1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved.
4 * Copyright (c) 2014 Cyril Hrubis <[email protected]>
5 * Copyright (c) Linux Test Project, 2002-2023
6 * Author: Nirmala Devi Dhanasekar <[email protected]>
7 */
8
9 /*\
10 * [Description]
11 *
12 * Check for basic errors returned by umount(2) system call.
13 *
14 * Verify that umount(2) returns -1 and sets errno to
15 *
16 * 1. EBUSY if it cannot be umounted, because dir is still busy.
17 * 2. EFAULT if specialfile or device file points to invalid address space.
18 * 3. ENOENT if pathname was empty or has a nonexistent component.
19 * 4. EINVAL if specialfile or device is invalid or not a mount point.
20 * 5. ENAMETOOLONG if pathname was longer than MAXPATHLEN.
21 */
22
23 #include <sys/mount.h>
24 #include "tst_test.h"
25
26 #define MNTPOINT "mntpoint"
27
28 static char long_path[PATH_MAX + 2];
29 static int mount_flag;
30 static int fd;
31
32 static struct tcase {
33 const char *err_desc;
34 const char *mntpoint;
35 int exp_errno;
36 } tcases[] = {
37 {"Already mounted/busy", MNTPOINT, EBUSY},
38 {"Invalid address", NULL, EFAULT},
39 {"Directory not found", "nonexistent", ENOENT},
40 {"Invalid device", "./", EINVAL},
41 {"Pathname too long", long_path, ENAMETOOLONG}
42 };
43
verify_umount(unsigned int n)44 static void verify_umount(unsigned int n)
45 {
46 struct tcase *tc = &tcases[n];
47
48 TST_EXP_FAIL(umount(tc->mntpoint), tc->exp_errno);
49 }
50
setup(void)51 static void setup(void)
52 {
53 memset(long_path, 'a', PATH_MAX + 1);
54
55 SAFE_MKDIR(MNTPOINT, 0775);
56 SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, NULL);
57 mount_flag = 1;
58
59 fd = SAFE_CREAT(MNTPOINT "/file", 0777);
60 }
61
cleanup(void)62 static void cleanup(void)
63 {
64 if (fd > 0)
65 SAFE_CLOSE(fd);
66
67 if (mount_flag)
68 tst_umount(MNTPOINT);
69 }
70
71 static struct tst_test test = {
72 .tcnt = ARRAY_SIZE(tcases),
73 .needs_root = 1,
74 .format_device = 1,
75 .setup = setup,
76 .cleanup = cleanup,
77 .test = verify_umount,
78 };
79