+val du : t -> string -> int64
+(** estimate file space usage *)
+
+val initrd_list : t -> string -> string array
+(** list files in an initrd *)
+
+val mount_loop : t -> string -> string -> unit
+(** mount a file using the loop device *)
+
+val mkswap : t -> string -> unit
+(** create a swap partition *)
+
+val mkswap_L : t -> string -> string -> unit
+(** create a swap partition with a label *)
+
+val mkswap_U : t -> string -> string -> unit
+(** create a swap partition with an explicit UUID *)
+