Bugfixes.
The udev runtime data moved from /dev/.udev/ to /dev/.run/udev/.
-On new systems the tmpfs mountpoint /var/run/ will have an
-"early-boot alias" /dev/.run/ where udev and a couple of other
-early-boot tools will put their runtime data.
-On systems with LVM used, packagers must make sure, that the
-initramfs creates the /dev/.run/ mountpoint for udev to store
-the data, so that the real root will not overmount it, which
-would make it invisible.
+On systemd systems the tmpfs mountpoint /var/run/ will have a
+permanent "early-boot alias" /dev/.run/, where udev and a couple
+of other early-boot tools will put their runtime data.
+
+On systemd systems with LVM used, packagers must make sure, that
+the systemd and initramfs version match. The initramfs needs to
+create the /dev/.run/ mountpoint for udev to store the data, so
+that systemd will not overmount it, which would make the udev
+data from initramfs invisible.
The command 'udevadm info --convert-db' is gone. The udev daemon
itself, at startup, converts any old database version if necessary.