Add rwtest case that Steve found an unwritten extent/direct IO bug with.

rwtest case that Steve found an unwritten extent/direct IO bug with.

080

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+#! /bin/sh
+# XFS QA Test No. 080
+#
+# rwtest (iogen|doio)
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
+# 
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of version 2 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.
+# 
+# Further, this software is distributed without any warranty that it is
+# free of the rightful claim of any third person regarding infringement
+# or the like.  Any license provided herein, whether implied or
+# otherwise, applies only to this software file.  Patent licenses, if
+# any, provided herein do not apply to combinations of this program with
+# other software, or any other product whatsoever.
+# 
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write the Free Software Foundation, Inc., 59
+# Temple Place - Suite 330, Boston MA 02111-1307, USA.
+# 
+# Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+# Mountain View, CA  94043, or:
+# 
+# http://www.sgi.com 
+# 
+# For further information regarding this notice, see: 
+# 
+# http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+#-----------------------------------------------------------------------
+#
+# creator
+owner=nathans@sgi.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+quiet=-q
+clean=-c
+
+export here
+cd $TEST_DIR
+echo
+
+# real QA test starts here
+
+$here/ltp/rwtest.sh $quiet $clean -i 2000 -f direct,buffered,sync
+status=$?
+[ $status -ne 0 ] && exit
+echo Completed rwtest pass 1 successfully.
+
+#$here/ltp/rwtest.sh $quiet $clean -Dv -i 1000 -n 10 -f direct,buffered,sync
+#[ $status -ne 0 ] && exit
+#echo Completed rwtest pass 2 successfully.
+
+exit