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#!/sbin/runscript
#
# Copyright (C) 2008 Mark Buechler <mark.buechler@gmail.com>
# Copyright (C) 2009-2011 Bart Van Assche <bvanassche@acm.org>
# This software is made available under the GPLv2 license.
#
# System startup script for SCST.
#
# See also:
# * http://refspecs.freestandards.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
# * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
#
SCST_CFG=/etc/scst.conf
if [ ! -e /lib/lsb/init-functions ]; then
# Slackware and Gentoo.
rc_status() {
_rc_status_ret=$?
for i; do
case "$i" in
-v)
case "${_rc_status_ret}" in
0) echo "OK";;
*) echo "Not running";;
esac
;;
esac
done
return ${_rc_status_ret}
}
start_daemon() {
"$@" >/dev/null 2>&1 &
}
killproc() {
local exe="`basename "$1"`"
killall $exe
rm -f "/var/run/$exe.pid"
}
fi
# Whether or not there is a "TARGET_DRIVER iscsi" section in scst.conf.
using_iscsi() {
for m in $SCST_MODULES; do
if [ $m = "iscsi_scst" ]; then
return 0
fi
done
return 1
}
# Parse scst.conf and assign the list of associated kernel modules to
# SCST_MODULES.
parse_scst_conf() {
SCST_MODULES="scst"
SCST_OPT_MODULES=""
SCST_DAEMONS=""
if [ ! -e $SCST_CFG ]; then
return 0
fi
local nonblanks="[^ ]\{1,\}"
local blanks="[ ]\{1,\}"
SCST_MODULES="$SCST_MODULES `sed -n -e 's/^HANDLER'"$blanks"'\('"$nonblanks"'\)'"$blanks"'{$/\1/p' \
-e 's/^\[HANDLER'"$blanks"'\('"$nonblanks"'\)\]$/\1/p' $SCST_CFG \
| while read h; do
case "$h" in
dev_cdrom) echo scst_cdrom;;
dev_changer) echo scst_changer;;
dev_disk*) echo scst_disk;;
dev_modisk*) echo scst_modisk;;
dev_processor) echo scst_processor;;
dev_raid) echo scst_raid;;
dev_tape*) echo scst_tape;;
dev_user) echo scst_user;;
vdisk*|vcdrom) echo scst_vdisk;;
*) echo "$h";;
esac
done | sort -u` \
`sed -n 's/^TARGET_DRIVER'"$blanks"'\('"$nonblanks"'\)'"$blanks"'{$/\1/p' $SCST_CFG | while read d; do
case "$d" in
iscsi) echo iscsi_scst;;
qla2x00t) echo qla2x00tgt;;
*) echo "$d";;
esac
done | sort -u` \
$SCST_TARGET_MODULES"
if using_iscsi; then
case "`uname -m`" in
x86_64|i686)
SCST_OPT_MODULES="crc32c-intel $SCST_OPT_MODULES";;
esac
SCST_OPT_MODULES="crc32c $SCST_OPT_MODULES"
SCST_DAEMONS="/usr/local/sbin/iscsi-scstd $SCST_DAEMONS"
fi
}
# Unload SCST. parse_scst_conf must already have been invoked.
unload_scst() {
for d in $SCST_DAEMONS; do
killproc $d
done
reverse_list=""
for m in $SCST_MODULES; do
reverse_list="$m $reverse_list"
done
for m in $reverse_list; do
refcnt="`cat /sys/module/$m/refcnt 2>/dev/null`"
if [ ! -z "$refcnt" ] && [ "$refcnt" -gt 0 ]; then
# Apparently it can happen that the iscsi_scst refcnt is only
# decremented a short time after killproc finished. If that
# occurs, sleep for a short time.
sleep 1
fi
if [ -e /sys/module/$m/refcnt ] && ! rmmod $m; then
return 1
fi
done
for m in $SCST_OPT_MODULES; do
reverse_list="$m $reverse_list"
done
for m in $reverse_list; do
rmmod $m >/dev/null 2>&1
done
# Clear the config in case unloading failed or SCST has been built into the
# kernel
if [ -e /sys/module/scst ]; then
scstadmin -noprompt -force -clear_config >/dev/null 2>&1
fi
return 0
}
start_scst() {
if [ -e /sys/module/scst -a -e /sys/module/scst/refcnt ]; then
echo Already started
return 1
fi
parse_scst_conf
for m in $SCST_OPT_MODULES; do
modprobe $m >/dev/null 2>&1
done
for m in $SCST_MODULES; do
if [ ! -e /sys/module/$m ]; then
if ! modprobe $m; then
echo modprobe $m failed.
unload_scst
return 5
fi
fi
done
for d in $SCST_DAEMONS; do
options=""
if [ "$(basename "$d")" = "iscsi-scstd" ]; then
options="${ISCSID_OPTIONS}"
fi
if ! start_daemon $d $options; then
echo "Starting $d failed"
unload_scst
return 1
fi
done
if [ -f $SCST_CFG ]; then
scstadmin -force -noprompt -clear_config >/dev/null 2>&1
tmpout=/tmp/scstadmin-output-$$
if scstadmin -config $SCST_CFG >$tmpout 2>&1; then
rm -f $tmpout
return 0
else
cat $tmpout
rm -f $tmpout
unload_scst
return 1
fi
else
echo "SCST configuration file $SCST_CFG missing"
return 0
fi
}
stop_scst() {
if ! parse_scst_conf; then
return 1
fi
unload_scst
}
scst_status() {
# Status has a slightly different meaning for the status command:
# 0 - service running
# 1 - service dead, but /var/run/ pid file exists
# 2 - service dead, but /var/lock/ lock file exists
# 3 - service not running
parse_scst_conf
for m in $SCST_MODULES; do
if [ ! -e /sys/module/$m ]; then
echo "$m: not loaded"
return 3
fi
done
return 0
}
depend() {
need localmount
need net
}
checkconfig() {
true
}
start() {
ebegin "Starting SCST"
start_scst
eend $?
}
stop() {
ebegin "Stopping SCST"
stop_scst
eend $?
}
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