Re: [PATCH 2/5] dax: fix offset to physical address translation

[Dan Williams]

On Tue, Sep 6, 2016 at 9:49 AM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
> In pgoff_to_phys() 'pgoff' is already relative to base of the dax
> device, so we only need to compare if the current offset is within the
> current resource extent.  Otherwise, we are double accounting the
> resource start offset when translating pgoff to a physical address.
>
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>

On second look this results in the exact same translation, correct in
both cases.  This is also confirmed by a new ndctl unit test that does
data verification by writing through a /dev/pmem device and the
verifying via a /dev/dax device associated with the same namespace, so
I'm dropping this patch.