external head_n : t -> int -> string -> string array = "ocaml_guestfs_head_n"
external tail : t -> string -> string array = "ocaml_guestfs_tail"
external tail_n : t -> int -> string -> string array = "ocaml_guestfs_tail_n"
+external df : t -> string = "ocaml_guestfs_df"
+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"