btrfs_get_subvol_name_from_objectid
subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
subvol_name = btrfs_get_subvol_name_from_objectid(info,
subvol_name = btrfs_get_subvol_name_from_objectid(
char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,