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