"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
+ SPDX-License-Identifier: LGPL-2.1+
+
This file is part of systemd.
Copyright 2010 Lennart Poettering
<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
which define the execution environment the <citerefentry
project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- binary is executed in, in
+ program is executed in, in
<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
which define the way these processes are
terminated, and in
which configure resource control settings for these processes of the
unit.</para>
- <para>Swap units must be named after the devices
- or files they control. Example: the swap device
- <filename noindex='true'>/dev/sda5</filename> must be configured in a
- unit file <filename>dev-sda5.swap</filename>. For details about
- the escaping logic used to convert a file system path to a unit
- name, see
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
+ <para>Swap units must be named after the devices or files they control. Example: the swap device <filename
+ noindex='true'>/dev/sda5</filename> must be configured in a unit file <filename>dev-sda5.swap</filename>. For
+ details about the escaping logic used to convert a file system path to a unit name, see
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. Note that swap
+ units cannot be templated, nor is possible to add multiple names to a swap unit by creating additional symlinks to
+ it.</para>
</refsect1>
<refsect1>
- <title>Automatic Dependencies</title>
+ <title>Implicit Dependencies</title>
- <para>All swap units automatically get the
- <varname>BindsTo=</varname> and <varname>After=</varname>
- dependencies on the device units or the mount units of the files
- they are activated from.</para>
+ <para>The following dependencies are implicitly added:</para>
- <para>Swap units with <varname>DefaultDependencies=</varname>
- enabled implicitly acquire a <varname>Conflicts=</varname> and an
- <varname>After=</varname> dependency on
- <filename>umount.target</filename> so that they are deactivated at
- shutdown, unless <varname>DefaultDependencies=no</varname> is
- specified.</para>
+ <itemizedlist>
+ <listitem><para>All swap units automatically get the
+ <varname>BindsTo=</varname> and <varname>After=</varname>
+ dependencies on the device units or the mount units of the files
+ they are activated from.</para></listitem>
+ </itemizedlist>
<para>Additional implicit dependencies may be added as result of
execution and resource control parameters as documented in
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</refsect1>
+ <refsect1>
+ <title>Default Dependencies</title>
+
+ <para>The following dependencies are added unless <varname>DefaultDependencies=no</varname> is set:</para>
+
+ <itemizedlist>
+ <listitem><para>Swap units automatically acquire a <varname>Conflicts=</varname> and a
+ <varname>Before=</varname> dependency on <filename>umount.target</filename> so that they are deactivated at
+ shutdown as well as a <varname>Before=swap.target</varname> dependency.</para></listitem>
+ </itemizedlist>
+ </refsect1>
+
<refsect1>
<title><filename>fstab</filename></title>
<varlistentry>
<term><varname>What=</varname></term>
- <listitem><para>Takes an absolute path of a device node or
- file to use for paging. See
- <citerefentry project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- for details. If this refers to a device node, a dependency on
- the respective device unit is automatically created. (See
- <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for more information.) If this refers to a file, a dependency
- on the respective mount unit is automatically created. (See
- <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for more information.) This option is
- mandatory.</para></listitem>
+ <listitem><para>Takes an absolute path of a device node or file to use for paging. See <citerefentry
+ project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry> for
+ details. If this refers to a device node, a dependency on the respective device unit is automatically
+ created. (See
+ <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more
+ information.) If this refers to a file, a dependency on the respective mount unit is automatically
+ created. (See <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for more information.) This option is mandatory. Note that the usual specifier expansion is applied to this
+ setting, literal percent characters should hence be written as <literal>%%</literal>.</para></listitem>
</varlistentry>
<varlistentry>
<varlistentry>
<term><varname>Options=</varname></term>
- <listitem><para>May contain an option string for the swap
- device. This may be used for controlling discard options among
- other functionality, if the swap backing device supports the
- discard or trim operation. (See
+ <listitem><para>May contain an option string for the swap device. This may be used for controlling discard
+ options among other functionality, if the swap backing device supports the discard or trim operation. (See
<citerefentry project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- for more information.) </para></listitem>
+ for more information.) Note that the usual specifier expansion is applied to this setting, literal percent
+ characters should hence be written as <literal>%%</literal>.</para></listitem>
</varlistentry>
<varlistentry>
projects / thirdparty / systemd.git / blobdiff