nfs4:mode = [ simple | special ]
Controls substitution of special IDs (OWNER@ and GROUP@) on NFS4 ACLs. The use of mode simple is
recommended. In this mode only non inheriting ACL entries for the file owner and group are mapped to
special IDs.
The following MODEs are understood by the module:
• simple(default) - use OWNER@ and GROUP@ special IDs for non inheriting ACEs only.
• special(deprecated) - use OWNER@ and GROUP@ special IDs in ACEs for all file owner and
group ACEs.
nfs4:acedup = [dontcare|reject|ignore|merge]
This parameter configures how Samba handles duplicate ACEs encountered in NFS4 ACLs. They allow
creating duplicate ACEs with different bits for same ID, which may confuse the Windows clients.
Following is the behaviour of Samba for different values :
• dontcare - copy the ACEs as they come
• reject (deprecated) - stop operation and exit with error on ACL set op
• ignore (deprecated) - don't include the second matching ACE
• merge (default) - 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
gpfs:sharemodes = [ yes | no ]
Enable/Disable cross node sharemode handling for GPFS.
• yes(default) - propagate sharemodes across all GPFS nodes.
• no - do not propagate sharemodes across all GPFS nodes. This should only be used if the
GPFS file system is exclusively exported by Samba. Access by local unix application or NFS
exports could lead to corrupted files.
gpfs:leases = [ yes | no ]
Enable/Disable cross node leases (oplocks) for GPFS. You should also set the oplocks and kernel
oplocks options to the same value.
• yes(default) - propagate leases across all GPFS nodes.
• no - do not propagate leases across all GPFS nodes. This should only be used if the GPFS
file system is exclusively exported by Samba. Access by local unix application or NFS
exports could lead to corrupted files.
gpfs:hsm = [ yes | no ]
Enable/Disable announcing if this FS has HSM enabled.
• no(default) - Do not announce HSM.
• yes - Announce HSM.
gpfs:recalls = [ yes | no ]
When this option is set to no, an attempt to open an offline file will be rejected with access
denied. This helps preventing recall storms triggered by careless applications like Finder and
Explorer.
• yes(default) - Open files that are offline. This will recall the files from HSM.
• no - Reject access to offline files with access denied. This will prevent recalls of files
from HSM. Using this setting also requires gpfs:hsm to be set to yes.
gpfs:getrealfilename = [ yes | no ]
Enable/Disable usage of the gpfs_get_realfilename_path() function. This improves the casesensitive
wildcard file name access.
• yes(default) - use gpfs_get_realfilename_path().
• no - do not use gpfs_get_realfilename_path(). It seems that gpfs_get_realfilename_path()
doesn't work on AIX.
gpfs:winattr = [ yes | no ]
Enable/Disable usage of the windows attributes in GPFS. GPFS is able to store windows file attributes
e.g. HIDDEN, READONLY, SYSTEM and others natively. That means Samba doesn't need to map them to
permission bits or extended attributes.
• no(default) - do not use GPFS windows attributes.
• yes - use GPFS windows attributes.
gpfs:acl = [ yes | no ]
This option lets Samba use or ignore GPFS ACLs.
• yes(default) - use GPFS ACLs.
• no - do not use GPFS ACLs and pass everything to the next SMB_VFS module.
gpfs:check_fstype = [ yes | no ]
Check for a mounted GPFS file system on access to a SMB share.
• yes(default) - Check that the SMB share path is on a GPFS file system. Share access will
be denied when a different file system is found.
• no - skip check for GPFS file system on SMB share path.
gpfs:dfreequota = [ yes | no ]
Adjust reporting of the size and free space of a share according to quotas. If this setting is "yes",
a request for size and free space will also evaluate the user quota of the user requesting the data
and the group quota of the primary group of the user. Fileset quotas are not queried, since GPFS
already provides the option --dfreequota to reflect the fileset quota in the free space query. Please
use that option to include fileset quotas in the reported disk space.
If any of the soft or hard quota limits has been reached, the free space will be reported as 0. If a
quota is in place, but the limits have not been reached, the free space will be reported according to
the space left in the quota. If more than one quota applies the free space will be reported as the
smallest space left in those quotas. The size of the share will be reported according to the quota
usage. If more than one quota applies, the smallest size will be reported for the share size
according to these quotas.
• yes - include the quotas when reporting the share size and free space
• no(default) - do not include quotas, simply report the size and free space of the file
system
gpfs:settimes = [ yes | no ]
Use the gpfs_set_times API when changing the timestamps of a file or directory. If the GPFS API is
not available the old method of using utime and the GPFS winattr call will be used instead.
• yes(default) - Use gpfs_set_times. Fall back to utime and winattr when it is not
available.
• no - Do not use gpfs_set_times.
gpfs:clamp_invalid_times = [ yes | no ]
GPFS stores timestamps using 32-bit unsigned integers for the seconds component. When using
gpfs:settimes = yes, this module validates times that clients attempt to set are within the supported
GPFS range between 0 and UINT32_MAX. If a timestamp is outside of this range, the client request is
rejected. To cope with clients setting eg temporary timestamps outside the valid range, this
parameter can be used to clamp the client timestamp to the allowed range. Times before Thu Jan 1
12:00:00 AM UTC 1970 (the UNIX epock) are then set to Thu Jan 1 12:00:00 AM UTC 1970, times after Sun
Feb 7 06:28:15 AM UTC 2106 will be set to Sun Feb 7 06:28:15 AM UTC 2106.
• no(default) - Fail request with invalid time.
• yes - clamp invalid times to 0 or UINT32_MAX.
gpfs:syncio = [yes|no]
This parameter makes Samba open all files with O_SYNC. This triggers optimizations in GPFS for
workloads that heavily share files.
Following is the behaviour of Samba for different values:
• yes - Open files with O_SYNC
• no (default) - Open files as normal Samba would do
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