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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_crossrename.8">
<refmeta>
<refentrytitle>vfs_crossrename</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="source">Samba</refmiscinfo>
<refmiscinfo class="manual">System Administration tools</refmiscinfo>
<refmiscinfo class="version">4.1</refmiscinfo>
</refmeta>
<refnamediv>
<refname>vfs_crossrename</refname>
<refpurpose>server side rename files across filesystem boundaries</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>vfs objects = crossrename</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>vfs_crossrename</command> VFS module allows
server side rename operations even if source and target are on
different physical devices. A "move" in Explorer is usually a
rename operation if it is inside of a single share or device.
Usually such a rename operation returns
NT_STATUS_NOT_SAME_DEVICE and the client has to move the file by
manual copy and delete operations. If the rename by copy is done by the
server this can be much more efficient. vfs_crossrename tries to do
this server-side cross-device rename operation.
</para>
<para>There are however limitations that this module currently does not
solve:</para>
<variablelist>
<varlistentry>
<para>The ACLs of files are not preserved,</para>
</varlistentry>
<varlistentry>
<para>meta data in EAs are not preserved,</para>
</varlistentry>
<varlistentry>
<para>renames of whole subdirectories cannot be done recursively,
in that case we still return STATUS_NOT_SAME_DEVICE and
let the client decide what to do,</para>
</varlistentry>
<varlistentry>
<para>rename operations of huge files can cause hangs on the
client because clients expect a rename operation to
return fast.</para>
</varlistentry>
</variablelist>
<para>This module is stackable.</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>crossrename:sizelimit = BYTES</term>
<listitem>
<para>server-side cross-device-renames are only done
for files if the filesize is not larger than the defined
size in MiB to prevent timeouts. The default sizelimit is
20 (MiB)
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>EXAMPLES</title>
<para>To add server-side cross-device renames inside of a share
for all files sized up to 50MB:</para>
<programlisting>
<smbconfsection name="[testshare]"/>
<smbconfoption name="path">/data/mounts</smbconfoption>
<smbconfoption name="vfs objects">crossrename</smbconfoption>
<smbconfoption name="crossrename:sizelimit">50</smbconfoption>
</programlisting>
</refsect1>
<refsect1>
<title>VERSION</title>
<para>This man page is correct for version 4.0.0 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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