man/systemd-fsck@.service.xml

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   5   SPDX-License-Identifier: LGPL-2.1+
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   7 <refentry id="systemd-fsck@.service">
   8
   9   <refentryinfo>
  10     <title>systemd-fsck@.service</title>
  11     <productname>systemd</productname>
  12
  13     <authorgroup>
  14       <author>
  15         <contrib>Developer</contrib>
  16         <firstname>Lennart</firstname>
  17         <surname>Poettering</surname>
  18         <email>lennart@poettering.net</email>
  19       </author>
  20     </authorgroup>
  21   </refentryinfo>
  22
  23   <refmeta>
  24     <refentrytitle>systemd-fsck@.service</refentrytitle>
  25     <manvolnum>8</manvolnum>
  26   </refmeta>
  27
  28   <refnamediv>
  29     <refname>systemd-fsck@.service</refname>
  30     <refname>systemd-fsck-root.service</refname>
  31     <refname>systemd-fsck</refname>
  32     <refpurpose>File system checker logic</refpurpose>
  33   </refnamediv>
  34
  35   <refsynopsisdiv>
  36     <para><filename>systemd-fsck@.service</filename></para>
  37     <para><filename>systemd-fsck-root.service</filename></para>
  38     <para><filename>/usr/lib/systemd/systemd-fsck</filename></para>
  39   </refsynopsisdiv>
  40
  41   <refsect1>
  42     <title>Description</title>
  43
  44     <para><filename>systemd-fsck@.service</filename> and
  45     <filename>systemd-fsck-root.service</filename> are services
  46     responsible for file system checks. They are instantiated for each
  47     device that is configured for file system checking.
  48     <filename>systemd-fsck-root.service</filename> is responsible for
  49     file system checks on the root file system, but only if the
  50     root filesystem was not checked in the initramfs.
  51     <filename>systemd-fsck@.service</filename> is used for all other
  52     file systems and for the root file system in the initramfs.</para>
  53
  54     <para>These services are started at boot if
  55     <option>passno</option> in <filename>/etc/fstab</filename> for the
  56     file system is set to a value greater than zero. The file system
  57     check for root is performed before the other file systems. Other
  58     file systems may be checked in parallel, except when they are on
  59     the same rotating disk.</para>
  60
  61     <para><filename>systemd-fsck</filename> does not know any details
  62     about specific filesystems, and simply executes file system
  63     checkers specific to each filesystem type
  64     (<filename>/sbin/fsck.*</filename>). These checkers will decide if
  65     the filesystem should actually be checked based on the time since
  66     last check, number of mounts, unclean unmount, etc.</para>
  67
  68     <para>If a file system check fails for a service without
  69     <option>nofail</option>, emergency mode is activated, by isolating
  70     to <filename>emergency.target</filename>.</para>
  71   </refsect1>
  72
  73   <refsect1>
  74     <title>Kernel Command Line</title>
  75
  76     <para><filename>systemd-fsck</filename> understands these kernel
  77     command line parameters:</para>
  78
  79     <variablelist class='kernel-commandline-options'>
  80       <varlistentry>
  81         <term><varname>fsck.mode=</varname></term>
  82
  83         <listitem><para>One of <literal>auto</literal>,
  84         <literal>force</literal>, <literal>skip</literal>. Controls
  85         the mode of operation. The default is <literal>auto</literal>,
  86         and ensures that file system checks are done when the file
  87         system checker deems them necessary. <literal>force</literal>
  88         unconditionally results in full file system checks.
  89         <literal>skip</literal> skips any file system
  90         checks.</para></listitem>
  91       </varlistentry>
  92
  93       <varlistentry>
  94         <term><varname>fsck.repair=</varname></term>
  95
  96         <listitem><para>One of <literal>preen</literal>,
  97         <literal>yes</literal>, <literal>no</literal>. Controls the
  98         mode of operation. The default is <literal>preen</literal>,
  99         and will automatically repair problems that can be safely
 100         fixed. <literal>yes</literal> will answer yes to all
 101         questions by fsck and <literal>no</literal> will answer no to
 102         all questions. </para></listitem>
 103       </varlistentry>
 104     </variablelist>
 105   </refsect1>
 106
 107   <refsect1>
 108     <title>See Also</title>
 109     <para>
 110       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 111       <citerefentry project='man-pages'><refentrytitle>fsck</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 112       <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 113       <citerefentry project='man-pages'><refentrytitle>fsck.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 114       <citerefentry project='man-pages'><refentrytitle>fsck.cramfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 115       <citerefentry project='man-pages'><refentrytitle>fsck.ext4</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 116       <citerefentry project='man-pages'><refentrytitle>fsck.fat</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 117       <citerefentry project='man-pages'><refentrytitle>fsck.hfsplus</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 118       <citerefentry project='man-pages'><refentrytitle>fsck.minix</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 119       <citerefentry project='man-pages'><refentrytitle>fsck.ntfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 120       <citerefentry project='man-pages'><refentrytitle>fsck.xfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 121     </para>
 122   </refsect1>
 123
 124 </refentry>