#! /bin/sh
# Copyright (c) 2005 SuSE GmbH Nuernberg, Germany.
#
# Author: Hannes Reinecke <feedback@suse.de>
#
# init.d/boot.multipath
#
### BEGIN INIT INFO
# Provides:          boot.multipath
# Required-Start:    boot.device-mapper boot.udev
# Required-Stop:
# Default-Start:     B
# Default-Stop:
# Description:       Create multipath device targets
### END INIT INFO

PATH=/bin:/usr/bin:/sbin:/usr/sbin
PROGRAM=/sbin/multipath

# Set the maximum number of open files
MAX_OPEN_FDS=4096

test -x $PROGRAM || exit 5

# Shell functions sourced from /etc/rc.status:
#      rc_check         check and set local and overall rc status
#      rc_status        check and set local and overall rc status
#      rc_status -v     ditto but be verbose in local rc status
#      rc_status -v -r  ditto and clear the local rc status
#      rc_failed        set local and overall rc status to failed
#      rc_reset         clear local rc status (overall remains)
#      rc_exit          exit appropriate to overall rc status
. /etc/rc.status

# First reset status of this service
rc_reset

# Return values acc. to LSB for all commands but status:
# 0 - success
# 1 - misc error
# 2 - invalid or excess args
# 3 - unimplemented feature (e.g. reload)
# 4 - insufficient privilege
# 5 - program not installed
# 6 - program not configured
# 7 - program is not running
# 
# Note that starting an already running service, stopping
# or restarting a not-running service as well as the restart
# with force-reload (in case signalling is not supported) are
# considered a success.

case "$1" in
    start)
	echo -n "Creating multipath targets"
	# Check whether multipath daemon is already running
	if /sbin/multipathd -k"list paths" > /dev/null 2>&1 ; then
	    echo -n " (multipathd running)"
	    rc_status -v
	    rc_exit
	fi

	# Load prerequisite module
	modprobe dm-multipath
	
	# Be a chicken and flush all existing maps
	$PROGRAM -F

	# Clear /dev/disk/by-name/ prior to start-up; multipath will
	# recreate them.
	rm -f /dev/disk/by-name/* 2>&1 >/dev/null

	# Set the maximum number of open files
	if [ -n "$MAX_OPEN_FDS" ] ; then
	    ulimit -n $MAX_OPEN_FDS
	fi

	# Start the program directly as checkproc doesn't work here
	$PROGRAM -v 0

	# Create all partitions which might have been missing
	for map in $(/sbin/dmsetup ls --target multipath | sed '/No devices/d' | sort -n +2 | sed -n 's/.*, \(.*\))/\1/p' ) ; do
	    wait=5
	    while [ $wait -gt 0 ] ; do
		[ -e /dev/dm-$map ] && break
		wait=$((wait - 1))
		sleep 1;
	    done
	    if [ $wait -le 0 ] ; then
		echo -n "timeout waiting for devices"
		rc_failed 1
		break;
	    fi
	    /sbin/kpartx -a -p _part /dev/dm-$map
	done

	# Remember status and be verbose
	rc_status -v
	sleep 1
	;;
    stop)
	echo -n "Removing multipath targets:"

	# Flush all existing maps
	$PROGRAM -F

	rc_failed 0
	rc_status -v
	;;
    status)
	echo -n "Checking multipath targets: "
	# Display active multipath tables
	tblnum=$(/sbin/dmsetup ls --target multipath | sed '/No devices/d' | wc --lines)
	if [ "$tblnum" ] && [ $tblnum -gt 0 ] ; then
	    echo -n "($tblnum multipath devices) "
	    rc_failed 0
	else
	    rc_failed 3
	fi
	rc_status -v
	;;
    *)
	echo "Usage: $0 {start|stop}"
	exit 1
	;;
esac
rc_exit