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https://github.com/samba-team/samba.git
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45b14b18fe
Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk> Reviewed-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Garming Sam <garming@catalyst.net.nz>
139 lines
3.9 KiB
XML
139 lines
3.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
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<refentry id="vfs_btrfs.8">
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<refmeta>
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<refentrytitle>vfs_btrfs</refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="source">Samba</refmiscinfo>
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<refmiscinfo class="manual">System Administration tools</refmiscinfo>
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<refmiscinfo class="version">4.7</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>vfs_btrfs</refname>
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<refpurpose>
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Utilize features provided by the Btrfs filesystem
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</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>vfs objects = btrfs</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>DESCRIPTION</title>
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<para>This VFS module is part of the
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<citerefentry><refentrytitle>samba</refentrytitle>
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<manvolnum>8</manvolnum></citerefentry> suite.</para>
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<para>
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The <command>vfs_btrfs</command> VFS module exposes Btrfs
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specific features for use by Samba.
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</para>
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<para>
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Btrfs allows for multiple files to share the same on-disk data
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through the use cloned ranges. When an SMB client issues a
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request to copy duplicate data (via FSCTL_SRV_COPYCHUNK), this
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module maps the request to a Btrfs clone range IOCTL, instead
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of performing reads and writes required by a traditional copy.
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Doing so saves storage capacity and greatly reduces disk IO.
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</para>
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<para>
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This module also exposes Btrfs per-file compression support to
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SMB clients via the get/set compression fsctls.
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</para>
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<para>
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Btrfs snapshots can be manipulated by Samba's FSRVP server.
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Snapshot manipulation using this module is currently considered
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experimental, and is therefore disabled by default. The
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<command>vfs_snapper</command> module is instead recommended for
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this purpose.
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</para>
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<para>
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This module is stackable.
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</para>
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</refsect1>
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<refsect1>
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<title>OPTIONS</title>
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<variablelist>
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<varlistentry>
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<term>btrfs: manipulate snapshots = [yes|no]</term>
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<listitem>
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<para>
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When set to <emphasis>yes</emphasis>, experimental support for
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the creation and deletion of snapshots via corresponding Btrfs
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IOCTLs will be enabled. The default is <emphasis>no</emphasis>,
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which means that such requests are passed through to any
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underlying VFS module.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>CONFIGURATION</title>
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<para>
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<command>vfs_btrfs</command> requires that the underlying share
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path is a Btrfs subvolume.
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</para>
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<programlisting>
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<smbconfsection name="[share]"/>
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<smbconfoption name="vfs objects">btrfs</smbconfoption>
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<smbconfoption name="btrfs: manipulate snapshots">no</smbconfoption>
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</programlisting>
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<para>
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To use the experimental snapshot manipulation functionality
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provided by this module, it must be explicitly enabled, and
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Samba's FSRVP server must be running.
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</para>
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<para>
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The <command>vfs_shadow_copy</command> module can be used to
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expose snapshots created by <command>vfs_btrfs</command> to
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Windows Explorer as file / directory "previous versions".
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</para>
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<programlisting>
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<smbconfsection name="[global]"/>
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<smbconfoption name="rpc_daemon:fssd">fork</smbconfoption>
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<smbconfoption name="registry shares">yes</smbconfoption>
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<smbconfoption name="include">registry</smbconfoption>
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<smbconfsection name="[share]"/>
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<smbconfoption name="vfs objects">btrfs shadow_copy</smbconfoption>
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<smbconfoption name="btrfs: manipulate snapshots">yes</smbconfoption>
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</programlisting>
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</refsect1>
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<refsect1>
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<title>VERSION</title>
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<para>
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This man page is correct for version 4.3.0 of the Samba suite.
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</para>
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</refsect1>
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<refsect1>
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<title>AUTHOR</title>
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<para>The original Samba software and related utilities
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were created by Andrew Tridgell. Samba is now developed
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by the Samba Team as an Open Source project similar
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to the way the Linux kernel is developed.</para>
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</refsect1>
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</refentry>
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