type cancelTest struct {
	mode     testMode
	newReq   func(req *Request) *Request       // prepare the request to cancel
	cancel   func(tr *Transport, req *Request) // cancel the request
	checkErr func(when string, err error)      // verify the expected error
}

// runCancelTestTransport uses Transport.CancelRequest.
func runCancelTestTransport(t *testing.T, mode testMode, f func(t *testing.T, test cancelTest)) {

		dirPath, volName := vol.BlockVolumeMapper.GetPodDeviceMapPath()
		symlinkPath := filepath.Join(dirPath, volName)
		if islinkExist, checkErr := blkutil.IsSymlinkExist(symlinkPath); checkErr != nil {
			return nil, checkErr
		} else if islinkExist {
			// Check readOnly in PVCVolumeSource and set read only permission if it's true.
			permission := "mrw"
			if vol.ReadOnly {
				permission = "r"