1*4882a593Smuzhiyun#!/bin/sh 2*4882a593Smuzhiyun# 3*4882a593Smuzhiyun# This script illustrates the sequence of operations in configfs to 4*4882a593Smuzhiyun# create a very simple LIO iSCSI target with a file or block device 5*4882a593Smuzhiyun# backstore. 6*4882a593Smuzhiyun# 7*4882a593Smuzhiyun# (C) Copyright 2014 Christophe Vu-Brugier <cvubrugier@fastmail.fm> 8*4882a593Smuzhiyun# 9*4882a593Smuzhiyun 10*4882a593Smuzhiyunprint_usage() { 11*4882a593Smuzhiyun cat <<EOF 12*4882a593SmuzhiyunUsage: $(basename $0) [-p PORTAL] DEVICE|FILE 13*4882a593SmuzhiyunExport a block device or a file as an iSCSI target with a single LUN 14*4882a593SmuzhiyunEOF 15*4882a593Smuzhiyun} 16*4882a593Smuzhiyun 17*4882a593Smuzhiyundie() { 18*4882a593Smuzhiyun echo $1 19*4882a593Smuzhiyun exit 1 20*4882a593Smuzhiyun} 21*4882a593Smuzhiyun 22*4882a593Smuzhiyunwhile getopts "hp:" arg; do 23*4882a593Smuzhiyun case $arg in 24*4882a593Smuzhiyun h) print_usage; exit 0;; 25*4882a593Smuzhiyun p) PORTAL=${OPTARG};; 26*4882a593Smuzhiyun esac 27*4882a593Smuzhiyundone 28*4882a593Smuzhiyunshift $(($OPTIND - 1)) 29*4882a593Smuzhiyun 30*4882a593SmuzhiyunDEVICE=$1 31*4882a593Smuzhiyun[ -n "$DEVICE" ] || die "Missing device or file argument" 32*4882a593Smuzhiyun[ -b $DEVICE -o -f $DEVICE ] || die "Invalid device or file: ${DEVICE}" 33*4882a593SmuzhiyunIQN="iqn.2003-01.org.linux-iscsi.$(hostname):$(basename $DEVICE)" 34*4882a593Smuzhiyun[ -n "$PORTAL" ] || PORTAL="0.0.0.0:3260" 35*4882a593Smuzhiyun 36*4882a593SmuzhiyunCONFIGFS=/sys/kernel/config 37*4882a593SmuzhiyunCORE_DIR=$CONFIGFS/target/core 38*4882a593SmuzhiyunISCSI_DIR=$CONFIGFS/target/iscsi 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun# Load the target modules and mount the config file system 41*4882a593Smuzhiyunlsmod | grep -q configfs || modprobe configfs 42*4882a593Smuzhiyunlsmod | grep -q target_core_mod || modprobe target_core_mod 43*4882a593Smuzhiyunmount | grep -q ^configfs || mount -t configfs none $CONFIGFS 44*4882a593Smuzhiyunmkdir -p $ISCSI_DIR 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun# Create a backstore 47*4882a593Smuzhiyunif [ -b $DEVICE ]; then 48*4882a593Smuzhiyun BACKSTORE_DIR=$CORE_DIR/iblock_0/data 49*4882a593Smuzhiyun mkdir -p $BACKSTORE_DIR 50*4882a593Smuzhiyun echo "udev_path=${DEVICE}" > $BACKSTORE_DIR/control 51*4882a593Smuzhiyunelse 52*4882a593Smuzhiyun BACKSTORE_DIR=$CORE_DIR/fileio_0/data 53*4882a593Smuzhiyun mkdir -p $BACKSTORE_DIR 54*4882a593Smuzhiyun DEVICE_SIZE=$(du -b $DEVICE | cut -f1) 55*4882a593Smuzhiyun echo "fd_dev_name=${DEVICE}" > $BACKSTORE_DIR/control 56*4882a593Smuzhiyun echo "fd_dev_size=${DEVICE_SIZE}" > $BACKSTORE_DIR/control 57*4882a593Smuzhiyun echo 1 > $BACKSTORE_DIR/attrib/emulate_write_cache 58*4882a593Smuzhiyunfi 59*4882a593Smuzhiyunecho 1 > $BACKSTORE_DIR/enable 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun# Create an iSCSI target and a target portal group (TPG) 62*4882a593Smuzhiyunmkdir $ISCSI_DIR/$IQN 63*4882a593Smuzhiyunmkdir $ISCSI_DIR/$IQN/tpgt_1/ 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun# Create a LUN 66*4882a593Smuzhiyunmkdir $ISCSI_DIR/$IQN/tpgt_1/lun/lun_0 67*4882a593Smuzhiyunln -s $BACKSTORE_DIR $ISCSI_DIR/$IQN/tpgt_1/lun/lun_0/data 68*4882a593Smuzhiyunecho 1 > $ISCSI_DIR/$IQN/tpgt_1/enable 69*4882a593Smuzhiyun 70*4882a593Smuzhiyun# Create a network portal 71*4882a593Smuzhiyunmkdir $ISCSI_DIR/$IQN/tpgt_1/np/$PORTAL 72*4882a593Smuzhiyun 73*4882a593Smuzhiyun# Disable authentication 74*4882a593Smuzhiyunecho 0 > $ISCSI_DIR/$IQN/tpgt_1/attrib/authentication 75*4882a593Smuzhiyunecho 1 > $ISCSI_DIR/$IQN/tpgt_1/attrib/generate_node_acls 76*4882a593Smuzhiyun 77*4882a593Smuzhiyun# Allow write access for non authenticated initiators 78*4882a593Smuzhiyunecho 0 > $ISCSI_DIR/$IQN/tpgt_1/attrib/demo_mode_write_protect 79*4882a593Smuzhiyun 80*4882a593Smuzhiyunecho "Target ${IQN}, portal ${PORTAL} has been created" 81