+external lvremove : t -> string -> unit = "ocaml_guestfs_lvremove"
+external vgremove : t -> string -> unit = "ocaml_guestfs_vgremove"
+external pvremove : t -> string -> unit = "ocaml_guestfs_pvremove"
+external set_e2label : t -> string -> string -> unit = "ocaml_guestfs_set_e2label"
+external get_e2label : t -> string -> string = "ocaml_guestfs_get_e2label"
+external set_e2uuid : t -> string -> string -> unit = "ocaml_guestfs_set_e2uuid"
+external get_e2uuid : t -> string -> string = "ocaml_guestfs_get_e2uuid"
+external fsck : t -> string -> string -> int = "ocaml_guestfs_fsck"
+external zero : t -> string -> unit = "ocaml_guestfs_zero"