On Tue, Sep 11, 2018 at 03:34:45PM -0700, Omar Sandoval wrote: > From: Omar Sandoval <osandov@xxxxxx> > > Btrfs will need this for swap file support. > > Signed-off-by: Omar Sandoval <osandov@xxxxxx> That looks reasonable. After reading the last patch, it's somewhat understandable why you cannot simply implemnet ->bmap and use the generic activation code. But it would be good to explain the reason(s) for why you can't here briefly to justify this patch.