#! /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:     boot.device-mapper boot.udev
# Should-Start:      boot.xdrsetsite
# Should-Stop:       boot.xdrsetsite
# Default-Start:     B
# Default-Stop:
# Short-Description:       Create multipath device targets
# Description:       Setup initial multipath device-mapper 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

# Number of seconds to wait for disks and partitions
MPATH_DEVICE_TIMEOUT=30

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)
	# Check for existing multipath mappings
	if dmsetup table --target multipath | grep -q multipath ; then
	    # Multipath active, start daemon
	    exec /etc/init.d/multipathd $1
	fi

	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
	
	# 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
	$PROGRAM -v 0
	echo -n " (waiting for udev)"
	# Wait for all multipathed devices to appear
	maplist=$(/sbin/dmsetup ls --target multipath | sed '/No devices/d' | sed -n 's/\(^[^ ()]*\)[\t ]*.*/\1/p')
	wait=$MPATH_DEVICE_TIMEOUT
	while [ $wait -gt 0 ] ; do
	    num=0
	    for map in $maplist; do
		[ -e /dev/disk/by-id/dm-name-$map ] && continue
		num=$((num + 1))
	    done
	    [ $num -eq 0 ] && break
	    wait=$((wait - 1))
	    sleep 1;
	done
	if [ $wait -le 0 ] ; then
	    echo -n " timeout: $num devices left"
	    rc_failed 1
	else
	    # Reset to wait for partitions
	    wait=$MPATH_DEVICE_TIMEOUT
	fi
        # Wait for all partitions on multipathed devices
	while [ $wait -gt 0 ] ; do
	    num=0
	    for map in $maplist ; do
		[ -e /dev/disk/by-id/dm-name-$map ] || continue
		partlist=$(/sbin/kpartx -l -p _part /dev/disk/by-id/dm-name-$map | sed 's/\([^ ]*\) :.*/\1/p')
		for part in $partlist; do
		    [ -e /dev/disk/by-id/dm-name-$part ] && continue
		    num$((num + 1))
		done
	    done
	    [ $num -eq 0 ] && break
	    wait=$((wait - 1))
	    sleep 1;
	done
	if [ $wait -le 0 ] ; then
	    echo -n "timeout: $num partitions left"
	    rc_failed 1
	fi

	# Remember status and be verbose
	rc_status -v
	;;
    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
	;;
    reload)
	$0 stop
	$0 start
	;;
    *)
	echo "Usage: $0 {start|stop|status}"
	exit 1
	;;
esac
rc_exit