1 /*
2  * Image locking tests
3  *
4  * Copyright (c) 2018 Red Hat Inc.
5  *
6  * Author: Fam Zheng <famz@redhat.com>
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining a copy
9  * of this software and associated documentation files (the "Software"), to deal
10  * in the Software without restriction, including without limitation the rights
11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12  * copies of the Software, and to permit persons to whom the Software is
13  * furnished to do so, subject to the following conditions:
14  *
15  * The above copyright notice and this permission notice shall be included in
16  * all copies or substantial portions of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24  * THE SOFTWARE.
25  */
26 
27 #include "qemu/osdep.h"
28 #include "block/block.h"
29 #include "sysemu/block-backend.h"
30 #include "qapi/error.h"
31 #include "qapi/qmp/qdict.h"
32 #include "qemu/main-loop.h"
33 
34 static BlockBackend *open_image(const char *path,
35                                 uint64_t perm, uint64_t shared_perm,
36                                 Error **errp)
37 {
38     Error *local_err = NULL;
39     BlockBackend *blk;
40     QDict *options = qdict_new();
41 
42     qdict_put_str(options, "driver", "raw");
43     blk = blk_new_open(path, NULL, options, BDRV_O_RDWR, &local_err);
44     if (blk) {
45         g_assert_null(local_err);
46         if (blk_set_perm(blk, perm, shared_perm, errp)) {
47             blk_unref(blk);
48             blk = NULL;
49         }
50     } else {
51         error_propagate(errp, local_err);
52     }
53     return blk;
54 }
55 
56 static void check_locked_bytes(int fd, uint64_t perm_locks,
57                                uint64_t shared_perm_locks)
58 {
59     int i;
60 
61     if (!perm_locks && !shared_perm_locks) {
62         g_assert(!qemu_lock_fd_test(fd, 0, 0, true));
63         return;
64     }
65     for (i = 0; (1ULL << i) <= BLK_PERM_ALL; i++) {
66         uint64_t bit = (1ULL << i);
67         bool perm_expected = !!(bit & perm_locks);
68         bool shared_perm_expected = !!(bit & shared_perm_locks);
69         g_assert_cmpint(perm_expected, ==,
70                         !!qemu_lock_fd_test(fd, 100 + i, 1, true));
71         g_assert_cmpint(shared_perm_expected, ==,
72                         !!qemu_lock_fd_test(fd, 200 + i, 1, true));
73     }
74 }
75 
76 static void test_image_locking_basic(void)
77 {
78     BlockBackend *blk1, *blk2, *blk3;
79     char img_path[] = "/tmp/qtest.XXXXXX";
80     uint64_t perm, shared_perm;
81 
82     int fd = mkstemp(img_path);
83     assert(fd >= 0);
84 
85     perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
86     shared_perm = BLK_PERM_ALL;
87     blk1 = open_image(img_path, perm, shared_perm, &error_abort);
88     g_assert(blk1);
89 
90     check_locked_bytes(fd, perm, ~shared_perm);
91 
92     /* compatible perm between blk1 and blk2 */
93     blk2 = open_image(img_path, perm | BLK_PERM_RESIZE, shared_perm, NULL);
94     g_assert(blk2);
95     check_locked_bytes(fd, perm | BLK_PERM_RESIZE, ~shared_perm);
96 
97     /* incompatible perm with already open blk1 and blk2 */
98     blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, NULL);
99     g_assert_null(blk3);
100 
101     blk_unref(blk2);
102 
103     /* Check that extra bytes in blk2 are correctly unlocked */
104     check_locked_bytes(fd, perm, ~shared_perm);
105 
106     blk_unref(blk1);
107 
108     /* Image is unused, no lock there */
109     check_locked_bytes(fd, 0, 0);
110     blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, &error_abort);
111     g_assert(blk3);
112     blk_unref(blk3);
113     close(fd);
114     unlink(img_path);
115 }
116 
117 static void test_set_perm_abort(void)
118 {
119     BlockBackend *blk1, *blk2;
120     char img_path[] = "/tmp/qtest.XXXXXX";
121     uint64_t perm, shared_perm;
122     int r;
123     int fd = mkstemp(img_path);
124     assert(fd >= 0);
125 
126     perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
127     shared_perm = BLK_PERM_ALL;
128     blk1 = open_image(img_path, perm, shared_perm, &error_abort);
129     g_assert(blk1);
130 
131     blk2 = open_image(img_path, perm, shared_perm, &error_abort);
132     g_assert(blk2);
133 
134     check_locked_bytes(fd, perm, ~shared_perm);
135 
136     /* A failed blk_set_perm mustn't change perm status (locked bytes) */
137     r = blk_set_perm(blk2, perm | BLK_PERM_RESIZE, BLK_PERM_WRITE_UNCHANGED,
138                      NULL);
139     g_assert_cmpint(r, !=, 0);
140     check_locked_bytes(fd, perm, ~shared_perm);
141     blk_unref(blk1);
142     blk_unref(blk2);
143 }
144 
145 int main(int argc, char **argv)
146 {
147     bdrv_init();
148     qemu_init_main_loop(&error_abort);
149 
150     g_test_init(&argc, &argv, NULL);
151 
152     if (qemu_has_ofd_lock()) {
153         g_test_add_func("/image-locking/basic", test_image_locking_basic);
154         g_test_add_func("/image-locking/set-perm-abort", test_set_perm_abort);
155     }
156 
157     return g_test_run();
158 }
159