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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 -->
<refentry id="systemd-makefs@.service">
<refentryinfo>
<title>systemd-makefs@.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-makefs@.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-makefs@.service</refname>
<refname>systemd-mkswap@.service</refname>
<refname>systemd-growfs@.service</refname>
<refname>systemd-growfs-root.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-mkswap@<replaceable>device</replaceable>.service</filename></para>
<para><filename>systemd-growfs@<replaceable>mountpoint</replaceable>.service</filename></para>
<para><filename>systemd-growfs-root.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-mkswap@.service</filename>,
<filename>systemd-growfs@.service</filename>, and
<filename>systemd-growfs-root.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 initialized, 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.<replaceable>type</replaceable></filename>
or <filename>/sbin/mkswap</filename>). For certain file system types (currently
ext2/ext3/<citerefentry project='man-pages'><refentrytitle>ext4</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-man5.html'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>xfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
f2fs, vfat) and for swap devices, it will configure reasonable defaults and set
the file system label and UUID based on the device name.</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>,
<citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/btrfs-man5.html'>btrfs</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>xfs</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><refentrytitle>systemd-repart</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='url'><refentrytitle url='https://btrfs.readthedocs.io/en/latest/mkfs.btrfs.html'>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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