Pull Ceph fixes form Sage Weil:
 "There are two fixes in the messenger code, one that can trigger a NULL
  dereference, and one that error in refcounting (extra put).  There is
  also a trivial fix that in the fs client code that is triggered by NFS
  reexport."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  ceph: fix dentry reference leak in encode_fh()
  libceph: avoid NULL kref_put when osd reset races with alloc_msg
  rbd: reset BACKOFF if unable to re-queue