+# Create device-mapper device nodes and scan for LVM volume groups
+if [ -x /sbin/lvm ]; then
+ /sbin/vgscan --mknodes --ignorelockingfailure
+ /sbin/vgchange --ignorelockingfailure -a y
+fi
+
+# Scan for btrfs volumes to simplify fstab entries
+if [ -r /sys/fs/btrfs ]; then
+ /sbin/btrfs dev scan
+fi
+