On Tue, Aug 27, 2024 at 09:21:49AM -0700, Darrick J. Wong wrote: > > For writes it usually means out of place write, but for reporting > > it gets translated to the FIEMAP_EXTENT_SHARED flag or is used to > > reject swapon. And the there is black magic in DAX. > > Hee hee. Yeah, let's leave IOMAP_F_SHARED alone; an out of place write > can be detected by iter->srcmap.type != HOLE. I can probably come up with a comment that includes the COWextsize hints in the definition of out of place writes and we should be all fine..
