--- /dev/null
+#! /bin/bash
+# FS QA Test No. 247
+#
+# Test for race between direct I/O and mmap
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2010 Red Hat, Inc. All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would 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 for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#-----------------------------------------------------------------------
+#
+# creator
+owner=lmcilroy@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 7 15
+
+_cleanup()
+{
+ cd /
+ rm -f $tmp.* $testfile
+ wait
+}
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+
+testfile=$TEST_DIR/$seq.$$
+
+loops=500
+iosize=1048576
+
+# Initialise file
+dd if=/dev/zero of=$testfile bs=$iosize count=$loops &> /dev/null
+[ $? -ne 0 ] && exit
+sync
+
+# Direct I/O overwriter
+dd if=/dev/zero of=$testfile oflag=direct bs=$iosize count=$loops conv=notrunc &> /dev/null &
+[ $? -ne 0 ] && exit
+
+# Mmap writer
+start=`expr $loops - 1`
+for i in `seq $start -1 0`
+do
+ offset=`expr $i \* $iosize`
+ $XFS_IO_PROG -F -f -c "mmap -w $offset $iosize" -c "mwrite $offset $iosize" $testfile
+ [ $? -ne 0 ] && exit
+done
+
+wait
+
+echo "Silence is golden."
+
+# success, all done
+status=0
+exit