selftests/landlock: Don't create useless file layouts

Add and use a layout0 test fixture to not populate the tmpfs filesystem
if it is not required for tests: unknown_access_rights, proc_nsfs,
unpriv and max_layers.

This doesn't change these tests but it speeds up their setup and makes
them less prone to error.  This prepare the ground for a next commit.

Link: https://lore.kernel.org/r/20230612191430.339153-3-mic@digikod.net
Signed-off-by: Mickaël Salaün <mic@digikod.net>

diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
index b6c4be3..0438651 100644 (file)
--- a/tools/testing/selftests/landlock/fs_test.c
+++ b/tools/testing/selftests/landlock/fs_test.c
@@ -231,6 +231,20 @@ static void cleanup_layout(struct __test_metadata *const _metadata)
        EXPECT_EQ(0, remove_path(TMP_DIR));
 }
 
+/* clang-format off */
+FIXTURE(layout0) {};
+/* clang-format on */
+
+FIXTURE_SETUP(layout0)
+{
+       prepare_layout(_metadata);
+}
+
+FIXTURE_TEARDOWN(layout0)
+{
+       cleanup_layout(_metadata);
+}
+
 static void create_layout1(struct __test_metadata *const _metadata)
 {
        create_file(_metadata, file1_s1d1);
@@ -510,7 +524,7 @@ TEST_F_FORK(layout1, file_and_dir_access_rights)
        ASSERT_EQ(0, close(ruleset_fd));
 }
 
-TEST_F_FORK(layout1, unknown_access_rights)
+TEST_F_FORK(layout0, unknown_access_rights)
 {
        __u64 access_mask;
 
@@ -608,7 +622,7 @@ static void enforce_ruleset(struct __test_metadata *const _metadata,
        }
 }
 
-TEST_F_FORK(layout1, proc_nsfs)
+TEST_F_FORK(layout0, proc_nsfs)
 {
        const struct rule rules[] = {
                {
@@ -657,11 +671,11 @@ TEST_F_FORK(layout1, proc_nsfs)
        ASSERT_EQ(0, close(path_beneath.parent_fd));
 }
 
-TEST_F_FORK(layout1, unpriv)
+TEST_F_FORK(layout0, unpriv)
 {
        const struct rule rules[] = {
                {
-                       .path = dir_s1d2,
+                       .path = TMP_DIR,
                        .access = ACCESS_RO,
                },
                {},
@@ -1301,12 +1315,12 @@ TEST_F_FORK(layout1, inherit_superset)
        ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY));
 }
 
-TEST_F_FORK(layout1, max_layers)
+TEST_F_FORK(layout0, max_layers)
 {
        int i, err;
        const struct rule rules[] = {
                {
-                       .path = dir_s1d2,
+                       .path = TMP_DIR,
                        .access = ACCESS_RO,
                },
                {},