[PATCH v2 0/2] async hybrid for pollable requests

[Hao Xu <haoxu@linux.alibaba.com>]

1/2 is a prep patch. 2/2 is the main one.
The good thing: see commit message.
the side effect: for normal io-worker path, added two if and two local
variables. for FORCE_ASYNC path, added three if and several dereferences

I think it is fine since the io-worker path is not the fast path, and
the benefit of this patchset is worth it.

Btw, we need to tweak the io-cancel.c a bit, not a big problem.
liburing tests will come later.

v1-->v2:
 - split logic of force_nonblock
 - tweak added code in io_wq_submit_work to reduce overhead
 from Pavel's commments.

Hao Xu (2):
  io_uring: split logic of force_nonblock
  io_uring: implement async hybrid mode for pollable requests

 fs/io_uring.c                 | 85 ++++++++++++++++++++++++++---------
 include/uapi/linux/io_uring.h |  4 +-
 2 files changed, 66 insertions(+), 23 deletions(-)

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2.24.4