1<?xml version="1.0" encoding="iso-8859-1"?> 2<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc"> 3<refentry id="vfs_gpfs.8"> 4 5<refmeta> 6 <refentrytitle>vfs_gpfs</refentrytitle> 7 <manvolnum>8</manvolnum> 8 <refmiscinfo class="source">Samba</refmiscinfo> 9 <refmiscinfo class="manual">System Administration tools</refmiscinfo> 10 <refmiscinfo class="version">3.5</refmiscinfo> 11</refmeta> 12 13 14<refnamediv> 15 <refname>vfs_gpfs</refname> 16 <refpurpose>gpfs specific samba extensions like acls and prealloc</refpurpose> 17</refnamediv> 18 19<refsynopsisdiv> 20 <cmdsynopsis> 21 <command>vfs objects = gpfs</command> 22 </cmdsynopsis> 23</refsynopsisdiv> 24 25<refsect1> 26 <title>DESCRIPTION</title> 27 28 <para>This VFS module is part of the 29 <citerefentry><refentrytitle>samba</refentrytitle> 30 <manvolnum>7</manvolnum></citerefentry> suite.</para> 31 32 <para>The <command>gpfs</command> VFS module is the home 33 for all gpfs extensions that Samba requires for proper integration 34 with GPFS. It uses the GPL library interfaces provided by GPFS. 35 </para> 36 37 <para>Currently the gpfs vfs module provides extensions in following areas : 38 <itemizedlist> 39 <listitem><para>NFSv4 ACL Interfaces with configurable options for GPFS</para></listitem> 40 <listitem><para>Kernel oplock support on GPFS</para></listitem> 41 <listitem><para>Lease support on GPFS</para></listitem> 42 </itemizedlist> 43 </para> 44 45 <para><command>NOTE:</command>This module follows the posix-acl behaviour 46 and hence allows permission stealing via chown. Samba might allow at a later 47 point in time, to restrict the chown via this module as such restrictions 48 are the responsibility of the underlying filesystem than of Samba. 49 </para> 50 51 <para>This module is stackable.</para> 52 53</refsect1> 54 55 56<refsect1> 57 <title>OPTIONS</title> 58 59 <variablelist> 60 61 <varlistentry> 62 63 <term>nfs4:mode = [ simple | special ]</term> 64 <listitem> 65 <para> 66 Enable/Disable substitution of special IDs on GPFS. This parameter 67 should not affect the windows users in anyway. It only ensures that Samba 68 sets the special IDs - OWNER@ and GROUP@ ( mappings to simple uids ) 69 that are relevant to GPFS. 70 </para> 71 72 <para>The following MODEs are understood by the module:</para> 73 <itemizedlist> 74 <listitem><para><command>simple(default)</command> - do not use special IDs in GPFS ACEs</para></listitem> 75 <listitem><para><command>special</command> - use special IDs in GPFS ACEs. </para> </listitem> 76 </itemizedlist> 77 </listitem> 78 79 </varlistentry> 80 81 82 <varlistentry> 83 <term>nfs4:acedup = [dontcare|reject|ignore|merge]</term> 84 <listitem> 85 <para> 86 This parameter configures how Samba handles duplicate ACEs encountered in GPFS ACLs. 87 GPFS allows/creates duplicate ACE for different bits for same ID. 88 </para> 89 90 <para>Following is the behaviour of Samba for different values :</para> 91 <itemizedlist> 92 <listitem><para><command>dontcare (default)</command> - copy the ACEs as they come</para></listitem> 93 <listitem><para><command>reject</command> - stop operation and exit with error on ACL set op</para></listitem> 94 <listitem><para><command>ignore</command> - don't include the second matching ACE</para></listitem> 95 <listitem><para><command>merge</command> - bitwise OR the 2 ace.flag fields and 2 ace.mask fields of the 2 duplicate ACEs into 1 ACE</para></listitem> 96 </itemizedlist> 97 </listitem> 98 </varlistentry> 99 100 101 <varlistentry> 102 <term>nfs4:chown = [yes|no]</term> 103 <listitem> 104 <para>This parameter allows enabling or disabling the chown supported 105 by the underlying filesystem. This parameter should be enabled with 106 care as it might leave your system insecure.</para> 107 <para>Some filesystems allow chown as a) giving b) stealing. It is the latter 108 that is considered a risk.</para> 109 110 <para>Following is the behaviour of Samba for different values : </para> 111 <itemizedlist> 112 <listitem><para><command>yes</command> - Enable chown if as supported by the under filesystem</para></listitem> 113 <listitem><para><command>no (default)</command> - Disable chown</para></listitem> 114 </itemizedlist> 115 </listitem> 116 </varlistentry> 117 118 </variablelist> 119</refsect1> 120 121<refsect1> 122 <title>EXAMPLES</title> 123 124 <para>A GPFS mount can be exported via Samba as follows :</para> 125 126<programlisting> 127 <smbconfsection name="[samba_gpfs_share]"/> 128 <smbconfoption name="vfs objects">gpfs</smbconfoption> 129 <smbconfoption name="path">/test/gpfs_mount</smbconfoption> 130 <smbconfoption name="nfs4: mode">special</smbconfoption> 131 <smbconfoption name="nfs4: acedup">merge</smbconfoption> 132</programlisting> 133</refsect1> 134 135<refsect1> 136 <title>CAVEATS</title> 137 <para>The gpfs gpl libraries are required by <command>gpfs</command> VFS 138 module during both compilation and runtime. 139 Also this VFS module is tested to work on SLES 9/10 and RHEL 4.4 140 </para> 141</refsect1> 142 143<refsect1> 144 <title>VERSION</title> 145 <para>This man page is correct for version 3.0.25 of the Samba suite. 146 </para> 147</refsect1> 148 149<refsect1> 150 <title>AUTHOR</title> 151 152 <para>The original Samba software and related utilities 153 were created by Andrew Tridgell. Samba is now developed 154 by the Samba Team as an Open Source project similar 155 to the way the Linux kernel is developed.</para> 156 157 <para>The GPFS VFS module was created with contributions from 158 Volker Lendecke and the developers at IBM. 159 </para> 160 161 <para> This manpage was created by the IBM FSCC team </para> 162</refsect1> 163 164</refentry> 165