remove unused functions in volume/util

pkg/volume/util/util.go

@@ -22,12 +22,10 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
-	"runtime"
 	"strings"
 	"time"
 
 	v1 "k8s.io/api/core/v1"
-	storage "k8s.io/api/storage/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	apiruntime "k8s.io/apimachinery/pkg/runtime"
@@ -36,7 +34,6 @@ import (
 	"k8s.io/apimachinery/pkg/util/wait"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	clientset "k8s.io/client-go/kubernetes"
-	storagehelpers "k8s.io/component-helpers/storage/volume"
 	"k8s.io/klog/v2"
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
 	podutil "k8s.io/kubernetes/pkg/api/v1/pod"
@@ -46,7 +43,6 @@ import (
 	"k8s.io/kubernetes/pkg/volume/util/types"
 	"k8s.io/kubernetes/pkg/volume/util/volumepathhandler"
 	"k8s.io/mount-utils"
-	utilexec "k8s.io/utils/exec"
 	"k8s.io/utils/io"
 	utilstrings "k8s.io/utils/strings"
 )
@@ -111,22 +107,6 @@ func SetReady(dir string) {
 	file.Close()
 }
 
-// GetSecretForPod locates secret by name in the pod's namespace and returns secret map
-func GetSecretForPod(pod *v1.Pod, secretName string, kubeClient clientset.Interface) (map[string]string, error) {
-	secret := make(map[string]string)
-	if kubeClient == nil {
-		return secret, fmt.Errorf("cannot get kube client")
-	}
-	secrets, err := kubeClient.CoreV1().Secrets(pod.Namespace).Get(context.TODO(), secretName, metav1.GetOptions{})
-	if err != nil {
-		return secret, err
-	}
-	for name, data := range secrets.Data {
-		secret[name] = string(data)
-	}
-	return secret, nil
-}
-
 // GetSecretForPV locates secret by name and namespace, verifies the secret type, and returns secret map
 func GetSecretForPV(secretNamespace, secretName, volumePluginName string, kubeClient clientset.Interface) (map[string]string, error) {
 	secret := make(map[string]string)
@@ -146,23 +126,6 @@ func GetSecretForPV(secretNamespace, secretName, volumePluginName string, kubeCl
 	return secret, nil
 }
 
-// GetClassForVolume locates storage class by persistent volume
-func GetClassForVolume(kubeClient clientset.Interface, pv *v1.PersistentVolume) (*storage.StorageClass, error) {
-	if kubeClient == nil {
-		return nil, fmt.Errorf("cannot get kube client")
-	}
-	className := storagehelpers.GetPersistentVolumeClass(pv)
-	if className == "" {
-		return nil, fmt.Errorf("volume has no storage class")
-	}
-
-	class, err := kubeClient.StorageV1().StorageClasses().Get(context.TODO(), className, metav1.GetOptions{})
-	if err != nil {
-		return nil, err
-	}
-	return class, nil
-}
-
 // LoadPodFromFile will read, decode, and return a Pod from a file.
 func LoadPodFromFile(filePath string) (*v1.Pod, error) {
 	if filePath == "" {
@@ -538,13 +501,6 @@ func UnmapBlockVolume(
 	return nil
 }
 
-// GetPluginMountDir returns the global mount directory name appended
-// to the given plugin name's plugin directory
-func GetPluginMountDir(host volume.VolumeHost, name string) string {
-	mntDir := filepath.Join(host.GetPluginDir(name), MountsInGlobalPDPath)
-	return mntDir
-}
-
 // IsLocalEphemeralVolume determines whether the argument is a local ephemeral
 // volume vs. some other type
 // Local means the volume is using storage from the local disk that is managed by kubelet.
@@ -684,25 +640,6 @@ func HasMountRefs(mountPath string, mountRefs []string) bool {
 	return false
 }
 
-// WriteVolumeCache flush disk data given the specified mount path
-func WriteVolumeCache(deviceMountPath string, exec utilexec.Interface) error {
-	// If runtime os is windows, execute Write-VolumeCache powershell command on the disk
-	if runtime.GOOS == "windows" {
-		cmdString := "Get-Volume -FilePath $env:mountpath | Write-Volumecache"
-		cmd := exec.Command("powershell", "/c", cmdString)
-		env := append(os.Environ(), fmt.Sprintf("mountpath=%s", deviceMountPath))
-		cmd.SetEnv(env)
-		klog.V(8).Infof("Executing command: %q", cmdString)
-		output, err := cmd.CombinedOutput()
-		klog.Infof("command (%q) execeuted: %v, output: %q", cmdString, err, string(output))
-		if err != nil {
-			return fmt.Errorf("command (%q) failed: %v, output: %q", cmdString, err, string(output))
-		}
-	}
-	// For linux runtime, it skips because unmount will automatically flush disk data
-	return nil
-}
-
 // IsMultiAttachAllowed checks if attaching this volume to multiple nodes is definitely not allowed/possible.
 // In its current form, this function can only reliably say for which volumes it's definitely forbidden. If it returns
 // false, it is not guaranteed that multi-attach is actually supported by the volume type and we must rely on the