Don't do it!!! OK, I know Chris has described some block sharing. But I hate it. If I copy "resume" to "resume.save", it is because I want 2 copies for safety. I don't want the fs to reduce it to 1 copy. And reducing the duplicates is exactly opposite to Chris's paranoid make-multiple-copies-by-default. Now feel free to tell me I'm an idiot (other people do) :)
I would imagine that it would be optional and at worst, a specialized fork of btrfs that follows the mainline but adds the deduplication bits.
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