aboutsummaryrefslogtreecommitdiff
path: root/tests/unit/test-image-locking.c
blob: 2624cec6a042680ca685cbd68f067aef46bd8d10 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/*
 * Image locking tests
 *
 * Copyright (c) 2018 Red Hat Inc.
 *
 * Author: Fam Zheng <famz@redhat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "block/block.h"
#include "sysemu/block-backend.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
#include "qemu/main-loop.h"

static BlockBackend *open_image(const char *path,
                                uint64_t perm, uint64_t shared_perm,
                                Error **errp)
{
    Error *local_err = NULL;
    BlockBackend *blk;
    QDict *options = qdict_new();

    qdict_put_str(options, "driver", "raw");
    blk = blk_new_open(path, NULL, options, BDRV_O_RDWR, &local_err);
    if (blk) {
        g_assert_null(local_err);
        if (blk_set_perm(blk, perm, shared_perm, errp)) {
            blk_unref(blk);
            blk = NULL;
        }
    } else {
        error_propagate(errp, local_err);
    }
    return blk;
}

static void check_locked_bytes(int fd, uint64_t perm_locks,
                               uint64_t shared_perm_locks)
{
    int i;

    if (!perm_locks && !shared_perm_locks) {
        g_assert(!qemu_lock_fd_test(fd, 0, 0, true));
        return;
    }
    for (i = 0; (1ULL << i) <= BLK_PERM_ALL; i++) {
        uint64_t bit = (1ULL << i);
        bool perm_expected = !!(bit & perm_locks);
        bool shared_perm_expected = !!(bit & shared_perm_locks);
        g_assert_cmpint(perm_expected, ==,
                        !!qemu_lock_fd_test(fd, 100 + i, 1, true));
        g_assert_cmpint(shared_perm_expected, ==,
                        !!qemu_lock_fd_test(fd, 200 + i, 1, true));
    }
}

static void test_image_locking_basic(void)
{
    BlockBackend *blk1, *blk2, *blk3;
    g_autofree char *img_path = NULL;
    uint64_t perm, shared_perm;

    int fd = g_file_open_tmp("qemu-tst-img-lock.XXXXXX", &img_path, NULL);
    assert(fd >= 0);

    perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
    shared_perm = BLK_PERM_ALL;
    blk1 = open_image(img_path, perm, shared_perm, &error_abort);
    g_assert(blk1);

    check_locked_bytes(fd, perm, ~shared_perm);

    /* compatible perm between blk1 and blk2 */
    blk2 = open_image(img_path, perm | BLK_PERM_RESIZE, shared_perm, NULL);
    g_assert(blk2);
    check_locked_bytes(fd, perm | BLK_PERM_RESIZE, ~shared_perm);

    /* incompatible perm with already open blk1 and blk2 */
    blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, NULL);
    g_assert_null(blk3);

    blk_unref(blk2);

    /* Check that extra bytes in blk2 are correctly unlocked */
    check_locked_bytes(fd, perm, ~shared_perm);

    blk_unref(blk1);

    /* Image is unused, no lock there */
    check_locked_bytes(fd, 0, 0);
    blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, &error_abort);
    g_assert(blk3);
    blk_unref(blk3);
    close(fd);
    unlink(img_path);
}

static void test_set_perm_abort(void)
{
    BlockBackend *blk1, *blk2;
    g_autofree char *img_path = NULL;
    uint64_t perm, shared_perm;
    int r;
    int fd = g_file_open_tmp("qemu-tst-img-lock.XXXXXX", &img_path, NULL);
    assert(fd >= 0);

    perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
    shared_perm = BLK_PERM_ALL;
    blk1 = open_image(img_path, perm, shared_perm, &error_abort);
    g_assert(blk1);

    blk2 = open_image(img_path, perm, shared_perm, &error_abort);
    g_assert(blk2);

    check_locked_bytes(fd, perm, ~shared_perm);

    /* A failed blk_set_perm mustn't change perm status (locked bytes) */
    r = blk_set_perm(blk2, perm | BLK_PERM_RESIZE, BLK_PERM_WRITE_UNCHANGED,
                     NULL);
    g_assert_cmpint(r, !=, 0);
    check_locked_bytes(fd, perm, ~shared_perm);
    blk_unref(blk1);
    blk_unref(blk2);
    close(fd);
    unlink(img_path);
}

int main(int argc, char **argv)
{
    bdrv_init();
    qemu_init_main_loop(&error_abort);

    g_test_init(&argc, &argv, NULL);

    if (qemu_has_ofd_lock()) {
        g_test_add_func("/image-locking/basic", test_image_locking_basic);
        g_test_add_func("/image-locking/set-perm-abort", test_set_perm_abort);
    }

    return g_test_run();
}