Merge tag 'for-6.15/io_uring-reg-vec-20250327' of git://git.kernel.dk/linux

Pull more io_uring updates from Jens Axboe:
 "Final separate updates for io_uring.

  This started out as a series of cleanups improvements and improvements
  for registered buffers, but as the last series of the io_uring changes
  for 6.15, it also collected a few fixes for the other branches on top:

   - Add support for vectored fixed/registered buffers.

     Previously only single segments have been supported for commands,
     now vectored variants are supported as well. This series includes
     networking and file read/write support.

   - Small series unifying return codes across multi and single shot.

   - Small series cleaning up registerd buffer importing.

   - Adding support for vectored registered buffers for uring_cmd.

   - Fix for io-wq handling of command reissue.

   - Various little fixes and tweaks"

* tag 'for-6.15/io_uring-reg-vec-20250327' of git://git.kernel.dk/linux: (25 commits)
  io_uring/net: fix io_req_post_cqe abuse by send bundle
  io_uring/net: use REQ_F_IMPORT_BUFFER for send_zc
  io_uring: move min_events sanitisation
  io_uring: rename "min" arg in io_iopoll_check()
  io_uring: open code __io_post_aux_cqe()
  io_uring: defer iowq cqe overflow via task_work
  io_uring: fix retry handling off iowq
  io_uring/net: only import send_zc buffer once
  io_uring/cmd: introduce io_uring_cmd_import_fixed_vec
  io_uring/cmd: add iovec cache for commands
  io_uring/cmd: don't expose entire cmd async data
  io_uring: rename the data cmd cache
  io_uring: rely on io_prep_reg_vec for iovec placement
  io_uring: introduce io_prep_reg_iovec()
  io_uring: unify STOP_MULTISHOT with IOU_OK
  io_uring: return -EAGAIN to continue multishot
  io_uring: cap cached iovec/bvec size
  io_uring/net: implement vectored reg bufs for zctx
  io_uring/net: convert to struct iou_vec
  io_uring/net: pull vec alloc out of msghdr import
  ...

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