Merge pull request kubernetes#94881 from nixpanic/test/e2e/storage/dd-without-cache

e2e: skip write/read cache when running Block-mode RWX PVC tests

Author: k8s-ci-robot

test/e2e/framework/pod/create.go

@@ -48,6 +48,7 @@ type Config struct {
 	SeLinuxLabel        *v1.SELinuxOptions
 	FsGroup             *int64
 	NodeSelection       NodeSelection
+	ImageID             int
 }
 
 // CreateUnschedulablePod with given claims based on node selector
@@ -185,6 +186,10 @@ func MakeSecPod(podConfig *Config) (*v1.Pod, error) {
 			return &i
 		}(1000)
 	}
+	image := imageutils.BusyBox
+	if podConfig.ImageID != imageutils.None {
+		image = podConfig.ImageID
+	}
 	podSpec := &v1.Pod{
 		TypeMeta: metav1.TypeMeta{
 			Kind:       "Pod",
@@ -203,7 +208,7 @@ func MakeSecPod(podConfig *Config) (*v1.Pod, error) {
 			Containers: []v1.Container{
 				{
 					Name:    "write-pod",
-					Image:   imageutils.GetE2EImage(imageutils.BusyBox),
+					Image:   imageutils.GetE2EImage(image),
 					Command: []string{"/bin/sh"},
 					Args:    []string{"-c", podConfig.Command},
 					SecurityContext: &v1.SecurityContext{

test/e2e/storage/testsuites/multivolume.go

@@ -35,6 +35,7 @@ import (
 	e2evolume "k8s.io/kubernetes/test/e2e/framework/volume"
 	"k8s.io/kubernetes/test/e2e/storage/testpatterns"
 	"k8s.io/kubernetes/test/e2e/storage/utils"
+	imageutils "k8s.io/kubernetes/test/utils/image"
 )
 
 type multiVolumeTestSuite struct {
@@ -423,14 +424,14 @@ func testAccessMultipleVolumes(f *framework.Framework, cs clientset.Interface, n
 
 		if readSeedBase > 0 {
 			ginkgo.By(fmt.Sprintf("Checking if read from the volume%d works properly", index))
-			utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, readSeedBase+int64(i))
+			utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, false, path, byteLen, readSeedBase+int64(i))
 		}
 
 		ginkgo.By(fmt.Sprintf("Checking if write to the volume%d works properly", index))
-		utils.CheckWriteToPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, writeSeedBase+int64(i))
+		utils.CheckWriteToPath(f, pod, *pvc.Spec.VolumeMode, false, path, byteLen, writeSeedBase+int64(i))
 
 		ginkgo.By(fmt.Sprintf("Checking if read from the volume%d works properly", index))
-		utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, writeSeedBase+int64(i))
+		utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, false, path, byteLen, writeSeedBase+int64(i))
 	}
 
 	pod, err = cs.CoreV1().Pods(pod.Namespace).Get(context.TODO(), pod.Name, metav1.GetOptions{})
@@ -481,6 +482,7 @@ func TestConcurrentAccessToSingleVolume(f *framework.Framework, cs clientset.Int
 		ginkgo.By(fmt.Sprintf("Creating pod%d with a volume on %+v", index, node))
 		podConfig := e2epod.Config{
 			NS:            ns,
+			ImageID:       imageutils.DebianIptables,
 			PVCs:          []*v1.PersistentVolumeClaim{pvc},
 			SeLinuxLabel:  e2epv.SELinuxLabel,
 			NodeSelection: node,
@@ -506,6 +508,14 @@ func TestConcurrentAccessToSingleVolume(f *framework.Framework, cs clientset.Int
 
 	var seed int64
 	byteLen := 64
+	directIO := false
+	// direct IO is needed for Block-mode PVs
+	if *pvc.Spec.VolumeMode == v1.PersistentVolumeBlock {
+		// byteLen should be the size of a sector to enable direct I/O
+		byteLen = 512
+		directIO = true
+	}
+
 	path := "/mnt/volume1"
 	// Check if volume can be accessed from each pod
 	for i, pod := range pods {
@@ -521,17 +531,17 @@ func TestConcurrentAccessToSingleVolume(f *framework.Framework, cs clientset.Int
 		if i != 0 {
 			ginkgo.By(fmt.Sprintf("From pod%d, checking if reading the data that pod%d write works properly", index, index-1))
 			// For 1st pod, no one has written data yet, so pass the read check
-			utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, seed)
+			utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, directIO, path, byteLen, seed)
 		}
 
 		// Update the seed and check if write/read works properly
 		seed = time.Now().UTC().UnixNano()
 
 		ginkgo.By(fmt.Sprintf("Checking if write to the volume in pod%d works properly", index))
-		utils.CheckWriteToPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, seed)
+		utils.CheckWriteToPath(f, pod, *pvc.Spec.VolumeMode, directIO, path, byteLen, seed)
 
 		ginkgo.By(fmt.Sprintf("Checking if read from the volume in pod%d works properly", index))
-		utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, seed)
+		utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, directIO, path, byteLen, seed)
 	}
 
 	// Delete the last pod and remove from slice of pods
@@ -560,16 +570,16 @@ func TestConcurrentAccessToSingleVolume(f *framework.Framework, cs clientset.Int
 		} else {
 			ginkgo.By(fmt.Sprintf("From pod%d, rechecking if reading the data that pod%d write works properly", index, index-1))
 		}
-		utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, seed)
+		utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, directIO, path, byteLen, seed)
 
 		// Update the seed and check if write/read works properly
 		seed = time.Now().UTC().UnixNano()
 
 		ginkgo.By(fmt.Sprintf("Rechecking if write to the volume in pod%d works properly", index))
-		utils.CheckWriteToPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, seed)
+		utils.CheckWriteToPath(f, pod, *pvc.Spec.VolumeMode, directIO, path, byteLen, seed)
 
 		ginkgo.By(fmt.Sprintf("Rechecking if read from the volume in pod%d works properly", index))
-		utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, path, byteLen, seed)
+		utils.CheckReadFromPath(f, pod, *pvc.Spec.VolumeMode, directIO, path, byteLen, seed)
 	}
 }
 

test/e2e/storage/utils/utils.go

@@ -241,13 +241,13 @@ func TestKubeletRestartsAndRestoresMount(c clientset.Interface, f *framework.Fra
 	seed := time.Now().UTC().UnixNano()
 
 	ginkgo.By("Writing to the volume.")
-	CheckWriteToPath(f, clientPod, v1.PersistentVolumeFilesystem, path, byteLen, seed)
+	CheckWriteToPath(f, clientPod, v1.PersistentVolumeFilesystem, false, path, byteLen, seed)
 
 	ginkgo.By("Restarting kubelet")
 	KubeletCommand(KRestart, c, clientPod)
 
 	ginkgo.By("Testing that written file is accessible.")
-	CheckReadFromPath(f, clientPod, v1.PersistentVolumeFilesystem, path, byteLen, seed)
+	CheckReadFromPath(f, clientPod, v1.PersistentVolumeFilesystem, false, path, byteLen, seed)
 
 	framework.Logf("Volume mount detected on pod %s and written file %s is readable post-restart.", clientPod.Name, path)
 }
@@ -259,13 +259,13 @@ func TestKubeletRestartsAndRestoresMap(c clientset.Interface, f *framework.Frame
 	seed := time.Now().UTC().UnixNano()
 
 	ginkgo.By("Writing to the volume.")
-	CheckWriteToPath(f, clientPod, v1.PersistentVolumeBlock, path, byteLen, seed)
+	CheckWriteToPath(f, clientPod, v1.PersistentVolumeBlock, false, path, byteLen, seed)
 
 	ginkgo.By("Restarting kubelet")
 	KubeletCommand(KRestart, c, clientPod)
 
 	ginkgo.By("Testing that written pv is accessible.")
-	CheckReadFromPath(f, clientPod, v1.PersistentVolumeBlock, path, byteLen, seed)
+	CheckReadFromPath(f, clientPod, v1.PersistentVolumeBlock, false, path, byteLen, seed)
 
 	framework.Logf("Volume map detected on pod %s and written data %s is readable post-restart.", clientPod.Name, path)
 }
@@ -656,33 +656,54 @@ func genBinDataFromSeed(len int, seed int64) []byte {
 }
 
 // CheckReadFromPath validate that file can be properly read.
-func CheckReadFromPath(f *framework.Framework, pod *v1.Pod, volMode v1.PersistentVolumeMode, path string, len int, seed int64) {
+//
+// Note: directIO does not work with (default) BusyBox Pods. A requirement for
+// directIO to function correctly, is to read whole sector(s) for Block-mode
+// PVCs (normally a sector is 512 bytes), or memory pages for files (commonly
+// 4096 bytes).
+func CheckReadFromPath(f *framework.Framework, pod *v1.Pod, volMode v1.PersistentVolumeMode, directIO bool, path string, len int, seed int64) {
 	var pathForVolMode string
+	var iflag string
+
 	if volMode == v1.PersistentVolumeBlock {
 		pathForVolMode = path
 	} else {
 		pathForVolMode = filepath.Join(path, "file1.txt")
 	}
 
+	if directIO {
+		iflag = "iflag=direct"
+	}
+
 	sum := sha256.Sum256(genBinDataFromSeed(len, seed))
 
-	VerifyExecInPodSucceed(f, pod, fmt.Sprintf("dd if=%s bs=%d count=1 | sha256sum", pathForVolMode, len))
-	VerifyExecInPodSucceed(f, pod, fmt.Sprintf("dd if=%s bs=%d count=1 | sha256sum | grep -Fq %x", pathForVolMode, len, sum))
+	VerifyExecInPodSucceed(f, pod, fmt.Sprintf("dd if=%s %s bs=%d count=1 | sha256sum", pathForVolMode, iflag, len))
+	VerifyExecInPodSucceed(f, pod, fmt.Sprintf("dd if=%s %s bs=%d count=1 | sha256sum | grep -Fq %x", pathForVolMode, iflag, len, sum))
 }
 
 // CheckWriteToPath that file can be properly written.
-func CheckWriteToPath(f *framework.Framework, pod *v1.Pod, volMode v1.PersistentVolumeMode, path string, len int, seed int64) {
+//
+// Note: nocache does not work with (default) BusyBox Pods. To read without
+// caching, enable directIO with CheckReadFromPath and check the hints about
+// the len requirements.
+func CheckWriteToPath(f *framework.Framework, pod *v1.Pod, volMode v1.PersistentVolumeMode, nocache bool, path string, len int, seed int64) {
 	var pathForVolMode string
+	var oflag string
+
 	if volMode == v1.PersistentVolumeBlock {
 		pathForVolMode = path
 	} else {
 		pathForVolMode = filepath.Join(path, "file1.txt")
 	}
 
+	if nocache {
+		oflag = "oflag=nocache"
+	}
+
 	encoded := base64.StdEncoding.EncodeToString(genBinDataFromSeed(len, seed))
 
 	VerifyExecInPodSucceed(f, pod, fmt.Sprintf("echo %s | base64 -d | sha256sum", encoded))
-	VerifyExecInPodSucceed(f, pod, fmt.Sprintf("echo %s | base64 -d | dd of=%s bs=%d count=1", encoded, pathForVolMode, len))
+	VerifyExecInPodSucceed(f, pod, fmt.Sprintf("echo %s | base64 -d | dd of=%s %s bs=%d count=1", encoded, pathForVolMode, oflag, len))
 }
 
 // findMountPoints returns all mount points on given node under specified directory.

test/utils/image/manifest.go

@@ -119,8 +119,10 @@ var (
 )
 
 const (
+	// None is to be used for unset/default images
+	None = iota
 	// Agnhost image
-	Agnhost = iota
+	Agnhost
 	// AgnhostPrivate image
 	AgnhostPrivate
 	// APIServer image