+* when the fstab-generator runs in the initrd, it should create a /dev/null mask for systemd-fsck-root.service, to avoid that the the root fs is fsck'ed twice.
+
+* maybe introduce WantsMountsFor=? Usecase:
+ http://lists.freedesktop.org/archives/systemd-devel/2015-January/027729.html
+