lvm2: fix shared object file dlopen failed

Add the variable snapshot_library into config file(lvm.conf), so it
can link the correct shared object files with correct path.

Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/lvm2/lvm2.inc

@@ -37,6 +37,7 @@ inherit autotools pkgconfig systemd
 do_install_append() {
     # Install machine specific configuration file
     install -m 0644 ${WORKDIR}/lvm.conf ${D}${sysconfdir}/lvm/lvm.conf
+    sed -i -e 's:@libdir@:${libdir}:g' ${D}${sysconfdir}/lvm/lvm.conf
     install -d ${D}${systemd_unitdir}/system
     install -m 0644 ${B}/scripts/lvm2_monitoring_systemd_red_hat.service ${D}${systemd_unitdir}/system/lvm2-monitor.service
     install -m 0644 ${B}/scripts/dm_event_systemd_red_hat.socket ${D}${systemd_unitdir}/system/dm-event.socket

meta-oe/recipes-support/lvm2/lvm2/lvm.conf

@@ -289,4 +289,38 @@ activation {
     # dirs = [ "/etc/lvm/metadata", "/mnt/disk2/lvm/metadata2" ]
 #}
 
+# Event daemon
+#
+dmeventd {
+    # mirror_library is the library used when monitoring a mirror device.
+    #
+    # "libdevmapper-event-lvm2mirror.so" attempts to recover from
+    # failures.  It removes failed devices from a volume group and
+    # reconfigures a mirror as necessary. If no mirror library is
+    # provided, mirrors are not monitored through dmeventd.
+
+    mirror_library = "@libdir@/device-mapper/libdevmapper-event-lvm2mirror.so"
+
+    # snapshot_library is the library used when monitoring a snapshot device.
+    #
+    # "libdevmapper-event-lvm2snapshot.so" monitors the filling of
+    # snapshots and emits a warning through syslog when the use of
+    # the snapshot exceeds 80%. The warning is repeated when 85%, 90% and
+    # 95% of the snapshot is filled.
+
+    snapshot_library = "@libdir@/device-mapper/libdevmapper-event-lvm2snapshot.so"
+
+    # thin_library is the library used when monitoring a thin device.
+    #
+    # "libdevmapper-event-lvm2thin.so" monitors the filling of
+    # pool and emits a warning through syslog when the use of
+    # the pool exceeds 80%. The warning is repeated when 85%, 90% and
+    # 95% of the pool is filled.
+
+    thin_library = "@libdir@/device-mapper/libdevmapper-event-lvm2thin.so"
+
+    # Full path of the dmeventd binary.
+    #
+    # executable = "@DMEVENTD_PATH@"
+}