external stat : t -> string -> stat = "ocaml_guestfs_stat"
external lstat : t -> string -> stat = "ocaml_guestfs_lstat"
external statvfs : t -> string -> statvfs = "ocaml_guestfs_statvfs"
+external tune2fs_l : t -> string -> (string * string) list = "ocaml_guestfs_tune2fs_l"