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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_fileid.8">
<refmeta>
<refentrytitle>vfs_fileid</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="source">Samba</refmiscinfo>
<refmiscinfo class="manual">System Administration tools</refmiscinfo>
<refmiscinfo class="version">&doc.version;</refmiscinfo>
</refmeta>
<refnamediv>
<refname>vfs_fileid</refname>
<refpurpose>Generates file_id structs with unique device id values for
cluster setups</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>vfs objects = fileid</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>Samba uses file_id structs to uniquely identify files
for locking purpose. By default the file_id contains the device
and inode number returned by the <command>stat()</command> system call.
As the file_id is a unique identifier of a file, it must be the same
on all nodes in a cluster setup. This module overloads the
<command>SMB_VFS_FILE_ID_CREATE()</command> operation and
generates the device number based on the configured algorithm
(see the "fileid:algorithm" option).
</para>
<para>When using the fsname or fsid algorithm a
<command>stat()</command> and <command>statfs()</command> call is
required for all mounted file systems to generate the file_id. If e.g.
an NFS file system is unresponsive such a call might block and the smbd
process will become unresponsive. Use the "fileid:fstype deny",
"fileid:fstype allow", "fileid:mntdir deny", or "fileid:mntdir allow"
options to ignore potentially unresponsive file systems.
</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>fileid:algorithm = ALGORITHM</term>
<listitem>
<para>Available algorithms are <command>fsname</command>
and <command>fsid</command>. The default value is
<command>fsname</command>.
</para>
<para>The <command>fsname</command> algorithm generates
device id by hashing the kernel device name.
</para>
<para>The <command>fsid</command> algorithm generates
the device id from the <command>f_fsid</command> returned
from the <command>statfs()</command> syscall.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>fileid:mapping = ALGORITHM</term>
<listitem>
<para>This option is the legacy version of the
<command>fileid:algorithm</command> option, which was used in earlier
versions of fileid mapping feature in custom Samba 3.0 versions.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>fileid:fstype deny = LIST</term>
<listitem>
<para>List of file system types to be ignored for file_id
generation.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>fileid:fstype allow = LIST</term>
<listitem>
<para>List of file system types to be allowed for file_id
generation. If this option is set, file system types not listed
here are ignored.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>fileid:mntdir deny = LIST</term>
<listitem>
<para>List of file system mount points to be ignored for
file_id generation.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>fileid:mntdir allow = LIST</term>
<listitem>
<para>List of file system mount points to be allowed for file_id
generation. If this option is set, file system mount points
not listed here are ignored.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>EXAMPLES</title>
<para>Usage of the <command>fileid</command> module with the
<command>fsid</command> algorithm:</para>
<programlisting>
<smbconfsection name="[global]"/>
<smbconfoption name="vfs objects">fileid</smbconfoption>
<smbconfoption name="fileid:algorithm">fsid</smbconfoption>
</programlisting>
</refsect1>
<refsect1>
<title>VERSION</title>
<para>This man page is correct for version &doc.version; 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>
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