rc.iscsi

ISCSI user client software.Client would be used to access the IPSAN server.

#! /bin/sh
# chkconfig: 2345 11 20
# description: iSCSI daemon

# For SuSE, the following information is read by "insserv" program and the
# start/stoplinks are installed at appropriate runlevels.
# The network interface and logger has to be up for starting iscsi service
### BEGIN INIT INFO
# Provides: iscsi
# Required-Start: $network $syslog
# Required-Stop:  $network $syslog
# Default-Start:  2 3 5
# Default-Stop:   0 1 6
# Description:    Start iSCSI to allow access to remote SCSI devices
### END INIT INFO

BASEDIR=/
PIDFILE=/var/run/iscsid.pid

#Timeouts to be used during iscsi shutdown
CONNFAILTIMEOUT=30

# Increase the maximum TCP window size in Linux (well, socket memory, which is related) to this number
TCP_WINDOW_SIZE=1048576

PATH="$BASEDIR/sbin:$BASEDIR/bin:/sbin:/bin:/usr/sbin:/usr/bin:$PATH"
export PATH

test -d $BASEDIR || exit 0

iscsi_network_boot()
{
	mtab=/etc/mtab
	iscsirootfs=$(awk '{ if ($1 !~ /^[ \t]*#/ && $2 == "/") { print $1; }}' $mtab)
	
	tmp="/dev/inbpdisk"
	
	dev=$(echo $tmp |sed -e "s/\//\\\\\//g")
	partnr=$(echo $iscsirootfs | sed -e "s/$dev//g")
	
	tmp=$tmp$partnr
	
	if [ ! $tmp = $iscsirootfs ] ; then
	    return 1
	else
	    return 0
	fi
}

shutdown_iscsi_hbas()
{
	for hba in /sys/class/scsi_host/* ; do
	    if [ -f $hba/proc_name ]; then
		name=`awk '{print $1}' < $hba/proc_name`
		if [ $name == "iscsi-sfnet" ]; then
		    echo > $hba/shutdown
		fi 
	    fi
	done
}

set_connfailtimeout()
{
	for hba in /sys/class/scsi_host/* ; do
		if [ -f $hba/proc_name ]; then
			name=`awk '{print $1}' < $hba/proc_name`
			if [ $name == "iscsi-sfnet" ]; then
				if [ -f $hba/connfailtimeout ]; then
					echo "$CONNFAILTIMEOUT" > $hba/connfailtimeout
				fi
			fi
		fi
	done
}


case $1 in
 start)
        # Do sanity checks before we start..
	if [ ! -e /etc/iscsi.conf ]; then
	    echo
	    echo "Error: configuration file /etc/iscsi.conf is missing!"
	    echo "The iSCSI driver has not been correctly installed and cannot start."
	    echo
	    exit 1
	elif [ -s $PIDFILE ] && kill -0 `head -n 1 $PIDFILE` >/dev/null ; then
	    echo "iSCSI daemon already running"
	    echo
	    exit 1
	fi

	grep -Eq '^[^#]' /etc/iscsi.conf
	if [ $? -ne 0 ] ; then
	    echo "Error: Configuration file is empty, unable to start the driver"
	    echo
	    exit 1
	fi

	if [ ! -f /etc/initiatorname.iscsi ] ; then
	    echo
	    echo "Error: InitiatorName file /etc/initiatorname.iscsi is missing!"
	    echo "The iSCSI driver has not been correctly installed and cannot start."
	    echo
	    exit 1
	fi

	# see if we need to generate a unique iSCSI InitiatorName
	# this should only happen if the 
	if grep -q "^GenerateName=yes" /etc/initiatorname.iscsi ; then
	    if [ ! -x $BASEDIR/sbin/iscsi-iname ] ; then
		echo "Error: $BASEDIR/sbin/iscsi-iname does not exist, driver was not successfully installed"
		exit 1;
	    fi 
	    # Generate a unique InitiatorName and save it
	    INAME=`$BASEDIR/sbin/iscsi-iname`
	    if [ "$INAME" != "" ] ; then
		echo "## DO NOT EDIT OR REMOVE THIS FILE!" > /etc/initiatorname.iscsi
		echo "## If you remove this file, the iSCSI daemon will not start." >> /etc/initiatorname.iscsi
		echo "## If you change the InitiatorName, existing access control lists" >> /etc/initiatorname.iscsi
		echo "## may reject this initiator.  The InitiatorName must be unique">> /etc/initiatorname.iscsi
		echo "## for each iSCSI initiator.  Do NOT duplicate iSCSI InitiatorNames." >> /etc/initiatorname.iscsi
		printf "InitiatorName=$INAME\n"  >> /etc/initiatorname.iscsi
		chmod 600 /etc/initiatorname.iscsi
	    else
		echo "Error: failed to generate an iSCSI InitiatorName, driver cannot start."
		echo
		exit 1;
	    fi
        fi

	# make sure there is a valid InitiatorName for the driver
	if ! grep -q "^InitiatorName=[^ \t\n]" /etc/initiatorname.iscsi ; then
	    echo
	    echo "Error: /etc/initiatorname.iscsi does not contain a valid InitiatorName."
	    echo "The iSCSI driver has not been correctly installed and cannot start."
	    echo
	    exit 1
	fi

	# cycle the old log, since we can't guarantee anything is managing
	# it, and in any case it's now only used for debugging info.
	if [ -e /var/log/iscsi.log ] ; then
	    rm -f /var/log/iscsi.log.old
	    mv /var/log/iscsi.log /var/log/iscsi.log.old
	fi
	echo "" > /var/log/iscsi.log
	chmod 0600 /var/log/iscsi.log

	# Increase the maximum TCP window size to something that will give
	# reasonable performance for storage networking.  Use at least a 1 MB
	# max.
	# This only works if we have /proc, but the daemon assumes that anyway,
	# so there's no point trying to use sysctl.

	if [ -e /proc/sys/net/core/rmem_max ] ; then
	    RMEM_MAX=`cat /proc/sys/net/core/rmem_max`
	    if [ $RMEM_MAX -lt $TCP_WINDOW_SIZE ] ; then
		echo "$TCP_WINDOW_SIZE" > /proc/sys/net/core/rmem_max
	    fi
	fi

	if [ -e /proc/sys/net/core/wmem_max ] ; then
	    WMEM_MAX=`cat /proc/sys/net/core/wmem_max`
	    if [ $WMEM_MAX -lt $TCP_WINDOW_SIZE ] ; then
		echo "$TCP_WINDOW_SIZE" > /proc/sys/net/core/wmem_max
	    fi
	fi

	if [ -e /proc/sys/net/ipv4/tcp_rmem ] ; then
	    max=`awk '{print $3}' /proc/sys/net/ipv4/tcp_rmem`
	    if [ $max -lt $TCP_WINDOW_SIZE ] ; then
		min=`awk '{print $1}' /proc/sys/net/ipv4/tcp_rmem`
		default=`awk '{print $2}' /proc/sys/net/ipv4/tcp_rmem`
		echo "$min $default $TCP_WINDOW_SIZE" > /proc/sys/net/ipv4/tcp_rmem
            fi
	fi

	if [ -e /proc/sys/net/ipv4/tcp_wmem ] ; then
	    max=`awk '{print $3}' /proc/sys/net/ipv4/tcp_wmem`
	    if [ $max -lt $TCP_WINDOW_SIZE ] ; then
		min=`awk '{print $1}' /proc/sys/net/ipv4/tcp_wmem`
		default=`awk '{print $2}' /proc/sys/net/ipv4/tcp_wmem`
		echo "$min $default $TCP_WINDOW_SIZE" > /proc/sys/net/ipv4/tcp_wmem
            fi
	fi

	# start
	echo -n "Starting iSCSI: iscsi"

	KD=/lib/modules/`uname -r`/kernel/drivers/scsi/iscsi-sfnet
	EM=/lib/modules/`uname -r`/misc/iscsi_sfnet.ko	#this will be removed after we provide the kernel patch

	if [ -d $KD ] ; then
	    /sbin/modprobe iscsi_sfnet
	elif [ -f $EM ] ; then
	    /sbin/modprobe iscsi_sfnet
	fi

	# By default, we try to load the scsi disk driver module.
	# If SCSI support is in modules, sd_mod won't get loaded
	# until after a /dev/sd* device is opened.  This means no 
	# messages about disks will be logged until a disk device 
	# is opened.  Worse, mounting by label won't work, since
	# it relies on /proc/partitions, which won't get updated
	# until the SCSI disk driver is loaded, creating a circular
	# dependency.  To work around these problems, we try to load 
	# the disk driver here.  If you're not using SCSI disks, 
	# you can comment this out.
	modprobe sd_mod > /dev/null 2>&1

	# Create /dev/iscsictl

	if [ ! -f /dev/iscsictl ]; then
	    while read major device
	    do
	    if [ "$device" == "iscsictl" ]; then
	        mknod /dev/$device c $major 0
	    fi
	    done < /proc/devices
	fi

	echo -n " iscsid"

	if [ "$DEBUG_ISCSI" ] ; then
	    if [ -e /proc/sys/kernel/sysrq ] ; then
		# enable magic SysRq
		echo "1" > /proc/sys/kernel/sysrq
	    fi

	    iscsid -d $DEBUG_ISCSI
	else
	    iscsid
	fi

	# Required for udev to activate/deactivate devices.
	echo "/sbin/hotplug" > /proc/sys/kernel/hotplug	

	# Make sure the K*iscsi scripts get called
	if [ -d /var/lock/subsys ] ; then 
	    touch /var/lock/subsys/iscsi 
	fi
        
        # if we have an iSCSI fstab, process it
        if [ -f /etc/fstab.iscsi ] ; then
	    echo -n " fsck/mount"
	    sleep 6
	    iscsi-mountall
	fi

	echo ""

        ;;
 stop)
	# if iSCSI network boot then exit.
	if iscsi_network_boot ; then
	    echo "Since it is an iSCSI network boot therefore, driver cannot be stopped/restarted"
	    exit 1
	fi

	echo -n "Stopping iSCSI:"

	# We need a low connfailtimeout so that driver shutdown does not hang
	set_connfailtimeout;

	echo -n " sync"
	sync

	# unmount all filesystems on iSCSI devices
	echo -n " umount"
	iscsi-umountall -t -k

	echo -n " sync"
	sync
	sleep 3

	if [ -f $PIDFILE ] ; then
	    echo -n " iscsid"
	    kill -TERM `head -n 1 $PIDFILE`
	    sleep 2
	    killall $BASEDIR/sbin/iscsid > /dev/null 2>&1
	    killall iscsid > /dev/null 2>&1
	    rm -f $PIDFILE
	fi

	# shutdown the kernel module
	shutdown_iscsi_hbas;
	
	if grep -q "iscsi_sfnet" /proc/modules ; then
	    rmmod iscsi_sfnet > /dev/null 2>&1
	fi

	# Remove iscsi control device
	if [ -e /dev/iscsictl ] ; then
	    rm /dev/iscsictl
	fi

	if [ -e /var/lock/subsys/iscsi ] ; then
 	    rm /var/lock/subsys/iscsi
	fi

	echo
	;;
 restart)
	# if iSCSI network boot then exit.
	if iscsi_network_boot ; then
	    echo "Since it is an iSCSI network boot therefore, driver cannot be stopped/restarted"
	    exit 1
	fi

	$0 stop
	$0 start
	;;
 reload)
	if [ -f $PIDFILE ] ; then
	    kill -HUP `head -n 1 $PIDFILE`
	fi
	;;
 status)
	if [ -s $PIDFILE ] && kill -0 `head -n 1 $PIDFILE` >/dev/null ; then
	    echo "iSCSI driver is loaded"
	else
	    echo "iSCSI driver is not loaded"
	fi
	;;
 debug1)
	DEBUG_ISCSI=1
	export DEBUG_ISCSI
	$0 start
	;;
 debug2)
	DEBUG_ISCSI=2
	export DEBUG_ISCSI
	$0 start
	;;
 debug3)
	DEBUG_ISCSI=3
	export DEBUG_ISCSI
	$0 start
	;;
 debug4)
	DEBUG_ISCSI=4
	export DEBUG_ISCSI
	$0 start
	;;
 debug|debug5)
	DEBUG_ISCSI=5
	export DEBUG_ISCSI
	$0 start
	;;
 debug6)
	DEBUG_ISCSI=6
	export DEBUG_ISCSI
	$0 start
	;;
 debug7)
	DEBUG_ISCSI=7
	export DEBUG_ISCSI
	$0 start
	;;
 redebug1)
	$0 stop
	$0 debug1
	;;
 redebug2)
	$0 stop
	$0 debug2
	;;
 redebug3)
	$0 stop
	$0 debug3
	;;
 redebug4)
	$0 stop
	$0 debug4
	;;
 redebug|redebug5)
	$0 stop
	$0 debug5
	;;
 redebug6)
	$0 stop
	$0 debug6
	;;
 redebug7)
	$0 stop
	$0 debug
	;;
 *)
	echo "Usage: /etc/init.d/iscsi { start | stop | restart | status | reload }"

	;;
esac

exit 0