kubernetes/pkg/volume/util/operationexecutor/node_expander.go

type NodeExpander …

func newNodeExpander(resizeOp nodeResizeOperationOpts, client clientset.Interface, recorder record.EventRecorder) *NodeExpander { … }

type testResponseData …

// runPreCheck performs some sanity checks before expansion can be performed on the PVC.
// This function returns true only if node expansion is allowed to proceed otherwise
// it returns false.
func (ne *NodeExpander) runPreCheck() bool { … }

func (ne *NodeExpander) expandOnPlugin() (bool, resource.Quantity, error) { … }