From: Alasdair G Kergon <agk@redhat.com>

Export blkdev_driver_ioctl for device-mapper.

If we get as far as the device-mapper ioctl handler, we know the ioctl is not
a standard block layer BLK* one, so we don't need to check for them a second
time and can call blkdev_driver_ioctl() directly.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Index: linux-2.6.18-rc7/block/ioctl.c
===================================================================
--- linux-2.6.18-rc7.orig/block/ioctl.c	2006-10-13 16:56:34.000000000 +0100
+++ linux-2.6.18-rc7/block/ioctl.c	2006-10-13 17:10:05.000000000 +0100
@@ -199,8 +199,8 @@ static int blkdev_locked_ioctl(struct fi
 	return -ENOIOCTLCMD;
 }
 
-static int blkdev_driver_ioctl(struct inode *inode, struct file *file,
-		struct gendisk *disk, unsigned cmd, unsigned long arg)
+int blkdev_driver_ioctl(struct inode *inode, struct file *file,
+			struct gendisk *disk, unsigned cmd, unsigned long arg)
 {
 	int ret;
 	if (disk->fops->unlocked_ioctl)
@@ -215,6 +215,7 @@ static int blkdev_driver_ioctl(struct in
 
 	return -ENOTTY;
 }
+EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
 
 int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
 			unsigned long arg)
Index: linux-2.6.18-rc7/drivers/md/dm-linear.c
===================================================================
--- linux-2.6.18-rc7.orig/drivers/md/dm-linear.c	2006-10-13 17:10:04.000000000 +0100
+++ linux-2.6.18-rc7/drivers/md/dm-linear.c	2006-10-13 17:10:05.000000000 +0100
@@ -105,7 +105,7 @@ static int linear_ioctl(struct dm_target
 	struct linear_c *lc = (struct linear_c *) ti->private;
 	struct block_device *bdev = lc->dev->bdev;
 
-	return blkdev_ioctl(bdev->bd_inode, filp, cmd, arg);
+	return blkdev_driver_ioctl(bdev->bd_inode, filp, bdev->bd_disk, cmd, arg);
 }
 
 static struct target_type linear_target = {
Index: linux-2.6.18-rc7/drivers/md/dm-mpath.c
===================================================================
--- linux-2.6.18-rc7.orig/drivers/md/dm-mpath.c	2006-10-13 17:10:04.000000000 +0100
+++ linux-2.6.18-rc7/drivers/md/dm-mpath.c	2006-10-13 17:10:05.000000000 +0100
@@ -1290,7 +1290,8 @@ static int multipath_ioctl(struct dm_tar
 
 	spin_unlock_irqrestore(&m->lock, flags);
 
-	return r ? : blkdev_ioctl(bdev->bd_inode, filp, cmd, arg);
+	return r ? : blkdev_driver_ioctl(bdev->bd_inode, filp, bdev->bd_disk,
+		     cmd, arg);
 }
 
 /*-----------------------------------------------------------------
Index: linux-2.6.18-rc7/include/linux/fs.h
===================================================================
--- linux-2.6.18-rc7.orig/include/linux/fs.h	2006-10-13 16:56:34.000000000 +0100
+++ linux-2.6.18-rc7/include/linux/fs.h	2006-10-13 17:10:05.000000000 +0100
@@ -1454,6 +1454,9 @@ extern const struct file_operations bad_
 extern const struct file_operations def_fifo_fops;
 extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
 extern int blkdev_ioctl(struct inode *, struct file *, unsigned, unsigned long);
+extern int blkdev_driver_ioctl(struct inode *inode, struct file *file,
+			       struct gendisk *disk, unsigned cmd,
+			       unsigned long arg);
 extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
 extern int blkdev_get(struct block_device *, mode_t, unsigned);
 extern int blkdev_put(struct block_device *);