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diff --git a/cddl/contrib/dtracetoolkit/Disk/iofile.d b/cddl/contrib/dtracetoolkit/Disk/iofile.d
new file mode 100755
index 000000000000..255057a7ebd7
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+++ b/cddl/contrib/dtracetoolkit/Disk/iofile.d
@@ -0,0 +1,79 @@
+#!/usr/sbin/dtrace -s
+/*
+ * iofile.d - I/O wait time by filename and process.
+ *            Written using DTrace (Solaris 10 3/05).
+ *
+ * This prints the total I/O wait times for each filename by process.
+ * This can help determine why an application is performing poorly by
+ * identifying which file they are waiting on, and the total times.
+ * Both disk and NFS I/O are measured.
+ *
+ * $Id: iofile.d 3 2007-08-01 10:50:08Z brendan $
+ *
+ * USAGE:	iofile.d	# wait, then hit Ctrl-C to end
+ *
+ * FIELDS:
+ *		PID		Process ID
+ *		CMD		Process name
+ *		TIME		Total wait time for disk events, us
+ *		FILE		File pathname
+ *
+ * BASED ON: /usr/demo/dtrace/iocpu.d
+ *
+ * SEE ALSO: iosnoop, iotop
+ *
+ * PORTIONS: Copyright (c) 2005, 2006 Brendan Gregg.
+ *
+ * CDDL HEADER START
+ *
+ *  The contents of this file are subject to the terms of the
+ *  Common Development and Distribution License, Version 1.0 only
+ *  (the "License").  You may not use this file except in compliance
+ *  with the License.
+ *
+ *  You can obtain a copy of the license at Docs/cddl1.txt
+ *  or http://www.opensolaris.org/os/licensing.
+ *  See the License for the specific language governing permissions
+ *  and limitations under the License.
+ *
+ * CDDL HEADER END
+ *
+ * 24-Jul-2005	Brendan Gregg	Created this.
+ * 20-Apr-2006	   "      "	Last update.
+ */
+
+#pragma D option quiet
+
+/* print header */
+dtrace:::BEGIN
+{
+	printf("Tracing... Hit Ctrl-C to end.\n");
+}
+
+/* save time at start */
+io:::wait-start
+{
+	self->start = timestamp;
+}
+
+/* process event */
+io:::wait-done
+/self->start/
+{
+	/*
+	 * wait-done is used as we are measing wait times. It also
+	 * is triggered when the correct thread is on the CPU, obviating
+	 * the need to link process details to the start event.
+	 */
+	this->elapsed = timestamp - self->start;
+	@files[pid, execname, args[2]->fi_pathname] = sum(this->elapsed);
+	self->start = 0;
+}
+
+/* print report */
+dtrace:::END
+{
+	normalize(@files, 1000);
+	printf("%6s %-12s %8s %s\n", "PID", "CMD", "TIME", "FILE");
+	printa("%6d %-12.12s %@8d %s\n", @files);
+}