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systemd/man/systemd-fsck@.service.xml

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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd-fsck@.service">
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<refentryinfo>
<title>systemd-fsck@.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-fsck@.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-fsck@.service</refname>
<refname>systemd-fsck-root.service</refname>
<refname>systemd-fsck</refname>
<refpurpose>File system checker logic</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-fsck@.service</filename></para>
<para><filename>systemd-fsck-root.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-fsck</filename></para>
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</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-fsck@.service</filename> and <filename>systemd-fsck-root.service</filename> are
services responsible for file system checks. They are instantiated for each device that is configured for
file system checking. <filename>systemd-fsck-root.service</filename> is responsible for file system
checks on the root file system, but only if the root filesystem was not checked in the initrd.
<filename>systemd-fsck@.service</filename> is used for all other file systems and for the root file
system in the initrd.</para>
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<para>These services are started at boot if
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<option>passno</option> in <filename>/etc/fstab</filename> for the
file system is set to a value greater than zero. The file system
check for root is performed before the other file systems. Other
file systems may be checked in parallel, except when they are on
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the same rotating disk.</para>
<para><filename>systemd-fsck</filename> does not know any details
about specific filesystems, and simply executes file system
checkers specific to each filesystem type
(<filename>/sbin/fsck.<replaceable>type</replaceable></filename>). These checkers will decide if
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the filesystem should actually be checked based on the time since
last check, number of mounts, unclean unmount, etc.</para>
<para><filename>systemd-fsck-root.service</filename> will activate
<filename>reboot.target</filename> if <filename>/sbin/fsck</filename>
returns the "System should reboot" condition, or
<filename>emergency.target</filename> if <filename>/sbin/fsck</filename>
returns the "Filesystem errors left uncorrected" condition.</para>
<para><filename>systemd-fsck@.service</filename> will fail if
<filename>/sbin/fsck</filename> returns with either "System should reboot"
or "Filesystem errors left uncorrected" conditions. For filesystems
listed in <filename>/etc/fstab</filename> without <literal>nofail</literal>
or <literal>noauto</literal> options, <literal>local-fs.target</literal>
will then activate <filename>emergency.target</filename>.</para>
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</refsect1>
<refsect1>
<title>Kernel Command Line</title>
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<para><filename>systemd-fsck</filename> understands these kernel
command line parameters:</para>
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<variablelist class='kernel-commandline-options'>
<varlistentry>
<term><varname>fsck.mode=</varname></term>
<listitem><para>One of <literal>auto</literal>,
<literal>force</literal>, <literal>skip</literal>. Controls
the mode of operation. The default is <literal>auto</literal>,
and ensures that file system checks are done when the file
system checker deems them necessary. <literal>force</literal>
unconditionally results in full file system checks.
<literal>skip</literal> skips any file system
checks.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>fsck.repair=</varname></term>
<listitem><para>One of <literal>preen</literal>,
<literal>yes</literal>, <literal>no</literal>. Controls the
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mode of operation. The default is <literal>preen</literal>,
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and will automatically repair problems that can be safely
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fixed. <literal>yes</literal> will answer yes to all
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questions by fsck and <literal>no</literal> will answer no to
all questions. </para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-quotacheck.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck.cramfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck.ext4</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck.fat</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck.hfsplus</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck.minix</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck.ntfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>fsck.xfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
</refsect1>
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</refentry>