--- old/src/java.base/unix/classes/sun/nio/ch/FileDispatcherImpl.java	2017-08-09 14:53:23.338811146 -0700
+++ new/src/java.base/unix/classes/sun/nio/ch/FileDispatcherImpl.java	2017-08-09 14:53:23.231811145 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2017, 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
@@ -116,6 +116,18 @@
         return false;
     }
 
+    int setDirectIO(FileDescriptor fd, String path)
+    {
+        int result = -1;
+        try {
+            result = setDirect0(fd);
+        } catch (IOException e) {
+            throw new UnsupportedOperationException
+                ("Error setting up DirectIO", e);
+        }
+        return result;
+    }
+
     // -- Native methods --
 
     static native int read0(FileDescriptor fd, long address, int len)
@@ -159,6 +171,8 @@
 
     static native void closeIntFD(int fd) throws IOException;
 
+    static native int setDirect0(FileDescriptor fd) throws IOException;    
+
     static native void init();
 
 }