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#!/bin/bash
#
# Copyright IBM Corp. 2023
#
# s390-tools is free software; you can redistribute it and/or modify
# it under the terms of the MIT license. See LICENSE for details.
#
#
# 95zdev-kdump/module_setup.sh
# This module installs configuration files (udev rules and modprobe.conf
# files) required to enable the kdump target on s390. In addition,
# hooks are installed to parse rd.zfcp= and rd.dasd= kernel parameters.
#
# called by dracut
check() {
local _arch=${DRACUT_ARCH:-$(uname -m)}
# Ensure that we're running on s390
[ "$_arch" = "s390" ] || [ "$_arch" = "s390x" ] || return 1
# shellcheck source=/dev/null
source "${moddir:?}/../95zdev/zdev-lib.sh"
# Ensure this module is only included when building kdump initrd
zdev_is_kdump || return 1
# Ensure that required tools are available
require_binaries chzdev lszdev || return 1
require_binaries sed || return 1
require_binaries grep sort uniq || return 1
return 0
}
# called by dracut
depends() {
return 0
}
# called by dracut and (conditionally) locally by install()
# Generate rd.zfcp dracut cmdline options for each zfcp-attached
# SCSI disk in dracut's device dependency graph (to mount the root-fs,
# or to access the kdump target). With "dracut --print-cmdline", dracut
# prints the list. With "dracut --hostonly-cmdline", dracut stores the
# list inside the generated initrd.
cmdline() {
# shellcheck disable=SC2154
if [[ $hostonly ]]; then
for_each_host_dev_and_slaves_all zdev_check_dev | sort | uniq
fi
}
# called by dracut
installkernel() {
# Add modules for all device types supported by chzdev (required for
# auto-configuration)
instmods ctcm lcs qeth qeth_l2 qeth_l3 dasd_mod dasd_eckd_mod dasd_fba_mod \
dasd_diag_mod zfcp
}
# called by dracut
install() {
local _tempfile
# zdev_id is not functionally required for kdump but optionally
# installing avoids error messages from zdev site udev rule processing
inst_multiple -o /lib/s390-tools/zdev_id
# Ensure that required tools are available
inst_multiple chzdev grep
# Hook to parse zfcp dracut cmdline parameter
inst_hook cmdline 95 "$moddir/../95zdev/parse-zfcp.sh"
# Hook to parse dasd dracut cmdline parameter
# Must be the first one to use chzdev so dasd_mod is not yet loaded.
inst_hook cmdline 94 "$moddir/../95zdev/parse-dasd.sh"
inst_multiple /lib/s390-tools/zdev-from-dasd_mod.dasd
inst_rules "59-dasd.rules"
# Obtain kdump target device configuration
# shellcheck disable=SC2154
if [[ $hostonly_cmdline == "yes" ]]; then
local _rdsomedev
for _rdsomedev in $(cmdline); do
printf "%s\n" "$_rdsomedev" >> "${initdir:?}/etc/cmdline.d/94zdev.conf"
done
fi
_tempfile=$(mktemp --tmpdir="${DRACUT_TMPDIR}" dracut-zdev.XXXXXX)
# work with systems that are not based on chzdev persistent config
local _configuration="--active"
# disable zfcp auto LUN scan to prevent OOM situations on systems with
# many zFCP LUNs
inst_dir /etc/modprobe.d
chzdev zfcp --type "allow_lun_scan=0" --persistent \
--base "/etc=${initdir:?}/etc" --yes --no-root-update \
--force 2>&1 | ddebug
# drop /etc/zfcp.conf from dracut module 95zfcp
echo "rd.zfcp.conf=0" > "$initdir/etc/cmdline.d/00-no-zfcp-conf.conf"
# => only activate individual zfcp paths found as required below
function check_zdev() {
local _dev=$1
local _devsysfs _bdevpath
_devsysfs=$(
cd -P /sys/dev/block/"$_dev" && echo "$PWD"
)
_bdevpath=/dev/${_devsysfs##*/}
# do not export device type information potentially unknown on import
chzdev --export - "$_configuration" --by-node "$_bdevpath" --quiet \
2>/dev/null >> "$_tempfile"
}
for_each_host_dev_and_slaves_all check_zdev
sed -i -e 's/^\[active /\[persistent /' "$_tempfile"
# in addition to active devices above, also add persistent config
# of devices the user marked for early initrd use
chzdev --export - --persistent --by-attrib "zdev:early=1" --quiet \
--type 2>/dev/null >> "$_tempfile"
# site support
# Obtain early device configuration for site-specific settings
for (( site=0; site<10; site++ ))
do
chzdev --export - --persistent --by-attrib "zdev:early=1" --site $site \
--quiet 2>/dev/null >> "$_tempfile"
done
ddebug < "$_tempfile"
# Apply via --import to prevent other devices from being configured
chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
--yes --no-root-update --force 2>&1 | ddebug
# Apply site-specific configurations via --import
for (( site=0; site<10; site++ ))
do
chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
--site $site --yes --no-root-update --force 2>&1 | ddebug
done
lszdev --configured --persistent --info \
--base "/etc=$initdir/etc" 2>&1 | ddebug
rm -f "$_tempfile"
# these are purely generated udev rules so we have to glob expand
# within $initdir and strip the $initdir prefix for mark_hostonly
local -a _array
# shellcheck disable=SC2155
local _nullglob=$(shopt -p nullglob)
shopt -u nullglob
readarray -t _array < \
<(ls -1 "$initdir"/etc/udev/rules.d/41-*.rules 2> /dev/null)
[[ ${#_array[@]} -gt 0 ]] && mark_hostonly "${_array[@]#$initdir}"
readarray -t _array < \
<(ls -1 "$initdir"/etc/modprobe.d/s390x-*.conf 2> /dev/null)
[[ ${#_array[@]} -gt 0 ]] && mark_hostonly "${_array[@]#$initdir}"
$_nullglob
return 0
}
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