158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/*
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* Image locking tests
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*
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* Copyright (c) 2018 Red Hat Inc.
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*
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* Author: Fam Zheng <famz@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "block/block.h"
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#include "sysemu/block-backend.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qdict.h"
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#include "qemu/main-loop.h"
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static BlockBackend *open_image(const char *path,
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uint64_t perm, uint64_t shared_perm,
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Error **errp)
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{
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Error *local_err = NULL;
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BlockBackend *blk;
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QDict *options = qdict_new();
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qdict_put_str(options, "driver", "raw");
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blk = blk_new_open(path, NULL, options, BDRV_O_RDWR, &local_err);
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if (blk) {
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g_assert_null(local_err);
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if (blk_set_perm(blk, perm, shared_perm, errp)) {
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blk_unref(blk);
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blk = NULL;
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}
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} else {
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error_propagate(errp, local_err);
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}
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return blk;
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}
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static void check_locked_bytes(int fd, uint64_t perm_locks,
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uint64_t shared_perm_locks)
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{
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int i;
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if (!perm_locks && !shared_perm_locks) {
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g_assert(!qemu_lock_fd_test(fd, 0, 0, true));
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return;
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}
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for (i = 0; (1ULL << i) <= BLK_PERM_ALL; i++) {
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uint64_t bit = (1ULL << i);
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bool perm_expected = !!(bit & perm_locks);
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bool shared_perm_expected = !!(bit & shared_perm_locks);
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g_assert_cmpint(perm_expected, ==,
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!!qemu_lock_fd_test(fd, 100 + i, 1, true));
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g_assert_cmpint(shared_perm_expected, ==,
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!!qemu_lock_fd_test(fd, 200 + i, 1, true));
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}
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}
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static void test_image_locking_basic(void)
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{
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BlockBackend *blk1, *blk2, *blk3;
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char img_path[] = "/tmp/qtest.XXXXXX";
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uint64_t perm, shared_perm;
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int fd = mkstemp(img_path);
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assert(fd >= 0);
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perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
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shared_perm = BLK_PERM_ALL;
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blk1 = open_image(img_path, perm, shared_perm, &error_abort);
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g_assert(blk1);
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check_locked_bytes(fd, perm, ~shared_perm);
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/* compatible perm between blk1 and blk2 */
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blk2 = open_image(img_path, perm | BLK_PERM_RESIZE, shared_perm, NULL);
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g_assert(blk2);
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check_locked_bytes(fd, perm | BLK_PERM_RESIZE, ~shared_perm);
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/* incompatible perm with already open blk1 and blk2 */
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blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, NULL);
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g_assert_null(blk3);
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blk_unref(blk2);
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/* Check that extra bytes in blk2 are correctly unlocked */
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check_locked_bytes(fd, perm, ~shared_perm);
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blk_unref(blk1);
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/* Image is unused, no lock there */
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check_locked_bytes(fd, 0, 0);
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blk3 = open_image(img_path, perm, BLK_PERM_WRITE_UNCHANGED, &error_abort);
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g_assert(blk3);
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blk_unref(blk3);
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close(fd);
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unlink(img_path);
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}
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static void test_set_perm_abort(void)
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{
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BlockBackend *blk1, *blk2;
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char img_path[] = "/tmp/qtest.XXXXXX";
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uint64_t perm, shared_perm;
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int r;
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int fd = mkstemp(img_path);
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assert(fd >= 0);
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perm = BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ;
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shared_perm = BLK_PERM_ALL;
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blk1 = open_image(img_path, perm, shared_perm, &error_abort);
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g_assert(blk1);
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blk2 = open_image(img_path, perm, shared_perm, &error_abort);
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g_assert(blk2);
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check_locked_bytes(fd, perm, ~shared_perm);
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/* A failed blk_set_perm mustn't change perm status (locked bytes) */
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r = blk_set_perm(blk2, perm | BLK_PERM_RESIZE, BLK_PERM_WRITE_UNCHANGED,
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NULL);
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g_assert_cmpint(r, !=, 0);
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check_locked_bytes(fd, perm, ~shared_perm);
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blk_unref(blk1);
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blk_unref(blk2);
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}
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int main(int argc, char **argv)
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{
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bdrv_init();
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qemu_init_main_loop(&error_abort);
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g_test_init(&argc, &argv, NULL);
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if (qemu_has_ofd_lock()) {
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g_test_add_func("/image-locking/basic", test_image_locking_basic);
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g_test_add_func("/image-locking/set-perm-abort", test_set_perm_abort);
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}
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return g_test_run();
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}
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