io/uring/Ring: Mark the io_uring as non-iowait%

Linux 6.15 introduced io_uring_set_iowait(3) which allows user to
disable the wa% on waiting io_uring.

The error code is intentionally ignored, as the function call will fail
on earlier Linux system, and a macro guard is added to allow build to
succeed on liburing < 2.10.

This commit fixes #2241.

Author: jackyyf

src/io/uring/Ring.cxx

@@ -12,13 +12,21 @@ Ring::Ring(unsigned entries, unsigned flags)
 	if (int error = io_uring_queue_init(entries, &ring, flags);
 	    error < 0)
 		throw MakeErrno(-error, "io_uring_queue_init() failed");
+#if !IO_URING_CHECK_VERSION(2, 10)
+	// Intentionally ignore the error code, as this is only supported on Linux 6.15+
+	(void) io_uring_set_iowait(&ring, false);
+#endif
 }
 
 Ring::Ring(unsigned entries, struct io_uring_params &params)
 {
 	if (int error = io_uring_queue_init_params(entries, &ring, &params);
 	    error < 0)
 		throw MakeErrno(-error, "io_uring_queue_init_params() failed");
+#if !IO_URING_CHECK_VERSION(2, 10)
+	// Intentionally ignore the error code, as this is only supported on Linux 6.15+
+	(void) io_uring_set_iowait(&ring, false);
+#endif
 }
 
 void