1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of
4*4882a593Smuzhiyun * the Linux-NTFS project. Adapted from the old NTFS driver,
5*4882a593Smuzhiyun * Copyright (C) 1997 Martin von Löwis, Régis Duchesne
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (c) 2002-2005 Anton Altaparmakov
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #ifdef DEBUG
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/module.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #ifdef CONFIG_SYSCTL
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include <linux/proc_fs.h>
17*4882a593Smuzhiyun #include <linux/sysctl.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include "sysctl.h"
20*4882a593Smuzhiyun #include "debug.h"
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* Definition of the ntfs sysctl. */
23*4882a593Smuzhiyun static struct ctl_table ntfs_sysctls[] = {
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun .procname = "ntfs-debug",
26*4882a593Smuzhiyun .data = &debug_msgs, /* Data pointer and size. */
27*4882a593Smuzhiyun .maxlen = sizeof(debug_msgs),
28*4882a593Smuzhiyun .mode = 0644, /* Mode, proc handler. */
29*4882a593Smuzhiyun .proc_handler = proc_dointvec
30*4882a593Smuzhiyun },
31*4882a593Smuzhiyun {}
32*4882a593Smuzhiyun };
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun /* Define the parent directory /proc/sys/fs. */
35*4882a593Smuzhiyun static struct ctl_table sysctls_root[] = {
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun .procname = "fs",
38*4882a593Smuzhiyun .mode = 0555,
39*4882a593Smuzhiyun .child = ntfs_sysctls
40*4882a593Smuzhiyun },
41*4882a593Smuzhiyun {}
42*4882a593Smuzhiyun };
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun /* Storage for the sysctls header. */
45*4882a593Smuzhiyun static struct ctl_table_header *sysctls_root_table;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /**
48*4882a593Smuzhiyun * ntfs_sysctl - add or remove the debug sysctl
49*4882a593Smuzhiyun * @add: add (1) or remove (0) the sysctl
50*4882a593Smuzhiyun *
51*4882a593Smuzhiyun * Add or remove the debug sysctl. Return 0 on success or -errno on error.
52*4882a593Smuzhiyun */
ntfs_sysctl(int add)53*4882a593Smuzhiyun int ntfs_sysctl(int add)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun if (add) {
56*4882a593Smuzhiyun BUG_ON(sysctls_root_table);
57*4882a593Smuzhiyun sysctls_root_table = register_sysctl_table(sysctls_root);
58*4882a593Smuzhiyun if (!sysctls_root_table)
59*4882a593Smuzhiyun return -ENOMEM;
60*4882a593Smuzhiyun } else {
61*4882a593Smuzhiyun BUG_ON(!sysctls_root_table);
62*4882a593Smuzhiyun unregister_sysctl_table(sysctls_root_table);
63*4882a593Smuzhiyun sysctls_root_table = NULL;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun return 0;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun #endif /* CONFIG_SYSCTL */
69*4882a593Smuzhiyun #endif /* DEBUG */
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