man/systemd-fsck@.service.xml

   1 <?xml version="1.0"?>
   2 <!--*-nxml-*-->
   3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   4   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   5 <!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
   6 <refentry id="systemd-fsck@.service">
   7
   8   <refentryinfo>
   9     <title>systemd-fsck@.service</title>
  10     <productname>systemd</productname>
  11   </refentryinfo>
  12
  13   <refmeta>
  14     <refentrytitle>systemd-fsck@.service</refentrytitle>
  15     <manvolnum>8</manvolnum>
  16   </refmeta>
  17
  18   <refnamediv>
  19     <refname>systemd-fsck@.service</refname>
  20     <refname>systemd-fsck-root.service</refname>
  21     <refname>systemd-fsck-usr.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>systemd-fsck-usr.service</filename></para>
  30     <para><filename>/usr/lib/systemd/systemd-fsck</filename></para>
  31   </refsynopsisdiv>
  32
  33   <refsect1>
  34     <title>Description</title>
  35
  36     <para><filename>systemd-fsck@.service</filename>, <filename>systemd-fsck-root.service</filename>, and
  37     <filename>systemd-fsck-usr.service</filename> are services responsible for file system checks. They are
  38     instantiated for each device that is configured for file system checking.
  39     <filename>systemd-fsck-root.service</filename> and <filename>systemd-fsck-usr.service</filename> are
  40     responsible for file system checks on the root and /usr file system, respectively, but only if the root
  41     filesystem was not checked in the initrd. <filename>systemd-fsck@.service</filename> is used for all
  42     other file systems and for the root file system in the initrd.</para>
  43
  44     <para>These services are started at boot if
  45     <option>passno</option> in <filename>/etc/fstab</filename> for the
  46     file system is set to a value greater than zero. The file system
  47     check for root is performed before the other file systems. Other
  48     file systems may be checked in parallel, except when they are on
  49     the same rotating disk.</para>
  50
  51     <para><filename>systemd-fsck</filename> does not know any details
  52     about specific filesystems, and simply executes file system
  53     checkers specific to each filesystem type
  54     (<filename>/sbin/fsck.<replaceable>type</replaceable></filename>). These checkers will decide if
  55     the filesystem should actually be checked based on the time since
  56     last check, number of mounts, unclean unmount, etc.</para>
  57
  58     <para><filename>systemd-fsck-root.service</filename> and <filename>systemd-fsck-usr.service</filename>
  59     will activate <filename>reboot.target</filename> if <filename>/sbin/fsck</filename> returns the "System
  60     should reboot" condition, or <filename>emergency.target</filename> if <filename>/sbin/fsck</filename>
  61     returns the "Filesystem errors left uncorrected" condition.</para>
  62
  63     <para><filename>systemd-fsck@.service</filename> will fail if
  64     <filename>/sbin/fsck</filename> returns with either "System should reboot"
  65     or "Filesystem errors left uncorrected" conditions. For filesystems
  66     listed in <filename>/etc/fstab</filename> without <literal>nofail</literal>
  67     or <literal>noauto</literal> options, <literal>local-fs.target</literal>
  68     will then activate <filename>emergency.target</filename>.</para>
  69   </refsect1>
  70
  71   <refsect1>
  72     <title>Kernel Command Line</title>
  73
  74     <para><filename>systemd-fsck</filename> understands these kernel
  75     command line parameters:</para>
  76
  77     <variablelist class='kernel-commandline-options'>
  78       <varlistentry>
  79         <term><varname>fsck.mode=</varname></term>
  80
  81         <listitem><para>One of <literal>auto</literal>,
  82         <literal>force</literal>, <literal>skip</literal>. Controls
  83         the mode of operation. The default is <literal>auto</literal>,
  84         and ensures that file system checks are done when the file
  85         system checker deems them necessary. <literal>force</literal>
  86         unconditionally results in full file system checks.
  87         <literal>skip</literal> skips any file system
  88         checks.</para></listitem>
  89       </varlistentry>
  90
  91       <varlistentry>
  92         <term><varname>fsck.repair=</varname></term>
  93
  94         <listitem><para>One of <literal>preen</literal>,
  95         <literal>yes</literal>, <literal>no</literal>. Controls the
  96         mode of operation. The default is <literal>preen</literal>,
  97         and will automatically repair problems that can be safely
  98         fixed. <literal>yes</literal> will answer yes to all
  99         questions by fsck and <literal>no</literal> will answer no to
 100         all questions. </para></listitem>
 101       </varlistentry>
 102     </variablelist>
 103   </refsect1>
 104
 105   <refsect1>
 106     <title>See Also</title>
 107     <para>
 108       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 109       <citerefentry project='man-pages'><refentrytitle>fsck</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 110       <citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 111       <citerefentry project='man-pages'><refentrytitle>fsck.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 112       <citerefentry project='man-pages'><refentrytitle>fsck.cramfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 113       <citerefentry project='man-pages'><refentrytitle>fsck.ext4</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 114       <citerefentry project='man-pages'><refentrytitle>fsck.fat</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 115       <citerefentry project='man-pages'><refentrytitle>fsck.hfsplus</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 116       <citerefentry project='man-pages'><refentrytitle>fsck.minix</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 117       <citerefentry project='man-pages'><refentrytitle>fsck.ntfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 118       <citerefentry project='man-pages'><refentrytitle>fsck.xfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 119     </para>
 120   </refsect1>
 121
 122 </refentry>