The Btrfs file-system changes in Linux 3.11 include the usual work on performance fixes, bug-fixes, and code-cleanups. There isn't anything too exciting about the Btrfs changes in this next Linux kernel release, but Chris Mason notes, "These are the usual mixture of bugs, cleanups and performance fixes. Miao has some really nice tuning of our crc code as well as our transaction commits. Josef is peeling off more and more problems related to early enospc, and has a number of important bug fixes in here too."
The pull request can be found on the Linux kernel mailing list.