Offline Deduplication for Btrfs V2

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Just a quick update, I've dropped the hashing stuff in favor of doing a memcmp
in the kernel to make sure the data is still the same.  The thing that takes a
while is reading the data up from disk, so doing a memcmp of the entire buffer
isn't that big of a deal, not to mention there's a possiblity for malicious
users if there is a problem with the hashing algorithms we use.  Plus this makes
the interface simpler.  Thanks,

Josef
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