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VFS_GPFS(8)                                                                                      VFS_GPFS(8)



NAME
       vfs_gpfs - gpfs specific samba extensions like acls and prealloc

SYNOPSIS
       vfs objects = gpfs

DESCRIPTION
       This VFS module is part of the samba(7) suite.

       The  gpfs  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.

       Currently the gpfs vfs module provides extensions in following areas :

         NFSv4 ACL Interfaces with configurable options for GPFS

         Kernel oplock support on GPFS

         Lease support on GPFS



NOTE: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 responsi-bility responsibility
bility of the underlying filesystem than of Samba.

This module is stackable.

OPTIONS
       nfs4:mode = [ simple | special ]
          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.

          The following MODEs are understood by the module:

               simple(default) - do not use special IDs in GPFS ACEs

               special - use special IDs in GPFS ACEs.

       nfs4:acedup = [dontcare|reject|ignore|merge]
          This parameter configures how  Samba  handles  duplicate  ACEs  encountered  in  GPFS  ACLs.  GPFS
          allows/creates duplicate ACE for different bits for same ID.

          Following is the behaviour of Samba for different values :

               dontcare (default) - copy the ACEs as they come

               reject - stop operation and exit with error on ACL set op

               ignore - don't include the second matching ACE

               merge  - bitwise OR the 2 ace.flag fields and 2 ace.mask fields of the 2 duplicate ACEs into
                1 ACE

       nfs4:chown = [yes|no]
          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.

          Some filesystems allow chown as a) giving b) stealing. It is the latter that is considered a risk.

          Following is the behaviour of Samba for different values :

               yes - Enable chown if as supported by the under filesystem

               no (default) - Disable chown

EXAMPLES
       A GPFS mount can be exported via Samba as follows :


               [samba_gpfs_share]
            vfs objects = gpfs
            path = /test/gpfs_mount
            nfs4: mode = special
            nfs4: acedup = merge


CAVEATS
       The gpfs gpl libraries are required by gpfs VFS module during both compilation and runtime. Also this
       VFS module is tested to work on SLES 9/10 and RHEL 4.4

VERSION
       This man page is correct for version 3.0.25 of the Samba suite.

AUTHOR
       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  devel-oped. developed.
       oped.

       The GPFS VFS module was created with contributions from Volker Lendecke and the developers at IBM.

       This manpage was created by the IBM FSCC team




                                                                                                 VFS_GPFS(8)