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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
SPDX-License-Identifier: LGPL-2.1+
This file is part of systemd.
Copyright 2017 Zbigniew Jędrzejewski-Szmek
-->
<refentry id="systemd-makefs@.service">
<refentryinfo>
<title>systemd-makefs@.service</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Zbigniew</firstname>
<surname>Jędrzejewski-Szmek</surname>
<email>zbyszek@in.waw.pl</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-makefs@.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-makefs@.service</refname>
<refname>systemd-makeswap@.service</refname>
<refname>systemd-growfs@.service</refname>
<refname>systemd-makefs</refname>
<refname>systemd-growfs</refname>
<refpurpose>Creating and growing file systems on demand</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-makefs@<replaceable>device</replaceable>.service</filename></para>
<para><filename>systemd-makeswap@<replaceable>device</replaceable>.service</filename></para>
<para><filename>systemd-growfs@<replaceable>mountpoint</replaceable>.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-makefs</filename></para>
<para><filename>/usr/lib/systemd/systemd-growfs</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-makefs@.service</filename>,
<filename>systemd-makeswap@.service</filename>, and
<filename>systemd-growfs@.service</filename> are used to implement the
<option>x-systemd.makefs</option> and <option>x-systemd.growfs</option> options
in <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
see <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
They are instantiated for each device for which the file system or swap structure
needs to be initalized, and for each mount point where the file system needs to
be grown.</para>
<para>These services are started at boot, either right before or right after the
mount point or swap device are used.</para>
<para><filename>systemd-makefs</filename> knows very little about specific file
systems and swap devices, and after checking that the block device does not already
contain a file system or other content, it will execute binaries specific to
each filesystem type (<filename>/sbin/mkfs.*</filename>).</para>
<para><filename>systemd-growfs</filename> knows very little about specific file
systems and swap devices, and will instruct the kernel to grow the mounted
filesystem to full size of the underlying block device. Nevertheless, it needs
to know the
<citerefentry project='man-pages'><refentrytitle>ioctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>
number specific to each file system, so only certain types are supported.
Currently:
<citerefentry project='man-pages'><refentrytitle>ext4</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
btrfs (see
<citerefentry project='man-pages'><refentrytitle>btrfs-man5</refentrytitle><manvolnum>5</manvolnum></citerefentry>),
<!-- yes, that's what the man page is called. -->
and dm-crypt partitions (see
<citerefentry project='die-net'><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>).
</para>
<para>If the creation of a file system or swap device fails, the mount point or
swap is failed too. If the growing of a file system fails, a warning is emitted.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mkfs.btrfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mkfs.cramfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mkfs.ext4</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mkfs.fat</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mkfs.hfsplus</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mkfs.minix</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mkfs.ntfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>mkfs.xfs</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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