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man: document the new BSD file lock logic in tmpfiles

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Lennart Poettering 2019-01-18 16:34:45 +01:00
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man/tmpfiles.d.xml
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@ -545,6 +545,14 @@ w- /proc/sys/vm/swappiness - - - - 10</programlisting></para>
(ctime). Any of these three (or two) values will prevent cleanup (ctime). Any of these three (or two) values will prevent cleanup
if it is more recent than the current time minus the age if it is more recent than the current time minus the age
field.</para> field.</para>
<para>Note that while the aging algorithm is run a 'shared' BSD file lock (see <citerefentry
project='man-pages'><refentrytitle>flock</refentrytitle><manvolnum>2</manvolnum></citerefentry>) is
taken on each directory the algorithm descends into (and each directory below that, and so on). If the
aging algorithm finds a lock is already taken on some directory, it (and everything below it) is
skipped. Applications may use this to temporarily exclude certain directory subtrees from the aging
algorithm: the applications can take a BSD file lock themselves, and as long as they keep it aging of
the directory and everything below it is disabled.</para>
</refsect2> </refsect2>
<refsect2> <refsect2>