Re: Write delegation

[Yudong Gao <stgyd@umich.edu>]

Hi,

I am not able to find the implementation of directory delegation,
either. Similarly, the callback functions CB_NOTIFY is not
implemented, either. I find that in preprocss_nfs41_op() in
callback_xdr.c, whenever a CB_NOTIFY is encountered, an
NFS4ERR_NOTSUPP is returned directly.

Am I missing something? Or they are just not supported in the current version?

Thanks a lot!

best,

Yudong

On Mon, Aug 2, 2010 at 5:17 PM, Yudong Gao <stgyd@umich.edu> wrote:
> Hi,
>
> I am looking at the delegation implementation in the source code of
> NFS 4.1 in kernel 2.6.32.15. I can find the code for read delegation,
> which is working and can serve the read requests locally. But I can
> never find the code about write delegation, which is supposed to cache
> the write update locally. I try to look at the functions including
> nfs_writepage(s), nfs_file_flush() but none of them checks or uses the
> write delegation.
>
> Is write delegation currently implemented in NFS 4.1?
>
> Thanks!
>
> best,
>
> Yudong
>