Originally posted by Khrundel
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The log goes back to April 2008 when btrfs v0.13 already had: COW, checksumming, transactions, snapshots, subvolumes...
But a wider answer regarding "day 1" issue is that in copy-on-write-b-tree system, snapshotting is part of the architecture.
First you start with snapshots for each transaction. Then you add the code to delete all snapshots, that weren't meant to stay around.
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