On Mon, Oct 21, 2019 at 11:00:04PM -0700, Eric Biggers wrote: > An alternative which would work nicely on ext4 and xfs (if xfs supported > fscrypt) would be to pass the physical block number as the DUN. However, that > wouldn't work at all on f2fs because f2fs moves data blocks around. XFS can also move data blocks around. Even ext4 can do that for limited cases (defrag).