Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 3766 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
new file mode 100644
index 00000000000..04562add192
--- /dev/null
+++ b/drivers/md/md.c
@@ -0,0 +1,3766 @@
+/*
+   md.c : Multiple Devices driver for Linux
+	  Copyright (C) 1998, 1999, 2000 Ingo Molnar
+
+     completely rewritten, based on the MD driver code from Marc Zyngier
+
+   Changes:
+
+   - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
+   - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
+   - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
+   - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
+   - kmod support by: Cyrus Durgin
+   - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
+   - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
+
+   - lots of fixes and improvements to the RAID1/RAID5 and generic
+     RAID code (such as request based resynchronization):
+
+     Neil Brown <neilb@cse.unsw.edu.au>.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <linux/raid/md.h>
+#include <linux/sysctl.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/buffer_head.h> /* for invalidate_bdev */
+#include <linux/suspend.h>
+
+#include <linux/init.h>
+
+#ifdef CONFIG_KMOD
+#include <linux/kmod.h>
+#endif
+
+#include <asm/unaligned.h>
+
+#define MAJOR_NR MD_MAJOR
+#define MD_DRIVER
+
+/* 63 partitions with the alternate major number (mdp) */
+#define MdpMinorShift 6
+
+#define DEBUG 0
+#define dprintk(x...) ((void)(DEBUG && printk(x)))
+
+
+#ifndef MODULE
+static void autostart_arrays (int part);
+#endif
+
+static mdk_personality_t *pers[MAX_PERSONALITY];
+static DEFINE_SPINLOCK(pers_lock);
+
+/*
+ * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
+ * is 1000 KB/sec, so the extra system load does not show up that much.
+ * Increase it if you want to have more _guaranteed_ speed. Note that
+ * the RAID driver will use the maximum available bandwith if the IO
+ * subsystem is idle. There is also an 'absolute maximum' reconstruction
+ * speed limit - in case reconstruction slows down your system despite
+ * idle IO detection.
+ *
+ * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
+ */
+
+static int sysctl_speed_limit_min = 1000;
+static int sysctl_speed_limit_max = 200000;
+
+static struct ctl_table_header *raid_table_header;
+
+static ctl_table raid_table[] = {
+	{
+		.ctl_name	= DEV_RAID_SPEED_LIMIT_MIN,
+		.procname	= "speed_limit_min",
+		.data		= &sysctl_speed_limit_min,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= DEV_RAID_SPEED_LIMIT_MAX,
+		.procname	= "speed_limit_max",
+		.data		= &sysctl_speed_limit_max,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table raid_dir_table[] = {
+	{
+		.ctl_name	= DEV_RAID,
+		.procname	= "raid",
+		.maxlen		= 0,
+		.mode		= 0555,
+		.child		= raid_table,
+	},
+	{ .ctl_name = 0 }
+};
+
+static ctl_table raid_root_table[] = {
+	{
+		.ctl_name	= CTL_DEV,
+		.procname	= "dev",
+		.maxlen		= 0,
+		.mode		= 0555,
+		.child		= raid_dir_table,
+	},
+	{ .ctl_name = 0 }
+};
+
+static struct block_device_operations md_fops;
+
+/*
+ * Enables to iterate over all existing md arrays
+ * all_mddevs_lock protects this list.
+ */
+static LIST_HEAD(all_mddevs);
+static DEFINE_SPINLOCK(all_mddevs_lock);
+
+
+/*
+ * iterates through all used mddevs in the system.
+ * We take care to grab the all_mddevs_lock whenever navigating
+ * the list, and to always hold a refcount when unlocked.
+ * Any code which breaks out of this loop while own
+ * a reference to the current mddev and must mddev_put it.
+ */
+#define ITERATE_MDDEV(mddev,tmp)					\
+									\
+	for (({ spin_lock(&all_mddevs_lock); 				\
+		tmp = all_mddevs.next;					\
+		mddev = NULL;});					\
+	     ({ if (tmp != &all_mddevs)					\
+			mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
+		spin_unlock(&all_mddevs_lock);				\
+		if (mddev) mddev_put(mddev);				\
+		mddev = list_entry(tmp, mddev_t, all_mddevs);		\
+		tmp != &all_mddevs;});					\
+	     ({ spin_lock(&all_mddevs_lock);				\
+		tmp = tmp->next;})					\
+		)
+
+
+static int md_fail_request (request_queue_t *q, struct bio *bio)
+{
+	bio_io_error(bio, bio->bi_size);
+	return 0;
+}
+
+static inline mddev_t *mddev_get(mddev_t *mddev)
+{
+	atomic_inc(&mddev->active);
+	return mddev;
+}
+
+static void mddev_put(mddev_t *mddev)
+{
+	if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
+		return;
+	if (!mddev->raid_disks && list_empty(&mddev->disks)) {
+		list_del(&mddev->all_mddevs);
+		blk_put_queue(mddev->queue);
+		kfree(mddev);
+	}
+	spin_unlock(&all_mddevs_lock);
+}
+
+static mddev_t * mddev_find(dev_t unit)
+{
+	mddev_t *mddev, *new = NULL;
+
+ retry:
+	spin_lock(&all_mddevs_lock);
+	list_for_each_entry(mddev, &all_mddevs, all_mddevs)
+		if (mddev->unit == unit) {
+			mddev_get(mddev);
+			spin_unlock(&all_mddevs_lock);
+			if (new)
+				kfree(new);
+			return mddev;
+		}
+
+	if (new) {
+		list_add(&new->all_mddevs, &all_mddevs);
+		spin_unlock(&all_mddevs_lock);
+		return new;
+	}
+	spin_unlock(&all_mddevs_lock);
+
+	new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL);
+	if (!new)
+		return NULL;
+
+	memset(new, 0, sizeof(*new));
+
+	new->unit = unit;
+	if (MAJOR(unit) == MD_MAJOR)
+		new->md_minor = MINOR(unit);
+	else
+		new->md_minor = MINOR(unit) >> MdpMinorShift;
+
+	init_MUTEX(&new->reconfig_sem);
+	INIT_LIST_HEAD(&new->disks);
+	INIT_LIST_HEAD(&new->all_mddevs);
+	init_timer(&new->safemode_timer);
+	atomic_set(&new->active, 1);
+
+	new->queue = blk_alloc_queue(GFP_KERNEL);
+	if (!new->queue) {
+		kfree(new);
+		return NULL;
+	}
+
+	blk_queue_make_request(new->queue, md_fail_request);
+
+	goto retry;
+}
+
+static inline int mddev_lock(mddev_t * mddev)
+{
+	return down_interruptible(&mddev->reconfig_sem);
+}
+
+static inline void mddev_lock_uninterruptible(mddev_t * mddev)
+{
+	down(&mddev->reconfig_sem);
+}
+
+static inline int mddev_trylock(mddev_t * mddev)
+{
+	return down_trylock(&mddev->reconfig_sem);
+}
+
+static inline void mddev_unlock(mddev_t * mddev)
+{
+	up(&mddev->reconfig_sem);
+
+	if (mddev->thread)
+		md_wakeup_thread(mddev->thread);
+}
+
+mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
+{
+	mdk_rdev_t * rdev;
+	struct list_head *tmp;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->desc_nr == nr)
+			return rdev;
+	}
+	return NULL;
+}
+
+static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
+{
+	struct list_head *tmp;
+	mdk_rdev_t *rdev;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->bdev->bd_dev == dev)
+			return rdev;
+	}
+	return NULL;
+}
+
+inline static sector_t calc_dev_sboffset(struct block_device *bdev)
+{
+	sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
+	return MD_NEW_SIZE_BLOCKS(size);
+}
+
+static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
+{
+	sector_t size;
+
+	size = rdev->sb_offset;
+
+	if (chunk_size)
+		size &= ~((sector_t)chunk_size/1024 - 1);
+	return size;
+}
+
+static int alloc_disk_sb(mdk_rdev_t * rdev)
+{
+	if (rdev->sb_page)
+		MD_BUG();
+
+	rdev->sb_page = alloc_page(GFP_KERNEL);
+	if (!rdev->sb_page) {
+		printk(KERN_ALERT "md: out of memory.\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void free_disk_sb(mdk_rdev_t * rdev)
+{
+	if (rdev->sb_page) {
+		page_cache_release(rdev->sb_page);
+		rdev->sb_loaded = 0;
+		rdev->sb_page = NULL;
+		rdev->sb_offset = 0;
+		rdev->size = 0;
+	}
+}
+
+
+static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
+{
+	if (bio->bi_size)
+		return 1;
+
+	complete((struct completion*)bio->bi_private);
+	return 0;
+}
+
+static int sync_page_io(struct block_device *bdev, sector_t sector, int size,
+		   struct page *page, int rw)
+{
+	struct bio *bio = bio_alloc(GFP_KERNEL, 1);
+	struct completion event;
+	int ret;
+
+	rw |= (1 << BIO_RW_SYNC);
+
+	bio->bi_bdev = bdev;
+	bio->bi_sector = sector;
+	bio_add_page(bio, page, size, 0);
+	init_completion(&event);
+	bio->bi_private = &event;
+	bio->bi_end_io = bi_complete;
+	submit_bio(rw, bio);
+	wait_for_completion(&event);
+
+	ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
+	bio_put(bio);
+	return ret;
+}
+
+static int read_disk_sb(mdk_rdev_t * rdev)
+{
+	char b[BDEVNAME_SIZE];
+	if (!rdev->sb_page) {
+		MD_BUG();
+		return -EINVAL;
+	}
+	if (rdev->sb_loaded)
+		return 0;
+
+
+	if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, MD_SB_BYTES, rdev->sb_page, READ))
+		goto fail;
+	rdev->sb_loaded = 1;
+	return 0;
+
+fail:
+	printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
+		bdevname(rdev->bdev,b));
+	return -EINVAL;
+}
+
+static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
+{
+	if (	(sb1->set_uuid0 == sb2->set_uuid0) &&
+		(sb1->set_uuid1 == sb2->set_uuid1) &&
+		(sb1->set_uuid2 == sb2->set_uuid2) &&
+		(sb1->set_uuid3 == sb2->set_uuid3))
+
+		return 1;
+
+	return 0;
+}
+
+
+static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
+{
+	int ret;
+	mdp_super_t *tmp1, *tmp2;
+
+	tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
+	tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
+
+	if (!tmp1 || !tmp2) {
+		ret = 0;
+		printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
+		goto abort;
+	}
+
+	*tmp1 = *sb1;
+	*tmp2 = *sb2;
+
+	/*
+	 * nr_disks is not constant
+	 */
+	tmp1->nr_disks = 0;
+	tmp2->nr_disks = 0;
+
+	if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
+		ret = 0;
+	else
+		ret = 1;
+
+abort:
+	if (tmp1)
+		kfree(tmp1);
+	if (tmp2)
+		kfree(tmp2);
+
+	return ret;
+}
+
+static unsigned int calc_sb_csum(mdp_super_t * sb)
+{
+	unsigned int disk_csum, csum;
+
+	disk_csum = sb->sb_csum;
+	sb->sb_csum = 0;
+	csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
+	sb->sb_csum = disk_csum;
+	return csum;
+}
+
+
+/*
+ * Handle superblock details.
+ * We want to be able to handle multiple superblock formats
+ * so we have a common interface to them all, and an array of
+ * different handlers.
+ * We rely on user-space to write the initial superblock, and support
+ * reading and updating of superblocks.
+ * Interface methods are:
+ *   int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
+ *      loads and validates a superblock on dev.
+ *      if refdev != NULL, compare superblocks on both devices
+ *    Return:
+ *      0 - dev has a superblock that is compatible with refdev
+ *      1 - dev has a superblock that is compatible and newer than refdev
+ *          so dev should be used as the refdev in future
+ *     -EINVAL superblock incompatible or invalid
+ *     -othererror e.g. -EIO
+ *
+ *   int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
+ *      Verify that dev is acceptable into mddev.
+ *       The first time, mddev->raid_disks will be 0, and data from
+ *       dev should be merged in.  Subsequent calls check that dev
+ *       is new enough.  Return 0 or -EINVAL
+ *
+ *   void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
+ *     Update the superblock for rdev with data in mddev
+ *     This does not write to disc.
+ *
+ */
+
+struct super_type  {
+	char 		*name;
+	struct module	*owner;
+	int		(*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
+	int		(*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
+	void		(*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
+};
+
+/*
+ * load_super for 0.90.0 
+ */
+static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
+{
+	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+	mdp_super_t *sb;
+	int ret;
+	sector_t sb_offset;
+
+	/*
+	 * Calculate the position of the superblock,
+	 * it's at the end of the disk.
+	 *
+	 * It also happens to be a multiple of 4Kb.
+	 */
+	sb_offset = calc_dev_sboffset(rdev->bdev);
+	rdev->sb_offset = sb_offset;
+
+	ret = read_disk_sb(rdev);
+	if (ret) return ret;
+
+	ret = -EINVAL;
+
+	bdevname(rdev->bdev, b);
+	sb = (mdp_super_t*)page_address(rdev->sb_page);
+
+	if (sb->md_magic != MD_SB_MAGIC) {
+		printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
+		       b);
+		goto abort;
+	}
+
+	if (sb->major_version != 0 ||
+	    sb->minor_version != 90) {
+		printk(KERN_WARNING "Bad version number %d.%d on %s\n",
+			sb->major_version, sb->minor_version,
+			b);
+		goto abort;
+	}
+
+	if (sb->raid_disks <= 0)
+		goto abort;
+
+	if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
+		printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
+			b);
+		goto abort;
+	}
+
+	rdev->preferred_minor = sb->md_minor;
+	rdev->data_offset = 0;
+
+	if (sb->level == LEVEL_MULTIPATH)
+		rdev->desc_nr = -1;
+	else
+		rdev->desc_nr = sb->this_disk.number;
+
+	if (refdev == 0)
+		ret = 1;
+	else {
+		__u64 ev1, ev2;
+		mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
+		if (!uuid_equal(refsb, sb)) {
+			printk(KERN_WARNING "md: %s has different UUID to %s\n",
+				b, bdevname(refdev->bdev,b2));
+			goto abort;
+		}
+		if (!sb_equal(refsb, sb)) {
+			printk(KERN_WARNING "md: %s has same UUID"
+			       " but different superblock to %s\n",
+			       b, bdevname(refdev->bdev, b2));
+			goto abort;
+		}
+		ev1 = md_event(sb);
+		ev2 = md_event(refsb);
+		if (ev1 > ev2)
+			ret = 1;
+		else 
+			ret = 0;
+	}
+	rdev->size = calc_dev_size(rdev, sb->chunk_size);
+
+ abort:
+	return ret;
+}
+
+/*
+ * validate_super for 0.90.0
+ */
+static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+	mdp_disk_t *desc;
+	mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
+
+	if (mddev->raid_disks == 0) {
+		mddev->major_version = 0;
+		mddev->minor_version = sb->minor_version;
+		mddev->patch_version = sb->patch_version;
+		mddev->persistent = ! sb->not_persistent;
+		mddev->chunk_size = sb->chunk_size;
+		mddev->ctime = sb->ctime;
+		mddev->utime = sb->utime;
+		mddev->level = sb->level;
+		mddev->layout = sb->layout;
+		mddev->raid_disks = sb->raid_disks;
+		mddev->size = sb->size;
+		mddev->events = md_event(sb);
+
+		if (sb->state & (1<<MD_SB_CLEAN))
+			mddev->recovery_cp = MaxSector;
+		else {
+			if (sb->events_hi == sb->cp_events_hi && 
+				sb->events_lo == sb->cp_events_lo) {
+				mddev->recovery_cp = sb->recovery_cp;
+			} else
+				mddev->recovery_cp = 0;
+		}
+
+		memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
+		memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
+		memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
+		memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
+
+		mddev->max_disks = MD_SB_DISKS;
+	} else {
+		__u64 ev1;
+		ev1 = md_event(sb);
+		++ev1;
+		if (ev1 < mddev->events) 
+			return -EINVAL;
+	}
+	if (mddev->level != LEVEL_MULTIPATH) {
+		rdev->raid_disk = -1;
+		rdev->in_sync = rdev->faulty = 0;
+		desc = sb->disks + rdev->desc_nr;
+
+		if (desc->state & (1<<MD_DISK_FAULTY))
+			rdev->faulty = 1;
+		else if (desc->state & (1<<MD_DISK_SYNC) &&
+			 desc->raid_disk < mddev->raid_disks) {
+			rdev->in_sync = 1;
+			rdev->raid_disk = desc->raid_disk;
+		}
+	}
+	return 0;
+}
+
+/*
+ * sync_super for 0.90.0
+ */
+static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+	mdp_super_t *sb;
+	struct list_head *tmp;
+	mdk_rdev_t *rdev2;
+	int next_spare = mddev->raid_disks;
+
+	/* make rdev->sb match mddev data..
+	 *
+	 * 1/ zero out disks
+	 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
+	 * 3/ any empty disks < next_spare become removed
+	 *
+	 * disks[0] gets initialised to REMOVED because
+	 * we cannot be sure from other fields if it has
+	 * been initialised or not.
+	 */
+	int i;
+	int active=0, working=0,failed=0,spare=0,nr_disks=0;
+
+	sb = (mdp_super_t*)page_address(rdev->sb_page);
+
+	memset(sb, 0, sizeof(*sb));
+
+	sb->md_magic = MD_SB_MAGIC;
+	sb->major_version = mddev->major_version;
+	sb->minor_version = mddev->minor_version;
+	sb->patch_version = mddev->patch_version;
+	sb->gvalid_words  = 0; /* ignored */
+	memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
+	memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
+	memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
+	memcpy(&sb->set_uuid3, mddev->uuid+12,4);
+
+	sb->ctime = mddev->ctime;
+	sb->level = mddev->level;
+	sb->size  = mddev->size;
+	sb->raid_disks = mddev->raid_disks;
+	sb->md_minor = mddev->md_minor;
+	sb->not_persistent = !mddev->persistent;
+	sb->utime = mddev->utime;
+	sb->state = 0;
+	sb->events_hi = (mddev->events>>32);
+	sb->events_lo = (u32)mddev->events;
+
+	if (mddev->in_sync)
+	{
+		sb->recovery_cp = mddev->recovery_cp;
+		sb->cp_events_hi = (mddev->events>>32);
+		sb->cp_events_lo = (u32)mddev->events;
+		if (mddev->recovery_cp == MaxSector)
+			sb->state = (1<< MD_SB_CLEAN);
+	} else
+		sb->recovery_cp = 0;
+
+	sb->layout = mddev->layout;
+	sb->chunk_size = mddev->chunk_size;
+
+	sb->disks[0].state = (1<<MD_DISK_REMOVED);
+	ITERATE_RDEV(mddev,rdev2,tmp) {
+		mdp_disk_t *d;
+		if (rdev2->raid_disk >= 0 && rdev2->in_sync && !rdev2->faulty)
+			rdev2->desc_nr = rdev2->raid_disk;
+		else
+			rdev2->desc_nr = next_spare++;
+		d = &sb->disks[rdev2->desc_nr];
+		nr_disks++;
+		d->number = rdev2->desc_nr;
+		d->major = MAJOR(rdev2->bdev->bd_dev);
+		d->minor = MINOR(rdev2->bdev->bd_dev);
+		if (rdev2->raid_disk >= 0 && rdev->in_sync && !rdev2->faulty)
+			d->raid_disk = rdev2->raid_disk;
+		else
+			d->raid_disk = rdev2->desc_nr; /* compatibility */
+		if (rdev2->faulty) {
+			d->state = (1<<MD_DISK_FAULTY);
+			failed++;
+		} else if (rdev2->in_sync) {
+			d->state = (1<<MD_DISK_ACTIVE);
+			d->state |= (1<<MD_DISK_SYNC);
+			active++;
+			working++;
+		} else {
+			d->state = 0;
+			spare++;
+			working++;
+		}
+	}
+	
+	/* now set the "removed" and "faulty" bits on any missing devices */
+	for (i=0 ; i < mddev->raid_disks ; i++) {
+		mdp_disk_t *d = &sb->disks[i];
+		if (d->state == 0 && d->number == 0) {
+			d->number = i;
+			d->raid_disk = i;
+			d->state = (1<<MD_DISK_REMOVED);
+			d->state |= (1<<MD_DISK_FAULTY);
+			failed++;
+		}
+	}
+	sb->nr_disks = nr_disks;
+	sb->active_disks = active;
+	sb->working_disks = working;
+	sb->failed_disks = failed;
+	sb->spare_disks = spare;
+
+	sb->this_disk = sb->disks[rdev->desc_nr];
+	sb->sb_csum = calc_sb_csum(sb);
+}
+
+/*
+ * version 1 superblock
+ */
+
+static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
+{
+	unsigned int disk_csum, csum;
+	unsigned long long newcsum;
+	int size = 256 + le32_to_cpu(sb->max_dev)*2;
+	unsigned int *isuper = (unsigned int*)sb;
+	int i;
+
+	disk_csum = sb->sb_csum;
+	sb->sb_csum = 0;
+	newcsum = 0;
+	for (i=0; size>=4; size -= 4 )
+		newcsum += le32_to_cpu(*isuper++);
+
+	if (size == 2)
+		newcsum += le16_to_cpu(*(unsigned short*) isuper);
+
+	csum = (newcsum & 0xffffffff) + (newcsum >> 32);
+	sb->sb_csum = disk_csum;
+	return cpu_to_le32(csum);
+}
+
+static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
+{
+	struct mdp_superblock_1 *sb;
+	int ret;
+	sector_t sb_offset;
+	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+
+	/*
+	 * Calculate the position of the superblock.
+	 * It is always aligned to a 4K boundary and
+	 * depeding on minor_version, it can be:
+	 * 0: At least 8K, but less than 12K, from end of device
+	 * 1: At start of device
+	 * 2: 4K from start of device.
+	 */
+	switch(minor_version) {
+	case 0:
+		sb_offset = rdev->bdev->bd_inode->i_size >> 9;
+		sb_offset -= 8*2;
+		sb_offset &= ~(4*2-1);
+		/* convert from sectors to K */
+		sb_offset /= 2;
+		break;
+	case 1:
+		sb_offset = 0;
+		break;
+	case 2:
+		sb_offset = 4;
+		break;
+	default:
+		return -EINVAL;
+	}
+	rdev->sb_offset = sb_offset;
+
+	ret = read_disk_sb(rdev);
+	if (ret) return ret;
+
+
+	sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+
+	if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
+	    sb->major_version != cpu_to_le32(1) ||
+	    le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
+	    le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
+	    sb->feature_map != 0)
+		return -EINVAL;
+
+	if (calc_sb_1_csum(sb) != sb->sb_csum) {
+		printk("md: invalid superblock checksum on %s\n",
+			bdevname(rdev->bdev,b));
+		return -EINVAL;
+	}
+	if (le64_to_cpu(sb->data_size) < 10) {
+		printk("md: data_size too small on %s\n",
+		       bdevname(rdev->bdev,b));
+		return -EINVAL;
+	}
+	rdev->preferred_minor = 0xffff;
+	rdev->data_offset = le64_to_cpu(sb->data_offset);
+
+	if (refdev == 0)
+		return 1;
+	else {
+		__u64 ev1, ev2;
+		struct mdp_superblock_1 *refsb = 
+			(struct mdp_superblock_1*)page_address(refdev->sb_page);
+
+		if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
+		    sb->level != refsb->level ||
+		    sb->layout != refsb->layout ||
+		    sb->chunksize != refsb->chunksize) {
+			printk(KERN_WARNING "md: %s has strangely different"
+				" superblock to %s\n",
+				bdevname(rdev->bdev,b),
+				bdevname(refdev->bdev,b2));
+			return -EINVAL;
+		}
+		ev1 = le64_to_cpu(sb->events);
+		ev2 = le64_to_cpu(refsb->events);
+
+		if (ev1 > ev2)
+			return 1;
+	}
+	if (minor_version) 
+		rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
+	else
+		rdev->size = rdev->sb_offset;
+	if (rdev->size < le64_to_cpu(sb->data_size)/2)
+		return -EINVAL;
+	rdev->size = le64_to_cpu(sb->data_size)/2;
+	if (le32_to_cpu(sb->chunksize))
+		rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
+	return 0;
+}
+
+static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+	struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+
+	if (mddev->raid_disks == 0) {
+		mddev->major_version = 1;
+		mddev->patch_version = 0;
+		mddev->persistent = 1;
+		mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
+		mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
+		mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
+		mddev->level = le32_to_cpu(sb->level);
+		mddev->layout = le32_to_cpu(sb->layout);
+		mddev->raid_disks = le32_to_cpu(sb->raid_disks);
+		mddev->size = le64_to_cpu(sb->size)/2;
+		mddev->events = le64_to_cpu(sb->events);
+		
+		mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
+		memcpy(mddev->uuid, sb->set_uuid, 16);
+
+		mddev->max_disks =  (4096-256)/2;
+	} else {
+		__u64 ev1;
+		ev1 = le64_to_cpu(sb->events);
+		++ev1;
+		if (ev1 < mddev->events)
+			return -EINVAL;
+	}
+
+	if (mddev->level != LEVEL_MULTIPATH) {
+		int role;
+		rdev->desc_nr = le32_to_cpu(sb->dev_number);
+		role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
+		switch(role) {
+		case 0xffff: /* spare */
+			rdev->in_sync = 0;
+			rdev->faulty = 0;
+			rdev->raid_disk = -1;
+			break;
+		case 0xfffe: /* faulty */
+			rdev->in_sync = 0;
+			rdev->faulty = 1;
+			rdev->raid_disk = -1;
+			break;
+		default:
+			rdev->in_sync = 1;
+			rdev->faulty = 0;
+			rdev->raid_disk = role;
+			break;
+		}
+	}
+	return 0;
+}
+
+static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+	struct mdp_superblock_1 *sb;
+	struct list_head *tmp;
+	mdk_rdev_t *rdev2;
+	int max_dev, i;
+	/* make rdev->sb match mddev and rdev data. */
+
+	sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
+
+	sb->feature_map = 0;
+	sb->pad0 = 0;
+	memset(sb->pad1, 0, sizeof(sb->pad1));
+	memset(sb->pad2, 0, sizeof(sb->pad2));
+	memset(sb->pad3, 0, sizeof(sb->pad3));
+
+	sb->utime = cpu_to_le64((__u64)mddev->utime);
+	sb->events = cpu_to_le64(mddev->events);
+	if (mddev->in_sync)
+		sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
+	else
+		sb->resync_offset = cpu_to_le64(0);
+
+	max_dev = 0;
+	ITERATE_RDEV(mddev,rdev2,tmp)
+		if (rdev2->desc_nr+1 > max_dev)
+			max_dev = rdev2->desc_nr+1;
+	
+	sb->max_dev = cpu_to_le32(max_dev);
+	for (i=0; i<max_dev;i++)
+		sb->dev_roles[i] = cpu_to_le16(0xfffe);
+	
+	ITERATE_RDEV(mddev,rdev2,tmp) {
+		i = rdev2->desc_nr;
+		if (rdev2->faulty)
+			sb->dev_roles[i] = cpu_to_le16(0xfffe);
+		else if (rdev2->in_sync)
+			sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
+		else
+			sb->dev_roles[i] = cpu_to_le16(0xffff);
+	}
+
+	sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
+	sb->sb_csum = calc_sb_1_csum(sb);
+}
+
+
+struct super_type super_types[] = {
+	[0] = {
+		.name	= "0.90.0",
+		.owner	= THIS_MODULE,
+		.load_super	= super_90_load,
+		.validate_super	= super_90_validate,
+		.sync_super	= super_90_sync,
+	},
+	[1] = {
+		.name	= "md-1",
+		.owner	= THIS_MODULE,
+		.load_super	= super_1_load,
+		.validate_super	= super_1_validate,
+		.sync_super	= super_1_sync,
+	},
+};
+	
+static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
+{
+	struct list_head *tmp;
+	mdk_rdev_t *rdev;
+
+	ITERATE_RDEV(mddev,rdev,tmp)
+		if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
+			return rdev;
+
+	return NULL;
+}
+
+static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
+{
+	struct list_head *tmp;
+	mdk_rdev_t *rdev;
+
+	ITERATE_RDEV(mddev1,rdev,tmp)
+		if (match_dev_unit(mddev2, rdev))
+			return 1;
+
+	return 0;
+}
+
+static LIST_HEAD(pending_raid_disks);
+
+static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
+{
+	mdk_rdev_t *same_pdev;
+	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+
+	if (rdev->mddev) {
+		MD_BUG();
+		return -EINVAL;
+	}
+	same_pdev = match_dev_unit(mddev, rdev);
+	if (same_pdev)
+		printk(KERN_WARNING
+			"%s: WARNING: %s appears to be on the same physical"
+	 		" disk as %s. True\n     protection against single-disk"
+			" failure might be compromised.\n",
+			mdname(mddev), bdevname(rdev->bdev,b),
+			bdevname(same_pdev->bdev,b2));
+
+	/* Verify rdev->desc_nr is unique.
+	 * If it is -1, assign a free number, else
+	 * check number is not in use
+	 */
+	if (rdev->desc_nr < 0) {
+		int choice = 0;
+		if (mddev->pers) choice = mddev->raid_disks;
+		while (find_rdev_nr(mddev, choice))
+			choice++;
+		rdev->desc_nr = choice;
+	} else {
+		if (find_rdev_nr(mddev, rdev->desc_nr))
+			return -EBUSY;
+	}
+			
+	list_add(&rdev->same_set, &mddev->disks);
+	rdev->mddev = mddev;
+	printk(KERN_INFO "md: bind<%s>\n", bdevname(rdev->bdev,b));
+	return 0;
+}
+
+static void unbind_rdev_from_array(mdk_rdev_t * rdev)
+{
+	char b[BDEVNAME_SIZE];
+	if (!rdev->mddev) {
+		MD_BUG();
+		return;
+	}
+	list_del_init(&rdev->same_set);
+	printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
+	rdev->mddev = NULL;
+}
+
+/*
+ * prevent the device from being mounted, repartitioned or
+ * otherwise reused by a RAID array (or any other kernel
+ * subsystem), by bd_claiming the device.
+ */
+static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
+{
+	int err = 0;
+	struct block_device *bdev;
+	char b[BDEVNAME_SIZE];
+
+	bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
+	if (IS_ERR(bdev)) {
+		printk(KERN_ERR "md: could not open %s.\n",
+			__bdevname(dev, b));
+		return PTR_ERR(bdev);
+	}
+	err = bd_claim(bdev, rdev);
+	if (err) {
+		printk(KERN_ERR "md: could not bd_claim %s.\n",
+			bdevname(bdev, b));
+		blkdev_put(bdev);
+		return err;
+	}
+	rdev->bdev = bdev;
+	return err;
+}
+
+static void unlock_rdev(mdk_rdev_t *rdev)
+{
+	struct block_device *bdev = rdev->bdev;
+	rdev->bdev = NULL;
+	if (!bdev)
+		MD_BUG();
+	bd_release(bdev);
+	blkdev_put(bdev);
+}
+
+void md_autodetect_dev(dev_t dev);
+
+static void export_rdev(mdk_rdev_t * rdev)
+{
+	char b[BDEVNAME_SIZE];
+	printk(KERN_INFO "md: export_rdev(%s)\n",
+		bdevname(rdev->bdev,b));
+	if (rdev->mddev)
+		MD_BUG();
+	free_disk_sb(rdev);
+	list_del_init(&rdev->same_set);
+#ifndef MODULE
+	md_autodetect_dev(rdev->bdev->bd_dev);
+#endif
+	unlock_rdev(rdev);
+	kfree(rdev);
+}
+
+static void kick_rdev_from_array(mdk_rdev_t * rdev)
+{
+	unbind_rdev_from_array(rdev);
+	export_rdev(rdev);
+}
+
+static void export_array(mddev_t *mddev)
+{
+	struct list_head *tmp;
+	mdk_rdev_t *rdev;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (!rdev->mddev) {
+			MD_BUG();
+			continue;
+		}
+		kick_rdev_from_array(rdev);
+	}
+	if (!list_empty(&mddev->disks))
+		MD_BUG();
+	mddev->raid_disks = 0;
+	mddev->major_version = 0;
+}
+
+static void print_desc(mdp_disk_t *desc)
+{
+	printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
+		desc->major,desc->minor,desc->raid_disk,desc->state);
+}
+
+static void print_sb(mdp_super_t *sb)
+{
+	int i;
+
+	printk(KERN_INFO 
+		"md:  SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
+		sb->major_version, sb->minor_version, sb->patch_version,
+		sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
+		sb->ctime);
+	printk(KERN_INFO "md:     L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
+		sb->level, sb->size, sb->nr_disks, sb->raid_disks,
+		sb->md_minor, sb->layout, sb->chunk_size);
+	printk(KERN_INFO "md:     UT:%08x ST:%d AD:%d WD:%d"
+		" FD:%d SD:%d CSUM:%08x E:%08lx\n",
+		sb->utime, sb->state, sb->active_disks, sb->working_disks,
+		sb->failed_disks, sb->spare_disks,
+		sb->sb_csum, (unsigned long)sb->events_lo);
+
+	printk(KERN_INFO);
+	for (i = 0; i < MD_SB_DISKS; i++) {
+		mdp_disk_t *desc;
+
+		desc = sb->disks + i;
+		if (desc->number || desc->major || desc->minor ||
+		    desc->raid_disk || (desc->state && (desc->state != 4))) {
+			printk("     D %2d: ", i);
+			print_desc(desc);
+		}
+	}
+	printk(KERN_INFO "md:     THIS: ");
+	print_desc(&sb->this_disk);
+
+}
+
+static void print_rdev(mdk_rdev_t *rdev)
+{
+	char b[BDEVNAME_SIZE];
+	printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
+		bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
+	       	rdev->faulty, rdev->in_sync, rdev->desc_nr);
+	if (rdev->sb_loaded) {
+		printk(KERN_INFO "md: rdev superblock:\n");
+		print_sb((mdp_super_t*)page_address(rdev->sb_page));
+	} else
+		printk(KERN_INFO "md: no rdev superblock!\n");
+}
+
+void md_print_devices(void)
+{
+	struct list_head *tmp, *tmp2;
+	mdk_rdev_t *rdev;
+	mddev_t *mddev;
+	char b[BDEVNAME_SIZE];
+
+	printk("\n");
+	printk("md:	**********************************\n");
+	printk("md:	* <COMPLETE RAID STATE PRINTOUT> *\n");
+	printk("md:	**********************************\n");
+	ITERATE_MDDEV(mddev,tmp) {
+		printk("%s: ", mdname(mddev));
+
+		ITERATE_RDEV(mddev,rdev,tmp2)
+			printk("<%s>", bdevname(rdev->bdev,b));
+		printk("\n");
+
+		ITERATE_RDEV(mddev,rdev,tmp2)
+			print_rdev(rdev);
+	}
+	printk("md:	**********************************\n");
+	printk("\n");
+}
+
+
+static int write_disk_sb(mdk_rdev_t * rdev)
+{
+	char b[BDEVNAME_SIZE];
+	if (!rdev->sb_loaded) {
+		MD_BUG();
+		return 1;
+	}
+	if (rdev->faulty) {
+		MD_BUG();
+		return 1;
+	}
+
+	dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
+		bdevname(rdev->bdev,b),
+	       (unsigned long long)rdev->sb_offset);
+  
+	if (sync_page_io(rdev->bdev, rdev->sb_offset<<1, MD_SB_BYTES, rdev->sb_page, WRITE))
+		return 0;
+
+	printk("md: write_disk_sb failed for device %s\n", 
+		bdevname(rdev->bdev,b));
+	return 1;
+}
+
+static void sync_sbs(mddev_t * mddev)
+{
+	mdk_rdev_t *rdev;
+	struct list_head *tmp;
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		super_types[mddev->major_version].
+			sync_super(mddev, rdev);
+		rdev->sb_loaded = 1;
+	}
+}
+
+static void md_update_sb(mddev_t * mddev)
+{
+	int err, count = 100;
+	struct list_head *tmp;
+	mdk_rdev_t *rdev;
+
+	mddev->sb_dirty = 0;
+repeat:
+	mddev->utime = get_seconds();
+	mddev->events ++;
+
+	if (!mddev->events) {
+		/*
+		 * oops, this 64-bit counter should never wrap.
+		 * Either we are in around ~1 trillion A.C., assuming
+		 * 1 reboot per second, or we have a bug:
+		 */
+		MD_BUG();
+		mddev->events --;
+	}
+	sync_sbs(mddev);
+
+	/*
+	 * do not write anything to disk if using
+	 * nonpersistent superblocks
+	 */
+	if (!mddev->persistent)
+		return;
+
+	dprintk(KERN_INFO 
+		"md: updating %s RAID superblock on device (in sync %d)\n",
+		mdname(mddev),mddev->in_sync);
+
+	err = 0;
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		char b[BDEVNAME_SIZE];
+		dprintk(KERN_INFO "md: ");
+		if (rdev->faulty)
+			dprintk("(skipping faulty ");
+
+		dprintk("%s ", bdevname(rdev->bdev,b));
+		if (!rdev->faulty) {
+			err += write_disk_sb(rdev);
+		} else
+			dprintk(")\n");
+		if (!err && mddev->level == LEVEL_MULTIPATH)
+			/* only need to write one superblock... */
+			break;
+	}
+	if (err) {
+		if (--count) {
+			printk(KERN_ERR "md: errors occurred during superblock"
+				" update, repeating\n");
+			goto repeat;
+		}
+		printk(KERN_ERR \
+			"md: excessive errors occurred during superblock update, exiting\n");
+	}
+}
+
+/*
+ * Import a device. If 'super_format' >= 0, then sanity check the superblock
+ *
+ * mark the device faulty if:
+ *
+ *   - the device is nonexistent (zero size)
+ *   - the device has no valid superblock
+ *
+ * a faulty rdev _never_ has rdev->sb set.
+ */
+static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
+{
+	char b[BDEVNAME_SIZE];
+	int err;
+	mdk_rdev_t *rdev;
+	sector_t size;
+
+	rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
+	if (!rdev) {
+		printk(KERN_ERR "md: could not alloc mem for new device!\n");
+		return ERR_PTR(-ENOMEM);
+	}
+	memset(rdev, 0, sizeof(*rdev));
+
+	if ((err = alloc_disk_sb(rdev)))
+		goto abort_free;
+
+	err = lock_rdev(rdev, newdev);
+	if (err)
+		goto abort_free;
+
+	rdev->desc_nr = -1;
+	rdev->faulty = 0;
+	rdev->in_sync = 0;
+	rdev->data_offset = 0;
+	atomic_set(&rdev->nr_pending, 0);
+
+	size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
+	if (!size) {
+		printk(KERN_WARNING 
+			"md: %s has zero or unknown size, marking faulty!\n",
+			bdevname(rdev->bdev,b));
+		err = -EINVAL;
+		goto abort_free;
+	}
+
+	if (super_format >= 0) {
+		err = super_types[super_format].
+			load_super(rdev, NULL, super_minor);
+		if (err == -EINVAL) {
+			printk(KERN_WARNING 
+				"md: %s has invalid sb, not importing!\n",
+				bdevname(rdev->bdev,b));
+			goto abort_free;
+		}
+		if (err < 0) {
+			printk(KERN_WARNING 
+				"md: could not read %s's sb, not importing!\n",
+				bdevname(rdev->bdev,b));
+			goto abort_free;
+		}
+	}
+	INIT_LIST_HEAD(&rdev->same_set);
+
+	return rdev;
+
+abort_free:
+	if (rdev->sb_page) {
+		if (rdev->bdev)
+			unlock_rdev(rdev);
+		free_disk_sb(rdev);
+	}
+	kfree(rdev);
+	return ERR_PTR(err);
+}
+
+/*
+ * Check a full RAID array for plausibility
+ */
+
+
+static int analyze_sbs(mddev_t * mddev)
+{
+	int i;
+	struct list_head *tmp;
+	mdk_rdev_t *rdev, *freshest;
+	char b[BDEVNAME_SIZE];
+
+	freshest = NULL;
+	ITERATE_RDEV(mddev,rdev,tmp)
+		switch (super_types[mddev->major_version].
+			load_super(rdev, freshest, mddev->minor_version)) {
+		case 1:
+			freshest = rdev;
+			break;
+		case 0:
+			break;
+		default:
+			printk( KERN_ERR \
+				"md: fatal superblock inconsistency in %s"
+				" -- removing from array\n", 
+				bdevname(rdev->bdev,b));
+			kick_rdev_from_array(rdev);
+		}
+
+
+	super_types[mddev->major_version].
+		validate_super(mddev, freshest);
+
+	i = 0;
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev != freshest)
+			if (super_types[mddev->major_version].
+			    validate_super(mddev, rdev)) {
+				printk(KERN_WARNING "md: kicking non-fresh %s"
+					" from array!\n",
+					bdevname(rdev->bdev,b));
+				kick_rdev_from_array(rdev);
+				continue;
+			}
+		if (mddev->level == LEVEL_MULTIPATH) {
+			rdev->desc_nr = i++;
+			rdev->raid_disk = rdev->desc_nr;
+			rdev->in_sync = 1;
+		}
+	}
+
+
+
+	if (mddev->recovery_cp != MaxSector &&
+	    mddev->level >= 1)
+		printk(KERN_ERR "md: %s: raid array is not clean"
+		       " -- starting background reconstruction\n",
+		       mdname(mddev));
+
+	return 0;
+}
+
+int mdp_major = 0;
+
+static struct kobject *md_probe(dev_t dev, int *part, void *data)
+{
+	static DECLARE_MUTEX(disks_sem);
+	mddev_t *mddev = mddev_find(dev);
+	struct gendisk *disk;
+	int partitioned = (MAJOR(dev) != MD_MAJOR);
+	int shift = partitioned ? MdpMinorShift : 0;
+	int unit = MINOR(dev) >> shift;
+
+	if (!mddev)
+		return NULL;
+
+	down(&disks_sem);
+	if (mddev->gendisk) {
+		up(&disks_sem);
+		mddev_put(mddev);
+		return NULL;
+	}
+	disk = alloc_disk(1 << shift);
+	if (!disk) {
+		up(&disks_sem);
+		mddev_put(mddev);
+		return NULL;
+	}
+	disk->major = MAJOR(dev);
+	disk->first_minor = unit << shift;
+	if (partitioned) {
+		sprintf(disk->disk_name, "md_d%d", unit);
+		sprintf(disk->devfs_name, "md/d%d", unit);
+	} else {
+		sprintf(disk->disk_name, "md%d", unit);
+		sprintf(disk->devfs_name, "md/%d", unit);
+	}
+	disk->fops = &md_fops;
+	disk->private_data = mddev;
+	disk->queue = mddev->queue;
+	add_disk(disk);
+	mddev->gendisk = disk;
+	up(&disks_sem);
+	return NULL;
+}
+
+void md_wakeup_thread(mdk_thread_t *thread);
+
+static void md_safemode_timeout(unsigned long data)
+{
+	mddev_t *mddev = (mddev_t *) data;
+
+	mddev->safemode = 1;
+	md_wakeup_thread(mddev->thread);
+}
+
+
+static int do_md_run(mddev_t * mddev)
+{
+	int pnum, err;
+	int chunk_size;
+	struct list_head *tmp;
+	mdk_rdev_t *rdev;
+	struct gendisk *disk;
+	char b[BDEVNAME_SIZE];
+
+	if (list_empty(&mddev->disks)) {
+		MD_BUG();
+		return -EINVAL;
+	}
+
+	if (mddev->pers)
+		return -EBUSY;
+
+	/*
+	 * Analyze all RAID superblock(s)
+	 */
+	if (!mddev->raid_disks && analyze_sbs(mddev)) {
+		MD_BUG();
+		return -EINVAL;
+	}
+
+	chunk_size = mddev->chunk_size;
+	pnum = level_to_pers(mddev->level);
+
+	if ((pnum != MULTIPATH) && (pnum != RAID1)) {
+		if (!chunk_size) {
+			/*
+			 * 'default chunksize' in the old md code used to
+			 * be PAGE_SIZE, baaad.
+			 * we abort here to be on the safe side. We don't
+			 * want to continue the bad practice.
+			 */
+			printk(KERN_ERR 
+				"no chunksize specified, see 'man raidtab'\n");
+			return -EINVAL;
+		}
+		if (chunk_size > MAX_CHUNK_SIZE) {
+			printk(KERN_ERR "too big chunk_size: %d > %d\n",
+				chunk_size, MAX_CHUNK_SIZE);
+			return -EINVAL;
+		}
+		/*
+		 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
+		 */
+		if ( (1 << ffz(~chunk_size)) != chunk_size) {
+			MD_BUG();
+			return -EINVAL;
+		}
+		if (chunk_size < PAGE_SIZE) {
+			printk(KERN_ERR "too small chunk_size: %d < %ld\n",
+				chunk_size, PAGE_SIZE);
+			return -EINVAL;
+		}
+
+		/* devices must have minimum size of one chunk */
+		ITERATE_RDEV(mddev,rdev,tmp) {
+			if (rdev->faulty)
+				continue;
+			if (rdev->size < chunk_size / 1024) {
+				printk(KERN_WARNING
+					"md: Dev %s smaller than chunk_size:"
+					" %lluk < %dk\n",
+					bdevname(rdev->bdev,b),
+					(unsigned long long)rdev->size,
+					chunk_size / 1024);
+				return -EINVAL;
+			}
+		}
+	}
+
+	if (pnum >= MAX_PERSONALITY) {
+		MD_BUG();
+		return -EINVAL;
+	}
+
+#ifdef CONFIG_KMOD
+	if (!pers[pnum])
+	{
+		request_module("md-personality-%d", pnum);
+	}
+#endif
+
+	/*
+	 * Drop all container device buffers, from now on
+	 * the only valid external interface is through the md
+	 * device.
+	 * Also find largest hardsector size
+	 */
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		if (rdev->faulty)
+			continue;
+		sync_blockdev(rdev->bdev);
+		invalidate_bdev(rdev->bdev, 0);
+	}
+
+	md_probe(mddev->unit, NULL, NULL);
+	disk = mddev->gendisk;
+	if (!disk)
+		return -ENOMEM;
+
+	spin_lock(&pers_lock);
+	if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
+		spin_unlock(&pers_lock);
+		printk(KERN_WARNING "md: personality %d is not loaded!\n",
+		       pnum);
+		return -EINVAL;
+	}
+
+	mddev->pers = pers[pnum];
+	spin_unlock(&pers_lock);
+
+	mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
+
+	err = mddev->pers->run(mddev);
+	if (err) {
+		printk(KERN_ERR "md: pers->run() failed ...\n");
+		module_put(mddev->pers->owner);
+		mddev->pers = NULL;
+		return -EINVAL;
+	}
+ 	atomic_set(&mddev->writes_pending,0);
+	mddev->safemode = 0;
+	mddev->safemode_timer.function = md_safemode_timeout;
+	mddev->safemode_timer.data = (unsigned long) mddev;
+	mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
+	mddev->in_sync = 1;
+	
+	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+	
+	if (mddev->sb_dirty)
+		md_update_sb(mddev);
+
+	set_capacity(disk, mddev->array_size<<1);
+
+	/* If we call blk_queue_make_request here, it will
+	 * re-initialise max_sectors etc which may have been
+	 * refined inside -> run.  So just set the bits we need to set.
+	 * Most initialisation happended when we called
+	 * blk_queue_make_request(..., md_fail_request)
+	 * earlier.
+	 */
+	mddev->queue->queuedata = mddev;
+	mddev->queue->make_request_fn = mddev->pers->make_request;
+
+	mddev->changed = 1;
+	return 0;
+}
+
+static int restart_array(mddev_t *mddev)
+{
+	struct gendisk *disk = mddev->gendisk;
+	int err;
+
+	/*
+	 * Complain if it has no devices
+	 */
+	err = -ENXIO;
+	if (list_empty(&mddev->disks))
+		goto out;
+
+	if (mddev->pers) {
+		err = -EBUSY;
+		if (!mddev->ro)
+			goto out;
+
+		mddev->safemode = 0;
+		mddev->ro = 0;
+		set_disk_ro(disk, 0);
+
+		printk(KERN_INFO "md: %s switched to read-write mode.\n",
+			mdname(mddev));
+		/*
+		 * Kick recovery or resync if necessary
+		 */
+		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+		md_wakeup_thread(mddev->thread);
+		err = 0;
+	} else {
+		printk(KERN_ERR "md: %s has no personality assigned.\n",
+			mdname(mddev));
+		err = -EINVAL;
+	}
+
+out:
+	return err;
+}
+
+static int do_md_stop(mddev_t * mddev, int ro)
+{
+	int err = 0;
+	struct gendisk *disk = mddev->gendisk;
+
+	if (mddev->pers) {
+		if (atomic_read(&mddev->active)>2) {
+			printk("md: %s still in use.\n",mdname(mddev));
+			return -EBUSY;
+		}
+
+		if (mddev->sync_thread) {
+			set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+			md_unregister_thread(mddev->sync_thread);
+			mddev->sync_thread = NULL;
+		}
+
+		del_timer_sync(&mddev->safemode_timer);
+
+		invalidate_partition(disk, 0);
+
+		if (ro) {
+			err  = -ENXIO;
+			if (mddev->ro)
+				goto out;
+			mddev->ro = 1;
+		} else {
+			if (mddev->ro)
+				set_disk_ro(disk, 0);
+			blk_queue_make_request(mddev->queue, md_fail_request);
+			mddev->pers->stop(mddev);
+			module_put(mddev->pers->owner);
+			mddev->pers = NULL;
+			if (mddev->ro)
+				mddev->ro = 0;
+		}
+		if (!mddev->in_sync) {
+			/* mark array as shutdown cleanly */
+			mddev->in_sync = 1;
+			md_update_sb(mddev);
+		}
+		if (ro)
+			set_disk_ro(disk, 1);
+	}
+	/*
+	 * Free resources if final stop
+	 */
+	if (!ro) {
+		struct gendisk *disk;
+		printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
+
+		export_array(mddev);
+
+		mddev->array_size = 0;
+		disk = mddev->gendisk;
+		if (disk)
+			set_capacity(disk, 0);
+		mddev->changed = 1;
+	} else
+		printk(KERN_INFO "md: %s switched to read-only mode.\n",
+			mdname(mddev));
+	err = 0;
+out:
+	return err;
+}
+
+static void autorun_array(mddev_t *mddev)
+{
+	mdk_rdev_t *rdev;
+	struct list_head *tmp;
+	int err;
+
+	if (list_empty(&mddev->disks)) {
+		MD_BUG();
+		return;
+	}
+
+	printk(KERN_INFO "md: running: ");
+
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		char b[BDEVNAME_SIZE];
+		printk("<%s>", bdevname(rdev->bdev,b));
+	}
+	printk("\n");
+
+	err = do_md_run (mddev);
+	if (err) {
+		printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
+		do_md_stop (mddev, 0);
+	}
+}
+
+/*
+ * lets try to run arrays based on all disks that have arrived
+ * until now. (those are in pending_raid_disks)
+ *
+ * the method: pick the first pending disk, collect all disks with
+ * the same UUID, remove all from the pending list and put them into
+ * the 'same_array' list. Then order this list based on superblock
+ * update time (freshest comes first), kick out 'old' disks and
+ * compare superblocks. If everything's fine then run it.
+ *
+ * If "unit" is allocated, then bump its reference count
+ */
+static void autorun_devices(int part)
+{
+	struct list_head candidates;
+	struct list_head *tmp;
+	mdk_rdev_t *rdev0, *rdev;
+	mddev_t *mddev;
+	char b[BDEVNAME_SIZE];
+
+	printk(KERN_INFO "md: autorun ...\n");
+	while (!list_empty(&pending_raid_disks)) {
+		dev_t dev;
+		rdev0 = list_entry(pending_raid_disks.next,
+					 mdk_rdev_t, same_set);
+
+		printk(KERN_INFO "md: considering %s ...\n",
+			bdevname(rdev0->bdev,b));
+		INIT_LIST_HEAD(&candidates);
+		ITERATE_RDEV_PENDING(rdev,tmp)
+			if (super_90_load(rdev, rdev0, 0) >= 0) {
+				printk(KERN_INFO "md:  adding %s ...\n",
+					bdevname(rdev->bdev,b));
+				list_move(&rdev->same_set, &candidates);
+			}
+		/*
+		 * now we have a set of devices, with all of them having
+		 * mostly sane superblocks. It's time to allocate the
+		 * mddev.
+		 */
+		if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
+			printk(KERN_INFO "md: unit number in %s is bad: %d\n",
+			       bdevname(rdev0->bdev, b), rdev0->preferred_minor);
+			break;
+		}
+		if (part)
+			dev = MKDEV(mdp_major,
+				    rdev0->preferred_minor << MdpMinorShift);
+		else
+			dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
+
+		md_probe(dev, NULL, NULL);
+		mddev = mddev_find(dev);
+		if (!mddev) {
+			printk(KERN_ERR 
+				"md: cannot allocate memory for md drive.\n");
+			break;
+		}
+		if (mddev_lock(mddev)) 
+			printk(KERN_WARNING "md: %s locked, cannot run\n",
+			       mdname(mddev));
+		else if (mddev->raid_disks || mddev->major_version
+			 || !list_empty(&mddev->disks)) {
+			printk(KERN_WARNING 
+				"md: %s already running, cannot run %s\n",
+				mdname(mddev), bdevname(rdev0->bdev,b));
+			mddev_unlock(mddev);
+		} else {
+			printk(KERN_INFO "md: created %s\n", mdname(mddev));
+			ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
+				list_del_init(&rdev->same_set);
+				if (bind_rdev_to_array(rdev, mddev))
+					export_rdev(rdev);
+			}
+			autorun_array(mddev);
+			mddev_unlock(mddev);
+		}
+		/* on success, candidates will be empty, on error
+		 * it won't...
+		 */
+		ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
+			export_rdev(rdev);
+		mddev_put(mddev);
+	}
+	printk(KERN_INFO "md: ... autorun DONE.\n");
+}
+
+/*
+ * import RAID devices based on one partition
+ * if possible, the array gets run as well.
+ */
+
+static int autostart_array(dev_t startdev)
+{
+	char b[BDEVNAME_SIZE];
+	int err = -EINVAL, i;
+	mdp_super_t *sb = NULL;
+	mdk_rdev_t *start_rdev = NULL, *rdev;
+
+	start_rdev = md_import_device(startdev, 0, 0);
+	if (IS_ERR(start_rdev))
+		return err;
+
+
+	/* NOTE: this can only work for 0.90.0 superblocks */
+	sb = (mdp_super_t*)page_address(start_rdev->sb_page);
+	if (sb->major_version != 0 ||
+	    sb->minor_version != 90 ) {
+		printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
+		export_rdev(start_rdev);
+		return err;
+	}
+
+	if (start_rdev->faulty) {
+		printk(KERN_WARNING 
+			"md: can not autostart based on faulty %s!\n",
+			bdevname(start_rdev->bdev,b));
+		export_rdev(start_rdev);
+		return err;
+	}
+	list_add(&start_rdev->same_set, &pending_raid_disks);
+
+	for (i = 0; i < MD_SB_DISKS; i++) {
+		mdp_disk_t *desc = sb->disks + i;
+		dev_t dev = MKDEV(desc->major, desc->minor);
+
+		if (!dev)
+			continue;
+		if (dev == startdev)
+			continue;
+		if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
+			continue;
+		rdev = md_import_device(dev, 0, 0);
+		if (IS_ERR(rdev))
+			continue;
+
+		list_add(&rdev->same_set, &pending_raid_disks);
+	}
+
+	/*
+	 * possibly return codes
+	 */
+	autorun_devices(0);
+	return 0;
+
+}
+
+
+static int get_version(void __user * arg)
+{
+	mdu_version_t ver;
+
+	ver.major = MD_MAJOR_VERSION;
+	ver.minor = MD_MINOR_VERSION;
+	ver.patchlevel = MD_PATCHLEVEL_VERSION;
+
+	if (copy_to_user(arg, &ver, sizeof(ver)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int get_array_info(mddev_t * mddev, void __user * arg)
+{
+	mdu_array_info_t info;
+	int nr,working,active,failed,spare;
+	mdk_rdev_t *rdev;
+	struct list_head *tmp;
+
+	nr=working=active=failed=spare=0;
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		nr++;
+		if (rdev->faulty)
+			failed++;
+		else {
+			working++;
+			if (rdev->in_sync)
+				active++;	
+			else
+				spare++;
+		}
+	}
+
+	info.major_version = mddev->major_version;
+	info.minor_version = mddev->minor_version;
+	info.patch_version = MD_PATCHLEVEL_VERSION;
+	info.ctime         = mddev->ctime;
+	info.level         = mddev->level;
+	info.size          = mddev->size;
+	info.nr_disks      = nr;
+	info.raid_disks    = mddev->raid_disks;
+	info.md_minor      = mddev->md_minor;
+	info.not_persistent= !mddev->persistent;
+
+	info.utime         = mddev->utime;
+	info.state         = 0;
+	if (mddev->in_sync)
+		info.state = (1<<MD_SB_CLEAN);
+	info.active_disks  = active;
+	info.working_disks = working;
+	info.failed_disks  = failed;
+	info.spare_disks   = spare;
+
+	info.layout        = mddev->layout;
+	info.chunk_size    = mddev->chunk_size;
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int get_disk_info(mddev_t * mddev, void __user * arg)
+{
+	mdu_disk_info_t info;
+	unsigned int nr;
+	mdk_rdev_t *rdev;
+
+	if (copy_from_user(&info, arg, sizeof(info)))
+		return -EFAULT;
+
+	nr = info.number;
+
+	rdev = find_rdev_nr(mddev, nr);
+	if (rdev) {
+		info.major = MAJOR(rdev->bdev->bd_dev);
+		info.minor = MINOR(rdev->bdev->bd_dev);
+		info.raid_disk = rdev->raid_disk;
+		info.state = 0;
+		if (rdev->faulty)
+			info.state |= (1<<MD_DISK_FAULTY);
+		else if (rdev->in_sync) {
+			info.state |= (1<<MD_DISK_ACTIVE);
+			info.state |= (1<<MD_DISK_SYNC);
+		}
+	} else {
+		info.major = info.minor = 0;
+		info.raid_disk = -1;
+		info.state = (1<<MD_DISK_REMOVED);
+	}
+
+	if (copy_to_user(arg, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
+{
+	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
+	mdk_rdev_t *rdev;
+	dev_t dev = MKDEV(info->major,info->minor);
+
+	if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
+		return -EOVERFLOW;
+
+	if (!mddev->raid_disks) {
+		int err;
+		/* expecting a device which has a superblock */
+		rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
+		if (IS_ERR(rdev)) {
+			printk(KERN_WARNING 
+				"md: md_import_device returned %ld\n",
+				PTR_ERR(rdev));
+			return PTR_ERR(rdev);
+		}
+		if (!list_empty(&mddev->disks)) {
+			mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
+							mdk_rdev_t, same_set);
+			int err = super_types[mddev->major_version]
+				.load_super(rdev, rdev0, mddev->minor_version);
+			if (err < 0) {
+				printk(KERN_WARNING 
+					"md: %s has different UUID to %s\n",
+					bdevname(rdev->bdev,b), 
+					bdevname(rdev0->bdev,b2));
+				export_rdev(rdev);
+				return -EINVAL;
+			}
+		}
+		err = bind_rdev_to_array(rdev, mddev);
+		if (err)
+			export_rdev(rdev);
+		return err;
+	}
+
+	/*
+	 * add_new_disk can be used once the array is assembled
+	 * to add "hot spares".  They must already have a superblock
+	 * written
+	 */
+	if (mddev->pers) {
+		int err;
+		if (!mddev->pers->hot_add_disk) {
+			printk(KERN_WARNING 
+				"%s: personality does not support diskops!\n",
+			       mdname(mddev));
+			return -EINVAL;
+		}
+		rdev = md_import_device(dev, mddev->major_version,
+					mddev->minor_version);
+		if (IS_ERR(rdev)) {
+			printk(KERN_WARNING 
+				"md: md_import_device returned %ld\n",
+				PTR_ERR(rdev));
+			return PTR_ERR(rdev);
+		}
+		rdev->in_sync = 0; /* just to be sure */
+		rdev->raid_disk = -1;
+		err = bind_rdev_to_array(rdev, mddev);
+		if (err)
+			export_rdev(rdev);
+		if (mddev->thread)
+			md_wakeup_thread(mddev->thread);
+		return err;
+	}
+
+	/* otherwise, add_new_disk is only allowed
+	 * for major_version==0 superblocks
+	 */
+	if (mddev->major_version != 0) {
+		printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
+		       mdname(mddev));
+		return -EINVAL;
+	}
+
+	if (!(info->state & (1<<MD_DISK_FAULTY))) {
+		int err;
+		rdev = md_import_device (dev, -1, 0);
+		if (IS_ERR(rdev)) {
+			printk(KERN_WARNING 
+				"md: error, md_import_device() returned %ld\n",
+				PTR_ERR(rdev));
+			return PTR_ERR(rdev);
+		}
+		rdev->desc_nr = info->number;
+		if (info->raid_disk < mddev->raid_disks)
+			rdev->raid_disk = info->raid_disk;
+		else
+			rdev->raid_disk = -1;
+
+		rdev->faulty = 0;
+		if (rdev->raid_disk < mddev->raid_disks)
+			rdev->in_sync = (info->state & (1<<MD_DISK_SYNC));
+		else
+			rdev->in_sync = 0;
+
+		err = bind_rdev_to_array(rdev, mddev);
+		if (err) {
+			export_rdev(rdev);
+			return err;
+		}
+
+		if (!mddev->persistent) {
+			printk(KERN_INFO "md: nonpersistent superblock ...\n");
+			rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
+		} else 
+			rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
+		rdev->size = calc_dev_size(rdev, mddev->chunk_size);
+
+		if (!mddev->size || (mddev->size > rdev->size))
+			mddev->size = rdev->size;
+	}
+
+	return 0;
+}
+
+static int hot_remove_disk(mddev_t * mddev, dev_t dev)
+{
+	char b[BDEVNAME_SIZE];
+	mdk_rdev_t *rdev;
+
+	if (!mddev->pers)
+		return -ENODEV;
+
+	rdev = find_rdev(mddev, dev);
+	if (!rdev)
+		return -ENXIO;
+
+	if (rdev->raid_disk >= 0)
+		goto busy;
+
+	kick_rdev_from_array(rdev);
+	md_update_sb(mddev);
+
+	return 0;
+busy:
+	printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
+		bdevname(rdev->bdev,b), mdname(mddev));
+	return -EBUSY;
+}
+
+static int hot_add_disk(mddev_t * mddev, dev_t dev)
+{
+	char b[BDEVNAME_SIZE];
+	int err;
+	unsigned int size;
+	mdk_rdev_t *rdev;
+
+	if (!mddev->pers)
+		return -ENODEV;
+
+	if (mddev->major_version != 0) {
+		printk(KERN_WARNING "%s: HOT_ADD may only be used with"
+			" version-0 superblocks.\n",
+			mdname(mddev));
+		return -EINVAL;
+	}
+	if (!mddev->pers->hot_add_disk) {
+		printk(KERN_WARNING 
+			"%s: personality does not support diskops!\n",
+			mdname(mddev));
+		return -EINVAL;
+	}
+
+	rdev = md_import_device (dev, -1, 0);
+	if (IS_ERR(rdev)) {
+		printk(KERN_WARNING 
+			"md: error, md_import_device() returned %ld\n",
+			PTR_ERR(rdev));
+		return -EINVAL;
+	}
+
+	if (mddev->persistent)
+		rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
+	else
+		rdev->sb_offset =
+			rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
+
+	size = calc_dev_size(rdev, mddev->chunk_size);
+	rdev->size = size;
+
+	if (size < mddev->size) {
+		printk(KERN_WARNING 
+			"%s: disk size %llu blocks < array size %llu\n",
+			mdname(mddev), (unsigned long long)size,
+			(unsigned long long)mddev->size);
+		err = -ENOSPC;
+		goto abort_export;
+	}
+
+	if (rdev->faulty) {
+		printk(KERN_WARNING 
+			"md: can not hot-add faulty %s disk to %s!\n",
+			bdevname(rdev->bdev,b), mdname(mddev));
+		err = -EINVAL;
+		goto abort_export;
+	}
+	rdev->in_sync = 0;
+	rdev->desc_nr = -1;
+	bind_rdev_to_array(rdev, mddev);
+
+	/*
+	 * The rest should better be atomic, we can have disk failures
+	 * noticed in interrupt contexts ...
+	 */
+
+	if (rdev->desc_nr == mddev->max_disks) {
+		printk(KERN_WARNING "%s: can not hot-add to full array!\n",
+			mdname(mddev));
+		err = -EBUSY;
+		goto abort_unbind_export;
+	}
+
+	rdev->raid_disk = -1;
+
+	md_update_sb(mddev);
+
+	/*
+	 * Kick recovery, maybe this spare has to be added to the
+	 * array immediately.
+	 */
+	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+	md_wakeup_thread(mddev->thread);
+
+	return 0;
+
+abort_unbind_export:
+	unbind_rdev_from_array(rdev);
+
+abort_export:
+	export_rdev(rdev);
+	return err;
+}
+
+/*
+ * set_array_info is used two different ways
+ * The original usage is when creating a new array.
+ * In this usage, raid_disks is > 0 and it together with
+ *  level, size, not_persistent,layout,chunksize determine the
+ *  shape of the array.
+ *  This will always create an array with a type-0.90.0 superblock.
+ * The newer usage is when assembling an array.
+ *  In this case raid_disks will be 0, and the major_version field is
+ *  use to determine which style super-blocks are to be found on the devices.
+ *  The minor and patch _version numbers are also kept incase the
+ *  super_block handler wishes to interpret them.
+ */
+static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
+{
+
+	if (info->raid_disks == 0) {
+		/* just setting version number for superblock loading */
+		if (info->major_version < 0 ||
+		    info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
+		    super_types[info->major_version].name == NULL) {
+			/* maybe try to auto-load a module? */
+			printk(KERN_INFO 
+				"md: superblock version %d not known\n",
+				info->major_version);
+			return -EINVAL;
+		}
+		mddev->major_version = info->major_version;
+		mddev->minor_version = info->minor_version;
+		mddev->patch_version = info->patch_version;
+		return 0;
+	}
+	mddev->major_version = MD_MAJOR_VERSION;
+	mddev->minor_version = MD_MINOR_VERSION;
+	mddev->patch_version = MD_PATCHLEVEL_VERSION;
+	mddev->ctime         = get_seconds();
+
+	mddev->level         = info->level;
+	mddev->size          = info->size;
+	mddev->raid_disks    = info->raid_disks;
+	/* don't set md_minor, it is determined by which /dev/md* was
+	 * openned
+	 */
+	if (info->state & (1<<MD_SB_CLEAN))
+		mddev->recovery_cp = MaxSector;
+	else
+		mddev->recovery_cp = 0;
+	mddev->persistent    = ! info->not_persistent;
+
+	mddev->layout        = info->layout;
+	mddev->chunk_size    = info->chunk_size;
+
+	mddev->max_disks     = MD_SB_DISKS;
+
+	mddev->sb_dirty      = 1;
+
+	/*
+	 * Generate a 128 bit UUID
+	 */
+	get_random_bytes(mddev->uuid, 16);
+
+	return 0;
+}
+
+/*
+ * update_array_info is used to change the configuration of an
+ * on-line array.
+ * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
+ * fields in the info are checked against the array.
+ * Any differences that cannot be handled will cause an error.
+ * Normally, only one change can be managed at a time.
+ */
+static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
+{
+	int rv = 0;
+	int cnt = 0;
+
+	if (mddev->major_version != info->major_version ||
+	    mddev->minor_version != info->minor_version ||
+/*	    mddev->patch_version != info->patch_version || */
+	    mddev->ctime         != info->ctime         ||
+	    mddev->level         != info->level         ||
+/*	    mddev->layout        != info->layout        || */
+	    !mddev->persistent	 != info->not_persistent||
+	    mddev->chunk_size    != info->chunk_size    )
+		return -EINVAL;
+	/* Check there is only one change */
+	if (mddev->size != info->size) cnt++;
+	if (mddev->raid_disks != info->raid_disks) cnt++;
+	if (mddev->layout != info->layout) cnt++;
+	if (cnt == 0) return 0;
+	if (cnt > 1) return -EINVAL;
+
+	if (mddev->layout != info->layout) {
+		/* Change layout
+		 * we don't need to do anything at the md level, the
+		 * personality will take care of it all.
+		 */
+		if (mddev->pers->reconfig == NULL)
+			return -EINVAL;
+		else
+			return mddev->pers->reconfig(mddev, info->layout, -1);
+	}
+	if (mddev->size != info->size) {
+		mdk_rdev_t * rdev;
+		struct list_head *tmp;
+		if (mddev->pers->resize == NULL)
+			return -EINVAL;
+		/* The "size" is the amount of each device that is used.
+		 * This can only make sense for arrays with redundancy.
+		 * linear and raid0 always use whatever space is available
+		 * We can only consider changing the size if no resync
+		 * or reconstruction is happening, and if the new size
+		 * is acceptable. It must fit before the sb_offset or,
+		 * if that is <data_offset, it must fit before the
+		 * size of each device.
+		 * If size is zero, we find the largest size that fits.
+		 */
+		if (mddev->sync_thread)
+			return -EBUSY;
+		ITERATE_RDEV(mddev,rdev,tmp) {
+			sector_t avail;
+			int fit = (info->size == 0);
+			if (rdev->sb_offset > rdev->data_offset)
+				avail = (rdev->sb_offset*2) - rdev->data_offset;
+			else
+				avail = get_capacity(rdev->bdev->bd_disk)
+					- rdev->data_offset;
+			if (fit && (info->size == 0 || info->size > avail/2))
+				info->size = avail/2;
+			if (avail < ((sector_t)info->size << 1))
+				return -ENOSPC;
+		}
+		rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
+		if (!rv) {
+			struct block_device *bdev;
+
+			bdev = bdget_disk(mddev->gendisk, 0);
+			if (bdev) {
+				down(&bdev->bd_inode->i_sem);
+				i_size_write(bdev->bd_inode, mddev->array_size << 10);
+				up(&bdev->bd_inode->i_sem);
+				bdput(bdev);
+			}
+		}
+	}
+	if (mddev->raid_disks    != info->raid_disks) {
+		/* change the number of raid disks */
+		if (mddev->pers->reshape == NULL)
+			return -EINVAL;
+		if (info->raid_disks <= 0 ||
+		    info->raid_disks >= mddev->max_disks)
+			return -EINVAL;
+		if (mddev->sync_thread)
+			return -EBUSY;
+		rv = mddev->pers->reshape(mddev, info->raid_disks);
+		if (!rv) {
+			struct block_device *bdev;
+
+			bdev = bdget_disk(mddev->gendisk, 0);
+			if (bdev) {
+				down(&bdev->bd_inode->i_sem);
+				i_size_write(bdev->bd_inode, mddev->array_size << 10);
+				up(&bdev->bd_inode->i_sem);
+				bdput(bdev);
+			}
+		}
+	}
+	md_update_sb(mddev);
+	return rv;
+}
+
+static int set_disk_faulty(mddev_t *mddev, dev_t dev)
+{
+	mdk_rdev_t *rdev;
+
+	if (mddev->pers == NULL)
+		return -ENODEV;
+
+	rdev = find_rdev(mddev, dev);
+	if (!rdev)
+		return -ENODEV;
+
+	md_error(mddev, rdev);
+	return 0;
+}
+
+static int md_ioctl(struct inode *inode, struct file *file,
+			unsigned int cmd, unsigned long arg)
+{
+	int err = 0;
+	void __user *argp = (void __user *)arg;
+	struct hd_geometry __user *loc = argp;
+	mddev_t *mddev = NULL;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	/*
+	 * Commands dealing with the RAID driver but not any
+	 * particular array:
+	 */
+	switch (cmd)
+	{
+		case RAID_VERSION:
+			err = get_version(argp);
+			goto done;
+
+		case PRINT_RAID_DEBUG:
+			err = 0;
+			md_print_devices();
+			goto done;
+
+#ifndef MODULE
+		case RAID_AUTORUN:
+			err = 0;
+			autostart_arrays(arg);
+			goto done;
+#endif
+		default:;
+	}
+
+	/*
+	 * Commands creating/starting a new array:
+	 */
+
+	mddev = inode->i_bdev->bd_disk->private_data;
+
+	if (!mddev) {
+		BUG();
+		goto abort;
+	}
+
+
+	if (cmd == START_ARRAY) {
+		/* START_ARRAY doesn't need to lock the array as autostart_array
+		 * does the locking, and it could even be a different array
+		 */
+		static int cnt = 3;
+		if (cnt > 0 ) {
+			printk(KERN_WARNING
+			       "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
+			       "This will not be supported beyond 2.6\n",
+			       current->comm, current->pid);
+			cnt--;
+		}
+		err = autostart_array(new_decode_dev(arg));
+		if (err) {
+			printk(KERN_WARNING "md: autostart failed!\n");
+			goto abort;
+		}
+		goto done;
+	}
+
+	err = mddev_lock(mddev);
+	if (err) {
+		printk(KERN_INFO 
+			"md: ioctl lock interrupted, reason %d, cmd %d\n",
+			err, cmd);
+		goto abort;
+	}
+
+	switch (cmd)
+	{
+		case SET_ARRAY_INFO:
+			{
+				mdu_array_info_t info;
+				if (!arg)
+					memset(&info, 0, sizeof(info));
+				else if (copy_from_user(&info, argp, sizeof(info))) {
+					err = -EFAULT;
+					goto abort_unlock;
+				}
+				if (mddev->pers) {
+					err = update_array_info(mddev, &info);
+					if (err) {
+						printk(KERN_WARNING "md: couldn't update"
+						       " array info. %d\n", err);
+						goto abort_unlock;
+					}
+					goto done_unlock;
+				}
+				if (!list_empty(&mddev->disks)) {
+					printk(KERN_WARNING
+					       "md: array %s already has disks!\n",
+					       mdname(mddev));
+					err = -EBUSY;
+					goto abort_unlock;
+				}
+				if (mddev->raid_disks) {
+					printk(KERN_WARNING
+					       "md: array %s already initialised!\n",
+					       mdname(mddev));
+					err = -EBUSY;
+					goto abort_unlock;
+				}
+				err = set_array_info(mddev, &info);
+				if (err) {
+					printk(KERN_WARNING "md: couldn't set"
+					       " array info. %d\n", err);
+					goto abort_unlock;
+				}
+			}
+			goto done_unlock;
+
+		default:;
+	}
+
+	/*
+	 * Commands querying/configuring an existing array:
+	 */
+	/* if we are initialised yet, only ADD_NEW_DISK or STOP_ARRAY is allowed */
+	if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY && cmd != RUN_ARRAY) {
+		err = -ENODEV;
+		goto abort_unlock;
+	}
+
+	/*
+	 * Commands even a read-only array can execute:
+	 */
+	switch (cmd)
+	{
+		case GET_ARRAY_INFO:
+			err = get_array_info(mddev, argp);
+			goto done_unlock;
+
+		case GET_DISK_INFO:
+			err = get_disk_info(mddev, argp);
+			goto done_unlock;
+
+		case RESTART_ARRAY_RW:
+			err = restart_array(mddev);
+			goto done_unlock;
+
+		case STOP_ARRAY:
+			err = do_md_stop (mddev, 0);
+			goto done_unlock;
+
+		case STOP_ARRAY_RO:
+			err = do_md_stop (mddev, 1);
+			goto done_unlock;
+
+	/*
+	 * We have a problem here : there is no easy way to give a CHS
+	 * virtual geometry. We currently pretend that we have a 2 heads
+	 * 4 sectors (with a BIG number of cylinders...). This drives
+	 * dosfs just mad... ;-)
+	 */
+		case HDIO_GETGEO:
+			if (!loc) {
+				err = -EINVAL;
+				goto abort_unlock;
+			}
+			err = put_user (2, (char __user *) &loc->heads);
+			if (err)
+				goto abort_unlock;
+			err = put_user (4, (char __user *) &loc->sectors);
+			if (err)
+				goto abort_unlock;
+			err = put_user(get_capacity(mddev->gendisk)/8,
+					(short __user *) &loc->cylinders);
+			if (err)
+				goto abort_unlock;
+			err = put_user (get_start_sect(inode->i_bdev),
+						(long __user *) &loc->start);
+			goto done_unlock;
+	}
+
+	/*
+	 * The remaining ioctls are changing the state of the
+	 * superblock, so we do not allow read-only arrays
+	 * here:
+	 */
+	if (mddev->ro) {
+		err = -EROFS;
+		goto abort_unlock;
+	}
+
+	switch (cmd)
+	{
+		case ADD_NEW_DISK:
+		{
+			mdu_disk_info_t info;
+			if (copy_from_user(&info, argp, sizeof(info)))
+				err = -EFAULT;
+			else
+				err = add_new_disk(mddev, &info);
+			goto done_unlock;
+		}
+
+		case HOT_REMOVE_DISK:
+			err = hot_remove_disk(mddev, new_decode_dev(arg));
+			goto done_unlock;
+
+		case HOT_ADD_DISK:
+			err = hot_add_disk(mddev, new_decode_dev(arg));
+			goto done_unlock;
+
+		case SET_DISK_FAULTY:
+			err = set_disk_faulty(mddev, new_decode_dev(arg));
+			goto done_unlock;
+
+		case RUN_ARRAY:
+			err = do_md_run (mddev);
+			goto done_unlock;
+
+		default:
+			if (_IOC_TYPE(cmd) == MD_MAJOR)
+				printk(KERN_WARNING "md: %s(pid %d) used"
+					" obsolete MD ioctl, upgrade your"
+					" software to use new ictls.\n",
+					current->comm, current->pid);
+			err = -EINVAL;
+			goto abort_unlock;
+	}
+
+done_unlock:
+abort_unlock:
+	mddev_unlock(mddev);
+
+	return err;
+done:
+	if (err)
+		MD_BUG();
+abort:
+	return err;
+}
+
+static int md_open(struct inode *inode, struct file *file)
+{
+	/*
+	 * Succeed if we can lock the mddev, which confirms that
+	 * it isn't being stopped right now.
+	 */
+	mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
+	int err;
+
+	if ((err = mddev_lock(mddev)))
+		goto out;
+
+	err = 0;
+	mddev_get(mddev);
+	mddev_unlock(mddev);
+
+	check_disk_change(inode->i_bdev);
+ out:
+	return err;
+}
+
+static int md_release(struct inode *inode, struct file * file)
+{
+ 	mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
+
+	if (!mddev)
+		BUG();
+	mddev_put(mddev);
+
+	return 0;
+}
+
+static int md_media_changed(struct gendisk *disk)
+{
+	mddev_t *mddev = disk->private_data;
+
+	return mddev->changed;
+}
+
+static int md_revalidate(struct gendisk *disk)
+{
+	mddev_t *mddev = disk->private_data;
+
+	mddev->changed = 0;
+	return 0;
+}
+static struct block_device_operations md_fops =
+{
+	.owner		= THIS_MODULE,
+	.open		= md_open,
+	.release	= md_release,
+	.ioctl		= md_ioctl,
+	.media_changed	= md_media_changed,
+	.revalidate_disk= md_revalidate,
+};
+
+int md_thread(void * arg)
+{
+	mdk_thread_t *thread = arg;
+
+	lock_kernel();
+
+	/*
+	 * Detach thread
+	 */
+
+	daemonize(thread->name, mdname(thread->mddev));
+
+	current->exit_signal = SIGCHLD;
+	allow_signal(SIGKILL);
+	thread->tsk = current;
+
+	/*
+	 * md_thread is a 'system-thread', it's priority should be very
+	 * high. We avoid resource deadlocks individually in each
+	 * raid personality. (RAID5 does preallocation) We also use RR and
+	 * the very same RT priority as kswapd, thus we will never get
+	 * into a priority inversion deadlock.
+	 *
+	 * we definitely have to have equal or higher priority than
+	 * bdflush, otherwise bdflush will deadlock if there are too
+	 * many dirty RAID5 blocks.
+	 */
+	unlock_kernel();
+
+	complete(thread->event);
+	while (thread->run) {
+		void (*run)(mddev_t *);
+
+		wait_event_interruptible(thread->wqueue,
+					 test_bit(THREAD_WAKEUP, &thread->flags));
+		if (current->flags & PF_FREEZE)
+			refrigerator(PF_FREEZE);
+
+		clear_bit(THREAD_WAKEUP, &thread->flags);
+
+		run = thread->run;
+		if (run)
+			run(thread->mddev);
+
+		if (signal_pending(current))
+			flush_signals(current);
+	}
+	complete(thread->event);
+	return 0;
+}
+
+void md_wakeup_thread(mdk_thread_t *thread)
+{
+	if (thread) {
+		dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
+		set_bit(THREAD_WAKEUP, &thread->flags);
+		wake_up(&thread->wqueue);
+	}
+}
+
+mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
+				 const char *name)
+{
+	mdk_thread_t *thread;
+	int ret;
+	struct completion event;
+
+	thread = (mdk_thread_t *) kmalloc
+				(sizeof(mdk_thread_t), GFP_KERNEL);
+	if (!thread)
+		return NULL;
+
+	memset(thread, 0, sizeof(mdk_thread_t));
+	init_waitqueue_head(&thread->wqueue);
+
+	init_completion(&event);
+	thread->event = &event;
+	thread->run = run;
+	thread->mddev = mddev;
+	thread->name = name;
+	ret = kernel_thread(md_thread, thread, 0);
+	if (ret < 0) {
+		kfree(thread);
+		return NULL;
+	}
+	wait_for_completion(&event);
+	return thread;
+}
+
+static void md_interrupt_thread(mdk_thread_t *thread)
+{
+	if (!thread->tsk) {
+		MD_BUG();
+		return;
+	}
+	dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
+	send_sig(SIGKILL, thread->tsk, 1);
+}
+
+void md_unregister_thread(mdk_thread_t *thread)
+{
+	struct completion event;
+
+	init_completion(&event);
+
+	thread->event = &event;
+	thread->run = NULL;
+	thread->name = NULL;
+	md_interrupt_thread(thread);
+	wait_for_completion(&event);
+	kfree(thread);
+}
+
+void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+	if (!mddev) {
+		MD_BUG();
+		return;
+	}
+
+	if (!rdev || rdev->faulty)
+		return;
+
+	dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
+		mdname(mddev),
+		MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
+		__builtin_return_address(0),__builtin_return_address(1),
+		__builtin_return_address(2),__builtin_return_address(3));
+
+	if (!mddev->pers->error_handler)
+		return;
+	mddev->pers->error_handler(mddev,rdev);
+	set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+	md_wakeup_thread(mddev->thread);
+}
+
+/* seq_file implementation /proc/mdstat */
+
+static void status_unused(struct seq_file *seq)
+{
+	int i = 0;
+	mdk_rdev_t *rdev;
+	struct list_head *tmp;
+
+	seq_printf(seq, "unused devices: ");
+
+	ITERATE_RDEV_PENDING(rdev,tmp) {
+		char b[BDEVNAME_SIZE];
+		i++;
+		seq_printf(seq, "%s ",
+			      bdevname(rdev->bdev,b));
+	}
+	if (!i)
+		seq_printf(seq, "<none>");
+
+	seq_printf(seq, "\n");
+}
+
+
+static void status_resync(struct seq_file *seq, mddev_t * mddev)
+{
+	unsigned long max_blocks, resync, res, dt, db, rt;
+
+	resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
+
+	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+		max_blocks = mddev->resync_max_sectors >> 1;
+	else
+		max_blocks = mddev->size;
+
+	/*
+	 * Should not happen.
+	 */
+	if (!max_blocks) {
+		MD_BUG();
+		return;
+	}
+	res = (resync/1024)*1000/(max_blocks/1024 + 1);
+	{
+		int i, x = res/50, y = 20-x;
+		seq_printf(seq, "[");
+		for (i = 0; i < x; i++)
+			seq_printf(seq, "=");
+		seq_printf(seq, ">");
+		for (i = 0; i < y; i++)
+			seq_printf(seq, ".");
+		seq_printf(seq, "] ");
+	}
+	seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
+		      (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
+		       "resync" : "recovery"),
+		      res/10, res % 10, resync, max_blocks);
+
+	/*
+	 * We do not want to overflow, so the order of operands and
+	 * the * 100 / 100 trick are important. We do a +1 to be
+	 * safe against division by zero. We only estimate anyway.
+	 *
+	 * dt: time from mark until now
+	 * db: blocks written from mark until now
+	 * rt: remaining time
+	 */
+	dt = ((jiffies - mddev->resync_mark) / HZ);
+	if (!dt) dt++;
+	db = resync - (mddev->resync_mark_cnt/2);
+	rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
+
+	seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
+
+	seq_printf(seq, " speed=%ldK/sec", db/dt);
+}
+
+static void *md_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	struct list_head *tmp;
+	loff_t l = *pos;
+	mddev_t *mddev;
+
+	if (l >= 0x10000)
+		return NULL;
+	if (!l--)
+		/* header */
+		return (void*)1;
+
+	spin_lock(&all_mddevs_lock);
+	list_for_each(tmp,&all_mddevs)
+		if (!l--) {
+			mddev = list_entry(tmp, mddev_t, all_mddevs);
+			mddev_get(mddev);
+			spin_unlock(&all_mddevs_lock);
+			return mddev;
+		}
+	spin_unlock(&all_mddevs_lock);
+	if (!l--)
+		return (void*)2;/* tail */
+	return NULL;
+}
+
+static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct list_head *tmp;
+	mddev_t *next_mddev, *mddev = v;
+	
+	++*pos;
+	if (v == (void*)2)
+		return NULL;
+
+	spin_lock(&all_mddevs_lock);
+	if (v == (void*)1)
+		tmp = all_mddevs.next;
+	else
+		tmp = mddev->all_mddevs.next;
+	if (tmp != &all_mddevs)
+		next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
+	else {
+		next_mddev = (void*)2;
+		*pos = 0x10000;
+	}		
+	spin_unlock(&all_mddevs_lock);
+
+	if (v != (void*)1)
+		mddev_put(mddev);
+	return next_mddev;
+
+}
+
+static void md_seq_stop(struct seq_file *seq, void *v)
+{
+	mddev_t *mddev = v;
+
+	if (mddev && v != (void*)1 && v != (void*)2)
+		mddev_put(mddev);
+}
+
+static int md_seq_show(struct seq_file *seq, void *v)
+{
+	mddev_t *mddev = v;
+	sector_t size;
+	struct list_head *tmp2;
+	mdk_rdev_t *rdev;
+	int i;
+
+	if (v == (void*)1) {
+		seq_printf(seq, "Personalities : ");
+		spin_lock(&pers_lock);
+		for (i = 0; i < MAX_PERSONALITY; i++)
+			if (pers[i])
+				seq_printf(seq, "[%s] ", pers[i]->name);
+
+		spin_unlock(&pers_lock);
+		seq_printf(seq, "\n");
+		return 0;
+	}
+	if (v == (void*)2) {
+		status_unused(seq);
+		return 0;
+	}
+
+	if (mddev_lock(mddev)!=0) 
+		return -EINTR;
+	if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
+		seq_printf(seq, "%s : %sactive", mdname(mddev),
+						mddev->pers ? "" : "in");
+		if (mddev->pers) {
+			if (mddev->ro)
+				seq_printf(seq, " (read-only)");
+			seq_printf(seq, " %s", mddev->pers->name);
+		}
+
+		size = 0;
+		ITERATE_RDEV(mddev,rdev,tmp2) {
+			char b[BDEVNAME_SIZE];
+			seq_printf(seq, " %s[%d]",
+				bdevname(rdev->bdev,b), rdev->desc_nr);
+			if (rdev->faulty) {
+				seq_printf(seq, "(F)");
+				continue;
+			}
+			size += rdev->size;
+		}
+
+		if (!list_empty(&mddev->disks)) {
+			if (mddev->pers)
+				seq_printf(seq, "\n      %llu blocks",
+					(unsigned long long)mddev->array_size);
+			else
+				seq_printf(seq, "\n      %llu blocks",
+					(unsigned long long)size);
+		}
+
+		if (mddev->pers) {
+			mddev->pers->status (seq, mddev);
+	 		seq_printf(seq, "\n      ");
+			if (mddev->curr_resync > 2)
+				status_resync (seq, mddev);
+			else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
+				seq_printf(seq, "	resync=DELAYED");
+		}
+
+		seq_printf(seq, "\n");
+	}
+	mddev_unlock(mddev);
+	
+	return 0;
+}
+
+static struct seq_operations md_seq_ops = {
+	.start  = md_seq_start,
+	.next   = md_seq_next,
+	.stop   = md_seq_stop,
+	.show   = md_seq_show,
+};
+
+static int md_seq_open(struct inode *inode, struct file *file)
+{
+	int error;
+
+	error = seq_open(file, &md_seq_ops);
+	return error;
+}
+
+static struct file_operations md_seq_fops = {
+	.open           = md_seq_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.release	= seq_release,
+};
+
+int register_md_personality(int pnum, mdk_personality_t *p)
+{
+	if (pnum >= MAX_PERSONALITY) {
+		printk(KERN_ERR
+		       "md: tried to install personality %s as nr %d, but max is %lu\n",
+		       p->name, pnum, MAX_PERSONALITY-1);
+		return -EINVAL;
+	}
+
+	spin_lock(&pers_lock);
+	if (pers[pnum]) {
+		spin_unlock(&pers_lock);
+		MD_BUG();
+		return -EBUSY;
+	}
+
+	pers[pnum] = p;
+	printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum);
+	spin_unlock(&pers_lock);
+	return 0;
+}
+
+int unregister_md_personality(int pnum)
+{
+	if (pnum >= MAX_PERSONALITY) {
+		MD_BUG();
+		return -EINVAL;
+	}
+
+	printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name);
+	spin_lock(&pers_lock);
+	pers[pnum] = NULL;
+	spin_unlock(&pers_lock);
+	return 0;
+}
+
+static int is_mddev_idle(mddev_t *mddev)
+{
+	mdk_rdev_t * rdev;
+	struct list_head *tmp;
+	int idle;
+	unsigned long curr_events;
+
+	idle = 1;
+	ITERATE_RDEV(mddev,rdev,tmp) {
+		struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
+		curr_events = disk_stat_read(disk, read_sectors) + 
+				disk_stat_read(disk, write_sectors) - 
+				atomic_read(&disk->sync_io);
+		/* Allow some slack between valud of curr_events and last_events,
+		 * as there are some uninteresting races.
+		 * Note: the following is an unsigned comparison.
+		 */
+		if ((curr_events - rdev->last_events + 32) > 64) {
+			rdev->last_events = curr_events;
+			idle = 0;
+		}
+	}
+	return idle;
+}
+
+void md_done_sync(mddev_t *mddev, int blocks, int ok)
+{
+	/* another "blocks" (512byte) blocks have been synced */
+	atomic_sub(blocks, &mddev->recovery_active);
+	wake_up(&mddev->recovery_wait);
+	if (!ok) {
+		set_bit(MD_RECOVERY_ERR, &mddev->recovery);
+		md_wakeup_thread(mddev->thread);
+		// stop recovery, signal do_sync ....
+	}
+}
+
+
+void md_write_start(mddev_t *mddev)
+{
+	if (!atomic_read(&mddev->writes_pending)) {
+		mddev_lock_uninterruptible(mddev);
+		if (mddev->in_sync) {
+			mddev->in_sync = 0;
+ 			del_timer(&mddev->safemode_timer);
+			md_update_sb(mddev);
+		}
+		atomic_inc(&mddev->writes_pending);
+		mddev_unlock(mddev);
+	} else
+		atomic_inc(&mddev->writes_pending);
+}
+
+void md_write_end(mddev_t *mddev)
+{
+	if (atomic_dec_and_test(&mddev->writes_pending)) {
+		if (mddev->safemode == 2)
+			md_wakeup_thread(mddev->thread);
+		else
+			mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
+	}
+}
+
+static inline void md_enter_safemode(mddev_t *mddev)
+{
+	if (!mddev->safemode) return;
+	if (mddev->safemode == 2 &&
+	    (atomic_read(&mddev->writes_pending) || mddev->in_sync ||
+		    mddev->recovery_cp != MaxSector))
+		return; /* avoid the lock */
+	mddev_lock_uninterruptible(mddev);
+	if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
+	    !mddev->in_sync && mddev->recovery_cp == MaxSector) {
+		mddev->in_sync = 1;
+		md_update_sb(mddev);
+	}
+	mddev_unlock(mddev);
+
+	if (mddev->safemode == 1)
+		mddev->safemode = 0;
+}
+
+void md_handle_safemode(mddev_t *mddev)
+{
+	if (signal_pending(current)) {
+		printk(KERN_INFO "md: %s in immediate safe mode\n",
+			mdname(mddev));
+		mddev->safemode = 2;
+		flush_signals(current);
+	}
+	md_enter_safemode(mddev);
+}
+
+
+DECLARE_WAIT_QUEUE_HEAD(resync_wait);
+
+#define SYNC_MARKS	10
+#define	SYNC_MARK_STEP	(3*HZ)
+static void md_do_sync(mddev_t *mddev)
+{
+	mddev_t *mddev2;
+	unsigned int currspeed = 0,
+		 window;
+	sector_t max_sectors,j;
+	unsigned long mark[SYNC_MARKS];
+	sector_t mark_cnt[SYNC_MARKS];
+	int last_mark,m;
+	struct list_head *tmp;
+	sector_t last_check;
+
+	/* just incase thread restarts... */
+	if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
+		return;
+
+	/* we overload curr_resync somewhat here.
+	 * 0 == not engaged in resync at all
+	 * 2 == checking that there is no conflict with another sync
+	 * 1 == like 2, but have yielded to allow conflicting resync to
+	 *		commense
+	 * other == active in resync - this many blocks
+	 *
+	 * Before starting a resync we must have set curr_resync to
+	 * 2, and then checked that every "conflicting" array has curr_resync
+	 * less than ours.  When we find one that is the same or higher
+	 * we wait on resync_wait.  To avoid deadlock, we reduce curr_resync
+	 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
+	 * This will mean we have to start checking from the beginning again.
+	 *
+	 */
+
+	do {
+		mddev->curr_resync = 2;
+
+	try_again:
+		if (signal_pending(current)) {
+			flush_signals(current);
+			goto skip;
+		}
+		ITERATE_MDDEV(mddev2,tmp) {
+			printk(".");
+			if (mddev2 == mddev)
+				continue;
+			if (mddev2->curr_resync && 
+			    match_mddev_units(mddev,mddev2)) {
+				DEFINE_WAIT(wq);
+				if (mddev < mddev2 && mddev->curr_resync == 2) {
+					/* arbitrarily yield */
+					mddev->curr_resync = 1;
+					wake_up(&resync_wait);
+				}
+				if (mddev > mddev2 && mddev->curr_resync == 1)
+					/* no need to wait here, we can wait the next
+					 * time 'round when curr_resync == 2
+					 */
+					continue;
+				prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
+				if (!signal_pending(current)
+				    && mddev2->curr_resync >= mddev->curr_resync) {
+					printk(KERN_INFO "md: delaying resync of %s"
+					       " until %s has finished resync (they"
+					       " share one or more physical units)\n",
+					       mdname(mddev), mdname(mddev2));
+					mddev_put(mddev2);
+					schedule();
+					finish_wait(&resync_wait, &wq);
+					goto try_again;
+				}
+				finish_wait(&resync_wait, &wq);
+			}
+		}
+	} while (mddev->curr_resync < 2);
+
+	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+		/* resync follows the size requested by the personality,
+		 * which default to physical size, but can be virtual size
+		 */
+		max_sectors = mddev->resync_max_sectors;
+	else
+		/* recovery follows the physical size of devices */
+		max_sectors = mddev->size << 1;
+
+	printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
+	printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
+		" %d KB/sec/disc.\n", sysctl_speed_limit_min);
+	printk(KERN_INFO "md: using maximum available idle IO bandwith "
+	       "(but not more than %d KB/sec) for reconstruction.\n",
+	       sysctl_speed_limit_max);
+
+	is_mddev_idle(mddev); /* this also initializes IO event counters */
+	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
+		j = mddev->recovery_cp;
+	else
+		j = 0;
+	for (m = 0; m < SYNC_MARKS; m++) {
+		mark[m] = jiffies;
+		mark_cnt[m] = j;
+	}
+	last_mark = 0;
+	mddev->resync_mark = mark[last_mark];
+	mddev->resync_mark_cnt = mark_cnt[last_mark];
+
+	/*
+	 * Tune reconstruction:
+	 */
+	window = 32*(PAGE_SIZE/512);
+	printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
+		window/2,(unsigned long long) max_sectors/2);
+
+	atomic_set(&mddev->recovery_active, 0);
+	init_waitqueue_head(&mddev->recovery_wait);
+	last_check = 0;
+
+	if (j>2) {
+		printk(KERN_INFO 
+			"md: resuming recovery of %s from checkpoint.\n",
+			mdname(mddev));
+		mddev->curr_resync = j;
+	}
+
+	while (j < max_sectors) {
+		int sectors;
+
+		sectors = mddev->pers->sync_request(mddev, j, currspeed < sysctl_speed_limit_min);
+		if (sectors < 0) {
+			set_bit(MD_RECOVERY_ERR, &mddev->recovery);
+			goto out;
+		}
+		atomic_add(sectors, &mddev->recovery_active);
+		j += sectors;
+		if (j>1) mddev->curr_resync = j;
+
+		if (last_check + window > j || j == max_sectors)
+			continue;
+
+		last_check = j;
+
+		if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
+		    test_bit(MD_RECOVERY_ERR, &mddev->recovery))
+			break;
+
+	repeat:
+		if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
+			/* step marks */
+			int next = (last_mark+1) % SYNC_MARKS;
+
+			mddev->resync_mark = mark[next];
+			mddev->resync_mark_cnt = mark_cnt[next];
+			mark[next] = jiffies;
+			mark_cnt[next] = j - atomic_read(&mddev->recovery_active);
+			last_mark = next;
+		}
+
+
+		if (signal_pending(current)) {
+			/*
+			 * got a signal, exit.
+			 */
+			printk(KERN_INFO 
+				"md: md_do_sync() got signal ... exiting\n");
+			flush_signals(current);
+			set_bit(MD_RECOVERY_INTR, &mddev->recovery);
+			goto out;
+		}
+
+		/*
+		 * this loop exits only if either when we are slower than
+		 * the 'hard' speed limit, or the system was IO-idle for
+		 * a jiffy.
+		 * the system might be non-idle CPU-wise, but we only care
+		 * about not overloading the IO subsystem. (things like an
+		 * e2fsck being done on the RAID array should execute fast)
+		 */
+		mddev->queue->unplug_fn(mddev->queue);
+		cond_resched();
+
+		currspeed = ((unsigned long)(j-mddev->resync_mark_cnt))/2/((jiffies-mddev->resync_mark)/HZ +1) +1;
+
+		if (currspeed > sysctl_speed_limit_min) {
+			if ((currspeed > sysctl_speed_limit_max) ||
+					!is_mddev_idle(mddev)) {
+				msleep_interruptible(250);
+				goto repeat;
+			}
+		}
+	}
+	printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
+	/*
+	 * this also signals 'finished resyncing' to md_stop
+	 */
+ out:
+	mddev->queue->unplug_fn(mddev->queue);
+
+	wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
+
+	/* tell personality that we are finished */
+	mddev->pers->sync_request(mddev, max_sectors, 1);
+
+	if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
+	    mddev->curr_resync > 2 &&
+	    mddev->curr_resync >= mddev->recovery_cp) {
+		if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
+			printk(KERN_INFO 
+				"md: checkpointing recovery of %s.\n",
+				mdname(mddev));
+			mddev->recovery_cp = mddev->curr_resync;
+		} else
+			mddev->recovery_cp = MaxSector;
+	}
+
+	md_enter_safemode(mddev);
+ skip:
+	mddev->curr_resync = 0;
+	wake_up(&resync_wait);
+	set_bit(MD_RECOVERY_DONE, &mddev->recovery);
+	md_wakeup_thread(mddev->thread);
+}
+
+
+/*
+ * This routine is regularly called by all per-raid-array threads to
+ * deal with generic issues like resync and super-block update.
+ * Raid personalities that don't have a thread (linear/raid0) do not
+ * need this as they never do any recovery or update the superblock.
+ *
+ * It does not do any resync itself, but rather "forks" off other threads
+ * to do that as needed.
+ * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
+ * "->recovery" and create a thread at ->sync_thread.
+ * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
+ * and wakeups up this thread which will reap the thread and finish up.
+ * This thread also removes any faulty devices (with nr_pending == 0).
+ *
+ * The overall approach is:
+ *  1/ if the superblock needs updating, update it.
+ *  2/ If a recovery thread is running, don't do anything else.
+ *  3/ If recovery has finished, clean up, possibly marking spares active.
+ *  4/ If there are any faulty devices, remove them.
+ *  5/ If array is degraded, try to add spares devices
+ *  6/ If array has spares or is not in-sync, start a resync thread.
+ */
+void md_check_recovery(mddev_t *mddev)
+{
+	mdk_rdev_t *rdev;
+	struct list_head *rtmp;
+
+
+	dprintk(KERN_INFO "md: recovery thread got woken up ...\n");
+
+	if (mddev->ro)
+		return;
+	if ( ! (
+		mddev->sb_dirty ||
+		test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
+		test_bit(MD_RECOVERY_DONE, &mddev->recovery)
+		))
+		return;
+	if (mddev_trylock(mddev)==0) {
+		int spares =0;
+		if (mddev->sb_dirty)
+			md_update_sb(mddev);
+		if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
+		    !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
+			/* resync/recovery still happening */
+			clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+			goto unlock;
+		}
+		if (mddev->sync_thread) {
+			/* resync has finished, collect result */
+			md_unregister_thread(mddev->sync_thread);
+			mddev->sync_thread = NULL;
+			if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
+			    !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
+				/* success...*/
+				/* activate any spares */
+				mddev->pers->spare_active(mddev);
+			}
+			md_update_sb(mddev);
+			mddev->recovery = 0;
+			/* flag recovery needed just to double check */
+			set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
+			goto unlock;
+		}
+		if (mddev->recovery)
+			/* probably just the RECOVERY_NEEDED flag */
+			mddev->recovery = 0;
+
+		/* no recovery is running.
+		 * remove any failed drives, then
+		 * add spares if possible.
+		 * Spare are also removed and re-added, to allow
+		 * the personality to fail the re-add.
+		 */
+		ITERATE_RDEV(mddev,rdev,rtmp)
+			if (rdev->raid_disk >= 0 &&
+			    (rdev->faulty || ! rdev->in_sync) &&
+			    atomic_read(&rdev->nr_pending)==0) {
+				if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0)
+					rdev->raid_disk = -1;
+			}
+
+		if (mddev->degraded) {
+			ITERATE_RDEV(mddev,rdev,rtmp)
+				if (rdev->raid_disk < 0
+				    && !rdev->faulty) {
+					if (mddev->pers->hot_add_disk(mddev,rdev))
+						spares++;
+					else
+						break;
+				}
+		}
+
+		if (!spares && (mddev->recovery_cp == MaxSector )) {
+			/* nothing we can do ... */
+			goto unlock;
+		}
+		if (mddev->pers->sync_request) {
+			set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
+			if (!spares)
+				set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
+			mddev->sync_thread = md_register_thread(md_do_sync,
+								mddev,
+								"%s_resync");
+			if (!mddev->sync_thread) {
+				printk(KERN_ERR "%s: could not start resync"
+					" thread...\n", 
+					mdname(mddev));
+				/* leave the spares where they are, it shouldn't hurt */
+				mddev->recovery = 0;
+			} else {
+				md_wakeup_thread(mddev->sync_thread);
+			}
+		}
+	unlock:
+		mddev_unlock(mddev);
+	}
+}
+
+int md_notify_reboot(struct notifier_block *this,
+					unsigned long code, void *x)
+{
+	struct list_head *tmp;
+	mddev_t *mddev;
+
+	if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
+
+		printk(KERN_INFO "md: stopping all md devices.\n");
+
+		ITERATE_MDDEV(mddev,tmp)
+			if (mddev_trylock(mddev)==0)
+				do_md_stop (mddev, 1);
+		/*
+		 * certain more exotic SCSI devices are known to be
+		 * volatile wrt too early system reboots. While the
+		 * right place to handle this issue is the given
+		 * driver, we do want to have a safe RAID driver ...
+		 */
+		mdelay(1000*1);
+	}
+	return NOTIFY_DONE;
+}
+
+struct notifier_block md_notifier = {
+	.notifier_call	= md_notify_reboot,
+	.next		= NULL,
+	.priority	= INT_MAX, /* before any real devices */
+};
+
+static void md_geninit(void)
+{
+	struct proc_dir_entry *p;
+
+	dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
+
+	p = create_proc_entry("mdstat", S_IRUGO, NULL);
+	if (p)
+		p->proc_fops = &md_seq_fops;
+}
+
+int __init md_init(void)
+{
+	int minor;
+
+	printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
+			" MD_SB_DISKS=%d\n",
+			MD_MAJOR_VERSION, MD_MINOR_VERSION,
+			MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
+
+	if (register_blkdev(MAJOR_NR, "md"))
+		return -1;
+	if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
+		unregister_blkdev(MAJOR_NR, "md");
+		return -1;
+	}
+	devfs_mk_dir("md");
+	blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
+				md_probe, NULL, NULL);
+	blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
+			    md_probe, NULL, NULL);
+
+	for (minor=0; minor < MAX_MD_DEVS; ++minor)
+		devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
+				S_IFBLK|S_IRUSR|S_IWUSR,
+				"md/%d", minor);
+
+	for (minor=0; minor < MAX_MD_DEVS; ++minor)
+		devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
+			      S_IFBLK|S_IRUSR|S_IWUSR,
+			      "md/mdp%d", minor);
+
+
+	register_reboot_notifier(&md_notifier);
+	raid_table_header = register_sysctl_table(raid_root_table, 1);
+
+	md_geninit();
+	return (0);
+}
+
+
+#ifndef MODULE
+
+/*
+ * Searches all registered partitions for autorun RAID arrays
+ * at boot time.
+ */
+static dev_t detected_devices[128];
+static int dev_cnt;
+
+void md_autodetect_dev(dev_t dev)
+{
+	if (dev_cnt >= 0 && dev_cnt < 127)
+		detected_devices[dev_cnt++] = dev;
+}
+
+
+static void autostart_arrays(int part)
+{
+	mdk_rdev_t *rdev;
+	int i;
+
+	printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
+
+	for (i = 0; i < dev_cnt; i++) {
+		dev_t dev = detected_devices[i];
+
+		rdev = md_import_device(dev,0, 0);
+		if (IS_ERR(rdev))
+			continue;
+
+		if (rdev->faulty) {
+			MD_BUG();
+			continue;
+		}
+		list_add(&rdev->same_set, &pending_raid_disks);
+	}
+	dev_cnt = 0;
+
+	autorun_devices(part);
+}
+
+#endif
+
+static __exit void md_exit(void)
+{
+	mddev_t *mddev;
+	struct list_head *tmp;
+	int i;
+	blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
+	blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
+	for (i=0; i < MAX_MD_DEVS; i++)
+		devfs_remove("md/%d", i);
+	for (i=0; i < MAX_MD_DEVS; i++)
+		devfs_remove("md/d%d", i);
+
+	devfs_remove("md");
+
+	unregister_blkdev(MAJOR_NR,"md");
+	unregister_blkdev(mdp_major, "mdp");
+	unregister_reboot_notifier(&md_notifier);
+	unregister_sysctl_table(raid_table_header);
+	remove_proc_entry("mdstat", NULL);
+	ITERATE_MDDEV(mddev,tmp) {
+		struct gendisk *disk = mddev->gendisk;
+		if (!disk)
+			continue;
+		export_array(mddev);
+		del_gendisk(disk);
+		put_disk(disk);
+		mddev->gendisk = NULL;
+		mddev_put(mddev);
+	}
+}
+
+module_init(md_init)
+module_exit(md_exit)
+
+EXPORT_SYMBOL(register_md_personality);
+EXPORT_SYMBOL(unregister_md_personality);
+EXPORT_SYMBOL(md_error);
+EXPORT_SYMBOL(md_done_sync);
+EXPORT_SYMBOL(md_write_start);
+EXPORT_SYMBOL(md_write_end);
+EXPORT_SYMBOL(md_handle_safemode);
+EXPORT_SYMBOL(md_register_thread);
+EXPORT_SYMBOL(md_unregister_thread);
+EXPORT_SYMBOL(md_wakeup_thread);
+EXPORT_SYMBOL(md_print_devices);
+EXPORT_SYMBOL(md_check_recovery);
+MODULE_LICENSE("GPL");