.\"     Title: vfs_gpfs
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.74.0 <http://docbook.sf.net/>
.\"      Date: 06/18/2010
.\"    Manual: System Administration tools
.\"    Source: Samba 3.5
.\"  Language: English
.\"
.TH "VFS_GPFS" "8" "06/18/2010" "Samba 3\&.5" "System Administration tools"
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.\" * MAIN CONTENT STARTS HERE *
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.SH "Name"
vfs_gpfs \- gpfs specific samba extensions like acls and prealloc
.SH "Synopsis"
.fam C
.HP \w'\ 'u
\FCvfs objects = gpfs\F[]
.fam
.SH "DESCRIPTION"
.PP
This VFS module is part of the
\fBsamba\fR(7)
suite\&.
.PP
The
\FCgpfs\F[]
VFS module is the home for all gpfs extensions that Samba requires for proper integration with GPFS\&. It uses the GPL library interfaces provided by GPFS\&.
.PP
Currently the gpfs vfs module provides extensions in following areas :
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
NFSv4 ACL Interfaces with configurable options for GPFS
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Kernel oplock support on GPFS
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Lease support on GPFS
.sp
.RE
.PP
\FCNOTE:\F[]This module follows the posix\-acl behaviour and hence allows permission stealing via chown\&. Samba might allow at a later point in time, to restrict the chown via this module as such restrictions are the responsibility of the underlying filesystem than of Samba\&.
.PP
This module is stackable\&.
.SH "OPTIONS"
.PP
nfs4:mode = [ simple | special ]
.RS 4
Enable/Disable substitution of special IDs on GPFS\&. This parameter should not affect the windows users in anyway\&. It only ensures that Samba sets the special IDs \- OWNER@ and GROUP@ ( mappings to simple uids ) that are relevant to GPFS\&.
.sp
The following MODEs are understood by the module:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\FCsimple(default)\F[]
\- do not use special IDs in GPFS ACEs
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\FCspecial\F[]
\- use special IDs in GPFS ACEs\&.
.sp
.RE
.RE
.PP
nfs4:acedup = [dontcare|reject|ignore|merge]
.RS 4
This parameter configures how Samba handles duplicate ACEs encountered in GPFS ACLs\&. GPFS allows/creates duplicate ACE for different bits for same ID\&.
.sp
Following is the behaviour of Samba for different values :
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\FCdontcare (default)\F[]
\- copy the ACEs as they come
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\FCreject\F[]
\- stop operation and exit with error on ACL set op
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\FCignore\F[]
\- don\'t include the second matching ACE
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\FCmerge\F[]
\- bitwise OR the 2 ace\&.flag fields and 2 ace\&.mask fields of the 2 duplicate ACEs into 1 ACE
.sp
.RE
.RE
.PP
nfs4:chown = [yes|no]
.RS 4
This parameter allows enabling or disabling the chown supported by the underlying filesystem\&. This parameter should be enabled with care as it might leave your system insecure\&.
.sp
Some filesystems allow chown as a) giving b) stealing\&. It is the latter that is considered a risk\&.
.sp
Following is the behaviour of Samba for different values :
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\FCyes\F[]
\- Enable chown if as supported by the under filesystem
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\FCno (default)\F[]
\- Disable chown
.sp
.RE
.RE
.SH "EXAMPLES"
.PP
A GPFS mount can be exported via Samba as follows :
.sp
.if n \{\
.RS 4
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.fam C
.ps -1
.nf
.if t \{\
.sp -1
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.BB lightgray adjust-for-leading-newline
.sp -1

        \fI[samba_gpfs_share]\fR
	\m[blue]\fBvfs objects = gpfs\fR\m[]
	\m[blue]\fBpath = /test/gpfs_mount\fR\m[]
	\m[blue]\fBnfs4: mode = special\fR\m[]
	\m[blue]\fBnfs4: acedup = merge\fR\m[]
.EB lightgray adjust-for-leading-newline
.if t \{\
.sp 1
.\}
.fi
.fam
.ps +1
.if n \{\
.RE
.\}
.SH "CAVEATS"
.PP
The gpfs gpl libraries are required by
\FCgpfs\F[]
VFS module during both compilation and runtime\&. Also this VFS module is tested to work on SLES 9/10 and RHEL 4\&.4
.SH "VERSION"
.PP
This man page is correct for version 3\&.0\&.25 of the Samba suite\&.
.SH "AUTHOR"
.PP
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\&.
.PP
The GPFS VFS module was created with contributions from Volker Lendecke and the developers at IBM\&.
.PP
This manpage was created by the IBM FSCC team