#!/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 /usr/sbin/rmmod -o ! -x /usr/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}
	/usr/sbin/rmmod ${module}
    fi
done

udevadm settle
sleep 2

if [ -d /etc/udev/rules.d ]; then
    cd /etc/udev/rules.d
#
#	Re-activating "normal" DASD and HyperPAV base devices
#
#	We need to move all the DASD udev rules out from /etc/udev/rules.d
#	because if we don't, then when the first DASD volume gets brought
#	back online, they are all brought back online, in a non-deterministic
#	order, not the numeric order we expect.
#
    mv -i 41-dasd-*.rules 51-dasd-*.rules /tmp
    cd /tmp
    for dasd in ${dasd_base}; do
	for file in 41-dasd-*-${dasd}.rules 51-dasd-${dasd}.rules; do
	    [ -f "${file}" ] || continue
#
#	Special handling is needed for old udev rules that start with 51-
#	since the chzdev command won't look for that name
#
	    prefix="$(echo ${file} | cut -f1 -d-)"
	    if [ "${prefix}" == "51" ]; then
		if [ -h /sys/bus/ccw/drivers/dasd-eckd/${dasd} ]; then
		    mv -i ${file} 41-dasd-eckd-${dasd}.rules
		elif [ -h /sys/bus/ccw/drivers/dasd-fba/${dasd} ]; then
		    mv -i ${file} 41-dasd-fba-${dasd}.rules
		else echo "DASD volume ${dasd} is neither an ECKD or FBA device."
		     let EXITRC=4
		fi
	    fi
	    echo Activating ${dasd}
	    mv -i "${file}" /etc/udev/rules.d/
	    /usr/sbin/chzdev dasd --apply --configured -q --no-root-update ${dasd}
	    lsdasd
	    break
	done
    done

#
#	Re-activating HyperPAV alias devices
#
    for dasd in ${dasd_alias}; do
	for file in 41-dasd-*-${dasd}.rules 51-dasd-${dasd}.rules; do
	    [ -f "${file}" ] || continue
	    echo Activating ${dasd}
	    mv -i "${file}" /etc/udev/rules.d/
	    /usr/sbin/chzdev dasd --apply --configured -q --no-root-update ${dasd}
	    break
	done
    done
fi

exit ${EXITRC}