Merge branch 'for-linus' of git://

Pull btrfs fix from Chris Mason:
 "Sage hit a deadlock with ceph on btrfs, and Josef tracked it down to a
  regression in our initial rc1 pull.  When doing nocow writes we were
  sometimes starting a transaction with locks held"

* 'for-linus' of git://
  Btrfs: release path before starting transaction in can_nocow_extent