Re: [PATCHv2 3/3] block: relax direct io memory alignment

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On Thu, May 19, 2022 at 09:41:14AM +0200, Christoph Hellwig wrote:
> On Wed, May 18, 2022 at 10:56:04PM -0600, Keith Busch wrote:
> > I'm surely missing something here. I know the bvecs are not necessarily lbs
> > aligned, but why does that matter? Is there some driver that can only take
> > exactly 1 bvec, but allows it to be unaligned? If so, we could take the segment
> > queue limit into account, but I am not sure that we need to.
> 
> At least stacking drivers had all kinds of interesting limitations in
> this area.  How much testing did this series get with all kinds of
> interesting dm targets and md pesonalities?

The dma limit doesn't stack (should it?). It gets the default, sector size - 1,
so their constraints are effectively unchanged.



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