dotcloud/docker — pull request #6261 by unclejack (2014-06-07 23:47:26+00:00)
Title: improve commit performance for btrfs

This PR optimizes commit for btrfs so that Docker is using btrfs snapshotting.

This speeds up the final commit during `make build` from 1.6s to 0.007s on a system. It also removes the need to read and write any data during commit if we're using btrfs.