Re: [PATCH v4 2/4] generic: test mmap io fom DAX to non-DAX

Christoph Hellwig
2017-04-18T10:12:27Z

On Mon, Apr 17, 2017 at 03:14:13PM +0800, Xiong Zhou wrote:
> Mount TEST_DEV as non-DAX, SCRATCH_DEV as DAX, then
> do mmap DIO from DAX to non-DAX.
>
> This test is split from generic/413. Since DIO from DAX
> to non-DAX is only supported/doable when device underneath
> has memory(struct page) backend.
>
> By ndctl looking at SCRATCH_DEV, skip this test if it is
> not in "memory mode".

DAX devices don't need to be something using NFIT, so I don't think this
method is correct.