And on this end, we were hoping to have delegation support for the
FSAL_PROXY driver (NFS client side). Any thoughts on that?
> 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.
>
> Thanks,
> --
> Jeff Layton <jlay...@redhat.com>
>
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