source: postlfs/filesystems/btrfs-progs.xml@ eeb1cfd1

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY btrfs-progs-download-http "&kernel-dl;/linux/kernel/people/kdave/btrfs-progs/btrfs-progs-v&btrfs-progs-version;.tar.xz">
  <!ENTITY btrfs-progs-download-ftp  " ">
  <!ENTITY btrfs-progs-md5sum        "323330914e19c3ccc401792878979858">
  <!ENTITY btrfs-progs-size          "2.4 MB">
  <!ENTITY btrfs-progs-buildsize     "59 MB (transient files created during tests need up to 10 GB)">
  <!ENTITY btrfs-progs-time          "0.2 SBU (add 5.8 SBU for tests, up to 80 SBU on slow disks if reiserfsprogs is installed)">
]>

<sect1 id="btrfs-progs" xreflabel="btrfs-progs-&btrfs-progs-version;">
  <?dbhtml filename="btrfs-progs.html"?>


  <title>btrfs-progs-&btrfs-progs-version;</title>

  <indexterm zone="btrfs-progs">
    <primary sortas="a-btrfs-progs">btrfs-progs</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to btrfs-progs</title>

    <para>
      The <application>btrfs-progs</application> package contains
      administration and debugging tools for the B-tree file system (btrfs).
    </para>

    &lfs113_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&btrfs-progs-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url="&btrfs-progs-download-ftp;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &btrfs-progs-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &btrfs-progs-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &btrfs-progs-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &btrfs-progs-time;
        </para>
      </listitem>
    </itemizedlist>
<!--
<bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Required patch if building with linux kernel headers version
          before 5.12:
          <ulink url="&patch-root;/btrfs-progs-&btrfs-progs-version;-headers_fix-1.patch"/>
        </para>
      </listitem>
    </itemizedlist>
-->
    <bridgehead renderas="sect3">Btrfs-progs Dependencies</bridgehead>

    <bridgehead renderas="sect4">Required</bridgehead>
    <para role="required">
      <xref linkend="lzo"/>
    </para>
    <!-- In v6.2.1 (and maybe previous), sphinx is required for the doc
    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended">
      <xref linkend="asciidoc"/> (or <xref role="nodep" linkend="asciidoctor"/>)
      and <xref linkend="xmlto"/> (both required to generate man pages)
    </para>
    -->
    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="lvm2"/> (<command>dmsetup</command> is used in tests),
      <xref linkend="reiserfs"/> (for tests), and
      <xref linkend="sphinx"/> (required to build documentation)

    </para>

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/btrfs-progs"/></para>

  </sect2>

  <sect2 role="kernel" id="btrfs-progs-kernel">
    <title>Kernel Configuration</title>

    <para>
      Enable the following option in the kernel configuration
      and recompile the kernel:
    </para>

<screen><literal>File systems ---&gt;
  &lt;*/M&gt; Btrfs filesystem support [CONFIG_BTRFS_FS]</literal></screen>

    <para>
      In addition to the above and to the options required for
      <xref linkend="lvm2"/> and <xref linkend="reiserfs"/>, the following
      options must be enabled for running tests:
    </para>

<screen><literal>File systems  ---&gt;
  [*]   Btrfs POSIX Access Control Lists      [CONFIG_BTRFS_FS_POSIX_ACL]
  [*]   ReiserFS extended attributes          [CONFIG_REISERFS_FS_XATTR]
  [*]     ReiserFS POSIX Access Control Lists [CONFIG_REISERFS_FS_POSIX_ACL]</literal></screen>

    <indexterm zone="btrfs-progs btrfs-progs-kernel">
      <primary sortas="d-btrfs-progs">BTRFS Programs</primary>
    </indexterm>

  </sect2>

  <sect2 role="installation">
    <title>Installation of btrfs-progs</title>

    <para>
      Install <application>btrfs-progs</application> by running the following
      commands:
    </para>

<screen><userinput>./configure --prefix=/usr           \
            --disable-static        \
            --disable-documentation &amp;&amp;
make</userinput></screen>

    <note>
      <para>
        Some tests require grep built with perl regular expressions. To
        obtain this, rebuild grep with the LFS Chapter 8 instructions after
        installing <xref linkend="pcre2"/>.
      </para>
    </note>
<!-- Keeping this for now, but it seems that calling "make test" is
     simpler and does the same thing -->
    <para>
      Before running tests, build a support program:
    </para>

<screen remap="test"><userinput>make fssum</userinput></screen>

    <para>
      To test the results, issue (as the &root; user):
    </para>

<screen role="root" remap="test"><userinput>pushd tests
   ./fsck-tests.sh
   ./mkfs-tests.sh
   ./cli-tests.sh
   sed 's/,orphan_file//' /etc/mke2fs.conf >./custom_mke2fs.conf &amp;&amp;
   export MKE2FS_CONFIG=$PWD/custom_mke2fs.conf                  &amp;&amp;
   ./convert-tests.sh
   unset MKE2FS_CONFIG &amp;&amp; rm custom_mke2fs.conf
   ./misc-tests.sh
   ./fuzz-tests.sh
popd</userinput></screen>

<!-- Template for failed test removal:
    <para>
      To test the results, first disable one test that fails and prevents
      the other ones to run:
    </para>

<screen remap="test"><userinput>mv tests/fsck-tests/012-leaf-corruption/test.sh{,.broken}</userinput></screen>
Substitute your test failure with the one above.
    <para>
      To test the results, run (as the
      <systemitem class="username">root</systemitem> user):
    </para>

<screen role="root" remap="test"><userinput>make -j1 -k test</userinput></screen>
-->
    <note>
      <para>
        If the above mentioned kernel options are not enabled, some tests
        fail, and prevent all the remaining tests to run because the test
        disk image is not cleanly unmounted.
      </para>
    </note>

    <para>
      The mkfs test 025-zoned-parallel is known to fail.
    </para>

    <para>
      Install the package as the &root; user:
    </para>

<screen role="root"><userinput>make install</userinput></screen>

    <para>
      If you have passed <parameter>--disable-documentation</parameter> to
      <command>configure</command> and you need the manual pages, install them
      by running, as the &root; user:
    </para>

<screen role="root"><userinput>for i in 5 8; do
   install Documentation/*.$i /usr/share/man/man$i
done</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
      href="../../xincludes/static-libraries.xml"/>

    <para>
      <parameter>--disable-documentation</parameter>: This switch
      disables rebuilding the manual pages, because it requires
      <xref linkend="sphinx"/>.
    </para>
    <para>
      <command>sed 's/,orphan_file//" ...</command>: In this version of
      <application>btrfs-progs</application>, the
      <command>btrfs-convert</command> program produces a btrfs filesystem
      containing errors if converting from an ext4 filesystem created
      with the <quote>orphan_file</quote> feature. This command creates
      a custom configuration file that prevents creating a filesystem
      with this feature.
    </para>
    <!--
    <para>
      <command>ln -s ... /usr/lib/libbtrfs.so</command>: Creates a
      symbolic link in the directory where it is expected.
    </para>

    <para>
      <command>rm /lib/libbtrfs.{a,so}</command>: Removes unneeded
      library entries.
    </para>
-->
  </sect2>

  <sect2 role="using" id="using-btrfs-convert">
    <title>Using the btrfs-convert Program</title>

    <para>
      This version of <application>btrfs-progs</application> does not convert
      correctly ext4 filesystems to btrfs if the ext4
      <option>orphan_file</option> feature is turned on. If you happen to
      convert such a filesystem, you need to first run:
    </para>

<screen role="nodump"><userinput>tune2fs -O ^orphan_file <replaceable>/dev/sdxx</replaceable></userinput></screen>

    <para>
      where <filename>/dev/sdxx</filename> is the partition of the filesystem
      you want to convert.
    </para>
  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>
          btrfs,
          btrfs-convert,
          btrfs-find-root,
          btrfs-image,
          btrfs-map-logical,
          btrfs-select-super,
          btrfsck (link to btrfs),
          btrfstune,
          fsck.btrfs, and
          mkfs.btrfs
        </seg>

        <seg>
          libbtrfs.so and
          libbtrfsutil.so
        </seg>

        <seg>/usr/include/btrfs</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="btrfs-prog">
        <term><command>btrfs</command></term>
        <listitem>
          <para>
            is the main interface into btrfs filesystem operations
          </para>
          <indexterm zone="btrfs-progs btrfs-prog">
            <primary sortas="b-btrfs">btrfs</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="btrfs-convert">
        <term><command>btrfs-convert</command></term>
        <listitem>
          <para>
            converts from an ext2/3/4 or reiserfs filesystem to btrfs (see
            <xref linkend="using-btrfs-convert"/> above)
          </para>
          <indexterm zone="btrfs-progs btrfs-convert">
            <primary sortas="b-btrfs-convert">btrfs-convert</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="btrfs-find-root">
        <term><command>btrfs-find-root</command></term>
        <listitem>
          <para>
            is a filter to find btrfs root
          </para>
          <indexterm zone="btrfs-progs btrfs-find-root">
            <primary sortas="b-btrfs-find-root">btrfs-find-root</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="btrfs-map-logical">
        <term><command>btrfs-map-logical</command></term>
        <listitem>
          <para>
            maps btrfs logical extent to physical extent
          </para>
          <indexterm zone="btrfs-progs btrfs-map-logical">
            <primary sortas="b-btrfs-map-logical">btrfs-map-logical</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="btrfs-select-super">
        <term><command>btrfs-select-super</command></term>
        <listitem>
          <para>
            overwrites the primary superblock with a backup copy
          </para>
          <indexterm zone="btrfs-progs btrfs-select-super">
            <primary sortas="b-btrfs-select-super">btrfs-select-super</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="btrfstune">
        <term><command>btrfstune</command></term>
        <listitem>
          <para>
            tunes various filesystem parameters
          </para>
          <indexterm zone="btrfs-progs btrfstune">
            <primary sortas="b-btrfstune">btrfstune</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="fsck.btrfs">
        <term><command>fsck.btrfs</command></term>
        <listitem>
          <para>
            does nothing, but is present for consistency with fstab
          </para>
          <indexterm zone="btrfs-progs fsck.btrfs">
            <primary sortas="b-fsck.btrfs">fsck.btrfs</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="mkfs.btrfs">
        <term><command>mkfs.btrfs</command></term>
        <listitem>
          <para>
            creates a btrfs file system
          </para>
          <indexterm zone="btrfs-progs mkfs.btrfs">
            <primary sortas="b-mkfs.btrfs">mkfs.btrfs</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>