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