On Wed, May 25, 2016 at 01:58:15AM -0700, H. Peter Anvin wrote: > 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. Sounds like it might be a job for one of the dedup tools (deupremove, bedup), or, if you're writing your own, the safe deduplication ioctl which underlies those tools. Hugo. -- Hugo Mills | Well, sir, the floor is yours. But remember, the hugo@... carfax.org.uk | roof is ours! http://carfax.org.uk/ | PGP: E2AB1DE4 | The Goons
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