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When we have identified the current event subject to represent the re-IPL target, we record its WWID for future identification in a stateful ID-file (per default: /run/udev/chreiplzfcpmp-ipl-volume-id). In addition to the WWID, we also record the current re-IPL triplet (<Dev-Bus-ID>:<WWPN>:<LUN>), so that when that changes - e.g. due to an operator manually changing the re-IPL target -, we know that the recorded WWID is stale. This record may be used in cases when the current re-IPL target is completely gone from the system, so we can't used it as comparison object for when events arrive for paths that go to the same volume, but don't have the same I_T_L nexus. They however have the same WWID. We may use these (new) paths as replacement for the one that is completely gone. The new helper `chreipl-fcp-mpath-record-volume-identifier` uses the kernel scsi-device attribute `wwid` as source for the WWID (verbatim). As with reading the re-IPL firmware information, when writing to the ID-file, a lock is taken via `flock`, to prevent overlapping writes/reads to the file. 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>
74 lines
2.8 KiB
Plaintext
74 lines
2.8 KiB
Plaintext
# 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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# Did the event affect a multipath or scsi disk device?
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ACTION=="change", KERNEL=="dm-[0-9]*", SUBSYSTEM=="block", \
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ENV{DM_UUID}=="mpath-*", ENV{DM_ACTION}=="PATH_FAILED", \
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GOTO="chreipl_fcp_mpath_path_change"
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ACTION=="change", KERNEL=="dm-[0-9]*", SUBSYSTEM=="block", \
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ENV{DM_UUID}=="mpath-*", ENV{DM_ACTION}=="PATH_REINSTATED", \
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GOTO="chreipl_fcp_mpath_path_change"
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ACTION=="add", KERNEL=="sd[a-z]*", SUBSYSTEM=="block", \
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GOTO="chreipl_fcp_mpath_path_change"
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GOTO="chreipl_fcp_mpath_end"
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LABEL="chreipl_fcp_mpath_path_change"
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# Is this system IPL'ed (IOW, are we on s390x)? And do we ReIPL via zFCP?
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#
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# udev(7): If no absolute path is given, the program is expected to live
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# in /usr/lib/udev; otherwise, the absolute path must be
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# specified.
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TEST!="/sys/firmware/ipl", GOTO="chreipl_fcp_mpath_end"
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PROGRAM!="chreipl-fcp-mpath-is-reipl-zfcp", GOTO="chreipl_fcp_mpath_end"
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# Consider the following scenarios.
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# Either:
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#
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# (A) We recognized a new SCSI Disk. This might represent:
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# (a) the path we want to ReIPL from.
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#
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# Or:
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#
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# (B) We recognized a PATH_ event for a multipath device. This might represent:
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# the path we want to ReIPL from:
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# (a) went away;
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# (b) came back online;
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# an alternative path to the volume we want to ReIPL from:
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# (c) went away;
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# (d) came back online.
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# Test whether the affected device is, or contains, the current IPL target.
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#
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# This covers scenarios:
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# (A) (a),
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# (B) (a)/(b)/(c)/(d)
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PROGRAM!="chreipl-fcp-mpath-is-ipl-tgt", \
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ENV{CHREIPL_FCP_MPATH_IS_TGT}="false", \
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GOTO="chreipl_fcp_mpath_not_direct_match"
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ENV{CHREIPL_FCP_MPATH_IS_TGT}="true"
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# Record the WWID, Device-Bus-ID, Remote WWPN, and LUN of the ReIPL target
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# (see `chreipl-fcp-mpath-is-ipl-vol` for usecases). This information
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# might change, depending on whether the machine operator changes the ReIPL
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# target to a different volume.
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#
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# XXX: Because the kernel doesn't generate any events upon changing of
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# the ReIPL target, the chreipl-fcp-mpath toolset can't take any
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# actions until the next path event for the new target is
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# generated. Following that, we assume that when the machine
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# operator changes the ReIPL target, the new target is reachable
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# and in a good state at this point in time.
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PROGRAM!="chreipl-fcp-mpath-record-volume-identifier", \
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GOTO="chreipl_fcp_mpath_try_change_ipl_path"
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GOTO="chreipl_fcp_mpath_try_change_ipl_path"
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# If the even subject is not a direct match (not the sdev that is the current
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# ReIPL target, and not a mpath device that contains the current ReIPL target)
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LABEL="chreipl_fcp_mpath_not_direct_match"
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LABEL="chreipl_fcp_mpath_try_change_ipl_path"
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LABEL="chreipl_fcp_mpath_end"
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