1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2014 Fujitsu Ltd.
4 * Author: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
5 */
6 /*
7 * Test Description:
8 * Verify that,
9 * 1. link() fails with -1 return value and sets errno to EPERM
10 * if oldpath is a directory.
11 * 2. link() fails with -1 return value and sets errno to EXDEV
12 * if oldpath and newpath are not on the same mounted file system( Linux
13 * permits a file system to be mounted at multiple points, but link()
14 * does not work across different mount points, even if the same
15 * file system is mounted on both. ).
16 * 3. link() fails with -1 return value and sets errno to EROFS
17 * if the file is on a read-only file system.
18 * 4. link() fails with -1 return value and sets errno to ELOOP
19 * if too many symbolic links were encountered in resolving path.
20 */
21 #include <errno.h>
22 #include "tst_test.h"
23
24 #define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
25 S_IXGRP|S_IROTH|S_IXOTH)
26 #define MNT_POINT "mntpoint"
27 #define TEST_FILE "testfile"
28 #define TEST_FILE1 "testfile1"
29 #define TEST_FILE2 "mntpoint/file"
30 #define TEST_FILE3 "mntpoint/testfile4"
31
32 static char test_file4[PATH_MAX] = ".";
33 static void setup(void);
34
35 static struct tcase {
36 char *oldpath;
37 char *newpath;
38 int exp_errno;
39 } tcases[] = {
40 {TEST_FILE1, TEST_FILE, EPERM},
41 {TEST_FILE2, TEST_FILE, EXDEV},
42 {TEST_FILE2, TEST_FILE3, EROFS},
43 {test_file4, TEST_FILE, ELOOP},
44 };
45
link_verify(unsigned int i)46 static void link_verify(unsigned int i)
47 {
48 struct tcase *tc = &tcases[i];
49
50 TEST(link(tc->oldpath, tc->newpath));
51
52 if (TST_RET != -1) {
53 tst_res(TFAIL, "link() succeeded unexpectedly (%li)",
54 TST_RET);
55 return;
56 }
57
58 if (TST_ERR == tc->exp_errno) {
59 tst_res(TPASS | TTERRNO, "link() failed as expected");
60 return;
61 }
62
63 tst_res(TFAIL | TTERRNO,
64 "link() failed unexpectedly; expected: %d - %s",
65 tc->exp_errno, tst_strerrno(tc->exp_errno));
66 }
67
setup(void)68 static void setup(void)
69 {
70 int i;
71
72 SAFE_MKDIR(TEST_FILE1, DIR_MODE);
73
74 SAFE_MKDIR("test_eloop", DIR_MODE);
75 SAFE_SYMLINK("../test_eloop", "test_eloop/test_eloop");
76 for (i = 0; i < 43; i++)
77 strcat(test_file4, "/test_eloop");
78 }
79
80 static struct tst_test test = {
81 .setup = setup,
82 .test = link_verify,
83 .tcnt = ARRAY_SIZE(tcases),
84 .needs_root = 1,
85 .needs_rofs = 1,
86 .mntpoint = MNT_POINT,
87 };
88