Adding 'HasDiskIo' to Container Spec to indicate if diskio stats are available for a given container.

container/docker/handler.go

@@ -229,6 +229,8 @@ func libcontainerConfigToContainerSpec(config *libcontainer.Config, mi *info.Mac
 	}
 
 	spec.HasNetwork = true
+	spec.HasDiskIo = true
+
 	return spec
 }
 

container/raw/handler.go

@@ -225,6 +225,11 @@ func (self *rawContainerHandler) GetSpec() (info.ContainerSpec, error) {
 	//Network
 	spec.HasNetwork = self.hasNetwork
 
+	// DiskIo.
+	if blkioRoot, ok := self.cgroupPaths["blkio"]; ok && utils.FileExists(blkioRoot) {
+		spec.HasDiskIo = true
+	}
+
 	// Check physical network devices for root container.
 	nd, err := self.GetRootNetworkDevices()
 	if err != nil {

info/container.go

@@ -49,6 +49,9 @@ type ContainerSpec struct {
 	HasNetwork bool `json:"has_network"`
 
 	HasFilesystem bool `json:"has_filesystem"`
+
+	// HasDiskIo when true, indicates that DiskIo stats will be available.
+	HasDiskIo bool `json:"has_diskio"`
 }
 
 // Container reference contains enough information to uniquely identify a container

integration/tests/api/docker_test.go

@@ -199,6 +199,7 @@ func TestDockerContainerSpec(t *testing.T) {
 	assert.Equal(containerInfo.Spec.Memory.Limit, memoryLimit, "Container should have memory limit of %d, has %d", memoryLimit, containerInfo.Spec.Memory.Limit)
 	assert.True(containerInfo.Spec.HasNetwork, "Network should be isolated")
 	assert.True(containerInfo.Spec.HasFilesystem, "Filesystem should be isolated")
+	assert.True(containerInfo.Spec.HasDiskIo, "Blkio should be isolated")
 }
 
 // Check the CPU ContainerStats.