[LTP] [PATCH v2 2/4] syscalls/statx10: Add basic test for STATX_DIOALIGN on regular file

[Yang Xu]

STATX_DIOALIGN is used to get stx_dio_mem_align and stx_dio_offset_align
for files on fs that support direct io. We just check whether these
value are nonzero on ext4 and xfs.

For struct statx member check, we only check stx_dio_mem_align because
these two member is introduced toger in separate commit in kernel, so it is
safe.

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
---
 configure.ac                               |  2 +-
 runtest/syscalls                           |  1 +
 testcases/kernel/syscalls/statx/.gitignore |  1 +
 testcases/kernel/syscalls/statx/statx10.c  | 84 ++++++++++++++++++++++
 4 files changed, 87 insertions(+), 1 deletion(-)
 create mode 100644 testcases/kernel/syscalls/statx/statx10.c

diff --git a/configure.ac b/configure.ac
index 4c8763376..548288310 100644
--- a/configure.ac
+++ b/configure.ac
@@ -158,7 +158,7 @@ AC_CHECK_FUNCS(mkdtemp,[],AC_MSG_ERROR(mkdtemp() not found!))
 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>])
-AC_CHECK_MEMBERS([struct statx.stx_mnt_id],,,[
+AC_CHECK_MEMBERS([struct statx.stx_mnt_id, struct statx.stx_dio_mem_align],,,[
 #define _GNU_SOURCE
 #include <sys/stat.h>
 ])
diff --git a/runtest/syscalls b/runtest/syscalls
index 8b002e989..92123772c 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1769,6 +1769,7 @@ statx06 statx06
 statx07 statx07
 statx08 statx08
 statx09 statx09
+statx10 statx10
 
 membarrier01 membarrier01
 
diff --git a/testcases/kernel/syscalls/statx/.gitignore b/testcases/kernel/syscalls/statx/.gitignore
index 1cea43c0d..67341ff2d 100644
--- a/testcases/kernel/syscalls/statx/.gitignore
+++ b/testcases/kernel/syscalls/statx/.gitignore
@@ -7,3 +7,4 @@
 /statx07
 /statx08
 /statx09
+/statx10
diff --git a/testcases/kernel/syscalls/statx/statx10.c b/testcases/kernel/syscalls/statx/statx10.c
new file mode 100644
index 000000000..4307ada16
--- /dev/null
+++ b/testcases/kernel/syscalls/statx/statx10.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2023 FUJITSU LIMITED. All rights reserved.
+ * Author: Yang Xu <xuyang2018.jy@fujitsu.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * It is a basic test for STATX_DIOALIGN mask on ext4 and xfs filesystem.
+ *
+ * - STATX_DIOALIGN   Want stx_dio_mem_align and stx_dio_offset_align value
+ *
+ * Minimum Linux version required is v6.1.
+ */
+
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include "tst_test.h"
+#include "lapi/stat.h"
+
+#ifdef HAVE_STRUCT_STATX_STX_DIO_MEM_ALIGN
+#define MNTPOINT "mnt_point"
+#define TESTFILE "testfile"
+
+static int fd = -1;
+
+static void verify_statx(void)
+{
+	struct statx buf;
+
+	memset(&buf, 0, sizeof(buf));
+	TST_EXP_PASS(statx(AT_FDCWD, TESTFILE, 0, STATX_DIOALIGN, &buf),
+		"statx(AT_FDCWD, %s, 0, STATX_DIOALIGN, &buf)", TESTFILE);
+
+	if (!(buf.stx_mask & STATX_DIOALIGN)) {
+		tst_res(TCONF, "STATX_DIOALIGN is not supported until linux 6.1");
+		return;
+	}
+
+	if (buf.stx_dio_mem_align != 0)
+		tst_res(TPASS, "stx_dio_mem_align:%u", buf.stx_dio_mem_align);
+	else
+		tst_res(TFAIL, "don't get stx_dio_mem_align on supported dio fs");
+
+	if (buf.stx_dio_offset_align != 0)
+		tst_res(TPASS, "stx_dio_offset_align:%u", buf.stx_dio_offset_align);
+	else
+		tst_res(TFAIL, "don't get stx_dio_offset_align on supported dio fs");
+}
+
+static void setup(void)
+{
+	if (strcmp(tst_device->fs_type, "xfs") && strcmp(tst_device->fs_type, "ext4"))
+		tst_brk(TCONF, "This test only supports ext4 and xfs");
+
+	SAFE_FILE_PRINTF(TESTFILE, "AAAA");
+	fd = open(TESTFILE, O_RDWR | O_DIRECT);
+	if (fd == -1 && errno == EINVAL)
+		tst_brk(TCONF, "The regular file is not on a filesystem that support DIO");
+}
+
+static void cleanup(void)
+{
+	if (fd > -1)
+		SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+	.test_all = verify_statx,
+	.setup = setup,
+	.cleanup = cleanup,
+	.needs_root = 1,
+	.mntpoint = MNTPOINT,
+	.mount_device = 1,
+	.all_filesystems = 1,
+};
+#else
+TST_TEST_TCONF("test requires struct statx to have the stx_dio_mem_align fields");
+#endif
-- 
2.39.1