btrfs_lookup_first_ordered_range
ordered = btrfs_lookup_first_ordered_range(inode, cur,
oe = btrfs_lookup_first_ordered_range(inode, start, len);
ordered = btrfs_lookup_first_ordered_range(inode, start, end + 1 - start);
ordered = btrfs_lookup_first_ordered_range(inode, cur,
struct btrfs_ordered_extent *btrfs_lookup_first_ordered_range(