Re: [PATCH v7 16/19] iomap: Add done_before argument to iomap_dio_rw

[Christoph Hellwig]

On Thu, Sep 09, 2021 at 10:22:56AM -0700, Linus Torvalds wrote:
> I think you misunderstand.
> 
> Or maybe I do.
> 
> It very much doesn't force sync in this case. It did the *first* part
> of it synchronously, but then it wants to continue with that async
> part for the rest, and very much do that async completion.
> 
> And that's why it wants to add that "I already did X much of the
> work", exactly so that the async completion can report the full end
> result.

Could be, and yes in that case it won't work.