man/systemd-makefs@.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/4.5/docbookx.dtd">
   5 <!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
   6 <refentry id="systemd-makefs_.service">
   7
   8   <refentryinfo>
   9     <title>systemd-makefs@.service</title>
  10     <productname>systemd</productname>
  11   </refentryinfo>
  12
  13   <refmeta>
  14     <refentrytitle>systemd-makefs@.service</refentrytitle>
  15     <manvolnum>8</manvolnum>
  16   </refmeta>
  17
  18   <refnamediv>
  19     <refname>systemd-makefs@.service</refname>
  20     <refname>systemd-mkswap@.service</refname>
  21     <refname>systemd-growfs@.service</refname>
  22     <refname>systemd-growfs-root.service</refname>
  23     <refname>systemd-makefs</refname>
  24     <refname>systemd-growfs</refname>
  25     <refpurpose>Creating and growing file systems on demand</refpurpose>
  26   </refnamediv>
  27
  28   <refsynopsisdiv>
  29     <para><filename>systemd-makefs@<replaceable>device</replaceable>.service</filename></para>
  30     <para><filename>systemd-mkswap@<replaceable>device</replaceable>.service</filename></para>
  31     <para><filename>systemd-growfs@<replaceable>mountpoint</replaceable>.service</filename></para>
  32     <para><filename>systemd-growfs-root.service</filename></para>
  33     <para><filename>/usr/lib/systemd/systemd-makefs</filename></para>
  34     <para><filename>/usr/lib/systemd/systemd-growfs</filename></para>
  35   </refsynopsisdiv>
  36
  37   <refsect1>
  38     <title>Description</title>
  39
  40     <para><filename>systemd-makefs@.service</filename>,
  41     <filename>systemd-mkswap@.service</filename>,
  42     <filename>systemd-growfs@.service</filename>, and
  43     <filename>systemd-growfs-root.service</filename> are used to implement the
  44     <option>x-systemd.makefs</option> and <option>x-systemd.growfs</option> options
  45     in <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  46     see <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
  47     They are instantiated for each device for which the file system or swap structure
  48     needs to be initialized, and for each mount point where the file system needs to
  49     be grown.</para>
  50
  51     <para>These services are started at boot, either right before or right after the
  52     mount point or swap device are used.</para>
  53
  54     <para><filename>systemd-makefs</filename> knows very little about specific file
  55     systems and swap devices, and after checking that the block device does not already
  56     contain a file system or other content, it will execute binaries specific to
  57     each filesystem type (<filename>/sbin/mkfs.<replaceable>type</replaceable></filename>
  58     or <filename>/sbin/mkswap</filename>). For certain file system types (currently
  59     ext2/ext3/<citerefentry project='man-pages'><refentrytitle>ext4</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  60     <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-man5.html'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  61     <citerefentry project='man-pages'><refentrytitle>xfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  62     f2fs, vfat) and for swap devices, it will configure reasonable defaults and set
  63     the file system label and UUID based on the device name.</para>
  64
  65     <para><filename>systemd-growfs</filename> knows very little about specific file
  66     systems and swap devices, and will instruct the kernel to grow the mounted
  67     filesystem to full size of the underlying block device. Nevertheless, it needs
  68     to know the
  69     <citerefentry project='man-pages'><refentrytitle>ioctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
  70     number specific to each file system, so only certain types are supported.
  71     Currently:
  72     <citerefentry project='man-pages'><refentrytitle>ext4</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  73     <citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-man5.html'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  74     <citerefentry project='man-pages'><refentrytitle>xfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  75     <!-- yes, that's what the man page is called. -->
  76     and dm-crypt partitions (see
  77     <citerefentry project='die-net'><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>).
  78     </para>
  79
  80     <para>If the creation of a file system or swap device fails, the mount point or
  81     swap is failed too. If the growing of a file system fails, a warning is emitted.
  82     </para>
  83   </refsect1>
  84
  85   <refsect1>
  86     <title>See Also</title>
  87     <para><simplelist type="inline">
  88       <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
  89       <member><citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  90       <member><citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  91       <member><citerefentry><refentrytitle>systemd-repart</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  92       <member><citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/mkfs.btrfs.html'>mkfs.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  93       <member><citerefentry project='man-pages'><refentrytitle>mkfs.cramfs</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  94       <member><citerefentry project='man-pages'><refentrytitle>mkfs.ext4</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  95       <member><citerefentry project='man-pages'><refentrytitle>mkfs.fat</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  96       <member><citerefentry project='man-pages'><refentrytitle>mkfs.hfsplus</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  97       <member><citerefentry project='man-pages'><refentrytitle>mkfs.minix</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  98       <member><citerefentry project='man-pages'><refentrytitle>mkfs.ntfs</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
  99       <member><citerefentry project='man-pages'><refentrytitle>mkfs.xfs</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
 100     </simplelist></para>
 101   </refsect1>
 102
 103 </refentry>