LXR qemu/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#include "qemu/main-loop.h"
  33
  34static 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
  56static 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
  76static 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
 117static 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
 145int 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