It's orthogonal to dedup being on or off, and as someone else said, it's more or less the same underlying semantics you would expect from cp --reflink anywhere.

It's orthogonal to dedup being on or off, and as someone else said, it's more or less the same underlying semantics you would expect from cp --reflink anywhere. Also, as mentioned, on Linux, it's not wired up with any interface to be used at all right now.