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io_uring: don't do async setup for links' heads 

Now, as we can do async setup without holding an SQE, we can skip doing
io_req_defer_prep() for link heads, it will be tried to be executed
inline and follows all the rules of the non-linked requests.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-02-18 18:29:46 +00:00 committed by Jens Axboe
parent be7053b7d0
commit 1ee43ba8d2
1 changed files with 0 additions and 3 deletions
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3
fs/io_uring.c
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@ -6820,9 +6820,6 @@ static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
ctx->drain_next = 0;
}
if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) {
ret = io_req_defer_prep(req);
if (unlikely(ret))
req->flags |= REQ_F_FAIL_LINK;
link->head = req;
link->last = req;
} else {