tools/testing/selftests/bpf/prog_tests/test_bpffs.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/test_bpffs.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/test_bpffs.c
Extension
.c
Size
4334 bytes
Lines
165
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (strstr(buf, "iter")) {
			close(fd);
			return 0;
		}
	}
	close(fd);
	return -1;
}

static int fn(void)
{
	struct stat a, b, c;
	int err, map;

	err = unshare(CLONE_NEWNS);
	if (!ASSERT_OK(err, "unshare"))
		goto out;

	err = mount("", "/", "", MS_REC | MS_PRIVATE, NULL);
	if (!ASSERT_OK(err, "mount /"))
		goto out;

	err =  mkdir(TDIR, 0777);
	/* If the directory already exists we can carry on. It may be left over
	 * from a previous run.
	 */
	if ((err && errno != EEXIST) && !ASSERT_OK(err, "mkdir " TDIR))
		goto out;

	err = mount("none", TDIR, "tmpfs", 0, NULL);
	if (!ASSERT_OK(err, "mount tmpfs"))
		goto out;

	err = mkdir(TDIR "/fs1", 0777);
	if (!ASSERT_OK(err, "mkdir " TDIR "/fs1"))
		goto out;
	err = mkdir(TDIR "/fs2", 0777);
	if (!ASSERT_OK(err, "mkdir " TDIR "/fs2"))
		goto out;

	err = mount("bpf", TDIR "/fs1", "bpf", 0, NULL);
	if (!ASSERT_OK(err, "mount bpffs " TDIR "/fs1"))
		goto out;
	err = mount("bpf", TDIR "/fs2", "bpf", 0, NULL);
	if (!ASSERT_OK(err, "mount bpffs " TDIR "/fs2"))
		goto out;

	err = read_iter(TDIR "/fs1/maps.debug");
	if (!ASSERT_OK(err, "reading " TDIR "/fs1/maps.debug"))
		goto out;
	err = read_iter(TDIR "/fs2/progs.debug");
	if (!ASSERT_OK(err, "reading " TDIR "/fs2/progs.debug"))
		goto out;

	err = mkdir(TDIR "/fs1/a", 0777);
	if (!ASSERT_OK(err, "creating " TDIR "/fs1/a"))
		goto out;
	err = mkdir(TDIR "/fs1/a/1", 0777);
	if (!ASSERT_OK(err, "creating " TDIR "/fs1/a/1"))
		goto out;
	err = mkdir(TDIR "/fs1/b", 0777);
	if (!ASSERT_OK(err, "creating " TDIR "/fs1/b"))
		goto out;

	map = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 4, 1, NULL);
	if (!ASSERT_GT(map, 0, "create_map(ARRAY)"))
		goto out;
	err = bpf_obj_pin(map, TDIR "/fs1/c");
	if (!ASSERT_OK(err, "pin map"))
		goto out;
	close(map);

	/* Check that RENAME_EXCHANGE works for directories. */
	err = stat(TDIR "/fs1/a", &a);
	if (!ASSERT_OK(err, "stat(" TDIR "/fs1/a)"))
		goto out;
	err = renameat2(0, TDIR "/fs1/a", 0, TDIR "/fs1/b", RENAME_EXCHANGE);
	if (!ASSERT_OK(err, "renameat2(/fs1/a, /fs1/b, RENAME_EXCHANGE)"))
		goto out;
	err = stat(TDIR "/fs1/b", &b);
	if (!ASSERT_OK(err, "stat(" TDIR "/fs1/b)"))
		goto out;
	if (!ASSERT_EQ(a.st_ino, b.st_ino, "b should have a's inode"))
		goto out;
	err = access(TDIR "/fs1/b/1", F_OK);
	if (!ASSERT_OK(err, "access(" TDIR "/fs1/b/1)"))
		goto out;

	/* Check that RENAME_EXCHANGE works for mixed file types. */
	err = stat(TDIR "/fs1/c", &c);

Annotation

Implementation Notes