#!/bin/sh

#
# Copyright (c) 2014 EMC Corp.
# 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.
#

# Parallel mount and umount of file systems
# "panic: Bad link elm 0xfffff8052a20cc00 prev->next != elm" seen:
# http://people.freebsd.org/~pho/stress/log/crossmp3.txt
# Fixed in r269853

# panic: softdep_waitidle: work added after flush:
# http://people.freebsd.org/~pho/stress/log/crossmp3-2.txt, fixed by r273967.

[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1

. ../default.cfg

CONT=/tmp/crossmp3.continue
if [ $# -eq 0 ]; then
	N=`sysctl -n hw.ncpu`
	usermem=`sysctl -n hw.usermem`
	[ `sysctl -n vm.swap_total` -eq 0 ] && usermem=$((usermem / 2))
	size=$((usermem / 1024 / 1024 / N))
	echo "Using $N memory disks of size $size MB."

	mounts=$N		# Number of parallel scripts

	for i in `jot $mounts`; do
		m=$(( i + mdstart - 1 ))
		[ ! -d ${mntpoint}$m ] &&
		    { mkdir ${mntpoint}$m; chmod 755 ${mntpoint}$m; }
		mount | grep "${mntpoint}$m " | grep -q md$m &&
		    umount ${mntpoint}$m
		mdconfig -l | grep -q md$m && mdconfig -d -u $m

		mdconfig -a -t swap -s ${size}m -u $m
		newfs $newfs_flags md${m} > /dev/null 2>&1
	done

	# start the parallel tests
	touch $CONT
	for i in `jot $mounts`; do
		m=$(( i + mdstart - 1 ))
		./$0 $m &
		./$0 find &
	done
	wait

	for i in `jot $mounts`; do
		m=$(( i + mdstart - 1 ))
		while mount | grep -q "on ${mntpoint}$m "; do
		    umount ${mntpoint}$m && break
		    sleep 1
		done
		mdconfig -d -u $m
	done
	exit 0
else
	if [ $1 = find ]; then
		while [ -f $CONT ]; do
			find ${mntpoint}* -type f > /dev/null 2>&1
		done
	else
		export runRUNTIME=20s
		# The test: Parallel mount and unmounts
		start=`date +%s`
		for i in `jot 3`; do
			m=$1
			mount /dev/md${m} ${mntpoint}$m &&
			   chmod 777 ${mntpoint}$m
			export RUNDIR=${mntpoint}$m/stressX
			export CTRLDIR=${mntpoint}$m/stressX.control
			(cd ${mntpoint}$m && find . -delete)
			su $testuser -c 'cd ..; ./run.sh disk.cfg' > \
			    /dev/null 2>&1

			while mount | grep -q "on ${mntpoint}$m "; do
				opt=$([ $((`date '+%s'` % 2)) -eq 0 ] && echo "-f")
				umount $opt ${mntpoint}$m > /dev/null 2>&1
				[ -f $CONT ] || break 2
			done
			[ $((`date +%s` - start)) -gt 600 ] && 
			    { echo "Timed out"; s=1; }
		done
		rm -f $CONT
	fi
	exit $s
fi