listmount_test.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2// Copyright (c) 2024 Christian Brauner <brauner@kernel.org>
 3
 4#define _GNU_SOURCE
 5#include <fcntl.h>
 6#include <sched.h>
 7#include <stdio.h>
 8#include <string.h>
 9#include <sys/stat.h>
10#include <sys/mount.h>
11#include <unistd.h>
12
13#include "statmount.h"
14#include "kselftest_harness.h"
15
16#ifndef LISTMOUNT_REVERSE
17#define LISTMOUNT_REVERSE    (1 << 0) /* List later mounts first */
18#endif
19
20#define LISTMNT_BUFFER 10
21
22/* Check that all mount ids are in increasing order. */
23TEST(listmount_forward)
24{
25	uint64_t list[LISTMNT_BUFFER], last_mnt_id = 0;
26
27	for (;;) {
28		ssize_t nr_mounts;
29
30		nr_mounts = listmount(LSMT_ROOT, 0, last_mnt_id,
31				      list, LISTMNT_BUFFER, 0);
32		ASSERT_GE(nr_mounts, 0);
33		if (nr_mounts == 0)
34			break;
35
36		for (size_t cur = 0; cur < nr_mounts; cur++) {
37			if (cur < nr_mounts - 1)
38				ASSERT_LT(list[cur], list[cur + 1]);
39			last_mnt_id = list[cur];
40		}
41	}
42}
43
44/* Check that all mount ids are in decreasing order. */
45TEST(listmount_backward)
46{
47	uint64_t list[LISTMNT_BUFFER], last_mnt_id = 0;
48
49	for (;;) {
50		ssize_t nr_mounts;
51
52		nr_mounts = listmount(LSMT_ROOT, 0, last_mnt_id,
53				      list, LISTMNT_BUFFER, LISTMOUNT_REVERSE);
54		ASSERT_GE(nr_mounts, 0);
55		if (nr_mounts == 0)
56			break;
57
58		for (size_t cur = 0; cur < nr_mounts; cur++) {
59			if (cur < nr_mounts - 1)
60				ASSERT_GT(list[cur], list[cur + 1]);
61			last_mnt_id = list[cur];
62		}
63	}
64}
65
66TEST_HARNESS_MAIN