glfs/postlfs/filesystems/btrfs-progs.xml

<?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        "70c55c5c403251f5260285675cf35c1a">
  <!ENTITY btrfs-progs-size          "2.0 MB">
  <!ENTITY btrfs-progs-buildsize     "55 MB (add 29 MB for tests)">
  <!ENTITY btrfs-progs-time          "0.2 SBU (add 13 SBU for tests)">
]>

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

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <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>

    &lfs90_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">Btrfs-progs Dependencies</bridgehead>

    <bridgehead renderas="sect4">Required</bridgehead>
    <para role="required">
      <xref linkend="lzo"/> 
    </para>

    <bridgehead renderas="sect4">Recommended</bridgehead>
    <para role="recommended">
      <xref linkend="asciidoc"/> 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="python2"/> (python bindings),
      <xref linkend="reiserfs"/> (for tests), and
      <ulink url='https://github.com/facebook/zstd/releases/'>zstd</ulink> (for tests)
    </para>

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

    <note><para>CONFIG_BTRFS_FS_POSIX_ACL and 
    CONFIG_REISERFS_FS_XATTR are required for some tests.
    Other Btrfs options in the kernel are optional.</para></note>

    <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  \
            --bindir=/bin  \
            --libdir=/lib  \
            --disable-zstd &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 6 instructions after
    installing <xref linkend="pcre"/>.</para></note>

    <para>Before running tests, build a support program and 
    disable several that fail:</para>

<screen remap="test"><userinput>make fssum &amp;&amp;

sed -i '/found/s/^/: #/' tests/convert-tests.sh &amp;&amp;

mv tests/convert-tests/010-reiserfs-basic/test.sh{,.broken}                 &amp;&amp;
mv tests/convert-tests/011-reiserfs-delete-all-rollback/test.sh{,.broken}   &amp;&amp;
mv tests/convert-tests/012-reiserfs-large-hole-extent/test.sh{,.broken}     &amp;&amp;
mv tests/convert-tests/013-reiserfs-common-inode-flags/test.sh{,.broken}    &amp;&amp;
mv tests/convert-tests/014-reiserfs-tail-handling/test.sh{,.broken}         &amp;&amp;
mv tests/misc-tests/025-zstd-compression/test.sh{,.broken}</userinput></screen> 

    <para>To test the results, issue (as the <systemitem
    class="username">root</systemitem> user): </para>

<screen role="root" remap="test"><userinput>pushd tests
   ./fsck-tests.sh
   ./mkfs-tests.sh
   ./cli-tests.sh
   ./convert-tests.sh
   ./misc-tests.sh
   ./fuzz-tests.sh
popd</userinput></screen>

    <para>Install the package as the <systemitem
    class="username">root</systemitem> user:</para>

<screen role="root"><userinput>make install &amp;&amp;

ln -sfv ../../lib/$(readlink /lib/libbtrfs.so) /usr/lib/libbtrfs.so &amp;&amp;
ln -sfv ../../lib/$(readlink /lib/libbtrfsutil.so) /usr/lib/libbtrfsutil.so &amp;&amp;
rm -fv /lib/libbtrfs.{a,so} /lib/libbtrfsutil.{a,so} &amp;&amp;
mv -v /bin/{mkfs,fsck}.btrfs /sbin</userinput></screen>

  </sect2>

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

    <para><option>--disable-documentation</option>: This option
    is needed if the recommended dependencies are not installed.</para>

    <para><command>mv tests/{cli,convert,misc,fuzz}-tests/ ...</command>: Disables
    tests that fail and prevent tests from completing.</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="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 filesystem to btrfs.
          </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>