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e7c8a82506
Since 67722b3123, we have a new mechanism
to run the autoactivation from udev. With this change, we also replaced
the way the LVM autoactivation service is instantiatiated - instead of
setting the SYSTEM_WANTS udev variable (which systemd read and then
instantiated the service), we're now directly instantiating the
transient 'lvm-activate-<vgname>' service by calling systemd-run.
As such, we don't need to bother with setting the SYSTEMD_READY variable
for foreign devices anymore (in this case, MD and loop devices on top of
which there's a PV).
Before, we set the SYSTEMD_READY variable to make sure that the SYSTEMD_WANTS
is applied correctly - the service instantiation was edge-triggered by
flipping the SYSTEMD_READY from 0 to 1 and at the same time having the
SYSTEMD_WANTS variable set to the service name to instantiate. We're
using systemd-run now so this condition does not apply anymore.
Also, it was not completely correct to set SYSTEMD_READY for foreign
devices because there might be cases where this could cause issues,
see also https://github.com/lvmteam/lvm2/issues/94.
84 lines
3.2 KiB
Plaintext
84 lines
3.2 KiB
Plaintext
# Copyright (C) 2012,2021 Red Hat, Inc. All rights reserved.
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#
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# This file is part of LVM.
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#
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# This rule requires blkid to be called on block devices before so only devices
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# used as LVM PVs are processed (ID_FS_TYPE="LVM2_member").
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SUBSYSTEM!="block", GOTO="lvm_end"
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(LVM_EXEC_RULE)
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ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", GOTO="lvm_end"
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# Only process devices already marked as a PV - this requires blkid to be called before.
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ENV{ID_FS_TYPE}!="LVM2_member", GOTO="lvm_end"
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ENV{DM_MULTIPATH_DEVICE_PATH}=="1", GOTO="lvm_end"
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ACTION=="remove", GOTO="lvm_end"
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# Create /dev/disk/by-id/lvm-pv-uuid-<PV_UUID> symlink for each PV
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ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-id/lvm-pv-uuid-$env{ID_FS_UUID_ENC}"
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# If the PV is a special device listed below, scan only if the device is
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# properly activated. These devices are not usable after an ADD event,
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# but they require an extra setup and they are ready after a CHANGE event.
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# Also support coldplugging with ADD event but only if the device is already
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# properly activated.
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# This logic should be eventually moved to rules where those particular
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# devices are processed primarily (MD and loop).
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# DM device:
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KERNEL!="dm-[0-9]*", GOTO="next"
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ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", ENV{DM_ACTIVATION}=="1", GOTO="lvm_scan"
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GOTO="lvm_end"
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# MD device:
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LABEL="next"
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KERNEL!="md[0-9]*", GOTO="next"
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IMPORT{db}="LVM_MD_PV_ACTIVATED"
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ACTION=="add", ENV{LVM_MD_PV_ACTIVATED}=="1", GOTO="lvm_scan"
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ACTION=="change", ENV{LVM_MD_PV_ACTIVATED}!="1", TEST=="md/array_state", ENV{LVM_MD_PV_ACTIVATED}="1", GOTO="lvm_scan"
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ACTION=="add", KERNEL=="md[0-9]*p[0-9]*", GOTO="lvm_scan"
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GOTO="lvm_end"
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# Loop device:
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LABEL="next"
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KERNEL!="loop[0-9]*", GOTO="next"
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ACTION=="add", ENV{LVM_LOOP_PV_ACTIVATED}=="1", GOTO="lvm_scan"
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ACTION=="change", ENV{LVM_LOOP_PV_ACTIVATED}!="1", TEST=="loop/backing_file", ENV{LVM_LOOP_PV_ACTIVATED}="1", GOTO="lvm_scan"
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GOTO="lvm_end"
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LABEL="next"
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ACTION!="add", GOTO="lvm_end"
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LABEL="lvm_scan"
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# pvscan will check if this device completes a VG,
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# i.e. all PVs in the VG are now present with the
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# arrival of this PV. If so, it prints to stdout:
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# LVM_VG_NAME_COMPLETE='foo'
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#
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# When the VG is complete it can be activated, so
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# vgchange -aay <vgname> is run. It is run via
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# systemd since it can take longer to run than
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# udev wants to block when processing rules.
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# (if there are hundreds of LVs to activate,
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# the vgchange can take many seconds.)
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#
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# pvscan only reads the single device specified,
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# and uses temp files under /run/lvm to check if
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# other PVs in the VG are present.
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#
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# If event_activation=0 in lvm.conf, this pvscan
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# (using checkcomplete) will do nothing, so that
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# no event-based autoactivation will be happen.
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#
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# TODO: adjust the output of vgchange -aay so that
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# it's better suited to appearing in the journal.
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IMPORT{program}="(LVM_EXEC)/lvm pvscan --cache --listvg --checkcomplete --vgonline --autoactivation event --udevoutput --journal=output $env{DEVNAME}"
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ENV{LVM_VG_NAME_COMPLETE}=="?*", RUN+="/usr/bin/systemd-run --no-block --property DefaultDependencies=no --unit lvm-activate-$env{LVM_VG_NAME_COMPLETE} (LVM_EXEC)/lvm vgchange -aay --autoactivation event $env{LVM_VG_NAME_COMPLETE}"
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GOTO="lvm_end"
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LABEL="lvm_end"
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