From f91daf565b0e272a33bd3fcd19eaebd331c5cffd Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Sat, 15 Aug 2020 15:58:42 -0700 Subject: io_uring: short circuit -EAGAIN for blocking read attempt One case was missed in the short IO retry handling, and that's hitting -EAGAIN on a blocking attempt read (eg from io-wq context). This is a problem on sockets that are marked as non-blocking when created, they don't carry any REQ_F_NOWAIT information to help us terminate them instead of perpetually retrying. Fixes: 227c0c9673d8 ("io_uring: internally retry short reads") Signed-off-by: Jens Axboe --- fs/io_uring.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index cb030912bf5e..dc506b75659c 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3186,6 +3186,8 @@ static int io_read(struct io_kiocb *req, bool force_nonblock, ret = 0; goto out_free; } else if (ret == -EAGAIN) { + if (!force_nonblock) + goto done; ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false); if (ret) goto out_free; @@ -3195,7 +3197,8 @@ static int io_read(struct io_kiocb *req, bool force_nonblock, } /* read it all, or we did blocking attempt. no retry. */ - if (!iov_iter_count(iter) || !force_nonblock) + if (!iov_iter_count(iter) || !force_nonblock || + (req->file->f_flags & O_NONBLOCK)) goto done; io_size -= ret; -- cgit v1.2.3