Merge branch 'work.aio' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Merge branch 'work.aio' of git://git./linux/kernel/git/viro/vfs

Pull vfs aio updates from Al Viro:
 "Christoph's aio poll, saner this time around.

  This time it's pretty much local to fs/aio.c. Hopefully race-free..."

* 'work.aio' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  aio: allow direct aio poll comletions for keyed wakeups
  aio: implement IOCB_CMD_POLL
  aio: add a iocb refcount
  timerfd: add support for keyed wakeups