[LTP] [PATCH v2] io_submit04: Add test case for RWF_NOWAIT flag

[Wei Gao]

Fixes: #467
Signed-off-by: Wei Gao <wegao@suse.com>
---
 runtest/syscalls                              |  1 +
 .../kernel/syscalls/io_submit/.gitignore      |  1 +
 .../kernel/syscalls/io_submit/io_submit04.c   | 87 +++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 testcases/kernel/syscalls/io_submit/io_submit04.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 4b284f279..655a46e91 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -693,6 +693,7 @@ io_setup02 io_setup02
 io_submit01 io_submit01
 io_submit02 io_submit02
 io_submit03 io_submit03
+io_submit04 io_submit04
 
 keyctl01 keyctl01
 keyctl02 keyctl02
diff --git a/testcases/kernel/syscalls/io_submit/.gitignore b/testcases/kernel/syscalls/io_submit/.gitignore
index 60b07970a..abe962e1c 100644
--- a/testcases/kernel/syscalls/io_submit/.gitignore
+++ b/testcases/kernel/syscalls/io_submit/.gitignore
@@ -1,3 +1,4 @@
 /io_submit01
 /io_submit02
 /io_submit03
+/io_submit04
diff --git a/testcases/kernel/syscalls/io_submit/io_submit04.c b/testcases/kernel/syscalls/io_submit/io_submit04.c
new file mode 100644
index 000000000..5c9c4065a
--- /dev/null
+++ b/testcases/kernel/syscalls/io_submit/io_submit04.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2025 Wei Gao <wegao@suse.com>
+ */
+
+/*\
+ * Test iocb RWF_* flags support: RWF_NOWAIT
+ *
+ * Checks if an asynchronous read operation with RWF_NOWAIT on a blocking
+ * resource (empty pipe) fails immediately with -EAGAIN.
+ */
+
+#include <linux/aio_abi.h>
+
+#include "config.h"
+#include "tst_test.h"
+#include "lapi/syscalls.h"
+
+static int fd[2];
+static char buf[100];
+
+static aio_context_t ctx;
+static struct iocb iocb;
+static struct iocb *iocbs[] = {&iocb};
+
+static inline void io_prep_option(struct iocb *cb, int fd, void *buf,
+			size_t count, long long offset, unsigned int opcode)
+{
+	memset(cb, 0, sizeof(*cb));
+	cb->aio_fildes = fd;
+	cb->aio_lio_opcode = opcode;
+	cb->aio_buf = (uint64_t)buf;
+	cb->aio_offset = offset;
+	cb->aio_nbytes = count;
+	cb->aio_rw_flags = RWF_NOWAIT;
+}
+
+static void setup(void)
+{
+	TST_EXP_PASS_SILENT(tst_syscall(__NR_io_setup, 1, &ctx));
+	SAFE_PIPE(fd);
+	io_prep_option(&iocb, fd[0], buf, sizeof(buf), 0, IOCB_CMD_PREAD);
+}
+
+static void cleanup(void)
+{
+	if (fd[0])
+		SAFE_CLOSE(fd[0]);
+
+	if (fd[1])
+		SAFE_CLOSE(fd[1]);
+
+	if (tst_syscall(__NR_io_destroy, ctx))
+		tst_brk(TBROK | TERRNO, "io_destroy() failed");
+}
+
+static void run(void)
+{
+	struct io_event evbuf;
+	struct timespec timeout = { .tv_sec = 1 };
+	long nr = 1;
+
+	TEST(tst_syscall(__NR_io_submit, ctx, nr, iocbs));
+
+	if (TST_RET == nr)
+		tst_res(TPASS, "io_submit() pass");
+	else
+		tst_res(TFAIL | TTERRNO, "io_submit() returns %ld, expected %ld", TST_RET, nr);
+
+	tst_syscall(__NR_io_getevents, ctx, 1, 1, &evbuf, &timeout);
+
+	if (evbuf.res == -EAGAIN)
+		tst_res(TINFO, "io_submit RWF_NOWAIT flag check pass");
+	else
+		tst_res(TFAIL | TTERRNO, "io_submit expect EAGAIN, but get %s", strerror(-evbuf.res));
+
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.needs_kconfigs = (const char *[]) {
+		"CONFIG_AIO=y",
+		NULL
+	},
+	.setup = setup,
+	.cleanup = cleanup,
+};
-- 
2.51.0