Add docs for readahead vfs module.

Jeremy.

diff --git a/docs/manpages-3/vfs_readahead.8.xml b/docs/manpages-3/vfs_readahead.8.xml
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+<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
+<refentry id="vfs_readahead.8">
+
+<refmeta>
+       <refentrytitle>vfs_readahead</refentrytitle>
+       <manvolnum>8</manvolnum>
+</refmeta>
+
+
+<refnamediv>
+       <refname>vfs_readahead</refname>
+       <refpurpose>pre-load the kernel buffer cache</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+       <cmdsynopsis>
+               <command>vfs objects = readahead</command>
+       </cmdsynopsis>
+</refsynopsisdiv>
+
+<refsect1>
+       <title>DESCRIPTION</title>
+
+       <para>This VFS module is part of the
+       <citerefentry><refentrytitle>samba</refentrytitle>
+       <manvolnum>7</manvolnum></citerefentry> suite.</para>
+
+       <para>This <command>vfs_readahead</command> VFS module detects
+       read requests at multiples of a given offset (hex 0x80000 by
+       default) and then tells the kernel via either the readahead
+       system call (on Linux) or the posix_fadvise system call to
+       pre-fetch this data into the buffer cache.</para>
+
+       <para>This module is useful for Windows Vista clients reading
+       data using the Windows Explorer program, which asynchronously
+       does multiple file read requests at offset boundaries of 0x80000
+       bytes.</para>
+
+       <para>The offset multiple used is given by the readahead:offset
+       option, which defaults to 0x80000.</para>
+
+       <para>The size of the disk read operations performed
+       by <command>vfs_readahead</command> is determined by the
+       readahead:length option. By default this is set to the
+       same value as the readahead:offset option and if not
+       set explicitly will use the current value of
+       readahead:offset.</para>
+
+       <para>This module is stackable.</para>
+</refsect1>
+
+<refsect1>
+       <title>OPTIONS</title>
+
+       <variablelist>
+
+               <varlistentry>
+               <term>readahead:offset = BYTES</term>
+               <listitem>
+               <para>The offset multiple that causes readahead to be
+               requested of the kernel buffer cache.</para>
+               </listitem>
+               </varlistentry>
+
+               <varlistentry>
+               <term>readahead:length = BYTES</term>
+               <listitem>
+               <para>The number of bytes requested to be
+               read into the kernel buffer cache on each
+               readahead call.</para>
+               </listitem>
+               </varlistentry>
+
+               <para>The following suffixes may be applied to BYTES:</para>
+               <itemizedlist>
+               <listitem><para><command>K</command> - BYTES is a number of kilobytes</para></listitem>
+               <listitem><para><command>M</command> - BYTES is a number of megabytes</para></listitem>
+               <listitem><para><command>G</command> - BYTES is a number of gigabytes</para></listitem>
+               </itemizedlist>
+
+
+       </variablelist>
+</refsect1>
+
+<refsect1>
+       <title>EXAMPLES</title>
+
+<programlisting>
+       <smbconfsection name="[hypothetical]"/>
+       <smbconfoption name="vfs objects">readahead</smbconfoption>
+       <smbconfoption name="readahead:length">1M</smbconfoption>
+</programlisting>
+
+</refsect1>
+
+<refsect1>
+       <title>VERSION</title>
+       <para>This man page is correct for version 3.0.25 of the Samba suite.
+       </para>
+</refsect1>
+
+<refsect1>
+       <title>AUTHOR</title>
+
+       <para>The original Samba software and related utilities
+       were created by Andrew Tridgell. Samba is now developed
+       by the Samba Team as an Open Source project similar
+       to the way the Linux kernel is developed.</para>
+
+</refsect1>
+
+</refentry>