Btrfs progs pre-release 4.9-rc2

Hi,

a pre-release has been tagged, fixes some problems with receive found by fstests.

ETA for 4.9 is in +2 days (2016-12-22).

Tarballs: https://www.kernel.org/pub/linux/kernel/people/kdave/btrfs-progs/
Git: git://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git