Copy on write of unmodified data

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Hi,

I'm looking at using a btrfs with snapshots to implement a generational
backup capacity.  However, doing it the naïve way would have the side
effect that for a file that has been partially modified, after
snapshotting the file would be written with *mostly* the same data.  How
does btrfs' COW algorithm deal with that?  If necessary I might want to
write some smarter user space utilities for this.

	-hpa
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