man: add a note about _netdev usage

diff --git a/man/crypttab.xml b/man/crypttab.xml
index caed04836e32df3a21491a612ffa012d7df4c38d..3aebd7ea9025eeb5df24cb3f69ff7ec395c7a6e8 100644 (file)
--- a/man/crypttab.xml
+++ b/man/crypttab.xml
@@ -201,7 +201,16 @@
         will be ordered between <filename>remote-fs-pre.target</filename> and
         <filename>remote-cryptsetup.target</filename>, instead of
         <filename>cryptsetup-pre.target</filename> and
-        <filename>cryptsetup.target</filename>.</para></listitem>
+        <filename>cryptsetup.target</filename>.</para>
+
+        <para>Hint: if this device is used for a mount point that is specified in
+        <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+        the <option>_netdev</option> option should also be used for the mount
+        point. Otherwise, a dependency loop might be created where the mount point
+        will be pulled in by <filename>local-fs.target</filename>, while the
+        service to configure the network is usually only started <emphasis>after</emphasis>
+        the local file system has been mounted.</para>
+        </listitem>
       </varlistentry>
 
       <varlistentry>
@@ -433,6 +442,7 @@ hidden     /mnt/tc_hidden  /dev/null    tcrypt-hidden,tcrypt-keyfile=/etc/keyfil
       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemd-cryptsetup@.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
       <citerefentry project='die-net'><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>mkswap</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>mke2fs</refentrytitle><manvolnum>8</manvolnum></citerefentry>