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Herwig Bauernfeind
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    1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 10. VFS Modules</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.1"><link rel="start" href="index.html" title="SAMBA Developers Guide"><link rel="up" href="pt03.html" title="Part III. Samba Subsystems"><link rel="prev" href="rpc-plugin.html" title="Chapter 9. RPC Pluggable Modules"><link rel="next" href="parsing.html" title="Chapter 11. The smb.conf file"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 10. VFS Modules</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="rpc-plugin.html">Prev</a> </td><th width="60%" align="center">Part III. Samba Subsystems</th><td width="20%" align="right"> <a accesskey="n" href="parsing.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="vfs"></a>Chapter 10. VFS Modules</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Alexander</span> <span class="surname">Bokovoy</span></h3><div class="affiliation"><div class="address"><p><code class="email">&lt;<a class="email" href="mailto:ab@samba.org">ab@samba.org</a>&gt;</code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Stefan</span> <span class="surname">Metzmacher</span></h3><div class="affiliation"><div class="address"><p><code class="email">&lt;<a class="email" href="mailto:metze@samba.org">metze@samba.org</a>&gt;</code></p></div></div></div></div><div><p class="pubdate"> 27 May 2003 </p></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="vfs.html#id2551561">The Samba (Posix) VFS layer</a></span></dt><dd><dl><dt><span class="sect2"><a href="vfs.html#id2551603">The general interface</a></span></dt><dt><span class="sect2"><a href="vfs.html#id2551935">Possible VFS operation layers</a></span></dt></dl></dd><dt><span class="sect1"><a href="vfs.html#id2551996">The Interaction between the Samba VFS subsystem and the modules</a></span></dt><dd><dl><dt><span class="sect2"><a href="vfs.html#id2552003">Initialization and registration</a></span></dt><dt><span class="sect2"><a href="vfs.html#id2552153">How the Modules handle per connection data</a></span></dt></dl></dd><dt><span class="sect1"><a href="vfs.html#id2552357">Upgrading to the New VFS Interface</a></span></dt><dd><dl><dt><span class="sect2"><a href="vfs.html#id2552363">Upgrading from 2.2.* and 3.0alpha modules</a></span></dt></dl></dd><dt><span class="sect1"><a href="vfs.html#id2552781">Some Notes</a></span></dt><dd><dl><dt><span class="sect2"><a href="vfs.html#id2552787">Implement TRANSPARENT functions</a></span></dt><dt><span class="sect2"><a href="vfs.html#id2552806">Implement OPAQUE functions</a></span></dt></dl></dd></dl></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2551561"></a>The Samba (Posix) VFS layer</h2></div></div></div><p>While most of Samba deployments are done using POSIX-compatible
     1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 10. VFS Modules</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.1"><link rel="start" href="index.html" title="SAMBA Developers Guide"><link rel="up" href="pt03.html" title="Part III. Samba Subsystems"><link rel="prev" href="rpc-plugin.html" title="Chapter 9. RPC Pluggable Modules"><link rel="next" href="parsing.html" title="Chapter 11. The smb.conf file"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 10. VFS Modules</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="rpc-plugin.html">Prev</a> </td><th width="60%" align="center">Part III. Samba Subsystems</th><td width="20%" align="right"> <a accesskey="n" href="parsing.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="vfs"></a>Chapter 10. VFS Modules</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Alexander</span> <span class="surname">Bokovoy</span></h3><div class="affiliation"><div class="address"><p><code class="email">&lt;<a class="email" href="mailto:ab@samba.org">ab@samba.org</a>&gt;</code></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Stefan</span> <span class="surname">Metzmacher</span></h3><div class="affiliation"><div class="address"><p><code class="email">&lt;<a class="email" href="mailto:metze@samba.org">metze@samba.org</a>&gt;</code></p></div></div></div></div><div><p class="pubdate"> 27 May 2003 </p></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="vfs.html#id2551565">The Samba (Posix) VFS layer</a></span></dt><dd><dl><dt><span class="sect2"><a href="vfs.html#id2551607">The general interface</a></span></dt><dt><span class="sect2"><a href="vfs.html#id2551939">Possible VFS operation layers</a></span></dt></dl></dd><dt><span class="sect1"><a href="vfs.html#id2552000">The Interaction between the Samba VFS subsystem and the modules</a></span></dt><dd><dl><dt><span class="sect2"><a href="vfs.html#id2552007">Initialization and registration</a></span></dt><dt><span class="sect2"><a href="vfs.html#id2552157">How the Modules handle per connection data</a></span></dt></dl></dd><dt><span class="sect1"><a href="vfs.html#id2552362">Upgrading to the New VFS Interface</a></span></dt><dd><dl><dt><span class="sect2"><a href="vfs.html#id2552368">Upgrading from 2.2.* and 3.0alpha modules</a></span></dt></dl></dd><dt><span class="sect1"><a href="vfs.html#id2552785">Some Notes</a></span></dt><dd><dl><dt><span class="sect2"><a href="vfs.html#id2552791">Implement TRANSPARENT functions</a></span></dt><dt><span class="sect2"><a href="vfs.html#id2552811">Implement OPAQUE functions</a></span></dt></dl></dd></dl></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2551565"></a>The Samba (Posix) VFS layer</h2></div></div></div><p>While most of Samba deployments are done using POSIX-compatible
    22operating systems, there is clearly more to a file system than what is
    33required by POSIX when it comes to adopting semantics of NT file
    … …  
    2525to load several instances of the same VFS module with different
    2626parameters.
    27 </p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2551603"></a>The general interface</h3></div></div></div><p>A VFS module has three major components:
     27</p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2551607"></a>The general interface</h3></div></div></div><p>A VFS module has three major components:
    2828</p><div class="itemizedlist"><ul type="disc"><li><span class="emphasis"><em>An initialization function</em></span> that is
    2929called during the module load to register implemented
    … …  
    188188
    189189...
    190 </pre></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2551935"></a>Possible VFS operation layers</h3></div></div></div><p>
     190</pre></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2551939"></a>Possible VFS operation layers</h3></div></div></div><p>
    191191These values are used by the VFS subsystem when building the conn-&gt;vfs
    192192and conn-&gt;vfs_opaque structs for a connection with multiple VFS modules.
    … …  
    217217                                        /*   file activity like logging to files _inside_ samba VFS */
    218218} vfs_op_layer;
    219 </pre></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2551996"></a>The Interaction between the Samba VFS subsystem and the modules</h2></div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552003"></a>Initialization and registration</h3></div></div></div><p>
     219</pre></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2552000"></a>The Interaction between the Samba VFS subsystem and the modules</h2></div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552007"></a>Initialization and registration</h3></div></div></div><p>
    220220As each Samba module a VFS module should have a
    221221</p><pre class="programlisting">NTSTATUS vfs_example_init(void);</pre><p> function if it's staticly linked to samba or
    … …  
    257257        return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "example", example_op_tuples);
    258258}
    259 </pre></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552153"></a>How the Modules handle per connection data</h3></div></div></div><p>Each VFS function has as first parameter a pointer to the modules vfs_handle_struct.
     259</pre></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552157"></a>How the Modules handle per connection data</h3></div></div></div><p>Each VFS function has as first parameter a pointer to the modules vfs_handle_struct.
    260260</p><pre class="programlisting">
    261261typedef struct vfs_handle_struct {
    … …  
    358358         (tofd), (fsp), (fromfd), (header), (offset), (count)))
    359359...
    360 </pre></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2552357"></a>Upgrading to the New VFS Interface</h2></div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552363"></a>Upgrading from 2.2.* and 3.0alpha modules</h3></div></div></div><div class="orderedlist"><ol type="1"><li><p>
     360</pre></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2552362"></a>Upgrading to the New VFS Interface</h2></div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552368"></a>Upgrading from 2.2.* and 3.0alpha modules</h3></div></div></div><div class="orderedlist"><ol type="1"><li><p>
    361361Add "vfs_handle_struct *handle, " as first parameter to all vfs operation functions.
    362362e.g. example_connect(connection_struct *conn, const char *service, const char *user);
    … …  
    621621Compiling &amp; Testing...
    622622</p><table class="simplelist" border="0" summary="Simple list"><tr><td><strong class="userinput"><code>./configure <code class="option">--enable-developer</code></code></strong> ...</td></tr><tr><td><strong class="userinput"><code>make</code></strong></td></tr><tr><td>Try to fix all compiler warnings</td></tr><tr><td><strong class="userinput"><code>make</code></strong></td></tr><tr><td>Testing, Testing, Testing ...</td></tr></table><p>
    623 </p></li></ol></div></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2552781"></a>Some Notes</h2></div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552787"></a>Implement TRANSPARENT functions</h3></div></div></div><p>
     623</p></li></ol></div></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2552785"></a>Some Notes</h2></div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552791"></a>Implement TRANSPARENT functions</h3></div></div></div><p>
    624624Avoid writing functions like this:
    625625
    … …  
    632632
    633633Overload only the functions you really need to!
    634 </p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552806"></a>Implement OPAQUE functions</h3></div></div></div><p>
     634</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2552811"></a>Implement OPAQUE functions</h3></div></div></div><p>
    635635If you want to just implement a better version of a
    636636default samba opaque function
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