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ed106d7f28
The existing code can already determine the required devices for the
actively running system, but this does not work for execution environments
in different (disaster recovery) sites.
Kdump likely does not notice when running in a different site and does not
re-generate the kdump initrd (because the kdump config itself does not
change).
The new code allows users to explicitly specify devices required for early
boot in initrd on different sites. Assuming this is a small number of
devices and could even overlap between the root-fs and the kdump case, do
not further distinguish those two sets of devices, but simply use the same
marker attribute "zdev:early=1" for both cases. With all this site
information available at the (initial) kdump initrd generation, the
resulting kdump initrd can work on any site without having to re-generate.
Complements commit 3c7adcc3c81d ("zdev: dracut: modifiy the
module-setup.sh").
Github-ID: https://github.com/ibm-s390-linux/s390-tools/pull/158
Reviewed-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
131 lines
4.2 KiB
Bash
Executable File
131 lines
4.2 KiB
Bash
Executable File
#!/bin/bash
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#
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# Copyright IBM Corp. 2023
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#
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# s390-tools is free software; you can redistribute it and/or modify
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# it under the terms of the MIT license. See LICENSE for details.
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#
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#
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# 95zdev-kdump/module_setup.sh
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# This module installs configuration files (udev rules and modprobe.conf
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# files) required to enable the kdump target on s390.
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#
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# called by dracut
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check() {
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local _arch=${DRACUT_ARCH:-$(uname -m)}
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# Ensure that we're running on s390
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[ "$_arch" = "s390" ] || [ "$_arch" = "s390x" ] || return 1
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# shellcheck source=/dev/null
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source "${moddir:?}/../95zdev/zdev-lib.sh"
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# Ensure this module is only included when building kdump initrd
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zdev_is_kdump || return 1
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# Ensure that required tools are available
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require_binaries chzdev lszdev || return 1
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return 0
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}
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# called by dracut
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depends() {
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return 0
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}
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# called by dracut
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installkernel() {
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# Add modules for all device types supported by chzdev (required for
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# auto-configuration)
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instmods ctcm lcs qeth qeth_l2 qeth_l3 dasd_mod dasd_eckd_mod dasd_fba_mod \
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dasd_diag_mod zfcp
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}
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# called by dracut
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install() {
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local _tempfile
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# zdev_id is not functionally required for kdump but optionally
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# installing avoids error messages from zdev site udev rule processing
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inst_multiple -o /lib/s390-tools/zdev_id
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# Obtain kdump target device configuration
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_tempfile=$(mktemp --tmpdir dracut-zdev.XXXXXX)
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# work with systems that are not based on chzdev persistent config
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local _configuration="--active"
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# disable zfcp auto LUN scan to prevent OOM situations on systems with
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# many zFCP LUNs
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inst_dir /etc/modprobe.d
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chzdev zfcp --type "allow_lun_scan=0" --persistent \
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--base "/etc=${initdir:?}/etc" --yes --no-root-update \
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--force 2>&1 | ddebug
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# drop /etc/zfcp.conf from dracut module 95zfcp
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echo "rd.zfcp.conf=0" > "$initdir/etc/cmdline.d/00-no-zfcp-conf.conf"
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# => only activate individual zfcp paths found as required below
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function check_zdev() {
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local _dev=$1
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local _devsysfs _bdevpath
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_devsysfs=$(
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cd -P /sys/dev/block/"$_dev" && echo "$PWD"
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)
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_bdevpath=/dev/${_devsysfs##*/}
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# do not export device type information potentially unknown on import
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chzdev --export - "$_configuration" --by-node "$_bdevpath" --quiet \
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2>/dev/null >> "$_tempfile"
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}
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for_each_host_dev_and_slaves_all check_zdev
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sed -i -e 's/^\[active /\[persistent /' "$_tempfile"
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# in addition to active devices above, also add persistent config
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# of devices the user marked for early initrd use
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chzdev --export - --persistent --by-attrib "zdev:early=1" --quiet \
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--type 2>/dev/null >> "$_tempfile"
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# site support
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# Obtain early device configuration for site-specific settings
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for (( site=0; site<10; site++ ))
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do
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chzdev --export - --persistent --by-attrib "zdev:early=1" --site $site \
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--quiet 2>/dev/null >> "$_tempfile"
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done
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ddebug < "$_tempfile"
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# Apply via --import to prevent other devices from being configured
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chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
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--yes --no-root-update --force 2>&1 | ddebug
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# Apply site-specific configurations via --import
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for (( site=0; site<10; site++ ))
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do
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chzdev --import "$_tempfile" --persistent --base "/etc=$initdir/etc" \
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--site $site --yes --no-root-update --force 2>&1 | ddebug
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done
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lszdev --configured --persistent --info \
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--base "/etc=$initdir/etc" 2>&1 | ddebug
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rm -f "$_tempfile"
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# these are purely generated udev rules so we have to glob expand
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# within $initdir and strip the $initdir prefix for mark_hostonly
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local -a _array
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# shellcheck disable=SC2155
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local _nullglob=$(shopt -p nullglob)
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shopt -u nullglob
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readarray -t _array < \
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<(ls -1 "$initdir"/etc/udev/rules.d/41-*.rules 2> /dev/null)
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[[ ${#_array[@]} -gt 0 ]] && mark_hostonly "${_array[@]#$initdir}"
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readarray -t _array < \
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<(ls -1 "$initdir"/etc/modprobe.d/s390x-*.conf 2> /dev/null)
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[[ ${#_array[@]} -gt 0 ]] && mark_hostonly "${_array[@]#$initdir}"
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$_nullglob
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return 0
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}
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