On Thu, May 19, 2022 at 10:35:23AM -0600, Keith Busch wrote:

quoted

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.

In general it should stack, as modulo implementation issues stacking
drivers sould not care about the alignment.  However since it doesn't
there might be some of those.