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d558b3ad7e
Port the old pvscan -aay scanning optimization to vgchange -aay. The optimization uses pvs_online files created by pvscan --cache to derive a list of devices to use when activating a VG. This allows autoactivation of a VG to avoid scanning all devices, and only scan the devices used by the VG itself. The optimization is applied internally using the device hints interface. The new option "--autoactivation event" is given to pvscan and vgchange commands that are called by event activation. This informs the command that it is being used for event activation, so that it can apply checks and optimizations that are specific to event activation. Those include: - skipping the command if lvm.conf event_activation=0 - checking that a VG is complete before activating it - using pvs_online files to limit device scanning
88 lines
3.3 KiB
Plaintext
88 lines
3.3 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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ENV{LVM_MD_PV_ACTIVATED}!="1", ENV{SYSTEMD_READY}="0"
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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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ENV{LVM_LOOP_PV_ACTIVATED}!="1", ENV{SYSTEMD_READY}="0"
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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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ENV{SYSTEMD_READY}="1"
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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 $env{DEVNAME}"
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ENV{LVM_VG_NAME_COMPLETE}=="?*", RUN+="/usr/bin/systemd-run -r --no-block --property DefaultDependencies=no --unit lvm-activate-$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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