Add MountOptions field to PV spec

pkg/api/types.go

@@ -455,6 +455,10 @@ type PersistentVolumeSpec struct {
 	// means that this volume does not belong to any StorageClass.
 	// +optional
 	StorageClassName string
+	// A list of mount options, e.g. ["ro", "soft"]. Not validated - mount will
+	// simply fail if one is invalid.
+	// +optional
+	MountOptions []string
 }
 
 // PersistentVolumeReclaimPolicy describes a policy for end-of-life maintenance of persistent volumes