81 lines
2.2 KiB
Bash
Executable file
81 lines
2.2 KiB
Bash
Executable file
#!/bin/sh
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#
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# This script illustrates the sequence of operations in configfs to
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# create a very simple LIO iSCSI target with a file or block device
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# backstore.
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#
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# (C) Copyright 2014 Christophe Vu-Brugier <cvubrugier@fastmail.fm>
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#
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print_usage() {
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cat <<EOF
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Usage: $(basename $0) [-p PORTAL] DEVICE|FILE
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Export a block device or a file as an iSCSI target with a single LUN
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EOF
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}
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die() {
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echo $1
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exit 1
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}
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while getopts "hp:" arg; do
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case $arg in
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h) print_usage; exit 0;;
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p) PORTAL=${OPTARG};;
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esac
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done
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shift $(($OPTIND - 1))
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DEVICE=$1
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[ -n "$DEVICE" ] || die "Missing device or file argument"
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[ -b $DEVICE -o -f $DEVICE ] || die "Invalid device or file: ${DEVICE}"
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IQN="iqn.2003-01.org.linux-iscsi.$(hostname):$(basename $DEVICE)"
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[ -n "$PORTAL" ] || PORTAL="0.0.0.0:3260"
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CONFIGFS=/sys/kernel/config
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CORE_DIR=$CONFIGFS/target/core
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ISCSI_DIR=$CONFIGFS/target/iscsi
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# Load the target modules and mount the config file system
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lsmod | grep -q configfs || modprobe configfs
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lsmod | grep -q target_core_mod || modprobe target_core_mod
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mount | grep -q ^configfs || mount -t configfs none $CONFIGFS
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mkdir -p $ISCSI_DIR
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# Create a backstore
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if [ -b $DEVICE ]; then
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BACKSTORE_DIR=$CORE_DIR/iblock_0/data
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mkdir -p $BACKSTORE_DIR
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echo "udev_path=${DEVICE}" > $BACKSTORE_DIR/control
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else
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BACKSTORE_DIR=$CORE_DIR/fileio_0/data
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mkdir -p $BACKSTORE_DIR
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DEVICE_SIZE=$(du -b $DEVICE | cut -f1)
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echo "fd_dev_name=${DEVICE}" > $BACKSTORE_DIR/control
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echo "fd_dev_size=${DEVICE_SIZE}" > $BACKSTORE_DIR/control
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echo 1 > $BACKSTORE_DIR/attrib/emulate_write_cache
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fi
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echo 1 > $BACKSTORE_DIR/enable
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# Create an iSCSI target and a target portal group (TPG)
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mkdir $ISCSI_DIR/$IQN
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mkdir $ISCSI_DIR/$IQN/tpgt_1/
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# Create a LUN
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mkdir $ISCSI_DIR/$IQN/tpgt_1/lun/lun_0
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ln -s $BACKSTORE_DIR $ISCSI_DIR/$IQN/tpgt_1/lun/lun_0/data
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echo 1 > $ISCSI_DIR/$IQN/tpgt_1/enable
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# Create a network portal
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mkdir $ISCSI_DIR/$IQN/tpgt_1/np/$PORTAL
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# Disable authentication
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echo 0 > $ISCSI_DIR/$IQN/tpgt_1/attrib/authentication
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echo 1 > $ISCSI_DIR/$IQN/tpgt_1/attrib/generate_node_acls
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# Allow write access for non authenticated initiators
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echo 0 > $ISCSI_DIR/$IQN/tpgt_1/attrib/demo_mode_write_protect
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echo "Target ${IQN}, portal ${PORTAL} has been created"
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