// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright (c) 2025 Christian Brauner <brauner@kernel.org>

#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <linux/nsfs.h>

#include "kselftest_harness.h"

struct ns_info {
        const char *name;
        const char *proc_path;
        unsigned int expected_ino;
};

static struct ns_info namespaces[] = {
        { "ipc", "/proc/1/ns/ipc", IPC_NS_INIT_INO },
        { "uts", "/proc/1/ns/uts", UTS_NS_INIT_INO },
        { "user", "/proc/1/ns/user", USER_NS_INIT_INO },
        { "pid", "/proc/1/ns/pid", PID_NS_INIT_INO },
        { "cgroup", "/proc/1/ns/cgroup", CGROUP_NS_INIT_INO },
        { "time", "/proc/1/ns/time", TIME_NS_INIT_INO },
        { "net", "/proc/1/ns/net", NET_NS_INIT_INO },
        { "mnt", "/proc/1/ns/mnt", MNT_NS_INIT_INO },
};

TEST(init_namespace_inodes)
{
        struct stat st;

        for (int i = 0; i < sizeof(namespaces) / sizeof(namespaces[0]); i++) {
                int ret = stat(namespaces[i].proc_path, &st);

                /* Some namespaces might not be available (e.g., time namespace on older kernels) */
                if (ret < 0) {
                        if (errno == ENOENT) {
                                ksft_test_result_skip("%s namespace not available\n",
                                                      namespaces[i].name);
                                continue;
                        }
                        ASSERT_GE(ret, 0)
                        TH_LOG("Failed to stat %s: %s",
                               namespaces[i].proc_path, strerror(errno));
                }

                ASSERT_EQ(st.st_ino, namespaces[i].expected_ino)
                        TH_LOG("Namespace %s has inode 0x%lx, expected 0x%x",
                               namespaces[i].name, st.st_ino, namespaces[i].expected_ino);

                ksft_print_msg("Namespace %s: inode 0x%lx matches expected 0x%x\n",
                               namespaces[i].name, st.st_ino, namespaces[i].expected_ino);
        }
}

TEST_HARNESS_MAIN