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From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/2] ubifs: Allow O_DIRECT
Date: Mon, 24 Aug 2015 01:03:50 -0700
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Cc: Brian Norris <computersforpeace@gmail.com>,
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To: Artem Bityutskiy <dedekind1@gmail.com>
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On Mon, Aug 24, 2015 at 11:02:42AM +0300, Artem Bityutskiy wrote:
> Back when we were writing UBIFS, we did not need direct IO, so we did
> not implement it. But yes, probably someone who cares could just try
> implementing this feature.

So I think the answer here is to implement a real version insted of
adding hacks to pretend it is supported.