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1 /*
2  * Image locking tests
3  *
4  * Copyright (c) 2018 Red Hat Inc.
5  *
6  * Author: Fam Zheng <[email protected]>
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
33 static BlockBackend *open_image(const char *path,
34                                 uint64_t perm, uint64_t shared_perm,
35                                 Error **errp)
36 {
37     Error *local_err = NULL;
38     BlockBackend *blk;
39     QDict *options = qdict_new();
40
41     qdict_put_str(options, "driver", "raw");
42     blk = blk_new_open(path, NULL, options, BDRV_O_RDWR, &local_err);
43     if (blk) {
44         g_assert_null(local_err);
45         if (blk_set_perm(blk, perm, shared_perm, errp)) {
46             blk_unref(blk);
47             blk = NULL;
48         }
49     } else {
50         error_propagate(errp, local_err);
51     }
52     return blk;
53 }
54
55 static void check_locked_bytes(int fd, uint64_t perm_locks,
56                                uint64_t shared_perm_locks)
57 {
58     int i;
59
60     if (!perm_locks && !shared_perm_locks) {
61         g_assert(!qemu_lock_fd_test(fd, 0, 0, true));
62         return;
63     }
64     for (i = 0; (1ULL << i) <= BLK_PERM_ALL; i++) {
65         uint64_t bit = (1ULL << i);
66         bool perm_expected = !!(bit & perm_locks);
67         bool shared_perm_expected = !!(bit & shared_perm_locks);
68         g_assert_cmpint(perm_expected, ==,
69                         !!qemu_lock_fd_test(fd, 100 + i, 1, true));
70         g_assert_cmpint(shared_perm_expected, ==,
71                         !!qemu_lock_fd_test(fd, 200 + i, 1, true));
72     }
73 }
74
75 static void test_image_locking_basic(void)
76 {
77     BlockBackend *blk1, *blk2, *blk3;
78     char img_path[] = "/tmp/qtest.XXXXXX";
79     uint64_t perm, shared_perm;
80
81     int fd = mkstemp(img_path);
82     assert(fd >= 0);
83
84     perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
85     shared_perm = BLK_PERM_ALL;
86     blk1 = open_image(img_path, perm, shared_perm, &error_abort);
87     g_assert(blk1);
88
89     check_locked_bytes(fd, perm, ~shared_perm);
90
91     /* compatible perm between blk1 and blk2 */
92     blk2 = open_image(img_path, perm | BLK_PERM_RESIZE, shared_perm, NULL);
93     g_assert(blk2);
94     check_locked_bytes(fd, perm | BLK_PERM_RESIZE, ~shared_perm);
95
96     /* incompatible perm with already open blk1 and blk2 */
97     blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, NULL);
98     g_assert_null(blk3);
99
100     blk_unref(blk2);
101
102     /* Check that extra bytes in blk2 are correctly unlocked */
103     check_locked_bytes(fd, perm, ~shared_perm);
104
105     blk_unref(blk1);
106
107     /* Image is unused, no lock there */
108     check_locked_bytes(fd, 0, 0);
109     blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, &error_abort);
110     g_assert(blk3);
111     blk_unref(blk3);
112     close(fd);
113     unlink(img_path);
114 }
115
116 static void test_set_perm_abort(void)
117 {
118     BlockBackend *blk1, *blk2;
119     char img_path[] = "/tmp/qtest.XXXXXX";
120     uint64_t perm, shared_perm;
121     int r;
122     int fd = mkstemp(img_path);
123     assert(fd >= 0);
124
125     perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
126     shared_perm = BLK_PERM_ALL;
127     blk1 = open_image(img_path, perm, shared_perm, &error_abort);
128     g_assert(blk1);
129
130     blk2 = open_image(img_path, perm, shared_perm, &error_abort);
131     g_assert(blk2);
132
133     check_locked_bytes(fd, perm, ~shared_perm);
134
135     /* A failed blk_set_perm mustn't change perm status (locked bytes) */
136     r = blk_set_perm(blk2, perm | BLK_PERM_RESIZE, BLK_PERM_WRITE_UNCHANGED,
137                      NULL);
138     g_assert_cmpint(r, !=, 0);
139     check_locked_bytes(fd, perm, ~shared_perm);
140     blk_unref(blk1);
141     blk_unref(blk2);
142 }
143
144 int main(int argc, char **argv)
145 {
146     bdrv_init();
147     qemu_init_main_loop(&error_abort);
148
149     g_test_init(&argc, &argv, NULL);
150
151     if (qemu_has_ofd_lock()) {
152         g_test_add_func("/image-locking/basic", test_image_locking_basic);
153         g_test_add_func("/image-locking/set-perm-abort", test_set_perm_abort);
154     }
155
156     return g_test_run();
157 }
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