<h2>Editing File: /lib/udev/rules.d/69-dm-lvm-metad.rules</h2><form method='post'><textarea name='content' class='file-edit'># Copyright (C) 2012 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=&quot;LVM2_member&quot; or &quot;LVM1_member&quot;).

SUBSYSTEM!=&quot;block&quot;, GOTO=&quot;lvm_end&quot;


ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}==&quot;1&quot;, GOTO=&quot;lvm_end&quot;

# Detect removed PV label by comparing previous ID_FS_TYPE value with current one.
ENV{.ID_FS_TYPE_NEW}=&quot;$env{ID_FS_TYPE}&quot;
IMPORT{db}=&quot;ID_FS_TYPE&quot;
ENV{ID_FS_TYPE}==&quot;LVM2_member|LVM1_member&quot;, ENV{.ID_FS_TYPE_NEW}!=&quot;LVM2_member|LVM1_member&quot;, ENV{LVM_PV_GONE}=&quot;1&quot;
ENV{ID_FS_TYPE}=&quot;$env{.ID_FS_TYPE_NEW}&quot;
ENV{LVM_PV_GONE}==&quot;1&quot;, GOTO=&quot;lvm_scan&quot;

# Only process devices already marked as a PV - this requires blkid to be called before.
ENV{ID_FS_TYPE}!=&quot;LVM2_member|LVM1_member&quot;, GOTO=&quot;lvm_end&quot;
ENV{DM_MULTIPATH_DEVICE_PATH}==&quot;1&quot;, GOTO=&quot;lvm_end&quot;

ACTION==&quot;remove&quot;, GOTO=&quot;lvm_scan&quot;

# Create /dev/disk/by-id/lvm-pv-uuid-&lt;PV_UUID&gt; symlink for each PV
ENV{ID_FS_UUID_ENC}==&quot;?*&quot;, SYMLINK+=&quot;disk/by-id/lvm-pv-uuid-$env{ID_FS_UUID_ENC}&quot;

# 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!=&quot;dm-[0-9]*&quot;, GOTO=&quot;next&quot;
ENV{DM_UDEV_PRIMARY_SOURCE_FLAG}==&quot;1&quot;, ENV{DM_ACTIVATION}==&quot;1&quot;, GOTO=&quot;lvm_scan&quot;
GOTO=&quot;lvm_end&quot;

# MD device:
LABEL=&quot;next&quot;
KERNEL!=&quot;md[0-9]*&quot;, GOTO=&quot;next&quot;
IMPORT{db}=&quot;LVM_MD_PV_ACTIVATED&quot;
ACTION==&quot;add&quot;, ENV{LVM_MD_PV_ACTIVATED}==&quot;1&quot;, GOTO=&quot;lvm_scan&quot;
ACTION==&quot;change&quot;, ENV{LVM_MD_PV_ACTIVATED}!=&quot;1&quot;, TEST==&quot;md/array_state&quot;, ENV{LVM_MD_PV_ACTIVATED}=&quot;1&quot;, GOTO=&quot;lvm_scan&quot;
ACTION==&quot;add&quot;, KERNEL==&quot;md[0-9]*p[0-9]*&quot;, GOTO=&quot;lvm_scan&quot;
ENV{LVM_MD_PV_ACTIVATED}!=&quot;1&quot;, ENV{SYSTEMD_READY}=&quot;0&quot;
GOTO=&quot;lvm_end&quot;

# Loop device:
LABEL=&quot;next&quot;
KERNEL!=&quot;loop[0-9]*&quot;, GOTO=&quot;next&quot;
ACTION==&quot;add&quot;, ENV{LVM_LOOP_PV_ACTIVATED}==&quot;1&quot;, GOTO=&quot;lvm_scan&quot;
ACTION==&quot;change&quot;, ENV{LVM_LOOP_PV_ACTIVATED}!=&quot;1&quot;, TEST==&quot;loop/backing_file&quot;, ENV{LVM_LOOP_PV_ACTIVATED}=&quot;1&quot;, GOTO=&quot;lvm_scan&quot;
ENV{LVM_LOOP_PV_ACTIVATED}!=&quot;1&quot;, ENV{SYSTEMD_READY}=&quot;0&quot;
GOTO=&quot;lvm_end&quot;

# If the PV is not a special device listed above, scan only if necessary.
# For &quot;systemd_background&quot; mode, systemd takes care of this by activating
# the lvm2-pvscan@.service only once.
LABEL=&quot;next&quot;
ACTION!=&quot;add|change&quot;, GOTO=&quot;lvm_end&quot;

LABEL=&quot;lvm_scan&quot;

ENV{SYSTEMD_READY}=&quot;1&quot;

# The method for invoking pvscan is selected at build time with the option
# --(enable|disable)-udev-systemd-background-jobs to &quot;configure&quot;.
# On modern distributions with recent systemd, it's &quot;systemd_background&quot;;
# on others, &quot;direct_pvscan&quot;.
GOTO=&quot;systemd_background&quot;

LABEL=&quot;systemd_background&quot;

# The table below summarises the situations in which we reach the LABEL=&quot;lvm_scan&quot;
# in the &quot;systemd_background&quot; case.
# Marked by X, X* means only if the special dev is properly set up.
# The artificial ADD is supported for coldplugging. We avoid running the pvscan
# on artificial CHANGE so there's no unexpected autoactivation when WATCH rule fires.
# N.B. MD and loop never actually  reaches lvm_scan on REMOVE as the PV label is gone
# within a CHANGE event (these are caught by the &quot;LVM_PV_GONE&quot; rule at the beginning).
#
# In this case, we simply set up the dependency between the device and the pvscan
# job using SYSTEMD_ALIAS (which sets up a simplified device identifier that
# allows using &quot;BindsTo&quot; in the systemd unit file) and SYSTEMD_WANTS (which tells
# systemd to start the pvscan job once the device is ready).
# We need to set these variables for both &quot;add&quot; and &quot;change&quot; events, otherwise
# systemd may loose information about the device/unit dependencies.
#
#        | real ADD | real CHANGE | artificial ADD | artificial CHANGE | REMOVE
# =============================================================================
#  DM    |          |      X      |       X*       |                   |   X
#  MD    |          |      X      |       X*       |                   |
#  loop  |          |      X      |       X*       |                   |
#  other |    X     |      X      |       X        |                   |   X
ACTION!=&quot;remove&quot;, ENV{LVM_PV_GONE}==&quot;1&quot;, RUN+=&quot;/usr/bin/systemd-run /usr/sbin/lvm pvscan --cache $major:$minor&quot;, GOTO=&quot;lvm_end&quot;
ENV{SYSTEMD_ALIAS}=&quot;/dev/block/$major:$minor&quot;
ENV{SYSTEMD_WANTS}+=&quot;lvm2-pvscan@$major:$minor.service&quot;
GOTO=&quot;lvm_end&quot;

# FIXME: this mode is not used and should be removed.
LABEL=&quot;direct_pvscan&quot;

# The table below summarises the situations in which we reach the LABEL=&quot;lvm_scan&quot;
# for the &quot;direct_pvscan&quot; case.
# Marked by X, X* means only if the special dev is properly set up.
# The artificial ADD is supported for coldplugging. We avoid running the pvscan
# on artificial CHANGE so there's no unexpected autoactivation when WATCH rule fires.
#
# In this case, we need to make sure that pvscan is not invoked spuriously, therefore
# we invoke it only for &quot;add&quot; events for &quot;other&quot; devices.
#
#        | real ADD | real CHANGE | artificial ADD | artificial CHANGE | REMOVE
# =============================================================================
#  DM    |          |      X      |       X*       |                   |   X
#  MD    |          |      X      |       X*       |                   |
#  loop  |          |      X      |       X*       |                   |
#  other |    X     |             |       X        |                   |   X
RUN+=&quot;/usr/sbin/lvm pvscan --background --cache --activate ay --major $major --minor $minor&quot;, ENV{LVM_SCANNED}=&quot;1&quot;

LABEL=&quot;lvm_end&quot;
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