new udev and systemd autoactivationdev-dct-pvscan-list-4

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.

2 files changed, 89 insertions, 0 deletions

diff --git a/scripts/lvm-vgchange.service b/scripts/lvm-vgchange.service
new file mode 100644
index 000000000..bf7162690
--- /dev/null
+++ b/scripts/lvm-vgchange.service
@@ -0,0 +1,12 @@
+[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
diff --git a/udev/69-dm-lvm.rules b/udev/69-dm-lvm.rules
new file mode 100644
index 000000000..29a2070b3
--- /dev/null
+++ b/udev/69-dm-lvm.rules
@@ -0,0 +1,77 @@
+# 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"