Re: [PATCH 1/2] NFSv4.1: Ask for no delegation on OPEN if using O_DIRECT

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On Tue, Feb 03, 2015 at 04:59:43PM -0500, Trond Myklebust wrote:
> If we're using NFSv4.1, then we have the ability to let the server know
> whether or not we believe that returning a delegation as part of our OPEN
> request would be useful.
> The feature needs to be used with care, since the client sending the request
> doesn't necessarily know how other clients are using that file, and how
> they may be affected by the delegation.
> For this reason, our initial use of the feature will be to let the server
> know when the client believes that handing out a delegation would not be
> useful.
> The first application for this function is when opening the file using
> O_DIRECT.

I can't see why O_DIRECT openers would not want to use a delegation, can you
explain your rationale?

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