Mikulas Patocka <mpatocka(a)redhat.com> writes:
On Thu, 30 Aug 2018, Jeff Moyer wrote:
> Mike Snitzer <snitzer(a)redhat.com> writes:
> > Until we properly add DAX support to dm-snapshot I'm afraid we really do
> > need to tolerate this "regression". Since reality is the original
> > support for snapshot of a DAX DM device never worked in a robust way.
You can't support dax on snapshot - if someone maps a block and the block
needs to be moved, then what?
That's exactly the point I brought up in my reply to Jan. You'd have to
unmap all mappings of the page/block.