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https://github.com/ibm-s390-linux/s390-tools.git
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06a30ae529
Add parsing of dracut cmdline option "rd.zfcp=..." at initrd runtime. It delegates configuration to chzdev. Implement `dracut --print-cmdline` and `dracut --hostonly-cmdline` for initrd build time. Emit an rd.zfcp option for each zfcp-attached SCSI disk in dracut's device dependency graph (to mount the root-fs, or to access the kdump target). This allows a distribution independent device configuration. Configuration is consistent by using chzdev as backend. It also prevents duplicate activations of the same device. Along with the existing functionality of zdev/dracut, it makes the following dracut modules superfluous: https://github.com/dracutdevs/dracut/tree/master/modules.d/95zfcp [rd.zfcp.conf is no longer needed and thus ignored here; the preceding ("zdev/dracut: fix marking hostonly files so delete option works") makes rd.hostonly=0 work as a generic replacement] https://github.com/dracutdevs/dracut/tree/master/modules.d/95zfcp_rules Github-ID: https://github.com/ibm-s390-linux/s390-tools/pull/158 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>
103 lines
3.9 KiB
Bash
103 lines
3.9 KiB
Bash
#
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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/zdev-lib.sh
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# Common shell library functionality for 95zdev and 95zdev-kdump.
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#
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# shellcheck shell=bash
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zdev_is_kdump() {
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# https://src.fedoraproject.org/rpms/kexec-tools/c/4eedcae5e1540690a3761857fe2e692774c44960
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# https://src.fedoraproject.org/rpms/kexec-tools/blob/rawhide/f/mkdumprd
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# https://src.fedoraproject.org/rpms/kexec-tools/blob/rawhide/f/dracut-module-setup.sh
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# shellcheck disable=SC2154
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if [[ $hostonly && "$hostonly_mode" == "strict" && -n "$IN_KDUMP" ]]; then
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return 0
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fi
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# https://github.com/openSUSE/kdump/blob/master/dracut/module-setup.sh
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# shellcheck disable=SC2154
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if [[ " $dracutmodules $add_dracutmodules $force_add_dracutmodules " == *\ kdump\ * ]]; then
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return 0
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fi
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return 1
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}
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zdev_zfcp_auto_lun_scan_active() {
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local _fcpdevsysfs=$1
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local _porttype _lunscan
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read -r _porttype < "$_fcpdevsysfs"/host*/fc_host/host*/port_type
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read -r _lunscan < /sys/module/zfcp/parameters/allow_lun_scan
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if [[ "$_porttype" == "NPIV VPORT" && "$_lunscan" == "Y" ]]; then
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return 0
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fi
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return 1
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}
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# zdev_check_dev() can be extended for other device types such as DASD or PCIe
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zdev_check_dev() {
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local _dev=$1
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local _devsysfs _devtype _subsystem _driver
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local _intlun _fcplun _scsitarget _wwpn _hbaid
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_devsysfs=$(
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cd -P /sys/dev/block/"$_dev" 2> /dev/null && echo "$PWD"
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)
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# This is roughly what systemd's udev-builtin-path_id does for zfcp:
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while [[ -n "$_devsysfs" ]]; do
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# ascend to parent: strip last path part
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_devsysfs=${_devsysfs%/*}
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_subsystem=$(
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cd -P "$_devsysfs"/subsystem 2> /dev/null && echo "$PWD"
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)
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if [[ "${_subsystem##*/}" == "scsi" ]]; then
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_devtype=$(grep "^DEVTYPE=" "$_devsysfs"/uevent)
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# check for FCP LUN
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if [[ "$_devtype" == "DEVTYPE=scsi_device" ]]; then
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_intlun=${_devsysfs##*:}
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# convert _intlun to _fcplun [int_to_scsilun()]
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_fcplun=0
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((_fcplun |= (_intlun & 0x000000000000ffff) << 48))
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((_fcplun |= (_intlun & 0x00000000ffff0000) << 16))
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((_fcplun |= (_intlun & 0x0000ffff00000000) >> 16))
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((_fcplun |= (_intlun & 0xffff000000000000) >> 48))
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printf -v _fcplun "0x%016x" "$_fcplun"
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# bail out if not scsi_transport_fc
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[[ "${_devsysfs/*rport-*/FOUND}" == "FOUND" ]] || return 0
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continue
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fi
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# check for target WWPN
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if [[ "$_devtype" == "DEVTYPE=scsi_target" ]]; then
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_scsitarget=${_devsysfs##*/}
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read -r _wwpn < "$_devsysfs/fc_transport/$_scsitarget/port_name"
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continue
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fi
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fi
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if [[ "${_subsystem##*/}" == "ccw" ]]; then
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_driver=$(
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cd -P "$_devsysfs"/driver 2> /dev/null && echo "$PWD"
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)
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# check for FCP device (vHBA) bus-ID
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if [[ "${_driver##*/}" == "zfcp" ]]; then
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_hbaid=${_devsysfs##*/}
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# drop full path and use zfcp auto LUN scan, if:
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# - not building for kdump which has zfcp auto LUN scan off
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# - and zfcp auto LUN scan is available
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if ! zdev_is_kdump && \
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zdev_zfcp_auto_lun_scan_active "$_devsysfs"; then
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unset _wwpn
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unset _fcplun
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fi
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if [[ -n "$_wwpn" ]] && [[ -n "$_fcplun" ]]; then
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printf " rd.zfcp=%s,%s,%s\n" "$_hbaid" "$_wwpn" "$_fcplun"
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else
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printf " rd.zfcp=%s\n" "$_hbaid"
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fi
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break
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fi
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fi
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done
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}
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