io_uring: refactor io_req_defer()
Rename io_req_defer() into io_drain_req() and refactor it uncoupling it from io_queue_sqe() error handling and preparing for coming optimisations. Also, prioritise non IOSQE_ASYNC path. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/4f17dd56e7fbe52d1866f8acd8efe3284d2bebcb.1623709150.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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