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

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On Mon, Oct 28, 2013 at 05:40:30PM -0400, J. Bruce Fields wrote:
> On Mon, Oct 28, 2013 at 10:57:25AM -0400, Anna Schumaker wrote:
> > This patch only implements DATA_CONTENT_HOLE support, but I tried to
> > write it so other arms of the discriminated union can be added easily
> > later.
> 
> And there's an NFS4ERR_UNION_NOTSUPP to handle that case, OK.  (Though
> the spec language is a little ambiguous:
> 
> 	If the client asks for a hole and the server does not support
> 	that arm of the discriminated union, but does support one or
> 	more additional arms, it can signal to the client that it
> 	supports the operation, but not the arm with
> 	NFS4ERR_UNION_NOTSUPP.

Where is this language coming from?  Seems like the latest document in
NFSv4.2/ repo still calls WRITE_PLUS INITIALIZE and doesn't have
anything content related, just a weird "ADB" concept.

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