new package tgt

This patch provides userspace iSCSI target support.

https://dev.openwrt.org/ticket/8798

Signed-off-by: Maxim Storchak <m.storchak@gmail.com>
Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@40703 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/tgt/files/etc/config/tgt

@@ -0,0 +1,38 @@
+config target 1
+	option name 'iqn.2012-06.org.openwrt:target1'
+	option allow ALL
+
+#config target 2
+#	option name 'iqn.2012-06.org.openwrt:t2'
+#	option allow 192.168.1.0/24
+
+
+# all options are set to default, except for the device
+# for all type and bstype values see tgtd(8)
+# lun "name" is constructed as TGTID_LUN
+#config lun                        1_1
+#	option readonly 0
+#	option device /dev/sda
+#	option type disk
+#	option bstype rdwr
+#	option sync 0
+#	option direct 0
+
+
+#config lun 2_1
+#	option readonly 0
+#	option device /mnt/iscsi.img
+
+#config lun 2_2
+#	option device /dev/sdc
+
+#config account
+#	option target 1
+#	option user "username1"
+#	option password "pass1"
+
+#config account
+#	option target 2
+#	option user "user2"
+#	option password "pwd2"
+#	option outgoing 1

net/tgt/files/etc/init.d/tgt

@@ -0,0 +1,107 @@
+#!/bin/sh /etc/rc.common
+START=91
+STOP=10
+
+EXTRA_COMMANDS="show"
+EXTRA_HELP="	show	Show current configuration of tgtd"
+
+NAME=tgt
+PROG=/usr/sbin/tgtd
+USE_PROCD=1
+
+tgtadm="/usr/sbin/tgtadm --lld iscsi"
+
+handle_lun() {
+	local tgt_lun=$1
+	local tgtid=$2
+	local ro device type bstype sync direct
+	local my_tgtid=${tgt_lun%_*}
+	local lun=${tgt_lun#*_}
+	[ $my_tgtid -eq $tgtid ] || return 0
+
+	config_get device $1 device ""
+	[ "$device" ] || return 1
+
+	config_get type $1 type disk
+	config_get bstype $1 bstype rdwr
+	config_get_bool readonly $1 readonly 0
+	config_get_bool sync $1 sync 0
+	config_get_bool direct $1 direct 0
+	if [ $sync -ne 0 -o $direct -ne 0 ]; then
+		local bsoflags
+		[ $sync -ne 0 ] && bsoflags="sync"
+		[ $direct -ne 0 ] && bsoflags="direct"
+		[ $sync -ne 0 -a $direct -ne 0 ] && bsoflags="sync:direct"
+		bsoflags="--bsoflags $bsoflags"
+	fi
+
+	local _tgtadm="$tgtadm --mode logicalunit --tid $tgtid --lun $lun"
+	$_tgtadm --op new --backing-store $device --device-type $type --bstype $bstype --bstype $bstype $bsoflags || return 1
+	$_tgtadm --op update --param readonly=$readonly || return 1
+}
+
+handle_account() {
+	local tgtid=$2
+	local _tgtadm="$tgtadm --mode account"
+	local target user password outgoing
+
+	config_get target $1 target ""
+	[ "$target" ] || return 1
+	[ $target -eq $tgtid ] || return 0
+
+	config_get user $1 user ""
+	[ "$user" ] || return 1
+
+	config_get password $1 password ""
+	config_get_bool outgoing $1 outgoing 0
+	[ "$outgoing" -ne 0 ] && outgoing=--outgoing || outgoing=""
+
+	$_tgtadm --op new --user "$user" --password "$password" || return 1
+	$_tgtadm --op bind --tid $tgtid --user "$user" $outgoing || return 1
+}
+
+handle_target() {
+	local tgtid=$1
+	local tgtname allow
+	local _tgtadm="$tgtadm --mode target"
+
+	[ $tgtid -ge 0 ] || return 1
+
+	config_get tgtname $1 name iqn.2012-06.org.openwrt
+	config_get allow $1 allow ALL
+
+	$_tgtadm --op new --tid $tgtid --targetname $tgtname || return 1
+	$_tgtadm --op bind --tid $tgtid -I $allow || return 1
+
+	config_foreach handle_lun lun $tgtid || return 1
+	config_foreach handle_account account $tgtid || return 1
+}
+
+configure() {
+	config_load $NAME
+	$tgtadm --mode sys --op update --name State -v offline || return 1
+	config_foreach handle_target target || return 1
+	$tgtadm --mode sys --op update --name State -v ready || return 1
+	return 0
+}
+
+start_service() {
+	procd_open_instance
+	procd_set_param command $PROG -f
+	procd_set_param respawn
+	procd_close_instance
+	logger -t $NAME -s "Configuration will be loaded in seconds"
+	( sleep 5; configure || { stop_service; exit 1; } ) &
+}
+
+stop_service() {
+	$tgtadm --mode sys --op update --name State -v offline
+	$tgtadm --mode target  --op show \
+		| awk  '$1 == "Target" {sub(/:/,"",$2); print $2}' \
+		| xargs -n1 $tgtadm --mode target --op delete --force --tid
+	$tgtadm --mode sys --op delete
+}
+
+show() {
+	$tgtadm --mode target --op show
+}