Btrfs: remove no longer needed range length checks for deduplication

	lock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);

}

static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,

static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 len,

				   struct inode *dst, u64 dst_loff)

{

	u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;

	int ret;

	u64 len = olen;

	if (loff + len == src->i_size)

		len = ALIGN(src->i_size, bs) - loff;

	/*

	 * For same inode case we don't want our length pushed out past i_size

	 * as comparing that data range makes no sense.

	 *

	 * This effectively means we require aligned extents for the single

	 * inode case, whereas the other cases allow an unaligned length so long

	 * as it ends at i_size.

	 */

	if (dst == src && len != olen)

		return -EINVAL;

	/*

	 * Lock destination range to serialize with concurrent readpages() and

	 * source range to serialize with relocation.

	 */

	btrfs_double_extent_lock(src, loff, dst, dst_loff, len);

	ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);

	ret = btrfs_clone(src, dst, loff, len, len, dst_loff, 1);

	btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);

	return ret;