/* * 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; char img_path[] = "/tmp/qtest.XXXXXX"; uint64_t perm, shared_perm; int fd = mkstemp(img_path); 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; char img_path[] = "/tmp/qtest.XXXXXX"; uint64_t perm, shared_perm; int r; int fd = mkstemp(img_path); 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); } 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(); }