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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">
3 <refentry id="vfs_gpfs.8">
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">&doc.version;</refmiscinfo>
15 <refname>vfs_gpfs</refname>
16 <refpurpose>gpfs specific samba extensions like acls</refpurpose>
21 <command>vfs objects = gpfs</command>
26 <title>DESCRIPTION</title>
28 <para>This VFS module is part of the
29 <citerefentry><refentrytitle>samba</refentrytitle>
30 <manvolnum>7</manvolnum></citerefentry> suite.</para>
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.
37 <para>Currently the gpfs vfs module provides extensions in following areas :
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>
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.
51 <para>This module makes use of the smb.conf parameter
52 <smbconfoption name="acl map full control"></smbconfoption>.
53 When set to yes (the default), this parameter will add in the FILE_DELETE_CHILD
54 bit on a returned ACE entry for a file (not a directory) that already
55 contains all file permissions except for FILE_DELETE and FILE_DELETE_CHILD.
56 This can prevent Windows applications that request GENERIC_ALL access
57 from getting ACCESS_DENIED errors when running against a filesystem
58 with NFSv4 compatible ACLs.
61 <para>This module is stackable.</para>
63 <para>Since Samba 4.0 all options are per share options.</para>
69 <title>OPTIONS</title>
75 <term>gpfs:sharemodes = [ yes | no ]</term>
78 Enable/Disable cross node sharemode handling for GPFS.
83 <command>yes(default)</command> - propagate sharemodes across all GPFS nodes.
86 <command>no</command> - do not propagate sharemodes across all GPFS nodes.
87 This should only be used if the GPFS file system is
88 exclusively exported by Samba. Access by local unix application or
89 NFS exports could lead to corrupted files.
97 <term>gpfs:leases = [ yes | no ]</term>
100 Enable/Disable cross node leases (oplocks) for GPFS.
101 You should also set the <command>oplocks</command> and <command>kernel oplocks</command>
102 options to the same value.
107 <command>yes(default)</command> - propagate leases across all GPFS nodes.
110 <command>no</command> - do not propagate leases across all GPFS nodes.
111 This should only be used if the GPFS file system is
112 exclusively exported by Samba. Access by local unix application or
113 NFS exports could lead to corrupted files.
122 <term>gpfs:hsm = [ yes | no ]</term>
125 Enable/Disable announcing if this FS has HSM enabled.
130 <command>no(default)</command> - Do not announce HSM.
133 <command>yes</command> - Announce HSM.
141 <term>gpfs:recalls = [ yes | no ]</term>
143 <para> When this option is set to no, an attempt to
144 open an offline file will be rejected with access
145 denied. This helps preventing recall storms triggered
146 by careless applications like Finder and
150 <listitem><para><command>yes(default)</command> - Open
151 files that are offline. This will recall the files
152 from HSM.</para></listitem>
153 <listitem><para><command>no</command> - Reject access
154 to offline files with access denied. This will prevent
155 recalls of files from HSM. Using this setting also
156 requires gpfs:hsm to be set to yes.</para></listitem>
164 <term>gpfs:getrealfilename = [ yes | no ]</term>
167 Enable/Disable usage of the <command>gpfs_get_realfilename_path()</command> function.
168 This improves the casesensitive wildcard file name access.
173 <command>yes(default)</command> - use <command>gpfs_get_realfilename_path()</command>.
176 <command>no</command> - do not use <command>gpfs_get_realfilename_path()</command>.
177 It seems that <command>gpfs_get_realfilename_path()</command> doesn't work on AIX.
185 <term>gpfs:winattr = [ yes | no ]</term>
188 Enable/Disable usage of the windows attributes in GPFS.
189 GPFS is able to store windows file attributes e.g. HIDDEN,
190 READONLY, SYSTEM and others natively. That means Samba doesn't
191 need to map them to permission bits or extended attributes.
196 <command>no(default)</command> - do not use GPFS windows attributes.
199 <command>yes</command> - use GPFS windows attributes.
207 <term>gpfs:acl = [ yes | no ]</term>
210 This option lets Samba use or ignore GPFS ACLs.
215 <command>yes(default)</command> - use GPFS ACLs.
218 <command>no</command> - do not use GPFS ACLs and pass everything
219 to the next SMB_VFS module.
227 <term>gpfs:check_fstype = [ yes | no ]</term>
230 Check for a mounted GPFS file system on access to a SMB share.
235 <command>yes(default)</command> - Check that the SMB share path
236 is on a GPFS file system. Share access will be denied when a
237 different file system is found.
240 <command>no</command> - skip check for GPFS file system on SMB
249 <term>gpfs:refuse_dacl_protected = [ yes | no ]</term>
252 As GPFS does not support the ACE4_FLAG_NO_PROPAGATE NFSv4 flag (which would be
253 the mapping for the DESC_DACL_PROTECTED flag), the status of this flag is
254 currently silently ignored by Samba. That means that if you deselect the "Allow
255 inheritable permissions..." checkbox in Windows' ACL dialog and then apply the
256 ACL, the flag will be back immediately.
259 To make sure that automatic migration with e.g. robocopy does not lead to
260 ACLs silently (and unintentionally) changed, you can set
261 <command>gpfs:refuse_dacl_protected = yes</command> to enable an explicit
262 check for this flag and if set, it will return NT_STATUS_NOT_SUPPORTED so
263 errors are shown up on the Windows side and the Administrator is aware of
264 the ACLs not being settable like intended
269 <command>no(default)</command> - ignore the DESC_DACL_PROTECTED flags.
272 <command>yes</command> - reject ACLs with DESC_DACL_PROTECTED.
280 <term>gpfs:dfreequota = [ yes | no ]</term>
283 Adjust reporting of the size and free space of a share
284 according to quotas. If this setting is "yes", a
285 request for size and free space will also evaluate the
286 user quota of the user requesting the data and the
287 group quota of the primary group of the user. Fileset
288 quotas are not queried, since GPFS already provides
289 the option --dfreequota to reflect the fileset quota
290 in the free space query. Please use that option to
291 include fileset quotas in the reported disk space.
295 If any of the soft or hard quota limits has been
296 reached, the free space will be reported as 0. If a
297 quota is in place, but the limits have not been
298 reached, the free space will be reported according to
299 the space left in the quota. If more than one quota
300 applies the free space will be reported as the smallest
301 space left in those quotas. The size of the share
302 will be reported according to the quota usage. If more
303 than one quota applies, the smallest size will be
304 reported for the share size according to these quotas.
309 <command>yes</command> - include the quotas
310 when reporting the share size and free space
313 <command>no(default)</command> - do not include quotas,
314 simply report the size and free space of the file system
322 <term>gpfs:settimes = [ yes | no ]</term>
325 Use the gpfs_set_times API when changing the
326 timestamps of a file or directory. If the GPFS API is
327 not available the old method of using utime and the
328 GPFS winattr call will be used instead.
333 <command>yes(default)</command> - Use gpfs_set_times.
334 Fall back to utime and winattr when it is not available.
337 <command>no</command> - Do not use gpfs_set_times.
345 <term>nfs4:mode = [ simple | special ]</term>
348 Controls substitution of special IDs (OWNER@ and GROUP@) on GPFS.
349 The use of mode simple is recommended.
350 In this mode only non inheriting ACL entries for the file owner
351 and group are mapped to special IDs.
354 <para>The following MODEs are understood by the module:</para>
356 <listitem><para><command>simple(default)</command> - use OWNER@ and GROUP@ special IDs for non inheriting ACEs only.</para></listitem>
357 <listitem><para><command>special(deprecated)</command> - use OWNER@ and GROUP@ special IDs in ACEs for all file owner and group ACEs.</para></listitem>
365 <term>nfs4:acedup = [dontcare|reject|ignore|merge]</term>
368 This parameter configures how Samba handles duplicate ACEs encountered in GPFS ACLs.
369 GPFS allows/creates duplicate ACE for different bits for same ID.
372 <para>Following is the behaviour of Samba for different values :</para>
374 <listitem><para><command>dontcare</command> - copy the ACEs as they come</para></listitem>
375 <listitem><para><command>reject (deprecated)</command> - stop operation and exit with error on ACL set op</para></listitem>
376 <listitem><para><command>ignore (deprecated)</command> - don't include the second matching ACE</para></listitem>
377 <listitem><para><command>merge (default)</command> - bitwise OR the 2 ace.flag fields and 2 ace.mask fields of the 2 duplicate ACEs into 1 ACE</para></listitem>
384 <term>nfs4:chown = [yes|no]</term>
386 <para>This parameter allows enabling or disabling the chown supported
387 by the underlying filesystem. This parameter should be enabled with
388 care as it might leave your system insecure.</para>
389 <para>Some filesystems allow chown as a) giving b) stealing. It is the latter
390 that is considered a risk.</para>
392 <para>Following is the behaviour of Samba for different values : </para>
394 <listitem><para><command>yes</command> - Enable chown if as supported by the under filesystem</para></listitem>
395 <listitem><para><command>no (default)</command> - Disable chown</para></listitem>
401 <term>gpfs:syncio = [yes|no]</term>
403 <para>This parameter makes Samba open all files with O_SYNC.
404 This triggers optimizations in GPFS for workloads that
405 heavily share files.</para>
407 <para>Following is the behaviour of Samba for different
411 <listitem><para><command>yes</command> - Open files with O_SYNC
413 <listitem><para><command>no (default)</command> - Open files as
414 normal Samba would do
424 <title>EXAMPLES</title>
426 <para>A GPFS mount can be exported via Samba as follows :</para>
429 <smbconfsection name="[samba_gpfs_share]"/>
430 <smbconfoption name="vfs objects">gpfs</smbconfoption>
431 <smbconfoption name="path">/test/gpfs_mount</smbconfoption>
432 <smbconfoption name="nfs4: mode">special</smbconfoption>
433 <smbconfoption name="nfs4: acedup">merge</smbconfoption>
438 <title>CAVEATS</title>
440 Depending on the version of gpfs, the <command>libgpfs_gpl</command>
441 library or the <command>libgpfs</command> library is needed at
442 runtime by the <command>gpfs</command> VFS module:
443 Starting with gpfs 3.2.1 PTF8, the complete <command>libgpfs</command>
444 is available as open source and <command>libgpfs_gpl</command> does no
445 longer exist. With earlier versions of gpfs, only the
446 <command>libgpfs_gpl</command> library was open source and could be
450 At build time, only the header file <command>gpfs_gpl.h</command>
451 is required, which is a symlink to <command>gpfs.h</command> in
452 gpfs versions newer than 3.2.1 PTF8.
457 <title>VERSION</title>
458 <para>This man page is part of version &doc.version; of the Samba suite.
463 <title>AUTHOR</title>
465 <para>The original Samba software and related utilities
466 were created by Andrew Tridgell. Samba is now developed
467 by the Samba Team as an Open Source project similar
468 to the way the Linux kernel is developed.</para>
470 <para>The GPFS VFS module was created with contributions from
471 Volker Lendecke and the developers at IBM.
474 <para> This manpage was created by the IBM FSCC team </para>