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io_uring: remove setting REQ_F_MUST_PUNT in rw 

io_{read,write}() {
	...
copy_iov: // prep async
  	if (!(flags & REQ_F_NOWAIT) && !file_can_poll(file))
		flags |= REQ_F_MUST_PUNT;
}

REQ_F_MUST_PUNT there is pointless, because if it happens then
REQ_F_NOWAIT is known to be _not_ set, and the request will go
async path in __io_queue_sqe() anyway. file_can_poll() check
is also repeated in arm_poll*(), so don't need it.

Remove the mentioned assignment REQ_F_MUST_PUNT in preparation
for killing the flag.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-06-21 13:09:50 +03:00 committed by Jens Axboe
parent 895aa7b1a0
commit 62ef731650
1 changed files with 0 additions and 8 deletions
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8
fs/io_uring.c
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@ -2920,10 +2920,6 @@ copy_iov:
inline_vecs, &iter);
if (ret)
goto out_free;
/* any defer here is final, must blocking retry */
if (!(req->flags & REQ_F_NOWAIT) &&
!file_can_poll(req->file))
req->flags |= REQ_F_MUST_PUNT;
/* if we can retry, do so with the callbacks armed */
if (io_rw_should_retry(req)) {
ret2 = io_iter_do_read(req, &iter);
@ -3057,10 +3053,6 @@ copy_iov:
inline_vecs, &iter);
if (ret)
goto out_free;
/* any defer here is final, must blocking retry */
if (!(req->flags & REQ_F_NOWAIT) &&
!file_can_poll(req->file))
req->flags |= REQ_F_MUST_PUNT;
return -EAGAIN;
}
}