Re: [PATCH 3/4] NFSD: Add WRITE_PLUS support for hole punches

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On Sat, Nov 02, 2013 at 10:44:31AM -0400, J. Bruce Fields wrote:
> On Sat, Nov 02, 2013 at 06:54:09AM -0700, Christoph Hellwig wrote:
> > On Tue, Oct 29, 2013 at 09:06:49AM -0400, J. Bruce Fields wrote:
> > > What I meant was--why are we doing a sync at all, instead of returning
> > > NFS_UNSTABLE and making the client commit?
> > 
> > Did NFSv4.2 introduce a concept of unstable metadata operations?
> 
> No, but I think WRITE_PLUS does have a stable/unstable bit so I think we
> could choose not to do the sync if that'd make sense.

Both operations are idempotent, so supporting it shouldn't be a major
obstactle.  But suddenly having some metadata operations that can be
unstable seems like a major wart in the spec.

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