Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- Multi-threading fixes in several block drivers

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* tag 'for-upstream' of https://repo.or.cz/qemu/kevin:
  win32-aio: Run CB in original context
  null-aio: Run CB in original AioContext
  iscsi: Create AIO BH in original AioContext
  block: Note in which AioContext AIO CBs are called
  blkreplay: Run BH in coroutine’s AioContext
  ssh: Run restart_coroutine in current AioContext
  qcow2: Schedule cache-clean-timer in realtime
  qcow2: Fix cache_clean_timer
  qcow2: Re-initialize lock in invalidate_cache
  block/io: Take reqs_lock for tracked_requests
  nvme: Note in which AioContext some functions run
  nvme: Fix coroutine waking
  nvme: Kick and check completions in BDS context
  gluster: Do not move coroutine into BDS context
  curl: Fix coroutine waking
  nfs: Run co BH CB in the coroutine’s AioContext
  iscsi: Run co BH CB in the coroutine’s AioContext
  rbd: Run co BH CB in the coroutine’s AioContext
  block: Note on aio_co_wake use if not yet yielding

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>