// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) Zilogic Systems Pvt. Ltd., 2018
 * Email: code@zilogic.com
 */

/*\
 * [Description]
 *
 * This code tests the functionality of statx system call.
 *
 * The metadata for normal file are tested against expected values:
 *
 * - gid
 * - uid
 * - mode
 * - blocks
 * - size
 * - nlink
 * - mnt_id
 *
 * The metadata for device file are tested against expected values:
 *
 * - MAJOR number
 * - MINOR number
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/sysmacros.h>
#include "tst_test.h"
#include "tst_safe_macros.h"
#include "lapi/stat.h"
#include "tst_safe_stdio.h"
#include <string.h>
#include <inttypes.h>

#define TESTFILE "test_file"
#define MNTPOINT "mntpoint/"
#define DEVICEFILE MNTPOINT"blk_dev"
#define MODE 0644

#define SIZE 256
#define MAJOR 8
#define MINOR 1

static int file_fd = -1;

#ifdef HAVE_STRUCT_STATX_STX_MNT_ID
static void test_mnt_id(struct statx *buf)
{
	FILE *file;
	char line[PATH_MAX];
	int pid;
	unsigned int line_mjr, line_mnr;
	uint64_t mnt_id;

	if (!(buf->stx_mask & STATX_MNT_ID)) {
		tst_res(TCONF, "stx_mnt_id is not supported until linux 5.8");
		return;
	}

	file = SAFE_FOPEN("/proc/self/mountinfo", "r");

	while (fgets(line, sizeof(line), file)) {
		if (sscanf(line, "%ld %*d %d:%d", &mnt_id, &line_mjr, &line_mnr) != 3)
			continue;

		if (line_mjr == buf->stx_dev_major && line_mnr == buf->stx_dev_minor)
			break;
	}

	SAFE_FCLOSE(file);

	if (buf->stx_mnt_id == mnt_id)
		tst_res(TPASS,
			"statx.stx_mnt_id equals to mount_id(%"PRIu64") in /proc/self/mountinfo",
			mnt_id);
	else
		tst_res(TFAIL,
			"statx.stx_mnt_id(%"PRIu64") is different from mount_id(%"PRIu64") in /proc/self/mountinfo",
			(uint64_t)buf->stx_mnt_id, mnt_id);

	pid = getpid();
	snprintf(line, PATH_MAX, "/proc/%d/fdinfo/%d", pid, file_fd);
	TST_ASSERT_FILE_INT(line, "mnt_id:", buf->stx_mnt_id);
}
#endif

static void test_normal_file(void)
{
	struct statx buff;

	TEST(statx(AT_FDCWD, TESTFILE, 0, 0, &buff));
	if (TST_RET == 0)
		tst_res(TPASS,
			"statx(AT_FDCWD, %s, 0, 0, &buff)", TESTFILE);
	else
		tst_brk(TFAIL | TTERRNO,
			"statx(AT_FDCWD, %s, 0, 0, &buff)", TESTFILE);

	if (geteuid() == buff.stx_uid)
		tst_res(TPASS, "stx_uid(%u) is correct", buff.stx_uid);
	else
		tst_res(TFAIL, "stx_uid(%u) is different from euid(%u)",
			buff.stx_uid, geteuid());

	if (getegid() == buff.stx_gid)
		tst_res(TPASS, "stx_gid(%u) is correct", buff.stx_gid);
	else
		tst_res(TFAIL, "stx_gid(%u) is different from egid(%u)",
			buff.stx_gid, getegid());

	if (buff.stx_size == SIZE)
		tst_res(TPASS,
			"stx_size(%"PRIu64") is correct", (uint64_t)buff.stx_size);
	else
		tst_res(TFAIL,
			"stx_size(%"PRIu64") is different from expected(%u)",
			(uint64_t)buff.stx_size, SIZE);

	if ((buff.stx_mode & ~(S_IFMT)) == MODE)
		tst_res(TPASS, "stx_mode(%u) is correct", buff.stx_mode);
	else
		tst_res(TFAIL, "stx_mode(%u) is different from expected(%u)",
			buff.stx_mode, MODE);

	if (buff.stx_blocks <= buff.stx_blksize/512 * 2)
		tst_res(TPASS, "stx_blocks(%"PRIu64") is valid",
			(uint64_t)buff.stx_blocks);
	else
		tst_res(TFAIL, "stx_blocks(%"PRIu64") is invalid",
			(uint64_t)buff.stx_blocks);

	if (buff.stx_nlink == 1)
		tst_res(TPASS, "stx_nlink(1) is correct");
	else
		tst_res(TFAIL, "stx_nlink(%u) is different from expected(1)",
			buff.stx_nlink);

#ifdef HAVE_STRUCT_STATX_STX_MNT_ID
	test_mnt_id(&buff);
#else
	tst_res(TCONF, "stx_mnt_id is not defined in struct statx");
#endif
}

static void test_device_file(void)
{
	struct statx buff;

	TEST(statx(AT_FDCWD, DEVICEFILE, 0, 0, &buff));
	if (TST_RET == 0)
		tst_res(TPASS,
			"statx(AT_FDCWD, %s, 0, 0, &buff)", DEVICEFILE);
	else
		tst_brk(TFAIL | TTERRNO,
			"statx(AT_FDCWD, %s, 0, 0, &buff)", DEVICEFILE);

	if (buff.stx_rdev_major == MAJOR)
		tst_res(TPASS, "stx_rdev_major(%u) is correct",
			buff.stx_rdev_major);
	else
		tst_res(TFAIL,
			"stx_rdev_major(%u) is different from expected(%u)",
			buff.stx_rdev_major, MAJOR);

	if (buff.stx_rdev_minor == MINOR)
		tst_res(TPASS, "stx_rdev_minor(%u) is correct",
			buff.stx_rdev_minor);
	else
		tst_res(TFAIL,
			"stx_rdev_minor(%u) is different from expected(%u)",
			buff.stx_rdev_minor, MINOR);
}


static struct tcase {
	void (*tfunc)(void);
} tcases[] = {
	{&test_normal_file},
	{&test_device_file}
};

static void run(unsigned int i)
{
	tcases[i].tfunc();
}

static void setup(void)
{
	char data_buff[SIZE];

	umask(0);

	memset(data_buff, '@', sizeof(data_buff));

	file_fd =  SAFE_OPEN(TESTFILE, O_RDWR|O_CREAT, MODE);
	SAFE_WRITE(1, file_fd, data_buff, sizeof(data_buff));

	SAFE_MKNOD(DEVICEFILE, S_IFBLK | 0777, makedev(MAJOR, MINOR));
}

static void cleanup(void)
{
	if (file_fd > -1)
		SAFE_CLOSE(file_fd);
}

static struct tst_test test = {
	.test = run,
	.tcnt = ARRAY_SIZE(tcases),
	.setup = setup,
	.cleanup = cleanup,
	.min_kver = "4.11",
	.needs_devfs = 1,
	.mntpoint = MNTPOINT,
	.needs_root = 1,
};