----- Original Message -----
> From: "Soumya Koduri" <skod...@redhat.com>
> To: "Jeff Layton" <jlay...@redhat.com>
> Cc: nfs-ganesha-devel@lists.sourceforge.net, "Yun-Chih Chen"
> <yunchih....@gmail.com>
> Sent: Monday, August 7, 2017 11:59:21 AM
> Subject: Re: [Nfs-ganesha-devel] NFSv4 delegation in Ganesha
>
>
>
> On 08/03/2017 08:42 PM, Jeff Layton wrote:
> > On Fri, 2017-05-19 at 11:55 +0530, Soumya Koduri wrote:
> >> Hi,
> >>
> >> On 05/18/2017 08:04 PM, Yun-Chih Chen wrote:
> >>> Hi, friends:
> >>>
> >>> I'm studying the affect of NFSv4 on Linux. As far as I know, NFS
> >>> implemented in Linux kernel supports read delegation but not write
> >>> delegation. I wonder if Ganesha implements write delegation? If yes,
> >>> can it take effect if accessed by Linux NFS client?
> >>>
> >>> I use the following config file to observe delegation in Ganesha:
> >>>
> >>> EXPORT {
> >>> Export_Id = 77;
> >>> Path = /e;
> >>> Pseudo = /e;
> >>> Access_Type = RW;
> >>> FSAL {
> >>> Name = XFS;
> >>> }
> >>>
> >>> Delegations = readwrite;
> >>> }
> >>>
> >>> NFSV4 {
> >>> Delegations = true;
> >>> }
> >>>
> >>> However, I did not see any trace of delegation under various workloads
> >>> (example: repeated read [1], repeated write [2]) using tools like
> >>> nfstrace or tcpdump. When running in debug mode, I always got the
> >>> following in the log file:
> >>>
> >>> ganesha.nfsd-8999[main] display_fsinfo :FSAL :DEBUG : delegations = 0
> >>>
> >>> indicating that delegation was not on.
> >>> Is there something wrong with my config file? Or any other clue
> >>> regarding NFS delegation? Thanks ( ;
> >>
> >> AFAIK except for FSAL_GPFS, other FSALs do not have support for
> >> delegations yet. Also after switching to new extended APIs
> >> (>=nfs-ganesha-2.4), delegations are disabled. It needs some additional
> >> work. We are planning to address it as part of adding this support for
> >> FSAL_GLUSTER (hopefully in 2.6 release). WRT XFS, I am not sure if
> >> anyone is actively looking at it.
> >>
> >> Thanks,
> >> Soumya
> >>
> >
> > Hi Soumya,
> >
> > I just started looking at delegation support in ganesha (mostly with an
> > eye toward plumbing in delegation support for Ceph).
> >
> > I think we probably need to rework the whole delegation interface (maybe
> > even give it a dedicated FSAL op), and was wondering if you had started
> > any work along those lines.
> >
>
> Hi Jeff,
>
> yes. I started it but have done only POC to mainly test the glusterfs
> lease support (which is experimental feature) at first. I could manage
> to get leases granted from and returned to the backend.
>
> The only changes I had done so far in the core ganesha layer is to
> uncomment earlier delegation code path to get the request all the way
> till FSAL [1]. I now intent to fix the SAL layer and happy to
> collaborate with you. Agree that instead of clubbing with lock, a
> dedicated fop shall be better.
>
>
I have now added new fop "lease_op2()" and pushed the changes (along with some
more fixes) to my github repo [1]. I am yet to test it out but please let me
know if that interface looks fine.
Thanks,
Soumya
[1] https://github.com/soumyakoduri/nfs-ganesha/commits/delegation_2_6
> Thanks,
> Soumya
>
>
> [1] https://review.gerrithub.io/372998
>
> > Thanks,
> >
>
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