#!/bin/sh
#
# dasd_reload
# $Id: dasd_reload,v 1.2 2004/05/26 15:17:09 hare Exp $
#
# Deconfigures all active DASDs, unloads the modules
# and activates the configured DASDs again.
# Needed to establish an identical device mapping
# in the installation system and in the running system.
# All DASD access need to be cancelled prior to running
# this script.
#
# Usage:
#    dasd_reload
#
# Return values:
#   1  Cannot read /proc/modules
#   2  Missing module programs
#   3  /sys not mounted
#   4  Failure on deactivate DASDs
#

if [ ! -r /proc/modules ]; then
    echo "Cannot read /proc/modules"
    exit 1
fi

if [ ! -x /sbin/rmmod -o ! -x /sbin/modprobe ]; then
    echo "Missing module programs"
    exit 2
fi

if [ ! -d /sys/bus ]; then
    echo "sysfs not mounted"
    exit 3
fi

let anymd=0
if [ -f /proc/mdstat ]; then
    for mddevice in $(grep active /proc/mdstat  | cut -f1 -d:); do
	mdadm -S /dev/${mddevice}
	let anymd=1
    done
    udevadm settle
fi

#
#	Setting HyperPAV alias devices offline
#
dasd_alias=
let EXITRC=0
for dev in /sys/bus/ccw/devices/*; do
    if [ -f $dev/use_diag ]; then
	read _online < $dev/online
	read _alias  < $dev/alias
	if [ "$_online" -eq 1  -a "$_alias" -eq 1 ]; then
	    echo "setting DASD HyperPAV alias $(basename $dev) offline"
	    echo "0" > $dev/online
	    read _online < $dev/online
	    dasd_alias="$dasd_alias $(basename $dev)"
	    if [ "$_online" -eq 1 ]; then
		echo "failure on setting DASD HyperPAV alias $(basename $dev) offline !"
		let EXITRC=4
	    fi
	fi
    fi
done

#
#	Setting "normal" DASD and HyperPAV base devices offline
#
dasd_base=
for dev in /sys/bus/ccw/devices/*; do
    if [ -f $dev/use_diag ]; then
	read _online < $dev/online
	read _alias  < $dev/alias
	if [ "$_online" -eq 1  -a "$_alias" -eq 0 ]; then
	    echo "setting DASD $(basename $dev) offline"
	    echo "0" > $dev/online
	    read _online < $dev/online
	    dasd_base="$dasd_base $(basename $dev)"
	    if [ "$_online" -eq 1 ]; then
		echo "failure on setting DASD $(basename $dev) offline !"
		let EXITRC=4
	    fi
	fi
    fi
done

udevadm settle

module_list=
module_test_list="dasd_diag_mod dasd_eckd_mod dasd_fba_mod dasd_mod"
for module in $module_test_list; do
    if grep -q "$module" /proc/modules; then
	module_list="$module $module_list"
	: Unloading $module
	/sbin/rmmod $module
    fi
done

if [ -d /etc/udev/rules.d ]; then
    cd /etc/udev/rules.d
#
#	Re-activating "normal" DASD and HyperPAV base devices
#
    for dasd in $dasd_base; do
	file="51-dasd-${dasd}.rules"
	if [ -f "$file" ] ; then
	   echo Activating $dasd
	    if grep -q use_diag $file ; then
		DASD_USE_DIAG=1
	    else
		DASD_USE_DIAG=0
	    fi
	    /sbin/dasd_configure $dasd 1 $DASD_USE_DIAG
	fi
    done

#
#	Re-activating HyperPAV alias devices
#
    for dasd in $dasd_alias; do
	file="51-dasd-${dasd}.rules"
	if [ -f "$file" ] ; then
	   echo Activating $dasd
	    if grep -q use_diag $file ; then
		DASD_USE_DIAG=1
	    else
		DASD_USE_DIAG=0
	    fi
	    /sbin/dasd_configure $dasd 1 $DASD_USE_DIAG
	fi
    done
fi

exit ${EXITRC}