[PATCH v2 0/7] block/nvme: support nested aio_poll()

[Stefan Hajnoczi <stefanha@redhat.com>]

v2:
 * Reword comment in Patch 1 explainin why its safe not to hold q->lock [Sergio]
 * Fix s/unwiedly/unwieldy/ typo in the Patch 6 commit description [Philippe]

This series allows aio_poll() to work from I/O request completion callbacks.
QEMU block drivers are supposed to support this because some code paths rely on
this behavior.

There was no measurable performance difference with nested aio_poll() support.

This patch series also contains cleanups that I made while examining and
benchmarking the code.

Stefan Hajnoczi (7):
  block/nvme: poll queues without q->lock
  block/nvme: drop tautologous assertion
  block/nvme: don't access CQE after moving cq.head
  block/nvme: switch to a NVMeRequest freelist
  block/nvme: clarify that free_req_queue is protected by q->lock
  block/nvme: keep BDRVNVMeState pointer in NVMeQueuePair
  block/nvme: support nested aio_poll()

 block/nvme.c       | 220 ++++++++++++++++++++++++++++++++-------------
 block/trace-events |   2 +-
 2 files changed, 160 insertions(+), 62 deletions(-)

-- 
2.26.2