Add manpage for gpfs module. Thanks to Chetan Shringarpure

<chetan.sh@in.ibm.com>
(This used to be commit 649b6fffcb531fef3d0952a2f1a43acd8ec7f6e1)

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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_gpfs.8">
+
+<refmeta>
+       <refentrytitle>vfs_gpfs</refentrytitle>
+       <manvolnum>8</manvolnum>
+</refmeta>
+
+
+<refnamediv>
+       <refname>vfs_gpfs</refname>
+       <refpurpose>gpfs specific samba extensions like acls and prealloc</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+       <cmdsynopsis>
+               <command>vfs objects = gpfs</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>The <command>gpfs</command> VFS module is the home
+       for all gpfs extensions that Samba requires for proper integration 
+       with GPFS. For this it utilizes the gpl-ed library interfaces provided by
+       GPFS team.
+       </para>
+       
+       <para>Currently the gpfs vfs module provides extensions in following areas :
+       <itemizedlist>
+       <listitem><para>NFSv4 ACL Interfaces with configurable options for gpfs</para></listitem>
+       <listitem><para>Kernel oplock support on GPFS</para></listitem>
+       </itemizedlist>
+       </para>
+       
+       <para><command>NOTE:</command>This module follows the posix-acl behaviour
+       and hence allows permission stealing via chown. Samba might allow at a later 
+       point in time, to restrict the chown via this module as such restrictions
+       are the responsibility of the underlying filesystem than of Samba.
+       </para>
+
+       <para>This module is stackable.</para>
+
+</refsect1>
+
+
+<refsect1>
+       <title>OPTIONS</title>
+
+       <variablelist>
+
+               <varlistentry>
+               
+               <term>nfs4:mode = [ simple | special ]</term>
+               <listitem>
+               <para>
+               Enable/Disable substitution of special ids on GPFS. This parameter
+               should not affect the windows users in anyway. It only ensures that Samba
+               sets the special ids - OWNER@ and GROUP@ ( mappings to simple uids ) 
+               that are relevant to GPFS.
+               </para>
+
+               <para>The following MODE are understood by the module:</para>
+               <itemizedlist>
+               <listitem><para><command>simple(default)</command> - do not use special IDs in GPFS ACEs</para></listitem>
+               <listitem><para><command>special</command> - use special IDs in GPFS ACEs. </para> </listitem>
+               </itemizedlist>
+               </listitem>
+
+               </varlistentry>
+
+               <varlistentry>
+               <term>nfs4:acedup = [dontcare|reject|ignore|merge]</term>
+               <para>
+               This parameter configures how Samba handles duplicate ACEs encountered in GPFS ACLs.
+               GPFS allows/creates duplicate ACE for different bits for same ID.
+               </para>
+               
+               <para>Following is the behaviour of Samba for different values :</para>
+               <itemizedlist>
+               <listitem><para><command>dontcare (default)</command> - copy the ACEs as they come</para></listitem>
+               <listitem><para><command>reject</command> - stop operation and exit with error on ACL set op</para></listitem>
+               <listitem><para><command>ignore</command> - don't include the second matching ACE</para></listitem>
+               <listitem><para><command>merge</command> - OR 2 ace.flag fields and 2 ace.mask fields of the 2 duplicate ACEs into 1 ACE</para></listitem>
+               </itemizedlist>
+               </varlistentry>
+
+       </variablelist>
+</refsect1>
+
+<refsect1>
+       <title>EXAMPLES</title>
+
+       <para>A GPFS mount can be exported via Samba as follows :</para>
+
+<programlisting>
+        <smbconfsection name="[samba_gpfs_share]"/>
+       <smbconfoption name="path">/test/gpfs_mount</smbconfoption>
+       <smbconfoption name="nfs4: mode">special</smbconfoption>
+       <smbconfoption name="nfs4: acedup">merge</smbconfoption>
+</programlisting>
+</refsect1>
+
+<refsect1>
+       <title>CAVEATS</title>
+       <para>The gpfs gpl libraries are required by <command>gpfs</command> VFS 
+       module during both compilation and runtime.
+       Also this VFS module is tested to work on SLES 9/10 and RHEL 4.4
+       </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>
+
+       <para>The GPFS VFS module was created with contributions from
+       Volker Lendecke and the developers at IBM.
+       </para>
+
+       <para> This manpage was created by the IBM FSCC team </para>
+</refsect1>
+
+</refentry>