The Btrfs activity for the Linux 4.9 kernel merge window includes "a big variety of fixes and cleanups," according to Mason. There is unfortunately not any standout new features or breakthrough discoveries to find with Btrfs on Linux 4.9.
Mason did note though that there are some prep changes for a bigger set of extent buffer changes, which Josef Bacik has been working on and is aiming to get those underlying changes ready for Linux 4.10.
More details on the Btrfs changes for Linux 4.9 via this pull request.
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