Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 8342 deletions

diff --git a/ANDROID_3.4.5/drivers/md/md.c b/ANDROID_3.4.5/drivers/md/md.c
deleted file mode 100644
index 2b30ffdb..00000000
--- a/ANDROID_3.4.5/drivers/md/md.c
+++ /dev/null
@@ -1,8342 +0,0 @@
-/*
-   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>.
-
-   - persistent bitmap code
-     Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
-
-   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/kthread.h>
-#include <linux/blkdev.h>
-#include <linux/sysctl.h>
-#include <linux/seq_file.h>
-#include <linux/fs.h>
-#include <linux/poll.h>
-#include <linux/ctype.h>
-#include <linux/string.h>
-#include <linux/hdreg.h>
-#include <linux/proc_fs.h>
-#include <linux/random.h>
-#include <linux/module.h>
-#include <linux/reboot.h>
-#include <linux/file.h>
-#include <linux/compat.h>
-#include <linux/delay.h>
-#include <linux/raid/md_p.h>
-#include <linux/raid/md_u.h>
-#include <linux/slab.h>
-#include "md.h"
-#include "bitmap.h"
-
-#ifndef MODULE
-static void autostart_arrays(int part);
-#endif
-
-/* pers_list is a list of registered personalities protected
- * by pers_lock.
- * pers_lock does extra service to protect accesses to
- * mddev->thread when the mutex cannot be held.
- */
-static LIST_HEAD(pers_list);
-static DEFINE_SPINLOCK(pers_lock);
-
-static void md_print_devices(void);
-
-static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
-static struct workqueue_struct *md_wq;
-static struct workqueue_struct *md_misc_wq;
-
-#define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
-
-/*
- * Default number of read corrections we'll attempt on an rdev
- * before ejecting it from the array. We divide the read error
- * count by 2 for every hour elapsed between read errors.
- */
-#define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
-/*
- * 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 bandwidth 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.
- * or /sys/block/mdX/md/sync_speed_{min,max}
- */
-
-static int sysctl_speed_limit_min = 1000;
-static int sysctl_speed_limit_max = 200000;
-static inline int speed_min(struct mddev *mddev)
-{
-	return mddev->sync_speed_min ?
-		mddev->sync_speed_min : sysctl_speed_limit_min;
-}
-
-static inline int speed_max(struct mddev *mddev)
-{
-	return mddev->sync_speed_max ?
-		mddev->sync_speed_max : sysctl_speed_limit_max;
-}
-
-static struct ctl_table_header *raid_table_header;
-
-static ctl_table raid_table[] = {
-	{
-		.procname	= "speed_limit_min",
-		.data		= &sysctl_speed_limit_min,
-		.maxlen		= sizeof(int),
-		.mode		= S_IRUGO|S_IWUSR,
-		.proc_handler	= proc_dointvec,
-	},
-	{
-		.procname	= "speed_limit_max",
-		.data		= &sysctl_speed_limit_max,
-		.maxlen		= sizeof(int),
-		.mode		= S_IRUGO|S_IWUSR,
-		.proc_handler	= proc_dointvec,
-	},
-	{ }
-};
-
-static ctl_table raid_dir_table[] = {
-	{
-		.procname	= "raid",
-		.maxlen		= 0,
-		.mode		= S_IRUGO|S_IXUGO,
-		.child		= raid_table,
-	},
-	{ }
-};
-
-static ctl_table raid_root_table[] = {
-	{
-		.procname	= "dev",
-		.maxlen		= 0,
-		.mode		= 0555,
-		.child		= raid_dir_table,
-	},
-	{  }
-};
-
-static const struct block_device_operations md_fops;
-
-static int start_readonly;
-
-/* bio_clone_mddev
- * like bio_clone, but with a local bio set
- */
-
-static void mddev_bio_destructor(struct bio *bio)
-{
-	struct mddev *mddev, **mddevp;
-
-	mddevp = (void*)bio;
-	mddev = mddevp[-1];
-
-	bio_free(bio, mddev->bio_set);
-}
-
-struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
-			    struct mddev *mddev)
-{
-	struct bio *b;
-	struct mddev **mddevp;
-
-	if (!mddev || !mddev->bio_set)
-		return bio_alloc(gfp_mask, nr_iovecs);
-
-	b = bio_alloc_bioset(gfp_mask, nr_iovecs,
-			     mddev->bio_set);
-	if (!b)
-		return NULL;
-	mddevp = (void*)b;
-	mddevp[-1] = mddev;
-	b->bi_destructor = mddev_bio_destructor;
-	return b;
-}
-EXPORT_SYMBOL_GPL(bio_alloc_mddev);
-
-struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
-			    struct mddev *mddev)
-{
-	struct bio *b;
-	struct mddev **mddevp;
-
-	if (!mddev || !mddev->bio_set)
-		return bio_clone(bio, gfp_mask);
-
-	b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs,
-			     mddev->bio_set);
-	if (!b)
-		return NULL;
-	mddevp = (void*)b;
-	mddevp[-1] = mddev;
-	b->bi_destructor = mddev_bio_destructor;
-	__bio_clone(b, bio);
-	if (bio_integrity(bio)) {
-		int ret;
-
-		ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set);
-
-		if (ret < 0) {
-			bio_put(b);
-			return NULL;
-		}
-	}
-
-	return b;
-}
-EXPORT_SYMBOL_GPL(bio_clone_mddev);
-
-void md_trim_bio(struct bio *bio, int offset, int size)
-{
-	/* 'bio' is a cloned bio which we need to trim to match
-	 * the given offset and size.
-	 * This requires adjusting bi_sector, bi_size, and bi_io_vec
-	 */
-	int i;
-	struct bio_vec *bvec;
-	int sofar = 0;
-
-	size <<= 9;
-	if (offset == 0 && size == bio->bi_size)
-		return;
-
-	bio->bi_sector += offset;
-	bio->bi_size = size;
-	offset <<= 9;
-	clear_bit(BIO_SEG_VALID, &bio->bi_flags);
-
-	while (bio->bi_idx < bio->bi_vcnt &&
-	       bio->bi_io_vec[bio->bi_idx].bv_len <= offset) {
-		/* remove this whole bio_vec */
-		offset -= bio->bi_io_vec[bio->bi_idx].bv_len;
-		bio->bi_idx++;
-	}
-	if (bio->bi_idx < bio->bi_vcnt) {
-		bio->bi_io_vec[bio->bi_idx].bv_offset += offset;
-		bio->bi_io_vec[bio->bi_idx].bv_len -= offset;
-	}
-	/* avoid any complications with bi_idx being non-zero*/
-	if (bio->bi_idx) {
-		memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx,
-			(bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec));
-		bio->bi_vcnt -= bio->bi_idx;
-		bio->bi_idx = 0;
-	}
-	/* Make sure vcnt and last bv are not too big */
-	bio_for_each_segment(bvec, bio, i) {
-		if (sofar + bvec->bv_len > size)
-			bvec->bv_len = size - sofar;
-		if (bvec->bv_len == 0) {
-			bio->bi_vcnt = i;
-			break;
-		}
-		sofar += bvec->bv_len;
-	}
-}
-EXPORT_SYMBOL_GPL(md_trim_bio);
-
-/*
- * We have a system wide 'event count' that is incremented
- * on any 'interesting' event, and readers of /proc/mdstat
- * can use 'poll' or 'select' to find out when the event
- * count increases.
- *
- * Events are:
- *  start array, stop array, error, add device, remove device,
- *  start build, activate spare
- */
-static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
-static atomic_t md_event_count;
-void md_new_event(struct mddev *mddev)
-{
-	atomic_inc(&md_event_count);
-	wake_up(&md_event_waiters);
-}
-EXPORT_SYMBOL_GPL(md_new_event);
-
-/* Alternate version that can be called from interrupts
- * when calling sysfs_notify isn't needed.
- */
-static void md_new_event_inintr(struct mddev *mddev)
-{
-	atomic_inc(&md_event_count);
-	wake_up(&md_event_waiters);
-}
-
-/*
- * 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 for_each_mddev(_mddev,_tmp)					\
-									\
-	for (({ spin_lock(&all_mddevs_lock); 				\
-		_tmp = all_mddevs.next;					\
-		_mddev = NULL;});					\
-	     ({ if (_tmp != &all_mddevs)				\
-			mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
-		spin_unlock(&all_mddevs_lock);				\
-		if (_mddev) mddev_put(_mddev);				\
-		_mddev = list_entry(_tmp, struct mddev, all_mddevs);	\
-		_tmp != &all_mddevs;});					\
-	     ({ spin_lock(&all_mddevs_lock);				\
-		_tmp = _tmp->next;})					\
-		)
-
-
-/* Rather than calling directly into the personality make_request function,
- * IO requests come here first so that we can check if the device is
- * being suspended pending a reconfiguration.
- * We hold a refcount over the call to ->make_request.  By the time that
- * call has finished, the bio has been linked into some internal structure
- * and so is visible to ->quiesce(), so we don't need the refcount any more.
- */
-static void md_make_request(struct request_queue *q, struct bio *bio)
-{
-	const int rw = bio_data_dir(bio);
-	struct mddev *mddev = q->queuedata;
-	int cpu;
-	unsigned int sectors;
-
-	if (mddev == NULL || mddev->pers == NULL
-	    || !mddev->ready) {
-		bio_io_error(bio);
-		return;
-	}
-	smp_rmb(); /* Ensure implications of  'active' are visible */
-	rcu_read_lock();
-	if (mddev->suspended) {
-		DEFINE_WAIT(__wait);
-		for (;;) {
-			prepare_to_wait(&mddev->sb_wait, &__wait,
-					TASK_UNINTERRUPTIBLE);
-			if (!mddev->suspended)
-				break;
-			rcu_read_unlock();
-			schedule();
-			rcu_read_lock();
-		}
-		finish_wait(&mddev->sb_wait, &__wait);
-	}
-	atomic_inc(&mddev->active_io);
-	rcu_read_unlock();
-
-	/*
-	 * save the sectors now since our bio can
-	 * go away inside make_request
-	 */
-	sectors = bio_sectors(bio);
-	mddev->pers->make_request(mddev, bio);
-
-	cpu = part_stat_lock();
-	part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
-	part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors);
-	part_stat_unlock();
-
-	if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
-		wake_up(&mddev->sb_wait);
-}
-
-/* mddev_suspend makes sure no new requests are submitted
- * to the device, and that any requests that have been submitted
- * are completely handled.
- * Once ->stop is called and completes, the module will be completely
- * unused.
- */
-void mddev_suspend(struct mddev *mddev)
-{
-	BUG_ON(mddev->suspended);
-	mddev->suspended = 1;
-	synchronize_rcu();
-	wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
-	mddev->pers->quiesce(mddev, 1);
-
-	del_timer_sync(&mddev->safemode_timer);
-}
-EXPORT_SYMBOL_GPL(mddev_suspend);
-
-void mddev_resume(struct mddev *mddev)
-{
-	mddev->suspended = 0;
-	wake_up(&mddev->sb_wait);
-	mddev->pers->quiesce(mddev, 0);
-
-	md_wakeup_thread(mddev->thread);
-	md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
-}
-EXPORT_SYMBOL_GPL(mddev_resume);
-
-int mddev_congested(struct mddev *mddev, int bits)
-{
-	return mddev->suspended;
-}
-EXPORT_SYMBOL(mddev_congested);
-
-/*
- * Generic flush handling for md
- */
-
-static void md_end_flush(struct bio *bio, int err)
-{
-	struct md_rdev *rdev = bio->bi_private;
-	struct mddev *mddev = rdev->mddev;
-
-	rdev_dec_pending(rdev, mddev);
-
-	if (atomic_dec_and_test(&mddev->flush_pending)) {
-		/* The pre-request flush has finished */
-		queue_work(md_wq, &mddev->flush_work);
-	}
-	bio_put(bio);
-}
-
-static void md_submit_flush_data(struct work_struct *ws);
-
-static void submit_flushes(struct work_struct *ws)
-{
-	struct mddev *mddev = container_of(ws, struct mddev, flush_work);
-	struct md_rdev *rdev;
-
-	INIT_WORK(&mddev->flush_work, md_submit_flush_data);
-	atomic_set(&mddev->flush_pending, 1);
-	rcu_read_lock();
-	rdev_for_each_rcu(rdev, mddev)
-		if (rdev->raid_disk >= 0 &&
-		    !test_bit(Faulty, &rdev->flags)) {
-			/* Take two references, one is dropped
-			 * when request finishes, one after
-			 * we reclaim rcu_read_lock
-			 */
-			struct bio *bi;
-			atomic_inc(&rdev->nr_pending);
-			atomic_inc(&rdev->nr_pending);
-			rcu_read_unlock();
-			bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
-			bi->bi_end_io = md_end_flush;
-			bi->bi_private = rdev;
-			bi->bi_bdev = rdev->bdev;
-			atomic_inc(&mddev->flush_pending);
-			submit_bio(WRITE_FLUSH, bi);
-			rcu_read_lock();
-			rdev_dec_pending(rdev, mddev);
-		}
-	rcu_read_unlock();
-	if (atomic_dec_and_test(&mddev->flush_pending))
-		queue_work(md_wq, &mddev->flush_work);
-}
-
-static void md_submit_flush_data(struct work_struct *ws)
-{
-	struct mddev *mddev = container_of(ws, struct mddev, flush_work);
-	struct bio *bio = mddev->flush_bio;
-
-	if (bio->bi_size == 0)
-		/* an empty barrier - all done */
-		bio_endio(bio, 0);
-	else {
-		bio->bi_rw &= ~REQ_FLUSH;
-		mddev->pers->make_request(mddev, bio);
-	}
-
-	mddev->flush_bio = NULL;
-	wake_up(&mddev->sb_wait);
-}
-
-void md_flush_request(struct mddev *mddev, struct bio *bio)
-{
-	spin_lock_irq(&mddev->write_lock);
-	wait_event_lock_irq(mddev->sb_wait,
-			    !mddev->flush_bio,
-			    mddev->write_lock, /*nothing*/);
-	mddev->flush_bio = bio;
-	spin_unlock_irq(&mddev->write_lock);
-
-	INIT_WORK(&mddev->flush_work, submit_flushes);
-	queue_work(md_wq, &mddev->flush_work);
-}
-EXPORT_SYMBOL(md_flush_request);
-
-/* Support for plugging.
- * This mirrors the plugging support in request_queue, but does not
- * require having a whole queue or request structures.
- * We allocate an md_plug_cb for each md device and each thread it gets
- * plugged on.  This links tot the private plug_handle structure in the
- * personality data where we keep a count of the number of outstanding
- * plugs so other code can see if a plug is active.
- */
-struct md_plug_cb {
-	struct blk_plug_cb cb;
-	struct mddev *mddev;
-};
-
-static void plugger_unplug(struct blk_plug_cb *cb)
-{
-	struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb);
-	if (atomic_dec_and_test(&mdcb->mddev->plug_cnt))
-		md_wakeup_thread(mdcb->mddev->thread);
-	kfree(mdcb);
-}
-
-/* Check that an unplug wakeup will come shortly.
- * If not, wakeup the md thread immediately
- */
-int mddev_check_plugged(struct mddev *mddev)
-{
-	struct blk_plug *plug = current->plug;
-	struct md_plug_cb *mdcb;
-
-	if (!plug)
-		return 0;
-
-	list_for_each_entry(mdcb, &plug->cb_list, cb.list) {
-		if (mdcb->cb.callback == plugger_unplug &&
-		    mdcb->mddev == mddev) {
-			/* Already on the list, move to top */
-			if (mdcb != list_first_entry(&plug->cb_list,
-						    struct md_plug_cb,
-						    cb.list))
-				list_move(&mdcb->cb.list, &plug->cb_list);
-			return 1;
-		}
-	}
-	/* Not currently on the callback list */
-	mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC);
-	if (!mdcb)
-		return 0;
-
-	mdcb->mddev = mddev;
-	mdcb->cb.callback = plugger_unplug;
-	atomic_inc(&mddev->plug_cnt);
-	list_add(&mdcb->cb.list, &plug->cb_list);
-	return 1;
-}
-EXPORT_SYMBOL_GPL(mddev_check_plugged);
-
-static inline struct mddev *mddev_get(struct mddev *mddev)
-{
-	atomic_inc(&mddev->active);
-	return mddev;
-}
-
-static void mddev_delayed_delete(struct work_struct *ws);
-
-static void mddev_put(struct mddev *mddev)
-{
-	struct bio_set *bs = NULL;
-
-	if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
-		return;
-	if (!mddev->raid_disks && list_empty(&mddev->disks) &&
-	    mddev->ctime == 0 && !mddev->hold_active) {
-		/* Array is not configured at all, and not held active,
-		 * so destroy it */
-		list_del_init(&mddev->all_mddevs);
-		bs = mddev->bio_set;
-		mddev->bio_set = NULL;
-		if (mddev->gendisk) {
-			/* We did a probe so need to clean up.  Call
-			 * queue_work inside the spinlock so that
-			 * flush_workqueue() after mddev_find will
-			 * succeed in waiting for the work to be done.
-			 */
-			INIT_WORK(&mddev->del_work, mddev_delayed_delete);
-			queue_work(md_misc_wq, &mddev->del_work);
-		} else
-			kfree(mddev);
-	}
-	spin_unlock(&all_mddevs_lock);
-	if (bs)
-		bioset_free(bs);
-}
-
-void mddev_init(struct mddev *mddev)
-{
-	mutex_init(&mddev->open_mutex);
-	mutex_init(&mddev->reconfig_mutex);
-	mutex_init(&mddev->bitmap_info.mutex);
-	INIT_LIST_HEAD(&mddev->disks);
-	INIT_LIST_HEAD(&mddev->all_mddevs);
-	init_timer(&mddev->safemode_timer);
-	atomic_set(&mddev->active, 1);
-	atomic_set(&mddev->openers, 0);
-	atomic_set(&mddev->active_io, 0);
-	atomic_set(&mddev->plug_cnt, 0);
-	spin_lock_init(&mddev->write_lock);
-	atomic_set(&mddev->flush_pending, 0);
-	init_waitqueue_head(&mddev->sb_wait);
-	init_waitqueue_head(&mddev->recovery_wait);
-	mddev->reshape_position = MaxSector;
-	mddev->resync_min = 0;
-	mddev->resync_max = MaxSector;
-	mddev->level = LEVEL_NONE;
-}
-EXPORT_SYMBOL_GPL(mddev_init);
-
-static struct mddev * mddev_find(dev_t unit)
-{
-	struct mddev *mddev, *new = NULL;
-
-	if (unit && MAJOR(unit) != MD_MAJOR)
-		unit &= ~((1<<MdpMinorShift)-1);
-
- retry:
-	spin_lock(&all_mddevs_lock);
-
-	if (unit) {
-		list_for_each_entry(mddev, &all_mddevs, all_mddevs)
-			if (mddev->unit == unit) {
-				mddev_get(mddev);
-				spin_unlock(&all_mddevs_lock);
-				kfree(new);
-				return mddev;
-			}
-
-		if (new) {
-			list_add(&new->all_mddevs, &all_mddevs);
-			spin_unlock(&all_mddevs_lock);
-			new->hold_active = UNTIL_IOCTL;
-			return new;
-		}
-	} else if (new) {
-		/* find an unused unit number */
-		static int next_minor = 512;
-		int start = next_minor;
-		int is_free = 0;
-		int dev = 0;
-		while (!is_free) {
-			dev = MKDEV(MD_MAJOR, next_minor);
-			next_minor++;
-			if (next_minor > MINORMASK)
-				next_minor = 0;
-			if (next_minor == start) {
-				/* Oh dear, all in use. */
-				spin_unlock(&all_mddevs_lock);
-				kfree(new);
-				return NULL;
-			}
-				
-			is_free = 1;
-			list_for_each_entry(mddev, &all_mddevs, all_mddevs)
-				if (mddev->unit == dev) {
-					is_free = 0;
-					break;
-				}
-		}
-		new->unit = dev;
-		new->md_minor = MINOR(dev);
-		new->hold_active = UNTIL_STOP;
-		list_add(&new->all_mddevs, &all_mddevs);
-		spin_unlock(&all_mddevs_lock);
-		return new;
-	}
-	spin_unlock(&all_mddevs_lock);
-
-	new = kzalloc(sizeof(*new), GFP_KERNEL);
-	if (!new)
-		return NULL;
-
-	new->unit = unit;
-	if (MAJOR(unit) == MD_MAJOR)
-		new->md_minor = MINOR(unit);
-	else
-		new->md_minor = MINOR(unit) >> MdpMinorShift;
-
-	mddev_init(new);
-
-	goto retry;
-}
-
-static inline int mddev_lock(struct mddev * mddev)
-{
-	return mutex_lock_interruptible(&mddev->reconfig_mutex);
-}
-
-static inline int mddev_is_locked(struct mddev *mddev)
-{
-	return mutex_is_locked(&mddev->reconfig_mutex);
-}
-
-static inline int mddev_trylock(struct mddev * mddev)
-{
-	return mutex_trylock(&mddev->reconfig_mutex);
-}
-
-static struct attribute_group md_redundancy_group;
-
-static void mddev_unlock(struct mddev * mddev)
-{
-	if (mddev->to_remove) {
-		/* These cannot be removed under reconfig_mutex as
-		 * an access to the files will try to take reconfig_mutex
-		 * while holding the file unremovable, which leads to
-		 * a deadlock.
-		 * So hold set sysfs_active while the remove in happeing,
-		 * and anything else which might set ->to_remove or my
-		 * otherwise change the sysfs namespace will fail with
-		 * -EBUSY if sysfs_active is still set.
-		 * We set sysfs_active under reconfig_mutex and elsewhere
-		 * test it under the same mutex to ensure its correct value
-		 * is seen.
-		 */
-		struct attribute_group *to_remove = mddev->to_remove;
-		mddev->to_remove = NULL;
-		mddev->sysfs_active = 1;
-		mutex_unlock(&mddev->reconfig_mutex);
-
-		if (mddev->kobj.sd) {
-			if (to_remove != &md_redundancy_group)
-				sysfs_remove_group(&mddev->kobj, to_remove);
-			if (mddev->pers == NULL ||
-			    mddev->pers->sync_request == NULL) {
-				sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
-				if (mddev->sysfs_action)
-					sysfs_put(mddev->sysfs_action);
-				mddev->sysfs_action = NULL;
-			}
-		}
-		mddev->sysfs_active = 0;
-	} else
-		mutex_unlock(&mddev->reconfig_mutex);
-
-	/* As we've dropped the mutex we need a spinlock to
-	 * make sure the thread doesn't disappear
-	 */
-	spin_lock(&pers_lock);
-	md_wakeup_thread(mddev->thread);
-	spin_unlock(&pers_lock);
-}
-
-static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr)
-{
-	struct md_rdev *rdev;
-
-	rdev_for_each(rdev, mddev)
-		if (rdev->desc_nr == nr)
-			return rdev;
-
-	return NULL;
-}
-
-static struct md_rdev * find_rdev(struct mddev * mddev, dev_t dev)
-{
-	struct md_rdev *rdev;
-
-	rdev_for_each(rdev, mddev)
-		if (rdev->bdev->bd_dev == dev)
-			return rdev;
-
-	return NULL;
-}
-
-static struct md_personality *find_pers(int level, char *clevel)
-{
-	struct md_personality *pers;
-	list_for_each_entry(pers, &pers_list, list) {
-		if (level != LEVEL_NONE && pers->level == level)
-			return pers;
-		if (strcmp(pers->name, clevel)==0)
-			return pers;
-	}
-	return NULL;
-}
-
-/* return the offset of the super block in 512byte sectors */
-static inline sector_t calc_dev_sboffset(struct md_rdev *rdev)
-{
-	sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512;
-	return MD_NEW_SIZE_SECTORS(num_sectors);
-}
-
-static int alloc_disk_sb(struct md_rdev * 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 -ENOMEM;
-	}
-
-	return 0;
-}
-
-static void free_disk_sb(struct md_rdev * rdev)
-{
-	if (rdev->sb_page) {
-		put_page(rdev->sb_page);
-		rdev->sb_loaded = 0;
-		rdev->sb_page = NULL;
-		rdev->sb_start = 0;
-		rdev->sectors = 0;
-	}
-	if (rdev->bb_page) {
-		put_page(rdev->bb_page);
-		rdev->bb_page = NULL;
-	}
-}
-
-
-static void super_written(struct bio *bio, int error)
-{
-	struct md_rdev *rdev = bio->bi_private;
-	struct mddev *mddev = rdev->mddev;
-
-	if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
-		printk("md: super_written gets error=%d, uptodate=%d\n",
-		       error, test_bit(BIO_UPTODATE, &bio->bi_flags));
-		WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
-		md_error(mddev, rdev);
-	}
-
-	if (atomic_dec_and_test(&mddev->pending_writes))
-		wake_up(&mddev->sb_wait);
-	bio_put(bio);
-}
-
-void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
-		   sector_t sector, int size, struct page *page)
-{
-	/* write first size bytes of page to sector of rdev
-	 * Increment mddev->pending_writes before returning
-	 * and decrement it on completion, waking up sb_wait
-	 * if zero is reached.
-	 * If an error occurred, call md_error
-	 */
-	struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev);
-
-	bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev;
-	bio->bi_sector = sector;
-	bio_add_page(bio, page, size, 0);
-	bio->bi_private = rdev;
-	bio->bi_end_io = super_written;
-
-	atomic_inc(&mddev->pending_writes);
-	submit_bio(WRITE_FLUSH_FUA, bio);
-}
-
-void md_super_wait(struct mddev *mddev)
-{
-	/* wait for all superblock writes that were scheduled to complete */
-	DEFINE_WAIT(wq);
-	for(;;) {
-		prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
-		if (atomic_read(&mddev->pending_writes)==0)
-			break;
-		schedule();
-	}
-	finish_wait(&mddev->sb_wait, &wq);
-}
-
-static void bi_complete(struct bio *bio, int error)
-{
-	complete((struct completion*)bio->bi_private);
-}
-
-int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
-		 struct page *page, int rw, bool metadata_op)
-{
-	struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev);
-	struct completion event;
-	int ret;
-
-	rw |= REQ_SYNC;
-
-	bio->bi_bdev = (metadata_op && rdev->meta_bdev) ?
-		rdev->meta_bdev : rdev->bdev;
-	if (metadata_op)
-		bio->bi_sector = sector + rdev->sb_start;
-	else
-		bio->bi_sector = sector + rdev->data_offset;
-	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;
-}
-EXPORT_SYMBOL_GPL(sync_page_io);
-
-static int read_disk_sb(struct md_rdev * rdev, int size)
-{
-	char b[BDEVNAME_SIZE];
-	if (!rdev->sb_page) {
-		MD_BUG();
-		return -EINVAL;
-	}
-	if (rdev->sb_loaded)
-		return 0;
-
-
-	if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true))
-		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)
-{
-	return 	sb1->set_uuid0 == sb2->set_uuid0 &&
-		sb1->set_uuid1 == sb2->set_uuid1 &&
-		sb1->set_uuid2 == sb2->set_uuid2 &&
-		sb1->set_uuid3 == sb2->set_uuid3;
-}
-
-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 sb_equal(): failed to allocate memory!\n");
-		goto abort;
-	}
-
-	*tmp1 = *sb1;
-	*tmp2 = *sb2;
-
-	/*
-	 * nr_disks is not constant
-	 */
-	tmp1->nr_disks = 0;
-	tmp2->nr_disks = 0;
-
-	ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
-abort:
-	kfree(tmp1);
-	kfree(tmp2);
-	return ret;
-}
-
-
-static u32 md_csum_fold(u32 csum)
-{
-	csum = (csum & 0xffff) + (csum >> 16);
-	return (csum & 0xffff) + (csum >> 16);
-}
-
-static unsigned int calc_sb_csum(mdp_super_t * sb)
-{
-	u64 newcsum = 0;
-	u32 *sb32 = (u32*)sb;
-	int i;
-	unsigned int disk_csum, csum;
-
-	disk_csum = sb->sb_csum;
-	sb->sb_csum = 0;
-
-	for (i = 0; i < MD_SB_BYTES/4 ; i++)
-		newcsum += sb32[i];
-	csum = (newcsum & 0xffffffff) + (newcsum>>32);
-
-
-#ifdef CONFIG_ALPHA
-	/* This used to use csum_partial, which was wrong for several
-	 * reasons including that different results are returned on
-	 * different architectures.  It isn't critical that we get exactly
-	 * the same return value as before (we always csum_fold before
-	 * testing, and that removes any differences).  However as we
-	 * know that csum_partial always returned a 16bit value on
-	 * alphas, do a fold to maximise conformity to previous behaviour.
-	 */
-	sb->sb_csum = md_csum_fold(disk_csum);
-#else
-	sb->sb_csum = disk_csum;
-#endif
-	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(struct md_rdev *dev, struct md_rdev *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(struct mddev *mddev, struct md_rdev *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(struct mddev *mddev, struct md_rdev *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)(struct md_rdev *rdev, struct md_rdev *refdev,
-					  int minor_version);
-	int		    (*validate_super)(struct mddev *mddev, struct md_rdev *rdev);
-	void		    (*sync_super)(struct mddev *mddev, struct md_rdev *rdev);
-	unsigned long long  (*rdev_size_change)(struct md_rdev *rdev,
-						sector_t num_sectors);
-};
-
-/*
- * Check that the given mddev has no bitmap.
- *
- * This function is called from the run method of all personalities that do not
- * support bitmaps. It prints an error message and returns non-zero if mddev
- * has a bitmap. Otherwise, it returns 0.
- *
- */
-int md_check_no_bitmap(struct mddev *mddev)
-{
-	if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)
-		return 0;
-	printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
-		mdname(mddev), mddev->pers->name);
-	return 1;
-}
-EXPORT_SYMBOL(md_check_no_bitmap);
-
-/*
- * load_super for 0.90.0 
- */
-static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
-{
-	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
-	mdp_super_t *sb;
-	int ret;
-
-	/*
-	 * Calculate the position of the superblock (512byte sectors),
-	 * it's at the end of the disk.
-	 *
-	 * It also happens to be a multiple of 4Kb.
-	 */
-	rdev->sb_start = calc_dev_sboffset(rdev);
-
-	ret = read_disk_sb(rdev, MD_SB_BYTES);
-	if (ret) return ret;
-
-	ret = -EINVAL;
-
-	bdevname(rdev->bdev, b);
-	sb = 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 ||
-	    sb->minor_version > 91) {
-		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 (md_csum_fold(calc_sb_csum(sb)) != md_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;
-	rdev->sb_size = MD_SB_BYTES;
-	rdev->badblocks.shift = -1;
-
-	if (sb->level == LEVEL_MULTIPATH)
-		rdev->desc_nr = -1;
-	else
-		rdev->desc_nr = sb->this_disk.number;
-
-	if (!refdev) {
-		ret = 1;
-	} else {
-		__u64 ev1, ev2;
-		mdp_super_t *refsb = 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->sectors = rdev->sb_start;
-	/* Limit to 4TB as metadata cannot record more than that */
-	if (rdev->sectors >= (2ULL << 32))
-		rdev->sectors = (2ULL << 32) - 2;
-
-	if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1)
-		/* "this cannot possibly happen" ... */
-		ret = -EINVAL;
-
- abort:
-	return ret;
-}
-
-/*
- * validate_super for 0.90.0
- */
-static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev)
-{
-	mdp_disk_t *desc;
-	mdp_super_t *sb = page_address(rdev->sb_page);
-	__u64 ev1 = md_event(sb);
-
-	rdev->raid_disk = -1;
-	clear_bit(Faulty, &rdev->flags);
-	clear_bit(In_sync, &rdev->flags);
-	clear_bit(WriteMostly, &rdev->flags);
-
-	if (mddev->raid_disks == 0) {
-		mddev->major_version = 0;
-		mddev->minor_version = sb->minor_version;
-		mddev->patch_version = sb->patch_version;
-		mddev->external = 0;
-		mddev->chunk_sectors = sb->chunk_size >> 9;
-		mddev->ctime = sb->ctime;
-		mddev->utime = sb->utime;
-		mddev->level = sb->level;
-		mddev->clevel[0] = 0;
-		mddev->layout = sb->layout;
-		mddev->raid_disks = sb->raid_disks;
-		mddev->dev_sectors = ((sector_t)sb->size) * 2;
-		mddev->events = ev1;
-		mddev->bitmap_info.offset = 0;
-		mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
-
-		if (mddev->minor_version >= 91) {
-			mddev->reshape_position = sb->reshape_position;
-			mddev->delta_disks = sb->delta_disks;
-			mddev->new_level = sb->new_level;
-			mddev->new_layout = sb->new_layout;
-			mddev->new_chunk_sectors = sb->new_chunk >> 9;
-		} else {
-			mddev->reshape_position = MaxSector;
-			mddev->delta_disks = 0;
-			mddev->new_level = mddev->level;
-			mddev->new_layout = mddev->layout;
-			mddev->new_chunk_sectors = mddev->chunk_sectors;
-		}
-
-		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;
-
-		if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
-		    mddev->bitmap_info.file == NULL)
-			mddev->bitmap_info.offset =
-				mddev->bitmap_info.default_offset;
-
-	} else if (mddev->pers == NULL) {
-		/* Insist on good event counter while assembling, except
-		 * for spares (which don't need an event count) */
-		++ev1;
-		if (sb->disks[rdev->desc_nr].state & (
-			    (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))
-			if (ev1 < mddev->events) 
-				return -EINVAL;
-	} else if (mddev->bitmap) {
-		/* if adding to array with a bitmap, then we can accept an
-		 * older device ... but not too old.
-		 */
-		if (ev1 < mddev->bitmap->events_cleared)
-			return 0;
-	} else {
-		if (ev1 < mddev->events)
-			/* just a hot-add of a new device, leave raid_disk at -1 */
-			return 0;
-	}
-
-	if (mddev->level != LEVEL_MULTIPATH) {
-		desc = sb->disks + rdev->desc_nr;
-
-		if (desc->state & (1<<MD_DISK_FAULTY))
-			set_bit(Faulty, &rdev->flags);
-		else if (desc->state & (1<<MD_DISK_SYNC) /* &&
-			    desc->raid_disk < mddev->raid_disks */) {
-			set_bit(In_sync, &rdev->flags);
-			rdev->raid_disk = desc->raid_disk;
-		} else if (desc->state & (1<<MD_DISK_ACTIVE)) {
-			/* active but not in sync implies recovery up to
-			 * reshape position.  We don't know exactly where
-			 * that is, so set to zero for now */
-			if (mddev->minor_version >= 91) {
-				rdev->recovery_offset = 0;
-				rdev->raid_disk = desc->raid_disk;
-			}
-		}
-		if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
-			set_bit(WriteMostly, &rdev->flags);
-	} else /* MULTIPATH are always insync */
-		set_bit(In_sync, &rdev->flags);
-	return 0;
-}
-
-/*
- * sync_super for 0.90.0
- */
-static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev)
-{
-	mdp_super_t *sb;
-	struct md_rdev *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;
-
-	rdev->sb_size = MD_SB_BYTES;
-
-	sb = page_address(rdev->sb_page);
-
-	memset(sb, 0, sizeof(*sb));
-
-	sb->md_magic = MD_SB_MAGIC;
-	sb->major_version = mddev->major_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->dev_sectors / 2;
-	sb->raid_disks = mddev->raid_disks;
-	sb->md_minor = mddev->md_minor;
-	sb->not_persistent = 0;
-	sb->utime = mddev->utime;
-	sb->state = 0;
-	sb->events_hi = (mddev->events>>32);
-	sb->events_lo = (u32)mddev->events;
-
-	if (mddev->reshape_position == MaxSector)
-		sb->minor_version = 90;
-	else {
-		sb->minor_version = 91;
-		sb->reshape_position = mddev->reshape_position;
-		sb->new_level = mddev->new_level;
-		sb->delta_disks = mddev->delta_disks;
-		sb->new_layout = mddev->new_layout;
-		sb->new_chunk = mddev->new_chunk_sectors << 9;
-	}
-	mddev->minor_version = sb->minor_version;
-	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_sectors << 9;
-
-	if (mddev->bitmap && mddev->bitmap_info.file == NULL)
-		sb->state |= (1<<MD_SB_BITMAP_PRESENT);
-
-	sb->disks[0].state = (1<<MD_DISK_REMOVED);
-	rdev_for_each(rdev2, mddev) {
-		mdp_disk_t *d;
-		int desc_nr;
-		int is_active = test_bit(In_sync, &rdev2->flags);
-
-		if (rdev2->raid_disk >= 0 &&
-		    sb->minor_version >= 91)
-			/* we have nowhere to store the recovery_offset,
-			 * but if it is not below the reshape_position,
-			 * we can piggy-back on that.
-			 */
-			is_active = 1;
-		if (rdev2->raid_disk < 0 ||
-		    test_bit(Faulty, &rdev2->flags))
-			is_active = 0;
-		if (is_active)
-			desc_nr = rdev2->raid_disk;
-		else
-			desc_nr = next_spare++;
-		rdev2->desc_nr = desc_nr;
-		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 (is_active)
-			d->raid_disk = rdev2->raid_disk;
-		else
-			d->raid_disk = rdev2->desc_nr; /* compatibility */
-		if (test_bit(Faulty, &rdev2->flags))
-			d->state = (1<<MD_DISK_FAULTY);
-		else if (is_active) {
-			d->state = (1<<MD_DISK_ACTIVE);
-			if (test_bit(In_sync, &rdev2->flags))
-				d->state |= (1<<MD_DISK_SYNC);
-			active++;
-			working++;
-		} else {
-			d->state = 0;
-			spare++;
-			working++;
-		}
-		if (test_bit(WriteMostly, &rdev2->flags))
-			d->state |= (1<<MD_DISK_WRITEMOSTLY);
-	}
-	/* 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);
-}
-
-/*
- * rdev_size_change for 0.90.0
- */
-static unsigned long long
-super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
-{
-	if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
-		return 0; /* component must fit device */
-	if (rdev->mddev->bitmap_info.offset)
-		return 0; /* can't move bitmap */
-	rdev->sb_start = calc_dev_sboffset(rdev);
-	if (!num_sectors || num_sectors > rdev->sb_start)
-		num_sectors = rdev->sb_start;
-	/* Limit to 4TB as metadata cannot record more than that.
-	 * 4TB == 2^32 KB, or 2*2^32 sectors.
-	 */
-	if (num_sectors >= (2ULL << 32))
-		num_sectors = (2ULL << 32) - 2;
-	md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
-		       rdev->sb_page);
-	md_super_wait(rdev->mddev);
-	return num_sectors;
-}
-
-
-/*
- * version 1 superblock
- */
-
-static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
-{
-	__le32 disk_csum;
-	u32 csum;
-	unsigned long long newcsum;
-	int size = 256 + le32_to_cpu(sb->max_dev)*2;
-	__le32 *isuper = (__le32*)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(*(__le16*) isuper);
-
-	csum = (newcsum & 0xffffffff) + (newcsum >> 32);
-	sb->sb_csum = disk_csum;
-	return cpu_to_le32(csum);
-}
-
-static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
-			    int acknowledged);
-static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version)
-{
-	struct mdp_superblock_1 *sb;
-	int ret;
-	sector_t sb_start;
-	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
-	int bmask;
-
-	/*
-	 * Calculate the position of the superblock in 512byte sectors.
-	 * 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_start = i_size_read(rdev->bdev->bd_inode) >> 9;
-		sb_start -= 8*2;
-		sb_start &= ~(sector_t)(4*2-1);
-		break;
-	case 1:
-		sb_start = 0;
-		break;
-	case 2:
-		sb_start = 8;
-		break;
-	default:
-		return -EINVAL;
-	}
-	rdev->sb_start = sb_start;
-
-	/* superblock is rarely larger than 1K, but it can be larger,
-	 * and it is safe to read 4k, so we do that
-	 */
-	ret = read_disk_sb(rdev, 4096);
-	if (ret) return ret;
-
-
-	sb = 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_start ||
-	    (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 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);
-	atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
-
-	rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
-	bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
-	if (rdev->sb_size & bmask)
-		rdev->sb_size = (rdev->sb_size | bmask) + 1;
-
-	if (minor_version
-	    && rdev->data_offset < sb_start + (rdev->sb_size/512))
-		return -EINVAL;
-
-	if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
-		rdev->desc_nr = -1;
-	else
-		rdev->desc_nr = le32_to_cpu(sb->dev_number);
-
-	if (!rdev->bb_page) {
-		rdev->bb_page = alloc_page(GFP_KERNEL);
-		if (!rdev->bb_page)
-			return -ENOMEM;
-	}
-	if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
-	    rdev->badblocks.count == 0) {
-		/* need to load the bad block list.
-		 * Currently we limit it to one page.
-		 */
-		s32 offset;
-		sector_t bb_sector;
-		u64 *bbp;
-		int i;
-		int sectors = le16_to_cpu(sb->bblog_size);
-		if (sectors > (PAGE_SIZE / 512))
-			return -EINVAL;
-		offset = le32_to_cpu(sb->bblog_offset);
-		if (offset == 0)
-			return -EINVAL;
-		bb_sector = (long long)offset;
-		if (!sync_page_io(rdev, bb_sector, sectors << 9,
-				  rdev->bb_page, READ, true))
-			return -EIO;
-		bbp = (u64 *)page_address(rdev->bb_page);
-		rdev->badblocks.shift = sb->bblog_shift;
-		for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
-			u64 bb = le64_to_cpu(*bbp);
-			int count = bb & (0x3ff);
-			u64 sector = bb >> 10;
-			sector <<= sb->bblog_shift;
-			count <<= sb->bblog_shift;
-			if (bb + 1 == 0)
-				break;
-			if (md_set_badblocks(&rdev->badblocks,
-					     sector, count, 1) == 0)
-				return -EINVAL;
-		}
-	} else if (sb->bblog_offset == 0)
-		rdev->badblocks.shift = -1;
-
-	if (!refdev) {
-		ret = 1;
-	} else {
-		__u64 ev1, ev2;
-		struct mdp_superblock_1 *refsb = 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)
-			ret = 1;
-		else
-			ret = 0;
-	}
-	if (minor_version)
-		rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
-			le64_to_cpu(sb->data_offset);
-	else
-		rdev->sectors = rdev->sb_start;
-	if (rdev->sectors < le64_to_cpu(sb->data_size))
-		return -EINVAL;
-	rdev->sectors = le64_to_cpu(sb->data_size);
-	if (le64_to_cpu(sb->size) > rdev->sectors)
-		return -EINVAL;
-	return ret;
-}
-
-static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev)
-{
-	struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
-	__u64 ev1 = le64_to_cpu(sb->events);
-
-	rdev->raid_disk = -1;
-	clear_bit(Faulty, &rdev->flags);
-	clear_bit(In_sync, &rdev->flags);
-	clear_bit(WriteMostly, &rdev->flags);
-
-	if (mddev->raid_disks == 0) {
-		mddev->major_version = 1;
-		mddev->patch_version = 0;
-		mddev->external = 0;
-		mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
-		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->clevel[0] = 0;
-		mddev->layout = le32_to_cpu(sb->layout);
-		mddev->raid_disks = le32_to_cpu(sb->raid_disks);
-		mddev->dev_sectors = le64_to_cpu(sb->size);
-		mddev->events = ev1;
-		mddev->bitmap_info.offset = 0;
-		mddev->bitmap_info.default_offset = 1024 >> 9;
-		
-		mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
-		memcpy(mddev->uuid, sb->set_uuid, 16);
-
-		mddev->max_disks =  (4096-256)/2;
-
-		if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
-		    mddev->bitmap_info.file == NULL )
-			mddev->bitmap_info.offset =
-				(__s32)le32_to_cpu(sb->bitmap_offset);
-
-		if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
-			mddev->reshape_position = le64_to_cpu(sb->reshape_position);
-			mddev->delta_disks = le32_to_cpu(sb->delta_disks);
-			mddev->new_level = le32_to_cpu(sb->new_level);
-			mddev->new_layout = le32_to_cpu(sb->new_layout);
-			mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
-		} else {
-			mddev->reshape_position = MaxSector;
-			mddev->delta_disks = 0;
-			mddev->new_level = mddev->level;
-			mddev->new_layout = mddev->layout;
-			mddev->new_chunk_sectors = mddev->chunk_sectors;
-		}
-
-	} else if (mddev->pers == NULL) {
-		/* Insist of good event counter while assembling, except for
-		 * spares (which don't need an event count) */
-		++ev1;
-		if (rdev->desc_nr >= 0 &&
-		    rdev->desc_nr < le32_to_cpu(sb->max_dev) &&
-		    le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe)
-			if (ev1 < mddev->events)
-				return -EINVAL;
-	} else if (mddev->bitmap) {
-		/* If adding to array with a bitmap, then we can accept an
-		 * older device, but not too old.
-		 */
-		if (ev1 < mddev->bitmap->events_cleared)
-			return 0;
-	} else {
-		if (ev1 < mddev->events)
-			/* just a hot-add of a new device, leave raid_disk at -1 */
-			return 0;
-	}
-	if (mddev->level != LEVEL_MULTIPATH) {
-		int role;
-		if (rdev->desc_nr < 0 ||
-		    rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
-			role = 0xffff;
-			rdev->desc_nr = -1;
-		} else
-			role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
-		switch(role) {
-		case 0xffff: /* spare */
-			break;
-		case 0xfffe: /* faulty */
-			set_bit(Faulty, &rdev->flags);
-			break;
-		default:
-			if ((le32_to_cpu(sb->feature_map) &
-			     MD_FEATURE_RECOVERY_OFFSET))
-				rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
-			else
-				set_bit(In_sync, &rdev->flags);
-			rdev->raid_disk = role;
-			break;
-		}
-		if (sb->devflags & WriteMostly1)
-			set_bit(WriteMostly, &rdev->flags);
-		if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT)
-			set_bit(Replacement, &rdev->flags);
-	} else /* MULTIPATH are always insync */
-		set_bit(In_sync, &rdev->flags);
-
-	return 0;
-}
-
-static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
-{
-	struct mdp_superblock_1 *sb;
-	struct md_rdev *rdev2;
-	int max_dev, i;
-	/* make rdev->sb match mddev and rdev data. */
-
-	sb = page_address(rdev->sb_page);
-
-	sb->feature_map = 0;
-	sb->pad0 = 0;
-	sb->recovery_offset = cpu_to_le64(0);
-	memset(sb->pad1, 0, sizeof(sb->pad1));
-	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);
-
-	sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
-
-	sb->raid_disks = cpu_to_le32(mddev->raid_disks);
-	sb->size = cpu_to_le64(mddev->dev_sectors);
-	sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
-	sb->level = cpu_to_le32(mddev->level);
-	sb->layout = cpu_to_le32(mddev->layout);
-
-	if (test_bit(WriteMostly, &rdev->flags))
-		sb->devflags |= WriteMostly1;
-	else
-		sb->devflags &= ~WriteMostly1;
-
-	if (mddev->bitmap && mddev->bitmap_info.file == NULL) {
-		sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);
-		sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
-	}
-
-	if (rdev->raid_disk >= 0 &&
-	    !test_bit(In_sync, &rdev->flags)) {
-		sb->feature_map |=
-			cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
-		sb->recovery_offset =
-			cpu_to_le64(rdev->recovery_offset);
-	}
-	if (test_bit(Replacement, &rdev->flags))
-		sb->feature_map |=
-			cpu_to_le32(MD_FEATURE_REPLACEMENT);
-
-	if (mddev->reshape_position != MaxSector) {
-		sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
-		sb->reshape_position = cpu_to_le64(mddev->reshape_position);
-		sb->new_layout = cpu_to_le32(mddev->new_layout);
-		sb->delta_disks = cpu_to_le32(mddev->delta_disks);
-		sb->new_level = cpu_to_le32(mddev->new_level);
-		sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
-	}
-
-	if (rdev->badblocks.count == 0)
-		/* Nothing to do for bad blocks*/ ;
-	else if (sb->bblog_offset == 0)
-		/* Cannot record bad blocks on this device */
-		md_error(mddev, rdev);
-	else {
-		struct badblocks *bb = &rdev->badblocks;
-		u64 *bbp = (u64 *)page_address(rdev->bb_page);
-		u64 *p = bb->page;
-		sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
-		if (bb->changed) {
-			unsigned seq;
-
-retry:
-			seq = read_seqbegin(&bb->lock);
-
-			memset(bbp, 0xff, PAGE_SIZE);
-
-			for (i = 0 ; i < bb->count ; i++) {
-				u64 internal_bb = *p++;
-				u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
-						| BB_LEN(internal_bb));
-				*bbp++ = cpu_to_le64(store_bb);
-			}
-			bb->changed = 0;
-			if (read_seqretry(&bb->lock, seq))
-				goto retry;
-
-			bb->sector = (rdev->sb_start +
-				      (int)le32_to_cpu(sb->bblog_offset));
-			bb->size = le16_to_cpu(sb->bblog_size);
-		}
-	}
-
-	max_dev = 0;
-	rdev_for_each(rdev2, mddev)
-		if (rdev2->desc_nr+1 > max_dev)
-			max_dev = rdev2->desc_nr+1;
-
-	if (max_dev > le32_to_cpu(sb->max_dev)) {
-		int bmask;
-		sb->max_dev = cpu_to_le32(max_dev);
-		rdev->sb_size = max_dev * 2 + 256;
-		bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
-		if (rdev->sb_size & bmask)
-			rdev->sb_size = (rdev->sb_size | bmask) + 1;
-	} else
-		max_dev = le32_to_cpu(sb->max_dev);
-
-	for (i=0; i<max_dev;i++)
-		sb->dev_roles[i] = cpu_to_le16(0xfffe);
-	
-	rdev_for_each(rdev2, mddev) {
-		i = rdev2->desc_nr;
-		if (test_bit(Faulty, &rdev2->flags))
-			sb->dev_roles[i] = cpu_to_le16(0xfffe);
-		else if (test_bit(In_sync, &rdev2->flags))
-			sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
-		else if (rdev2->raid_disk >= 0)
-			sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
-		else
-			sb->dev_roles[i] = cpu_to_le16(0xffff);
-	}
-
-	sb->sb_csum = calc_sb_1_csum(sb);
-}
-
-static unsigned long long
-super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors)
-{
-	struct mdp_superblock_1 *sb;
-	sector_t max_sectors;
-	if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
-		return 0; /* component must fit device */
-	if (rdev->sb_start < rdev->data_offset) {
-		/* minor versions 1 and 2; superblock before data */
-		max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
-		max_sectors -= rdev->data_offset;
-		if (!num_sectors || num_sectors > max_sectors)
-			num_sectors = max_sectors;
-	} else if (rdev->mddev->bitmap_info.offset) {
-		/* minor version 0 with bitmap we can't move */
-		return 0;
-	} else {
-		/* minor version 0; superblock after data */
-		sector_t sb_start;
-		sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
-		sb_start &= ~(sector_t)(4*2 - 1);
-		max_sectors = rdev->sectors + sb_start - rdev->sb_start;
-		if (!num_sectors || num_sectors > max_sectors)
-			num_sectors = max_sectors;
-		rdev->sb_start = sb_start;
-	}
-	sb = page_address(rdev->sb_page);
-	sb->data_size = cpu_to_le64(num_sectors);
-	sb->super_offset = rdev->sb_start;
-	sb->sb_csum = calc_sb_1_csum(sb);
-	md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
-		       rdev->sb_page);
-	md_super_wait(rdev->mddev);
-	return num_sectors;
-}
-
-static 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,
-		.rdev_size_change   = super_90_rdev_size_change,
-	},
-	[1] = {
-		.name	= "md-1",
-		.owner	= THIS_MODULE,
-		.load_super	    = super_1_load,
-		.validate_super	    = super_1_validate,
-		.sync_super	    = super_1_sync,
-		.rdev_size_change   = super_1_rdev_size_change,
-	},
-};
-
-static void sync_super(struct mddev *mddev, struct md_rdev *rdev)
-{
-	if (mddev->sync_super) {
-		mddev->sync_super(mddev, rdev);
-		return;
-	}
-
-	BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
-
-	super_types[mddev->major_version].sync_super(mddev, rdev);
-}
-
-static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2)
-{
-	struct md_rdev *rdev, *rdev2;
-
-	rcu_read_lock();
-	rdev_for_each_rcu(rdev, mddev1)
-		rdev_for_each_rcu(rdev2, mddev2)
-			if (rdev->bdev->bd_contains ==
-			    rdev2->bdev->bd_contains) {
-				rcu_read_unlock();
-				return 1;
-			}
-	rcu_read_unlock();
-	return 0;
-}
-
-static LIST_HEAD(pending_raid_disks);
-
-/*
- * Try to register data integrity profile for an mddev
- *
- * This is called when an array is started and after a disk has been kicked
- * from the array. It only succeeds if all working and active component devices
- * are integrity capable with matching profiles.
- */
-int md_integrity_register(struct mddev *mddev)
-{
-	struct md_rdev *rdev, *reference = NULL;
-
-	if (list_empty(&mddev->disks))
-		return 0; /* nothing to do */
-	if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
-		return 0; /* shouldn't register, or already is */
-	rdev_for_each(rdev, mddev) {
-		/* skip spares and non-functional disks */
-		if (test_bit(Faulty, &rdev->flags))
-			continue;
-		if (rdev->raid_disk < 0)
-			continue;
-		if (!reference) {
-			/* Use the first rdev as the reference */
-			reference = rdev;
-			continue;
-		}
-		/* does this rdev's profile match the reference profile? */
-		if (blk_integrity_compare(reference->bdev->bd_disk,
-				rdev->bdev->bd_disk) < 0)
-			return -EINVAL;
-	}
-	if (!reference || !bdev_get_integrity(reference->bdev))
-		return 0;
-	/*
-	 * All component devices are integrity capable and have matching
-	 * profiles, register the common profile for the md device.
-	 */
-	if (blk_integrity_register(mddev->gendisk,
-			bdev_get_integrity(reference->bdev)) != 0) {
-		printk(KERN_ERR "md: failed to register integrity for %s\n",
-			mdname(mddev));
-		return -EINVAL;
-	}
-	printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev));
-	if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) {
-		printk(KERN_ERR "md: failed to create integrity pool for %s\n",
-		       mdname(mddev));
-		return -EINVAL;
-	}
-	return 0;
-}
-EXPORT_SYMBOL(md_integrity_register);
-
-/* Disable data integrity if non-capable/non-matching disk is being added */
-void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
-{
-	struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
-	struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
-
-	if (!bi_mddev) /* nothing to do */
-		return;
-	if (rdev->raid_disk < 0) /* skip spares */
-		return;
-	if (bi_rdev && blk_integrity_compare(mddev->gendisk,
-					     rdev->bdev->bd_disk) >= 0)
-		return;
-	printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
-	blk_integrity_unregister(mddev->gendisk);
-}
-EXPORT_SYMBOL(md_integrity_add_rdev);
-
-static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev)
-{
-	char b[BDEVNAME_SIZE];
-	struct kobject *ko;
-	char *s;
-	int err;
-
-	if (rdev->mddev) {
-		MD_BUG();
-		return -EINVAL;
-	}
-
-	/* prevent duplicates */
-	if (find_rdev(mddev, rdev->bdev->bd_dev))
-		return -EEXIST;
-
-	/* make sure rdev->sectors exceeds mddev->dev_sectors */
-	if (rdev->sectors && (mddev->dev_sectors == 0 ||
-			rdev->sectors < mddev->dev_sectors)) {
-		if (mddev->pers) {
-			/* Cannot change size, so fail
-			 * If mddev->level <= 0, then we don't care
-			 * about aligning sizes (e.g. linear)
-			 */
-			if (mddev->level > 0)
-				return -ENOSPC;
-		} else
-			mddev->dev_sectors = rdev->sectors;
-	}
-
-	/* 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;
-	}
-	if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
-		printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
-		       mdname(mddev), mddev->max_disks);
-		return -EBUSY;
-	}
-	bdevname(rdev->bdev,b);
-	while ( (s=strchr(b, '/')) != NULL)
-		*s = '!';
-
-	rdev->mddev = mddev;
-	printk(KERN_INFO "md: bind<%s>\n", b);
-
-	if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
-		goto fail;
-
-	ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
-	if (sysfs_create_link(&rdev->kobj, ko, "block"))
-		/* failure here is OK */;
-	rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
-
-	list_add_rcu(&rdev->same_set, &mddev->disks);
-	bd_link_disk_holder(rdev->bdev, mddev->gendisk);
-
-	/* May as well allow recovery to be retried once */
-	mddev->recovery_disabled++;
-
-	return 0;
-
- fail:
-	printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
-	       b, mdname(mddev));
-	return err;
-}
-
-static void md_delayed_delete(struct work_struct *ws)
-{
-	struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work);
-	kobject_del(&rdev->kobj);
-	kobject_put(&rdev->kobj);
-}
-
-static void unbind_rdev_from_array(struct md_rdev * rdev)
-{
-	char b[BDEVNAME_SIZE];
-	if (!rdev->mddev) {
-		MD_BUG();
-		return;
-	}
-	bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk);
-	list_del_rcu(&rdev->same_set);
-	printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
-	rdev->mddev = NULL;
-	sysfs_remove_link(&rdev->kobj, "block");
-	sysfs_put(rdev->sysfs_state);
-	rdev->sysfs_state = NULL;
-	kfree(rdev->badblocks.page);
-	rdev->badblocks.count = 0;
-	rdev->badblocks.page = NULL;
-	/* We need to delay this, otherwise we can deadlock when
-	 * writing to 'remove' to "dev/state".  We also need
-	 * to delay it due to rcu usage.
-	 */
-	synchronize_rcu();
-	INIT_WORK(&rdev->del_work, md_delayed_delete);
-	kobject_get(&rdev->kobj);
-	queue_work(md_misc_wq, &rdev->del_work);
-}
-
-/*
- * 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(struct md_rdev *rdev, dev_t dev, int shared)
-{
-	int err = 0;
-	struct block_device *bdev;
-	char b[BDEVNAME_SIZE];
-
-	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
-				 shared ? (struct md_rdev *)lock_rdev : rdev);
-	if (IS_ERR(bdev)) {
-		printk(KERN_ERR "md: could not open %s.\n",
-			__bdevname(dev, b));
-		return PTR_ERR(bdev);
-	}
-	rdev->bdev = bdev;
-	return err;
-}
-
-static void unlock_rdev(struct md_rdev *rdev)
-{
-	struct block_device *bdev = rdev->bdev;
-	rdev->bdev = NULL;
-	if (!bdev)
-		MD_BUG();
-	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
-}
-
-void md_autodetect_dev(dev_t dev);
-
-static void export_rdev(struct md_rdev * 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);
-#ifndef MODULE
-	if (test_bit(AutoDetected, &rdev->flags))
-		md_autodetect_dev(rdev->bdev->bd_dev);
-#endif
-	unlock_rdev(rdev);
-	kobject_put(&rdev->kobj);
-}
-
-static void kick_rdev_from_array(struct md_rdev * rdev)
-{
-	unbind_rdev_from_array(rdev);
-	export_rdev(rdev);
-}
-
-static void export_array(struct mddev *mddev)
-{
-	struct md_rdev *rdev, *tmp;
-
-	rdev_for_each_safe(rdev, tmp, mddev) {
-		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_90(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_sb_1(struct mdp_superblock_1 *sb)
-{
-	__u8 *uuid;
-
-	uuid = sb->set_uuid;
-	printk(KERN_INFO
-	       "md:  SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
-	       "md:    Name: \"%s\" CT:%llu\n",
-		le32_to_cpu(sb->major_version),
-		le32_to_cpu(sb->feature_map),
-		uuid,
-		sb->set_name,
-		(unsigned long long)le64_to_cpu(sb->ctime)
-		       & MD_SUPERBLOCK_1_TIME_SEC_MASK);
-
-	uuid = sb->device_uuid;
-	printk(KERN_INFO
-	       "md:       L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
-			" RO:%llu\n"
-	       "md:     Dev:%08x UUID: %pU\n"
-	       "md:       (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
-	       "md:         (MaxDev:%u) \n",
-		le32_to_cpu(sb->level),
-		(unsigned long long)le64_to_cpu(sb->size),
-		le32_to_cpu(sb->raid_disks),
-		le32_to_cpu(sb->layout),
-		le32_to_cpu(sb->chunksize),
-		(unsigned long long)le64_to_cpu(sb->data_offset),
-		(unsigned long long)le64_to_cpu(sb->data_size),
-		(unsigned long long)le64_to_cpu(sb->super_offset),
-		(unsigned long long)le64_to_cpu(sb->recovery_offset),
-		le32_to_cpu(sb->dev_number),
-		uuid,
-		sb->devflags,
-		(unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
-		(unsigned long long)le64_to_cpu(sb->events),
-		(unsigned long long)le64_to_cpu(sb->resync_offset),
-		le32_to_cpu(sb->sb_csum),
-		le32_to_cpu(sb->max_dev)
-		);
-}
-
-static void print_rdev(struct md_rdev *rdev, int major_version)
-{
-	char b[BDEVNAME_SIZE];
-	printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
-		bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
-	        test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
-	        rdev->desc_nr);
-	if (rdev->sb_loaded) {
-		printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
-		switch (major_version) {
-		case 0:
-			print_sb_90(page_address(rdev->sb_page));
-			break;
-		case 1:
-			print_sb_1(page_address(rdev->sb_page));
-			break;
-		}
-	} else
-		printk(KERN_INFO "md: no rdev superblock!\n");
-}
-
-static void md_print_devices(void)
-{
-	struct list_head *tmp;
-	struct md_rdev *rdev;
-	struct mddev *mddev;
-	char b[BDEVNAME_SIZE];
-
-	printk("\n");
-	printk("md:	**********************************\n");
-	printk("md:	* <COMPLETE RAID STATE PRINTOUT> *\n");
-	printk("md:	**********************************\n");
-	for_each_mddev(mddev, tmp) {
-
-		if (mddev->bitmap)
-			bitmap_print_sb(mddev->bitmap);
-		else
-			printk("%s: ", mdname(mddev));
-		rdev_for_each(rdev, mddev)
-			printk("<%s>", bdevname(rdev->bdev,b));
-		printk("\n");
-
-		rdev_for_each(rdev, mddev)
-			print_rdev(rdev, mddev->major_version);
-	}
-	printk("md:	**********************************\n");
-	printk("\n");
-}
-
-
-static void sync_sbs(struct mddev * mddev, int nospares)
-{
-	/* Update each superblock (in-memory image), but
-	 * if we are allowed to, skip spares which already
-	 * have the right event counter, or have one earlier
-	 * (which would mean they aren't being marked as dirty
-	 * with the rest of the array)
-	 */
-	struct md_rdev *rdev;
-	rdev_for_each(rdev, mddev) {
-		if (rdev->sb_events == mddev->events ||
-		    (nospares &&
-		     rdev->raid_disk < 0 &&
-		     rdev->sb_events+1 == mddev->events)) {
-			/* Don't update this superblock */
-			rdev->sb_loaded = 2;
-		} else {
-			sync_super(mddev, rdev);
-			rdev->sb_loaded = 1;
-		}
-	}
-}
-
-static void md_update_sb(struct mddev * mddev, int force_change)
-{
-	struct md_rdev *rdev;
-	int sync_req;
-	int nospares = 0;
-	int any_badblocks_changed = 0;
-
-repeat:
-	/* First make sure individual recovery_offsets are correct */
-	rdev_for_each(rdev, mddev) {
-		if (rdev->raid_disk >= 0 &&
-		    mddev->delta_disks >= 0 &&
-		    !test_bit(In_sync, &rdev->flags) &&
-		    mddev->curr_resync_completed > rdev->recovery_offset)
-				rdev->recovery_offset = mddev->curr_resync_completed;
-
-	}	
-	if (!mddev->persistent) {
-		clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
-		clear_bit(MD_CHANGE_DEVS, &mddev->flags);
-		if (!mddev->external) {
-			clear_bit(MD_CHANGE_PENDING, &mddev->flags);
-			rdev_for_each(rdev, mddev) {
-				if (rdev->badblocks.changed) {
-					rdev->badblocks.changed = 0;
-					md_ack_all_badblocks(&rdev->badblocks);
-					md_error(mddev, rdev);
-				}
-				clear_bit(Blocked, &rdev->flags);
-				clear_bit(BlockedBadBlocks, &rdev->flags);
-				wake_up(&rdev->blocked_wait);
-			}
-		}
-		wake_up(&mddev->sb_wait);
-		return;
-	}
-
-	spin_lock_irq(&mddev->write_lock);
-
-	mddev->utime = get_seconds();
-
-	if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
-		force_change = 1;
-	if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
-		/* just a clean<-> dirty transition, possibly leave spares alone,
-		 * though if events isn't the right even/odd, we will have to do
-		 * spares after all
-		 */
-		nospares = 1;
-	if (force_change)
-		nospares = 0;
-	if (mddev->degraded)
-		/* If the array is degraded, then skipping spares is both
-		 * dangerous and fairly pointless.
-		 * Dangerous because a device that was removed from the array
-		 * might have a event_count that still looks up-to-date,
-		 * so it can be re-added without a resync.
-		 * Pointless because if there are any spares to skip,
-		 * then a recovery will happen and soon that array won't
-		 * be degraded any more and the spare can go back to sleep then.
-		 */
-		nospares = 0;
-
-	sync_req = mddev->in_sync;
-
-	/* If this is just a dirty<->clean transition, and the array is clean
-	 * and 'events' is odd, we can roll back to the previous clean state */
-	if (nospares
-	    && (mddev->in_sync && mddev->recovery_cp == MaxSector)
-	    && mddev->can_decrease_events
-	    && mddev->events != 1) {
-		mddev->events--;
-		mddev->can_decrease_events = 0;
-	} else {
-		/* otherwise we have to go forward and ... */
-		mddev->events ++;
-		mddev->can_decrease_events = nospares;
-	}
-
-	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 --;
-	}
-
-	rdev_for_each(rdev, mddev) {
-		if (rdev->badblocks.changed)
-			any_badblocks_changed++;
-		if (test_bit(Faulty, &rdev->flags))
-			set_bit(FaultRecorded, &rdev->flags);
-	}
-
-	sync_sbs(mddev, nospares);
-	spin_unlock_irq(&mddev->write_lock);
-
-	pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
-		 mdname(mddev), mddev->in_sync);
-
-	bitmap_update_sb(mddev->bitmap);
-	rdev_for_each(rdev, mddev) {
-		char b[BDEVNAME_SIZE];
-
-		if (rdev->sb_loaded != 1)
-			continue; /* no noise on spare devices */
-
-		if (!test_bit(Faulty, &rdev->flags) &&
-		    rdev->saved_raid_disk == -1) {
-			md_super_write(mddev,rdev,
-				       rdev->sb_start, rdev->sb_size,
-				       rdev->sb_page);
-			pr_debug("md: (write) %s's sb offset: %llu\n",
-				 bdevname(rdev->bdev, b),
-				 (unsigned long long)rdev->sb_start);
-			rdev->sb_events = mddev->events;
-			if (rdev->badblocks.size) {
-				md_super_write(mddev, rdev,
-					       rdev->badblocks.sector,
-					       rdev->badblocks.size << 9,
-					       rdev->bb_page);
-				rdev->badblocks.size = 0;
-			}
-
-		} else if (test_bit(Faulty, &rdev->flags))
-			pr_debug("md: %s (skipping faulty)\n",
-				 bdevname(rdev->bdev, b));
-		else
-			pr_debug("(skipping incremental s/r ");
-
-		if (mddev->level == LEVEL_MULTIPATH)
-			/* only need to write one superblock... */
-			break;
-	}
-	md_super_wait(mddev);
-	/* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
-
-	spin_lock_irq(&mddev->write_lock);
-	if (mddev->in_sync != sync_req ||
-	    test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
-		/* have to write it out again */
-		spin_unlock_irq(&mddev->write_lock);
-		goto repeat;
-	}
-	clear_bit(MD_CHANGE_PENDING, &mddev->flags);
-	spin_unlock_irq(&mddev->write_lock);
-	wake_up(&mddev->sb_wait);
-	if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
-		sysfs_notify(&mddev->kobj, NULL, "sync_completed");
-
-	rdev_for_each(rdev, mddev) {
-		if (test_and_clear_bit(FaultRecorded, &rdev->flags))
-			clear_bit(Blocked, &rdev->flags);
-
-		if (any_badblocks_changed)
-			md_ack_all_badblocks(&rdev->badblocks);
-		clear_bit(BlockedBadBlocks, &rdev->flags);
-		wake_up(&rdev->blocked_wait);
-	}
-}
-
-/* words written to sysfs files may, or may not, be \n terminated.
- * We want to accept with case. For this we use cmd_match.
- */
-static int cmd_match(const char *cmd, const char *str)
-{
-	/* See if cmd, written into a sysfs file, matches
-	 * str.  They must either be the same, or cmd can
-	 * have a trailing newline
-	 */
-	while (*cmd && *str && *cmd == *str) {
-		cmd++;
-		str++;
-	}
-	if (*cmd == '\n')
-		cmd++;
-	if (*str || *cmd)
-		return 0;
-	return 1;
-}
-
-struct rdev_sysfs_entry {
-	struct attribute attr;
-	ssize_t (*show)(struct md_rdev *, char *);
-	ssize_t (*store)(struct md_rdev *, const char *, size_t);
-};
-
-static ssize_t
-state_show(struct md_rdev *rdev, char *page)
-{
-	char *sep = "";
-	size_t len = 0;
-
-	if (test_bit(Faulty, &rdev->flags) ||
-	    rdev->badblocks.unacked_exist) {
-		len+= sprintf(page+len, "%sfaulty",sep);
-		sep = ",";
-	}
-	if (test_bit(In_sync, &rdev->flags)) {
-		len += sprintf(page+len, "%sin_sync",sep);
-		sep = ",";
-	}
-	if (test_bit(WriteMostly, &rdev->flags)) {
-		len += sprintf(page+len, "%swrite_mostly",sep);
-		sep = ",";
-	}
-	if (test_bit(Blocked, &rdev->flags) ||
-	    (rdev->badblocks.unacked_exist
-	     && !test_bit(Faulty, &rdev->flags))) {
-		len += sprintf(page+len, "%sblocked", sep);
-		sep = ",";
-	}
-	if (!test_bit(Faulty, &rdev->flags) &&
-	    !test_bit(In_sync, &rdev->flags)) {
-		len += sprintf(page+len, "%sspare", sep);
-		sep = ",";
-	}
-	if (test_bit(WriteErrorSeen, &rdev->flags)) {
-		len += sprintf(page+len, "%swrite_error", sep);
-		sep = ",";
-	}
-	if (test_bit(WantReplacement, &rdev->flags)) {
-		len += sprintf(page+len, "%swant_replacement", sep);
-		sep = ",";
-	}
-	if (test_bit(Replacement, &rdev->flags)) {
-		len += sprintf(page+len, "%sreplacement", sep);
-		sep = ",";
-	}
-
-	return len+sprintf(page+len, "\n");
-}
-
-static ssize_t
-state_store(struct md_rdev *rdev, const char *buf, size_t len)
-{
-	/* can write
-	 *  faulty  - simulates an error
-	 *  remove  - disconnects the device
-	 *  writemostly - sets write_mostly
-	 *  -writemostly - clears write_mostly
-	 *  blocked - sets the Blocked flags
-	 *  -blocked - clears the Blocked and possibly simulates an error
-	 *  insync - sets Insync providing device isn't active
-	 *  write_error - sets WriteErrorSeen
-	 *  -write_error - clears WriteErrorSeen
-	 */
-	int err = -EINVAL;
-	if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
-		md_error(rdev->mddev, rdev);
-		if (test_bit(Faulty, &rdev->flags))
-			err = 0;
-		else
-			err = -EBUSY;
-	} else if (cmd_match(buf, "remove")) {
-		if (rdev->raid_disk >= 0)
-			err = -EBUSY;
-		else {
-			struct mddev *mddev = rdev->mddev;
-			kick_rdev_from_array(rdev);
-			if (mddev->pers)
-				md_update_sb(mddev, 1);
-			md_new_event(mddev);
-			err = 0;
-		}
-	} else if (cmd_match(buf, "writemostly")) {
-		set_bit(WriteMostly, &rdev->flags);
-		err = 0;
-	} else if (cmd_match(buf, "-writemostly")) {
-		clear_bit(WriteMostly, &rdev->flags);
-		err = 0;
-	} else if (cmd_match(buf, "blocked")) {
-		set_bit(Blocked, &rdev->flags);
-		err = 0;
-	} else if (cmd_match(buf, "-blocked")) {
-		if (!test_bit(Faulty, &rdev->flags) &&
-		    rdev->badblocks.unacked_exist) {
-			/* metadata handler doesn't understand badblocks,
-			 * so we need to fail the device
-			 */
-			md_error(rdev->mddev, rdev);
-		}
-		clear_bit(Blocked, &rdev->flags);
-		clear_bit(BlockedBadBlocks, &rdev->flags);
-		wake_up(&rdev->blocked_wait);
-		set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
-		md_wakeup_thread(rdev->mddev->thread);
-
-		err = 0;
-	} else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
-		set_bit(In_sync, &rdev->flags);
-		err = 0;
-	} else if (cmd_match(buf, "write_error")) {
-		set_bit(WriteErrorSeen, &rdev->flags);
-		err = 0;
-	} else if (cmd_match(buf, "-write_error")) {
-		clear_bit(WriteErrorSeen, &rdev->flags);
-		err = 0;
-	} else if (cmd_match(buf, "want_replacement")) {
-		/* Any non-spare device that is not a replacement can
-		 * become want_replacement at any time, but we then need to
-		 * check if recovery is needed.
-		 */
-		if (rdev->raid_disk >= 0 &&
-		    !test_bit(Replacement, &rdev->flags))
-			set_bit(WantReplacement, &rdev->flags);
-		set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
-		md_wakeup_thread(rdev->mddev->thread);
-		err = 0;
-	} else if (cmd_match(buf, "-want_replacement")) {
-		/* Clearing 'want_replacement' is always allowed.
-		 * Once replacements starts it is too late though.
-		 */
-		err = 0;
-		clear_bit(WantReplacement, &rdev->flags);
-	} else if (cmd_match(buf, "replacement")) {
-		/* Can only set a device as a replacement when array has not
-		 * yet been started.  Once running, replacement is automatic
-		 * from spares, or by assigning 'slot'.
-		 */
-		if (rdev->mddev->pers)
-			err = -EBUSY;
-		else {
-			set_bit(Replacement, &rdev->flags);
-			err = 0;
-		}
-	} else if (cmd_match(buf, "-replacement")) {
-		/* Similarly, can only clear Replacement before start */
-		if (rdev->mddev->pers)
-			err = -EBUSY;
-		else {
-			clear_bit(Replacement, &rdev->flags);
-			err = 0;
-		}
-	}
-	if (!err)
-		sysfs_notify_dirent_safe(rdev->sysfs_state);
-	return err ? err : len;
-}
-static struct rdev_sysfs_entry rdev_state =
-__ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
-
-static ssize_t
-errors_show(struct md_rdev *rdev, char *page)
-{
-	return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
-}
-
-static ssize_t
-errors_store(struct md_rdev *rdev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long n = simple_strtoul(buf, &e, 10);
-	if (*buf && (*e == 0 || *e == '\n')) {
-		atomic_set(&rdev->corrected_errors, n);
-		return len;
-	}
-	return -EINVAL;
-}
-static struct rdev_sysfs_entry rdev_errors =
-__ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
-
-static ssize_t
-slot_show(struct md_rdev *rdev, char *page)
-{
-	if (rdev->raid_disk < 0)
-		return sprintf(page, "none\n");
-	else
-		return sprintf(page, "%d\n", rdev->raid_disk);
-}
-
-static ssize_t
-slot_store(struct md_rdev *rdev, const char *buf, size_t len)
-{
-	char *e;
-	int err;
-	int slot = simple_strtoul(buf, &e, 10);
-	if (strncmp(buf, "none", 4)==0)
-		slot = -1;
-	else if (e==buf || (*e && *e!= '\n'))
-		return -EINVAL;
-	if (rdev->mddev->pers && slot == -1) {
-		/* Setting 'slot' on an active array requires also
-		 * updating the 'rd%d' link, and communicating
-		 * with the personality with ->hot_*_disk.
-		 * For now we only support removing
-		 * failed/spare devices.  This normally happens automatically,
-		 * but not when the metadata is externally managed.
-		 */
-		if (rdev->raid_disk == -1)
-			return -EEXIST;
-		/* personality does all needed checks */
-		if (rdev->mddev->pers->hot_remove_disk == NULL)
-			return -EINVAL;
-		err = rdev->mddev->pers->
-			hot_remove_disk(rdev->mddev, rdev);
-		if (err)
-			return err;
-		sysfs_unlink_rdev(rdev->mddev, rdev);
-		rdev->raid_disk = -1;
-		set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
-		md_wakeup_thread(rdev->mddev->thread);
-	} else if (rdev->mddev->pers) {
-		/* Activating a spare .. or possibly reactivating
-		 * if we ever get bitmaps working here.
-		 */
-
-		if (rdev->raid_disk != -1)
-			return -EBUSY;
-
-		if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery))
-			return -EBUSY;
-
-		if (rdev->mddev->pers->hot_add_disk == NULL)
-			return -EINVAL;
-
-		if (slot >= rdev->mddev->raid_disks &&
-		    slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
-			return -ENOSPC;
-
-		rdev->raid_disk = slot;
-		if (test_bit(In_sync, &rdev->flags))
-			rdev->saved_raid_disk = slot;
-		else
-			rdev->saved_raid_disk = -1;
-		clear_bit(In_sync, &rdev->flags);
-		err = rdev->mddev->pers->
-			hot_add_disk(rdev->mddev, rdev);
-		if (err) {
-			rdev->raid_disk = -1;
-			return err;
-		} else
-			sysfs_notify_dirent_safe(rdev->sysfs_state);
-		if (sysfs_link_rdev(rdev->mddev, rdev))
-			/* failure here is OK */;
-		/* don't wakeup anyone, leave that to userspace. */
-	} else {
-		if (slot >= rdev->mddev->raid_disks &&
-		    slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks)
-			return -ENOSPC;
-		rdev->raid_disk = slot;
-		/* assume it is working */
-		clear_bit(Faulty, &rdev->flags);
-		clear_bit(WriteMostly, &rdev->flags);
-		set_bit(In_sync, &rdev->flags);
-		sysfs_notify_dirent_safe(rdev->sysfs_state);
-	}
-	return len;
-}
-
-
-static struct rdev_sysfs_entry rdev_slot =
-__ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
-
-static ssize_t
-offset_show(struct md_rdev *rdev, char *page)
-{
-	return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
-}
-
-static ssize_t
-offset_store(struct md_rdev *rdev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long long offset = simple_strtoull(buf, &e, 10);
-	if (e==buf || (*e && *e != '\n'))
-		return -EINVAL;
-	if (rdev->mddev->pers && rdev->raid_disk >= 0)
-		return -EBUSY;
-	if (rdev->sectors && rdev->mddev->external)
-		/* Must set offset before size, so overlap checks
-		 * can be sane */
-		return -EBUSY;
-	rdev->data_offset = offset;
-	return len;
-}
-
-static struct rdev_sysfs_entry rdev_offset =
-__ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
-
-static ssize_t
-rdev_size_show(struct md_rdev *rdev, char *page)
-{
-	return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
-}
-
-static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
-{
-	/* check if two start/length pairs overlap */
-	if (s1+l1 <= s2)
-		return 0;
-	if (s2+l2 <= s1)
-		return 0;
-	return 1;
-}
-
-static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
-{
-	unsigned long long blocks;
-	sector_t new;
-
-	if (strict_strtoull(buf, 10, &blocks) < 0)
-		return -EINVAL;
-
-	if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
-		return -EINVAL; /* sector conversion overflow */
-
-	new = blocks * 2;
-	if (new != blocks * 2)
-		return -EINVAL; /* unsigned long long to sector_t overflow */
-
-	*sectors = new;
-	return 0;
-}
-
-static ssize_t
-rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len)
-{
-	struct mddev *my_mddev = rdev->mddev;
-	sector_t oldsectors = rdev->sectors;
-	sector_t sectors;
-
-	if (strict_blocks_to_sectors(buf, &sectors) < 0)
-		return -EINVAL;
-	if (my_mddev->pers && rdev->raid_disk >= 0) {
-		if (my_mddev->persistent) {
-			sectors = super_types[my_mddev->major_version].
-				rdev_size_change(rdev, sectors);
-			if (!sectors)
-				return -EBUSY;
-		} else if (!sectors)
-			sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
-				rdev->data_offset;
-	}
-	if (sectors < my_mddev->dev_sectors)
-		return -EINVAL; /* component must fit device */
-
-	rdev->sectors = sectors;
-	if (sectors > oldsectors && my_mddev->external) {
-		/* need to check that all other rdevs with the same ->bdev
-		 * do not overlap.  We need to unlock the mddev to avoid
-		 * a deadlock.  We have already changed rdev->sectors, and if
-		 * we have to change it back, we will have the lock again.
-		 */
-		struct mddev *mddev;
-		int overlap = 0;
-		struct list_head *tmp;
-
-		mddev_unlock(my_mddev);
-		for_each_mddev(mddev, tmp) {
-			struct md_rdev *rdev2;
-
-			mddev_lock(mddev);
-			rdev_for_each(rdev2, mddev)
-				if (rdev->bdev == rdev2->bdev &&
-				    rdev != rdev2 &&
-				    overlaps(rdev->data_offset, rdev->sectors,
-					     rdev2->data_offset,
-					     rdev2->sectors)) {
-					overlap = 1;
-					break;
-				}
-			mddev_unlock(mddev);
-			if (overlap) {
-				mddev_put(mddev);
-				break;
-			}
-		}
-		mddev_lock(my_mddev);
-		if (overlap) {
-			/* Someone else could have slipped in a size
-			 * change here, but doing so is just silly.
-			 * We put oldsectors back because we *know* it is
-			 * safe, and trust userspace not to race with
-			 * itself
-			 */
-			rdev->sectors = oldsectors;
-			return -EBUSY;
-		}
-	}
-	return len;
-}
-
-static struct rdev_sysfs_entry rdev_size =
-__ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
-
-
-static ssize_t recovery_start_show(struct md_rdev *rdev, char *page)
-{
-	unsigned long long recovery_start = rdev->recovery_offset;
-
-	if (test_bit(In_sync, &rdev->flags) ||
-	    recovery_start == MaxSector)
-		return sprintf(page, "none\n");
-
-	return sprintf(page, "%llu\n", recovery_start);
-}
-
-static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len)
-{
-	unsigned long long recovery_start;
-
-	if (cmd_match(buf, "none"))
-		recovery_start = MaxSector;
-	else if (strict_strtoull(buf, 10, &recovery_start))
-		return -EINVAL;
-
-	if (rdev->mddev->pers &&
-	    rdev->raid_disk >= 0)
-		return -EBUSY;
-
-	rdev->recovery_offset = recovery_start;
-	if (recovery_start == MaxSector)
-		set_bit(In_sync, &rdev->flags);
-	else
-		clear_bit(In_sync, &rdev->flags);
-	return len;
-}
-
-static struct rdev_sysfs_entry rdev_recovery_start =
-__ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store);
-
-
-static ssize_t
-badblocks_show(struct badblocks *bb, char *page, int unack);
-static ssize_t
-badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack);
-
-static ssize_t bb_show(struct md_rdev *rdev, char *page)
-{
-	return badblocks_show(&rdev->badblocks, page, 0);
-}
-static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len)
-{
-	int rv = badblocks_store(&rdev->badblocks, page, len, 0);
-	/* Maybe that ack was all we needed */
-	if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags))
-		wake_up(&rdev->blocked_wait);
-	return rv;
-}
-static struct rdev_sysfs_entry rdev_bad_blocks =
-__ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store);
-
-
-static ssize_t ubb_show(struct md_rdev *rdev, char *page)
-{
-	return badblocks_show(&rdev->badblocks, page, 1);
-}
-static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len)
-{
-	return badblocks_store(&rdev->badblocks, page, len, 1);
-}
-static struct rdev_sysfs_entry rdev_unack_bad_blocks =
-__ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store);
-
-static struct attribute *rdev_default_attrs[] = {
-	&rdev_state.attr,
-	&rdev_errors.attr,
-	&rdev_slot.attr,
-	&rdev_offset.attr,
-	&rdev_size.attr,
-	&rdev_recovery_start.attr,
-	&rdev_bad_blocks.attr,
-	&rdev_unack_bad_blocks.attr,
-	NULL,
-};
-static ssize_t
-rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
-{
-	struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
-	struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
-	struct mddev *mddev = rdev->mddev;
-	ssize_t rv;
-
-	if (!entry->show)
-		return -EIO;
-
-	rv = mddev ? mddev_lock(mddev) : -EBUSY;
-	if (!rv) {
-		if (rdev->mddev == NULL)
-			rv = -EBUSY;
-		else
-			rv = entry->show(rdev, page);
-		mddev_unlock(mddev);
-	}
-	return rv;
-}
-
-static ssize_t
-rdev_attr_store(struct kobject *kobj, struct attribute *attr,
-	      const char *page, size_t length)
-{
-	struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
-	struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj);
-	ssize_t rv;
-	struct mddev *mddev = rdev->mddev;
-
-	if (!entry->store)
-		return -EIO;
-	if (!capable(CAP_SYS_ADMIN))
-		return -EACCES;
-	rv = mddev ? mddev_lock(mddev): -EBUSY;
-	if (!rv) {
-		if (rdev->mddev == NULL)
-			rv = -EBUSY;
-		else
-			rv = entry->store(rdev, page, length);
-		mddev_unlock(mddev);
-	}
-	return rv;
-}
-
-static void rdev_free(struct kobject *ko)
-{
-	struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj);
-	kfree(rdev);
-}
-static const struct sysfs_ops rdev_sysfs_ops = {
-	.show		= rdev_attr_show,
-	.store		= rdev_attr_store,
-};
-static struct kobj_type rdev_ktype = {
-	.release	= rdev_free,
-	.sysfs_ops	= &rdev_sysfs_ops,
-	.default_attrs	= rdev_default_attrs,
-};
-
-int md_rdev_init(struct md_rdev *rdev)
-{
-	rdev->desc_nr = -1;
-	rdev->saved_raid_disk = -1;
-	rdev->raid_disk = -1;
-	rdev->flags = 0;
-	rdev->data_offset = 0;
-	rdev->sb_events = 0;
-	rdev->last_read_error.tv_sec  = 0;
-	rdev->last_read_error.tv_nsec = 0;
-	rdev->sb_loaded = 0;
-	rdev->bb_page = NULL;
-	atomic_set(&rdev->nr_pending, 0);
-	atomic_set(&rdev->read_errors, 0);
-	atomic_set(&rdev->corrected_errors, 0);
-
-	INIT_LIST_HEAD(&rdev->same_set);
-	init_waitqueue_head(&rdev->blocked_wait);
-
-	/* Add space to store bad block list.
-	 * This reserves the space even on arrays where it cannot
-	 * be used - I wonder if that matters
-	 */
-	rdev->badblocks.count = 0;
-	rdev->badblocks.shift = 0;
-	rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	seqlock_init(&rdev->badblocks.lock);
-	if (rdev->badblocks.page == NULL)
-		return -ENOMEM;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(md_rdev_init);
-/*
- * 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 struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor)
-{
-	char b[BDEVNAME_SIZE];
-	int err;
-	struct md_rdev *rdev;
-	sector_t size;
-
-	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
-	if (!rdev) {
-		printk(KERN_ERR "md: could not alloc mem for new device!\n");
-		return ERR_PTR(-ENOMEM);
-	}
-
-	err = md_rdev_init(rdev);
-	if (err)
-		goto abort_free;
-	err = alloc_disk_sb(rdev);
-	if (err)
-		goto abort_free;
-
-	err = lock_rdev(rdev, newdev, super_format == -2);
-	if (err)
-		goto abort_free;
-
-	kobject_init(&rdev->kobj, &rdev_ktype);
-
-	size = i_size_read(rdev->bdev->bd_inode) >> 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 does not have a valid v%d.%d "
-			       "superblock, not importing!\n",
-				bdevname(rdev->bdev,b),
-			       super_format, super_minor);
-			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;
-		}
-	}
-	if (super_format == -1)
-		/* hot-add for 0.90, or non-persistent: so no badblocks */
-		rdev->badblocks.shift = -1;
-
-	return rdev;
-
-abort_free:
-	if (rdev->bdev)
-		unlock_rdev(rdev);
-	free_disk_sb(rdev);
-	kfree(rdev->badblocks.page);
-	kfree(rdev);
-	return ERR_PTR(err);
-}
-
-/*
- * Check a full RAID array for plausibility
- */
-
-
-static void analyze_sbs(struct mddev * mddev)
-{
-	int i;
-	struct md_rdev *rdev, *freshest, *tmp;
-	char b[BDEVNAME_SIZE];
-
-	freshest = NULL;
-	rdev_for_each_safe(rdev, tmp, mddev)
-		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;
-	rdev_for_each_safe(rdev, tmp, mddev) {
-		if (mddev->max_disks &&
-		    (rdev->desc_nr >= mddev->max_disks ||
-		     i > mddev->max_disks)) {
-			printk(KERN_WARNING
-			       "md: %s: %s: only %d devices permitted\n",
-			       mdname(mddev), bdevname(rdev->bdev, b),
-			       mddev->max_disks);
-			kick_rdev_from_array(rdev);
-			continue;
-		}
-		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;
-			set_bit(In_sync, &rdev->flags);
-		} else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
-			rdev->raid_disk = -1;
-			clear_bit(In_sync, &rdev->flags);
-		}
-	}
-}
-
-/* Read a fixed-point number.
- * Numbers in sysfs attributes should be in "standard" units where
- * possible, so time should be in seconds.
- * However we internally use a a much smaller unit such as 
- * milliseconds or jiffies.
- * This function takes a decimal number with a possible fractional
- * component, and produces an integer which is the result of
- * multiplying that number by 10^'scale'.
- * all without any floating-point arithmetic.
- */
-int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale)
-{
-	unsigned long result = 0;
-	long decimals = -1;
-	while (isdigit(*cp) || (*cp == '.' && decimals < 0)) {
-		if (*cp == '.')
-			decimals = 0;
-		else if (decimals < scale) {
-			unsigned int value;
-			value = *cp - '0';
-			result = result * 10 + value;
-			if (decimals >= 0)
-				decimals++;
-		}
-		cp++;
-	}
-	if (*cp == '\n')
-		cp++;
-	if (*cp)
-		return -EINVAL;
-	if (decimals < 0)
-		decimals = 0;
-	while (decimals < scale) {
-		result *= 10;
-		decimals ++;
-	}
-	*res = result;
-	return 0;
-}
-
-
-static void md_safemode_timeout(unsigned long data);
-
-static ssize_t
-safe_delay_show(struct mddev *mddev, char *page)
-{
-	int msec = (mddev->safemode_delay*1000)/HZ;
-	return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
-}
-static ssize_t
-safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len)
-{
-	unsigned long msec;
-
-	if (strict_strtoul_scaled(cbuf, &msec, 3) < 0)
-		return -EINVAL;
-	if (msec == 0)
-		mddev->safemode_delay = 0;
-	else {
-		unsigned long old_delay = mddev->safemode_delay;
-		mddev->safemode_delay = (msec*HZ)/1000;
-		if (mddev->safemode_delay == 0)
-			mddev->safemode_delay = 1;
-		if (mddev->safemode_delay < old_delay)
-			md_safemode_timeout((unsigned long)mddev);
-	}
-	return len;
-}
-static struct md_sysfs_entry md_safe_delay =
-__ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
-
-static ssize_t
-level_show(struct mddev *mddev, char *page)
-{
-	struct md_personality *p = mddev->pers;
-	if (p)
-		return sprintf(page, "%s\n", p->name);
-	else if (mddev->clevel[0])
-		return sprintf(page, "%s\n", mddev->clevel);
-	else if (mddev->level != LEVEL_NONE)
-		return sprintf(page, "%d\n", mddev->level);
-	else
-		return 0;
-}
-
-static ssize_t
-level_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char clevel[16];
-	ssize_t rv = len;
-	struct md_personality *pers;
-	long level;
-	void *priv;
-	struct md_rdev *rdev;
-
-	if (mddev->pers == NULL) {
-		if (len == 0)
-			return 0;
-		if (len >= sizeof(mddev->clevel))
-			return -ENOSPC;
-		strncpy(mddev->clevel, buf, len);
-		if (mddev->clevel[len-1] == '\n')
-			len--;
-		mddev->clevel[len] = 0;
-		mddev->level = LEVEL_NONE;
-		return rv;
-	}
-
-	/* request to change the personality.  Need to ensure:
-	 *  - array is not engaged in resync/recovery/reshape
-	 *  - old personality can be suspended
-	 *  - new personality will access other array.
-	 */
-
-	if (mddev->sync_thread ||
-	    mddev->reshape_position != MaxSector ||
-	    mddev->sysfs_active)
-		return -EBUSY;
-
-	if (!mddev->pers->quiesce) {
-		printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
-		       mdname(mddev), mddev->pers->name);
-		return -EINVAL;
-	}
-
-	/* Now find the new personality */
-	if (len == 0 || len >= sizeof(clevel))
-		return -EINVAL;
-	strncpy(clevel, buf, len);
-	if (clevel[len-1] == '\n')
-		len--;
-	clevel[len] = 0;
-	if (strict_strtol(clevel, 10, &level))
-		level = LEVEL_NONE;
-
-	if (request_module("md-%s", clevel) != 0)
-		request_module("md-level-%s", clevel);
-	spin_lock(&pers_lock);
-	pers = find_pers(level, clevel);
-	if (!pers || !try_module_get(pers->owner)) {
-		spin_unlock(&pers_lock);
-		printk(KERN_WARNING "md: personality %s not loaded\n", clevel);
-		return -EINVAL;
-	}
-	spin_unlock(&pers_lock);
-
-	if (pers == mddev->pers) {
-		/* Nothing to do! */
-		module_put(pers->owner);
-		return rv;
-	}
-	if (!pers->takeover) {
-		module_put(pers->owner);
-		printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
-		       mdname(mddev), clevel);
-		return -EINVAL;
-	}
-
-	rdev_for_each(rdev, mddev)
-		rdev->new_raid_disk = rdev->raid_disk;
-
-	/* ->takeover must set new_* and/or delta_disks
-	 * if it succeeds, and may set them when it fails.
-	 */
-	priv = pers->takeover(mddev);
-	if (IS_ERR(priv)) {
-		mddev->new_level = mddev->level;
-		mddev->new_layout = mddev->layout;
-		mddev->new_chunk_sectors = mddev->chunk_sectors;
-		mddev->raid_disks -= mddev->delta_disks;
-		mddev->delta_disks = 0;
-		module_put(pers->owner);
-		printk(KERN_WARNING "md: %s: %s would not accept array\n",
-		       mdname(mddev), clevel);
-		return PTR_ERR(priv);
-	}
-
-	/* Looks like we have a winner */
-	mddev_suspend(mddev);
-	mddev->pers->stop(mddev);
-	
-	if (mddev->pers->sync_request == NULL &&
-	    pers->sync_request != NULL) {
-		/* need to add the md_redundancy_group */
-		if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
-			printk(KERN_WARNING
-			       "md: cannot register extra attributes for %s\n",
-			       mdname(mddev));
-		mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action");
-	}		
-	if (mddev->pers->sync_request != NULL &&
-	    pers->sync_request == NULL) {
-		/* need to remove the md_redundancy_group */
-		if (mddev->to_remove == NULL)
-			mddev->to_remove = &md_redundancy_group;
-	}
-
-	if (mddev->pers->sync_request == NULL &&
-	    mddev->external) {
-		/* We are converting from a no-redundancy array
-		 * to a redundancy array and metadata is managed
-		 * externally so we need to be sure that writes
-		 * won't block due to a need to transition
-		 *      clean->dirty
-		 * until external management is started.
-		 */
-		mddev->in_sync = 0;
-		mddev->safemode_delay = 0;
-		mddev->safemode = 0;
-	}
-
-	rdev_for_each(rdev, mddev) {
-		if (rdev->raid_disk < 0)
-			continue;
-		if (rdev->new_raid_disk >= mddev->raid_disks)
-			rdev->new_raid_disk = -1;
-		if (rdev->new_raid_disk == rdev->raid_disk)
-			continue;
-		sysfs_unlink_rdev(mddev, rdev);
-	}
-	rdev_for_each(rdev, mddev) {
-		if (rdev->raid_disk < 0)
-			continue;
-		if (rdev->new_raid_disk == rdev->raid_disk)
-			continue;
-		rdev->raid_disk = rdev->new_raid_disk;
-		if (rdev->raid_disk < 0)
-			clear_bit(In_sync, &rdev->flags);
-		else {
-			if (sysfs_link_rdev(mddev, rdev))
-				printk(KERN_WARNING "md: cannot register rd%d"
-				       " for %s after level change\n",
-				       rdev->raid_disk, mdname(mddev));
-		}
-	}
-
-	module_put(mddev->pers->owner);
-	mddev->pers = pers;
-	mddev->private = priv;
-	strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
-	mddev->level = mddev->new_level;
-	mddev->layout = mddev->new_layout;
-	mddev->chunk_sectors = mddev->new_chunk_sectors;
-	mddev->delta_disks = 0;
-	mddev->degraded = 0;
-	if (mddev->pers->sync_request == NULL) {
-		/* this is now an array without redundancy, so
-		 * it must always be in_sync
-		 */
-		mddev->in_sync = 1;
-		del_timer_sync(&mddev->safemode_timer);
-	}
-	pers->run(mddev);
-	mddev_resume(mddev);
-	set_bit(MD_CHANGE_DEVS, &mddev->flags);
-	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-	md_wakeup_thread(mddev->thread);
-	sysfs_notify(&mddev->kobj, NULL, "level");
-	md_new_event(mddev);
-	return rv;
-}
-
-static struct md_sysfs_entry md_level =
-__ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
-
-
-static ssize_t
-layout_show(struct mddev *mddev, char *page)
-{
-	/* just a number, not meaningful for all levels */
-	if (mddev->reshape_position != MaxSector &&
-	    mddev->layout != mddev->new_layout)
-		return sprintf(page, "%d (%d)\n",
-			       mddev->new_layout, mddev->layout);
-	return sprintf(page, "%d\n", mddev->layout);
-}
-
-static ssize_t
-layout_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long n = simple_strtoul(buf, &e, 10);
-
-	if (!*buf || (*e && *e != '\n'))
-		return -EINVAL;
-
-	if (mddev->pers) {
-		int err;
-		if (mddev->pers->check_reshape == NULL)
-			return -EBUSY;
-		mddev->new_layout = n;
-		err = mddev->pers->check_reshape(mddev);
-		if (err) {
-			mddev->new_layout = mddev->layout;
-			return err;
-		}
-	} else {
-		mddev->new_layout = n;
-		if (mddev->reshape_position == MaxSector)
-			mddev->layout = n;
-	}
-	return len;
-}
-static struct md_sysfs_entry md_layout =
-__ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
-
-
-static ssize_t
-raid_disks_show(struct mddev *mddev, char *page)
-{
-	if (mddev->raid_disks == 0)
-		return 0;
-	if (mddev->reshape_position != MaxSector &&
-	    mddev->delta_disks != 0)
-		return sprintf(page, "%d (%d)\n", mddev->raid_disks,
-			       mddev->raid_disks - mddev->delta_disks);
-	return sprintf(page, "%d\n", mddev->raid_disks);
-}
-
-static int update_raid_disks(struct mddev *mddev, int raid_disks);
-
-static ssize_t
-raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *e;
-	int rv = 0;
-	unsigned long n = simple_strtoul(buf, &e, 10);
-
-	if (!*buf || (*e && *e != '\n'))
-		return -EINVAL;
-
-	if (mddev->pers)
-		rv = update_raid_disks(mddev, n);
-	else if (mddev->reshape_position != MaxSector) {
-		int olddisks = mddev->raid_disks - mddev->delta_disks;
-		mddev->delta_disks = n - olddisks;
-		mddev->raid_disks = n;
-	} else
-		mddev->raid_disks = n;
-	return rv ? rv : len;
-}
-static struct md_sysfs_entry md_raid_disks =
-__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
-
-static ssize_t
-chunk_size_show(struct mddev *mddev, char *page)
-{
-	if (mddev->reshape_position != MaxSector &&
-	    mddev->chunk_sectors != mddev->new_chunk_sectors)
-		return sprintf(page, "%d (%d)\n",
-			       mddev->new_chunk_sectors << 9,
-			       mddev->chunk_sectors << 9);
-	return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
-}
-
-static ssize_t
-chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long n = simple_strtoul(buf, &e, 10);
-
-	if (!*buf || (*e && *e != '\n'))
-		return -EINVAL;
-
-	if (mddev->pers) {
-		int err;
-		if (mddev->pers->check_reshape == NULL)
-			return -EBUSY;
-		mddev->new_chunk_sectors = n >> 9;
-		err = mddev->pers->check_reshape(mddev);
-		if (err) {
-			mddev->new_chunk_sectors = mddev->chunk_sectors;
-			return err;
-		}
-	} else {
-		mddev->new_chunk_sectors = n >> 9;
-		if (mddev->reshape_position == MaxSector)
-			mddev->chunk_sectors = n >> 9;
-	}
-	return len;
-}
-static struct md_sysfs_entry md_chunk_size =
-__ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
-
-static ssize_t
-resync_start_show(struct mddev *mddev, char *page)
-{
-	if (mddev->recovery_cp == MaxSector)
-		return sprintf(page, "none\n");
-	return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
-}
-
-static ssize_t
-resync_start_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long long n = simple_strtoull(buf, &e, 10);
-
-	if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
-		return -EBUSY;
-	if (cmd_match(buf, "none"))
-		n = MaxSector;
-	else if (!*buf || (*e && *e != '\n'))
-		return -EINVAL;
-
-	mddev->recovery_cp = n;
-	return len;
-}
-static struct md_sysfs_entry md_resync_start =
-__ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
-
-/*
- * The array state can be:
- *
- * clear
- *     No devices, no size, no level
- *     Equivalent to STOP_ARRAY ioctl
- * inactive
- *     May have some settings, but array is not active
- *        all IO results in error
- *     When written, doesn't tear down array, but just stops it
- * suspended (not supported yet)
- *     All IO requests will block. The array can be reconfigured.
- *     Writing this, if accepted, will block until array is quiescent
- * readonly
- *     no resync can happen.  no superblocks get written.
- *     write requests fail
- * read-auto
- *     like readonly, but behaves like 'clean' on a write request.
- *
- * clean - no pending writes, but otherwise active.
- *     When written to inactive array, starts without resync
- *     If a write request arrives then
- *       if metadata is known, mark 'dirty' and switch to 'active'.
- *       if not known, block and switch to write-pending
- *     If written to an active array that has pending writes, then fails.
- * active
- *     fully active: IO and resync can be happening.
- *     When written to inactive array, starts with resync
- *
- * write-pending
- *     clean, but writes are blocked waiting for 'active' to be written.
- *
- * active-idle
- *     like active, but no writes have been seen for a while (100msec).
- *
- */
-enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
-		   write_pending, active_idle, bad_word};
-static char *array_states[] = {
-	"clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
-	"write-pending", "active-idle", NULL };
-
-static int match_word(const char *word, char **list)
-{
-	int n;
-	for (n=0; list[n]; n++)
-		if (cmd_match(word, list[n]))
-			break;
-	return n;
-}
-
-static ssize_t
-array_state_show(struct mddev *mddev, char *page)
-{
-	enum array_state st = inactive;
-
-	if (mddev->pers)
-		switch(mddev->ro) {
-		case 1:
-			st = readonly;
-			break;
-		case 2:
-			st = read_auto;
-			break;
-		case 0:
-			if (mddev->in_sync)
-				st = clean;
-			else if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
-				st = write_pending;
-			else if (mddev->safemode)
-				st = active_idle;
-			else
-				st = active;
-		}
-	else {
-		if (list_empty(&mddev->disks) &&
-		    mddev->raid_disks == 0 &&
-		    mddev->dev_sectors == 0)
-			st = clear;
-		else
-			st = inactive;
-	}
-	return sprintf(page, "%s\n", array_states[st]);
-}
-
-static int do_md_stop(struct mddev * mddev, int ro, int is_open);
-static int md_set_readonly(struct mddev * mddev, int is_open);
-static int do_md_run(struct mddev * mddev);
-static int restart_array(struct mddev *mddev);
-
-static ssize_t
-array_state_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	int err = -EINVAL;
-	enum array_state st = match_word(buf, array_states);
-	switch(st) {
-	case bad_word:
-		break;
-	case clear:
-		/* stopping an active array */
-		if (atomic_read(&mddev->openers) > 0)
-			return -EBUSY;
-		err = do_md_stop(mddev, 0, 0);
-		break;
-	case inactive:
-		/* stopping an active array */
-		if (mddev->pers) {
-			if (atomic_read(&mddev->openers) > 0)
-				return -EBUSY;
-			err = do_md_stop(mddev, 2, 0);
-		} else
-			err = 0; /* already inactive */
-		break;
-	case suspended:
-		break; /* not supported yet */
-	case readonly:
-		if (mddev->pers)
-			err = md_set_readonly(mddev, 0);
-		else {
-			mddev->ro = 1;
-			set_disk_ro(mddev->gendisk, 1);
-			err = do_md_run(mddev);
-		}
-		break;
-	case read_auto:
-		if (mddev->pers) {
-			if (mddev->ro == 0)
-				err = md_set_readonly(mddev, 0);
-			else if (mddev->ro == 1)
-				err = restart_array(mddev);
-			if (err == 0) {
-				mddev->ro = 2;
-				set_disk_ro(mddev->gendisk, 0);
-			}
-		} else {
-			mddev->ro = 2;
-			err = do_md_run(mddev);
-		}
-		break;
-	case clean:
-		if (mddev->pers) {
-			restart_array(mddev);
-			spin_lock_irq(&mddev->write_lock);
-			if (atomic_read(&mddev->writes_pending) == 0) {
-				if (mddev->in_sync == 0) {
-					mddev->in_sync = 1;
-					if (mddev->safemode == 1)
-						mddev->safemode = 0;
-					set_bit(MD_CHANGE_CLEAN, &mddev->flags);
-				}
-				err = 0;
-			} else
-				err = -EBUSY;
-			spin_unlock_irq(&mddev->write_lock);
-		} else
-			err = -EINVAL;
-		break;
-	case active:
-		if (mddev->pers) {
-			restart_array(mddev);
-			clear_bit(MD_CHANGE_PENDING, &mddev->flags);
-			wake_up(&mddev->sb_wait);
-			err = 0;
-		} else {
-			mddev->ro = 0;
-			set_disk_ro(mddev->gendisk, 0);
-			err = do_md_run(mddev);
-		}
-		break;
-	case write_pending:
-	case active_idle:
-		/* these cannot be set */
-		break;
-	}
-	if (err)
-		return err;
-	else {
-		if (mddev->hold_active == UNTIL_IOCTL)
-			mddev->hold_active = 0;
-		sysfs_notify_dirent_safe(mddev->sysfs_state);
-		return len;
-	}
-}
-static struct md_sysfs_entry md_array_state =
-__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
-
-static ssize_t
-max_corrected_read_errors_show(struct mddev *mddev, char *page) {
-	return sprintf(page, "%d\n",
-		       atomic_read(&mddev->max_corr_read_errors));
-}
-
-static ssize_t
-max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long n = simple_strtoul(buf, &e, 10);
-
-	if (*buf && (*e == 0 || *e == '\n')) {
-		atomic_set(&mddev->max_corr_read_errors, n);
-		return len;
-	}
-	return -EINVAL;
-}
-
-static struct md_sysfs_entry max_corr_read_errors =
-__ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show,
-	max_corrected_read_errors_store);
-
-static ssize_t
-null_show(struct mddev *mddev, char *page)
-{
-	return -EINVAL;
-}
-
-static ssize_t
-new_dev_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	/* buf must be %d:%d\n? giving major and minor numbers */
-	/* The new device is added to the array.
-	 * If the array has a persistent superblock, we read the
-	 * superblock to initialise info and check validity.
-	 * Otherwise, only checking done is that in bind_rdev_to_array,
-	 * which mainly checks size.
-	 */
-	char *e;
-	int major = simple_strtoul(buf, &e, 10);
-	int minor;
-	dev_t dev;
-	struct md_rdev *rdev;
-	int err;
-
-	if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
-		return -EINVAL;
-	minor = simple_strtoul(e+1, &e, 10);
-	if (*e && *e != '\n')
-		return -EINVAL;
-	dev = MKDEV(major, minor);
-	if (major != MAJOR(dev) ||
-	    minor != MINOR(dev))
-		return -EOVERFLOW;
-
-
-	if (mddev->persistent) {
-		rdev = md_import_device(dev, mddev->major_version,
-					mddev->minor_version);
-		if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
-			struct md_rdev *rdev0
-				= list_entry(mddev->disks.next,
-					     struct md_rdev, same_set);
-			err = super_types[mddev->major_version]
-				.load_super(rdev, rdev0, mddev->minor_version);
-			if (err < 0)
-				goto out;
-		}
-	} else if (mddev->external)
-		rdev = md_import_device(dev, -2, -1);
-	else
-		rdev = md_import_device(dev, -1, -1);
-
-	if (IS_ERR(rdev))
-		return PTR_ERR(rdev);
-	err = bind_rdev_to_array(rdev, mddev);
- out:
-	if (err)
-		export_rdev(rdev);
-	return err ? err : len;
-}
-
-static struct md_sysfs_entry md_new_device =
-__ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
-
-static ssize_t
-bitmap_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *end;
-	unsigned long chunk, end_chunk;
-
-	if (!mddev->bitmap)
-		goto out;
-	/* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
-	while (*buf) {
-		chunk = end_chunk = simple_strtoul(buf, &end, 0);
-		if (buf == end) break;
-		if (*end == '-') { /* range */
-			buf = end + 1;
-			end_chunk = simple_strtoul(buf, &end, 0);
-			if (buf == end) break;
-		}
-		if (*end && !isspace(*end)) break;
-		bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
-		buf = skip_spaces(end);
-	}
-	bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
-out:
-	return len;
-}
-
-static struct md_sysfs_entry md_bitmap =
-__ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
-
-static ssize_t
-size_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%llu\n",
-		(unsigned long long)mddev->dev_sectors / 2);
-}
-
-static int update_size(struct mddev *mddev, sector_t num_sectors);
-
-static ssize_t
-size_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	/* If array is inactive, we can reduce the component size, but
-	 * not increase it (except from 0).
-	 * If array is active, we can try an on-line resize
-	 */
-	sector_t sectors;
-	int err = strict_blocks_to_sectors(buf, &sectors);
-
-	if (err < 0)
-		return err;
-	if (mddev->pers) {
-		err = update_size(mddev, sectors);
-		md_update_sb(mddev, 1);
-	} else {
-		if (mddev->dev_sectors == 0 ||
-		    mddev->dev_sectors > sectors)
-			mddev->dev_sectors = sectors;
-		else
-			err = -ENOSPC;
-	}
-	return err ? err : len;
-}
-
-static struct md_sysfs_entry md_size =
-__ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
-
-
-/* Metdata version.
- * This is one of
- *   'none' for arrays with no metadata (good luck...)
- *   'external' for arrays with externally managed metadata,
- * or N.M for internally known formats
- */
-static ssize_t
-metadata_show(struct mddev *mddev, char *page)
-{
-	if (mddev->persistent)
-		return sprintf(page, "%d.%d\n",
-			       mddev->major_version, mddev->minor_version);
-	else if (mddev->external)
-		return sprintf(page, "external:%s\n", mddev->metadata_type);
-	else
-		return sprintf(page, "none\n");
-}
-
-static ssize_t
-metadata_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	int major, minor;
-	char *e;
-	/* Changing the details of 'external' metadata is
-	 * always permitted.  Otherwise there must be
-	 * no devices attached to the array.
-	 */
-	if (mddev->external && strncmp(buf, "external:", 9) == 0)
-		;
-	else if (!list_empty(&mddev->disks))
-		return -EBUSY;
-
-	if (cmd_match(buf, "none")) {
-		mddev->persistent = 0;
-		mddev->external = 0;
-		mddev->major_version = 0;
-		mddev->minor_version = 90;
-		return len;
-	}
-	if (strncmp(buf, "external:", 9) == 0) {
-		size_t namelen = len-9;
-		if (namelen >= sizeof(mddev->metadata_type))
-			namelen = sizeof(mddev->metadata_type)-1;
-		strncpy(mddev->metadata_type, buf+9, namelen);
-		mddev->metadata_type[namelen] = 0;
-		if (namelen && mddev->metadata_type[namelen-1] == '\n')
-			mddev->metadata_type[--namelen] = 0;
-		mddev->persistent = 0;
-		mddev->external = 1;
-		mddev->major_version = 0;
-		mddev->minor_version = 90;
-		return len;
-	}
-	major = simple_strtoul(buf, &e, 10);
-	if (e==buf || *e != '.')
-		return -EINVAL;
-	buf = e+1;
-	minor = simple_strtoul(buf, &e, 10);
-	if (e==buf || (*e && *e != '\n') )
-		return -EINVAL;
-	if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
-		return -ENOENT;
-	mddev->major_version = major;
-	mddev->minor_version = minor;
-	mddev->persistent = 1;
-	mddev->external = 0;
-	return len;
-}
-
-static struct md_sysfs_entry md_metadata =
-__ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
-
-static ssize_t
-action_show(struct mddev *mddev, char *page)
-{
-	char *type = "idle";
-	if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
-		type = "frozen";
-	else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
-	    (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
-		if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
-			type = "reshape";
-		else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
-			if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
-				type = "resync";
-			else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
-				type = "check";
-			else
-				type = "repair";
-		} else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
-			type = "recover";
-	}
-	return sprintf(page, "%s\n", type);
-}
-
-static void reap_sync_thread(struct mddev *mddev);
-
-static ssize_t
-action_store(struct mddev *mddev, const char *page, size_t len)
-{
-	if (!mddev->pers || !mddev->pers->sync_request)
-		return -EINVAL;
-
-	if (cmd_match(page, "frozen"))
-		set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-	else
-		clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-
-	if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
-		if (mddev->sync_thread) {
-			set_bit(MD_RECOVERY_INTR, &mddev->recovery);
-			reap_sync_thread(mddev);
-		}
-	} else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
-		   test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
-		return -EBUSY;
-	else if (cmd_match(page, "resync"))
-		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-	else if (cmd_match(page, "recover")) {
-		set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
-		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-	} else if (cmd_match(page, "reshape")) {
-		int err;
-		if (mddev->pers->start_reshape == NULL)
-			return -EINVAL;
-		err = mddev->pers->start_reshape(mddev);
-		if (err)
-			return err;
-		sysfs_notify(&mddev->kobj, NULL, "degraded");
-	} else {
-		if (cmd_match(page, "check"))
-			set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
-		else if (!cmd_match(page, "repair"))
-			return -EINVAL;
-		set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
-		set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
-	}
-	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-	md_wakeup_thread(mddev->thread);
-	sysfs_notify_dirent_safe(mddev->sysfs_action);
-	return len;
-}
-
-static ssize_t
-mismatch_cnt_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%llu\n",
-		       (unsigned long long) mddev->resync_mismatches);
-}
-
-static struct md_sysfs_entry md_scan_mode =
-__ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
-
-
-static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
-
-static ssize_t
-sync_min_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%d (%s)\n", speed_min(mddev),
-		       mddev->sync_speed_min ? "local": "system");
-}
-
-static ssize_t
-sync_min_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	int min;
-	char *e;
-	if (strncmp(buf, "system", 6)==0) {
-		mddev->sync_speed_min = 0;
-		return len;
-	}
-	min = simple_strtoul(buf, &e, 10);
-	if (buf == e || (*e && *e != '\n') || min <= 0)
-		return -EINVAL;
-	mddev->sync_speed_min = min;
-	return len;
-}
-
-static struct md_sysfs_entry md_sync_min =
-__ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
-
-static ssize_t
-sync_max_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%d (%s)\n", speed_max(mddev),
-		       mddev->sync_speed_max ? "local": "system");
-}
-
-static ssize_t
-sync_max_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	int max;
-	char *e;
-	if (strncmp(buf, "system", 6)==0) {
-		mddev->sync_speed_max = 0;
-		return len;
-	}
-	max = simple_strtoul(buf, &e, 10);
-	if (buf == e || (*e && *e != '\n') || max <= 0)
-		return -EINVAL;
-	mddev->sync_speed_max = max;
-	return len;
-}
-
-static struct md_sysfs_entry md_sync_max =
-__ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
-
-static ssize_t
-degraded_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%d\n", mddev->degraded);
-}
-static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
-
-static ssize_t
-sync_force_parallel_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%d\n", mddev->parallel_resync);
-}
-
-static ssize_t
-sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	long n;
-
-	if (strict_strtol(buf, 10, &n))
-		return -EINVAL;
-
-	if (n != 0 && n != 1)
-		return -EINVAL;
-
-	mddev->parallel_resync = n;
-
-	if (mddev->sync_thread)
-		wake_up(&resync_wait);
-
-	return len;
-}
-
-/* force parallel resync, even with shared block devices */
-static struct md_sysfs_entry md_sync_force_parallel =
-__ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
-       sync_force_parallel_show, sync_force_parallel_store);
-
-static ssize_t
-sync_speed_show(struct mddev *mddev, char *page)
-{
-	unsigned long resync, dt, db;
-	if (mddev->curr_resync == 0)
-		return sprintf(page, "none\n");
-	resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
-	dt = (jiffies - mddev->resync_mark) / HZ;
-	if (!dt) dt++;
-	db = resync - mddev->resync_mark_cnt;
-	return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
-}
-
-static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
-
-static ssize_t
-sync_completed_show(struct mddev *mddev, char *page)
-{
-	unsigned long long max_sectors, resync;
-
-	if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
-		return sprintf(page, "none\n");
-
-	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
-		max_sectors = mddev->resync_max_sectors;
-	else
-		max_sectors = mddev->dev_sectors;
-
-	resync = mddev->curr_resync_completed;
-	return sprintf(page, "%llu / %llu\n", resync, max_sectors);
-}
-
-static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
-
-static ssize_t
-min_sync_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%llu\n",
-		       (unsigned long long)mddev->resync_min);
-}
-static ssize_t
-min_sync_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	unsigned long long min;
-	if (strict_strtoull(buf, 10, &min))
-		return -EINVAL;
-	if (min > mddev->resync_max)
-		return -EINVAL;
-	if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
-		return -EBUSY;
-
-	/* Must be a multiple of chunk_size */
-	if (mddev->chunk_sectors) {
-		sector_t temp = min;
-		if (sector_div(temp, mddev->chunk_sectors))
-			return -EINVAL;
-	}
-	mddev->resync_min = min;
-
-	return len;
-}
-
-static struct md_sysfs_entry md_min_sync =
-__ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
-
-static ssize_t
-max_sync_show(struct mddev *mddev, char *page)
-{
-	if (mddev->resync_max == MaxSector)
-		return sprintf(page, "max\n");
-	else
-		return sprintf(page, "%llu\n",
-			       (unsigned long long)mddev->resync_max);
-}
-static ssize_t
-max_sync_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	if (strncmp(buf, "max", 3) == 0)
-		mddev->resync_max = MaxSector;
-	else {
-		unsigned long long max;
-		if (strict_strtoull(buf, 10, &max))
-			return -EINVAL;
-		if (max < mddev->resync_min)
-			return -EINVAL;
-		if (max < mddev->resync_max &&
-		    mddev->ro == 0 &&
-		    test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
-			return -EBUSY;
-
-		/* Must be a multiple of chunk_size */
-		if (mddev->chunk_sectors) {
-			sector_t temp = max;
-			if (sector_div(temp, mddev->chunk_sectors))
-				return -EINVAL;
-		}
-		mddev->resync_max = max;
-	}
-	wake_up(&mddev->recovery_wait);
-	return len;
-}
-
-static struct md_sysfs_entry md_max_sync =
-__ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
-
-static ssize_t
-suspend_lo_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
-}
-
-static ssize_t
-suspend_lo_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long long new = simple_strtoull(buf, &e, 10);
-	unsigned long long old = mddev->suspend_lo;
-
-	if (mddev->pers == NULL || 
-	    mddev->pers->quiesce == NULL)
-		return -EINVAL;
-	if (buf == e || (*e && *e != '\n'))
-		return -EINVAL;
-
-	mddev->suspend_lo = new;
-	if (new >= old)
-		/* Shrinking suspended region */
-		mddev->pers->quiesce(mddev, 2);
-	else {
-		/* Expanding suspended region - need to wait */
-		mddev->pers->quiesce(mddev, 1);
-		mddev->pers->quiesce(mddev, 0);
-	}
-	return len;
-}
-static struct md_sysfs_entry md_suspend_lo =
-__ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
-
-
-static ssize_t
-suspend_hi_show(struct mddev *mddev, char *page)
-{
-	return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
-}
-
-static ssize_t
-suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long long new = simple_strtoull(buf, &e, 10);
-	unsigned long long old = mddev->suspend_hi;
-
-	if (mddev->pers == NULL ||
-	    mddev->pers->quiesce == NULL)
-		return -EINVAL;
-	if (buf == e || (*e && *e != '\n'))
-		return -EINVAL;
-
-	mddev->suspend_hi = new;
-	if (new <= old)
-		/* Shrinking suspended region */
-		mddev->pers->quiesce(mddev, 2);
-	else {
-		/* Expanding suspended region - need to wait */
-		mddev->pers->quiesce(mddev, 1);
-		mddev->pers->quiesce(mddev, 0);
-	}
-	return len;
-}
-static struct md_sysfs_entry md_suspend_hi =
-__ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
-
-static ssize_t
-reshape_position_show(struct mddev *mddev, char *page)
-{
-	if (mddev->reshape_position != MaxSector)
-		return sprintf(page, "%llu\n",
-			       (unsigned long long)mddev->reshape_position);
-	strcpy(page, "none\n");
-	return 5;
-}
-
-static ssize_t
-reshape_position_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	char *e;
-	unsigned long long new = simple_strtoull(buf, &e, 10);
-	if (mddev->pers)
-		return -EBUSY;
-	if (buf == e || (*e && *e != '\n'))
-		return -EINVAL;
-	mddev->reshape_position = new;
-	mddev->delta_disks = 0;
-	mddev->new_level = mddev->level;
-	mddev->new_layout = mddev->layout;
-	mddev->new_chunk_sectors = mddev->chunk_sectors;
-	return len;
-}
-
-static struct md_sysfs_entry md_reshape_position =
-__ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
-       reshape_position_store);
-
-static ssize_t
-array_size_show(struct mddev *mddev, char *page)
-{
-	if (mddev->external_size)
-		return sprintf(page, "%llu\n",
-			       (unsigned long long)mddev->array_sectors/2);
-	else
-		return sprintf(page, "default\n");
-}
-
-static ssize_t
-array_size_store(struct mddev *mddev, const char *buf, size_t len)
-{
-	sector_t sectors;
-
-	if (strncmp(buf, "default", 7) == 0) {
-		if (mddev->pers)
-			sectors = mddev->pers->size(mddev, 0, 0);
-		else
-			sectors = mddev->array_sectors;
-
-		mddev->external_size = 0;
-	} else {
-		if (strict_blocks_to_sectors(buf, &sectors) < 0)
-			return -EINVAL;
-		if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
-			return -E2BIG;
-
-		mddev->external_size = 1;
-	}
-
-	mddev->array_sectors = sectors;
-	if (mddev->pers) {
-		set_capacity(mddev->gendisk, mddev->array_sectors);
-		revalidate_disk(mddev->gendisk);
-	}
-	return len;
-}
-
-static struct md_sysfs_entry md_array_size =
-__ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
-       array_size_store);
-
-static struct attribute *md_default_attrs[] = {
-	&md_level.attr,
-	&md_layout.attr,
-	&md_raid_disks.attr,
-	&md_chunk_size.attr,
-	&md_size.attr,
-	&md_resync_start.attr,
-	&md_metadata.attr,
-	&md_new_device.attr,
-	&md_safe_delay.attr,
-	&md_array_state.attr,
-	&md_reshape_position.attr,
-	&md_array_size.attr,
-	&max_corr_read_errors.attr,
-	NULL,
-};
-
-static struct attribute *md_redundancy_attrs[] = {
-	&md_scan_mode.attr,
-	&md_mismatches.attr,
-	&md_sync_min.attr,
-	&md_sync_max.attr,
-	&md_sync_speed.attr,
-	&md_sync_force_parallel.attr,
-	&md_sync_completed.attr,
-	&md_min_sync.attr,
-	&md_max_sync.attr,
-	&md_suspend_lo.attr,
-	&md_suspend_hi.attr,
-	&md_bitmap.attr,
-	&md_degraded.attr,
-	NULL,
-};
-static struct attribute_group md_redundancy_group = {
-	.name = NULL,
-	.attrs = md_redundancy_attrs,
-};
-
-
-static ssize_t
-md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
-{
-	struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
-	struct mddev *mddev = container_of(kobj, struct mddev, kobj);
-	ssize_t rv;
-
-	if (!entry->show)
-		return -EIO;
-	spin_lock(&all_mddevs_lock);
-	if (list_empty(&mddev->all_mddevs)) {
-		spin_unlock(&all_mddevs_lock);
-		return -EBUSY;
-	}
-	mddev_get(mddev);
-	spin_unlock(&all_mddevs_lock);
-
-	rv = mddev_lock(mddev);
-	if (!rv) {
-		rv = entry->show(mddev, page);
-		mddev_unlock(mddev);
-	}
-	mddev_put(mddev);
-	return rv;
-}
-
-static ssize_t
-md_attr_store(struct kobject *kobj, struct attribute *attr,
-	      const char *page, size_t length)
-{
-	struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
-	struct mddev *mddev = container_of(kobj, struct mddev, kobj);
-	ssize_t rv;
-
-	if (!entry->store)
-		return -EIO;
-	if (!capable(CAP_SYS_ADMIN))
-		return -EACCES;
-	spin_lock(&all_mddevs_lock);
-	if (list_empty(&mddev->all_mddevs)) {
-		spin_unlock(&all_mddevs_lock);
-		return -EBUSY;
-	}
-	mddev_get(mddev);
-	spin_unlock(&all_mddevs_lock);
-	rv = mddev_lock(mddev);
-	if (!rv) {
-		rv = entry->store(mddev, page, length);
-		mddev_unlock(mddev);
-	}
-	mddev_put(mddev);
-	return rv;
-}
-
-static void md_free(struct kobject *ko)
-{
-	struct mddev *mddev = container_of(ko, struct mddev, kobj);
-
-	if (mddev->sysfs_state)
-		sysfs_put(mddev->sysfs_state);
-
-	if (mddev->gendisk) {
-		del_gendisk(mddev->gendisk);
-		put_disk(mddev->gendisk);
-	}
-	if (mddev->queue)
-		blk_cleanup_queue(mddev->queue);
-
-	kfree(mddev);
-}
-
-static const struct sysfs_ops md_sysfs_ops = {
-	.show	= md_attr_show,
-	.store	= md_attr_store,
-};
-static struct kobj_type md_ktype = {
-	.release	= md_free,
-	.sysfs_ops	= &md_sysfs_ops,
-	.default_attrs	= md_default_attrs,
-};
-
-int mdp_major = 0;
-
-static void mddev_delayed_delete(struct work_struct *ws)
-{
-	struct mddev *mddev = container_of(ws, struct mddev, del_work);
-
-	sysfs_remove_group(&mddev->kobj, &md_bitmap_group);
-	kobject_del(&mddev->kobj);
-	kobject_put(&mddev->kobj);
-}
-
-static int md_alloc(dev_t dev, char *name)
-{
-	static DEFINE_MUTEX(disks_mutex);
-	struct mddev *mddev = mddev_find(dev);
-	struct gendisk *disk;
-	int partitioned;
-	int shift;
-	int unit;
-	int error;
-
-	if (!mddev)
-		return -ENODEV;
-
-	partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
-	shift = partitioned ? MdpMinorShift : 0;
-	unit = MINOR(mddev->unit) >> shift;
-
-	/* wait for any previous instance of this device to be
-	 * completely removed (mddev_delayed_delete).
-	 */
-	flush_workqueue(md_misc_wq);
-
-	mutex_lock(&disks_mutex);
-	error = -EEXIST;
-	if (mddev->gendisk)
-		goto abort;
-
-	if (name) {
-		/* Need to ensure that 'name' is not a duplicate.
-		 */
-		struct mddev *mddev2;
-		spin_lock(&all_mddevs_lock);
-
-		list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
-			if (mddev2->gendisk &&
-			    strcmp(mddev2->gendisk->disk_name, name) == 0) {
-				spin_unlock(&all_mddevs_lock);
-				goto abort;
-			}
-		spin_unlock(&all_mddevs_lock);
-	}
-
-	error = -ENOMEM;
-	mddev->queue = blk_alloc_queue(GFP_KERNEL);
-	if (!mddev->queue)
-		goto abort;
-	mddev->queue->queuedata = mddev;
-
-	blk_queue_make_request(mddev->queue, md_make_request);
-	blk_set_stacking_limits(&mddev->queue->limits);
-
-	disk = alloc_disk(1 << shift);
-	if (!disk) {
-		blk_cleanup_queue(mddev->queue);
-		mddev->queue = NULL;
-		goto abort;
-	}
-	disk->major = MAJOR(mddev->unit);
-	disk->first_minor = unit << shift;
-	if (name)
-		strcpy(disk->disk_name, name);
-	else if (partitioned)
-		sprintf(disk->disk_name, "md_d%d", unit);
-	else
-		sprintf(disk->disk_name, "md%d", unit);
-	disk->fops = &md_fops;
-	disk->private_data = mddev;
-	disk->queue = mddev->queue;
-	blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA);
-	/* Allow extended partitions.  This makes the
-	 * 'mdp' device redundant, but we can't really
-	 * remove it now.
-	 */
-	disk->flags |= GENHD_FL_EXT_DEVT;
-	mddev->gendisk = disk;
-	/* As soon as we call add_disk(), another thread could get
-	 * through to md_open, so make sure it doesn't get too far
-	 */
-	mutex_lock(&mddev->open_mutex);
-	add_disk(disk);
-
-	error = kobject_init_and_add(&mddev->kobj, &md_ktype,
-				     &disk_to_dev(disk)->kobj, "%s", "md");
-	if (error) {
-		/* This isn't possible, but as kobject_init_and_add is marked
-		 * __must_check, we must do something with the result
-		 */
-		printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
-		       disk->disk_name);
-		error = 0;
-	}
-	if (mddev->kobj.sd &&
-	    sysfs_create_group(&mddev->kobj, &md_bitmap_group))
-		printk(KERN_DEBUG "pointless warning\n");
-	mutex_unlock(&mddev->open_mutex);
- abort:
-	mutex_unlock(&disks_mutex);
-	if (!error && mddev->kobj.sd) {
-		kobject_uevent(&mddev->kobj, KOBJ_ADD);
-		mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
-	}
-	mddev_put(mddev);
-	return error;
-}
-
-static struct kobject *md_probe(dev_t dev, int *part, void *data)
-{
-	md_alloc(dev, NULL);
-	return NULL;
-}
-
-static int add_named_array(const char *val, struct kernel_param *kp)
-{
-	/* val must be "md_*" where * is not all digits.
-	 * We allocate an array with a large free minor number, and
-	 * set the name to val.  val must not already be an active name.
-	 */
-	int len = strlen(val);
-	char buf[DISK_NAME_LEN];
-
-	while (len && val[len-1] == '\n')
-		len--;
-	if (len >= DISK_NAME_LEN)
-		return -E2BIG;
-	strlcpy(buf, val, len+1);
-	if (strncmp(buf, "md_", 3) != 0)
-		return -EINVAL;
-	return md_alloc(0, buf);
-}
-
-static void md_safemode_timeout(unsigned long data)
-{
-	struct mddev *mddev = (struct mddev *) data;
-
-	if (!atomic_read(&mddev->writes_pending)) {
-		mddev->safemode = 1;
-		if (mddev->external)
-			sysfs_notify_dirent_safe(mddev->sysfs_state);
-	}
-	md_wakeup_thread(mddev->thread);
-}
-
-static int start_dirty_degraded;
-
-int md_run(struct mddev *mddev)
-{
-	int err;
-	struct md_rdev *rdev;
-	struct md_personality *pers;
-
-	if (list_empty(&mddev->disks))
-		/* cannot run an array with no devices.. */
-		return -EINVAL;
-
-	if (mddev->pers)
-		return -EBUSY;
-	/* Cannot run until previous stop completes properly */
-	if (mddev->sysfs_active)
-		return -EBUSY;
-
-	/*
-	 * Analyze all RAID superblock(s)
-	 */
-	if (!mddev->raid_disks) {
-		if (!mddev->persistent)
-			return -EINVAL;
-		analyze_sbs(mddev);
-	}
-
-	if (mddev->level != LEVEL_NONE)
-		request_module("md-level-%d", mddev->level);
-	else if (mddev->clevel[0])
-		request_module("md-%s", mddev->clevel);
-
-	/*
-	 * Drop all container device buffers, from now on
-	 * the only valid external interface is through the md
-	 * device.
-	 */
-	rdev_for_each(rdev, mddev) {
-		if (test_bit(Faulty, &rdev->flags))
-			continue;
-		sync_blockdev(rdev->bdev);
-		invalidate_bdev(rdev->bdev);
-
-		/* perform some consistency tests on the device.
-		 * We don't want the data to overlap the metadata,
-		 * Internal Bitmap issues have been handled elsewhere.
-		 */
-		if (rdev->meta_bdev) {
-			/* Nothing to check */;
-		} else if (rdev->data_offset < rdev->sb_start) {
-			if (mddev->dev_sectors &&
-			    rdev->data_offset + mddev->dev_sectors
-			    > rdev->sb_start) {
-				printk("md: %s: data overlaps metadata\n",
-				       mdname(mddev));
-				return -EINVAL;
-			}
-		} else {
-			if (rdev->sb_start + rdev->sb_size/512
-			    > rdev->data_offset) {
-				printk("md: %s: metadata overlaps data\n",
-				       mdname(mddev));
-				return -EINVAL;
-			}
-		}
-		sysfs_notify_dirent_safe(rdev->sysfs_state);
-	}
-
-	if (mddev->bio_set == NULL)
-		mddev->bio_set = bioset_create(BIO_POOL_SIZE,
-					       sizeof(struct mddev *));
-
-	spin_lock(&pers_lock);
-	pers = find_pers(mddev->level, mddev->clevel);
-	if (!pers || !try_module_get(pers->owner)) {
-		spin_unlock(&pers_lock);
-		if (mddev->level != LEVEL_NONE)
-			printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
-			       mddev->level);
-		else
-			printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
-			       mddev->clevel);
-		return -EINVAL;
-	}
-	mddev->pers = pers;
-	spin_unlock(&pers_lock);
-	if (mddev->level != pers->level) {
-		mddev->level = pers->level;
-		mddev->new_level = pers->level;
-	}
-	strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
-
-	if (mddev->reshape_position != MaxSector &&
-	    pers->start_reshape == NULL) {
-		/* This personality cannot handle reshaping... */
-		mddev->pers = NULL;
-		module_put(pers->owner);
-		return -EINVAL;
-	}
-
-	if (pers->sync_request) {
-		/* Warn if this is a potentially silly
-		 * configuration.
-		 */
-		char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
-		struct md_rdev *rdev2;
-		int warned = 0;
-
-		rdev_for_each(rdev, mddev)
-			rdev_for_each(rdev2, mddev) {
-				if (rdev < rdev2 &&
-				    rdev->bdev->bd_contains ==
-				    rdev2->bdev->bd_contains) {
-					printk(KERN_WARNING
-					       "%s: WARNING: %s appears to be"
-					       " on the same physical disk as"
-					       " %s.\n",
-					       mdname(mddev),
-					       bdevname(rdev->bdev,b),
-					       bdevname(rdev2->bdev,b2));
-					warned = 1;
-				}
-			}
-
-		if (warned)
-			printk(KERN_WARNING
-			       "True protection against single-disk"
-			       " failure might be compromised.\n");
-	}
-
-	mddev->recovery = 0;
-	/* may be over-ridden by personality */
-	mddev->resync_max_sectors = mddev->dev_sectors;
-
-	mddev->ok_start_degraded = start_dirty_degraded;
-
-	if (start_readonly && mddev->ro == 0)
-		mddev->ro = 2; /* read-only, but switch on first write */
-
-	err = mddev->pers->run(mddev);
-	if (err)
-		printk(KERN_ERR "md: pers->run() failed ...\n");
-	else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
-		WARN_ONCE(!mddev->external_size, "%s: default size too small,"
-			  " but 'external_size' not in effect?\n", __func__);
-		printk(KERN_ERR
-		       "md: invalid array_size %llu > default size %llu\n",
-		       (unsigned long long)mddev->array_sectors / 2,
-		       (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
-		err = -EINVAL;
-		mddev->pers->stop(mddev);
-	}
-	if (err == 0 && mddev->pers->sync_request) {
-		err = bitmap_create(mddev);
-		if (err) {
-			printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
-			       mdname(mddev), err);
-			mddev->pers->stop(mddev);
-		}
-	}
-	if (err) {
-		module_put(mddev->pers->owner);
-		mddev->pers = NULL;
-		bitmap_destroy(mddev);
-		return err;
-	}
-	if (mddev->pers->sync_request) {
-		if (mddev->kobj.sd &&
-		    sysfs_create_group(&mddev->kobj, &md_redundancy_group))
-			printk(KERN_WARNING
-			       "md: cannot register extra attributes for %s\n",
-			       mdname(mddev));
-		mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action");
-	} else if (mddev->ro == 2) /* auto-readonly not meaningful */
-		mddev->ro = 0;
-
- 	atomic_set(&mddev->writes_pending,0);
-	atomic_set(&mddev->max_corr_read_errors,
-		   MD_DEFAULT_MAX_CORRECTED_READ_ERRORS);
-	mddev->safemode = 0;
-	mddev->safemode_timer.function = md_safemode_timeout;
-	mddev->safemode_timer.data = (unsigned long) mddev;
-	mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
-	mddev->in_sync = 1;
-	smp_wmb();
-	mddev->ready = 1;
-	rdev_for_each(rdev, mddev)
-		if (rdev->raid_disk >= 0)
-			if (sysfs_link_rdev(mddev, rdev))
-				/* failure here is OK */;
-	
-	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-	
-	if (mddev->flags)
-		md_update_sb(mddev, 0);
-
-	md_new_event(mddev);
-	sysfs_notify_dirent_safe(mddev->sysfs_state);
-	sysfs_notify_dirent_safe(mddev->sysfs_action);
-	sysfs_notify(&mddev->kobj, NULL, "degraded");
-	return 0;
-}
-EXPORT_SYMBOL_GPL(md_run);
-
-static int do_md_run(struct mddev *mddev)
-{
-	int err;
-
-	err = md_run(mddev);
-	if (err)
-		goto out;
-	err = bitmap_load(mddev);
-	if (err) {
-		bitmap_destroy(mddev);
-		goto out;
-	}
-
-	md_wakeup_thread(mddev->thread);
-	md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
-
-	set_capacity(mddev->gendisk, mddev->array_sectors);
-	revalidate_disk(mddev->gendisk);
-	mddev->changed = 1;
-	kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
-out:
-	return err;
-}
-
-static int restart_array(struct mddev *mddev)
-{
-	struct gendisk *disk = mddev->gendisk;
-
-	/* Complain if it has no devices */
-	if (list_empty(&mddev->disks))
-		return -ENXIO;
-	if (!mddev->pers)
-		return -EINVAL;
-	if (!mddev->ro)
-		return -EBUSY;
-	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);
-	md_wakeup_thread(mddev->sync_thread);
-	sysfs_notify_dirent_safe(mddev->sysfs_state);
-	return 0;
-}
-
-/* similar to deny_write_access, but accounts for our holding a reference
- * to the file ourselves */
-static int deny_bitmap_write_access(struct file * file)
-{
-	struct inode *inode = file->f_mapping->host;
-
-	spin_lock(&inode->i_lock);
-	if (atomic_read(&inode->i_writecount) > 1) {
-		spin_unlock(&inode->i_lock);
-		return -ETXTBSY;
-	}
-	atomic_set(&inode->i_writecount, -1);
-	spin_unlock(&inode->i_lock);
-
-	return 0;
-}
-
-void restore_bitmap_write_access(struct file *file)
-{
-	struct inode *inode = file->f_mapping->host;
-
-	spin_lock(&inode->i_lock);
-	atomic_set(&inode->i_writecount, 1);
-	spin_unlock(&inode->i_lock);
-}
-
-static void md_clean(struct mddev *mddev)
-{
-	mddev->array_sectors = 0;
-	mddev->external_size = 0;
-	mddev->dev_sectors = 0;
-	mddev->raid_disks = 0;
-	mddev->recovery_cp = 0;
-	mddev->resync_min = 0;
-	mddev->resync_max = MaxSector;
-	mddev->reshape_position = MaxSector;
-	mddev->external = 0;
-	mddev->persistent = 0;
-	mddev->level = LEVEL_NONE;
-	mddev->clevel[0] = 0;
-	mddev->flags = 0;
-	mddev->ro = 0;
-	mddev->metadata_type[0] = 0;
-	mddev->chunk_sectors = 0;
-	mddev->ctime = mddev->utime = 0;
-	mddev->layout = 0;
-	mddev->max_disks = 0;
-	mddev->events = 0;
-	mddev->can_decrease_events = 0;
-	mddev->delta_disks = 0;
-	mddev->new_level = LEVEL_NONE;
-	mddev->new_layout = 0;
-	mddev->new_chunk_sectors = 0;
-	mddev->curr_resync = 0;
-	mddev->resync_mismatches = 0;
-	mddev->suspend_lo = mddev->suspend_hi = 0;
-	mddev->sync_speed_min = mddev->sync_speed_max = 0;
-	mddev->recovery = 0;
-	mddev->in_sync = 0;
-	mddev->changed = 0;
-	mddev->degraded = 0;
-	mddev->safemode = 0;
-	mddev->merge_check_needed = 0;
-	mddev->bitmap_info.offset = 0;
-	mddev->bitmap_info.default_offset = 0;
-	mddev->bitmap_info.chunksize = 0;
-	mddev->bitmap_info.daemon_sleep = 0;
-	mddev->bitmap_info.max_write_behind = 0;
-}
-
-static void __md_stop_writes(struct mddev *mddev)
-{
-	if (mddev->sync_thread) {
-		set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-		set_bit(MD_RECOVERY_INTR, &mddev->recovery);
-		reap_sync_thread(mddev);
-	}
-
-	del_timer_sync(&mddev->safemode_timer);
-
-	bitmap_flush(mddev);
-	md_super_wait(mddev);
-
-	if (!mddev->in_sync || mddev->flags) {
-		/* mark array as shutdown cleanly */
-		mddev->in_sync = 1;
-		md_update_sb(mddev, 1);
-	}
-}
-
-void md_stop_writes(struct mddev *mddev)
-{
-	mddev_lock(mddev);
-	__md_stop_writes(mddev);
-	mddev_unlock(mddev);
-}
-EXPORT_SYMBOL_GPL(md_stop_writes);
-
-void md_stop(struct mddev *mddev)
-{
-	mddev->ready = 0;
-	mddev->pers->stop(mddev);
-	if (mddev->pers->sync_request && mddev->to_remove == NULL)
-		mddev->to_remove = &md_redundancy_group;
-	module_put(mddev->pers->owner);
-	mddev->pers = NULL;
-	clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-}
-EXPORT_SYMBOL_GPL(md_stop);
-
-static int md_set_readonly(struct mddev *mddev, int is_open)
-{
-	int err = 0;
-	mutex_lock(&mddev->open_mutex);
-	if (atomic_read(&mddev->openers) > is_open) {
-		printk("md: %s still in use.\n",mdname(mddev));
-		err = -EBUSY;
-		goto out;
-	}
-	if (mddev->pers) {
-		__md_stop_writes(mddev);
-
-		err  = -ENXIO;
-		if (mddev->ro==1)
-			goto out;
-		mddev->ro = 1;
-		set_disk_ro(mddev->gendisk, 1);
-		clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
-		sysfs_notify_dirent_safe(mddev->sysfs_state);
-		err = 0;	
-	}
-out:
-	mutex_unlock(&mddev->open_mutex);
-	return err;
-}
-
-/* mode:
- *   0 - completely stop and dis-assemble array
- *   2 - stop but do not disassemble array
- */
-static int do_md_stop(struct mddev * mddev, int mode, int is_open)
-{
-	struct gendisk *disk = mddev->gendisk;
-	struct md_rdev *rdev;
-
-	mutex_lock(&mddev->open_mutex);
-	if (atomic_read(&mddev->openers) > is_open ||
-	    mddev->sysfs_active) {
-		printk("md: %s still in use.\n",mdname(mddev));
-		mutex_unlock(&mddev->open_mutex);
-		return -EBUSY;
-	}
-
-	if (mddev->pers) {
-		if (mddev->ro)
-			set_disk_ro(disk, 0);
-
-		__md_stop_writes(mddev);
-		md_stop(mddev);
-		mddev->queue->merge_bvec_fn = NULL;
-		mddev->queue->backing_dev_info.congested_fn = NULL;
-
-		/* tell userspace to handle 'inactive' */
-		sysfs_notify_dirent_safe(mddev->sysfs_state);
-
-		rdev_for_each(rdev, mddev)
-			if (rdev->raid_disk >= 0)
-				sysfs_unlink_rdev(mddev, rdev);
-
-		set_capacity(disk, 0);
-		mutex_unlock(&mddev->open_mutex);
-		mddev->changed = 1;
-		revalidate_disk(disk);
-
-		if (mddev->ro)
-			mddev->ro = 0;
-	} else
-		mutex_unlock(&mddev->open_mutex);
-	/*
-	 * Free resources if final stop
-	 */
-	if (mode == 0) {
-		printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
-
-		bitmap_destroy(mddev);
-		if (mddev->bitmap_info.file) {
-			restore_bitmap_write_access(mddev->bitmap_info.file);
-			fput(mddev->bitmap_info.file);
-			mddev->bitmap_info.file = NULL;
-		}
-		mddev->bitmap_info.offset = 0;
-
-		export_array(mddev);
-
-		md_clean(mddev);
-		kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
-		if (mddev->hold_active == UNTIL_STOP)
-			mddev->hold_active = 0;
-	}
-	blk_integrity_unregister(disk);
-	md_new_event(mddev);
-	sysfs_notify_dirent_safe(mddev->sysfs_state);
-	return 0;
-}
-
-#ifndef MODULE
-static void autorun_array(struct mddev *mddev)
-{
-	struct md_rdev *rdev;
-	int err;
-
-	if (list_empty(&mddev->disks))
-		return;
-
-	printk(KERN_INFO "md: running: ");
-
-	rdev_for_each(rdev, mddev) {
-		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, 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 md_rdev *rdev0, *rdev, *tmp;
-	struct mddev *mddev;
-	char b[BDEVNAME_SIZE];
-
-	printk(KERN_INFO "md: autorun ...\n");
-	while (!list_empty(&pending_raid_disks)) {
-		int unit;
-		dev_t dev;
-		LIST_HEAD(candidates);
-		rdev0 = list_entry(pending_raid_disks.next,
-					 struct md_rdev, same_set);
-
-		printk(KERN_INFO "md: considering %s ...\n",
-			bdevname(rdev0->bdev,b));
-		INIT_LIST_HEAD(&candidates);
-		rdev_for_each_list(rdev, tmp, &pending_raid_disks)
-			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 (part) {
-			dev = MKDEV(mdp_major,
-				    rdev0->preferred_minor << MdpMinorShift);
-			unit = MINOR(dev) >> MdpMinorShift;
-		} else {
-			dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
-			unit = MINOR(dev);
-		}
-		if (rdev0->preferred_minor != unit) {
-			printk(KERN_INFO "md: unit number in %s is bad: %d\n",
-			       bdevname(rdev0->bdev, b), rdev0->preferred_minor);
-			break;
-		}
-
-		md_probe(dev, NULL, NULL);
-		mddev = mddev_find(dev);
-		if (!mddev || !mddev->gendisk) {
-			if (mddev)
-				mddev_put(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));
-			mddev->persistent = 1;
-			rdev_for_each_list(rdev, tmp, &candidates) {
-				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...
-		 */
-		rdev_for_each_list(rdev, tmp, &candidates) {
-			list_del_init(&rdev->same_set);
-			export_rdev(rdev);
-		}
-		mddev_put(mddev);
-	}
-	printk(KERN_INFO "md: ... autorun DONE.\n");
-}
-#endif /* !MODULE */
-
-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(struct mddev * mddev, void __user * arg)
-{
-	mdu_array_info_t info;
-	int nr,working,insync,failed,spare;
-	struct md_rdev *rdev;
-
-	nr=working=insync=failed=spare=0;
-	rdev_for_each(rdev, mddev) {
-		nr++;
-		if (test_bit(Faulty, &rdev->flags))
-			failed++;
-		else {
-			working++;
-			if (test_bit(In_sync, &rdev->flags))
-				insync++;	
-			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->dev_sectors / 2;
-	if (info.size != mddev->dev_sectors / 2) /* overflow */
-		info.size = -1;
-	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);
-	if (mddev->bitmap && mddev->bitmap_info.offset)
-		info.state = (1<<MD_SB_BITMAP_PRESENT);
-	info.active_disks  = insync;
-	info.working_disks = working;
-	info.failed_disks  = failed;
-	info.spare_disks   = spare;
-
-	info.layout        = mddev->layout;
-	info.chunk_size    = mddev->chunk_sectors << 9;
-
-	if (copy_to_user(arg, &info, sizeof(info)))
-		return -EFAULT;
-
-	return 0;
-}
-
-static int get_bitmap_file(struct mddev * mddev, void __user * arg)
-{
-	mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
-	char *ptr, *buf = NULL;
-	int err = -ENOMEM;
-
-	if (md_allow_write(mddev))
-		file = kmalloc(sizeof(*file), GFP_NOIO);
-	else
-		file = kmalloc(sizeof(*file), GFP_KERNEL);
-
-	if (!file)
-		goto out;
-
-	/* bitmap disabled, zero the first byte and copy out */
-	if (!mddev->bitmap || !mddev->bitmap->file) {
-		file->pathname[0] = '\0';
-		goto copy_out;
-	}
-
-	buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
-	if (!buf)
-		goto out;
-
-	ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
-	if (IS_ERR(ptr))
-		goto out;
-
-	strcpy(file->pathname, ptr);
-
-copy_out:
-	err = 0;
-	if (copy_to_user(arg, file, sizeof(*file)))
-		err = -EFAULT;
-out:
-	kfree(buf);
-	kfree(file);
-	return err;
-}
-
-static int get_disk_info(struct mddev * mddev, void __user * arg)
-{
-	mdu_disk_info_t info;
-	struct md_rdev *rdev;
-
-	if (copy_from_user(&info, arg, sizeof(info)))
-		return -EFAULT;
-
-	rdev = find_rdev_nr(mddev, info.number);
-	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 (test_bit(Faulty, &rdev->flags))
-			info.state |= (1<<MD_DISK_FAULTY);
-		else if (test_bit(In_sync, &rdev->flags)) {
-			info.state |= (1<<MD_DISK_ACTIVE);
-			info.state |= (1<<MD_DISK_SYNC);
-		}
-		if (test_bit(WriteMostly, &rdev->flags))
-			info.state |= (1<<MD_DISK_WRITEMOSTLY);
-	} 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(struct mddev * mddev, mdu_disk_info_t *info)
-{
-	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
-	struct md_rdev *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)) {
-			struct md_rdev *rdev0
-				= list_entry(mddev->disks.next,
-					     struct md_rdev, same_set);
-			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;
-		}
-		if (mddev->persistent)
-			rdev = md_import_device(dev, mddev->major_version,
-						mddev->minor_version);
-		else
-			rdev = md_import_device(dev, -1, -1);
-		if (IS_ERR(rdev)) {
-			printk(KERN_WARNING 
-				"md: md_import_device returned %ld\n",
-				PTR_ERR(rdev));
-			return PTR_ERR(rdev);
-		}
-		/* set saved_raid_disk if appropriate */
-		if (!mddev->persistent) {
-			if (info->state & (1<<MD_DISK_SYNC)  &&
-			    info->raid_disk < mddev->raid_disks) {
-				rdev->raid_disk = info->raid_disk;
-				set_bit(In_sync, &rdev->flags);
-			} else
-				rdev->raid_disk = -1;
-		} else
-			super_types[mddev->major_version].
-				validate_super(mddev, rdev);
-		if ((info->state & (1<<MD_DISK_SYNC)) &&
-		    (!test_bit(In_sync, &rdev->flags) ||
-		     rdev->raid_disk != info->raid_disk)) {
-			/* This was a hot-add request, but events doesn't
-			 * match, so reject it.
-			 */
-			export_rdev(rdev);
-			return -EINVAL;
-		}
-
-		if (test_bit(In_sync, &rdev->flags))
-			rdev->saved_raid_disk = rdev->raid_disk;
-		else
-			rdev->saved_raid_disk = -1;
-
-		clear_bit(In_sync, &rdev->flags); /* just to be sure */
-		if (info->state & (1<<MD_DISK_WRITEMOSTLY))
-			set_bit(WriteMostly, &rdev->flags);
-		else
-			clear_bit(WriteMostly, &rdev->flags);
-
-		rdev->raid_disk = -1;
-		err = bind_rdev_to_array(rdev, mddev);
-		if (!err && !mddev->pers->hot_remove_disk) {
-			/* If there is hot_add_disk but no hot_remove_disk
-			 * then added disks for geometry changes,
-			 * and should be added immediately.
-			 */
-			super_types[mddev->major_version].
-				validate_super(mddev, rdev);
-			err = mddev->pers->hot_add_disk(mddev, rdev);
-			if (err)
-				unbind_rdev_from_array(rdev);
-		}
-		if (err)
-			export_rdev(rdev);
-		else
-			sysfs_notify_dirent_safe(rdev->sysfs_state);
-
-		md_update_sb(mddev, 1);
-		if (mddev->degraded)
-			set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
-		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-		if (!err)
-			md_new_event(mddev);
-		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;
-
-		if (rdev->raid_disk < mddev->raid_disks)
-			if (info->state & (1<<MD_DISK_SYNC))
-				set_bit(In_sync, &rdev->flags);
-
-		if (info->state & (1<<MD_DISK_WRITEMOSTLY))
-			set_bit(WriteMostly, &rdev->flags);
-
-		if (!mddev->persistent) {
-			printk(KERN_INFO "md: nonpersistent superblock ...\n");
-			rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
-		} else
-			rdev->sb_start = calc_dev_sboffset(rdev);
-		rdev->sectors = rdev->sb_start;
-
-		err = bind_rdev_to_array(rdev, mddev);
-		if (err) {
-			export_rdev(rdev);
-			return err;
-		}
-	}
-
-	return 0;
-}
-
-static int hot_remove_disk(struct mddev * mddev, dev_t dev)
-{
-	char b[BDEVNAME_SIZE];
-	struct md_rdev *rdev;
-
-	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, 1);
-	md_new_event(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(struct mddev * mddev, dev_t dev)
-{
-	char b[BDEVNAME_SIZE];
-	int err;
-	struct md_rdev *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_start = calc_dev_sboffset(rdev);
-	else
-		rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
-
-	rdev->sectors = rdev->sb_start;
-
-	if (test_bit(Faulty, &rdev->flags)) {
-		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;
-	}
-	clear_bit(In_sync, &rdev->flags);
-	rdev->desc_nr = -1;
-	rdev->saved_raid_disk = -1;
-	err = bind_rdev_to_array(rdev, mddev);
-	if (err)
-		goto abort_export;
-
-	/*
-	 * The rest should better be atomic, we can have disk failures
-	 * noticed in interrupt contexts ...
-	 */
-
-	rdev->raid_disk = -1;
-
-	md_update_sb(mddev, 1);
-
-	/*
-	 * 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);
-	md_new_event(mddev);
-	return 0;
-
-abort_export:
-	export_rdev(rdev);
-	return err;
-}
-
-static int set_bitmap_file(struct mddev *mddev, int fd)
-{
-	int err;
-
-	if (mddev->pers) {
-		if (!mddev->pers->quiesce)
-			return -EBUSY;
-		if (mddev->recovery || mddev->sync_thread)
-			return -EBUSY;
-		/* we should be able to change the bitmap.. */
-	}
-
-
-	if (fd >= 0) {
-		if (mddev->bitmap)
-			return -EEXIST; /* cannot add when bitmap is present */
-		mddev->bitmap_info.file = fget(fd);
-
-		if (mddev->bitmap_info.file == NULL) {
-			printk(KERN_ERR "%s: error: failed to get bitmap file\n",
-			       mdname(mddev));
-			return -EBADF;
-		}
-
-		err = deny_bitmap_write_access(mddev->bitmap_info.file);
-		if (err) {
-			printk(KERN_ERR "%s: error: bitmap file is already in use\n",
-			       mdname(mddev));
-			fput(mddev->bitmap_info.file);
-			mddev->bitmap_info.file = NULL;
-			return err;
-		}
-		mddev->bitmap_info.offset = 0; /* file overrides offset */
-	} else if (mddev->bitmap == NULL)
-		return -ENOENT; /* cannot remove what isn't there */
-	err = 0;
-	if (mddev->pers) {
-		mddev->pers->quiesce(mddev, 1);
-		if (fd >= 0) {
-			err = bitmap_create(mddev);
-			if (!err)
-				err = bitmap_load(mddev);
-		}
-		if (fd < 0 || err) {
-			bitmap_destroy(mddev);
-			fd = -1; /* make sure to put the file */
-		}
-		mddev->pers->quiesce(mddev, 0);
-	}
-	if (fd < 0) {
-		if (mddev->bitmap_info.file) {
-			restore_bitmap_write_access(mddev->bitmap_info.file);
-			fput(mddev->bitmap_info.file);
-		}
-		mddev->bitmap_info.file = NULL;
-	}
-
-	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(struct mddev * 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 >= ARRAY_SIZE(super_types) ||
-		    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;
-		mddev->persistent = !info->not_persistent;
-		/* ensure mddev_put doesn't delete this now that there
-		 * is some minimal configuration.
-		 */
-		mddev->ctime         = get_seconds();
-		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->clevel[0]     = 0;
-	mddev->dev_sectors   = 2 * (sector_t)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->external	     = 0;
-
-	mddev->layout        = info->layout;
-	mddev->chunk_sectors = info->chunk_size >> 9;
-
-	mddev->max_disks     = MD_SB_DISKS;
-
-	if (mddev->persistent)
-		mddev->flags         = 0;
-	set_bit(MD_CHANGE_DEVS, &mddev->flags);
-
-	mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;
-	mddev->bitmap_info.offset = 0;
-
-	mddev->reshape_position = MaxSector;
-
-	/*
-	 * Generate a 128 bit UUID
-	 */
-	get_random_bytes(mddev->uuid, 16);
-
-	mddev->new_level = mddev->level;
-	mddev->new_chunk_sectors = mddev->chunk_sectors;
-	mddev->new_layout = mddev->layout;
-	mddev->delta_disks = 0;
-
-	return 0;
-}
-
-void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors)
-{
-	WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
-
-	if (mddev->external_size)
-		return;
-
-	mddev->array_sectors = array_sectors;
-}
-EXPORT_SYMBOL(md_set_array_sectors);
-
-static int update_size(struct mddev *mddev, sector_t num_sectors)
-{
-	struct md_rdev *rdev;
-	int rv;
-	int fit = (num_sectors == 0);
-
-	if (mddev->pers->resize == NULL)
-		return -EINVAL;
-	/* The "num_sectors" is the number of sectors 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 this number if no resync or reconstruction is
-	 * happening, and if the new size is acceptable. It must fit before the
-	 * sb_start or, if that is <data_offset, it must fit before the size
-	 * of each device.  If num_sectors is zero, we find the largest size
-	 * that fits.
-	 */
-	if (mddev->sync_thread)
-		return -EBUSY;
-	if (mddev->bitmap)
-		/* Sorry, cannot grow a bitmap yet, just remove it,
-		 * grow, and re-add.
-		 */
-		return -EBUSY;
-	rdev_for_each(rdev, mddev) {
-		sector_t avail = rdev->sectors;
-
-		if (fit && (num_sectors == 0 || num_sectors > avail))
-			num_sectors = avail;
-		if (avail < num_sectors)
-			return -ENOSPC;
-	}
-	rv = mddev->pers->resize(mddev, num_sectors);
-	if (!rv)
-		revalidate_disk(mddev->gendisk);
-	return rv;
-}
-
-static int update_raid_disks(struct mddev *mddev, int raid_disks)
-{
-	int rv;
-	/* change the number of raid disks */
-	if (mddev->pers->check_reshape == NULL)
-		return -EINVAL;
-	if (raid_disks <= 0 ||
-	    (mddev->max_disks && raid_disks >= mddev->max_disks))
-		return -EINVAL;
-	if (mddev->sync_thread || mddev->reshape_position != MaxSector)
-		return -EBUSY;
-	mddev->delta_disks = raid_disks - mddev->raid_disks;
-
-	rv = mddev->pers->check_reshape(mddev);
-	if (rv < 0)
-		mddev->delta_disks = 0;
-	return rv;
-}
-
-
-/*
- * 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(struct mddev *mddev, mdu_array_info_t *info)
-{
-	int rv = 0;
-	int cnt = 0;
-	int state = 0;
-
-	/* calculate expected state,ignoring low bits */
-	if (mddev->bitmap && mddev->bitmap_info.offset)
-		state |= (1 << MD_SB_BITMAP_PRESENT);
-
-	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_sectors != info->chunk_size >> 9 ||
-	    /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
-	    ((state^info->state) & 0xfffffe00)
-		)
-		return -EINVAL;
-	/* Check there is only one change */
-	if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
-		cnt++;
-	if (mddev->raid_disks != info->raid_disks)
-		cnt++;
-	if (mddev->layout != info->layout)
-		cnt++;
-	if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
-		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->check_reshape == NULL)
-			return -EINVAL;
-		else {
-			mddev->new_layout = info->layout;
-			rv = mddev->pers->check_reshape(mddev);
-			if (rv)
-				mddev->new_layout = mddev->layout;
-			return rv;
-		}
-	}
-	if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
-		rv = update_size(mddev, (sector_t)info->size * 2);
-
-	if (mddev->raid_disks    != info->raid_disks)
-		rv = update_raid_disks(mddev, info->raid_disks);
-
-	if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
-		if (mddev->pers->quiesce == NULL)
-			return -EINVAL;
-		if (mddev->recovery || mddev->sync_thread)
-			return -EBUSY;
-		if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
-			/* add the bitmap */
-			if (mddev->bitmap)
-				return -EEXIST;
-			if (mddev->bitmap_info.default_offset == 0)
-				return -EINVAL;
-			mddev->bitmap_info.offset =
-				mddev->bitmap_info.default_offset;
-			mddev->pers->quiesce(mddev, 1);
-			rv = bitmap_create(mddev);
-			if (!rv)
-				rv = bitmap_load(mddev);
-			if (rv)
-				bitmap_destroy(mddev);
-			mddev->pers->quiesce(mddev, 0);
-		} else {
-			/* remove the bitmap */
-			if (!mddev->bitmap)
-				return -ENOENT;
-			if (mddev->bitmap->file)
-				return -EINVAL;
-			mddev->pers->quiesce(mddev, 1);
-			bitmap_destroy(mddev);
-			mddev->pers->quiesce(mddev, 0);
-			mddev->bitmap_info.offset = 0;
-		}
-	}
-	md_update_sb(mddev, 1);
-	return rv;
-}
-
-static int set_disk_faulty(struct mddev *mddev, dev_t dev)
-{
-	struct md_rdev *rdev;
-
-	if (mddev->pers == NULL)
-		return -ENODEV;
-
-	rdev = find_rdev(mddev, dev);
-	if (!rdev)
-		return -ENODEV;
-
-	md_error(mddev, rdev);
-	if (!test_bit(Faulty, &rdev->flags))
-		return -EBUSY;
-	return 0;
-}
-
-/*
- * 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... ;-)
- */
-static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
-{
-	struct mddev *mddev = bdev->bd_disk->private_data;
-
-	geo->heads = 2;
-	geo->sectors = 4;
-	geo->cylinders = mddev->array_sectors / 8;
-	return 0;
-}
-
-static int md_ioctl(struct block_device *bdev, fmode_t mode,
-			unsigned int cmd, unsigned long arg)
-{
-	int err = 0;
-	void __user *argp = (void __user *)arg;
-	struct mddev *mddev = NULL;
-	int ro;
-
-	switch (cmd) {
-	case RAID_VERSION:
-	case GET_ARRAY_INFO:
-	case GET_DISK_INFO:
-		break;
-	default:
-		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 = bdev->bd_disk->private_data;
-
-	if (!mddev) {
-		BUG();
-		goto abort;
-	}
-
-	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 not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
-	 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
-	if ((!mddev->raid_disks && !mddev->external)
-	    && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
-	    && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
-	    && cmd != GET_BITMAP_FILE) {
-		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_BITMAP_FILE:
-			err = get_bitmap_file(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, 1);
-			goto done_unlock;
-
-		case STOP_ARRAY_RO:
-			err = md_set_readonly(mddev, 1);
-			goto done_unlock;
-
-		case BLKROSET:
-			if (get_user(ro, (int __user *)(arg))) {
-				err = -EFAULT;
-				goto done_unlock;
-			}
-			err = -EINVAL;
-
-			/* if the bdev is going readonly the value of mddev->ro
-			 * does not matter, no writes are coming
-			 */
-			if (ro)
-				goto done_unlock;
-
-			/* are we are already prepared for writes? */
-			if (mddev->ro != 1)
-				goto done_unlock;
-
-			/* transitioning to readauto need only happen for
-			 * arrays that call md_write_start
-			 */
-			if (mddev->pers) {
-				err = restart_array(mddev);
-				if (err == 0) {
-					mddev->ro = 2;
-					set_disk_ro(mddev->gendisk, 0);
-				}
-			}
-			goto done_unlock;
-	}
-
-	/*
-	 * The remaining ioctls are changing the state of the
-	 * superblock, so we do not allow them on read-only arrays.
-	 * However non-MD ioctls (e.g. get-size) will still come through
-	 * here and hit the 'default' below, so only disallow
-	 * 'md' ioctls, and switch to rw mode if started auto-readonly.
-	 */
-	if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
-		if (mddev->ro == 2) {
-			mddev->ro = 0;
-			sysfs_notify_dirent_safe(mddev->sysfs_state);
-			set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-			md_wakeup_thread(mddev->thread);
-		} else {
-			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;
-
-		case SET_BITMAP_FILE:
-			err = set_bitmap_file(mddev, (int)arg);
-			goto done_unlock;
-
-		default:
-			err = -EINVAL;
-			goto abort_unlock;
-	}
-
-done_unlock:
-abort_unlock:
-	if (mddev->hold_active == UNTIL_IOCTL &&
-	    err != -EINVAL)
-		mddev->hold_active = 0;
-	mddev_unlock(mddev);
-
-	return err;
-done:
-	if (err)
-		MD_BUG();
-abort:
-	return err;
-}
-#ifdef CONFIG_COMPAT
-static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
-		    unsigned int cmd, unsigned long arg)
-{
-	switch (cmd) {
-	case HOT_REMOVE_DISK:
-	case HOT_ADD_DISK:
-	case SET_DISK_FAULTY:
-	case SET_BITMAP_FILE:
-		/* These take in integer arg, do not convert */
-		break;
-	default:
-		arg = (unsigned long)compat_ptr(arg);
-		break;
-	}
-
-	return md_ioctl(bdev, mode, cmd, arg);
-}
-#endif /* CONFIG_COMPAT */
-
-static int md_open(struct block_device *bdev, fmode_t mode)
-{
-	/*
-	 * Succeed if we can lock the mddev, which confirms that
-	 * it isn't being stopped right now.
-	 */
-	struct mddev *mddev = mddev_find(bdev->bd_dev);
-	int err;
-
-	if (mddev->gendisk != bdev->bd_disk) {
-		/* we are racing with mddev_put which is discarding this
-		 * bd_disk.
-		 */
-		mddev_put(mddev);
-		/* Wait until bdev->bd_disk is definitely gone */
-		flush_workqueue(md_misc_wq);
-		/* Then retry the open from the top */
-		return -ERESTARTSYS;
-	}
-	BUG_ON(mddev != bdev->bd_disk->private_data);
-
-	if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
-		goto out;
-
-	err = 0;
-	atomic_inc(&mddev->openers);
-	mutex_unlock(&mddev->open_mutex);
-
-	check_disk_change(bdev);
- out:
-	return err;
-}
-
-static int md_release(struct gendisk *disk, fmode_t mode)
-{
- 	struct mddev *mddev = disk->private_data;
-
-	BUG_ON(!mddev);
-	atomic_dec(&mddev->openers);
-	mddev_put(mddev);
-
-	return 0;
-}
-
-static int md_media_changed(struct gendisk *disk)
-{
-	struct mddev *mddev = disk->private_data;
-
-	return mddev->changed;
-}
-
-static int md_revalidate(struct gendisk *disk)
-{
-	struct mddev *mddev = disk->private_data;
-
-	mddev->changed = 0;
-	return 0;
-}
-static const struct block_device_operations md_fops =
-{
-	.owner		= THIS_MODULE,
-	.open		= md_open,
-	.release	= md_release,
-	.ioctl		= md_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl	= md_compat_ioctl,
-#endif
-	.getgeo		= md_getgeo,
-	.media_changed  = md_media_changed,
-	.revalidate_disk= md_revalidate,
-};
-
-static int md_thread(void * arg)
-{
-	struct md_thread *thread = arg;
-
-	/*
-	 * 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.
-	 */
-
-	allow_signal(SIGKILL);
-	while (!kthread_should_stop()) {
-
-		/* We need to wait INTERRUPTIBLE so that
-		 * we don't add to the load-average.
-		 * That means we need to be sure no signals are
-		 * pending
-		 */
-		if (signal_pending(current))
-			flush_signals(current);
-
-		wait_event_interruptible_timeout
-			(thread->wqueue,
-			 test_bit(THREAD_WAKEUP, &thread->flags)
-			 || kthread_should_stop(),
-			 thread->timeout);
-
-		clear_bit(THREAD_WAKEUP, &thread->flags);
-		if (!kthread_should_stop())
-			thread->run(thread->mddev);
-	}
-
-	return 0;
-}
-
-void md_wakeup_thread(struct md_thread *thread)
-{
-	if (thread) {
-		pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm);
-		set_bit(THREAD_WAKEUP, &thread->flags);
-		wake_up(&thread->wqueue);
-	}
-}
-
-struct md_thread *md_register_thread(void (*run) (struct mddev *), struct mddev *mddev,
-				 const char *name)
-{
-	struct md_thread *thread;
-
-	thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL);
-	if (!thread)
-		return NULL;
-
-	init_waitqueue_head(&thread->wqueue);
-
-	thread->run = run;
-	thread->mddev = mddev;
-	thread->timeout = MAX_SCHEDULE_TIMEOUT;
-	thread->tsk = kthread_run(md_thread, thread,
-				  "%s_%s",
-				  mdname(thread->mddev),
-				  name ?: mddev->pers->name);
-	if (IS_ERR(thread->tsk)) {
-		kfree(thread);
-		return NULL;
-	}
-	return thread;
-}
-
-void md_unregister_thread(struct md_thread **threadp)
-{
-	struct md_thread *thread = *threadp;
-	if (!thread)
-		return;
-	pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
-	/* Locking ensures that mddev_unlock does not wake_up a
-	 * non-existent thread
-	 */
-	spin_lock(&pers_lock);
-	*threadp = NULL;
-	spin_unlock(&pers_lock);
-
-	kthread_stop(thread->tsk);
-	kfree(thread);
-}
-
-void md_error(struct mddev *mddev, struct md_rdev *rdev)
-{
-	if (!mddev) {
-		MD_BUG();
-		return;
-	}
-
-	if (!rdev || test_bit(Faulty, &rdev->flags))
-		return;
-
-	if (!mddev->pers || !mddev->pers->error_handler)
-		return;
-	mddev->pers->error_handler(mddev,rdev);
-	if (mddev->degraded)
-		set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
-	sysfs_notify_dirent_safe(rdev->sysfs_state);
-	set_bit(MD_RECOVERY_INTR, &mddev->recovery);
-	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-	md_wakeup_thread(mddev->thread);
-	if (mddev->event_work.func)
-		queue_work(md_misc_wq, &mddev->event_work);
-	md_new_event_inintr(mddev);
-}
-
-/* seq_file implementation /proc/mdstat */
-
-static void status_unused(struct seq_file *seq)
-{
-	int i = 0;
-	struct md_rdev *rdev;
-
-	seq_printf(seq, "unused devices: ");
-
-	list_for_each_entry(rdev, &pending_raid_disks, same_set) {
-		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, struct mddev * mddev)
-{
-	sector_t max_sectors, resync, res;
-	unsigned long dt, db;
-	sector_t rt;
-	int scale;
-	unsigned int per_milli;
-
-	resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
-
-	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
-		max_sectors = mddev->resync_max_sectors;
-	else
-		max_sectors = mddev->dev_sectors;
-
-	/*
-	 * Should not happen.
-	 */
-	if (!max_sectors) {
-		MD_BUG();
-		return;
-	}
-	/* Pick 'scale' such that (resync>>scale)*1000 will fit
-	 * in a sector_t, and (max_sectors>>scale) will fit in a
-	 * u32, as those are the requirements for sector_div.
-	 * Thus 'scale' must be at least 10
-	 */
-	scale = 10;
-	if (sizeof(sector_t) > sizeof(unsigned long)) {
-		while ( max_sectors/2 > (1ULL<<(scale+32)))
-			scale++;
-	}
-	res = (resync>>scale)*1000;
-	sector_div(res, (u32)((max_sectors>>scale)+1));
-
-	per_milli = res;
-	{
-		int i, x = per_milli/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 =%3u.%u%% (%llu/%llu)",
-		   (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
-		    "reshape" :
-		    (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
-		     "check" :
-		     (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
-		      "resync" : "recovery"))),
-		   per_milli/10, per_milli % 10,
-		   (unsigned long long) resync/2,
-		   (unsigned long long) max_sectors/2);
-
-	/*
-	 * dt: time from mark until now
-	 * db: blocks written from mark until now
-	 * rt: remaining time
-	 *
-	 * rt is a sector_t, so could be 32bit or 64bit.
-	 * So we divide before multiply in case it is 32bit and close
-	 * to the limit.
-	 * We scale the divisor (db) by 32 to avoid losing precision
-	 * near the end of resync when the number of remaining sectors
-	 * is close to 'db'.
-	 * We then divide rt by 32 after multiplying by db to compensate.
-	 * The '+1' avoids division by zero if db is very small.
-	 */
-	dt = ((jiffies - mddev->resync_mark) / HZ);
-	if (!dt) dt++;
-	db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
-		- mddev->resync_mark_cnt;
-
-	rt = max_sectors - resync;    /* number of remaining sectors */
-	sector_div(rt, db/32+1);
-	rt *= dt;
-	rt >>= 5;
-
-	seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
-		   ((unsigned long)rt % 60)/6);
-
-	seq_printf(seq, " speed=%ldK/sec", db/2/dt);
-}
-
-static void *md_seq_start(struct seq_file *seq, loff_t *pos)
-{
-	struct list_head *tmp;
-	loff_t l = *pos;
-	struct mddev *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, struct mddev, 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;
-	struct mddev *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,struct mddev,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)
-{
-	struct mddev *mddev = v;
-
-	if (mddev && v != (void*)1 && v != (void*)2)
-		mddev_put(mddev);
-}
-
-static int md_seq_show(struct seq_file *seq, void *v)
-{
-	struct mddev *mddev = v;
-	sector_t sectors;
-	struct md_rdev *rdev;
-
-	if (v == (void*)1) {
-		struct md_personality *pers;
-		seq_printf(seq, "Personalities : ");
-		spin_lock(&pers_lock);
-		list_for_each_entry(pers, &pers_list, list)
-			seq_printf(seq, "[%s] ", pers->name);
-
-		spin_unlock(&pers_lock);
-		seq_printf(seq, "\n");
-		seq->poll_event = atomic_read(&md_event_count);
-		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==1)
-				seq_printf(seq, " (read-only)");
-			if (mddev->ro==2)
-				seq_printf(seq, " (auto-read-only)");
-			seq_printf(seq, " %s", mddev->pers->name);
-		}
-
-		sectors = 0;
-		rdev_for_each(rdev, mddev) {
-			char b[BDEVNAME_SIZE];
-			seq_printf(seq, " %s[%d]",
-				bdevname(rdev->bdev,b), rdev->desc_nr);
-			if (test_bit(WriteMostly, &rdev->flags))
-				seq_printf(seq, "(W)");
-			if (test_bit(Faulty, &rdev->flags)) {
-				seq_printf(seq, "(F)");
-				continue;
-			}
-			if (rdev->raid_disk < 0)
-				seq_printf(seq, "(S)"); /* spare */
-			if (test_bit(Replacement, &rdev->flags))
-				seq_printf(seq, "(R)");
-			sectors += rdev->sectors;
-		}
-
-		if (!list_empty(&mddev->disks)) {
-			if (mddev->pers)
-				seq_printf(seq, "\n      %llu blocks",
-					   (unsigned long long)
-					   mddev->array_sectors / 2);
-			else
-				seq_printf(seq, "\n      %llu blocks",
-					   (unsigned long long)sectors / 2);
-		}
-		if (mddev->persistent) {
-			if (mddev->major_version != 0 ||
-			    mddev->minor_version != 90) {
-				seq_printf(seq," super %d.%d",
-					   mddev->major_version,
-					   mddev->minor_version);
-			}
-		} else if (mddev->external)
-			seq_printf(seq, " super external:%s",
-				   mddev->metadata_type);
-		else
-			seq_printf(seq, " super non-persistent");
-
-		if (mddev->pers) {
-			mddev->pers->status(seq, mddev);
-	 		seq_printf(seq, "\n      ");
-			if (mddev->pers->sync_request) {
-				if (mddev->curr_resync > 2) {
-					status_resync(seq, mddev);
-					seq_printf(seq, "\n      ");
-				} else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
-					seq_printf(seq, "\tresync=DELAYED\n      ");
-				else if (mddev->recovery_cp < MaxSector)
-					seq_printf(seq, "\tresync=PENDING\n      ");
-			}
-		} else
-			seq_printf(seq, "\n       ");
-
-		bitmap_status(seq, mddev->bitmap);
-
-		seq_printf(seq, "\n");
-	}
-	mddev_unlock(mddev);
-	
-	return 0;
-}
-
-static const 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)
-{
-	struct seq_file *seq;
-	int error;
-
-	error = seq_open(file, &md_seq_ops);
-	if (error)
-		return error;
-
-	seq = file->private_data;
-	seq->poll_event = atomic_read(&md_event_count);
-	return error;
-}
-
-static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
-{
-	struct seq_file *seq = filp->private_data;
-	int mask;
-
-	poll_wait(filp, &md_event_waiters, wait);
-
-	/* always allow read */
-	mask = POLLIN | POLLRDNORM;
-
-	if (seq->poll_event != atomic_read(&md_event_count))
-		mask |= POLLERR | POLLPRI;
-	return mask;
-}
-
-static const struct file_operations md_seq_fops = {
-	.owner		= THIS_MODULE,
-	.open           = md_seq_open,
-	.read           = seq_read,
-	.llseek         = seq_lseek,
-	.release	= seq_release_private,
-	.poll		= mdstat_poll,
-};
-
-int register_md_personality(struct md_personality *p)
-{
-	spin_lock(&pers_lock);
-	list_add_tail(&p->list, &pers_list);
-	printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
-	spin_unlock(&pers_lock);
-	return 0;
-}
-
-int unregister_md_personality(struct md_personality *p)
-{
-	printk(KERN_INFO "md: %s personality unregistered\n", p->name);
-	spin_lock(&pers_lock);
-	list_del_init(&p->list);
-	spin_unlock(&pers_lock);
-	return 0;
-}
-
-static int is_mddev_idle(struct mddev *mddev, int init)
-{
-	struct md_rdev * rdev;
-	int idle;
-	int curr_events;
-
-	idle = 1;
-	rcu_read_lock();
-	rdev_for_each_rcu(rdev, mddev) {
-		struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
-		curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
-			      (int)part_stat_read(&disk->part0, sectors[1]) -
-			      atomic_read(&disk->sync_io);
-		/* sync IO will cause sync_io to increase before the disk_stats
-		 * as sync_io is counted when a request starts, and
-		 * disk_stats is counted when it completes.
-		 * So resync activity will cause curr_events to be smaller than
-		 * when there was no such activity.
-		 * non-sync IO will cause disk_stat to increase without
-		 * increasing sync_io so curr_events will (eventually)
-		 * be larger than it was before.  Once it becomes
-		 * substantially larger, the test below will cause
-		 * the array to appear non-idle, and resync will slow
-		 * down.
-		 * If there is a lot of outstanding resync activity when
-		 * we set last_event to curr_events, then all that activity
-		 * completing might cause the array to appear non-idle
-		 * and resync will be slowed down even though there might
-		 * not have been non-resync activity.  This will only
-		 * happen once though.  'last_events' will soon reflect
-		 * the state where there is little or no outstanding
-		 * resync requests, and further resync activity will
-		 * always make curr_events less than last_events.
-		 *
-		 */
-		if (init || curr_events - rdev->last_events > 64) {
-			rdev->last_events = curr_events;
-			idle = 0;
-		}
-	}
-	rcu_read_unlock();
-	return idle;
-}
-
-void md_done_sync(struct mddev *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_INTR, &mddev->recovery);
-		md_wakeup_thread(mddev->thread);
-		// stop recovery, signal do_sync ....
-	}
-}
-
-
-/* md_write_start(mddev, bi)
- * If we need to update some array metadata (e.g. 'active' flag
- * in superblock) before writing, schedule a superblock update
- * and wait for it to complete.
- */
-void md_write_start(struct mddev *mddev, struct bio *bi)
-{
-	int did_change = 0;
-	if (bio_data_dir(bi) != WRITE)
-		return;
-
-	BUG_ON(mddev->ro == 1);
-	if (mddev->ro == 2) {
-		/* need to switch to read/write */
-		mddev->ro = 0;
-		set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-		md_wakeup_thread(mddev->thread);
-		md_wakeup_thread(mddev->sync_thread);
-		did_change = 1;
-	}
-	atomic_inc(&mddev->writes_pending);
-	if (mddev->safemode == 1)
-		mddev->safemode = 0;
-	if (mddev->in_sync) {
-		spin_lock_irq(&mddev->write_lock);
-		if (mddev->in_sync) {
-			mddev->in_sync = 0;
-			set_bit(MD_CHANGE_CLEAN, &mddev->flags);
-			set_bit(MD_CHANGE_PENDING, &mddev->flags);
-			md_wakeup_thread(mddev->thread);
-			did_change = 1;
-		}
-		spin_unlock_irq(&mddev->write_lock);
-	}
-	if (did_change)
-		sysfs_notify_dirent_safe(mddev->sysfs_state);
-	wait_event(mddev->sb_wait,
-		   !test_bit(MD_CHANGE_PENDING, &mddev->flags));
-}
-
-void md_write_end(struct mddev *mddev)
-{
-	if (atomic_dec_and_test(&mddev->writes_pending)) {
-		if (mddev->safemode == 2)
-			md_wakeup_thread(mddev->thread);
-		else if (mddev->safemode_delay)
-			mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
-	}
-}
-
-/* md_allow_write(mddev)
- * Calling this ensures that the array is marked 'active' so that writes
- * may proceed without blocking.  It is important to call this before
- * attempting a GFP_KERNEL allocation while holding the mddev lock.
- * Must be called with mddev_lock held.
- *
- * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
- * is dropped, so return -EAGAIN after notifying userspace.
- */
-int md_allow_write(struct mddev *mddev)
-{
-	if (!mddev->pers)
-		return 0;
-	if (mddev->ro)
-		return 0;
-	if (!mddev->pers->sync_request)
-		return 0;
-
-	spin_lock_irq(&mddev->write_lock);
-	if (mddev->in_sync) {
-		mddev->in_sync = 0;
-		set_bit(MD_CHANGE_CLEAN, &mddev->flags);
-		set_bit(MD_CHANGE_PENDING, &mddev->flags);
-		if (mddev->safemode_delay &&
-		    mddev->safemode == 0)
-			mddev->safemode = 1;
-		spin_unlock_irq(&mddev->write_lock);
-		md_update_sb(mddev, 0);
-		sysfs_notify_dirent_safe(mddev->sysfs_state);
-	} else
-		spin_unlock_irq(&mddev->write_lock);
-
-	if (test_bit(MD_CHANGE_PENDING, &mddev->flags))
-		return -EAGAIN;
-	else
-		return 0;
-}
-EXPORT_SYMBOL_GPL(md_allow_write);
-
-#define SYNC_MARKS	10
-#define	SYNC_MARK_STEP	(3*HZ)
-void md_do_sync(struct mddev *mddev)
-{
-	struct mddev *mddev2;
-	unsigned int currspeed = 0,
-		 window;
-	sector_t max_sectors,j, io_sectors;
-	unsigned long mark[SYNC_MARKS];
-	sector_t mark_cnt[SYNC_MARKS];
-	int last_mark,m;
-	struct list_head *tmp;
-	sector_t last_check;
-	int skipped = 0;
-	struct md_rdev *rdev;
-	char *desc;
-
-	/* just incase thread restarts... */
-	if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
-		return;
-	if (mddev->ro) /* never try to sync a read-only array */
-		return;
-
-	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
-		if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
-			desc = "data-check";
-		else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
-			desc = "requested-resync";
-		else
-			desc = "resync";
-	} else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
-		desc = "reshape";
-	else
-		desc = "recovery";
-
-	/* 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 (kthread_should_stop())
-			set_bit(MD_RECOVERY_INTR, &mddev->recovery);
-
-		if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
-			goto skip;
-		for_each_mddev(mddev2, tmp) {
-			if (mddev2 == mddev)
-				continue;
-			if (!mddev->parallel_resync
-			&&  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;
-				/* We need to wait 'interruptible' so as not to
-				 * contribute to the load average, and not to
-				 * be caught by 'softlockup'
-				 */
-				prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
-				if (!kthread_should_stop() &&
-				    mddev2->curr_resync >= mddev->curr_resync) {
-					printk(KERN_INFO "md: delaying %s of %s"
-					       " until %s has finished (they"
-					       " share one or more physical units)\n",
-					       desc, mdname(mddev), mdname(mddev2));
-					mddev_put(mddev2);
-					if (signal_pending(current))
-						flush_signals(current);
-					schedule();
-					finish_wait(&resync_wait, &wq);
-					goto try_again;
-				}
-				finish_wait(&resync_wait, &wq);
-			}
-		}
-	} while (mddev->curr_resync < 2);
-
-	j = 0;
-	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
-		/* resync follows the size requested by the personality,
-		 * which defaults to physical size, but can be virtual size
-		 */
-		max_sectors = mddev->resync_max_sectors;
-		mddev->resync_mismatches = 0;
-		/* we don't use the checkpoint if there's a bitmap */
-		if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
-			j = mddev->resync_min;
-		else if (!mddev->bitmap)
-			j = mddev->recovery_cp;
-
-	} else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
-		max_sectors = mddev->dev_sectors;
-	else {
-		/* recovery follows the physical size of devices */
-		max_sectors = mddev->dev_sectors;
-		j = MaxSector;
-		rcu_read_lock();
-		rdev_for_each_rcu(rdev, mddev)
-			if (rdev->raid_disk >= 0 &&
-			    !test_bit(Faulty, &rdev->flags) &&
-			    !test_bit(In_sync, &rdev->flags) &&
-			    rdev->recovery_offset < j)
-				j = rdev->recovery_offset;
-		rcu_read_unlock();
-	}
-
-	printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
-	printk(KERN_INFO "md: minimum _guaranteed_  speed:"
-		" %d KB/sec/disk.\n", speed_min(mddev));
-	printk(KERN_INFO "md: using maximum available idle IO bandwidth "
-	       "(but not more than %d KB/sec) for %s.\n",
-	       speed_max(mddev), desc);
-
-	is_mddev_idle(mddev, 1); /* this initializes IO event counters */
-
-	io_sectors = 0;
-	for (m = 0; m < SYNC_MARKS; m++) {
-		mark[m] = jiffies;
-		mark_cnt[m] = io_sectors;
-	}
-	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 %lluk.\n",
-		window/2, (unsigned long long)max_sectors/2);
-
-	atomic_set(&mddev->recovery_active, 0);
-	last_check = 0;
-
-	if (j>2) {
-		printk(KERN_INFO 
-		       "md: resuming %s of %s from checkpoint.\n",
-		       desc, mdname(mddev));
-		mddev->curr_resync = j;
-	}
-	mddev->curr_resync_completed = j;
-
-	while (j < max_sectors) {
-		sector_t sectors;
-
-		skipped = 0;
-
-		if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
-		    ((mddev->curr_resync > mddev->curr_resync_completed &&
-		      (mddev->curr_resync - mddev->curr_resync_completed)
-		      > (max_sectors >> 4)) ||
-		     (j - mddev->curr_resync_completed)*2
-		     >= mddev->resync_max - mddev->curr_resync_completed
-			    )) {
-			/* time to update curr_resync_completed */
-			wait_event(mddev->recovery_wait,
-				   atomic_read(&mddev->recovery_active) == 0);
-			mddev->curr_resync_completed = j;
-			set_bit(MD_CHANGE_CLEAN, &mddev->flags);
-			sysfs_notify(&mddev->kobj, NULL, "sync_completed");
-		}
-
-		while (j >= mddev->resync_max && !kthread_should_stop()) {
-			/* As this condition is controlled by user-space,
-			 * we can block indefinitely, so use '_interruptible'
-			 * to avoid triggering warnings.
-			 */
-			flush_signals(current); /* just in case */
-			wait_event_interruptible(mddev->recovery_wait,
-						 mddev->resync_max > j
-						 || kthread_should_stop());
-		}
-
-		if (kthread_should_stop())
-			goto interrupted;
-
-		sectors = mddev->pers->sync_request(mddev, j, &skipped,
-						  currspeed < speed_min(mddev));
-		if (sectors == 0) {
-			set_bit(MD_RECOVERY_INTR, &mddev->recovery);
-			goto out;
-		}
-
-		if (!skipped) { /* actual IO requested */
-			io_sectors += sectors;
-			atomic_add(sectors, &mddev->recovery_active);
-		}
-
-		if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
-			break;
-
-		j += sectors;
-		if (j>1) mddev->curr_resync = j;
-		mddev->curr_mark_cnt = io_sectors;
-		if (last_check == 0)
-			/* this is the earliest that rebuild will be
-			 * visible in /proc/mdstat
-			 */
-			md_new_event(mddev);
-
-		if (last_check + window > io_sectors || j == max_sectors)
-			continue;
-
-		last_check = io_sectors;
-	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] = io_sectors - atomic_read(&mddev->recovery_active);
-			last_mark = next;
-		}
-
-
-		if (kthread_should_stop())
-			goto interrupted;
-
-
-		/*
-		 * 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)
-		 */
-		cond_resched();
-
-		currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
-			/((jiffies-mddev->resync_mark)/HZ +1) +1;
-
-		if (currspeed > speed_min(mddev)) {
-			if ((currspeed > speed_max(mddev)) ||
-					!is_mddev_idle(mddev, 0)) {
-				msleep(500);
-				goto repeat;
-			}
-		}
-	}
-	printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
-	/*
-	 * this also signals 'finished resyncing' to md_stop
-	 */
- out:
-	wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
-
-	/* tell personality that we are finished */
-	mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
-
-	if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
-	    mddev->curr_resync > 2) {
-		if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
-			if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
-				if (mddev->curr_resync >= mddev->recovery_cp) {
-					printk(KERN_INFO
-					       "md: checkpointing %s of %s.\n",
-					       desc, mdname(mddev));
-					mddev->recovery_cp =
-						mddev->curr_resync_completed;
-				}
-			} else
-				mddev->recovery_cp = MaxSector;
-		} else {
-			if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
-				mddev->curr_resync = MaxSector;
-			rcu_read_lock();
-			rdev_for_each_rcu(rdev, mddev)
-				if (rdev->raid_disk >= 0 &&
-				    mddev->delta_disks >= 0 &&
-				    !test_bit(Faulty, &rdev->flags) &&
-				    !test_bit(In_sync, &rdev->flags) &&
-				    rdev->recovery_offset < mddev->curr_resync)
-					rdev->recovery_offset = mddev->curr_resync;
-			rcu_read_unlock();
-		}
-	}
- skip:
-	set_bit(MD_CHANGE_DEVS, &mddev->flags);
-
-	if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
-		/* We completed so min/max setting can be forgotten if used. */
-		if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
-			mddev->resync_min = 0;
-		mddev->resync_max = MaxSector;
-	} else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
-		mddev->resync_min = mddev->curr_resync_completed;
-	mddev->curr_resync = 0;
-	wake_up(&resync_wait);
-	set_bit(MD_RECOVERY_DONE, &mddev->recovery);
-	md_wakeup_thread(mddev->thread);
-	return;
-
- interrupted:
-	/*
-	 * got a signal, exit.
-	 */
-	printk(KERN_INFO
-	       "md: md_do_sync() got signal ... exiting\n");
-	set_bit(MD_RECOVERY_INTR, &mddev->recovery);
-	goto out;
-
-}
-EXPORT_SYMBOL_GPL(md_do_sync);
-
-static int remove_and_add_spares(struct mddev *mddev)
-{
-	struct md_rdev *rdev;
-	int spares = 0;
-	int removed = 0;
-
-	mddev->curr_resync_completed = 0;
-
-	rdev_for_each(rdev, mddev)
-		if (rdev->raid_disk >= 0 &&
-		    !test_bit(Blocked, &rdev->flags) &&
-		    (test_bit(Faulty, &rdev->flags) ||
-		     ! test_bit(In_sync, &rdev->flags)) &&
-		    atomic_read(&rdev->nr_pending)==0) {
-			if (mddev->pers->hot_remove_disk(
-				    mddev, rdev) == 0) {
-				sysfs_unlink_rdev(mddev, rdev);
-				rdev->raid_disk = -1;
-				removed++;
-			}
-		}
-	if (removed)
-		sysfs_notify(&mddev->kobj, NULL,
-			     "degraded");
-
-
-	rdev_for_each(rdev, mddev) {
-		if (rdev->raid_disk >= 0 &&
-		    !test_bit(In_sync, &rdev->flags) &&
-		    !test_bit(Faulty, &rdev->flags))
-			spares++;
-		if (rdev->raid_disk < 0
-		    && !test_bit(Faulty, &rdev->flags)) {
-			rdev->recovery_offset = 0;
-			if (mddev->pers->
-			    hot_add_disk(mddev, rdev) == 0) {
-				if (sysfs_link_rdev(mddev, rdev))
-					/* failure here is OK */;
-				spares++;
-				md_new_event(mddev);
-				set_bit(MD_CHANGE_DEVS, &mddev->flags);
-			}
-		}
-	}
-	return spares;
-}
-
-static void reap_sync_thread(struct mddev *mddev)
-{
-	struct md_rdev *rdev;
-
-	/* resync has finished, collect result */
-	md_unregister_thread(&mddev->sync_thread);
-	if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
-	    !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
-		/* success...*/
-		/* activate any spares */
-		if (mddev->pers->spare_active(mddev))
-			sysfs_notify(&mddev->kobj, NULL,
-				     "degraded");
-	}
-	if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
-	    mddev->pers->finish_reshape)
-		mddev->pers->finish_reshape(mddev);
-
-	/* If array is no-longer degraded, then any saved_raid_disk
-	 * information must be scrapped.  Also if any device is now
-	 * In_sync we must scrape the saved_raid_disk for that device
-	 * do the superblock for an incrementally recovered device
-	 * written out.
-	 */
-	rdev_for_each(rdev, mddev)
-		if (!mddev->degraded ||
-		    test_bit(In_sync, &rdev->flags))
-			rdev->saved_raid_disk = -1;
-
-	md_update_sb(mddev, 1);
-	clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
-	clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
-	clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
-	clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
-	clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
-	/* flag recovery needed just to double check */
-	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-	sysfs_notify_dirent_safe(mddev->sysfs_action);
-	md_new_event(mddev);
-	if (mddev->event_work.func)
-		queue_work(md_misc_wq, &mddev->event_work);
-}
-
-/*
- * 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 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(struct mddev *mddev)
-{
-	if (mddev->suspended)
-		return;
-
-	if (mddev->bitmap)
-		bitmap_daemon_work(mddev);
-
-	if (signal_pending(current)) {
-		if (mddev->pers->sync_request && !mddev->external) {
-			printk(KERN_INFO "md: %s in immediate safe mode\n",
-			       mdname(mddev));
-			mddev->safemode = 2;
-		}
-		flush_signals(current);
-	}
-
-	if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
-		return;
-	if ( ! (
-		(mddev->flags & ~ (1<<MD_CHANGE_PENDING)) ||
-		test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
-		test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
-		(mddev->external == 0 && mddev->safemode == 1) ||
-		(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
-		 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
-		))
-		return;
-
-	if (mddev_trylock(mddev)) {
-		int spares = 0;
-
-		if (mddev->ro) {
-			/* Only thing we do on a ro array is remove
-			 * failed devices.
-			 */
-			struct md_rdev *rdev;
-			rdev_for_each(rdev, mddev)
-				if (rdev->raid_disk >= 0 &&
-				    !test_bit(Blocked, &rdev->flags) &&
-				    test_bit(Faulty, &rdev->flags) &&
-				    atomic_read(&rdev->nr_pending)==0) {
-					if (mddev->pers->hot_remove_disk(
-						    mddev, rdev) == 0) {
-						sysfs_unlink_rdev(mddev, rdev);
-						rdev->raid_disk = -1;
-					}
-				}
-			clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
-			goto unlock;
-		}
-
-		if (!mddev->external) {
-			int did_change = 0;
-			spin_lock_irq(&mddev->write_lock);
-			if (mddev->safemode &&
-			    !atomic_read(&mddev->writes_pending) &&
-			    !mddev->in_sync &&
-			    mddev->recovery_cp == MaxSector) {
-				mddev->in_sync = 1;
-				did_change = 1;
-				set_bit(MD_CHANGE_CLEAN, &mddev->flags);
-			}
-			if (mddev->safemode == 1)
-				mddev->safemode = 0;
-			spin_unlock_irq(&mddev->write_lock);
-			if (did_change)
-				sysfs_notify_dirent_safe(mddev->sysfs_state);
-		}
-
-		if (mddev->flags)
-			md_update_sb(mddev, 0);
-
-		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) {
-			reap_sync_thread(mddev);
-			goto unlock;
-		}
-		/* Set RUNNING before clearing NEEDED to avoid
-		 * any transients in the value of "sync_action".
-		 */
-		set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
-		/* Clear some bits that don't mean anything, but
-		 * might be left set
-		 */
-		clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
-		clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
-
-		if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
-		    test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
-			goto unlock;
-		/* 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.
-		 */
-
-		if (mddev->reshape_position != MaxSector) {
-			if (mddev->pers->check_reshape == NULL ||
-			    mddev->pers->check_reshape(mddev) != 0)
-				/* Cannot proceed */
-				goto unlock;
-			set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
-			clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
-		} else if ((spares = remove_and_add_spares(mddev))) {
-			clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
-			clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
-			clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
-			set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
-		} else if (mddev->recovery_cp < MaxSector) {
-			set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
-			clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
-		} else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
-			/* nothing to be done ... */
-			goto unlock;
-
-		if (mddev->pers->sync_request) {
-			if (spares && mddev->bitmap && ! mddev->bitmap->file) {
-				/* We are adding a device or devices to an array
-				 * which has the bitmap stored on all devices.
-				 * So make sure all bitmap pages get written
-				 */
-				bitmap_write_all(mddev->bitmap);
-			}
-			mddev->sync_thread = md_register_thread(md_do_sync,
-								mddev,
-								"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 */
-				clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
-				clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
-				clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
-				clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
-				clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
-			} else
-				md_wakeup_thread(mddev->sync_thread);
-			sysfs_notify_dirent_safe(mddev->sysfs_action);
-			md_new_event(mddev);
-		}
-	unlock:
-		if (!mddev->sync_thread) {
-			clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
-			if (test_and_clear_bit(MD_RECOVERY_RECOVER,
-					       &mddev->recovery))
-				if (mddev->sysfs_action)
-					sysfs_notify_dirent_safe(mddev->sysfs_action);
-		}
-		mddev_unlock(mddev);
-	}
-}
-
-void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev)
-{
-	sysfs_notify_dirent_safe(rdev->sysfs_state);
-	wait_event_timeout(rdev->blocked_wait,
-			   !test_bit(Blocked, &rdev->flags) &&
-			   !test_bit(BlockedBadBlocks, &rdev->flags),
-			   msecs_to_jiffies(5000));
-	rdev_dec_pending(rdev, mddev);
-}
-EXPORT_SYMBOL(md_wait_for_blocked_rdev);
-
-
-/* Bad block management.
- * We can record which blocks on each device are 'bad' and so just
- * fail those blocks, or that stripe, rather than the whole device.
- * Entries in the bad-block table are 64bits wide.  This comprises:
- * Length of bad-range, in sectors: 0-511 for lengths 1-512
- * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
- *  A 'shift' can be set so that larger blocks are tracked and
- *  consequently larger devices can be covered.
- * 'Acknowledged' flag - 1 bit. - the most significant bit.
- *
- * Locking of the bad-block table uses a seqlock so md_is_badblock
- * might need to retry if it is very unlucky.
- * We will sometimes want to check for bad blocks in a bi_end_io function,
- * so we use the write_seqlock_irq variant.
- *
- * When looking for a bad block we specify a range and want to
- * know if any block in the range is bad.  So we binary-search
- * to the last range that starts at-or-before the given endpoint,
- * (or "before the sector after the target range")
- * then see if it ends after the given start.
- * We return
- *  0 if there are no known bad blocks in the range
- *  1 if there are known bad block which are all acknowledged
- * -1 if there are bad blocks which have not yet been acknowledged in metadata.
- * plus the start/length of the first bad section we overlap.
- */
-int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
-		   sector_t *first_bad, int *bad_sectors)
-{
-	int hi;
-	int lo = 0;
-	u64 *p = bb->page;
-	int rv = 0;
-	sector_t target = s + sectors;
-	unsigned seq;
-
-	if (bb->shift > 0) {
-		/* round the start down, and the end up */
-		s >>= bb->shift;
-		target += (1<<bb->shift) - 1;
-		target >>= bb->shift;
-		sectors = target - s;
-	}
-	/* 'target' is now the first block after the bad range */
-
-retry:
-	seq = read_seqbegin(&bb->lock);
-
-	hi = bb->count;
-
-	/* Binary search between lo and hi for 'target'
-	 * i.e. for the last range that starts before 'target'
-	 */
-	/* INVARIANT: ranges before 'lo' and at-or-after 'hi'
-	 * are known not to be the last range before target.
-	 * VARIANT: hi-lo is the number of possible
-	 * ranges, and decreases until it reaches 1
-	 */
-	while (hi - lo > 1) {
-		int mid = (lo + hi) / 2;
-		sector_t a = BB_OFFSET(p[mid]);
-		if (a < target)
-			/* This could still be the one, earlier ranges
-			 * could not. */
-			lo = mid;
-		else
-			/* This and later ranges are definitely out. */
-			hi = mid;
-	}
-	/* 'lo' might be the last that started before target, but 'hi' isn't */
-	if (hi > lo) {
-		/* need to check all range that end after 's' to see if
-		 * any are unacknowledged.
-		 */
-		while (lo >= 0 &&
-		       BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
-			if (BB_OFFSET(p[lo]) < target) {
-				/* starts before the end, and finishes after
-				 * the start, so they must overlap
-				 */
-				if (rv != -1 && BB_ACK(p[lo]))
-					rv = 1;
-				else
-					rv = -1;
-				*first_bad = BB_OFFSET(p[lo]);
-				*bad_sectors = BB_LEN(p[lo]);
-			}
-			lo--;
-		}
-	}
-
-	if (read_seqretry(&bb->lock, seq))
-		goto retry;
-
-	return rv;
-}
-EXPORT_SYMBOL_GPL(md_is_badblock);
-
-/*
- * Add a range of bad blocks to the table.
- * This might extend the table, or might contract it
- * if two adjacent ranges can be merged.
- * We binary-search to find the 'insertion' point, then
- * decide how best to handle it.
- */
-static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
-			    int acknowledged)
-{
-	u64 *p;
-	int lo, hi;
-	int rv = 1;
-
-	if (bb->shift < 0)
-		/* badblocks are disabled */
-		return 0;
-
-	if (bb->shift) {
-		/* round the start down, and the end up */
-		sector_t next = s + sectors;
-		s >>= bb->shift;
-		next += (1<<bb->shift) - 1;
-		next >>= bb->shift;
-		sectors = next - s;
-	}
-
-	write_seqlock_irq(&bb->lock);
-
-	p = bb->page;
-	lo = 0;
-	hi = bb->count;
-	/* Find the last range that starts at-or-before 's' */
-	while (hi - lo > 1) {
-		int mid = (lo + hi) / 2;
-		sector_t a = BB_OFFSET(p[mid]);
-		if (a <= s)
-			lo = mid;
-		else
-			hi = mid;
-	}
-	if (hi > lo && BB_OFFSET(p[lo]) > s)
-		hi = lo;
-
-	if (hi > lo) {
-		/* we found a range that might merge with the start
-		 * of our new range
-		 */
-		sector_t a = BB_OFFSET(p[lo]);
-		sector_t e = a + BB_LEN(p[lo]);
-		int ack = BB_ACK(p[lo]);
-		if (e >= s) {
-			/* Yes, we can merge with a previous range */
-			if (s == a && s + sectors >= e)
-				/* new range covers old */
-				ack = acknowledged;
-			else
-				ack = ack && acknowledged;
-
-			if (e < s + sectors)
-				e = s + sectors;
-			if (e - a <= BB_MAX_LEN) {
-				p[lo] = BB_MAKE(a, e-a, ack);
-				s = e;
-			} else {
-				/* does not all fit in one range,
-				 * make p[lo] maximal
-				 */
-				if (BB_LEN(p[lo]) != BB_MAX_LEN)
-					p[lo] = BB_MAKE(a, BB_MAX_LEN, ack);
-				s = a + BB_MAX_LEN;
-			}
-			sectors = e - s;
-		}
-	}
-	if (sectors && hi < bb->count) {
-		/* 'hi' points to the first range that starts after 's'.
-		 * Maybe we can merge with the start of that range */
-		sector_t a = BB_OFFSET(p[hi]);
-		sector_t e = a + BB_LEN(p[hi]);
-		int ack = BB_ACK(p[hi]);
-		if (a <= s + sectors) {
-			/* merging is possible */
-			if (e <= s + sectors) {
-				/* full overlap */
-				e = s + sectors;
-				ack = acknowledged;
-			} else
-				ack = ack && acknowledged;
-
-			a = s;
-			if (e - a <= BB_MAX_LEN) {
-				p[hi] = BB_MAKE(a, e-a, ack);
-				s = e;
-			} else {
-				p[hi] = BB_MAKE(a, BB_MAX_LEN, ack);
-				s = a + BB_MAX_LEN;
-			}
-			sectors = e - s;
-			lo = hi;
-			hi++;
-		}
-	}
-	if (sectors == 0 && hi < bb->count) {
-		/* we might be able to combine lo and hi */
-		/* Note: 's' is at the end of 'lo' */
-		sector_t a = BB_OFFSET(p[hi]);
-		int lolen = BB_LEN(p[lo]);
-		int hilen = BB_LEN(p[hi]);
-		int newlen = lolen + hilen - (s - a);
-		if (s >= a && newlen < BB_MAX_LEN) {
-			/* yes, we can combine them */
-			int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]);
-			p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack);
-			memmove(p + hi, p + hi + 1,
-				(bb->count - hi - 1) * 8);
-			bb->count--;
-		}
-	}
-	while (sectors) {
-		/* didn't merge (it all).
-		 * Need to add a range just before 'hi' */
-		if (bb->count >= MD_MAX_BADBLOCKS) {
-			/* No room for more */
-			rv = 0;
-			break;
-		} else {
-			int this_sectors = sectors;
-			memmove(p + hi + 1, p + hi,
-				(bb->count - hi) * 8);
-			bb->count++;
-
-			if (this_sectors > BB_MAX_LEN)
-				this_sectors = BB_MAX_LEN;
-			p[hi] = BB_MAKE(s, this_sectors, acknowledged);
-			sectors -= this_sectors;
-			s += this_sectors;
-		}
-	}
-
-	bb->changed = 1;
-	if (!acknowledged)
-		bb->unacked_exist = 1;
-	write_sequnlock_irq(&bb->lock);
-
-	return rv;
-}
-
-int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
-		       int acknowledged)
-{
-	int rv = md_set_badblocks(&rdev->badblocks,
-				  s + rdev->data_offset, sectors, acknowledged);
-	if (rv) {
-		/* Make sure they get written out promptly */
-		sysfs_notify_dirent_safe(rdev->sysfs_state);
-		set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
-		md_wakeup_thread(rdev->mddev->thread);
-	}
-	return rv;
-}
-EXPORT_SYMBOL_GPL(rdev_set_badblocks);
-
-/*
- * Remove a range of bad blocks from the table.
- * This may involve extending the table if we spilt a region,
- * but it must not fail.  So if the table becomes full, we just
- * drop the remove request.
- */
-static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
-{
-	u64 *p;
-	int lo, hi;
-	sector_t target = s + sectors;
-	int rv = 0;
-
-	if (bb->shift > 0) {
-		/* When clearing we round the start up and the end down.
-		 * This should not matter as the shift should align with
-		 * the block size and no rounding should ever be needed.
-		 * However it is better the think a block is bad when it
-		 * isn't than to think a block is not bad when it is.
-		 */
-		s += (1<<bb->shift) - 1;
-		s >>= bb->shift;
-		target >>= bb->shift;
-		sectors = target - s;
-	}
-
-	write_seqlock_irq(&bb->lock);
-
-	p = bb->page;
-	lo = 0;
-	hi = bb->count;
-	/* Find the last range that starts before 'target' */
-	while (hi - lo > 1) {
-		int mid = (lo + hi) / 2;
-		sector_t a = BB_OFFSET(p[mid]);
-		if (a < target)
-			lo = mid;
-		else
-			hi = mid;
-	}
-	if (hi > lo) {
-		/* p[lo] is the last range that could overlap the
-		 * current range.  Earlier ranges could also overlap,
-		 * but only this one can overlap the end of the range.
-		 */
-		if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) {
-			/* Partial overlap, leave the tail of this range */
-			int ack = BB_ACK(p[lo]);
-			sector_t a = BB_OFFSET(p[lo]);
-			sector_t end = a + BB_LEN(p[lo]);
-
-			if (a < s) {
-				/* we need to split this range */
-				if (bb->count >= MD_MAX_BADBLOCKS) {
-					rv = 0;
-					goto out;
-				}
-				memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
-				bb->count++;
-				p[lo] = BB_MAKE(a, s-a, ack);
-				lo++;
-			}
-			p[lo] = BB_MAKE(target, end - target, ack);
-			/* there is no longer an overlap */
-			hi = lo;
-			lo--;
-		}
-		while (lo >= 0 &&
-		       BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) {
-			/* This range does overlap */
-			if (BB_OFFSET(p[lo]) < s) {
-				/* Keep the early parts of this range. */
-				int ack = BB_ACK(p[lo]);
-				sector_t start = BB_OFFSET(p[lo]);
-				p[lo] = BB_MAKE(start, s - start, ack);
-				/* now low doesn't overlap, so.. */
-				break;
-			}
-			lo--;
-		}
-		/* 'lo' is strictly before, 'hi' is strictly after,
-		 * anything between needs to be discarded
-		 */
-		if (hi - lo > 1) {
-			memmove(p+lo+1, p+hi, (bb->count - hi) * 8);
-			bb->count -= (hi - lo - 1);
-		}
-	}
-
-	bb->changed = 1;
-out:
-	write_sequnlock_irq(&bb->lock);
-	return rv;
-}
-
-int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors)
-{
-	return md_clear_badblocks(&rdev->badblocks,
-				  s + rdev->data_offset,
-				  sectors);
-}
-EXPORT_SYMBOL_GPL(rdev_clear_badblocks);
-
-/*
- * Acknowledge all bad blocks in a list.
- * This only succeeds if ->changed is clear.  It is used by
- * in-kernel metadata updates
- */
-void md_ack_all_badblocks(struct badblocks *bb)
-{
-	if (bb->page == NULL || bb->changed)
-		/* no point even trying */
-		return;
-	write_seqlock_irq(&bb->lock);
-
-	if (bb->changed == 0 && bb->unacked_exist) {
-		u64 *p = bb->page;
-		int i;
-		for (i = 0; i < bb->count ; i++) {
-			if (!BB_ACK(p[i])) {
-				sector_t start = BB_OFFSET(p[i]);
-				int len = BB_LEN(p[i]);
-				p[i] = BB_MAKE(start, len, 1);
-			}
-		}
-		bb->unacked_exist = 0;
-	}
-	write_sequnlock_irq(&bb->lock);
-}
-EXPORT_SYMBOL_GPL(md_ack_all_badblocks);
-
-/* sysfs access to bad-blocks list.
- * We present two files.
- * 'bad-blocks' lists sector numbers and lengths of ranges that
- *    are recorded as bad.  The list is truncated to fit within
- *    the one-page limit of sysfs.
- *    Writing "sector length" to this file adds an acknowledged
- *    bad block list.
- * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
- *    been acknowledged.  Writing to this file adds bad blocks
- *    without acknowledging them.  This is largely for testing.
- */
-
-static ssize_t
-badblocks_show(struct badblocks *bb, char *page, int unack)
-{
-	size_t len;
-	int i;
-	u64 *p = bb->page;
-	unsigned seq;
-
-	if (bb->shift < 0)
-		return 0;
-
-retry:
-	seq = read_seqbegin(&bb->lock);
-
-	len = 0;
-	i = 0;
-
-	while (len < PAGE_SIZE && i < bb->count) {
-		sector_t s = BB_OFFSET(p[i]);
-		unsigned int length = BB_LEN(p[i]);
-		int ack = BB_ACK(p[i]);
-		i++;
-
-		if (unack && ack)
-			continue;
-
-		len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n",
-				(unsigned long long)s << bb->shift,
-				length << bb->shift);
-	}
-	if (unack && len == 0)
-		bb->unacked_exist = 0;
-
-	if (read_seqretry(&bb->lock, seq))
-		goto retry;
-
-	return len;
-}
-
-#define DO_DEBUG 1
-
-static ssize_t
-badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack)
-{
-	unsigned long long sector;
-	int length;
-	char newline;
-#ifdef DO_DEBUG
-	/* Allow clearing via sysfs *only* for testing/debugging.
-	 * Normally only a successful write may clear a badblock
-	 */
-	int clear = 0;
-	if (page[0] == '-') {
-		clear = 1;
-		page++;
-	}
-#endif /* DO_DEBUG */
-
-	switch (sscanf(page, "%llu %d%c", &sector, &length, &newline)) {
-	case 3:
-		if (newline != '\n')
-			return -EINVAL;
-	case 2:
-		if (length <= 0)
-			return -EINVAL;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-#ifdef DO_DEBUG
-	if (clear) {
-		md_clear_badblocks(bb, sector, length);
-		return len;
-	}
-#endif /* DO_DEBUG */
-	if (md_set_badblocks(bb, sector, length, !unack))
-		return len;
-	else
-		return -ENOSPC;
-}
-
-static int md_notify_reboot(struct notifier_block *this,
-			    unsigned long code, void *x)
-{
-	struct list_head *tmp;
-	struct mddev *mddev;
-	int need_delay = 0;
-
-	for_each_mddev(mddev, tmp) {
-		if (mddev_trylock(mddev)) {
-			if (mddev->pers)
-				__md_stop_writes(mddev);
-			mddev->safemode = 2;
-			mddev_unlock(mddev);
-		}
-		need_delay = 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 ...
-	 */
-	if (need_delay)
-		mdelay(1000*1);
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block md_notifier = {
-	.notifier_call	= md_notify_reboot,
-	.next		= NULL,
-	.priority	= INT_MAX, /* before any real devices */
-};
-
-static void md_geninit(void)
-{
-	pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
-
-	proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
-}
-
-static int __init md_init(void)
-{
-	int ret = -ENOMEM;
-
-	md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0);
-	if (!md_wq)
-		goto err_wq;
-
-	md_misc_wq = alloc_workqueue("md_misc", 0, 0);
-	if (!md_misc_wq)
-		goto err_misc_wq;
-
-	if ((ret = register_blkdev(MD_MAJOR, "md")) < 0)
-		goto err_md;
-
-	if ((ret = register_blkdev(0, "mdp")) < 0)
-		goto err_mdp;
-	mdp_major = ret;
-
-	blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
-			    md_probe, NULL, NULL);
-	blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
-			    md_probe, NULL, NULL);
-
-	register_reboot_notifier(&md_notifier);
-	raid_table_header = register_sysctl_table(raid_root_table);
-
-	md_geninit();
-	return 0;
-
-err_mdp:
-	unregister_blkdev(MD_MAJOR, "md");
-err_md:
-	destroy_workqueue(md_misc_wq);
-err_misc_wq:
-	destroy_workqueue(md_wq);
-err_wq:
-	return ret;
-}
-
-#ifndef MODULE
-
-/*
- * Searches all registered partitions for autorun RAID arrays
- * at boot time.
- */
-
-static LIST_HEAD(all_detected_devices);
-struct detected_devices_node {
-	struct list_head list;
-	dev_t dev;
-};
-
-void md_autodetect_dev(dev_t dev)
-{
-	struct detected_devices_node *node_detected_dev;
-
-	node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
-	if (node_detected_dev) {
-		node_detected_dev->dev = dev;
-		list_add_tail(&node_detected_dev->list, &all_detected_devices);
-	} else {
-		printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
-			", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
-	}
-}
-
-
-static void autostart_arrays(int part)
-{
-	struct md_rdev *rdev;
-	struct detected_devices_node *node_detected_dev;
-	dev_t dev;
-	int i_scanned, i_passed;
-
-	i_scanned = 0;
-	i_passed = 0;
-
-	printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
-
-	while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
-		i_scanned++;
-		node_detected_dev = list_entry(all_detected_devices.next,
-					struct detected_devices_node, list);
-		list_del(&node_detected_dev->list);
-		dev = node_detected_dev->dev;
-		kfree(node_detected_dev);
-		rdev = md_import_device(dev,0, 90);
-		if (IS_ERR(rdev))
-			continue;
-
-		if (test_bit(Faulty, &rdev->flags)) {
-			MD_BUG();
-			continue;
-		}
-		set_bit(AutoDetected, &rdev->flags);
-		list_add(&rdev->same_set, &pending_raid_disks);
-		i_passed++;
-	}
-
-	printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
-						i_scanned, i_passed);
-
-	autorun_devices(part);
-}
-
-#endif /* !MODULE */
-
-static __exit void md_exit(void)
-{
-	struct mddev *mddev;
-	struct list_head *tmp;
-
-	blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
-	blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
-
-	unregister_blkdev(MD_MAJOR,"md");
-	unregister_blkdev(mdp_major, "mdp");
-	unregister_reboot_notifier(&md_notifier);
-	unregister_sysctl_table(raid_table_header);
-	remove_proc_entry("mdstat", NULL);
-	for_each_mddev(mddev, tmp) {
-		export_array(mddev);
-		mddev->hold_active = 0;
-	}
-	destroy_workqueue(md_misc_wq);
-	destroy_workqueue(md_wq);
-}
-
-subsys_initcall(md_init);
-module_exit(md_exit)
-
-static int get_ro(char *buffer, struct kernel_param *kp)
-{
-	return sprintf(buffer, "%d", start_readonly);
-}
-static int set_ro(const char *val, struct kernel_param *kp)
-{
-	char *e;
-	int num = simple_strtoul(val, &e, 10);
-	if (*val && (*e == '\0' || *e == '\n')) {
-		start_readonly = num;
-		return 0;
-	}
-	return -EINVAL;
-}
-
-module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
-module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
-
-module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
-
-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_register_thread);
-EXPORT_SYMBOL(md_unregister_thread);
-EXPORT_SYMBOL(md_wakeup_thread);
-EXPORT_SYMBOL(md_check_recovery);
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("MD RAID framework");
-MODULE_ALIAS("md");
-MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);