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. */ |
23 | static 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 | |
34 | /* Storage for the sysctls header. */ |
35 | static struct ctl_table_header *sysctls_root_table; |
36 | |
37 | /** |
38 | * ntfs_sysctl - add or remove the debug sysctl |
39 | * @add: add (1) or remove (0) the sysctl |
40 | * |
41 | * Add or remove the debug sysctl. Return 0 on success or -errno on error. |
42 | */ |
43 | int ntfs_sysctl(int add) |
44 | { |
45 | if (add) { |
46 | BUG_ON(sysctls_root_table); |
47 | sysctls_root_table = register_sysctl("fs", ntfs_sysctls); |
48 | if (!sysctls_root_table) |
49 | return -ENOMEM; |
50 | } else { |
51 | BUG_ON(!sysctls_root_table); |
52 | unregister_sysctl_table(table: sysctls_root_table); |
53 | sysctls_root_table = NULL; |
54 | } |
55 | return 0; |
56 | } |
57 | |
58 | #endif /* CONFIG_SYSCTL */ |
59 | #endif /* DEBUG */ |
60 |