- <para><filename>systemd-remount-fs.service</filename>
- is an early-boot service that applies mount options
- listed in
- <citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- to the root file system, the <filename>/usr</filename>
- file system and the kernel API file systems. This is
- required so that the mount options of these file
- systems -- which are pre-mounted by the kernel, the
- initial RAM disk, container environments or system
- manager code -- are updated to those listed in
- <filename>/etc/fstab</filename>. This service ignores
- normal file systems and only changes the root file
- system (i.e. <filename>/</filename>),
- <filename>/usr</filename> and the virtual kernel API
- file systems such as <filename>/proc</filename>,
- <filename>/sys</filename> or
- <filename>/dev</filename>. This service executes no
- operation if <filename>/etc/fstab</filename> does not
- exist or lists no entries for the mentioned file
- systems.</para>
+ <para>For a longer discussion of kernel API file systems see
+ <ulink url="https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems">API
+ File Systems</ulink>.</para>