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/*
* 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"
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();
}
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