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 <chrubis@suse.cz>
5 * Author: Nirmala Devi Dhanasekar <nirmala.devi@wipro.com>
6 *
7 * Check for basic errors returned by umount(2) system call.
8 *
9 * Verify that umount(2) returns -1 and sets errno to
10 * 1) EBUSY if it cannot be umounted, because dir is still busy.
11 * 2) EFAULT if specialfile or device file points to invalid address space.
12 * 3) ENOENT if pathname was empty or has a nonexistent component.
13 * 4) EINVAL if specialfile or device is invalid or not a mount point.
14 * 5) ENAMETOOLONG if pathname was longer than MAXPATHLEN.
15 */
16
17 #include <errno.h>
18 #include <string.h>
19 #include <sys/mount.h>
20 #include "tst_test.h"
21
22 #define MNTPOINT "mntpoint"
23
24 static char long_path[PATH_MAX + 2];
25 static int mount_flag;
26 static int fd;
27
28 static struct tcase {
29 const char *err_desc;
30 const char *mntpoint;
31 int exp_errno;
32 } tcases[] = {
33 {"Already mounted/busy", MNTPOINT, EBUSY},
34 {"Invalid address", NULL, EFAULT},
35 {"Directory not found", "nonexistent", ENOENT},
36 {"Invalid device", "./", EINVAL},
37 {"Pathname too long", long_path, ENAMETOOLONG}
38 };
39
verify_umount(unsigned int n)40 static void verify_umount(unsigned int n)
41 {
42 struct tcase *tc = &tcases[n];
43
44 TEST(umount(tc->mntpoint));
45
46 if (TST_RET != -1) {
47 tst_res(TFAIL, "umount() succeeds unexpectedly");
48 return;
49 }
50
51 if (tc->exp_errno != TST_ERR) {
52 tst_res(TFAIL | TTERRNO, "umount() should fail with %s",
53 tst_strerrno(tc->exp_errno));
54 return;
55 }
56
57 tst_res(TPASS | TTERRNO, "umount() fails as expected: %s",
58 tc->err_desc);
59 }
60
setup(void)61 static void setup(void)
62 {
63 memset(long_path, 'a', PATH_MAX + 1);
64
65 SAFE_MKDIR(MNTPOINT, 0775);
66 SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, NULL);
67 mount_flag = 1;
68
69 fd = SAFE_CREAT(MNTPOINT "/file", 0777);
70 }
71
cleanup(void)72 static void cleanup(void)
73 {
74 if (fd > 0)
75 SAFE_CLOSE(fd);
76
77 if (mount_flag)
78 tst_umount(MNTPOINT);
79 }
80
81 static struct tst_test test = {
82 .tcnt = ARRAY_SIZE(tcases),
83 .needs_root = 1,
84 .format_device = 1,
85 .setup = setup,
86 .cleanup = cleanup,
87 .test = verify_umount,
88 };
89