[Samba] Linux & NFSv4 ACLs

Nick Couchman nick.couchman at seakr.com
Fri Dec 4 02:31:36 UTC 2015

----- Original Message -----
> From: "Jeremy Allison" <jra at samba.org>
> To: "Nick E Couchman" <nick.couchman at seakr.com>
> Cc: samba at lists.samba.org
> Sent: Thursday, December 3, 2015 6:13:51 PM
> Subject: Re: [Samba] Linux & NFSv4 ACLs

> On Thu, Dec 03, 2015 at 06:03:39PM -0700, Nick Couchman wrote:
>> > On Dec 3, 2015, at 17:24, Jeremy Allison <jra at samba.org> wrote:
>> > 
>> >> On Thu, Dec 03, 2015 at 03:54:21PM -0700, Nick Couchman wrote:
>> >> I have a situation where I need to share, via Samba, a filesystem mounted via
>> >> NFSv4.  I'm struggling with the best way to make Samba see the NFSv4 ACLs and
>> >> enumerate them to provide the proper SMB/CIFS access to the files, instead of
>> >> "Access Denied" errors that I currently get.
>> >> 
>> >> Looking at the Samba source, the only obvious NFSv4 stuff appears to be the
>> >> following:
>> >> - zfsacl, available only on Solaris or FreeBSD, which provides NFSv4 ACL support
>> >> simply because that's what ZFS uses.  Don't see a way to use this on Linux.
>> >> - gpfs, available only if you happen to have the GPFS code/headers installed
>> >> (gpfs_gpl.h), and I cannot find an obvious place to get those, or if they are
>> >> even freely-available.
>> >> - aixacl/aixacl2, looks like it only works on AIX.
>> >> 
>> >> First, am I correct in the above findings - that there is no way to operate any
>> >> of these three modules on Linux out of the box?  Second, am I missing something
>> >> obvious related to NFSv4 ACLs on Linux, or is there some other VFS module
>> >> somewhere that supports NFSv4 ACLs?
>> >> 
>> >> Also, no, it is not an option to mount the filesystems in question with NFSv3 +
>> >> ACLs - due to NFS referrals, automatic mounting of sub-filesystems, etc., I
>> >> really need it to use NFSv4.
>> >> 
>> >> Any advice?
>> > 
>> > How are the NFSv4 ACL exposed to Linux command-line
>> > tools ? Are there such ?
>> Yeah, CentOS 7 has nfs4_getfacl and nfs4_setfacl.  Will send example output.
> OK, what I need is access to the source code of
> these to see how they're getting programatic
> access to the ACL data.
> Given that it shouldn't be too hard to adapt
> source3/modules/vfs_nfs4acl_xattr.c to use the
> underlying API these tools use.

Try these pages (U Michigan):

and here:

I'm pretty sure that first link is the source that the RHEL/CentOS tools comes from.  Here's output from YUM on CentOS

[root at snapshots ~]# yum whatprovies *bin/nfs4_getfacl
Loaded plugins: fastestmirror
No such command: whatprovies. Please use /usr/bin/yum --help
[root at snapshots ~]# yum whatprovides *bin/nfs4_getfacl
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * extras: linux.mirrors.es.net
nfs4-acl-tools-0.3.3-13.el7.x86_64 : The nfs4 ACL tools
Repo        : base
Matched from:
Filename    : /usr/bin/nfs4_getfacl


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