Will there be any way to tell if a reflink is still viable? I can tell if two files are hardlinked by looking at the inodes.
But can I tell if two files are reflinked? Can I tell if one has changed after the fact? If the smarter COW semantics that only copy necessary blocks in a changed file is used, is there any way to tell which portions of the file are common, or at least what percentage?
Can you reflink something more than once... I assume so. And if so, how does that impact the above questions.