tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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