Add disk suppport label to NodeGetInfo topologies.

Author: julianKatz

cmd/gce-pd-csi-driver/main.go

@@ -99,6 +99,8 @@ var (
 
 	diskTopology = flag.Bool("disk-topology", false, "If set to true, the driver will add a disk-type.gke.io/[disk-type] topology label when the StorageClass has the use-allowed-disk-topology parameter set to true. That topology label is included in the Topologies returned in CreateVolumeResponse. This flag is disabled by default.")
 
+	dynamicVolumes = flag.Bool("dynamic-volumes", false, "If set to true, the CSI driver will automatically select a compatible disk type based on the presence of the dynamic-volume parameter and disk types defined in the StorageClass. Disabled by default.")
+
 	diskCacheSyncPeriod = flag.Duration("disk-cache-sync-period", 10*time.Minute, "Period for the disk cache to check the /dev/disk/by-id/ directory and evaluate the symlinks")
 
 	enableDiskSizeValidation = flag.Bool("enable-disk-size-validation", false, "If set to true, the driver will validate that the requested disk size is matches the physical disk size. This flag is disabled by default.")
@@ -257,6 +259,7 @@ func handle() {
 		args := &driver.GCEControllerServerArgs{
 			EnableDiskTopology:       *diskTopology,
 			EnableDiskSizeValidation: *enableDiskSizeValidation,
+			EnableDynamicVolumes:     *dynamicVolumes,
 		}
 
 		controllerServer = driver.NewControllerServer(gceDriver, cloudProvider, initialBackoffDuration, maxBackoffDuration, fallbackRequisiteZones, *enableStoragePoolsFlag, *enableDataCacheFlag, multiZoneVolumeHandleConfig, listVolumesConfig, provisionableDisksConfig, *enableHdHAFlag, args)
@@ -299,6 +302,7 @@ func handle() {
 			SysfsPath:                "/sys",
 			MetricsManager:           metricsManager,
 			DeviceCache:              deviceCache,
+			EnableDynamicVolumes:     *dynamicVolumes,
 		}
 		nodeServer = driver.NewNodeServer(gceDriver, mounter, deviceUtils, meta, statter, nsArgs)
 

pkg/common/utils.go

@@ -492,6 +492,11 @@ func MapNumber(vCPUs int64, limitMap []constants.MachineHyperdiskLimit) int64 {
 	return 15
 }
 
+// HasDiskTypeLabelKeyPrefix checks if the label key starts with the DiskTypeKeyPrefix.
+func HasDiskTypeLabelKeyPrefix(labelKey string) bool {
+	return strings.HasPrefix(labelKey, constants.DiskTypeKeyPrefix)
+}
+
 func DiskTypeLabelKey(diskType string) string {
 	return fmt.Sprintf("%s/%s", constants.DiskTypeKeyPrefix, diskType)
 }

pkg/gce-pd-csi-driver/controller.go

@@ -132,6 +132,7 @@ type GCEControllerServer struct {
 type GCEControllerServerArgs struct {
 	EnableDiskTopology       bool
 	EnableDiskSizeValidation bool
+	EnableDynamicVolumes     bool
 }
 
 type MultiZoneVolumeHandleConfig struct {

pkg/gce-pd-csi-driver/gce-pd-driver.go

@@ -160,6 +160,7 @@ func NewNodeServer(gceDriver *GCEDriver, mounter *mount.SafeFormatAndMount, devi
 		SysfsPath:                args.SysfsPath,
 		metricsManager:           args.MetricsManager,
 		DeviceCache:              args.DeviceCache,
+		EnableDynamicVolumes:     args.EnableDynamicVolumes,
 	}
 }
 

pkg/gce-pd-csi-driver/node.go

@@ -32,9 +32,9 @@ import (
 
 	csi "github.com/container-storage-interface/spec/lib/go/csi"
 
+	corev1 "k8s.io/api/core/v1"
 	"k8s.io/klog/v2"
 	"k8s.io/mount-utils"
-
 	"sigs.k8s.io/gcp-compute-persistent-disk-csi-driver/pkg/common"
 	"sigs.k8s.io/gcp-compute-persistent-disk-csi-driver/pkg/constants"
 	"sigs.k8s.io/gcp-compute-persistent-disk-csi-driver/pkg/deviceutils"
@@ -83,6 +83,8 @@ type GCENodeServer struct {
 	metricsManager *metrics.MetricsManager
 	// A cache of the device paths for the volumes that are attached to the node.
 	DeviceCache *linkcache.DeviceCache
+
+	EnableDynamicVolumes bool
 }
 
 type NodeServerArgs struct {
@@ -101,6 +103,8 @@ type NodeServerArgs struct {
 
 	MetricsManager *metrics.MetricsManager
 	DeviceCache    *linkcache.DeviceCache
+
+	EnableDynamicVolumes bool
 }
 
 var _ csi.NodeServer = &GCENodeServer{}
@@ -717,9 +721,26 @@ func (ns *GCENodeServer) NodeGetInfo(ctx context.Context, req *csi.NodeGetInfoRe
 		Segments: map[string]string{constants.TopologyKeyZone: ns.MetadataService.GetZone()},
 	}
 
+	node, err := k8sclient.GetNodeWithRetry(ctx, ns.MetadataService.GetName())
+	if err != nil {
+		klog.Errorf("Failed to get node %s: %v. The error is ignored so that the driver can register", ns.MetadataService.GetName(), err.Error())
+		err = nil
+	}
+
+	if ns.EnableDynamicVolumes {
+		labels, err := ns.getDiskTypeLabels(node)
+		if err != nil {
+			return nil, fmt.Errorf("failed to fetch GKE topology labels: %v", err)
+		}
+
+		for k, v := range labels {
+			top.Segments[k] = v
+		}
+	}
+
 	nodeID := common.CreateNodeID(ns.MetadataService.GetProject(), ns.MetadataService.GetZone(), ns.MetadataService.GetName())
 
-	volumeLimits, err := ns.GetVolumeLimits(ctx)
+	volumeLimits, err := ns.getVolumeLimits(ctx, node)
 	if err != nil {
 		klog.Errorf("GetVolumeLimits failed: %v. The error is ignored so that the driver can register", err.Error())
 		// No error should be returned from NodeGetInfo, otherwise the driver will not register
@@ -881,7 +902,7 @@ func (ns *GCENodeServer) NodeExpandVolume(ctx context.Context, req *csi.NodeExpa
 	}, nil
 }
 
-func (ns *GCENodeServer) GetVolumeLimits(ctx context.Context) (int64, error) {
+func (ns *GCENodeServer) getVolumeLimits(ctx context.Context, node *corev1.Node) (int64, error) {
 	// Machine-type format: n1-type-CPUS or custom-CPUS-RAM or f1/g1-type
 	machineType := ns.MetadataService.GetMachineType()
 
@@ -893,7 +914,7 @@ func (ns *GCENodeServer) GetVolumeLimits(ctx context.Context) (int64, error) {
 	}
 
 	// Get attach limit override from label
-	attachLimitOverride, err := GetAttachLimitsOverrideFromNodeLabel(ctx, ns.MetadataService.GetName())
+	attachLimitOverride, err := getAttachLimitsOverrideFromNodeLabel(node)
 	if err == nil && attachLimitOverride > 0 && attachLimitOverride < 128 {
 		return attachLimitOverride, nil
 	} else {
@@ -955,11 +976,12 @@ func (ns *GCENodeServer) GetVolumeLimits(ctx context.Context) (int64, error) {
 	return volumeLimitBig, nil
 }
 
-func GetAttachLimitsOverrideFromNodeLabel(ctx context.Context, nodeName string) (int64, error) {
-	node, err := k8sclient.GetNodeWithRetry(ctx, nodeName)
-	if err != nil {
-		return 0, err
+func getAttachLimitsOverrideFromNodeLabel(node *corev1.Node) (int64, error) {
+	// If then node is nil, return 0 which means there is no override
+	if node == nil {
+		return 0, fmt.Errorf("node is nil")
 	}
+
 	if val, found := node.GetLabels()[fmt.Sprintf(constants.NodeRestrictionLabelPrefix, constants.AttachLimitOverrideLabel)]; found {
 		attachLimitOverrideForNode, err := strconv.ParseInt(val, 10, 64)
 		if err != nil {
@@ -970,3 +992,17 @@ func GetAttachLimitsOverrideFromNodeLabel(ctx context.Context, nodeName string)
 	}
 	return 0, nil
 }
+
+func (ns *GCENodeServer) getDiskTypeLabels(node *corev1.Node) (map[string]string, error) {
+	if node == nil {
+		return nil, fmt.Errorf("node is nil")
+	}
+	lbls := make(map[string]string)
+	for k, v := range node.GetLabels() {
+		if common.HasDiskTypeLabelKeyPrefix(k) {
+			lbls[k] = v
+		}
+	}
+
+	return lbls, nil
+}

pkg/gce-pd-csi-driver/node_test.go

@@ -21,6 +21,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"sort"
 	"strings"
 	"testing"
 	"time"
@@ -32,6 +33,9 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/testing/protocmp"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/mount-utils"
 	"sigs.k8s.io/gcp-compute-persistent-disk-csi-driver/pkg/constants"
 	"sigs.k8s.io/gcp-compute-persistent-disk-csi-driver/pkg/deviceutils"
@@ -237,11 +241,11 @@ func TestNodeGetVolumeStats(t *testing.T) {
 func TestNodeGetVolumeLimits(t *testing.T) {
 	gceDriver := getTestGCEDriver(t)
 	ns := gceDriver.ns
-	req := &csi.NodeGetInfoRequest{}
 
 	testCases := []struct {
 		name           string
 		machineType    string
+		node           *corev1.Node
 		expVolumeLimit int64
 		expectError    bool
 	}{
@@ -431,25 +435,35 @@ func TestNodeGetVolumeLimits(t *testing.T) {
 			name:           "a4x-medgpu-nolssd", // does not exist, testing edge case
 			machineType:    "a4x-medgpu-nolssd",
 			expVolumeLimit: volumeLimitBig,
+			expectError:    true,
+		},
+		{
+			name:        "Node Override",
+			machineType: "n1-standard-1",
+			node: &corev1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: map[string]string{
+						fmt.Sprintf(constants.NodeRestrictionLabelPrefix, constants.AttachLimitOverrideLabel): "63",
+					},
+				},
+			},
+			expVolumeLimit: 63,
 		},
 	}
 
 	for _, tc := range testCases {
 		t.Logf("Test case: %s", tc.name)
 
 		metadataservice.SetMachineType(tc.machineType)
-		res, err := ns.NodeGetInfo(context.Background(), req)
+		volumeLimit, err := ns.getVolumeLimits(context.Background(), tc.node)
 		if err != nil && !tc.expectError {
 			t.Fatalf("Failed to get node info: %v", err)
 		}
 
-		volumeLimit := res.GetMaxVolumesPerNode()
 		if volumeLimit != tc.expVolumeLimit {
 			t.Fatalf("Expected volume limit: %v, got %v, for machine-type: %v",
 				tc.expVolumeLimit, volumeLimit, tc.machineType)
 		}
-
-		t.Logf("Get node info: %v", res)
 	}
 }
 
@@ -1702,3 +1716,119 @@ func TestBlockingFormatAndMount(t *testing.T) {
 	gceDriver := getTestBlockingFormatAndMountGCEDriver(t, readyToExecute)
 	runBlockingFormatAndMount(t, gceDriver, readyToExecute)
 }
+
+func TestGetDiskTypeLabels(t *testing.T) {
+	const (
+		nodeName = "test-node"
+		diskA    = constants.DiskTypeKeyPrefix + "/disk-a"
+		diskB    = constants.DiskTypeKeyPrefix + "/disk-b"
+	)
+
+	testCases := []struct {
+		desc      string
+		node      *corev1.Node
+		want      []string
+		wantError bool
+	}{
+		{
+			desc: "no topology labels",
+			node: &corev1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:   nodeName,
+					Labels: map[string]string{"foo": "bar"},
+				},
+			},
+			want: nil,
+		},
+		{
+			desc: "multiple topology labels",
+			node: &corev1.Node{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: nodeName,
+					Labels: map[string]string{
+						diskA: "true",
+						diskB: "true",
+					},
+				},
+			},
+			want: []string{diskA, diskB},
+		},
+		{
+			desc:      "node not found",
+			node:      nil,
+			wantError: true,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			gceDriver := getTestGCEDriverWithCustomMounter(t, mountmanager.NewFakeSafeMounter(), &NodeServerArgs{})
+			ns := gceDriver.ns
+
+			lbls, err := ns.getDiskTypeLabels(tc.node)
+			if tc.wantError {
+				if err == nil {
+					t.Fatalf("expected error but got none")
+				}
+				return
+			}
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+
+			var got []string
+			for key := range lbls {
+				got = append(got, key)
+			}
+			sort.Strings(got)
+
+			if diff := cmp.Diff(tc.want, got); diff != "" {
+				t.Fatalf("unexpected topology labels (-want +got):\n%s", diff)
+			}
+		})
+	}
+}
+
+func TestNodeGetInfo(t *testing.T) {
+	const (
+		machineType = "n1-standard-4"
+		zone        = "us-central1-b"
+		name        = "test-node"
+	)
+	tests := []struct {
+		desc string
+		want *csi.NodeGetInfoResponse
+	}{
+		{
+			desc: "success",
+			want: &csi.NodeGetInfoResponse{
+				NodeId:            fmt.Sprintf("projects/test-project/zones/%s/instances/%s", zone, name),
+				MaxVolumesPerNode: volumeLimitBig,
+				AccessibleTopology: &csi.Topology{
+					Segments: map[string]string{
+						constants.TopologyKeyZone: zone,
+					},
+				},
+			},
+		},
+	}
+	for _, tc := range tests {
+		t.Run(tc.desc, func(t *testing.T) {
+			gceDriver := getTestGCEDriver(t)
+			ns := gceDriver.ns
+			req := &csi.NodeGetInfoRequest{}
+			metadataservice.SetMachineType(machineType)
+			metadataservice.SetZone(zone)
+			metadataservice.SetName(node)
+
+			got, err := ns.NodeGetInfo(context.Background(), req)
+			if err != nil {
+				t.Fatalf("Failed to get node info: %v", err)
+			}
+
+			if diff := cmp.Diff(tc.want, got, protocmp.Transform()); diff != "" {
+				t.Fatalf("NodeGetInfo() returned unexpected diff (-want +got):\n%s", diff)
+			}
+		})
+	}
+}