source: postlfs/filesystems/btrfs-progs.xml@ 2b254ea9

<?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        "39c49d433c73152603d0eebbc4427cfa">
  <!ENTITY btrfs-progs-size          "2.1 MB">
  <!ENTITY btrfs-progs-buildsize     "92 MB (add 2.7 GB for tests)">
  <!ENTITY btrfs-progs-time          "0.2 SBU (add 44 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>

    &lfs10_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), and
      <xref linkend="reiserfs"/> (for tests)
    </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>

    <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 \
            --with-pkgconfigdir=/usr/lib/pkgconfig &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="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/misc-tests/025-zstd-compression/test.sh{,.broken} &amp;&amp;</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    <!-- 43 tests  6m14s -->
   ./mkfs-tests.sh    <!-- 20 tests  2m48s -->
   ./cli-tests.sh     <!-- 12 tests  0m51s -->
   ./convert-tests.sh <!-- 16 tests 13m36s -->
   ./misc-tests.sh    <!-- 38 tests  3m18s -->
   ./fuzz-tests.sh    <!--  8 tests  1m11s -->
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>