On Thu, Aug 27, 2009 at 05:14:17PM -0700, Roger A. Faulkner wrote:
> > Actually, NFSv3 and NFSv4 already have this. I think our server just
> > sets this to a constant, and our client doesn't use it.
>
> I know that NFSv3 and NFSv4 send nanosecond-resolution
> timestamps over the wire. That's not the problemm.
They actually have a time_delta per-filesystem attribute. From RFC3530:
time_delta 51 nfstime4 READ Smallest useful
server time
granularity.
I only took a brief look, but it seems that our client doesn't use this
(since there was no _PC_TIMESTAMP_RESOLUTION pathconf...). And our
server, IIUC, has a hard-coded constant for this (since there was no
_PC_TIMESTAMP_RESOLUTION VOP_PATHCONF...).
> What is needed is a VOP_PATHCONF(_PC_TIMESTAMP_RESOLUTION)
> operation for NFS that returns the actual timestamp resolution
> for the underlying file system.
Yes; the protocol has it already. Sorry I wasn't clear earlier.
I did a quick search for solaris/kernel/nfs CRs that mention time_delta,
and found none.
Nico
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