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new udev and systemd autoactivation

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udev rule calls pvscan directly which indicates if the
VG can be activated.  If so, the lvm-vgchange service
is run, which runs vgchange -aay.
This commit is contained in:
David Teigland 2021-03-26 11:39:05 -05:00
parent e719522e29
commit 9388ca6e90
2 changed files with 89 additions and 0 deletions
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12
scripts/lvm-vgchange.service Normal file
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[Unit]
Description=LVM event activation of VG %i
Documentation=man:vgchange(8)
DefaultDependencies=no
StartLimitIntervalSec=0
Before=shutdown.target
Conflicts=shutdown.target
[Service]
Type=oneshot
RemainAfterExit=no
ExecStart=@SBINDIR@/lvm vgchange -aay %i

77
udev/69-dm-lvm.rules Normal file
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# Copyright (C) 2012,2021 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.
# Udev rules for LVM.
#
# This rule requires blkid to be called on block devices before so only devices
# used as LVM PVs are processed (ID_FS_TYPE="LVM2_member").
SUBSYSTEM!="block", GOTO="lvm_end"
ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", GOTO="lvm_end"
# Only process devices already marked as a PV - this requires blkid to be called before.
ENV{ID_FS_TYPE}!="LVM2_member", GOTO="lvm_end"
ENV{DM_MULTIPATH_DEVICE_PATH}=="1", GOTO="lvm_end"
ACTION=="remove", GOTO="lvm_end"
# Create /dev/disk/by-id/lvm-pv-uuid-<PV_UUID> symlink for each PV
ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-id/lvm-pv-uuid-$env{ID_FS_UUID_ENC}"
# If the PV is a special device listed below, scan only if the device is
# properly activated. These devices are not usable after an ADD event,
# but they require an extra setup and they are ready after a CHANGE event.
# Also support coldplugging with ADD event but only if the device is already
# properly activated.
# This logic should be eventually moved to rules where those particular
# devices are processed primarily (MD and loop).
# DM device:
KERNEL!="dm-[0-9]*", GOTO="next"
ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}=="1", ENV{DM_ACTIVATION}=="1", GOTO="lvm_scan"
GOTO="lvm_end"
# MD device:
LABEL="next"
KERNEL!="md[0-9]*", GOTO="next"
IMPORT{db}="LVM_MD_PV_ACTIVATED"
ACTION=="add", ENV{LVM_MD_PV_ACTIVATED}=="1", GOTO="lvm_scan"
ACTION=="change", ENV{LVM_MD_PV_ACTIVATED}!="1", TEST=="md/array_state", ENV{LVM_MD_PV_ACTIVATED}="1", GOTO="lvm_scan"
ACTION=="add", KERNEL=="md[0-9]*p[0-9]*", GOTO="lvm_scan"
ENV{LVM_MD_PV_ACTIVATED}!="1", ENV{SYSTEMD_READY}="0"
GOTO="lvm_end"
# Loop device:
LABEL="next"
KERNEL!="loop[0-9]*", GOTO="next"
ACTION=="add", ENV{LVM_LOOP_PV_ACTIVATED}=="1", GOTO="lvm_scan"
ACTION=="change", ENV{LVM_LOOP_PV_ACTIVATED}!="1", TEST=="loop/backing_file", ENV{LVM_LOOP_PV_ACTIVATED}="1", GOTO="lvm_scan"
ENV{LVM_LOOP_PV_ACTIVATED}!="1", ENV{SYSTEMD_READY}="0"
GOTO="lvm_end"
LABEL="next"
ACTION!="add", GOTO="lvm_end"
LABEL="lvm_scan"
ENV{SYSTEMD_READY}="1"
# pvscan will check if this device completes a VG,
# i.e. all PVs in the VG are now present with the
# arrival of this PV. If so, it prints to stdout:
# LVM_VG_NAME_COMPLETE='foo'
#
# When the VG is complete it can be activated, so
# the lvm-vgchange service is started which runs
# vgchange -aay <vgname>.
#
# pvscan only reads the single device specified,
# and uses temp files under /run/lvm to check if
# other PVs in the VG are present.
IMPORT{program}="/usr/sbin/lvm pvscan --cache --listvg --checkcomplete --vgonline --udevoutput --journal=output $env{DEVNAME}"
ENV{LVM_VG_NAME_COMPLETE}=="?*", RUN+="/usr/bin/systemctl start lvm-vgchange@$env{LVM_VG_NAME_COMPLETE}.service"
GOTO="lvm_end"
LABEL="lvm_end"