#! /bin/sh
### BEGIN INIT INFO
# Provides:          multipath-tools
# Required-Start:    udev $local_fs $remote_fs $syslog
# Required-Stop:     udev $local_fs $remote_fs $syslog
# Should-Start:      iscsi
# Should-Stop:       iscsi
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: multipath daemon
# Description:
### END INIT INFO

PATH=/sbin:/bin:/usr/sbin/:/usr/bin
DAEMON=/sbin/multipathd
NAME=multipathd
DESC="multipath daemon"
syspath=/sys/block

test -x $DAEMON || exit 0

. /lib/lsb/init-functions

if [ -f /etc/default/multipath-tools ] ; then
	. /etc/default/multipath-tools
fi

teardown_slaves()
{
cd $1; 
if [ -d "slaves" ]; then
for slave in slaves/*;
do
	if [ "$slave" = "slaves/*" ]; then
		read dev <  $1/dev
		tablename=$(dmsetup table --target multipath | sed -n "s/\(.*\): .* $dev .*/\1/p")
		if ! [ -z $tablename ]; then
			log_daemon_msg "Root is on a multipathed device, multipathd can not be stopped"
			DONT_STOP_MPATHD=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
			log_daemon_msg "Root is on a multipathed device, multipathd can not be stopped"
			DONT_STOP_MPATHD=1
		fi
fi
}


case "$1" in
  start)
	log_daemon_msg "Starting $DESC" "$NAME"
	modprobe -a scsi_dh_alua scsi_dh_emc scsi_dh_rdac dm-multipath 2> /dev/null || true
	start-stop-daemon --oknodo --start --quiet --pidfile /var/run/$NAME.pid --exec $DAEMON -- $DAEMON_OPTS
	log_end_msg $?
	;;
  stop)
	DONT_STOP_MPATHD=0
	root_dev=$(awk '{ if ($1 !~ /^[ \t]*#/ && $1 ~ /\// && $2 == "/") { print $1; }}' /etc/mtab)
	if [ -n "$root_dev" ]; then
		dm_num=$(dmsetup info -c --noheadings -o minor $root_dev 2>/dev/null)
	else
		dm_num=
	fi
	if [ $? -ne 0 -o -z "$dm_num" ]; then
		# Looks like we couldn't find a device mapper root device
		# But we shouldn't bail out here, otherwise the stop target and the
		# upgrade processes will break. See DBUG #674733
		:
	else
		root_dm_device="dm-$dm_num"
		[ -d "$syspath/$root_dm_device" ] && teardown_slaves $syspath/$root_dm_device
	fi

	if [ x$DONT_STOP_MPATHD = x0 ]; then
		log_daemon_msg "Stopping $DESC" "$NAME"
		start-stop-daemon --oknodo --stop --quiet --pidfile /var/run/$NAME.pid --exec $DAEMON
		log_end_msg $?
	fi
	;;
  status)
	status_of_proc -p /var/run/$NAME.pid $DAEMON $NAME && exit 0 || exit $?
	;;
  reload|force-reload)
	log_daemon_msg "Reloading $DESC" "$NAME"
	start-stop-daemon --stop --signal 1 --quiet --pidfile /var/run/$NAME.pid --exec $DAEMON
	log_end_msg $?
	;;
  restart|force-reload)
  	$0 stop
	sleep 1
	$0 start
	;;
  *)
	N=/etc/init.d/multipath-tools
	echo "Usage: $N {start|stop|status|restart|reload|force-reload}" >&2
	exit 1
	;;
esac

exit 0