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io_uring: don't try io-wq polling if not supported

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If an opcode doesn't support polling, just let it be executed
synchronously in iowq, otherwise it will do a nonblock attempt just to
fail in io_arm_poll_handler() and return back to blocking execution.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/6401256db01b88f448f15fcd241439cb76f5b940.1634987320.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-23 12:13:59 +01:00 committed by Jens Axboe
parent 658d0a4016
commit afb7f56fc6
1 changed files with 6 additions and 2 deletions
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8
fs/io_uring.c
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@ -6741,9 +6741,13 @@ static void io_wq_submit_work(struct io_wq_work *work)
}
if (req->flags & REQ_F_FORCE_ASYNC) {
needs_poll = req->file && file_can_poll(req->file);
if (needs_poll)
const struct io_op_def *def = &io_op_defs[req->opcode];
bool opcode_poll = def->pollin || def->pollout;
if (opcode_poll && file_can_poll(req->file)) {
needs_poll = true;
issue_flags |= IO_URING_F_NONBLOCK;
}
}
do {