external du : t -> string -> int64 = "ocaml_guestfs_du"
external initrd_list : t -> string -> string array = "ocaml_guestfs_initrd_list"
external mount_loop : t -> string -> string -> unit = "ocaml_guestfs_mount_loop"
+external mkswap : t -> string -> unit = "ocaml_guestfs_mkswap"
+external mkswap_L : t -> string -> string -> unit = "ocaml_guestfs_mkswap_L"
+external mkswap_U : t -> string -> string -> unit = "ocaml_guestfs_mkswap_U"