--- /dev/null	2017-04-27 11:02:11.338611058 -0700
+++ new/test/java/nio/channels/FileChannel/directio/WriteDirect.java	2017-08-09 14:53:28.706811196 -0700
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8164900
+ * @summary Test FileChannel write with DirectIO
+ */
+
+import java.nio.channels.*;
+import java.nio.*;
+import java.io.*;
+import java.nio.file.Paths;
+import java.nio.file.Path;
+import java.nio.file.Files;
+import java.nio.file.FileStore;
+import java.nio.file.StandardOpenOption;
+import com.sun.nio.file.ExtendedOpenOption;
+
+public class WriteDirect {
+
+   public static void main(String[] args) throws Exception {
+       test1();
+       test2();
+   }
+
+   static void test1() throws Exception {
+        Path p = Files.createTempFile(Paths.get(
+                System.getProperty("test.dir", ".")), "test", null);
+        FileChannel fc = FileChannel.open(p, StandardOpenOption.WRITE,
+                ExtendedOpenOption.DIRECT);
+        FileStore fs = Files.getFileStore(p);
+        int alignment = (int)fs.getBlockSize();
+        ByteBuffer src = ByteBuffer.allocate(4000);
+        try {
+            fc.write(src);
+            throw new RuntimeException("Expected exception not thrown");
+        } catch (IOException e) {
+            if (!e.getMessage().contains("Number of remaining bytes is "
+                                         + "not a multiple of the block size"))
+                throw new Exception("Write failure");
+        } finally {
+            fc.close();
+        }
+
+        Files.delete(p);
+    }
+
+    static void test2() throws Exception {
+        Path p = Files.createTempFile(Paths.get(
+                System.getProperty("test.dir", ".")), "test", null);
+        ByteBuffer[] srcs = new ByteBuffer[4];
+        FileChannel fc = FileChannel.open(p, StandardOpenOption.WRITE,
+                ExtendedOpenOption.DIRECT);
+        FileStore fs = Files.getFileStore(p);
+        int alignment = (int)fs.getBlockSize();
+
+        for (int i=0; i<4; i++) {
+            srcs[i] = ByteBuffer.allocateDirect(4096 + alignment -1)
+                                .alignedSlice(alignment);
+            for (int j=0; j<4096; j++) {
+                srcs[i].put((byte)i);
+            }
+            srcs[i].flip();
+        }
+
+        try {
+            fc.write(srcs, 1, 2);
+        } finally {
+            fc.close();
+        }
+
+        fc = FileChannel.open(p);
+        try {
+            ByteBuffer bb = ByteBuffer.allocateDirect(8192);
+            fc.read(bb);
+            bb.flip();
+            for (int k=0; k<4096; k++) {
+                if (bb.get() != 1)
+                    throw new RuntimeException("Write failure");
+            }
+            for (int m=0; m<4096; m++) {
+                if (bb.get() != 2)
+                    throw new RuntimeException("Write failure");
+            }
+            try {
+                bb.get();
+                throw new RuntimeException("Write failure");
+            } catch (BufferUnderflowException bufe) {
+                // correct result
+            }
+        } finally {
+            fc.close();
+        }
+
+        // eagerly clean-up
+        Files.delete(p);
+    }
+}