Last week Mason sent in the main Btrfs pull request for 4.11 and it basically amounted to fixes. With the secondary pull request mailed in on Thursday, there are more fixes and performance improvements.
This second update continues a few dozen changes by Nikolay Borisov, David Sterba, Filipe Manana, and Robbie Ko. As usual, I'll have my cross file-system benchmarks for the new kernel as the Linux 4.11 code stabilizes.
More details on the second round of Btrfs fixes/optimizations via this pull request.