SUBSYSTEM=="block", TAG="systemd"
+# DM finds it funny to create additional device nodes, we need to
+merge them here, so that we recognize identical devices.
+SUBSYSTEM=="block", ENV{DM_NAME}!="", ENV{SYSTEMD_ALIAS}="/dev/mapper/$env{DM_NAME}"
+
# We need a hardware independent way to identify network devices. We
# use the /sys/subsystem path for this. Current vanilla kernels don't
# actually support that hierarchy right now, however upcoming kernels