On Thu, Dec 12, 2024 at 01:29:53PM -0800, Darrick J. Wong wrote: > > + /* > > + * On COW inodes we are forced to always rewrite an entire file system > > + * block. > > That's not quite accurate -- we're always forced to write an entire file > allocation unit so that the rest of the bmap code doesn't have to deal > with a file range that's mapped to multiple different space extents. > For all the existing reflink scenarios the allocation unit is always an > fsblock so this is a trifling difference. Which right now is a block until we support horrors such as reflink on larget rtextsize inodes or the forcealign stuff. But yes, it could use the helper.
