Christoph Hellwig <h...@infradead.org> writes:

>> Again, the right return value for the O_DIRECT case is EINVAL.
>
> Is it?  We define -EAGAIN as it would block, which is defintively true
> for O_DIRECT reads.

It will *always* block.  So I don't think it's valid to ask for a
non-blocking read on a file opened with O_DIRECT.  What am I missing?

Cheers,
Jeff
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