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38d454f0 CVB |
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 | ||
10 | print_usage() { | |
11 | cat <<EOF | |
12 | Usage: $(basename $0) [-p PORTAL] DEVICE|FILE | |
13 | Export a block device or a file as an iSCSI target with a single LUN | |
14 | EOF | |
15 | } | |
16 | ||
17 | die() { | |
18 | echo $1 | |
19 | exit 1 | |
20 | } | |
21 | ||
22 | while getopts "hp:" arg; do | |
23 | case $arg in | |
24 | h) print_usage; exit 0;; | |
25 | p) PORTAL=${OPTARG};; | |
26 | esac | |
27 | done | |
28 | shift $(($OPTIND - 1)) | |
29 | ||
30 | DEVICE=$1 | |
31 | [ -n "$DEVICE" ] || die "Missing device or file argument" | |
32 | [ -b $DEVICE -o -f $DEVICE ] || die "Invalid device or file: ${DEVICE}" | |
33 | IQN="iqn.2003-01.org.linux-iscsi.$(hostname):$(basename $DEVICE)" | |
34 | [ -n "$PORTAL" ] || PORTAL="0.0.0.0:3260" | |
35 | ||
36 | CONFIGFS=/sys/kernel/config | |
37 | CORE_DIR=$CONFIGFS/target/core | |
38 | ISCSI_DIR=$CONFIGFS/target/iscsi | |
39 | ||
40 | # Load the target modules and mount the config file system | |
41 | lsmod | grep -q configfs || modprobe configfs | |
42 | lsmod | grep -q target_core_mod || modprobe target_core_mod | |
43 | mount | grep -q ^configfs || mount -t configfs none $CONFIGFS | |
44 | mkdir -p $ISCSI_DIR | |
45 | ||
46 | # Create a backstore | |
47 | if [ -b $DEVICE ]; then | |
48 | BACKSTORE_DIR=$CORE_DIR/iblock_0/data | |
49 | mkdir -p $BACKSTORE_DIR | |
50 | echo "udev_path=${DEVICE}" > $BACKSTORE_DIR/control | |
51 | else | |
52 | BACKSTORE_DIR=$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 | |
58 | fi | |
59 | echo 1 > $BACKSTORE_DIR/enable | |
60 | ||
61 | # Create an iSCSI target and a target portal group (TPG) | |
62 | mkdir $ISCSI_DIR/$IQN | |
63 | mkdir $ISCSI_DIR/$IQN/tpgt_1/ | |
64 | ||
65 | # Create a LUN | |
66 | mkdir $ISCSI_DIR/$IQN/tpgt_1/lun/lun_0 | |
67 | ln -s $BACKSTORE_DIR $ISCSI_DIR/$IQN/tpgt_1/lun/lun_0/data | |
68 | echo 1 > $ISCSI_DIR/$IQN/tpgt_1/enable | |
69 | ||
70 | # Create a network portal | |
71 | mkdir $ISCSI_DIR/$IQN/tpgt_1/np/$PORTAL | |
72 | ||
73 | # Disable authentication | |
74 | echo 0 > $ISCSI_DIR/$IQN/tpgt_1/attrib/authentication | |
75 | echo 1 > $ISCSI_DIR/$IQN/tpgt_1/attrib/generate_node_acls | |
76 | ||
77 | # Allow write access for non authenticated initiators | |
78 | echo 0 > $ISCSI_DIR/$IQN/tpgt_1/attrib/demo_mode_write_protect | |
79 | ||
80 | echo "Target ${IQN}, portal ${PORTAL} has been created" |