1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2014
4 */
5
6/*\
7 * [Description]
8 *
9 * Testcase copied from sendfile02.c to test the basic functionality of
10 * the sendfile() system call on large file. There is a kernel bug which
11 * introduced by commit 8f9c0119d7ba9 and fixed by commit 5d73320a96fcc.
12 *
13 * Only supports 64bit systems.
14 *
15 * [Algorithm]
16 *
17 * 1. Call sendfile() with offset at 0.
18 * 2. Call sendfile() with offset at 3GB.
19 */
20
21#include <inttypes.h>
22#include <sys/sendfile.h>
23
24#include "tst_test.h"
25#include "lapi/abisize.h"
26
27#ifndef TST_ABI32
28
29#define ONE_GB		(INT64_C(1) << 30)
30#define IN_FILE		"in_file"
31#define OUT_FILE	"out_file"
32
33static struct test_case_t {
34	char *desc;
35	off_t offset;
36	int64_t count;
37	int64_t exp_retval;
38	int64_t exp_updated_offset;
39} tc[] = {
40	{ "offset at 0", 0, ONE_GB, ONE_GB, ONE_GB },
41	{ "offset at 3GB", 3 * ONE_GB, ONE_GB, ONE_GB, 4 * ONE_GB }
42};
43
44static void setup(void)
45{
46	int i, fd;
47
48	if (!tst_fs_has_free(".", 5, TST_GB))
49		tst_brk(TCONF, "Test on large file needs 5G free space");
50
51	fd = SAFE_CREAT(IN_FILE, 00700);
52	for (i = 1; i <= (4 * 1024); ++i) {
53		SAFE_LSEEK(fd, 1024 * 1024 - 1, SEEK_CUR);
54		SAFE_WRITE(SAFE_WRITE_ALL, fd, "C", 1);
55	}
56	SAFE_CLOSE(fd);
57
58	fd = SAFE_CREAT(OUT_FILE, 00700);
59	SAFE_CLOSE(fd);
60}
61
62static void run(unsigned int i)
63{
64	int in_fd = SAFE_OPEN(IN_FILE, O_RDONLY);
65	int out_fd = SAFE_OPEN(OUT_FILE, O_WRONLY);
66	off_t offset = tc[i].offset;
67
68	off_t before_pos, after_pos;
69	before_pos = SAFE_LSEEK(in_fd, 0, SEEK_CUR);
70
71	TEST(sendfile(out_fd, in_fd, &offset, tc[i].count));
72	after_pos = SAFE_LSEEK(in_fd, 0, SEEK_CUR);
73
74	if (TST_RET != tc[i].exp_retval)
75		tst_res(TFAIL, "sendfile() failed to return expected value, "
76			       "expected: %" PRId64 ", got: %ld",
77			tc[i].exp_retval, TST_RET);
78	else if (offset != tc[i].exp_updated_offset)
79		tst_res(TFAIL, "sendfile() failed to update OFFSET parameter to "
80			       "expected value, expected: %" PRId64 ", got: %" PRId64,
81			tc[i].exp_updated_offset, (int64_t)(offset));
82	else if (before_pos != after_pos)
83		tst_res(TFAIL, "sendfile() updated the file position of in_fd "
84			       "unexpectedly, expected file position: %" PRId64
85			       ", actual file position %" PRId64,
86			(int64_t)(before_pos), (int64_t)(after_pos));
87	else
88		tst_res(TPASS, "sendfile() with %s", tc[i].desc);
89
90	SAFE_CLOSE(in_fd);
91	SAFE_CLOSE(out_fd);
92}
93
94static struct tst_test test = {
95	.needs_tmpdir = 1,
96	.setup = setup,
97	.test = run,
98	.tcnt = ARRAY_SIZE(tc),
99	.max_runtime = 120,
100	.tags = (const struct tst_tag[]) {
101		{"linux-git", "5d73320a96fcc"},
102		{}
103	}
104};
105
106#else
107TST_TEST_TCONF("This test is only for 64bit");
108#endif
109