1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
4 * Author: Yang Xu <xuyang2018.jy@cn.jujitsu.com>
5 *
6 * This is a basic ioctl test about loopdevice.
7 *
8 * It is designed to test LOOP_CHANGE_FD can not succeed (get EINVAL error)
9 * when loop_dev is not read only.
10 */
11
12 #include <stdio.h>
13 #include <unistd.h>
14 #include <string.h>
15 #include "lapi/loop.h"
16 #include "tst_test.h"
17
18 static char dev_path[1024];
19 static int dev_num, dev_fd, file_fd, attach_flag;
20
verify_ioctl_loop(void)21 static void verify_ioctl_loop(void)
22 {
23 TEST(ioctl(dev_fd, LOOP_CHANGE_FD, file_fd));
24 if (TST_RET == 0) {
25 tst_res(TFAIL, "LOOP_CHANGE_FD succeeded unexpectedly");
26 return;
27 }
28 if (TST_ERR == EINVAL)
29 tst_res(TPASS | TTERRNO, "LOOP_CHANGE_FD failed as expected");
30 else
31 tst_res(TFAIL | TTERRNO, "LOOP_CHANGE_FD failed expected EINVAL got");
32 }
33
setup(void)34 static void setup(void)
35 {
36 struct loop_info loopinfoget;
37
38 memset(&loopinfoget, 0, sizeof(loopinfoget));
39 dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
40 if (dev_num < 0)
41 tst_brk(TBROK, "Failed to find free loop device");
42
43 tst_fill_file("test.img", 0, 1024, 10);
44 tst_attach_device(dev_path, "test.img");
45 attach_flag = 1;
46
47 dev_fd = SAFE_OPEN(dev_path, O_RDWR);
48 file_fd = SAFE_OPEN("test.img", O_RDWR);
49 SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget);
50
51 if (loopinfoget.lo_flags & LO_FLAGS_READ_ONLY)
52 tst_brk(TCONF, "Current environment has unexpected LO_FLAGS_READ_ONLY flag");
53 }
54
cleanup(void)55 static void cleanup(void)
56 {
57 if (dev_fd > 0)
58 SAFE_CLOSE(dev_fd);
59 if (file_fd > 0)
60 SAFE_CLOSE(file_fd);
61 if (attach_flag)
62 tst_detach_device(dev_path);
63 }
64
65 static struct tst_test test = {
66 .setup = setup,
67 .cleanup = cleanup,
68 .test_all = verify_ioctl_loop,
69 .needs_root = 1,
70 .needs_tmpdir = 1,
71 .needs_drivers = (const char *const []) {
72 "loop",
73 NULL
74 }
75 };
76