Document cacheprime VFS module.

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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="smb-vfs-cacheprime.8">
+
+<refmeta>
+       <refentrytitle>smb-vfs-cacheprime</refentrytitle>
+       <manvolnum>8</manvolnum>
+</refmeta>
+
+
+<refnamediv>
+       <refname>cacheprime</refname>
+       <refpurpose>prime the kernel file data cache</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+       <cmdsynopsis>
+               <command>vfs objects = cacheprime</command>
+       </cmdsynopsis>
+</refsynopsisdiv>
+
+<refsect1>
+       <title>DESCRIPTION</title>
+
+       <para>This module is part of the <citerefentry><refentrytitle>samba</refentrytitle>
+       <manvolnum>7</manvolnum></citerefentry> suite.</para>
+
+       <para>The <command>cacheprime</command> VFS module reads chunks
+       of file data near the range requested by clients in order to
+       make sure the data is present in the kernel file data cache at
+       the time when it is actually requested by clients. </para>
+
+       <para>The size of the disk read operations performed
+       by <command>cacheprime</command> is determined by the
+       cacheprime:rsize option. All disk read operations are aligned
+       on boundaries that are a multiple of this size. Each range of
+       the file data is primed at most once during the time the client
+       has the file open. </para>
+
+       <para>This module is stackable.</para>
+</refsect1>
+
+<refsect1>
+       <title>OPTIONS</title>
+
+       <variablelist>
+
+               <varlistentry>
+               <term>cacheprime:rsize = BYTES</term>
+               <listitem>
+               <para>The number of bytes with which to prime
+               the kernel data cache.
+               
+               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>
+
+               </listitem>
+               </varlistentry>
+
+       </variablelist>
+</refsect1>
+
+<refsect1>
+       <title>EXAMPLES</title>
+
+       <para>For a hypothetical disk array, it is necessary to ensure
+       that all read operations are of size 1 megabyte (1048576 bytes),
+       and aligned on 1 megabyte boundaries:
+       </para>
+<programlisting>
+       <smbconfsection name="[hypothetical]"/>
+       <smbconfoption name="vfs objects">cacheprime</smbconfoption>
+       <smbconfoption name="cacheprime:rsize">1M</smbconfoption>
+</programlisting>
+
+</refsect1>
+
+<refsect1>
+       <title>CAVEATS</title>
+       <para><command>cacheprime</command> is not a a substitute for
+       a general-purpose readahead mechanism. It is intended for use
+       only in very specific environments where disk operations must
+       be aligned and sized to known values (as much as that is possible).
+       </para>
+</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>