block: change the hash used for looking up block devices

	blockdev_superblock = bd_mnt->mnt_sb;   /* For writeback */

}

/*

 * Most likely _very_ bad one - but then it's hardly critical for small

 * /dev and can be fixed when somebody will need really large one.

 * Keep in mind that it will be fed through icache hash function too.

 */

static inline unsigned long hash(dev_t dev)

{

	return MAJOR(dev)+MINOR(dev);

}

static int bdev_test(struct inode *inode, void *data)

{

	return BDEV_I(inode)->bdev.bd_dev == *(dev_t *)data;

}

static int bdev_set(struct inode *inode, void *data)

{

	BDEV_I(inode)->bdev.bd_dev = *(dev_t *)data;

	return 0;

}

static struct block_device *bdget(dev_t dev)

{

	struct block_device *bdev;

	struct inode *inode;

	inode = iget5_locked(blockdev_superblock, hash(dev),

			bdev_test, bdev_set, &dev);

	inode = iget_locked(blockdev_superblock, dev);

	if (!inode)

		return NULL;

		bdev->bd_super = NULL;

		bdev->bd_inode = inode;

		bdev->bd_part_count = 0;

		bdev->bd_dev = dev;

		inode->i_mode = S_IFBLK;

		inode->i_rdev = dev;

		inode->i_bdev = bdev;