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
  33static 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
  55static 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
  75static 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
 116static 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
 144int 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}
 158