// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
 * Author: David Fenner, Jon Hendrickson
 * Copyright (C) 2024 Andrea Cervesato <andrea.cervesato@suse.com>
 */

/*\
 * This test verifies that lstat() provides correct information according
 * with device, access time, block size, ownership, etc.
 * The implementation provides a set of tests which are specific for each one
 * of the `struct stat` used to read file and symlink information.
 */

#include "tst_test.h"

#define FILENAME "file.txt"
#define MNTPOINT "mntpoint"
#define SYMBNAME MNTPOINT"/file_symlink"

static struct stat *file_stat;
static struct stat *symb_stat;

static void run(void)
{
	SAFE_LSTAT(FILENAME, file_stat);
	SAFE_LSTAT(SYMBNAME, symb_stat);

	TST_EXP_EXPR(file_stat->st_dev != symb_stat->st_dev);
	TST_EXP_EXPR(file_stat->st_mode != symb_stat->st_mode);
	TST_EXP_EXPR(file_stat->st_nlink != symb_stat->st_nlink);
	TST_EXP_EXPR(file_stat->st_ino != symb_stat->st_ino);
	TST_EXP_EXPR(file_stat->st_uid != symb_stat->st_uid);
	TST_EXP_EXPR(file_stat->st_gid != symb_stat->st_gid);
	TST_EXP_EXPR(file_stat->st_size != symb_stat->st_size);
	TST_EXP_EXPR(file_stat->st_blocks != symb_stat->st_blocks);
	TST_EXP_EXPR(file_stat->st_blksize != symb_stat->st_blksize);
	TST_EXP_EXPR(file_stat->st_atime != symb_stat->st_atime);
	TST_EXP_EXPR(file_stat->st_mtime != symb_stat->st_mtime);
	TST_EXP_EXPR(file_stat->st_ctime != symb_stat->st_ctime);
}

static void setup(void)
{
	char opt_bsize[32];
	const char *const fs_opts[] = {opt_bsize, NULL};
	struct stat sb;
	int pagesize;
	int fd;

	/* change st_blksize / st_dev */
	SAFE_STAT(".", &sb);
	pagesize = sb.st_blksize == 4096 ? 1024 : 4096;

	snprintf(opt_bsize, sizeof(opt_bsize), "-b %i", pagesize);
	SAFE_MKFS(tst_device->dev, tst_device->fs_type, fs_opts, NULL);
	SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, 0);

	SAFE_TOUCH(FILENAME, 0777, NULL);

	/* change st_nlink */
	SAFE_LINK(FILENAME, "linked_file");

	/* change st_uid and st_gid */
	SAFE_CHOWN(FILENAME, 1000, 1000);

	/* change st_size */
	fd = SAFE_OPEN(FILENAME, O_WRONLY, 0777);
	tst_fill_fd(fd, 'a', TST_KB, 500);
	SAFE_CLOSE(fd);

	/* change st_atime / st_mtime / st_ctime */
	usleep(1001000);

	SAFE_SYMLINK(FILENAME, SYMBNAME);
}

static void cleanup(void)
{
	if (tst_is_mounted(MNTPOINT))
		SAFE_UMOUNT(MNTPOINT);
}

static struct tst_test test = {
	.setup = setup,
	.cleanup = cleanup,
	.test_all = run,
	.needs_root = 1,
	.needs_device = 1,
	.mntpoint = MNTPOINT,
	.bufs = (struct tst_buffers []) {
		{&file_stat, .size = sizeof(struct stat)},
		{&symb_stat, .size = sizeof(struct stat)},
		{}
	}
};