lvm2/0006-new-udev-and-systemd-autoactivation.patch

From 99f93ea6fc8cdce934768fb748f75ac549612164 Mon Sep 17 00:00:00 2001
From: David Teigland <teigland@redhat.com>
Date: Fri, 26 Mar 2021 11:39:05 -0500
Subject: [PATCH 06/10] new udev and systemd autoactivation

new udev rule: 69-dm-lvm.rules

. calls pvscan directly on the added device
. pvscan output indicates if a complete VG can be
  activated
. the complete VG name to activate is set in env var
  LVM_VG_NAME_COMPLETE
. this replaces 69-dm-lvm-meta.rules

new unit file: lvm-vgchange@.service

. udev rule above starts this using systemctl start
  if LVM_VG_NAME_COMPLETE is set
. the service runs vgchange -aay on the vg
. this replaces lvm2-pvscan@.service
---
 configure.ac                    |  1 +
 scripts/Makefile.in             |  3 +-
 scripts/lvm-vgchange.service.in | 12 +++++++
 scripts/lvmdump.sh.in           |  3 ++
 udev/69-dm-lvm.rules.in         | 80 +++++++++++++++++++++++++++++++++++++++++
 udev/Makefile.in                |  2 +-
 7 files changed, 101 insertions(+), 4 deletions(-)
 create mode 100644 scripts/lvm-vgchange.service.in
 create mode 100644 udev/69-dm-lvm.rules.in

diff --git a/configure.ac b/configure.ac
index 9d8193c..d0f1049 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1966,6 +1966,7 @@ libdm/libdevmapper.pc
 man/Makefile
 po/Makefile
 scripts/lvm2-pvscan.service
+scripts/lvm-vgchange.service
 scripts/blkdeactivate.sh
 scripts/blk_availability_init_red_hat
 scripts/blk_availability_systemd_red_hat.service
diff --git a/scripts/Makefile.in b/scripts/Makefile.in
index e8f6742..4ba5aca 100644
--- a/scripts/Makefile.in
+++ b/scripts/Makefile.in
@@ -88,7 +88,7 @@ install_systemd_generators:
 install_systemd_units:	install_dbus_service
 	@echo "    [INSTALL] systemd_units"
 	$(Q) $(INSTALL_DIR) $(systemd_unit_dir)
-	$(Q) $(INSTALL_DATA) lvm2-pvscan.service $(systemd_unit_dir)/lvm2-pvscan@.service
+	$(Q) $(INSTALL_DATA) lvm-vgchange.service $(systemd_unit_dir)/lvm-vgchange@.service
 ifeq ("@BUILD_DMEVENTD@", "yes")
 	$(Q) $(INSTALL_DATA) dm_event_systemd_red_hat.socket $(systemd_unit_dir)/dm-event.socket
 	$(Q) $(INSTALL_DATA) dm_event_systemd_red_hat.service $(systemd_unit_dir)/dm-event.service
@@ -139,6 +139,7 @@ DISTCLEAN_TARGETS += \
 	dm_event_systemd_red_hat.socket \
 	lvmdump.sh \
 	lvm2-pvscan.service \
+	lvm-vgchange.service \
 	lvm2_cluster_activation_red_hat.sh \
 	lvm2_cluster_activation_systemd_red_hat.service \
 	lvm2_clvmd_systemd_red_hat.service \
diff --git a/scripts/lvm-vgchange.service.in b/scripts/lvm-vgchange.service.in
new file mode 100644
index 0000000..8ae0df8
--- /dev/null
+++ b/scripts/lvm-vgchange.service.in
@@ -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 --config log/prefix=\"\" %i
diff --git a/scripts/lvmdump.sh.in b/scripts/lvmdump.sh.in
index 0685d85..91340dd 100644
--- a/scripts/lvmdump.sh.in
+++ b/scripts/lvmdump.sh.in
@@ -300,6 +300,9 @@ if (( sysreport )); then
 		for unit in $("$GREP" lvm2-pvscan "$sysreport_dir/systemd_unit_list" | cut -d " " -f 1); do
 			log "$SYSTEMCTL status -l --no-pager -n $log_lines -o short-precise $unit >> \"$sysreport_dir/systemd_lvm2_pvscan_service_status\""
 		done
+		for unit in $("$GREP" lvm-vgchange "$sysreport_dir/systemd_unit_list" | cut -d " " -f 1); do
+			log "$SYSTEMCTL status -l --no-pager -n $log_lines -o short-precise $unit >> \"$sysreport_dir/systemd_lvm_vgchange_service_status\""
+		done
 	fi
 fi
 
diff --git a/udev/69-dm-lvm.rules.in b/udev/69-dm-lvm.rules.in
new file mode 100644
index 0000000..9869d1b
--- /dev/null
+++ b/udev/69-dm-lvm.rules.in
@@ -0,0 +1,80 @@
+# Copyright (C) 2012,2021 Red Hat, Inc. All rights reserved.
+#
+# This file is part of 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"
+(LVM_EXEC_RULE)
+
+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.
+#
+# If event_activation=0 in lvm.conf, this pvscan
+# (using checkcomplete) will do nothing, so that
+# no event-based autoactivation will be happen.
+
+IMPORT{program}="(LVM_EXEC)/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"
diff --git a/udev/Makefile.in b/udev/Makefile.in
index e32cba9..e777dda 100644
--- a/udev/Makefile.in
+++ b/udev/Makefile.in
@@ -18,7 +18,7 @@ top_builddir = @top_builddir@
 include $(top_builddir)/make.tmpl
 
 DM_RULES=10-dm.rules 13-dm-disk.rules 95-dm-notify.rules
-LVM_RULES=11-dm-lvm.rules 69-dm-lvm-metad.rules
+LVM_RULES=11-dm-lvm.rules 69-dm-lvm.rules
 
 DM_DIR=$(shell $(GREP) "\#define DM_DIR" $(top_srcdir)/libdm/misc/dm-ioctl.h | $(AWK) '{print $$3}')
 
-- 
1.8.3.1