init_ino_test.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2// Copyright (c) 2025 Christian Brauner <brauner@kernel.org>
 3
 4#define _GNU_SOURCE
 5#include <fcntl.h>
 6#include <stdio.h>
 7#include <stdlib.h>
 8#include <sys/stat.h>
 9#include <unistd.h>
10#include <errno.h>
11#include <string.h>
12#include <linux/nsfs.h>
13
14#include "kselftest_harness.h"
15
16struct ns_info {
17	const char *name;
18	const char *proc_path;
19	unsigned int expected_ino;
20};
21
22static struct ns_info namespaces[] = {
23	{ "ipc", "/proc/1/ns/ipc", IPC_NS_INIT_INO },
24	{ "uts", "/proc/1/ns/uts", UTS_NS_INIT_INO },
25	{ "user", "/proc/1/ns/user", USER_NS_INIT_INO },
26	{ "pid", "/proc/1/ns/pid", PID_NS_INIT_INO },
27	{ "cgroup", "/proc/1/ns/cgroup", CGROUP_NS_INIT_INO },
28	{ "time", "/proc/1/ns/time", TIME_NS_INIT_INO },
29	{ "net", "/proc/1/ns/net", NET_NS_INIT_INO },
30	{ "mnt", "/proc/1/ns/mnt", MNT_NS_INIT_INO },
31};
32
33TEST(init_namespace_inodes)
34{
35	struct stat st;
36
37	for (int i = 0; i < sizeof(namespaces) / sizeof(namespaces[0]); i++) {
38		int ret = stat(namespaces[i].proc_path, &st);
39
40		/* Some namespaces might not be available (e.g., time namespace on older kernels) */
41		if (ret < 0) {
42			if (errno == ENOENT) {
43				ksft_test_result_skip("%s namespace not available\n",
44						      namespaces[i].name);
45				continue;
46			}
47			ASSERT_GE(ret, 0)
48			TH_LOG("Failed to stat %s: %s",
49			       namespaces[i].proc_path, strerror(errno));
50		}
51
52		ASSERT_EQ(st.st_ino, namespaces[i].expected_ino)
53			TH_LOG("Namespace %s has inode 0x%lx, expected 0x%x",
54			       namespaces[i].name, st.st_ino, namespaces[i].expected_ino);
55
56		ksft_print_msg("Namespace %s: inode 0x%lx matches expected 0x%x\n",
57			       namespaces[i].name, st.st_ino, namespaces[i].expected_ino);
58	}
59}
60
61TEST_HARNESS_MAIN