1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2001, International Business Machines  Corp.
4 * Copyright (c) 2020, Joerg Vehlow <joerg.vehlow@aox-tech.de>
5 *
6 * The purpose of this test is to verify the file size limitations
7 * of a filesystem. It writes one buffer at a time and lseeks from
8 * the beginning of the file to the end of the last write position.
9 * The intent is to test lseek64.
10 */
11
12#include <stdio.h>
13#include <stdlib.h>
14#include <sys/types.h>
15#include <sys/stat.h>
16#include <unistd.h>
17#include <fcntl.h>
18#include <time.h>
19
20#include "tst_test.h"
21
22static char *str_bufnum;
23static int bufnum = 100;
24static char buf[TST_MB];
25
26static void setup(void)
27{
28	unsigned int i;
29
30	if (str_bufnum) {
31		if (tst_parse_int(str_bufnum, &bufnum, 0, INT_MAX)) {
32			tst_brk(TBROK, "Invalid buffer count '%s'", str_bufnum);
33		}
34	}
35
36	buf[0] = 'A';
37	for (i = 1; i < ARRAY_SIZE(buf) - 1; i++)
38		buf[i] = '0';
39	buf[ARRAY_SIZE(buf) - 1] = 'Z';
40}
41
42static void run(void)
43{
44	time_t time1, time2;
45	int i, fd, diff;
46
47	time1 = time(NULL);
48	tst_res(TINFO, "started building a %d megabyte file", bufnum);
49
50	if ((fd = creat("large_file", 0755)) == -1)
51		tst_brk(TBROK | TERRNO, "creat() failed");
52
53	for (i = 0; i < bufnum; i++) {
54		if (write(fd, buf, sizeof(buf)) == -1) {
55			tst_brk(TFAIL | TERRNO, "write() failed");
56		}
57		fsync(fd);
58		if (lseek(fd, (i + 1) * sizeof(buf), 0) == -1)
59			tst_brk(TFAIL | TERRNO, "lseek failed");
60	}
61	close(fd);
62	time2 = time(NULL);
63	tst_res(TINFO, "finished building a %d megabyte file", bufnum);
64	diff = time2 - time1;
65	tst_res(TINFO, "total time for test to run: %d minute(s) and %d seconds",
66	        diff / 60, diff % 60);
67
68	tst_res(TPASS, "test successful");
69}
70
71static struct tst_test test = {
72	.options = (struct tst_option[]) {
73		{"n:", &str_bufnum, "COUNT Number of megabytes to write (default 100)"},
74		{}
75	},
76	.needs_tmpdir = 1,
77	.setup = setup,
78	.test_all = run
79};
80