external df_h : t -> string = "ocaml_guestfs_df_h"
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"