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 34 static 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 56 static 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 76 static void test_image_locking_basic(void) 77 { 78 BlockBackend *blk1, *blk2, *blk3; 79 g_autofree char *img_path = NULL; 80 uint64_t perm, shared_perm; 81 82 int fd = g_file_open_tmp("qtest.XXXXXX", &img_path, NULL); 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 } 116 117 static void test_set_perm_abort(void) 118 { 119 BlockBackend *blk1, *blk2; 120 g_autofree char *img_path = NULL; 121 uint64_t perm, shared_perm; 122 int r; 123 int fd = g_file_open_tmp("qtest.XXXXXX", &img_path, NULL); 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 } 144 145 int 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