Add c4d to gen4 attach limit list

Author: hajiler

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

@@ -848,7 +848,7 @@ func (ns *GCENodeServer) GetVolumeLimits(ctx context.Context) (int64, error) {
 	}
 
 	// Process gen4 machine attach limits
-	gen4MachineTypesPrefix := []string{"c4a-", "c4-", "n4-"}
+	gen4MachineTypesPrefix := []string{"c4a-", "c4-", "n4-", "c4d-"}
 	for _, gen4Prefix := range gen4MachineTypesPrefix {
 		if strings.HasPrefix(machineType, gen4Prefix) {
 			machineTypeSlice := strings.Split(machineType, "-")

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

@@ -340,6 +340,11 @@ func TestNodeGetVolumeLimits(t *testing.T) {
 			machineType:    "c4a-standard-32-lssd",
 			expVolumeLimit: 49,
 		},
+		{
+			name:           "c4d-standard-48",
+			machineType:    "c4d-standard-2",
+			expVolumeLimit: volumeLimitSmall,
+		},
 	}
 
 	for _, tc := range testCases {