pub fn create_fs_device(
protection_type: ProtectionType,
jail_config: Option<&JailConfig>,
ugid: (Option<u32>, Option<u32>),
uid_map: &str,
gid_map: &str,
src: &Path,
tag: &str,
fs_cfg: Config,
device_tube: Tube,
) -> Result<VirtioDeviceStub>