pkg/mount: add more sharesubtree options

Signed-off-by: Vincent Batts <vbatts@redhat.com>

mount/sharedsubtree_linux.go

@@ -2,7 +2,39 @@
 
 package mount
 
+func MakeShared(mountPoint string) error {
+	return ensureMountedAs(mountPoint, "shared")
+}
+
+func MakeRShared(mountPoint string) error {
+	return ensureMountedAs(mountPoint, "rshared")
+}
+
 func MakePrivate(mountPoint string) error {
+	return ensureMountedAs(mountPoint, "private")
+}
+
+func MakeRPrivate(mountPoint string) error {
+	return ensureMountedAs(mountPoint, "rprivate")
+}
+
+func MakeSlave(mountPoint string) error {
+	return ensureMountedAs(mountPoint, "slave")
+}
+
+func MakeRSlave(mountPoint string) error {
+	return ensureMountedAs(mountPoint, "rslave")
+}
+
+func MakeUnbindable(mountPoint string) error {
+	return ensureMountedAs(mountPoint, "unbindable")
+}
+
+func MakeRUnbindable(mountPoint string) error {
+	return ensureMountedAs(mountPoint, "runbindable")
+}
+
+func ensureMountedAs(mountPoint, options string) error {
 	mounted, err := Mounted(mountPoint)
 	if err != nil {
 		return err
@@ -13,6 +45,10 @@ func MakePrivate(mountPoint string) error {
 			return err
 		}
 	}
+	mounted, err = Mounted(mountPoint)
+	if err != nil {
+		return err
+	}
 
-	return ForceMount("", mountPoint, "none", "private")
+	return ForceMount("", mountPoint, "none", options)
 }