/usr/lib/dracut/modules.d/90dm
NameSizeModeActions
11-dm.rules1420644editdlrm
59-persistent-storage-dm.rules6690644editdlrm
dm-pre-udev.sh1070755editdlrm
dm-shutdown.sh12610755editdlrm
module-setup.sh10130755editdlrm
Edit: /usr/lib/dracut/modules.d/90dm/dm-pre-udev.sh (107B)
#!/usr/bin/sh strstr "$(cat /proc/misc)" device-mapper || modprobe dm_mod modprobe dm_mirror 2> /dev/null