1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5# 6# Copyright (c) 2022 Peter Holm <pho@FreeBSD.org> 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30# Scenario: mount -t nullfs /mnt /mnt 31 32# Seen: 33# [root@mercat1 /home/pho]# ps -lUroot | grep -v grep | grep -E "find|umount" 34# 0 23496 3144 0 52 0 12856 2544 ufs D+ 0 0:00.00 find /mnt -type f -maxdepth 2 -ls 35# 0 23497 3126 6 52 0 12812 2512 mount dr D+ 0 0:00.00 umount /mnt 36# [root@mercat1 /home/pho]# 37 38# Test suggestion by Jason Harmening: 39 40[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 41 42. ../default.cfg 43 44nullfs_srcdir=$mntpoint 45nullfs_dstdir=$mntpoint 46runtime=300 47 48set -e 49mount | grep $mntpoint | grep -q /dev/md && umount -f $mntpoint 50mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart 51mdconfig -a -t swap -s 2g -u $mdstart || exit 1 52newfs $newfs_flags md$mdstart > /dev/null 53mount /dev/md$mdstart $mntpoint 54chmod 777 $mntpoint 55set +e 56 57start=`date '+%s'` 58while [ `date '+%s'` -lt $((start + $runtime)) ]; do 59 find $nullfs_dstdir -type f -maxdepth 2 -ls > \ 60 /dev/null 2>&1 61done & 62 63(cd ../testcases/swap; ./swap -t ${runtime}s -i 20) & 64start=`date '+%s'` 65while [ `date '+%s'` -lt $((start + $runtime)) ]; do 66 mount_nullfs $nullfs_srcdir $nullfs_dstdir 67 opt=$([ `jot -r 1 0 1` -eq 0 ] && echo "-f") 68 while mount | grep nullfs | grep -q ${nullfs_dstdir}; do 69 umount $opt $nullfs_dstdir 70 done 71done > /dev/null 2>&1 72pkill swap 73wait 74n=0 75while mount | grep $mntpoint | grep -q /dev/md; do 76 umount $mntpoint || sleep 1 77 n=$((n + 1)) 78 [ $n -gt 30 ] && { echo FAIL; status=2; } 79done 80mdconfig -d -u $mdstart 81exit 0 82