Devicemapper: ignore Nodata errors when delete thin device

if thin device is deteled and the metadata exists, you can not
delete related containers. This patch ignore Nodata errors for
thin device deletion

Signed-off-by: Liu Hua <sdu.liu@huawei.com>

pkg/devicemapper/devmapper.go

@@ -67,12 +67,14 @@ var (
 	ErrBusy                 = errors.New("Device is Busy")
 	ErrDeviceIDExists       = errors.New("Device Id Exists")
 	ErrEnxio                = errors.New("No such device or address")
+	ErrEnoData              = errors.New("No data available")
 )
 
 var (
-	dmSawBusy  bool
-	dmSawExist bool
-	dmSawEnxio bool // No Such Device or Address
+	dmSawBusy    bool
+	dmSawExist   bool
+	dmSawEnxio   bool // No Such Device or Address
+	dmSawEnoData bool // No data available
 )
 
 type (
@@ -708,10 +710,15 @@ func DeleteDevice(poolName string, deviceID int) error {
 	}
 
 	dmSawBusy = false
+	dmSawEnoData = false
 	if err := task.run(); err != nil {
 		if dmSawBusy {
 			return ErrBusy
 		}
+		if dmSawEnoData {
+			logrus.Debugf("devicemapper: Device(id: %d) from pool(%s) does not exist", deviceID, poolName)
+			return nil
+		}
 		return fmt.Errorf("devicemapper: Error running DeleteDevice %s", err)
 	}
 	return nil

pkg/devicemapper/devmapper_log.go

@@ -55,6 +55,9 @@ func DevmapperLogCallback(level C.int, file *C.char, line, dmErrnoOrClass C.int,
 		if strings.Contains(msg, "No such device or address") {
 			dmSawEnxio = true
 		}
+		if strings.Contains(msg, "No data available") {
+			dmSawEnoData = true
+		}
 	}
 
 	if dmLogger != nil {