e2e: add testcase for volume expansion with rbd-nbd mounter

The rbd-nbd resize volume support with its netlink interface needs linux
kernel version >= v5.3.0

Hence define a defence check for the supported kernel version

Fixes: #2234

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

e2e/rbd.go

@@ -9,6 +9,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/ceph/ceph-csi/internal/util"
+
 	. "github.com/onsi/ginkgo" // nolint
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -429,6 +431,53 @@ var _ = Describe("RBD", func() {
 				}
 			})
 
+			By("Resize rbd-nbd PVC and check application directory size", func() {
+				kernelRelease, err := util.GetKernelVersion()
+				if err != nil {
+					e2elog.Failf("failed to get kernel version with error %v", err)
+				}
+				if util.CheckKernelSupport(kernelRelease, nbdResizeSupport) {
+					err := deleteResource(rbdExamplePath + "storageclass.yaml")
+					if err != nil {
+						e2elog.Failf("failed to delete storageclass with error %v", err)
+					}
+					// Storage class with rbd-nbd mounter
+					err = createRBDStorageClass(
+						f.ClientSet,
+						f,
+						defaultSCName,
+						nil,
+						map[string]string{"mounter": "rbd-nbd"},
+						deletePolicy)
+					if err != nil {
+						e2elog.Failf("failed to create storageclass with error %v", err)
+					}
+					// Block PVC resize
+					err = resizePVCAndValidateSize(rawPvcPath, rawAppPath, f)
+					if err != nil {
+						e2elog.Failf("failed to resize block PVC with error %v", err)
+					}
+					// validate created backend rbd images
+					validateRBDImageCount(f, 0, defaultRBDPool)
+
+					// FileSystem PVC resize
+					err = resizePVCAndValidateSize(pvcPath, appPath, f)
+					if err != nil {
+						e2elog.Failf("failed to resize filesystem PVC with error %v", err)
+					}
+					// validate created backend rbd images
+					validateRBDImageCount(f, 0, defaultRBDPool)
+					err = deleteResource(rbdExamplePath + "storageclass.yaml")
+					if err != nil {
+						e2elog.Failf("failed to delete storageclass with error %v", err)
+					}
+					err = createRBDStorageClass(f.ClientSet, f, defaultSCName, nil, nil, deletePolicy)
+					if err != nil {
+						e2elog.Failf("failed to create storageclass with error %v", err)
+					}
+				}
+			})
+
 			By("perform IO on rbd-nbd volume after nodeplugin restart", func() {
 				err := deleteResource(rbdExamplePath + "storageclass.yaml")
 				if err != nil {

e2e/rbd_helper.go

@@ -10,6 +10,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/ceph/ceph-csi/internal/util"
+
 	snapapi "github.com/kubernetes-csi/external-snapshotter/client/v4/apis/volumesnapshot/v1"
 	v1 "k8s.io/api/core/v1"
 	scv1 "k8s.io/api/storage/v1"
@@ -26,6 +28,18 @@ const (
 	thickProvisionMetaKey = "rbd.csi.ceph.com/thick-provisioned"
 )
 
+// nolint:gomnd // numbers specify Kernel versions.
+var nbdResizeSupport = []util.KernelVersion{
+	{
+		Version:      5,
+		PatchLevel:   3,
+		SubLevel:     0,
+		ExtraVersion: 0,
+		Distribution: "",
+		Backport:     false,
+	}, // standard 5.3+ versions
+}
+
 func imageSpec(pool, image string) string {
 	if radosNamespace != "" {
 		return pool + "/" + radosNamespace + "/" + image