io_uring: allow O_NONBLOCK async retry
We can assume that O_NONBLOCK is always honored, even if we don't have a ->read/write_iter() for the file type. Also unify the read/write checking for allowing async punt, having the write side factoring in the REQ_F_NOWAIT flag as well. Cc: stable@vger.kernel.org Fixes: 490e8967 ("io_uring: only force async punt if poll based retry can't handle it") Signed-off-by: NJens Axboe <axboe@kernel.dk>
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