Return Capacity in Create Volume Request

After PR [1], volume capacity needs to be returned by csi plugin
This commit returns volume capacity in create volume request

[1]kubernetes-csi/external-provisioner#76

pkg/csi/cinder/controllerserver.go

@@ -68,6 +68,7 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 
 	resID := ""
 	resAvailability := ""
+	resSize := 0
 
 	if len(volumes) == 1 {
 		resID = volumes[0].ID
@@ -77,19 +78,20 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 		return nil, errors.New("multiple volumes reported by Cinder with same name")
 	} else {
 		// Volume Create
-		resID, resAvailability, err = cloud.CreateVolume(volName, volSizeGB, volType, volAvailability, nil)
+		resID, resAvailability, resSize, err = cloud.CreateVolume(volName, volSizeGB, volType, volAvailability, nil)
 		if err != nil {
 			glog.V(3).Infof("Failed to CreateVolume: %v", err)
 			return nil, err
 		}
 
-		glog.V(4).Infof("Create volume %s in Availability Zone: %s", resID, resAvailability)
+		glog.V(4).Infof("Create volume %s in Availability Zone: %s of size %s GiB", resID, resAvailability, resSize)
 
 	}
 
 	return &csi.CreateVolumeResponse{
 		Volume: &csi.Volume{
-			Id: resID,
+			Id:            resID,
+			CapacityBytes: int64(resSize * 1024 * 1024 * 1024),
 			Attributes: map[string]string{
 				"availability": resAvailability,
 			},

pkg/csi/cinder/openstack/openstack.go

@@ -27,7 +27,7 @@ import (
 )
 
 type IOpenStack interface {
-	CreateVolume(name string, size int, vtype, availability string, tags *map[string]string) (string, string, error)
+	CreateVolume(name string, size int, vtype, availability string, tags *map[string]string) (string, string, int, error)
 	DeleteVolume(volumeID string) error
 	AttachVolume(instanceID, volumeID string) (string, error)
 	WaitDiskAttached(instanceID string, volumeID string) error

pkg/csi/cinder/openstack/openstack_volumes.go

@@ -61,7 +61,7 @@ type Volume struct {
 }
 
 // CreateVolume creates a volume of given size
-func (os *OpenStack) CreateVolume(name string, size int, vtype, availability string, tags *map[string]string) (string, string, error) {
+func (os *OpenStack) CreateVolume(name string, size int, vtype, availability string, tags *map[string]string) (string, string, int, error) {
 	opts := &volumes.CreateOpts{
 		Name:             name,
 		Size:             size,
@@ -74,10 +74,10 @@ func (os *OpenStack) CreateVolume(name string, size int, vtype, availability str
 
 	vol, err := volumes.Create(os.blockstorage, opts).Extract()
 	if err != nil {
-		return "", "", err
+		return "", "", 0, err
 	}
 
-	return vol.ID, vol.AvailabilityZone, nil
+	return vol.ID, vol.AvailabilityZone, vol.Size, nil
 }
 
 // GetVolumesByName is a wrapper around ListVolumes that creates a Name filter to act as a GetByName