io_uring: highlight read-retry loop

We already have implicit do-while for read-retries but with goto in the
end. Convert it to an actual do-while, it highlights it so making a
bit more understandable and is cleaner in general.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -3566,7 +3566,8 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 	rw = req->async_data;
 	/* now use our persistent iterator, if we aren't already */
 	iter = &rw->iter;
-retry:
+
+	do {
 		io_size -= ret;
 		rw->bytes_done += ret;
 		/* if we can retry, do so with the callbacks armed */
@@ -3576,17 +3577,16 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 		}
 
 		/*
-	 * Now retry read with the IOCB_WAITQ parts set in the iocb. If we
-	 * get -EIOCBQUEUED, then we'll get a notification when the desired
-	 * page gets unlocked. We can also get a partial read here, and if we
-	 * do, then just retry at the new offset.
+		 * Now retry read with the IOCB_WAITQ parts set in the iocb. If
+		 * we get -EIOCBQUEUED, then we'll get a notification when the
+		 * desired page gets unlocked. We can also get a partial read
+		 * here, and if we do, then just retry at the new offset.
 		 */
 		ret = io_iter_do_read(req, iter);
 		if (ret == -EIOCBQUEUED)
 			return 0;
 		/* we got some bytes, but not all. retry. */
-	if (ret > 0 && ret < io_size)
-		goto retry;
+	} while (ret > 0 && ret < io_size);
 done:
 	kiocb_done(kiocb, ret, cs);
 	return 0;