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Don't run 167 if killall is not installed

Test 167 will leave runaway fsstress processes around in case killall is
not installed and thus make all following tests fail.  This patch checks
for killall beeing installed and error out otherwise.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Merge of master-melb:xfs-cmds:31171a by kenmcd.

  don't run if killall is not installed.

#! /bin/sh
# FSQA Test No. 167
#
# unwritten extent conversion test
#
#-----------------------------------------------------------------------
#  Copyright (c) 2007 Silicon Graphics, Inc.  All Rights Reserved.
#-----------------------------------------------------------------------
#
# creator
owner=dgc@sgi.com

seq=`basename $0`
echo "QA output created by $seq"

killall="/usr/bin/killall"
here=`pwd`
tmp=/tmp/$$
rm -f $seq.full
status=1    # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	killall -r -q -TERM fsstress 2> /dev/null
	sync	# ensures all fsstress processes died
	_cleanup_testdir
}

workout()
{
	procs=100
	nops=15000
	$FSSTRESS_PROG -d $SCRATCH_MNT -p $procs -n $nops $FSSTRESS_AVOID \
		>>$seq.full &
	sleep 2
}

# get standard environment, filters and checks
. ./common.rc
. ./common.filter

# real QA test starts here
_supported_fs xfs
_supported_os Linux

[ -x $killall ] || _notrun "$killall executable not found"

_setup_testdir
_require_scratch
_scratch_mkfs_xfs >/dev/null 2>&1
_scratch_mount

TEST_FILE=$SCRATCH_MNT/test_file
TEST_PROG=$here/src/unwritten_sync
LOOPS=50

echo "*** test unwritten extent conversion under heavy I/O"

workout

rm -f $TEST_FILE
$TEST_PROG $LOOPS $TEST_FILE

echo "     *** test done"

status=0
exit