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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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commit aa1f2e52e8
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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
if it is more recent than the current time minus the age
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>