samba - Mar 2015 - NFS4 ACLs with samba 3 (or 4)

> Date: Thu, 19 Mar 2015 11:59:47 +0100
> From: Volker.Lendecke at SerNet.DE
> To: groucho.64738 at hotmail.com
> CC: samba at lists.samba.org
> Subject: Re: [Samba] NFS4 ACLs with samba 3 (or 4)
> 
> On Wed, Mar 18, 2015 at 01:17:34PM -0400, Kevin Taylor wrote:
> > I know this was discussed a lot a few years ago, but my google
searches aren't quite getting me where I'm confident in the answer, so I
figure I'd just ask again here if that's ok.
> > 
> > Here's what we have, and what we'd like to do:
> > 
> > Storage is a Netapp (cluster mode CDOT 8.2 I believe), it's NFS
exported to our linux system.
> > 
> > Linux system is CentOS 6 and can NFS mount the Netapp using version 4.
NFSv3 doesn't support ACLs with Netapp, but NFSv4 does with the nfs4_setfacl
and nfs4_getfacl commands.
> > 
> > We'd like to share out the NFS mounted volume with samba, and
retain the NFSv4 acl capability so that Windows users can set advanced
permissions on the files.
> > 
> > 
> > Is this possible? 
> > 
> > I've seen posts about the ZFS ability and the GPFS ability, but
none of those are really what we're doing (I'm not sure why the backend
would necessarily matter). Would one of the other vfs items work in this case?
We're just NFS mounting onto the linux machine straight over TCP, nothing
special like iscsi or custom drivers.
> 
> The problem is that there is no common API on Linux to read and modify
> those NFSv4 ACLs. Both GPFS and possibly ZFS have their own idea how to
> view and set NFSv4 ACLs, so every file system needs its own adapter.
> 
> I haven't recently followed the nfsv4 kernel client, so I don't
know
> what the API for that would be these days. Do you have any pointers there?
> 
> It should be moderate effort to adapt the relevant pieces from the GPFS
> and NFSv4 pieces of the modules/ subdirectory.
> 
> Volker
> 
Unfortunately I'm not a programmer, so I don't know if there is an API
or not. As far as me the user can tell is that we have an NFSv4 filesystem
mounted on the linux box. We have tools available through the nfs4-acl-tools
package (this is on CentOS 6, for example) that offer me the ability to read and
set the ACLs on the volume. I figure at some level, someone must have had an API
because these tools aren't specific to the underlying filesystem as this
could really be offered from anything.

I didn't see any other packages related to the nfs4-acl-tools, so
there's no devel piece or anything that comes with it.




> > 
> > 
> > Thanks.
> > 
> > 
> >  		 	   		  
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On Thu, Mar 19, 2015 at 10:16:20AM -0400, Kevin Taylor wrote:
> Unfortunately I'm not a programmer, so I don't know if there is an
API or not. As far as me the user can tell is that we have an NFSv4 filesystem
mounted on the linux box. We have tools available through the nfs4-acl-tools
package (this is on CentOS 6, for example) that offer me the ability to read and
set the ACLs on the volume. I figure at some level, someone must have had an API
because these tools aren't specific to the underlying filesystem as this
could really be offered from anything.
Well the API is propably just stuffing blobs into extended
attributes directly from userspace. That's how most of
the NFSv4 ACLs usually get done :-(.

Of course all implementations use different blobs containing
different things to do the same thing :-).

Am 19.03.2015 um 17:39 schrieb Jeremy Allison:
> On Thu, Mar 19, 2015 at 10:16:20AM -0400, Kevin Taylor wrote:
> 
>> Unfortunately I'm not a programmer, so I don't know if there is
an API or not. As far as me the user can tell is that we have an NFSv4
filesystem mounted on the linux box. We have tools available through the
nfs4-acl-tools package (this is on CentOS 6, for example) that offer me the
ability to read and set the ACLs on the volume. I figure at some level, someone
must have had an API because these tools aren't specific to the underlying
filesystem as this could really be offered from anything.
> 
> Well the API is propably just stuffing blobs into extended
> attributes directly from userspace. That's how most of
> the NFSv4 ACLs usually get done :-(.
> 
> Of course all implementations use different blobs containing
> different things to do the same thing :-).
> 
make sure that you dont run in a open files limit with ntfs4 acl on
netapp ( i think this was in the orig question ) , there may be a max of
32000 per head ( if exist ) or 64000 in summa


Best Regards
MfG Robert Schetterer

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