1 files changed, 49 insertions, 0 deletions
diff --git a/src/kernel/tests/lib/tst_fs_setup.c b/src/kernel/tests/lib/tst_fs_setup.c
new file mode 100644
index 0000000..54ea370
--- /dev/null
+++ b/src/kernel/tests/lib/tst_fs_setup.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <dirent.h>
+#include <errno.h>
+#include <sys/mount.h>
+
+#define TST_NO_DEFAULT_MAIN
+#include "tst_test.h"
+#include "tst_fs.h"
+
+#define TST_FS_SETUP_OVERLAYFS_MSG "overlayfs is not configured in this kernel"
+#define TST_FS_SETUP_OVERLAYFS_CONFIG "lowerdir="OVL_LOWER",upperdir="OVL_UPPER",workdir="OVL_WORK
+
+void create_overlay_dirs(void)
+{
+	DIR *dir = opendir(OVL_LOWER);
+	if (dir == NULL) {
+		SAFE_MKDIR(OVL_LOWER, 0755);
+		SAFE_MKDIR(OVL_UPPER, 0755);
+		SAFE_MKDIR(OVL_WORK, 0755);
+		SAFE_MKDIR(OVL_MNT, 0755);
+		return;
+	}
+	closedir(dir);
+}
+
+int mount_overlay(const char *file, const int lineno, int skip)
+{
+	int ret;
+
+	create_overlay_dirs();
+	ret = mount("overlay", OVL_MNT, "overlay", 0,
+				TST_FS_SETUP_OVERLAYFS_CONFIG);
+	if (ret == 0)
+		return 0;
+
+	if (errno == ENODEV) {
+		if (skip) {
+			tst_brk(TCONF, "%s:%d: " TST_FS_SETUP_OVERLAYFS_MSG,
+				file, lineno);
+		} else {
+			tst_res(TINFO, "%s:%d: " TST_FS_SETUP_OVERLAYFS_MSG,
+				file, lineno);
+		}
+	} else {
+		tst_brk(TBROK | TERRNO, "overlayfs mount failed");
+	}
+	return ret;
+}