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#!/bin/sh
#
# Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Demonstrate livelock with "umount -f" seen both with UFS and MSDOS
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
. ../default.cfg
D=$diskimage
dd if=/dev/zero of=$D bs=1m count=1k status=none || exit 1
odir=`pwd`
cd /tmp
sed '1,/^EOF/d' < $odir/$0 > umountf3.c
mycc -o umountf3 -Wall umountf3.c
rm -f umountf3.c
cd $odir
mount | grep "$mntpoint" | grep md$mdstart > /dev/null && umount $mntpoint
mdconfig -l | grep md$mdstart > /dev/null && mdconfig -d -u $mdstart
mdconfig -a -t vnode -f $D -u $mdstart
bsdlabel -w md$mdstart auto
newfs md${mdstart}$part > /dev/null 2>&1
mount /dev/md${mdstart}$part $mntpoint
export RUNDIR=$mntpoint/stressX
for i in `jot 25`; do
(cd /$mntpoint; /tmp/umountf3) &
done
sleep $((4 * 60))
echo "umount -f $mntpoint"
umount -f $mntpoint
while pkill umountf3; do :; done
wait
mdconfig -d -u $mdstart
rm -f $D /tmp/umountf3
exit
EOF
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static unsigned long size = 1024 * 1024 * 2;
int
main(int argc, char **argv)
{
int buf[1024], index, to, n;
int fd;
char file[128];
sprintf(file,"p%06d", getpid());
if ((fd = open(file, O_CREAT | O_RDWR, 0666)) == -1)
err(1, "creat(%s)", file);
to = sizeof(buf);
for (;;) {
index = 0;
while (index < size) {
if (index + to > size)
to = size - index;
index += to;
if (write(fd, buf, to) != to)
err(1, "write(%s), %s:%d", file, __FILE__, __LINE__);
}
if (lseek(fd, 0, 0) == -1)
err(1, "lseek");
index = 0;
while (index < size) {
if (index + to > size)
to = size - index;
if ((n = read(fd, buf, to)) != to)
err(1, "rw read(%d, %d, %d). %s.%d", n, to, index, __FILE__, __LINE__);
index += to;
}
if (lseek(fd, 0, 0) == -1)
err(1, "lseek");
}
if (close(fd) == -1)
err(1, "close(%s), %s:%d", file, __FILE__, __LINE__);
if (unlink(file) == -1)
err(1, "unlink(%s), %s:%d", file, __FILE__, __LINE__);
return (0);
}
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