> > >> This should call bdrv_is_allocated_above like the other block jobs do. > > >> It would be needed later anyway to backup only the topmost image. > > > > > > I do not need that information now, so why do you want that I add dead > code? > > > > I think you do. You're wasting time reading unallocated clusters and > > checking that they are zero. bdrv_is_allocated_above gives you the > > same information much more efficiently. > > I thought that just returns information if the data is allocated, or if data > is on > backing file? > > Or is data guaranteed to be zero if bdrv_is_allocated_above() return 0?
Oh, I need to pass NULL for base to get that information?
