btrfs_get_extent_owner_root
owner = btrfs_get_extent_owner_root(fs_info, leaf, path->slots[0]);
delta.root = btrfs_get_extent_owner_root(trans->fs_info,
u64 btrfs_get_extent_owner_root(struct btrfs_fs_info *fs_info,
u64 owning_root_id = btrfs_get_extent_owner_root(fs_info,