tests/test-image-locking.c

   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
  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 }