Merge tag 'for-5.16/io_uring-2021-10-29' of git://git.kernel.dk/linux-block

Pull io_uring updates from Jens Axboe:
 "Light on new features - basically just the hybrid mode support.

  Outside of that it's just fixes, cleanups, and performance
  improvements.

  In detail:

   - Add ring related information to the fdinfo output (Hao)

   - Hybrid async mode (Hao)

   - Support for batched issue on block (me)

   - sqe error trace improvement (me)

   - IOPOLL efficiency improvements (Pavel)

   - submit state cleanups and improvements (Pavel)

   - Completion side improvements (Pavel)

   - Drain improvements (Pavel)

   - Buffer selection cleanups (Pavel)

   - Fixed file node improvements (Pavel)

   - io-wq setup cancelation fix (Pavel)

   - Various other performance improvements and cleanups (Pavel)

   - Misc fixes (Arnd, Bixuan, Changcheng, Hao, me, Noah)"

* tag 'for-5.16/io_uring-2021-10-29' of git://git.kernel.dk/linux-block: (97 commits)
  io-wq: remove worker to owner tw dependency
  io_uring: harder fdinfo sq/cq ring iterating
  io_uring: don't assign write hint in the read path
  io_uring: clusterise ki_flags access in rw_prep
  io_uring: kill unused param from io_file_supports_nowait
  io_uring: clean up timeout async_data allocation
  io_uring: don't try io-wq polling if not supported
  io_uring: check if opcode needs poll first on arming
  io_uring: clean iowq submit work cancellation
  io_uring: clean io_wq_submit_work()'s main loop
  io-wq: use helper for worker refcounting
  io_uring: implement async hybrid mode for pollable requests
  io_uring: Use ERR_CAST() instead of ERR_PTR(PTR_ERR())
  io_uring: split logic of force_nonblock
  io_uring: warning about unused-but-set parameter
  io_uring: inform block layer of how many requests we are submitting
  io_uring: simplify io_file_supports_nowait()
  io_uring: combine REQ_F_NOWAIT_{READ,WRITE} flags
  io_uring: arm poll for non-nowait files
  fs/io_uring: Prioritise checking faster conditions first in io_write
  ...

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