Mikulas Patocka <mpatocka@xxxxxxxxxx> writes: > On Thu, 30 Aug 2018, Jeff Moyer wrote: > >> Mike Snitzer <snitzer@xxxxxxxxxx> 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. >> >> Agreed. >> >> -Jeff > > 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. -Jeff
