1#!/bin/sh 2# 3# This script illustrates the sequence of operations in configfs to 4# create a very simple LIO iSCSI target with a file or block device 5# backstore. 6# 7# (C) Copyright 2014 Christophe Vu-Brugier <cvubrugier@fastmail.fm> 8# 9 10print_usage() { 11 cat <<EOF 12Usage: $(basename $0) [-p PORTAL] DEVICE|FILE 13Export a block device or a file as an iSCSI target with a single LUN 14EOF 15} 16 17die() { 18 echo $1 19 exit 1 20} 21 22while getopts "hp:" arg; do 23 case $arg in 24 h) print_usage; exit 0;; 25 p) PORTAL=${OPTARG};; 26 esac 27done 28shift $(($OPTIND - 1)) 29 30DEVICE=$1 31[ -n "$DEVICE" ] || die "Missing device or file argument" 32[ -b $DEVICE -o -f $DEVICE ] || die "Invalid device or file: ${DEVICE}" 33IQN="iqn.2003-01.org.linux-iscsi.$(hostname):$(basename $DEVICE)" 34[ -n "$PORTAL" ] || PORTAL="0.0.0.0:3260" 35 36CONFIGFS=/sys/kernel/config 37CORE_DIR=$CONFIGFS/target/core 38ISCSI_DIR=$CONFIGFS/target/iscsi 39 40# Load the target modules and mount the config file system 41lsmod | grep -q configfs || modprobe configfs 42lsmod | grep -q target_core_mod || modprobe target_core_mod 43mount | grep -q ^configfs || mount -t configfs none $CONFIGFS 44mkdir -p $ISCSI_DIR 45 46# Create a backstore 47if [ -b $DEVICE ]; then 48 BACKSTORE_DIR=$CORE_DIR/iblock_0/data 49 mkdir -p $BACKSTORE_DIR 50 echo "udev_path=${DEVICE}" > $BACKSTORE_DIR/control 51else 52 BACKSTORE_DIR=$CORE_DIR/fileio_0/data 53 mkdir -p $BACKSTORE_DIR 54 DEVICE_SIZE=$(du -b $DEVICE | cut -f1) 55 echo "fd_dev_name=${DEVICE}" > $BACKSTORE_DIR/control 56 echo "fd_dev_size=${DEVICE_SIZE}" > $BACKSTORE_DIR/control 57 echo 1 > $BACKSTORE_DIR/attrib/emulate_write_cache 58fi 59echo 1 > $BACKSTORE_DIR/enable 60 61# Create an iSCSI target and a target portal group (TPG) 62mkdir $ISCSI_DIR/$IQN 63mkdir $ISCSI_DIR/$IQN/tpgt_1/ 64 65# Create a LUN 66mkdir $ISCSI_DIR/$IQN/tpgt_1/lun/lun_0 67ln -s $BACKSTORE_DIR $ISCSI_DIR/$IQN/tpgt_1/lun/lun_0/data 68echo 1 > $ISCSI_DIR/$IQN/tpgt_1/enable 69 70# Create a network portal 71mkdir $ISCSI_DIR/$IQN/tpgt_1/np/$PORTAL 72 73# Disable authentication 74echo 0 > $ISCSI_DIR/$IQN/tpgt_1/attrib/authentication 75echo 1 > $ISCSI_DIR/$IQN/tpgt_1/attrib/generate_node_acls 76 77# Allow write access for non authenticated initiators 78echo 0 > $ISCSI_DIR/$IQN/tpgt_1/attrib/demo_mode_write_protect 79 80echo "Target ${IQN}, portal ${PORTAL} has been created" 81