io_uring NVMe passthru currently receives the NVMe status and result in
the blk-mq request completion callback nvme_uring_cmd_end_io() but
doesn't post the io_uring CQE until the io_uring task work callback
nvme_uring_task_cb(). The status and result must be plumbed through
struct nvme_uring_cmd_pdu, taking up 16 bytes of the 32 available.

Store the status and result on the io_uring request in
nvme_uring_cmd_end_io() instead of nvme_uring_task_cb() so it doesn't
need to be passed through struct nvme_uring_cmd_pdu.

Caleb Sander Mateos (2):
  io_uring/cmd: split io_uring_cmd_set_res() from io_uring_cmd_done()
  nvme/ioctl: call io_uring_cmd_set_res32() in ->end_io()

 block/ioctl.c                | 10 ++++++----
 drivers/block/ublk_drv.c     | 26 ++++++++++++++++++--------
 drivers/nvme/host/ioctl.c    | 19 +++++++++----------
 drivers/scsi/scsi_bsg.c      |  4 ++--
 fs/btrfs/ioctl.c             |  3 ++-
 fs/fuse/dev_uring.c          | 15 ++++++++++-----
 include/linux/io_uring/cmd.h | 29 +++++++++++++----------------
 io_uring/uring_cmd.c         | 34 ++++++++++++++++++++++------------
 8 files changed, 82 insertions(+), 58 deletions(-)

-- 
2.55.0