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1bcfcd3253
Now that we know that the system uses s390x IPL and the current re-IPL
target is from FCP, whenever we get a udev event that indicates a path
state changed, we have to figure out whether it affects the path that is
currently set as re-IPL target, or goes to the same volume (so we might
use it as alternative re-IPL path).
Add a new helper `chreipl-fcp-mpath-is-ipl-tgt` for this task.
Based on the information provided in
/sys/firmware/reipl/fcp/{device,wwpn,lun} it figures out whether the
current event subject has the same triplet <Dev-Bus-ID>:<WWPN>:<LUN> (in
T10 SCSI: I_T_L nexus), or whether one of its parts (in case of
dm-multipath) has.
If true, we know for sure, that we deal with an event affecting the
current re-IPL setting, and continue.
When accessing the re-IPL firmware information a lock is taken via the
`flock` utility (from util-linux). This is done so concurrent changes
from the toolset, that are added in a later commit, don't result in
inconsistent reads.
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
57 lines
1.6 KiB
Bash
57 lines
1.6 KiB
Bash
#!/bin/bash
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# SPDX-License-Identifier: MIT
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#
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# chreipl-fcp-mpath: use multipath information to change FCP IPL target
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# (C) Copyright IBM Corp. 2021
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#
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# Uses the following system-utilities (and shell-builtins):
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# Those necessary for sourced library:
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# - chreipl-fcp-mpath-common.sh
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# Find out whether the device in udev event environment variable ${DEVPATH}
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# represents the device we want to re-IPL from. We do this by comparing
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# Device-Bus-ID/Target-WWPN/LUN of the individual SDEVs to the parameters set
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# in `/sys/firmware/reipl/fcp/`.
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#
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# Makes use of udev event environment variables:
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# DM_UUID
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# SUBSYSTEM
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# DEVPATH
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# shellcheck disable=SC2034
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declare -gr debug_trace_tag=05iilt
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# shellcheck disable=SC1091
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source '@chreiplzfcpmp-lib@' || exit 127
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firmware_get_ipl_information || exit 1
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if [[ "${DM_UUID}" == mpath-* ]]; then
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# Assume Multipath Device Mapper Device;
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# e.g.: DEVPATH = /devices/virtual/block/dm-0
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declare sdev
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# depends on `nullglob` from `chreipl-fcp-mpath-common.sh`
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for sdev in /sys/"${DEVPATH}"/slaves/sd*/device; do
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sdev_get_fcp_addressing "${sdev}" || continue
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[ "${SDEV_LUN}" = "${IPL_LUN}" ] || continue
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[ "${SDEV_WWPN}" = "${IPL_WWPN}" ] || continue
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[ "${SDEV_BUSID}" = "${IPL_BUSID}" ] || continue
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exit 0
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done
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unset sdev
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elif [ "${SUBSYSTEM}" = block ]; then
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# Assume SCSI Disk;
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# e.g.: DEVPATH = /devices/css0/0.0.0014/0.0.1700/host0/rport-0:0-0/target0:0:0/0:0:0:1074806808/block/sds
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sdev_get_fcp_addressing /sys/"${DEVPATH}"/device || exit 2
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[ "${SDEV_LUN}" = "${IPL_LUN}" ] || exit 3
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[ "${SDEV_WWPN}" = "${IPL_WWPN}" ] || exit 4
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[ "${SDEV_BUSID}" = "${IPL_BUSID}" ] || exit 5
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exit 0
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fi
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exit 6
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