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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of
4 * the Linux-NTFS project. Adapted from the old NTFS driver,
5 * Copyright (C) 1997 Martin von Löwis, Régis Duchesne
6 *
7 * Copyright (c) 2002-2005 Anton Altaparmakov
8 */
9
10#ifdef DEBUG
11
12#include <linux/module.h>
13
14#ifdef CONFIG_SYSCTL
15
16#include <linux/proc_fs.h>
17#include <linux/sysctl.h>
18
19#include "sysctl.h"
20#include "debug.h"
21
22/* Definition of the ntfs sysctl. */
23static struct ctl_table ntfs_sysctls[] = {
24 {
25 .procname = "ntfs-debug",
26 .data = &debug_msgs, /* Data pointer and size. */
27 .maxlen = sizeof(debug_msgs),
28 .mode = 0644, /* Mode, proc handler. */
29 .proc_handler = proc_dointvec
30 },
31};
32
33/* Storage for the sysctls header. */
34static struct ctl_table_header *sysctls_root_table;
35
36/**
37 * ntfs_sysctl - add or remove the debug sysctl
38 * @add: add (1) or remove (0) the sysctl
39 *
40 * Add or remove the debug sysctl. Return 0 on success or -errno on error.
41 */
42int ntfs_sysctl(int add)
43{
44 if (add) {
45 BUG_ON(sysctls_root_table);
46 sysctls_root_table = register_sysctl("fs", ntfs_sysctls);
47 if (!sysctls_root_table)
48 return -ENOMEM;
49 } else {
50 BUG_ON(!sysctls_root_table);
51 unregister_sysctl_table(sysctls_root_table);
52 sysctls_root_table = NULL;
53 }
54 return 0;
55}
56
57#endif /* CONFIG_SYSCTL */
58#endif /* DEBUG */