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2a29a28f78
When the first test, whether the current event subject represents the re-IPL target failed, we attempt a second test, using the recorded WWID of a previously successful attempt. The new helper `chreipl-fcp-mpath-is-ipl-vol` utilizes the information previously stored in the ID-file (read under lock via `flock`). The recorded WWID is compared with the one of the event subject; if it matches we know that it addresses the same volume, and might be used as alternative re-IPL target. Additionally we also compare the current re-IPL triplet with the one recorded in the ID-file. If it doesn't match anymore, we assume the recorded WWID is stale - e.g., because the operator changed the re-IPL target manually - and the previous check invalid. If both the WWID match, and the re-IPL triplet is still the same as previously recorded, the toolset may continue with the subject, and use it as replacement for the current re-IPL target. 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>
87 lines
2.5 KiB
Bash
87 lines
2.5 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 environment variable ${DEVPATH} represents the
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# _volume_ that we IPL'ed from. We do this by comparing its WWID to the one
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# recorded in `@chreiplzfcpmp-id-file@`.
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#
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# Makes use of udev event environment variables:
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# DM_UUID
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# SUBSYSTEM
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# DEVPATH
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# shellcheck disable=SC2034
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declare -gr debug_trace_tag=11iilv
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# shellcheck disable=SC1091
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source '@chreiplzfcpmp-lib@' || exit 127
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function id_file_read_ipl_information() {
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local -a records
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declare -g REC_WWID="" REC_BUSID="" REC_WWPN="" REC_LUN=""
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# lock file before reading ID, so we don't see any intermediate state
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id_file_lock_shared_no_create || return 1
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{ readarray -d "" -t -u "${ID_FILE_LOCK}" records; } 2>/dev/null \
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|| return 2
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if '@DEBUG@'; then declare -p records 1>&2; fi
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id_file_unlock_shared_no_create
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[ "${#records[@]}" = "4" ] || return 3
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# check that none of the array fields contains whitespace only
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[ "${records[0]/#*([[:space:]])}" != "" ] || return 4
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[ "${records[1]/#*([[:space:]])}" != "" ] || return 5
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[ "${records[2]/#*([[:space:]])}" != "" ] || return 6
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[ "${records[3]/#*([[:space:]])}" != "" ] || return 7
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REC_WWID="${records[0]}"
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REC_BUSID="${records[1]}"
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REC_WWPN="${records[2]}"
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REC_LUN="${records[3]}"
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return 0
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}
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id_file_read_ipl_information || exit 1
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if [[ "${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 found=false
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for sdev in /sys/"${DEVPATH}"/slaves/sd*/device; do
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if sdev_get_wwid "${sdev}"; then
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found=true
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break
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fi
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done
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unset sdev
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"${found}" || exit 2
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elif [ "${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_wwid /sys/"${DEVPATH}"/device || exit 3
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fi
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# set by `sdev_get_wwid` and `id_file_read_ipl_information`
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[ "${SDEV_WWID}" = "${REC_WWID}" ] || exit 4
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firmware_get_ipl_information || exit 5
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# set by `firmware_get_ipl_information` and `id_file_read_ipl_information`
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[ "${IPL_BUSID}" = "${REC_BUSID}" ] || exit 6
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[ "${IPL_WWPN}" = "${REC_WWPN}" ] || exit 7
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[ "${IPL_LUN}" = "${REC_LUN}" ] || exit 8
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exit 0
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