--- a/src/java.base/macosx/classes/sun/nio/fs/BsdNativeDispatcher.java	Fri Sep 13 18:54:43 2019 -0400
+++ b/src/java.base/macosx/classes/sun/nio/fs/BsdNativeDispatcher.java	Fri Sep 13 16:03:31 2019 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -51,6 +51,20 @@
     */
     static native void endfsstat(long iter) throws UnixException;
 
+    /**
+     * int statfs(const char *path, struct statfs *buf);
+     * returns buf->f_mntonname (directory on which mounted)
+     */
+    static byte[] getmntonname(UnixPath path) throws UnixException {
+        NativeBuffer pathBuffer = copyToNativeBuffer(path);
+        try {
+            return getmntonname0(pathBuffer.address());
+        } finally {
+            pathBuffer.release();
+        }
+    }
+    static native byte[] getmntonname0(long pathAddress) throws UnixException;
+
     // initialize field IDs
     private static native void initIDs();