Kubelet:

Centralize Capacity discovery of standard resources in Container manager.
Have storage derive node capacity from container manager.
Move certain cAdvisor interfaces to the cAdvisor package in the process.

This patch fixes a bug in container manager where it was writing to a map without synchronization.

Signed-off-by: Vishnu kannan <vishnuk@google.com>

pkg/kubelet/cm/container_manager_linux.go

@@ -224,6 +224,25 @@ func NewContainerManager(mountUtil mount.Interface, cadvisorInterface cadvisor.I
 	} else {
 		return nil, err
 	}
+	rootfs, err := cadvisorInterface.RootFsInfo()
+	if err != nil {
+		capacity[v1.ResourceStorageScratch] = resource.MustParse("0Gi")
+	} else {
+		for rName, rCap := range cadvisor.StorageScratchCapacityFromFsInfo(rootfs) {
+			capacity[rName] = rCap
+		}
+	}
+
+	if hasDedicatedImageFs, _ := cadvisorInterface.HasDedicatedImageFs(); hasDedicatedImageFs {
+		imagesfs, err := cadvisorInterface.ImagesFsInfo()
+		if err != nil {
+			glog.Errorf("Failed to get Image filesystem information: %v", err)
+		} else {
+			for rName, rCap := range cadvisor.StorageOverlayCapacityFromFsInfo(imagesfs) {
+				capacity[rName] = rCap
+			}
+		}
+	}
 
 	cgroupRoot := nodeConfig.CgroupRoot
 	cgroupManager := NewCgroupManager(subsystems, nodeConfig.CgroupDriver)