1 /*
2 * Copyright (c) 2014 Fujitsu Ltd.
3 * Author: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19 /*
20 * Test Description:
21 * Verify that,
22 * 1. link() fails with -1 return value and sets errno to EPERM
23 * if oldpath is a directory.
24 * 2. link() fails with -1 return value and sets errno to EXDEV
25 * if oldpath and newpath are not on the same mounted file system( Linux
26 * permits a file system to be mounted at multiple points, but link()
27 * does not work across different mount points, even if the same
28 * file system is mounted on both. ).
29 * 3. link() fails with -1 return value and sets errno to EROFS
30 * if the file is on a read-only file system.
31 * 4. link() fails with -1 return value and sets errno to ELOOP
32 * if too many symbolic links were encountered in resolving path.
33 */
34 #include <errno.h>
35 #include "tst_test.h"
36
37 #define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
38 S_IXGRP|S_IROTH|S_IXOTH)
39 #define MNT_POINT "mntpoint"
40 #define TEST_FILE "testfile"
41 #define TEST_FILE1 "testfile1"
42 #define TEST_FILE2 "mntpoint/file"
43 #define TEST_FILE3 "mntpoint/testfile4"
44
45 static char test_file4[PATH_MAX] = ".";
46 static void setup(void);
47
48 static struct tcase {
49 char *oldpath;
50 char *newpath;
51 int exp_errno;
52 } tcases[] = {
53 {TEST_FILE1, TEST_FILE, EPERM},
54 {TEST_FILE2, TEST_FILE, EXDEV},
55 {TEST_FILE2, TEST_FILE3, EROFS},
56 {test_file4, TEST_FILE, ELOOP},
57 };
58
link_verify(unsigned int i)59 static void link_verify(unsigned int i)
60 {
61 struct tcase *tc = &tcases[i];
62
63 TEST(link(tc->oldpath, tc->newpath));
64
65 if (TST_RET != -1) {
66 tst_res(TFAIL, "link() succeeded unexpectedly (%li)",
67 TST_RET);
68 return;
69 }
70
71 if (TST_ERR == tc->exp_errno) {
72 tst_res(TPASS | TTERRNO, "link() failed as expected");
73 return;
74 }
75
76 tst_res(TFAIL | TTERRNO,
77 "link() failed unexpectedly; expected: %d - %s",
78 tc->exp_errno, tst_strerrno(tc->exp_errno));
79 }
80
setup(void)81 static void setup(void)
82 {
83 int i;
84
85 SAFE_MKDIR(TEST_FILE1, DIR_MODE);
86
87 SAFE_MKDIR("test_eloop", DIR_MODE);
88 SAFE_SYMLINK("../test_eloop", "test_eloop/test_eloop");
89 for (i = 0; i < 43; i++)
90 strcat(test_file4, "/test_eloop");
91 }
92
93 static struct tst_test test = {
94 .setup = setup,
95 .test = link_verify,
96 .tcnt = ARRAY_SIZE(tcases),
97 .needs_root = 1,
98 .needs_rofs = 1,
99 .mntpoint = MNT_POINT,
100 };
101