[dm-devel] Snapshot target and DAX-capable devices
jmoyer at redhat.com
Thu Aug 30 19:53:31 UTC 2018
Mikulas Patocka <mpatocka at redhat.com> writes:
> On Thu, 30 Aug 2018, Jeff Moyer wrote:
>> Mike Snitzer <snitzer at 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.
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