+external blockdev_setro : t -> string -> unit = "ocaml_guestfs_blockdev_setro"
+external blockdev_setrw : t -> string -> unit = "ocaml_guestfs_blockdev_setrw"
+external blockdev_getro : t -> string -> bool = "ocaml_guestfs_blockdev_getro"
+external blockdev_getss : t -> string -> int = "ocaml_guestfs_blockdev_getss"
+external blockdev_getbsz : t -> string -> int = "ocaml_guestfs_blockdev_getbsz"
+external blockdev_setbsz : t -> string -> int -> unit = "ocaml_guestfs_blockdev_setbsz"
+external blockdev_getsz : t -> string -> int64 = "ocaml_guestfs_blockdev_getsz"
+external blockdev_getsize64 : t -> string -> int64 = "ocaml_guestfs_blockdev_getsize64"
+external blockdev_flushbufs : t -> string -> unit = "ocaml_guestfs_blockdev_flushbufs"
+external blockdev_rereadpt : t -> string -> unit = "ocaml_guestfs_blockdev_rereadpt"
+external upload : t -> string -> string -> unit = "ocaml_guestfs_upload"
+external download : t -> string -> string -> unit = "ocaml_guestfs_download"
+external checksum : t -> string -> string -> string = "ocaml_guestfs_checksum"
+external tar_in : t -> string -> string -> unit = "ocaml_guestfs_tar_in"
+external tar_out : t -> string -> string -> unit = "ocaml_guestfs_tar_out"
+external tgz_in : t -> string -> string -> unit = "ocaml_guestfs_tgz_in"
+external tgz_out : t -> string -> string -> unit = "ocaml_guestfs_tgz_out"