Merge pull request xapi-project#88 from xen-org/cooper2

Merge the cooper2 changes

tapctl/tapctl.ml

@@ -3,6 +3,48 @@ open Listext
 open Threadext
 open Forkhelpers
 
+(* Tapdisk stats *)
+module Stats = struct
+	module Tap = struct 
+		type t = {
+			minor: int;
+			reqs: (int64 * int64);
+			kicks: (int64 * int64);
+		} with rpc
+	end
+
+	module Driver = struct 
+		type t = {
+			ty : int;
+			name : string;
+		} with rpc
+
+		let rpc_of_t x = match (rpc_of_t x) with | Rpc.Dict x -> Rpc.Dict (List.map (function ("ty",y) -> ("type",y) | x -> x) x) | y -> y
+		let t_of_rpc rpc = t_of_rpc (match rpc with | Rpc.Dict x -> Rpc.Dict (List.map (function ("type",y) -> ("ty",y) | x -> x) x ) | y -> y) 
+
+	end
+
+	module Image = struct
+		type t = {
+			name : string;
+			hits : int64 * int64;
+			fail : int64 * int64;
+			driver : Driver.t
+		} with rpc
+	end
+
+	type t = {
+		name : string;
+		secs : (int64 * int64);
+		images : Image.t list;
+		tap : Tap.t;
+		nbd_mirror_failed : int;
+	} with rpc
+end
+
+
+
+
 type tapdev = {
 	minor : int;
 	tapdisk_pid : int;
@@ -228,6 +270,16 @@ module Dummy = struct
 						else 
 							None
 					| _ -> None) list)
+
+	let stats ctx t =
+		let open Stats in 
+		{ name = "none";
+		  secs = 0L,0L;
+		  images = [];
+		  tap = { Tap.minor = t.minor;
+		          reqs = 0L,0L;
+				  kicks = 0L,0L; };
+		  nbd_mirror_failed = 0; }
 end
 
 
@@ -338,6 +390,11 @@ let is_active ctx t =
 		| [(tapdev,state,Some _ )] -> true
 		| _ -> false
 
+let stats ctx t =
+	if ctx.dummy then Dummy.stats ctx t else begin
+		Stats.t_of_rpc (Jsonrpc.of_string (invoke_tap_ctl ctx "stats" (args t)))
+	end
+
 (* We need to be able to check that a given device's major number corresponds to the right driver *)
 let read_proc_devices () : (int * string) list = 
 	let parse_line x = match List.filter (fun x -> x <> "") (String.split ' ' x) with

tapctl/tapctl.mli

@@ -1,5 +1,38 @@
 (** Represents an active tapdisk instance *)
 type tapdev
+
+module Stats :
+  sig
+    module Tap :
+      sig
+        type t = {
+          minor : int;
+          reqs : int64 * int64;
+          kicks : int64 * int64;
+        }
+      end
+    module Driver :
+      sig
+        type t = { ty : int; name : string; }
+      end
+    module Image :
+      sig
+        type t = {
+          name : string;
+          hits : int64 * int64;
+          fail : int64 * int64;
+          driver : Driver.t;
+        }
+      end
+    type t = {
+      name : string;
+      secs : int64 * int64;
+      images : Image.t list;
+      tap : Tap.t;
+      nbd_mirror_failed : int;
+    }
+  end
+
 val tapdev_of_rpc : Rpc.t -> tapdev
 val rpc_of_tapdev : tapdev -> Rpc.t
 
@@ -32,6 +65,7 @@ val free : context -> int -> unit
 val list : ?t:tapdev -> context -> t list
 val is_paused : context -> tapdev -> bool
 val is_active : context -> tapdev -> bool
+val stats : context -> tapdev -> Stats.t
 
 (** Thrown by [of_device x] when [x] is a device not owned by blktap *)
 exception Not_blktap