On 04/14/2014 09:51 AM, Mathijs Kwik wrote:
But it's still whole-file based. btrfs is internally able to support block-level deduplication, which is very cool for making copies of things like database copies and virtualization images. Of course these cases are already served by snapshot volumes, but still it would be nice to see the full power exposed someday:)
It should be relatively easy, because in most our updates the changes to files are small and block-aligned (when name lengths don't change; mostly just path references change on re-builds), moreover in most cases one can easily guess which file pairs can have duplicate parts (even without any advanced schemes like rolling hashes).
Vlada
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