Re: directory delegations

["bfields@fieldses.org" <bfields@fieldses.org>]

On Tue, Apr 02, 2019 at 09:51:42PM +0000, Trond Myklebust wrote:
> On Tue, 2019-04-02 at 15:41 -0400, J. Bruce Fields wrote:
> > On Tue, Apr 02, 2019 at 01:26:19PM -0400, Bradley C. Kuszmaul wrote:
> > > My simple model of metadata operations is to untar something like
> > > the linux sources.
> > > 
> > > Each file incurs a LOOKUP, CREATE, SETATTR, and WRITE, each of
> > > which
> > > is fairly high latency (even the WRITE ends up being done
> > > essentially synchronously because tar closes the file after its
> > > write(2) call.)
> > 
> > An ordinary file write delegation can help with some of that.
> > 
> > > I guess directory delegations might save the cost of LOOKUP.
> > > 
> > > Is there any hope for getting write delegations?
> > > 
> > > What other steps might be possible?
> > 
> > Trond, wasn't there a draft describing your idea that a server should
> > be
> > able to grant a write delegation on create and delay the sync?  I
> > can't
> > find it right now.
> 
> 
> Do you mean this one? 
> https://tools.ietf.org/html/draft-haynes-nfsv4-delstid-00

Maybe it's too subtle for me.  What's the part that allows delaying sync
on create?

--b.