1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
4 * Copyright (c) Linux Test Project, 2022
5 * Author: Yang Xu <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Tests ioctl() on loopdevice with LOOP_CHANGE_FD flag.
12 *
13 * Tests whether LOOP_CHANGE_FD can not succeed (get EINVAL error)
14 * when loop_dev is not read only.
15 */
16
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <string.h>
20 #include "lapi/loop.h"
21 #include "tst_test.h"
22
23 static char dev_path[1024];
24 static int dev_num, dev_fd, file_fd, attach_flag;
25
verify_ioctl_loop(void)26 static void verify_ioctl_loop(void)
27 {
28 TEST(ioctl(dev_fd, LOOP_CHANGE_FD, file_fd));
29 if (TST_RET == 0) {
30 tst_res(TFAIL, "LOOP_CHANGE_FD succeeded unexpectedly");
31 return;
32 }
33 if (TST_ERR == EINVAL)
34 tst_res(TPASS | TTERRNO, "LOOP_CHANGE_FD failed as expected");
35 else
36 tst_res(TFAIL | TTERRNO, "LOOP_CHANGE_FD failed expected EINVAL got");
37 }
38
setup(void)39 static void setup(void)
40 {
41 struct loop_info loopinfoget;
42
43 memset(&loopinfoget, 0, sizeof(loopinfoget));
44 dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
45 if (dev_num < 0)
46 tst_brk(TBROK, "Failed to find free loop device");
47
48 tst_fill_file("test.img", 0, 1024, 10);
49 tst_attach_device(dev_path, "test.img");
50 attach_flag = 1;
51
52 dev_fd = SAFE_OPEN(dev_path, O_RDWR);
53 file_fd = SAFE_OPEN("test.img", O_RDWR);
54 SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget);
55
56 if (loopinfoget.lo_flags & LO_FLAGS_READ_ONLY)
57 tst_brk(TCONF, "Current environment has unexpected LO_FLAGS_READ_ONLY flag");
58 }
59
cleanup(void)60 static void cleanup(void)
61 {
62 if (dev_fd > 0)
63 SAFE_CLOSE(dev_fd);
64 if (file_fd > 0)
65 SAFE_CLOSE(file_fd);
66 if (attach_flag)
67 tst_detach_device(dev_path);
68 }
69
70 static struct tst_test test = {
71 .setup = setup,
72 .cleanup = cleanup,
73 .test_all = verify_ioctl_loop,
74 .needs_root = 1,
75 .needs_tmpdir = 1,
76 .needs_drivers = (const char *const []) {
77 "loop",
78 NULL
79 }
80 };
81