1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Ported to LTP: Wayne Boyer
5 * Copyright (c) 2017 Fujitsu Ltd.
6 *	04/2017 Modified by Jinhui Huang
7 */
8/*
9 * DESCRIPTION
10 *	test 1:
11 *	Read with an invalid file descriptor, and expect an EBADF.
12 *
13 *	test 2:
14 *	The parameter passed to read is a directory, check if the errno is
15 *	set to EISDIR.
16 *
17 *	test 3:
18 *	Buf is outside the accessible address space, expect an EFAULT.
19 *
20 *	test 4:
21 *	The file was opened with the O_DIRECT flag, and transfer sizes was not
22 *	multiples of the logical block size of the file system, expect an
23 *	EINVAL.
24 *
25 *	test 5:
26 *	The file was opened with the O_DIRECT flag, and the alignment of the
27 *	user buffer was not multiples of the logical block size of the file
28 *	system, expect an EINVAL.
29 */
30
31#define _GNU_SOURCE
32
33#include <stdio.h>
34#include <stdlib.h>
35#include <errno.h>
36#include "tst_test.h"
37
38static int badfd = -1;
39static int fd2, fd3, fd4 = -1;
40static char buf[BUFSIZ];
41static void *bufaddr = buf;
42static void *outside_buf = (void *)-1;
43static void *addr4;
44static void *addr5;
45static long fs_type;
46
47static struct tcase {
48	int *fd;
49	void **buf;
50	size_t count;
51	int exp_error;
52} tcases[] = {
53	{&badfd, &bufaddr, 1, EBADF},
54	{&fd2, &bufaddr, 1, EISDIR},
55#ifndef UCLINUX
56	{&fd3, &outside_buf, 1, EFAULT},
57#endif
58	{&fd4, &addr4, 1, EINVAL},
59	{&fd4, &addr5, 4096, EINVAL},
60};
61
62static void verify_read(unsigned int n)
63{
64	struct tcase *tc = &tcases[n];
65
66	if (tc->fd == &fd4 && *tc->fd == -1) {
67		tst_res(TCONF, "O_DIRECT not supported on %s filesystem",
68			tst_fs_type_name(fs_type));
69		return;
70	}
71
72	TEST(read(*tc->fd, *tc->buf, tc->count));
73
74	if (*tc->fd == fd4 && TST_RET >= 0) {
75		tst_res(TPASS,
76			"O_DIRECT unaligned reads fallbacks to buffered I/O");
77		return;
78	}
79
80	if (TST_RET != -1) {
81		tst_res(TFAIL, "read() succeeded unexpectedly");
82		return;
83	}
84
85	if (TST_ERR == tc->exp_error) {
86		tst_res(TPASS | TTERRNO, "read() failed as expected");
87	} else {
88		tst_res(TFAIL | TTERRNO, "read() failed unexpectedly, "
89			"expected %s", tst_strerrno(tc->exp_error));
90	}
91}
92
93static void setup(void)
94{
95	fd2 = SAFE_OPEN(".", O_DIRECTORY);
96
97	SAFE_FILE_PRINTF("test_file", "A");
98
99	fd3 = SAFE_OPEN("test_file", O_RDWR);
100
101#if !defined(UCLINUX)
102	outside_buf = SAFE_MMAP(0, 1, PROT_NONE,
103				MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
104#endif
105
106	addr4 = SAFE_MEMALIGN(getpagesize(), (4096 * 10));
107	addr5 = addr4 + 1;
108
109	fs_type = tst_fs_type(".");
110	if (fs_type != TST_TMPFS_MAGIC)
111		fd4 = SAFE_OPEN("test_file", O_RDWR | O_DIRECT);
112}
113
114static void cleanup(void)
115{
116	free(addr4);
117
118	if (fd4 > 0)
119		SAFE_CLOSE(fd4);
120
121	if (fd3 > 0)
122		SAFE_CLOSE(fd3);
123
124	if (fd2 > 0)
125		SAFE_CLOSE(fd2);
126}
127
128static struct tst_test test = {
129	.tcnt = ARRAY_SIZE(tcases),
130	.test = verify_read,
131	.setup = setup,
132	.cleanup = cleanup,
133	.needs_tmpdir = 1,
134};
135