
2159 rv = mddev ? mddev_lock(mddev): -EBUSY;
2161 if (rdev->mddev == NULL)
2164 rv = entry->store(rdev, page, length);
2165 mddev_unlock(mddev);
2170 static void rdev_free(struct kobject *ko)
2172 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2175 static struct sysfs_ops rdev_sysfs_ops = {
2176 .show = rdev_attr_show,
2177 .store = rdev_attr_store,
2179 static struct kobj_type rdev_ktype = {
2180 .release = rdev_free,
2181 .sysfs_ops = &rdev_sysfs_ops,
2182 .default_attrs = rdev_default_attrs,
2186 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2188 * mark the device faulty if:
2190 * - the device is nonexistent (zero size)
2191 * - the device has no valid superblock
2193 * a faulty rdev _never_ has rdev->sb set.
2195 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2197 char b[BDEVNAME_SIZE];
2202 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2204 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2205 return ERR_PTR(-ENOMEM);
2208 if ((err = alloc_disk_sb(rdev)))
2211 err = lock_rdev(rdev, newdev, super_format == -2);
2215 kobject_init(&rdev->kobj, &rdev_ktype);
2218 rdev->saved_raid_disk = -1;
2219 rdev->raid_disk = -1;
2221 rdev->data_offset = 0;
2222 rdev->sb_events = 0;
2223 atomic_set(&rdev->nr_pending, 0);
2224 atomic_set(&rdev->read_errors, 0);
2225 atomic_set(&rdev->corrected_errors, 0);
2227 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2230 "md: %s has zero or unknown size, marking faulty!\n",
2231 bdevname(rdev->bdev,b));
2236 if (super_format >= 0) {
2237 err = super_types[super_format].
2238 load_super(rdev, NULL, super_minor);
2239 if (err == -EINVAL) {
2241 "md: %s does not have a valid v%d.%d "
2242 "superblock, not importing!\n",
2243 bdevname(rdev->bdev,b),
2244 super_format, super_minor);
2249 "md: could not read %s's sb, not importing!\n",
2250 bdevname(rdev->bdev,b));
2255 INIT_LIST_HEAD(&rdev->same_set);
2256 init_waitqueue_head(&rdev->blocked_wait);
2261 if (rdev->sb_page) {
2267 return ERR_PTR(err);
2271 * Check a full RAID array for plausibility
2275 static void analyze_sbs(mddev_t * mddev)
2278 struct list_head *tmp;
2279 mdk_rdev_t *rdev, *freshest;
2280 char b[BDEVNAME_SIZE];
2283 rdev_for_each(rdev, tmp, mddev)
2284 switch (super_types[mddev->major_version].
2285 load_super(rdev, freshest, mddev->minor_version)) {
2293 "md: fatal superblock inconsistency in %s"
2294 " -- removing from array\n",
2295 bdevname(rdev->bdev,b));
2296 kick_rdev_from_array(rdev);
2300 super_types[mddev->major_version].
2301 validate_super(mddev, freshest);
2304 rdev_for_each(rdev, tmp, mddev) {
2305 if (rdev != freshest)
2306 if (super_types[mddev->major_version].
2307 validate_super(mddev, rdev)) {
2308 printk(KERN_WARNING "md: kicking non-fresh %s"
2310 bdevname(rdev->bdev,b));
2311 kick_rdev_from_array(rdev);
2314 if (mddev->level == LEVEL_MULTIPATH) {
2315 rdev->desc_nr = i++;
2316 rdev->raid_disk = rdev->desc_nr;
2317 set_bit(In_sync, &rdev->flags);
2318 } else if (rdev->raid_disk >= mddev->raid_disks) {
2319 rdev->raid_disk = -1;
2320 clear_bit(In_sync, &rdev->flags);
2326 if (mddev->recovery_cp != MaxSector &&
2328 printk(KERN_ERR "md: %s: raid array is not clean"
2329 " -- starting background reconstruction\n",
2335 safe_delay_show(mddev_t *mddev, char *page)
2337 int msec = (mddev->safemode_delay*1000)/HZ;
2338 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2341 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2349 /* remove a period, and count digits after it */
2350 if (len >= sizeof(buf))
2352 strlcpy(buf, cbuf, len);
2354 for (i=0; i<len; i++) {
2356 if (isdigit(buf[i])) {
2361 } else if (buf[i] == '.') {
2366 msec = simple_strtoul(buf, &e, 10);
2367 if (e == buf || (*e && *e != '\n'))
2369 msec = (msec * 1000) / scale;
2371 mddev->safemode_delay = 0;
2373 mddev->safemode_delay = (msec*HZ)/1000;
2374 if (mddev->safemode_delay == 0)
2375 mddev->safemode_delay = 1;
2379 static struct md_sysfs_entry md_safe_delay =
2380 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2383 level_show(mddev_t *mddev, char *page)
2385 struct mdk_personality *p = mddev->pers;
2387 return sprintf(page, "%s\n", p->name);
2388 else if (mddev->clevel[0])
2389 return sprintf(page, "%s\n", mddev->clevel);
2390 else if (mddev->level != LEVEL_NONE)
2391 return sprintf(page, "%d\n", mddev->level);
2397 level_store(mddev_t *mddev, const char *buf, size_t len)
2404 if (len >= sizeof(mddev->clevel))
2406 strncpy(mddev->clevel, buf, len);
2407 if (mddev->clevel[len-1] == '\n')
2409 mddev->clevel[len] = 0;
2410 mddev->level = LEVEL_NONE;
2414 static struct md_sysfs_entry md_level =
2415 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2419 layout_show(mddev_t *mddev, char *page)
2421 /* just a number, not meaningful for all levels */
2422 if (mddev->reshape_position != MaxSector &&
2423 mddev->layout != mddev->new_layout)
2424 return sprintf(page, "%d (%d)\n",
2425 mddev->new_layout, mddev->layout);
2426 return sprintf(page, "%d\n", mddev->layout);
2430 layout_store(mddev_t *mddev, const char *buf, size_t len)
2433 unsigned long n = simple_strtoul(buf, &e, 10);
2435 if (!*buf || (*e && *e != '\n'))
2440 if (mddev->reshape_position != MaxSector)
2441 mddev->new_layout = n;
2446 static struct md_sysfs_entry md_layout =
2447 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2451 raid_disks_show(mddev_t *mddev, char *page)
2453 if (mddev->raid_disks == 0)
2455 if (mddev->reshape_position != MaxSector &&
2456 mddev->delta_disks != 0)
2457 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2458 mddev->raid_disks - mddev->delta_disks);
2459 return sprintf(page, "%d\n", mddev->raid_disks);
2462 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2465 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2469 unsigned long n = simple_strtoul(buf, &e, 10);
2471 if (!*buf || (*e && *e != '\n'))
2475 rv = update_raid_disks(mddev, n);
2476 else if (mddev->reshape_position != MaxSector) {
2477 int olddisks = mddev->raid_disks - mddev->delta_disks;
2478 mddev->delta_disks = n - olddisks;
2479 mddev->raid_disks = n;
2481 mddev->raid_disks = n;
2482 return rv ? rv : len;
2484 static struct md_sysfs_entry md_raid_disks =
2485 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2488 chunk_size_show(mddev_t *mddev, char *page)
2490 if (mddev->reshape_position != MaxSector &&
2491 mddev->chunk_size != mddev->new_chunk)
2492 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2494 return sprintf(page, "%d\n", mddev->chunk_size);
2498 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2500 /* can only set chunk_size if array is not yet active */
2502 unsigned long n = simple_strtoul(buf, &e, 10);
2504 if (!*buf || (*e && *e != '\n'))
2509 else if (mddev->reshape_position != MaxSector)
2510 mddev->new_chunk = n;
2512 mddev->chunk_size = n;
2515 static struct md_sysfs_entry md_chunk_size =
2516 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2519 resync_start_show(mddev_t *mddev, char *page)
2521 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2525 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2528 unsigned long long n = simple_strtoull(buf, &e, 10);
2532 if (!*buf || (*e && *e != '\n'))
2535 mddev->recovery_cp = n;
2538 static struct md_sysfs_entry md_resync_start =
2539 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2542 * The array state can be:
2545 * No devices, no size, no level
2546 * Equivalent to STOP_ARRAY ioctl
2548 * May have some settings, but array is not active
2549 * all IO results in error
2550 * When written, doesn't tear down array, but just stops it
2551 * suspended (not supported yet)
2552 * All IO requests will block. The array can be reconfigured.
2553 * Writing this, if accepted, will block until array is quiessent
2555 * no resync can happen. no superblocks get written.
2556 * write requests fail
2558 * like readonly, but behaves like 'clean' on a write request.
2560 * clean - no pending writes, but otherwise active.
2561 * When written to inactive array, starts without resync
2562 * If a write request arrives then
2563 * if metadata is known, mark 'dirty' and switch to 'active'.
2564 * if not known, block and switch to write-pending
2565 * If written to an active array that has pending writes, then fails.
2567 * fully active: IO and resync can be happening.
2568 * When written to inactive array, starts with resync
2571 * clean, but writes are blocked waiting for 'active' to be written.
2574 * like active, but no writes have been seen for a while (100msec).
2577 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2578 write_pending, active_idle, bad_word};
2579 static char *array_states[] = {
2580 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2581 "write-pending", "active-idle", NULL };
2583 static int match_word(const char *word, char **list)
2586 for (n=0; list[n]; n++)
2587 if (cmd_match(word, list[n]))
2593 array_state_show(mddev_t *mddev, char *page)
2595 enum array_state st = inactive;
2608 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2610 else if (mddev->safemode)
2616 if (list_empty(&mddev->disks) &&
2617 mddev->raid_disks == 0 &&
2623 return sprintf(page, "%s\n", array_states[st]);
2626 static int do_md_stop(mddev_t * mddev, int ro);
2627 static int do_md_run(mddev_t * mddev);
2628 static int restart_array(mddev_t *mddev);
2631 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2634 enum array_state st = match_word(buf, array_states);
2639 /* stopping an active array */
2640 if (atomic_read(&mddev->active) > 1)
2642 err = do_md_stop(mddev, 0);
2645 /* stopping an active array */
2647 if (atomic_read(&mddev->active) > 1)
2649 err = do_md_stop(mddev, 2);
2651 err = 0; /* already inactive */
2654 break; /* not supported yet */
2657 err = do_md_stop(mddev, 1);
2660 set_disk_ro(mddev->gendisk, 1);
2661 err = do_md_run(mddev);
2667 err = do_md_stop(mddev, 1);
2669 err = restart_array(mddev);
2672 set_disk_ro(mddev->gendisk, 0);
2676 err = do_md_run(mddev);
2681 restart_array(mddev);
2682 spin_lock_irq(&mddev->write_lock);
2683 if (atomic_read(&mddev->writes_pending) == 0) {
2684 if (mddev->in_sync == 0) {
2686 if (mddev->safemode == 1)
2687 mddev->safemode = 0;
2688 if (mddev->persistent)
2689 set_bit(MD_CHANGE_CLEAN,
2695 spin_unlock_irq(&mddev->write_lock);
2698 mddev->recovery_cp = MaxSector;
2699 err = do_md_run(mddev);
2704 restart_array(mddev);
2705 if (mddev->external)
2706 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2707 wake_up(&mddev->sb_wait);
2711 set_disk_ro(mddev->gendisk, 0);
2712 err = do_md_run(mddev);
2717 /* these cannot be set */
2723 sysfs_notify(&mddev->kobj, NULL, "array_state");
2727 static struct md_sysfs_entry md_array_state =
2728 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2731 null_show(mddev_t *mddev, char *page)
2737 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2739 /* buf must be %d:%d\n? giving major and minor numbers */
2740 /* The new device is added to the array.
2741 * If the array has a persistent superblock, we read the
2742 * superblock to initialise info and check validity.
2743 * Otherwise, only checking done is that in bind_rdev_to_array,
2744 * which mainly checks size.
2747 int major = simple_strtoul(buf, &e, 10);
2753 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2755 minor = simple_strtoul(e+1, &e, 10);
2756 if (*e && *e != '\n')
2758 dev = MKDEV(major, minor);
2759 if (major != MAJOR(dev) ||
2760 minor != MINOR(dev))
2764 if (mddev->persistent) {
2765 rdev = md_import_device(dev, mddev->major_version,
2766 mddev->minor_version);
2767 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2768 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2769 mdk_rdev_t, same_set);
2770 err = super_types[mddev->major_version]
2771 .load_super(rdev, rdev0, mddev->minor_version);
2775 } else if (mddev->external)
2776 rdev = md_import_device(dev, -2, -1);
2778 rdev = md_import_device(dev, -1, -1);
2781 return PTR_ERR(rdev);
2782 err = bind_rdev_to_array(rdev, mddev);
2786 return err ? err : len;
2789 static struct md_sysfs_entry md_new_device =
2790 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2793 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2796 unsigned long chunk, end_chunk;
2800 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2802 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2803 if (buf == end) break;
2804 if (*end == '-') { /* range */
2806 end_chunk = simple_strtoul(buf, &end, 0);
2807 if (buf == end) break;
2809 if (*end && !isspace(*end)) break;
2810 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2812 while (isspace(*buf)) buf++;
2814 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2819 static struct md_sysfs_entry md_bitmap =
2820 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2823 size_show(mddev_t *mddev, char *page)
2825 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2828 static int update_size(mddev_t *mddev, unsigned long size);
2831 size_store(mddev_t *mddev, const char *buf, size_t len)
2833 /* If array is inactive, we can reduce the component size, but
2834 * not increase it (except from 0).
2835 * If array is active, we can try an on-line resize
2839 unsigned long long size = simple_strtoull(buf, &e, 10);
2840 if (!*buf || *buf == '\n' ||
2845 err = update_size(mddev, size);
2846 md_update_sb(mddev, 1);
2848 if (mddev->size == 0 ||
2854 return err ? err : len;
2857 static struct md_sysfs_entry md_size =
2858 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2863 * 'none' for arrays with no metadata (good luck...)
2864 * 'external' for arrays with externally managed metadata,
2865 * or N.M for internally known formats
2868 metadata_show(mddev_t *mddev, char *page)
2870 if (mddev->persistent)
2871 return sprintf(page, "%d.%d\n",
2872 mddev->major_version, mddev->minor_version);
2873 else if (mddev->external)
2874 return sprintf(page, "external:%s\n", mddev->metadata_type);
2876 return sprintf(page, "none\n");
2880 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2884 if (!list_empty(&mddev->disks))
2887 if (cmd_match(buf, "none")) {
2888 mddev->persistent = 0;
2889 mddev->external = 0;
2890 mddev->major_version = 0;
2891 mddev->minor_version = 90;
2894 if (strncmp(buf, "external:", 9) == 0) {
2895 size_t namelen = len-9;
2896 if (namelen >= sizeof(mddev->metadata_type))
2897 namelen = sizeof(mddev->metadata_type)-1;
2898 strncpy(mddev->metadata_type, buf+9, namelen);
2899 mddev->metadata_type[namelen] = 0;
2900 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2901 mddev->metadata_type[--namelen] = 0;
2902 mddev->persistent = 0;
2903 mddev->external = 1;
2904 mddev->major_version = 0;
2905 mddev->minor_version = 90;
2908 major = simple_strtoul(buf, &e, 10);
2909 if (e==buf || *e != '.')
2912 minor = simple_strtoul(buf, &e, 10);
2913 if (e==buf || (*e && *e != '\n') )
2915 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2917 mddev->major_version = major;
2918 mddev->minor_version = minor;
2919 mddev->persistent = 1;
2920 mddev->external = 0;
2924 static struct md_sysfs_entry md_metadata =
2925 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2928 action_show(mddev_t *mddev, char *page)
2930 char *type = "idle";
2931 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2932 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2933 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2935 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2936 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2938 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2942 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
2945 return sprintf(page, "%s\n", type);
2949 action_store(mddev_t *mddev, const char *page, size_t len)
2951 if (!mddev->pers || !mddev->pers->sync_request)
2954 if (cmd_match(page, "idle")) {
2955 if (mddev->sync_thread) {
2956 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2957 md_unregister_thread(mddev->sync_thread);
2958 mddev->sync_thread = NULL;
2959 mddev->recovery = 0;
2961 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2962 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2964 else if (cmd_match(page, "resync"))
2965 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2966 else if (cmd_match(page, "recover")) {
2967 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
2968 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2969 } else if (cmd_match(page, "reshape")) {
2971 if (mddev->pers->start_reshape == NULL)
2973 err = mddev->pers->start_reshape(mddev);
2976 sysfs_notify(&mddev->kobj, NULL, "degraded");
2978 if (cmd_match(page, "check"))
2979 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2980 else if (!cmd_match(page, "repair"))
2982 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2983 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2985 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2986 md_wakeup_thread(mddev->thread);
2987 sysfs_notify(&mddev->kobj, NULL, "sync_action");
2992 mismatch_cnt_show(mddev_t *mddev, char *page)
2994 return sprintf(page, "%llu\n",
2995 (unsigned long long) mddev->resync_mismatches);
2998 static struct md_sysfs_entry md_scan_mode =
2999 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3002 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3005 sync_min_show(mddev_t *mddev, char *page)
3007 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3008 mddev->sync_speed_min ? "local": "system");
3012 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3016 if (strncmp(buf, "system", 6)==0) {
3017 mddev->sync_speed_min = 0;
3020 min = simple_strtoul(buf, &e, 10);
3021 if (buf == e || (*e && *e != '\n') || min <= 0)
3023 mddev->sync_speed_min = min;
3027 static struct md_sysfs_entry md_sync_min =
3028 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3031 sync_max_show(mddev_t *mddev, char *page)
3033 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3034 mddev->sync_speed_max ? "local": "system");
3038 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3042 if (strncmp(buf, "system", 6)==0) {
3043 mddev->sync_speed_max = 0;
3046 max = simple_strtoul(buf, &e, 10);
3047 if (buf == e || (*e && *e != '\n') || max <= 0)
3049 mddev->sync_speed_max = max;
3053 static struct md_sysfs_entry md_sync_max =
3054 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3057 degraded_show(mddev_t *mddev, char *page)
3059 return sprintf(page, "%d\n", mddev->degraded);
3061 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3064 sync_force_parallel_show(mddev_t *mddev, char *page)
3066 return sprintf(page, "%d\n", mddev->parallel_resync);
3070 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3074 if (strict_strtol(buf, 10, &n))
3077 if (n != 0 && n != 1)
3080 mddev->parallel_resync = n;
3082 if (mddev->sync_thread)
3083 wake_up(&resync_wait);
3088 /* force parallel resync, even with shared block devices */
3089 static struct md_sysfs_entry md_sync_force_parallel =
3090 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3091 sync_force_parallel_show, sync_force_parallel_store);
3094 sync_speed_show(mddev_t *mddev, char *page)
3096 unsigned long resync, dt, db;
3097 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
3098 dt = ((jiffies - mddev->resync_mark) / HZ);
3100 db = resync - (mddev->resync_mark_cnt);
3101 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
3104 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3107 sync_completed_show(mddev_t *mddev, char *page)
3109 unsigned long max_blocks, resync;
3111 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3112 max_blocks = mddev->resync_max_sectors;
3114 max_blocks = mddev->size << 1;
3116 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3117 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3120 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3123 min_sync_show(mddev_t *mddev, char *page)
3125 return sprintf(page, "%llu\n",
3126 (unsigned long long)mddev->resync_min);
3129 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3131 unsigned long long min;
3132 if (strict_strtoull(buf, 10, &min))
3134 if (min > mddev->resync_max)
3136 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3139 /* Must be a multiple of chunk_size */
3140 if (mddev->chunk_size) {
3141 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3144 mddev->resync_min = min;
3149 static struct md_sysfs_entry md_min_sync =
3150 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3153 max_sync_show(mddev_t *mddev, char *page)
3155 if (mddev->resync_max == MaxSector)
3156 return sprintf(page, "max\n");
3158 return sprintf(page, "%llu\n",
3159 (unsigned long long)mddev->resync_max);
3162 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3164 if (strncmp(buf, "max", 3) == 0)
3165 mddev->resync_max = MaxSector;
3167 unsigned long long max;
3168 if (strict_strtoull(buf, 10, &max))
3170 if (max < mddev->resync_min)
3172 if (max < mddev->resync_max &&
3173 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3176 /* Must be a multiple of chunk_size */
3177 if (mddev->chunk_size) {
3178 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3181 mddev->resync_max = max;
3183 wake_up(&mddev->recovery_wait);
3187 static struct md_sysfs_entry md_max_sync =
3188 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3191 suspend_lo_show(mddev_t *mddev, char *page)
3193 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3197 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3200 unsigned long long new = simple_strtoull(buf, &e, 10);
3202 if (mddev->pers->quiesce == NULL)
3204 if (buf == e || (*e && *e != '\n'))
3206 if (new >= mddev->suspend_hi ||
3207 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3208 mddev->suspend_lo = new;
3209 mddev->pers->quiesce(mddev, 2);
3214 static struct md_sysfs_entry md_suspend_lo =
3215 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3219 suspend_hi_show(mddev_t *mddev, char *page)
3221 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3225 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3228 unsigned long long new = simple_strtoull(buf, &e, 10);
3230 if (mddev->pers->quiesce == NULL)
3232 if (buf == e || (*e && *e != '\n'))
3234 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3235 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3236 mddev->suspend_hi = new;
3237 mddev->pers->quiesce(mddev, 1);
3238 mddev->pers->quiesce(mddev, 0);
3243 static struct md_sysfs_entry md_suspend_hi =
3244 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3247 reshape_position_show(mddev_t *mddev, char *page)
3249 if (mddev->reshape_position != MaxSector)
3250 return sprintf(page, "%llu\n",
3251 (unsigned long long)mddev->reshape_position);
3252 strcpy(page, "none\n");
3257 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3260 unsigned long long new = simple_strtoull(buf, &e, 10);
3263 if (buf == e || (*e && *e != '\n'))
3265 mddev->reshape_position = new;
3266 mddev->delta_disks = 0;
3267 mddev->new_level = mddev->level;
3268 mddev->new_layout = mddev->layout;
3269 mddev->new_chunk = mddev->chunk_size;
3273 static struct md_sysfs_entry md_reshape_position =
3274 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3275 reshape_position_store);
3278 static struct attribute *md_default_attrs[] = {
3281 &md_raid_disks.attr,
3282 &md_chunk_size.attr,
3284 &md_resync_start.attr,
3286 &md_new_device.attr,
3287 &md_safe_delay.attr,
3288 &md_array_state.attr,
3289 &md_reshape_position.attr,
3293 static struct attribute *md_redundancy_attrs[] = {
3295 &md_mismatches.attr,
3298 &md_sync_speed.attr,
3299 &md_sync_force_parallel.attr,
3300 &md_sync_completed.attr,
3303 &md_suspend_lo.attr,
3304 &md_suspend_hi.attr,
3309 static struct attribute_group md_redundancy_group = {
3311 .attrs = md_redundancy_attrs,
3316 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3318 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3319 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3324 rv = mddev_lock(mddev);
3326 rv = entry->show(mddev, page);
3327 mddev_unlock(mddev);
3333 md_attr_store(struct kobject *kobj, struct attribute *attr,
3334 const char *page, size_t length)
3336 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3337 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3342 if (!capable(CAP_SYS_ADMIN))
3344 rv = mddev_lock(mddev);
3346 rv = entry->store(mddev, page, length);
3347 mddev_unlock(mddev);
3352 static void md_free(struct kobject *ko)
3354 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3358 static struct sysfs_ops md_sysfs_ops = {
3359 .show = md_attr_show,
3360 .store = md_attr_store,
3362 static struct kobj_type md_ktype = {
3364 .sysfs_ops = &md_sysfs_ops,
3365 .default_attrs = md_default_attrs,
3370 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3372 static DEFINE_MUTEX(disks_mutex);
3373 mddev_t *mddev = mddev_find(dev);
3374 struct gendisk *disk;
3375 int partitioned = (MAJOR(dev) != MD_MAJOR);
3376 int shift = partitioned ? MdpMinorShift : 0;
3377 int unit = MINOR(dev) >> shift;
3383 mutex_lock(&disks_mutex);
3384 if (mddev->gendisk) {
3385 mutex_unlock(&disks_mutex);
3389 disk = alloc_disk(1 << shift);
3391 mutex_unlock(&disks_mutex);
3395 disk->major = MAJOR(dev);
3396 disk->first_minor = unit << shift;
3398 sprintf(disk->disk_name, "md_d%d", unit);
3400 sprintf(disk->disk_name, "md%d", unit);
3401 disk->fops = &md_fops;
3402 disk->private_data = mddev;
3403 disk->queue = mddev->queue;
3405 mddev->gendisk = disk;
3406 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3408 mutex_unlock(&disks_mutex);
3410 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3413 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3417 static void md_safemode_timeout(unsigned long data)
3419 mddev_t *mddev = (mddev_t *) data;
3421 if (!atomic_read(&mddev->writes_pending)) {
3422 mddev->safemode = 1;
3423 if (mddev->external)
3424 sysfs_notify(&mddev->kobj, NULL, "array_state");
3426 md_wakeup_thread(mddev->thread);
3429 static int start_dirty_degraded;
3431 static int do_md_run(mddev_t * mddev)
3435 struct list_head *tmp;
3437 struct gendisk *disk;
3438 struct mdk_personality *pers;
3439 char b[BDEVNAME_SIZE];
3441 if (list_empty(&mddev->disks))
3442 /* cannot run an array with no devices.. */
3449 * Analyze all RAID superblock(s)
3451 if (!mddev->raid_disks) {
3452 if (!mddev->persistent)
3457 chunk_size = mddev->chunk_size;
3460 if (chunk_size > MAX_CHUNK_SIZE) {
3461 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3462 chunk_size, MAX_CHUNK_SIZE);
3466 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3468 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3469 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3472 if (chunk_size < PAGE_SIZE) {
3473 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3474 chunk_size, PAGE_SIZE);
3478 /* devices must have minimum size of one chunk */
3479 rdev_for_each(rdev, tmp, mddev) {
3480 if (test_bit(Faulty, &rdev->flags))
3482 if (rdev->size < chunk_size / 1024) {
3484 "md: Dev %s smaller than chunk_size:"
3486 bdevname(rdev->bdev,b),
3487 (unsigned long long)rdev->size,
3495 if (mddev->level != LEVEL_NONE)
3496 request_module("md-level-%d", mddev->level);
3497 else if (mddev->clevel[0])
3498 request_module("md-%s", mddev->clevel);
3502 * Drop all container device buffers, from now on
3503 * the only valid external interface is through the md
3506 rdev_for_each(rdev, tmp, mddev) {
3507 if (test_bit(Faulty, &rdev->flags))
3509 sync_blockdev(rdev->bdev);
3510 invalidate_bdev(rdev->bdev);
3512 /* perform some consistency tests on the device.
3513 * We don't want the data to overlap the metadata,
3514 * Internal Bitmap issues has handled elsewhere.
3516 if (rdev->data_offset < rdev->sb_offset) {
3518 rdev->data_offset + mddev->size*2
3519 > rdev->sb_offset*2) {
3520 printk("md: %s: data overlaps metadata\n",
3525 if (rdev->sb_offset*2 + rdev->sb_size/512
3526 > rdev->data_offset) {
3527 printk("md: %s: metadata overlaps data\n",
3532 sysfs_notify(&rdev->kobj, NULL, "state");
3535 md_probe(mddev->unit, NULL, NULL);
3536 disk = mddev->gendisk;
3540 spin_lock(&pers_lock);
3541 pers = find_pers(mddev->level, mddev->clevel);
3542 if (!pers || !try_module_get(pers->owner)) {
3543 spin_unlock(&pers_lock);
3544 if (mddev->level != LEVEL_NONE)
3545 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3548 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3553 spin_unlock(&pers_lock);
3554 mddev->level = pers->level;
3555 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3557 if (mddev->reshape_position != MaxSector &&
3558 pers->start_reshape == NULL) {
3559 /* This personality cannot handle reshaping... */
3561 module_put(pers->owner);
3565 if (pers->sync_request) {
3566 /* Warn if this is a potentially silly
3569 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3571 struct list_head *tmp2;
3573 rdev_for_each(rdev, tmp, mddev) {
3574 rdev_for_each(rdev2, tmp2, mddev) {
3576 rdev->bdev->bd_contains ==
3577 rdev2->bdev->bd_contains) {
3579 "%s: WARNING: %s appears to be"
3580 " on the same physical disk as"
3583 bdevname(rdev->bdev,b),
3584 bdevname(rdev2->bdev,b2));
3591 "True protection against single-disk"
3592 " failure might be compromised.\n");
3595 mddev->recovery = 0;
3596 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3597 mddev->barriers_work = 1;
3598 mddev->ok_start_degraded = start_dirty_degraded;
3601 mddev->ro = 2; /* read-only, but switch on first write */
3603 err = mddev->pers->run(mddev);
3604 if (!err && mddev->pers->sync_request) {
3605 err = bitmap_create(mddev);
3607 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3608 mdname(mddev), err);
3609 mddev->pers->stop(mddev);
3613 printk(KERN_ERR "md: pers->run() failed ...\n");
3614 module_put(mddev->pers->owner);
3616 bitmap_destroy(mddev);
3619 if (mddev->pers->sync_request) {
3620 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3622 "md: cannot register extra attributes for %s\n",
3624 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3627 atomic_set(&mddev->writes_pending,0);
3628 mddev->safemode = 0;
3629 mddev->safemode_timer.function = md_safemode_timeout;
3630 mddev->safemode_timer.data = (unsigned long) mddev;
3631 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3634 rdev_for_each(rdev, tmp, mddev)
3635 if (rdev->raid_disk >= 0) {
3637 sprintf(nm, "rd%d", rdev->raid_disk);
3638 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3639 printk("md: cannot register %s for %s\n",
3643 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3646 md_update_sb(mddev, 0);
3648 set_capacity(disk, mddev->array_size<<1);
3650 /* If we call blk_queue_make_request here, it will
3651 * re-initialise max_sectors etc which may have been
3652 * refined inside -> run. So just set the bits we need to set.
3653 * Most initialisation happended when we called
3654 * blk_queue_make_request(..., md_fail_request)
3657 mddev->queue->queuedata = mddev;
3658 mddev->queue->make_request_fn = mddev->pers->make_request;
3660 /* If there is a partially-recovered drive we need to
3661 * start recovery here. If we leave it to md_check_recovery,
3662 * it will remove the drives and not do the right thing
3664 if (mddev->degraded && !mddev->sync_thread) {
3665 struct list_head *rtmp;
3667 rdev_for_each(rdev, rtmp, mddev)
3668 if (rdev->raid_disk >= 0 &&
3669 !test_bit(In_sync, &rdev->flags) &&
3670 !test_bit(Faulty, &rdev->flags))
3671 /* complete an interrupted recovery */
3673 if (spares && mddev->pers->sync_request) {
3674 mddev->recovery = 0;
3675 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3676 mddev->sync_thread = md_register_thread(md_do_sync,
3679 if (!mddev->sync_thread) {
3680 printk(KERN_ERR "%s: could not start resync"
3683 /* leave the spares where they are, it shouldn't hurt */
3684 mddev->recovery = 0;
3688 md_wakeup_thread(mddev->thread);
3689 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3692 md_new_event(mddev);
3693 sysfs_notify(&mddev->kobj, NULL, "array_state");
3694 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3695 sysfs_notify(&mddev->kobj, NULL, "degraded");
3696 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
3700 static int restart_array(mddev_t *mddev)
3702 struct gendisk *disk = mddev->gendisk;
3706 * Complain if it has no devices
3709 if (list_empty(&mddev->disks))
3717 mddev->safemode = 0;
3719 set_disk_ro(disk, 0);
3721 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3724 * Kick recovery or resync if necessary
3726 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3727 md_wakeup_thread(mddev->thread);
3728 md_wakeup_thread(mddev->sync_thread);
3730 sysfs_notify(&mddev->kobj, NULL, "array_state");
3739 /* similar to deny_write_access, but accounts for our holding a reference
3740 * to the file ourselves */
3741 static int deny_bitmap_write_access(struct file * file)
3743 struct inode *inode = file->f_mapping->host;
3745 spin_lock(&inode->i_lock);
3746 if (atomic_read(&inode->i_writecount) > 1) {
3747 spin_unlock(&inode->i_lock);
3750 atomic_set(&inode->i_writecount, -1);
3751 spin_unlock(&inode->i_lock);
3756 static void restore_bitmap_write_access(struct file *file)
3758 struct inode *inode = file->f_mapping->host;
3760 spin_lock(&inode->i_lock);
3761 atomic_set(&inode->i_writecount, 1);
3762 spin_unlock(&inode->i_lock);
3766 * 0 - completely stop and dis-assemble array
3767 * 1 - switch to readonly
3768 * 2 - stop but do not disassemble array
3770 static int do_md_stop(mddev_t * mddev, int mode)
3773 struct gendisk *disk = mddev->gendisk;
3776 if (atomic_read(&mddev->active)>2) {
3777 printk("md: %s still in use.\n",mdname(mddev));
3781 if (mddev->sync_thread) {
3782 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3783 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3784 md_unregister_thread(mddev->sync_thread);
3785 mddev->sync_thread = NULL;
3788 del_timer_sync(&mddev->safemode_timer);
3790 invalidate_partition(disk, 0);
3793 case 1: /* readonly */
3799 case 0: /* disassemble */
3801 bitmap_flush(mddev);
3802 md_super_wait(mddev);
3804 set_disk_ro(disk, 0);
3805 blk_queue_make_request(mddev->queue, md_fail_request);
3806 mddev->pers->stop(mddev);
3807 mddev->queue->merge_bvec_fn = NULL;
3808 mddev->queue->unplug_fn = NULL;
3809 mddev->queue->backing_dev_info.congested_fn = NULL;
3810 if (mddev->pers->sync_request)
3811 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3813 module_put(mddev->pers->owner);
3815 /* tell userspace to handle 'inactive' */
3816 sysfs_notify(&mddev->kobj, NULL, "array_state");
3818 set_capacity(disk, 0);
3824 if (!mddev->in_sync || mddev->flags) {
3825 /* mark array as shutdown cleanly */
3827 md_update_sb(mddev, 1);
3830 set_disk_ro(disk, 1);
3831 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3835 * Free resources if final stop
3839 struct list_head *tmp;
3841 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3843 bitmap_destroy(mddev);
3844 if (mddev->bitmap_file) {
3845 restore_bitmap_write_access(mddev->bitmap_file);
3846 fput(mddev->bitmap_file);
3847 mddev->bitmap_file = NULL;
3849 mddev->bitmap_offset = 0;
3851 rdev_for_each(rdev, tmp, mddev)
3852 if (rdev->raid_disk >= 0) {
3854 sprintf(nm, "rd%d", rdev->raid_disk);
3855 sysfs_remove_link(&mddev->kobj, nm);
3858 /* make sure all md_delayed_delete calls have finished */
3859 flush_scheduled_work();
3861 export_array(mddev);
3863 mddev->array_size = 0;
3865 mddev->raid_disks = 0;
3866 mddev->recovery_cp = 0;
3867 mddev->resync_min = 0;
3868 mddev->resync_max = MaxSector;
3869 mddev->reshape_position = MaxSector;
3870 mddev->external = 0;
3871 mddev->persistent = 0;
3872 mddev->level = LEVEL_NONE;
3873 mddev->clevel[0] = 0;
3876 mddev->metadata_type[0] = 0;
3877 mddev->chunk_size = 0;
3878 mddev->ctime = mddev->utime = 0;
3880 mddev->max_disks = 0;
3882 mddev->delta_disks = 0;
3883 mddev->new_level = LEVEL_NONE;
3884 mddev->new_layout = 0;
3885 mddev->new_chunk = 0;
3886 mddev->curr_resync = 0;
3887 mddev->resync_mismatches = 0;
3888 mddev->suspend_lo = mddev->suspend_hi = 0;
3889 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3890 mddev->recovery = 0;
3893 mddev->degraded = 0;
3894 mddev->barriers_work = 0;
3895 mddev->safemode = 0;
3897 } else if (mddev->pers)
3898 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3901 md_new_event(mddev);
3902 sysfs_notify(&mddev->kobj, NULL, "array_state");
3908 static void autorun_array(mddev_t *mddev)
3911 struct list_head *tmp;
3914 if (list_empty(&mddev->disks))
3917 printk(KERN_INFO "md: running: ");
3919 rdev_for_each(rdev, tmp, mddev) {
3920 char b[BDEVNAME_SIZE];
3921 printk("<%s>", bdevname(rdev->bdev,b));
3925 err = do_md_run (mddev);
3927 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3928 do_md_stop (mddev, 0);
3933 * lets try to run arrays based on all disks that have arrived
3934 * until now. (those are in pending_raid_disks)
3936 * the method: pick the first pending disk, collect all disks with
3937 * the same UUID, remove all from the pending list and put them into
3938 * the 'same_array' list. Then order this list based on superblock
3939 * update time (freshest comes first), kick out 'old' disks and
3940 * compare superblocks. If everything's fine then run it.
3942 * If "unit" is allocated, then bump its reference count
3944 static void autorun_devices(int part)
3946 struct list_head *tmp;
3947 mdk_rdev_t *rdev0, *rdev;
3949 char b[BDEVNAME_SIZE];
3951 printk(KERN_INFO "md: autorun ...\n");
3952 while (!list_empty(&pending_raid_disks)) {
3955 LIST_HEAD(candidates);
3956 rdev0 = list_entry(pending_raid_disks.next,
3957 mdk_rdev_t, same_set);
3959 printk(KERN_INFO "md: considering %s ...\n",
3960 bdevname(rdev0->bdev,b));
3961 INIT_LIST_HEAD(&candidates);
3962 rdev_for_each_list(rdev, tmp, pending_raid_disks)
3963 if (super_90_load(rdev, rdev0, 0) >= 0) {
3964 printk(KERN_INFO "md: adding %s ...\n",
3965 bdevname(rdev->bdev,b));
3966 list_move(&rdev->same_set, &candidates);
3969 * now we have a set of devices, with all of them having
3970 * mostly sane superblocks. It's time to allocate the
3974 dev = MKDEV(mdp_major,
3975 rdev0->preferred_minor << MdpMinorShift);
3976 unit = MINOR(dev) >> MdpMinorShift;
3978 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3981 if (rdev0->preferred_minor != unit) {
3982 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3983 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3987 md_probe(dev, NULL, NULL);
3988 mddev = mddev_find(dev);
3989 if (!mddev || !mddev->gendisk) {
3993 "md: cannot allocate memory for md drive.\n");
3996 if (mddev_lock(mddev))
3997 printk(KERN_WARNING "md: %s locked, cannot run\n",
3999 else if (mddev->raid_disks || mddev->major_version
4000 || !list_empty(&mddev->disks)) {
4002 "md: %s already running, cannot run %s\n",
4003 mdname(mddev), bdevname(rdev0->bdev,b));
4004 mddev_unlock(mddev);
4006 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4007 mddev->persistent = 1;
4008 rdev_for_each_list(rdev, tmp, candidates) {
4009 list_del_init(&rdev->same_set);
4010 if (bind_rdev_to_array(rdev, mddev))
4013 autorun_array(mddev);
4014 mddev_unlock(mddev);
4016 /* on success, candidates will be empty, on error
4019 rdev_for_each_list(rdev, tmp, candidates)
4023 printk(KERN_INFO "md: ... autorun DONE.\n");
4025 #endif /* !MODULE */
4027 static int get_version(void __user * arg)
4031 ver.major = MD_MAJOR_VERSION;
4032 ver.minor = MD_MINOR_VERSION;
4033 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4035 if (copy_to_user(arg, &ver, sizeof(ver)))
4041 static int get_array_info(mddev_t * mddev, void __user * arg)
4043 mdu_array_info_t info;
4044 int nr,working,active,failed,spare;
4046 struct list_head *tmp;
4048 nr=working=active=failed=spare=0;
4049 rdev_for_each(rdev, tmp, mddev) {
4051 if (test_bit(Faulty, &rdev->flags))
4055 if (test_bit(In_sync, &rdev->flags))
4062 info.major_version = mddev->major_version;
4063 info.minor_version = mddev->minor_version;
4064 info.patch_version = MD_PATCHLEVEL_VERSION;
4065 info.ctime = mddev->ctime;
4066 info.level = mddev->level;
4067 info.size = mddev->size;
4068 if (info.size != mddev->size) /* overflow */
4071 info.raid_disks = mddev->raid_disks;
4072 info.md_minor = mddev->md_minor;
4073 info.not_persistent= !mddev->persistent;
4075 info.utime = mddev->utime;
4078 info.state = (1<<MD_SB_CLEAN);
4079 if (mddev->bitmap && mddev->bitmap_offset)
4080 info.state = (1<<MD_SB_BITMAP_PRESENT);
4081 info.active_disks = active;
4082 info.working_disks = working;
4083 info.failed_disks = failed;
4084 info.spare_disks = spare;
4086 info.layout = mddev->layout;
4087 info.chunk_size = mddev->chunk_size;
4089 if (copy_to_user(arg, &info, sizeof(info)))
4095 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4097 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4098 char *ptr, *buf = NULL;
4101 md_allow_write(mddev);
4103 file = kmalloc(sizeof(*file), GFP_KERNEL);
4107 /* bitmap disabled, zero the first byte and copy out */
4108 if (!mddev->bitmap || !mddev->bitmap->file) {
4109 file->pathname[0] = '\0';
4113 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4117 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4121 strcpy(file->pathname, ptr);
4125 if (copy_to_user(arg, file, sizeof(*file)))
4133 static int get_disk_info(mddev_t * mddev, void __user * arg)
4135 mdu_disk_info_t info;
4139 if (copy_from_user(&info, arg, sizeof(info)))
4144 rdev = find_rdev_nr(mddev, nr);
4146 info.major = MAJOR(rdev->bdev->bd_dev);
4147 info.minor = MINOR(rdev->bdev->bd_dev);
4148 info.raid_disk = rdev->raid_disk;
4150 if (test_bit(Faulty, &rdev->flags))
4151 info.state |= (1<<MD_DISK_FAULTY);
4152 else if (test_bit(In_sync, &rdev->flags)) {
4153 info.state |= (1<<MD_DISK_ACTIVE);
4154 info.state |= (1<<MD_DISK_SYNC);
4156 if (test_bit(WriteMostly, &rdev->flags))
4157 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4159 info.major = info.minor = 0;
4160 info.raid_disk = -1;
4161 info.state = (1<<MD_DISK_REMOVED);
4164 if (copy_to_user(arg, &info, sizeof(info)))
4170 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4172 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4174 dev_t dev = MKDEV(info->major,info->minor);
4176 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4179 if (!mddev->raid_disks) {
4181 /* expecting a device which has a superblock */
4182 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4185 "md: md_import_device returned %ld\n",
4187 return PTR_ERR(rdev);
4189 if (!list_empty(&mddev->disks)) {
4190 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4191 mdk_rdev_t, same_set);
4192 int err = super_types[mddev->major_version]
4193 .load_super(rdev, rdev0, mddev->minor_version);
4196 "md: %s has different UUID to %s\n",
4197 bdevname(rdev->bdev,b),
4198 bdevname(rdev0->bdev,b2));
4203 err = bind_rdev_to_array(rdev, mddev);
4210 * add_new_disk can be used once the array is assembled
4211 * to add "hot spares". They must already have a superblock
4216 if (!mddev->pers->hot_add_disk) {
4218 "%s: personality does not support diskops!\n",
4222 if (mddev->persistent)
4223 rdev = md_import_device(dev, mddev->major_version,
4224 mddev->minor_version);
4226 rdev = md_import_device(dev, -1, -1);
4229 "md: md_import_device returned %ld\n",
4231 return PTR_ERR(rdev);
4233 /* set save_raid_disk if appropriate */
4234 if (!mddev->persistent) {
4235 if (info->state & (1<<MD_DISK_SYNC) &&
4236 info->raid_disk < mddev->raid_disks)
4237 rdev->raid_disk = info->raid_disk;
4239 rdev->raid_disk = -1;
4241 super_types[mddev->major_version].
4242 validate_super(mddev, rdev);
4243 rdev->saved_raid_disk = rdev->raid_disk;
4245 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4246 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4247 set_bit(WriteMostly, &rdev->flags);
4249 rdev->raid_disk = -1;
4250 err = bind_rdev_to_array(rdev, mddev);
4251 if (!err && !mddev->pers->hot_remove_disk) {
4252 /* If there is hot_add_disk but no hot_remove_disk
4253 * then added disks for geometry changes,
4254 * and should be added immediately.
4256 super_types[mddev->major_version].
4257 validate_super(mddev, rdev);
4258 err = mddev->pers->hot_add_disk(mddev, rdev);
4260 unbind_rdev_from_array(rdev);
4265 sysfs_notify(&rdev->kobj, NULL, "state");
4267 md_update_sb(mddev, 1);
4268 if (mddev->degraded)
4269 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4270 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4271 md_wakeup_thread(mddev->thread);
4275 /* otherwise, add_new_disk is only allowed
4276 * for major_version==0 superblocks
4278 if (mddev->major_version != 0) {
4279 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4284 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4286 rdev = md_import_device (dev, -1, 0);
4289 "md: error, md_import_device() returned %ld\n",
4291 return PTR_ERR(rdev);
4293 rdev->desc_nr = info->number;
4294 if (info->raid_disk < mddev->raid_disks)
4295 rdev->raid_disk = info->raid_disk;
4297 rdev->raid_disk = -1;
4299 if (rdev->raid_disk < mddev->raid_disks)
4300 if (info->state & (1<<MD_DISK_SYNC))
4301 set_bit(In_sync, &rdev->flags);
4303 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4304 set_bit(WriteMostly, &rdev->flags);
4306 if (!mddev->persistent) {
4307 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4308 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4310 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4311 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
4313 err = bind_rdev_to_array(rdev, mddev);
4323 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4325 char b[BDEVNAME_SIZE];
4328 rdev = find_rdev(mddev, dev);
4332 if (rdev->raid_disk >= 0)
4335 kick_rdev_from_array(rdev);
4336 md_update_sb(mddev, 1);
4337 md_new_event(mddev);
4341 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4342 bdevname(rdev->bdev,b), mdname(mddev));
4346 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4348 char b[BDEVNAME_SIZE];
4356 if (mddev->major_version != 0) {
4357 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4358 " version-0 superblocks.\n",
4362 if (!mddev->pers->hot_add_disk) {
4364 "%s: personality does not support diskops!\n",
4369 rdev = md_import_device (dev, -1, 0);
4372 "md: error, md_import_device() returned %ld\n",
4377 if (mddev->persistent)
4378 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4381 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4383 size = calc_dev_size(rdev, mddev->chunk_size);
4386 if (test_bit(Faulty, &rdev->flags)) {
4388 "md: can not hot-add faulty %s disk to %s!\n",
4389 bdevname(rdev->bdev,b), mdname(mddev));
4393 clear_bit(In_sync, &rdev->flags);
4395 rdev->saved_raid_disk = -1;
4396 err = bind_rdev_to_array(rdev, mddev);
4401 * The rest should better be atomic, we can have disk failures
4402 * noticed in interrupt contexts ...
4405 if (rdev->desc_nr == mddev->max_disks) {
4406 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4409 goto abort_unbind_export;
4412 rdev->raid_disk = -1;
4414 md_update_sb(mddev, 1);
4417 * Kick recovery, maybe this spare has to be added to the
4418 * array immediately.
4420 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4421 md_wakeup_thread(mddev->thread);
4422 md_new_event(mddev);
4425 abort_unbind_export:
4426 unbind_rdev_from_array(rdev);
4433 static int set_bitmap_file(mddev_t *mddev, int fd)
4438 if (!mddev->pers->quiesce)
4440 if (mddev->recovery || mddev->sync_thread)
4442 /* we should be able to change the bitmap.. */
4448 return -EEXIST; /* cannot add when bitmap is present */
4449 mddev->bitmap_file = fget(fd);
4451 if (mddev->bitmap_file == NULL) {
4452 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4457 err = deny_bitmap_write_access(mddev->bitmap_file);
4459 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4461 fput(mddev->bitmap_file);
4462 mddev->bitmap_file = NULL;
4465 mddev->bitmap_offset = 0; /* file overrides offset */
4466 } else if (mddev->bitmap == NULL)
4467 return -ENOENT; /* cannot remove what isn't there */
4470 mddev->pers->quiesce(mddev, 1);
4472 err = bitmap_create(mddev);
4473 if (fd < 0 || err) {
4474 bitmap_destroy(mddev);
4475 fd = -1; /* make sure to put the file */
4477 mddev->pers->quiesce(mddev, 0);
4480 if (mddev->bitmap_file) {
4481 restore_bitmap_write_access(mddev->bitmap_file);
4482 fput(mddev->bitmap_file);
4484 mddev->bitmap_file = NULL;
4491 * set_array_info is used two different ways
4492 * The original usage is when creating a new array.
4493 * In this usage, raid_disks is > 0 and it together with
4494 * level, size, not_persistent,layout,chunksize determine the
4495 * shape of the array.
4496 * This will always create an array with a type-0.90.0 superblock.
4497 * The newer usage is when assembling an array.
4498 * In this case raid_disks will be 0, and the major_version field is
4499 * use to determine which style super-blocks are to be found on the devices.
4500 * The minor and patch _version numbers are also kept incase the
4501 * super_block handler wishes to interpret them.
4503 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4506 if (info->raid_disks == 0) {
4507 /* just setting version number for superblock loading */
4508 if (info->major_version < 0 ||
4509 info->major_version >= ARRAY_SIZE(super_types) ||
4510 super_types[info->major_version].name == NULL) {
4511 /* maybe try to auto-load a module? */
4513 "md: superblock version %d not known\n",
4514 info->major_version);
4517 mddev->major_version = info->major_version;
4518 mddev->minor_version = info->minor_version;
4519 mddev->patch_version = info->patch_version;
4520 mddev->persistent = !info->not_persistent;
4523 mddev->major_version = MD_MAJOR_VERSION;
4524 mddev->minor_version = MD_MINOR_VERSION;
4525 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4526 mddev->ctime = get_seconds();
4528 mddev->level = info->level;
4529 mddev->clevel[0] = 0;
4530 mddev->size = info->size;
4531 mddev->raid_disks = info->raid_disks;
4532 /* don't set md_minor, it is determined by which /dev/md* was
4535 if (info->state & (1<<MD_SB_CLEAN))
4536 mddev->recovery_cp = MaxSector;
4538 mddev->recovery_cp = 0;
4539 mddev->persistent = ! info->not_persistent;
4540 mddev->external = 0;
4542 mddev->layout = info->layout;
4543 mddev->chunk_size = info->chunk_size;
4545 mddev->max_disks = MD_SB_DISKS;
4547 if (mddev->persistent)
4549 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4551 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4552 mddev->bitmap_offset = 0;
4554 mddev->reshape_position = MaxSector;
4557 * Generate a 128 bit UUID
4559 get_random_bytes(mddev->uuid, 16);
4561 mddev->new_level = mddev->level;
4562 mddev->new_chunk = mddev->chunk_size;
4563 mddev->new_layout = mddev->layout;
4564 mddev->delta_disks = 0;
4569 static int update_size(mddev_t *mddev, unsigned long size)
4573 struct list_head *tmp;
4574 int fit = (size == 0);
4576 if (mddev->pers->resize == NULL)
4578 /* The "size" is the amount of each device that is used.
4579 * This can only make sense for arrays with redundancy.
4580 * linear and raid0 always use whatever space is available
4581 * We can only consider changing the size if no resync
4582 * or reconstruction is happening, and if the new size
4583 * is acceptable. It must fit before the sb_offset or,
4584 * if that is <data_offset, it must fit before the
4585 * size of each device.
4586 * If size is zero, we find the largest size that fits.
4588 if (mddev->sync_thread)
4590 rdev_for_each(rdev, tmp, mddev) {
4592 avail = rdev->size * 2;
4594 if (fit && (size == 0 || size > avail/2))
4596 if (avail < ((sector_t)size << 1))
4599 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4601 struct block_device *bdev;
4603 bdev = bdget_disk(mddev->gendisk, 0);
4605 mutex_lock(&bdev->bd_inode->i_mutex);
4606 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4607 mutex_unlock(&bdev->bd_inode->i_mutex);
4614 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4617 /* change the number of raid disks */
4618 if (mddev->pers->check_reshape == NULL)
4620 if (raid_disks <= 0 ||
4621 raid_disks >= mddev->max_disks)
4623 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4625 mddev->delta_disks = raid_disks - mddev->raid_disks;
4627 rv = mddev->pers->check_reshape(mddev);
4633 * update_array_info is used to change the configuration of an
4635 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4636 * fields in the info are checked against the array.
4637 * Any differences that cannot be handled will cause an error.
4638 * Normally, only one change can be managed at a time.
4640 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4646 /* calculate expected state,ignoring low bits */
4647 if (mddev->bitmap && mddev->bitmap_offset)
4648 state |= (1 << MD_SB_BITMAP_PRESENT);
4650 if (mddev->major_version != info->major_version ||
4651 mddev->minor_version != info->minor_version ||
4652 /* mddev->patch_version != info->patch_version || */
4653 mddev->ctime != info->ctime ||
4654 mddev->level != info->level ||
4655 /* mddev->layout != info->layout || */
4656 !mddev->persistent != info->not_persistent||
4657 mddev->chunk_size != info->chunk_size ||
4658 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4659 ((state^info->state) & 0xfffffe00)
4662 /* Check there is only one change */
4663 if (info->size >= 0 && mddev->size != info->size) cnt++;
4664 if (mddev->raid_disks != info->raid_disks) cnt++;
4665 if (mddev->layout != info->layout) cnt++;
4666 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4667 if (cnt == 0) return 0;
4668 if (cnt > 1) return -EINVAL;
4670 if (mddev->layout != info->layout) {
4672 * we don't need to do anything at the md level, the
4673 * personality will take care of it all.
4675 if (mddev->pers->reconfig == NULL)
4678 return mddev->pers->reconfig(mddev, info->layout, -1);
4680 if (info->size >= 0 && mddev->size != info->size)
4681 rv = update_size(mddev, info->size);
4683 if (mddev->raid_disks != info->raid_disks)
4684 rv = update_raid_disks(mddev, info->raid_disks);
4686 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4687 if (mddev->pers->quiesce == NULL)
4689 if (mddev->recovery || mddev->sync_thread)
4691 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4692 /* add the bitmap */
4695 if (mddev->default_bitmap_offset == 0)
4697 mddev->bitmap_offset = mddev->default_bitmap_offset;
4698 mddev->pers->quiesce(mddev, 1);
4699 rv = bitmap_create(mddev);
4701 bitmap_destroy(mddev);
4702 mddev->pers->quiesce(mddev, 0);
4704 /* remove the bitmap */
4707 if (mddev->bitmap->file)
4709 mddev->pers->quiesce(mddev, 1);
4710 bitmap_destroy(mddev);
4711 mddev->pers->quiesce(mddev, 0);
4712 mddev->bitmap_offset = 0;
4715 md_update_sb(mddev, 1);
4719 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4723 if (mddev->pers == NULL)
4726 rdev = find_rdev(mddev, dev);
4730 md_error(mddev, rdev);
4734 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4736 mddev_t *mddev = bdev->bd_disk->private_data;
4740 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4744 static int md_ioctl(struct inode *inode, struct file *file,
4745 unsigned int cmd, unsigned long arg)
4748 void __user *argp = (void __user *)arg;
4749 mddev_t *mddev = NULL;
4751 if (!capable(CAP_SYS_ADMIN))
4755 * Commands dealing with the RAID driver but not any
4761 err = get_version(argp);
4764 case PRINT_RAID_DEBUG:
4772 autostart_arrays(arg);
4779 * Commands creating/starting a new array:
4782 mddev = inode->i_bdev->bd_disk->private_data;
4789 err = mddev_lock(mddev);
4792 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4799 case SET_ARRAY_INFO:
4801 mdu_array_info_t info;
4803 memset(&info, 0, sizeof(info));
4804 else if (copy_from_user(&info, argp, sizeof(info))) {
4809 err = update_array_info(mddev, &info);
4811 printk(KERN_WARNING "md: couldn't update"
4812 " array info. %d\n", err);
4817 if (!list_empty(&mddev->disks)) {
4819 "md: array %s already has disks!\n",
4824 if (mddev->raid_disks) {
4826 "md: array %s already initialised!\n",
4831 err = set_array_info(mddev, &info);
4833 printk(KERN_WARNING "md: couldn't set"
4834 " array info. %d\n", err);
4844 * Commands querying/configuring an existing array:
4846 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4847 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4848 if ((!mddev->raid_disks && !mddev->external)
4849 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4850 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4851 && cmd != GET_BITMAP_FILE) {
4857 * Commands even a read-only array can execute:
4861 case GET_ARRAY_INFO:
4862 err = get_array_info(mddev, argp);
4865 case GET_BITMAP_FILE:
4866 err = get_bitmap_file(mddev, argp);
4870 err = get_disk_info(mddev, argp);
4873 case RESTART_ARRAY_RW:
4874 err = restart_array(mddev);
4878 err = do_md_stop (mddev, 0);
4882 err = do_md_stop (mddev, 1);
4886 * We have a problem here : there is no easy way to give a CHS
4887 * virtual geometry. We currently pretend that we have a 2 heads
4888 * 4 sectors (with a BIG number of cylinders...). This drives
4889 * dosfs just mad... ;-)
4894 * The remaining ioctls are changing the state of the
4895 * superblock, so we do not allow them on read-only arrays.
4896 * However non-MD ioctls (e.g. get-size) will still come through
4897 * here and hit the 'default' below, so only disallow
4898 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4900 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4901 mddev->ro && mddev->pers) {
4902 if (mddev->ro == 2) {
4904 sysfs_notify(&mddev->kobj, NULL, "array_state");
4905 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4906 md_wakeup_thread(mddev->thread);
4918 mdu_disk_info_t info;
4919 if (copy_from_user(&info, argp, sizeof(info)))
4922 err = add_new_disk(mddev, &info);
4926 case HOT_REMOVE_DISK:
4927 err = hot_remove_disk(mddev, new_decode_dev(arg));
4931 err = hot_add_disk(mddev, new_decode_dev(arg));
4934 case SET_DISK_FAULTY:
4935 err = set_disk_faulty(mddev, new_decode_dev(arg));
4939 err = do_md_run (mddev);
4942 case SET_BITMAP_FILE:
4943 err = set_bitmap_file(mddev, (int)arg);
4953 mddev_unlock(mddev);
4963 static int md_open(struct inode *inode, struct file *file)
4966 * Succeed if we can lock the mddev, which confirms that
4967 * it isn't being stopped right now.
4969 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4972 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
4977 mddev_unlock(mddev);
4979 check_disk_change(inode->i_bdev);
4984 static int md_release(struct inode *inode, struct file * file)
4986 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4994 static int md_media_changed(struct gendisk *disk)
4996 mddev_t *mddev = disk->private_data;
4998 return mddev->changed;
5001 static int md_revalidate(struct gendisk *disk)
5003 mddev_t *mddev = disk->private_data;
5008 static struct block_device_operations md_fops =
5010 .owner = THIS_MODULE,
5012 .release = md_release,
5014 .getgeo = md_getgeo,
5015 .media_changed = md_media_changed,
5016 .revalidate_disk= md_revalidate,
5019 static int md_thread(void * arg)
5021 mdk_thread_t *thread = arg;
5024 * md_thread is a 'system-thread', it's priority should be very
5025 * high. We avoid resource deadlocks individually in each
5026 * raid personality. (RAID5 does preallocation) We also use RR and
5027 * the very same RT priority as kswapd, thus we will never get
5028 * into a priority inversion deadlock.
5030 * we definitely have to have equal or higher priority than
5031 * bdflush, otherwise bdflush will deadlock if there are too
5032 * many dirty RAID5 blocks.
5035 allow_signal(SIGKILL);
5036 while (!kthread_should_stop()) {
5038 /* We need to wait INTERRUPTIBLE so that
5039 * we don't add to the load-average.
5040 * That means we need to be sure no signals are
5043 if (signal_pending(current))
5044 flush_signals(current);
5046 wait_event_interruptible_timeout
5048 test_bit(THREAD_WAKEUP, &thread->flags)
5049 || kthread_should_stop(),
5052 clear_bit(THREAD_WAKEUP, &thread->flags);
5054 thread->run(thread->mddev);
5060 void md_wakeup_thread(mdk_thread_t *thread)
5063 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5064 set_bit(THREAD_WAKEUP, &thread->flags);
5065 wake_up(&thread->wqueue);
5069 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5072 mdk_thread_t *thread;
5074 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5078 init_waitqueue_head(&thread->wqueue);
5081 thread->mddev = mddev;
5082 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5083 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5084 if (IS_ERR(thread->tsk)) {
5091 void md_unregister_thread(mdk_thread_t *thread)
5093 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5095 kthread_stop(thread->tsk);
5099 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5106 if (!rdev || test_bit(Faulty, &rdev->flags))
5109 if (mddev->external)
5110 set_bit(Blocked, &rdev->flags);
5112 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5114 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5115 __builtin_return_address(0),__builtin_return_address(1),
5116 __builtin_return_address(2),__builtin_return_address(3));
5120 if (!mddev->pers->error_handler)
5122 mddev->pers->error_handler(mddev,rdev);
5123 if (mddev->degraded)
5124 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5125 set_bit(StateChanged, &rdev->flags);
5126 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5127 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5128 md_wakeup_thread(mddev->thread);
5129 md_new_event_inintr(mddev);
5132 /* seq_file implementation /proc/mdstat */
5134 static void status_unused(struct seq_file *seq)
5138 struct list_head *tmp;
5140 seq_printf(seq, "unused devices: ");
5142 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
5143 char b[BDEVNAME_SIZE];
5145 seq_printf(seq, "%s ",
5146 bdevname(rdev->bdev,b));
5149 seq_printf(seq, "<none>");
5151 seq_printf(seq, "\n");
5155 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5157 sector_t max_blocks, resync, res;
5158 unsigned long dt, db, rt;
5160 unsigned int per_milli;
5162 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5164 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5165 max_blocks = mddev->resync_max_sectors >> 1;
5167 max_blocks = mddev->size;
5170 * Should not happen.
5176 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5177 * in a sector_t, and (max_blocks>>scale) will fit in a
5178 * u32, as those are the requirements for sector_div.
5179 * Thus 'scale' must be at least 10
5182 if (sizeof(sector_t) > sizeof(unsigned long)) {
5183 while ( max_blocks/2 > (1ULL<<(scale+32)))
5186 res = (resync>>scale)*1000;
5187 sector_div(res, (u32)((max_blocks>>scale)+1));
5191 int i, x = per_milli/50, y = 20-x;
5192 seq_printf(seq, "[");
5193 for (i = 0; i < x; i++)
5194 seq_printf(seq, "=");
5195 seq_printf(seq, ">");
5196 for (i = 0; i < y; i++)
5197 seq_printf(seq, ".");
5198 seq_printf(seq, "] ");
5200 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5201 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5203 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5205 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5206 "resync" : "recovery"))),
5207 per_milli/10, per_milli % 10,
5208 (unsigned long long) resync,
5209 (unsigned long long) max_blocks);
5212 * We do not want to overflow, so the order of operands and
5213 * the * 100 / 100 trick are important. We do a +1 to be
5214 * safe against division by zero. We only estimate anyway.
5216 * dt: time from mark until now
5217 * db: blocks written from mark until now
5218 * rt: remaining time
5220 dt = ((jiffies - mddev->resync_mark) / HZ);
5222 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5223 - mddev->resync_mark_cnt;
5224 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5226 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5228 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5231 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5233 struct list_head *tmp;
5243 spin_lock(&all_mddevs_lock);
5244 list_for_each(tmp,&all_mddevs)
5246 mddev = list_entry(tmp, mddev_t, all_mddevs);
5248 spin_unlock(&all_mddevs_lock);
5251 spin_unlock(&all_mddevs_lock);
5253 return (void*)2;/* tail */
5257 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5259 struct list_head *tmp;
5260 mddev_t *next_mddev, *mddev = v;
5266 spin_lock(&all_mddevs_lock);
5268 tmp = all_mddevs.next;
5270 tmp = mddev->all_mddevs.next;
5271 if (tmp != &all_mddevs)
5272 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5274 next_mddev = (void*)2;
5277 spin_unlock(&all_mddevs_lock);
5285 static void md_seq_stop(struct seq_file *seq, void *v)
5289 if (mddev && v != (void*)1 && v != (void*)2)
5293 struct mdstat_info {
5297 static int md_seq_show(struct seq_file *seq, void *v)
5301 struct list_head *tmp2;
5303 struct mdstat_info *mi = seq->private;
5304 struct bitmap *bitmap;
5306 if (v == (void*)1) {
5307 struct mdk_personality *pers;
5308 seq_printf(seq, "Personalities : ");
5309 spin_lock(&pers_lock);
5310 list_for_each_entry(pers, &pers_list, list)
5311 seq_printf(seq, "[%s] ", pers->name);
5313 spin_unlock(&pers_lock);
5314 seq_printf(seq, "\n");
5315 mi->event = atomic_read(&md_event_count);
5318 if (v == (void*)2) {
5323 if (mddev_lock(mddev) < 0)
5326 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5327 seq_printf(seq, "%s : %sactive", mdname(mddev),
5328 mddev->pers ? "" : "in");
5331 seq_printf(seq, " (read-only)");
5333 seq_printf(seq, " (auto-read-only)");
5334 seq_printf(seq, " %s", mddev->pers->name);
5338 rdev_for_each(rdev, tmp2, mddev) {
5339 char b[BDEVNAME_SIZE];
5340 seq_printf(seq, " %s[%d]",
5341 bdevname(rdev->bdev,b), rdev->desc_nr);
5342 if (test_bit(WriteMostly, &rdev->flags))
5343 seq_printf(seq, "(W)");
5344 if (test_bit(Faulty, &rdev->flags)) {
5345 seq_printf(seq, "(F)");
5347 } else if (rdev->raid_disk < 0)
5348 seq_printf(seq, "(S)"); /* spare */
5352 if (!list_empty(&mddev->disks)) {
5354 seq_printf(seq, "\n %llu blocks",
5355 (unsigned long long)mddev->array_size);
5357 seq_printf(seq, "\n %llu blocks",
5358 (unsigned long long)size);
5360 if (mddev->persistent) {
5361 if (mddev->major_version != 0 ||
5362 mddev->minor_version != 90) {
5363 seq_printf(seq," super %d.%d",
5364 mddev->major_version,
5365 mddev->minor_version);
5367 } else if (mddev->external)
5368 seq_printf(seq, " super external:%s",
5369 mddev->metadata_type);
5371 seq_printf(seq, " super non-persistent");
5374 mddev->pers->status (seq, mddev);
5375 seq_printf(seq, "\n ");
5376 if (mddev->pers->sync_request) {
5377 if (mddev->curr_resync > 2) {
5378 status_resync (seq, mddev);
5379 seq_printf(seq, "\n ");
5380 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5381 seq_printf(seq, "\tresync=DELAYED\n ");
5382 else if (mddev->recovery_cp < MaxSector)
5383 seq_printf(seq, "\tresync=PENDING\n ");
5386 seq_printf(seq, "\n ");
5388 if ((bitmap = mddev->bitmap)) {
5389 unsigned long chunk_kb;
5390 unsigned long flags;
5391 spin_lock_irqsave(&bitmap->lock, flags);
5392 chunk_kb = bitmap->chunksize >> 10;
5393 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5395 bitmap->pages - bitmap->missing_pages,
5397 (bitmap->pages - bitmap->missing_pages)
5398 << (PAGE_SHIFT - 10),
5399 chunk_kb ? chunk_kb : bitmap->chunksize,
5400 chunk_kb ? "KB" : "B");
5402 seq_printf(seq, ", file: ");
5403 seq_path(seq, &bitmap->file->f_path, " \t\n");
5406 seq_printf(seq, "\n");
5407 spin_unlock_irqrestore(&bitmap->lock, flags);
5410 seq_printf(seq, "\n");
5412 mddev_unlock(mddev);
5417 static struct seq_operations md_seq_ops = {
5418 .start = md_seq_start,
5419 .next = md_seq_next,
5420 .stop = md_seq_stop,
5421 .show = md_seq_show,
5424 static int md_seq_open(struct inode *inode, struct file *file)
5427 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5431 error = seq_open(file, &md_seq_ops);
5435 struct seq_file *p = file->private_data;
5437 mi->event = atomic_read(&md_event_count);
5442 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5444 struct seq_file *m = filp->private_data;
5445 struct mdstat_info *mi = m->private;
5448 poll_wait(filp, &md_event_waiters, wait);
5450 /* always allow read */
5451 mask = POLLIN | POLLRDNORM;
5453 if (mi->event != atomic_read(&md_event_count))
5454 mask |= POLLERR | POLLPRI;
5458 static const struct file_operations md_seq_fops = {
5459 .owner = THIS_MODULE,
5460 .open = md_seq_open,
5462 .llseek = seq_lseek,
5463 .release = seq_release_private,
5464 .poll = mdstat_poll,
5467 int register_md_personality(struct mdk_personality *p)
5469 spin_lock(&pers_lock);
5470 list_add_tail(&p->list, &pers_list);
5471 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5472 spin_unlock(&pers_lock);
5476 int unregister_md_personality(struct mdk_personality *p)
5478 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5479 spin_lock(&pers_lock);
5480 list_del_init(&p->list);
5481 spin_unlock(&pers_lock);
5485 static int is_mddev_idle(mddev_t *mddev)
5488 struct list_head *tmp;
5493 rdev_for_each(rdev, tmp, mddev) {
5494 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5495 curr_events = disk_stat_read(disk, sectors[0]) +
5496 disk_stat_read(disk, sectors[1]) -
5497 atomic_read(&disk->sync_io);
5498 /* sync IO will cause sync_io to increase before the disk_stats
5499 * as sync_io is counted when a request starts, and
5500 * disk_stats is counted when it completes.
5501 * So resync activity will cause curr_events to be smaller than
5502 * when there was no such activity.
5503 * non-sync IO will cause disk_stat to increase without
5504 * increasing sync_io so curr_events will (eventually)
5505 * be larger than it was before. Once it becomes
5506 * substantially larger, the test below will cause
5507 * the array to appear non-idle, and resync will slow
5509 * If there is a lot of outstanding resync activity when
5510 * we set last_event to curr_events, then all that activity
5511 * completing might cause the array to appear non-idle
5512 * and resync will be slowed down even though there might
5513 * not have been non-resync activity. This will only
5514 * happen once though. 'last_events' will soon reflect
5515 * the state where there is little or no outstanding
5516 * resync requests, and further resync activity will
5517 * always make curr_events less than last_events.
5520 if (curr_events - rdev->last_events > 4096) {
5521 rdev->last_events = curr_events;
5528 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5530 /* another "blocks" (512byte) blocks have been synced */
5531 atomic_sub(blocks, &mddev->recovery_active);
5532 wake_up(&mddev->recovery_wait);
5534 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5535 md_wakeup_thread(mddev->thread);
5536 // stop recovery, signal do_sync ....
5541 /* md_write_start(mddev, bi)
5542 * If we need to update some array metadata (e.g. 'active' flag
5543 * in superblock) before writing, schedule a superblock update
5544 * and wait for it to complete.
5546 void md_write_start(mddev_t *mddev, struct bio *bi)
5549 if (bio_data_dir(bi) != WRITE)
5552 BUG_ON(mddev->ro == 1);
5553 if (mddev->ro == 2) {
5554 /* need to switch to read/write */
5556 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5557 md_wakeup_thread(mddev->thread);
5558 md_wakeup_thread(mddev->sync_thread);
5561 atomic_inc(&mddev->writes_pending);
5562 if (mddev->safemode == 1)
5563 mddev->safemode = 0;
5564 if (mddev->in_sync) {
5565 spin_lock_irq(&mddev->write_lock);
5566 if (mddev->in_sync) {
5568 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5569 md_wakeup_thread(mddev->thread);
5572 spin_unlock_irq(&mddev->write_lock);
5575 sysfs_notify(&mddev->kobj, NULL, "array_state");
5576 wait_event(mddev->sb_wait,
5577 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5578 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5581 void md_write_end(mddev_t *mddev)
5583 if (atomic_dec_and_test(&mddev->writes_pending)) {
5584 if (mddev->safemode == 2)
5585 md_wakeup_thread(mddev->thread);
5586 else if (mddev->safemode_delay)
5587 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5591 /* md_allow_write(mddev)
5592 * Calling this ensures that the array is marked 'active' so that writes
5593 * may proceed without blocking. It is important to call this before
5594 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5595 * Must be called with mddev_lock held.
5597 void md_allow_write(mddev_t *mddev)
5603 if (!mddev->pers->sync_request)
5606 spin_lock_irq(&mddev->write_lock);
5607 if (mddev->in_sync) {
5609 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5610 if (mddev->safemode_delay &&
5611 mddev->safemode == 0)
5612 mddev->safemode = 1;
5613 spin_unlock_irq(&mddev->write_lock);
5614 md_update_sb(mddev, 0);
5616 sysfs_notify(&mddev->kobj, NULL, "array_state");
5617 /* wait for the dirty state to be recorded in the metadata */
5618 wait_event(mddev->sb_wait,
5619 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5620 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5622 spin_unlock_irq(&mddev->write_lock);
5624 EXPORT_SYMBOL_GPL(md_allow_write);
5626 #define SYNC_MARKS 10
5627 #define SYNC_MARK_STEP (3*HZ)
5628 void md_do_sync(mddev_t *mddev)
5631 unsigned int currspeed = 0,
5633 sector_t max_sectors,j, io_sectors;
5634 unsigned long mark[SYNC_MARKS];
5635 sector_t mark_cnt[SYNC_MARKS];
5637 struct list_head *tmp;
5638 sector_t last_check;
5640 struct list_head *rtmp;
5644 /* just incase thread restarts... */
5645 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5647 if (mddev->ro) /* never try to sync a read-only array */
5650 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5651 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5652 desc = "data-check";
5653 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5654 desc = "requested-resync";
5657 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5662 /* we overload curr_resync somewhat here.
5663 * 0 == not engaged in resync at all
5664 * 2 == checking that there is no conflict with another sync
5665 * 1 == like 2, but have yielded to allow conflicting resync to
5667 * other == active in resync - this many blocks
5669 * Before starting a resync we must have set curr_resync to
5670 * 2, and then checked that every "conflicting" array has curr_resync
5671 * less than ours. When we find one that is the same or higher
5672 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5673 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5674 * This will mean we have to start checking from the beginning again.
5679 mddev->curr_resync = 2;
5682 if (kthread_should_stop()) {
5683 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5686 for_each_mddev(mddev2, tmp) {
5687 if (mddev2 == mddev)
5689 if (!mddev->parallel_resync
5690 && mddev2->curr_resync
5691 && match_mddev_units(mddev, mddev2)) {
5693 if (mddev < mddev2 && mddev->curr_resync == 2) {
5694 /* arbitrarily yield */
5695 mddev->curr_resync = 1;
5696 wake_up(&resync_wait);
5698 if (mddev > mddev2 && mddev->curr_resync == 1)
5699 /* no need to wait here, we can wait the next
5700 * time 'round when curr_resync == 2
5703 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5704 if (!kthread_should_stop() &&
5705 mddev2->curr_resync >= mddev->curr_resync) {
5706 printk(KERN_INFO "md: delaying %s of %s"
5707 " until %s has finished (they"
5708 " share one or more physical units)\n",
5709 desc, mdname(mddev), mdname(mddev2));
5712 finish_wait(&resync_wait, &wq);
5715 finish_wait(&resync_wait, &wq);
5718 } while (mddev->curr_resync < 2);
5721 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5722 /* resync follows the size requested by the personality,
5723 * which defaults to physical size, but can be virtual size
5725 max_sectors = mddev->resync_max_sectors;
5726 mddev->resync_mismatches = 0;
5727 /* we don't use the checkpoint if there's a bitmap */
5728 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5729 j = mddev->resync_min;
5730 else if (!mddev->bitmap)
5731 j = mddev->recovery_cp;
5733 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5734 max_sectors = mddev->size << 1;
5736 /* recovery follows the physical size of devices */
5737 max_sectors = mddev->size << 1;
5739 rdev_for_each(rdev, rtmp, mddev)
5740 if (rdev->raid_disk >= 0 &&
5741 !test_bit(Faulty, &rdev->flags) &&
5742 !test_bit(In_sync, &rdev->flags) &&
5743 rdev->recovery_offset < j)
5744 j = rdev->recovery_offset;
5747 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5748 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5749 " %d KB/sec/disk.\n", speed_min(mddev));
5750 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5751 "(but not more than %d KB/sec) for %s.\n",
5752 speed_max(mddev), desc);
5754 is_mddev_idle(mddev); /* this also initializes IO event counters */
5757 for (m = 0; m < SYNC_MARKS; m++) {
5759 mark_cnt[m] = io_sectors;
5762 mddev->resync_mark = mark[last_mark];
5763 mddev->resync_mark_cnt = mark_cnt[last_mark];
5766 * Tune reconstruction:
5768 window = 32*(PAGE_SIZE/512);
5769 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5770 window/2,(unsigned long long) max_sectors/2);
5772 atomic_set(&mddev->recovery_active, 0);
5777 "md: resuming %s of %s from checkpoint.\n",
5778 desc, mdname(mddev));
5779 mddev->curr_resync = j;
5782 while (j < max_sectors) {
5786 if (j >= mddev->resync_max) {
5787 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5788 wait_event(mddev->recovery_wait,
5789 mddev->resync_max > j
5790 || kthread_should_stop());
5792 if (kthread_should_stop())
5794 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5795 currspeed < speed_min(mddev));
5797 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5801 if (!skipped) { /* actual IO requested */
5802 io_sectors += sectors;
5803 atomic_add(sectors, &mddev->recovery_active);
5807 if (j>1) mddev->curr_resync = j;
5808 mddev->curr_mark_cnt = io_sectors;
5809 if (last_check == 0)
5810 /* this is the earliers that rebuilt will be
5811 * visible in /proc/mdstat
5813 md_new_event(mddev);
5815 if (last_check + window > io_sectors || j == max_sectors)
5818 last_check = io_sectors;
5820 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5824 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5826 int next = (last_mark+1) % SYNC_MARKS;
5828 mddev->resync_mark = mark[next];
5829 mddev->resync_mark_cnt = mark_cnt[next];
5830 mark[next] = jiffies;
5831 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5836 if (kthread_should_stop())
5841 * this loop exits only if either when we are slower than
5842 * the 'hard' speed limit, or the system was IO-idle for
5844 * the system might be non-idle CPU-wise, but we only care
5845 * about not overloading the IO subsystem. (things like an
5846 * e2fsck being done on the RAID array should execute fast)
5848 blk_unplug(mddev->queue);
5851 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5852 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5854 if (currspeed > speed_min(mddev)) {
5855 if ((currspeed > speed_max(mddev)) ||
5856 !is_mddev_idle(mddev)) {
5862 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5864 * this also signals 'finished resyncing' to md_stop
5867 blk_unplug(mddev->queue);
5869 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5871 /* tell personality that we are finished */
5872 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5874 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5875 mddev->curr_resync > 2) {
5876 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5877 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5878 if (mddev->curr_resync >= mddev->recovery_cp) {
5880 "md: checkpointing %s of %s.\n",
5881 desc, mdname(mddev));
5882 mddev->recovery_cp = mddev->curr_resync;
5885 mddev->recovery_cp = MaxSector;
5887 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5888 mddev->curr_resync = MaxSector;
5889 rdev_for_each(rdev, rtmp, mddev)
5890 if (rdev->raid_disk >= 0 &&
5891 !test_bit(Faulty, &rdev->flags) &&
5892 !test_bit(In_sync, &rdev->flags) &&
5893 rdev->recovery_offset < mddev->curr_resync)
5894 rdev->recovery_offset = mddev->curr_resync;
5897 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5900 mddev->curr_resync = 0;
5901 mddev->resync_min = 0;
5902 mddev->resync_max = MaxSector;
5903 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5904 wake_up(&resync_wait);
5905 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5906 md_wakeup_thread(mddev->thread);
5911 * got a signal, exit.
5914 "md: md_do_sync() got signal ... exiting\n");
5915 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5919 EXPORT_SYMBOL_GPL(md_do_sync);
5922 static int remove_and_add_spares(mddev_t *mddev)
5925 struct list_head *rtmp;
5928 rdev_for_each(rdev, rtmp, mddev)
5929 if (rdev->raid_disk >= 0 &&
5930 !test_bit(Blocked, &rdev->flags) &&
5931 (test_bit(Faulty, &rdev->flags) ||
5932 ! test_bit(In_sync, &rdev->flags)) &&
5933 atomic_read(&rdev->nr_pending)==0) {
5934 if (mddev->pers->hot_remove_disk(
5935 mddev, rdev->raid_disk)==0) {
5937 sprintf(nm,"rd%d", rdev->raid_disk);
5938 sysfs_remove_link(&mddev->kobj, nm);
5939 rdev->raid_disk = -1;
5943 if (mddev->degraded) {
5944 rdev_for_each(rdev, rtmp, mddev) {
5945 if (rdev->raid_disk >= 0 &&
5946 !test_bit(In_sync, &rdev->flags))
5948 if (rdev->raid_disk < 0
5949 && !test_bit(Faulty, &rdev->flags)) {
5950 rdev->recovery_offset = 0;
5952 hot_add_disk(mddev, rdev) == 0) {
5954 sprintf(nm, "rd%d", rdev->raid_disk);
5955 if (sysfs_create_link(&mddev->kobj,
5958 "md: cannot register "
5962 md_new_event(mddev);
5971 * This routine is regularly called by all per-raid-array threads to
5972 * deal with generic issues like resync and super-block update.
5973 * Raid personalities that don't have a thread (linear/raid0) do not
5974 * need this as they never do any recovery or update the superblock.
5976 * It does not do any resync itself, but rather "forks" off other threads
5977 * to do that as needed.
5978 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5979 * "->recovery" and create a thread at ->sync_thread.
5980 * When the thread finishes it sets MD_RECOVERY_DONE
5981 * and wakeups up this thread which will reap the thread and finish up.
5982 * This thread also removes any faulty devices (with nr_pending == 0).
5984 * The overall approach is:
5985 * 1/ if the superblock needs updating, update it.
5986 * 2/ If a recovery thread is running, don't do anything else.
5987 * 3/ If recovery has finished, clean up, possibly marking spares active.
5988 * 4/ If there are any faulty devices, remove them.
5989 * 5/ If array is degraded, try to add spares devices
5990 * 6/ If array has spares or is not in-sync, start a resync thread.
5992 void md_check_recovery(mddev_t *mddev)
5995 struct list_head *rtmp;
5999 bitmap_daemon_work(mddev->bitmap);
6004 if (signal_pending(current)) {
6005 if (mddev->pers->sync_request && !mddev->external) {
6006 printk(KERN_INFO "md: %s in immediate safe mode\n",
6008 mddev->safemode = 2;
6010 flush_signals(current);
6014 (mddev->flags && !mddev->external) ||
6015 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6016 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6017 (mddev->external == 0 && mddev->safemode == 1) ||
6018 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6019 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6023 if (mddev_trylock(mddev)) {
6026 if (!mddev->external) {
6028 spin_lock_irq(&mddev->write_lock);
6029 if (mddev->safemode &&
6030 !atomic_read(&mddev->writes_pending) &&
6032 mddev->recovery_cp == MaxSector) {
6035 if (mddev->persistent)
6036 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6038 if (mddev->safemode == 1)
6039 mddev->safemode = 0;
6040 spin_unlock_irq(&mddev->write_lock);
6042 sysfs_notify(&mddev->kobj, NULL, "array_state");
6046 md_update_sb(mddev, 0);
6048 rdev_for_each(rdev, rtmp, mddev)
6049 if (test_and_clear_bit(StateChanged, &rdev->flags))
6050 sysfs_notify(&rdev->kobj, NULL, "state");
6053 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6054 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6055 /* resync/recovery still happening */
6056 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6059 if (mddev->sync_thread) {
6060 /* resync has finished, collect result */
6061 md_unregister_thread(mddev->sync_thread);
6062 mddev->sync_thread = NULL;
6063 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6065 /* activate any spares */
6066 if (mddev->pers->spare_active(mddev))
6067 sysfs_notify(&mddev->kobj, NULL,
6070 md_update_sb(mddev, 1);
6072 /* if array is no-longer degraded, then any saved_raid_disk
6073 * information must be scrapped
6075 if (!mddev->degraded)
6076 rdev_for_each(rdev, rtmp, mddev)
6077 rdev->saved_raid_disk = -1;
6079 mddev->recovery = 0;
6080 /* flag recovery needed just to double check */
6081 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6082 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6083 md_new_event(mddev);
6086 /* Set RUNNING before clearing NEEDED to avoid
6087 * any transients in the value of "sync_action".
6089 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6090 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6091 /* Clear some bits that don't mean anything, but
6094 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6095 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6097 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6099 /* no recovery is running.
6100 * remove any failed drives, then
6101 * add spares if possible.
6102 * Spare are also removed and re-added, to allow
6103 * the personality to fail the re-add.
6106 if (mddev->reshape_position != MaxSector) {
6107 if (mddev->pers->check_reshape(mddev) != 0)
6108 /* Cannot proceed */
6110 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6111 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6112 } else if ((spares = remove_and_add_spares(mddev))) {
6113 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6114 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6115 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6116 } else if (mddev->recovery_cp < MaxSector) {
6117 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6118 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6119 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6120 /* nothing to be done ... */
6123 if (mddev->pers->sync_request) {
6124 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6125 /* We are adding a device or devices to an array
6126 * which has the bitmap stored on all devices.
6127 * So make sure all bitmap pages get written
6129 bitmap_write_all(mddev->bitmap);
6131 mddev->sync_thread = md_register_thread(md_do_sync,
6134 if (!mddev->sync_thread) {
6135 printk(KERN_ERR "%s: could not start resync"
6138 /* leave the spares where they are, it shouldn't hurt */
6139 mddev->recovery = 0;
6141 md_wakeup_thread(mddev->sync_thread);
6142 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6143 md_new_event(mddev);
6146 if (!mddev->sync_thread) {
6147 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6148 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6150 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6152 mddev_unlock(mddev);
6156 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6158 sysfs_notify(&rdev->kobj, NULL, "state");
6159 wait_event_timeout(rdev->blocked_wait,
6160 !test_bit(Blocked, &rdev->flags),
6161 msecs_to_jiffies(5000));
6162 rdev_dec_pending(rdev, mddev);
6164 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6166 static int md_notify_reboot(struct notifier_block *this,
6167 unsigned long code, void *x)
6169 struct list_head *tmp;
6172 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6174 printk(KERN_INFO "md: stopping all md devices.\n");
6176 for_each_mddev(mddev, tmp)
6177 if (mddev_trylock(mddev)) {
6178 do_md_stop (mddev, 1);
6179 mddev_unlock(mddev);
6182 * certain more exotic SCSI devices are known to be
6183 * volatile wrt too early system reboots. While the
6184 * right place to handle this issue is the given
6185 * driver, we do want to have a safe RAID driver ...
6192 static struct notifier_block md_notifier = {
6193 .notifier_call = md_notify_reboot,
6195 .priority = INT_MAX, /* before any real devices */
6198 static void md_geninit(void)
6200 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6202 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6205 static int __init md_init(void)
6207 if (register_blkdev(MAJOR_NR, "md"))
6209 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6210 unregister_blkdev(MAJOR_NR, "md");
6213 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6214 md_probe, NULL, NULL);
6215 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6216 md_probe, NULL, NULL);
6218 register_reboot_notifier(&md_notifier);
6219 raid_table_header = register_sysctl_table(raid_root_table);
6229 * Searches all registered partitions for autorun RAID arrays
6233 static LIST_HEAD(all_detected_devices);
6234 struct detected_devices_node {
6235 struct list_head list;
6239 void md_autodetect_dev(dev_t dev)
6241 struct detected_devices_node *node_detected_dev;
6243 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6244 if (node_detected_dev) {
6245 node_detected_dev->dev = dev;
6246 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6248 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6249 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6254 static void autostart_arrays(int part)
6257 struct detected_devices_node *node_detected_dev;
6259 int i_scanned, i_passed;
6264 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6266 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6268 node_detected_dev = list_entry(all_detected_devices.next,
6269 struct detected_devices_node, list);
6270 list_del(&node_detected_dev->list);
6271 dev = node_detected_dev->dev;
6272 kfree(node_detected_dev);
6273 rdev = md_import_device(dev,0, 90);
6277 if (test_bit(Faulty, &rdev->flags)) {
6281 set_bit(AutoDetected, &rdev->flags);
6282 list_add(&rdev->same_set, &pending_raid_disks);
6286 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6287 i_scanned, i_passed);
6289 autorun_devices(part);
6292 #endif /* !MODULE */
6294 static __exit void md_exit(void)
6297 struct list_head *tmp;
6299 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6300 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6302 unregister_blkdev(MAJOR_NR,"md");
6303 unregister_blkdev(mdp_major, "mdp");
6304 unregister_reboot_notifier(&md_notifier);
6305 unregister_sysctl_table(raid_table_header);
6306 remove_proc_entry("mdstat", NULL);
6307 for_each_mddev(mddev, tmp) {
6308 struct gendisk *disk = mddev->gendisk;
6311 export_array(mddev);
6314 mddev->gendisk = NULL;
6319 subsys_initcall(md_init);
6320 module_exit(md_exit)
6322 static int get_ro(char *buffer, struct kernel_param *kp)
6324 return sprintf(buffer, "%d", start_readonly);
6326 static int set_ro(const char *val, struct kernel_param *kp)
6329 int num = simple_strtoul(val, &e, 10);
6330 if (*val && (*e == '\0' || *e == '\n')) {
6331 start_readonly = num;
6337 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6338 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6341 EXPORT_SYMBOL(register_md_personality);
6342 EXPORT_SYMBOL(unregister_md_personality);
6343 EXPORT_SYMBOL(md_error);
6344 EXPORT_SYMBOL(md_done_sync);
6345 EXPORT_SYMBOL(md_write_start);
6346 EXPORT_SYMBOL(md_write_end);
6347 EXPORT_SYMBOL(md_register_thread);
6348 EXPORT_SYMBOL(md_unregister_thread);
6349 EXPORT_SYMBOL(md_wakeup_thread);
6350 EXPORT_SYMBOL(md_check_recovery);
6351 MODULE_LICENSE("GPL");
6353 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);