man/systemd-fsck__at__.service.xml

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<refentry id="systemd-fsck@.service">

  <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-usr.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>systemd-fsck-usr.service</filename></para>
    <para><filename>/usr/lib/systemd/systemd-fsck</filename></para>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><filename>systemd-fsck@.service</filename>, <filename>systemd-fsck-root.service</filename>, and
    <filename>systemd-fsck-usr.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> and <filename>systemd-fsck-usr.service</filename> are
    responsible for file system checks on the root and /usr file system, respectively, 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>

    <para>These services are started at boot if
    <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
    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
    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> and <filename>systemd-fsck-usr.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>
  </refsect1>

  <refsect1>
    <title>Kernel Command Line</title>

    <para><filename>systemd-fsck</filename> understands these kernel
    command line parameters:</para>

    <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
        mode of operation. The default is <literal>preen</literal>,
        and will automatically repair problems that can be safely
        fixed. <literal>yes</literal> will answer yes to all
        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>,
      <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>
    </para>
  </refsect1>

</refentry>