#!/bin/bash
#
#	/etc/rc.d/init.d/multipathd
#
# Starts the multipath daemon
#
# chkconfig: - 06 87
# description: Manage device-mapper multipath devices
# processname: multipathd

DAEMON=/sbin/multipathd
prog=`basename $DAEMON`
initdir=/etc/rc.d/init.d
lockdir=/var/lock/subsys
sysconfig=/etc/sysconfig
syspath=/sys/block

 
system=redhat
 
if [ $system = redhat ]; then
	# Source function library.
	. $initdir/functions
fi
 
test -r $sysconfig/$prog && . $sysconfig/$prog

RETVAL=0

teardown_slaves()
{
pushd $1 > /dev/null
if [ -d "slaves" ]; then
for slave in slaves/*;
do
	if [ "$slave" = "slaves/*" ]; then
		read dev <  $1/dev
		tablename=`dmsetup table --target multipath | sed -n "s/\(.*\): .* $dev .*/\1/p"`
		if ! [ -z $tablename ]; then
			echo "Root is on a multipathed device, multipathd can not be stopped"
			exit 1
		fi
	else
		local_slave=`readlink -f $slave`;
		teardown_slaves $local_slave;
	fi
	done
		
else
		read dev <  $1/dev
		tablename=`dmsetup table --target multipath | sed -n "s/\(.*\): .* $dev .*/\1/p"`
		if ! [ -z $tablename ]; then
			echo "Root is on a multipathed device, multipathd can not be stopped"
			exit 1
		fi
fi
popd > /dev/null
}

#
# See how we were called.
#

start() {
	test -x $DAEMON || exit 5
	echo -n $"Starting $prog daemon: "
	daemon $DAEMON
	RETVAL=$?
	[ $RETVAL -eq 0 ] && touch $lockdir/$prog
	echo
}

check_root() {
        root_dev=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $1; }}' /etc/mtab)
	dm_num=`dmsetup info -c --noheadings -o minor $root_dev 2> /dev/null`
	if [ $? -eq 0 ]; then
		root_dm_device="dm-$dm_num"
		[ -d $syspath/$root_dm_device ] && teardown_slaves $syspath/$root_dm_device
	fi
}

stop() {
	echo -n $"Stopping $prog daemon: "
	killproc $DAEMON
	RETVAL=$?
	[ $RETVAL -eq 0 ] && rm -f $lockdir/$prog
	echo
}

force_queue_without_daemon() {
	$DAEMON -k"forcequeueing daemon"
}

restart() {
	force_queue_without_daemon
	stop
	start
}	

reload() {
	echo -n "Reloading $prog: "
	trap "" SIGHUP
	killproc $DAEMON -HUP
	RETVAL=$?
	echo
}	

case "$1" in
start)
	start
	;;
stop)
	check_root
	stop
	;;
reload)
	reload
	;;
restart)
	restart
	;;
condrestart)
	if [ -f $lockdir/$prog ]; then
	    restart
	fi
	;;
status)
	status $prog
	RETVAL=$?
	;;
*)
	echo $"Usage: $0 {start|stop|status|restart|condrestart|reload}"
	RETVAL=3
esac

exit $RETVAL