[LTP] [PATCH v4] io_submit04: Add test case for RWF_NOWAIT flag

Wei Gao via ltp
2026-01-07T06:10:36Z

Fixes: #467
Signed-off-by: Wei Gao <wegao@suse.com>
---
configure.ac | 1 +
include/lapi/aio_abi.h | 44 +++++++++
runtest/syscalls | 1 +
.../kernel/syscalls/io_submit/.gitignore | 1 +
.../kernel/syscalls/io_submit/io_submit04.c | 94 +++++++++++++++++++
5 files changed, 141 insertions(+)
create mode 100644 include/lapi/aio_abi.h
create mode 100644 testcases/kernel/syscalls/io_submit/io_submit04.c

diff --git a/configure.ac b/configure.ac
index a0ebbb34d..ee46e3f24 100644
--- a/configure.ac
+++ b/configure.ac
@@ -172,6 +172,7 @@ AC_CHECK_FUNCS_ONCE([ \
])
AC_CHECK_FUNCS(mkdtemp,[],AC_MSG_ERROR(mkdtemp() not found!))

+AC_CHECK_MEMBERS([struct iocb.aio_rw_flags],,,[#include <linux/aio_abi.h>])
AC_CHECK_MEMBERS([struct fanotify_event_info_fid.fsid.__val],,,[#include <sys/fanotify.h>])
AC_CHECK_MEMBERS([struct perf_event_mmap_page.aux_head],,,[#include <linux/perf_event.h>])
AC_CHECK_MEMBERS([struct sigaction.sa_sigaction],[],[],[#include <signal.h>])
diff --git a/include/lapi/aio_abi.h b/include/lapi/aio_abi.h
new file mode 100644
index 000000000..bd8c2965b
--- /dev/null
+++ b/include/lapi/aio_abi.h
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2025 Wei Gao <wegao@suse.com>
+ */
+
+#ifndef LAPI_AIO_ABI_H__
+#define LAPI_AIO_ABI_H__
+
+#include <endian.h>
+#include <linux/aio_abi.h>
+
+#ifndef RWF_NOWAIT
+# define RWF_NOWAIT 0x00000008
+#endif
+
+struct iocb_fallback {
+ uint64_t aio_data;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ uint32_t aio_key;
+ uint32_t aio_rw_flags;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+ uint32_t aio_rw_flags;
+ uint32_t aio_key;
+#else
+#error edit for your odd byteorder.
+#endif
+ uint16_t aio_lio_opcode;
+ int16_t aio_reqprio;
+ uint32_t aio_fildes;
+ uint64_t aio_buf;
+ uint64_t aio_nbytes;
+ int64_t aio_offset;
+ uint64_t aio_reserved2;
+ uint32_t aio_flags;
+ uint32_t aio_resfd;
+};
+
+#ifndef HAVE_STRUCT_IOCB_AIO_RW_FLAGS
+typedef struct iocb_fallback iocb;
+#else
+typedef struct iocb iocb;
+#endif
+
+#endif /* LAPI_AIO_ABI_H__ */
diff --git a/runtest/syscalls b/runtest/syscalls
index a1ef7548b..18182a2d6 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -696,6 +696,7 @@ 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..d085d3238
--- /dev/null
+++ b/testcases/kernel/syscalls/io_submit/io_submit04.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2025 Wei Gao <wegao@suse.com>
+ */
+
+/*\
+ * Test RWF_NOWAIT support in io_submit(), verifying that an
+ * asynchronous read operation on a blocking resource (empty pipe)
+ * will cause -EAGAIN. This is done by checking that io_getevents()
+ * syscall returns immediately and io_event.res is equal to -EAGAIN.
+ */
+
+#include "config.h"
+#include "tst_test.h"
+#include "lapi/syscalls.h"
+#include "lapi/aio_abi.h"
+
+
+#define BUF_SIZE 100
+
+static int fd[2];
+
+static aio_context_t ctx;
+static char *buf;
+static iocb *cb;
+static iocb **iocbs;
+
+static void setup(void)
+{
+ TST_EXP_PASS_SILENT(tst_syscall(__NR_io_setup, 1, &ctx));
+ SAFE_PIPE(fd);
+
+ cb->aio_fildes = fd[0];
+ cb->aio_lio_opcode = IOCB_CMD_PREAD;
+ cb->aio_buf = (uint64_t)buf;
+ cb->aio_offset = 0;
+ cb->aio_nbytes = BUF_SIZE;
+ cb->aio_rw_flags = RWF_NOWAIT;
+
+ iocbs[0] = cb;
+}
+
+static void cleanup(void)
+{
+ if (fd[0])
+ SAFE_CLOSE(fd[0]);
+
+ if (fd[1])
+ SAFE_CLOSE(fd[1]);
+
+ if (ctx)
+ 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 == -1 && errno == EOPNOTSUPP) {
+ tst_brk(TCONF, "RWF_NOWAIT not supported by kernel");
+ } else if (TST_RET != nr) {
+ tst_brk(TBROK | 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(TPASS, "io_getevents() returned EAGAIN on read event");
+ else
+ tst_res(TFAIL | TTERRNO, "io_getevents() returned with %s instead of EAGAIN",
+ strerror(-evbuf.res));
+}
+
+static struct tst_test test = {
+ .test_all = run,
+ .setup = setup,
+ .cleanup = cleanup,
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_AIO=y",
+ NULL
+ },
+ .bufs = (struct tst_buffers []) {
+ {&buf, .size = BUF_SIZE},
+ {&cb, .size = sizeof(iocb)},
+ {&iocbs, .size = sizeof(iocb *)},
+ {},
+ }
+};
--
2.52.0