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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of
3 * the Linux-NTFS project. Adapted from the old NTFS driver,
4 * Copyright (C) 1997 Martin von Löwis, Régis Duchesne
5 *
Anton Altaparmakovc002f422005-02-03 12:02:56 +00006 * Copyright (c) 2002-2005 Anton Altaparmakov
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * This program/include file is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as published
10 * by the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program/include file is distributed in the hope that it will be
14 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program (in the main directory of the Linux-NTFS
20 * distribution in the file COPYING); if not, write to the Free Software
21 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#ifdef DEBUG
25
26#include <linux/module.h>
27
28#ifdef CONFIG_SYSCTL
29
30#include <linux/proc_fs.h>
31#include <linux/sysctl.h>
32
33#include "sysctl.h"
34#include "debug.h"
35
36#define FS_NTFS 1
37
38/* Definition of the ntfs sysctl. */
39static ctl_table ntfs_sysctls[] = {
40 { FS_NTFS, "ntfs-debug", /* Binary and text IDs. */
41 &debug_msgs,sizeof(debug_msgs), /* Data pointer and size. */
42 0644, NULL, &proc_dointvec }, /* Mode, child, proc handler. */
43 { 0 }
44};
45
46/* Define the parent directory /proc/sys/fs. */
47static ctl_table sysctls_root[] = {
48 { CTL_FS, "fs", NULL, 0, 0555, ntfs_sysctls },
49 { 0 }
50};
51
52/* Storage for the sysctls header. */
53static struct ctl_table_header *sysctls_root_table = NULL;
54
55/**
56 * ntfs_sysctl - add or remove the debug sysctl
57 * @add: add (1) or remove (0) the sysctl
58 *
59 * Add or remove the debug sysctl. Return 0 on success or -errno on error.
60 */
61int ntfs_sysctl(int add)
62{
63 if (add) {
64 BUG_ON(sysctls_root_table);
65 sysctls_root_table = register_sysctl_table(sysctls_root, 0);
66 if (!sysctls_root_table)
67 return -ENOMEM;
68#ifdef CONFIG_PROC_FS
69 /*
Anton Altaparmakovc002f422005-02-03 12:02:56 +000070 * If the proc filesystem is in use and we are a module, need
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 * to set the owner of our proc entry to our module. In the
72 * non-modular case, THIS_MODULE is NULL, so this is ok.
73 */
74 ntfs_sysctls[0].de->owner = THIS_MODULE;
75#endif
76 } else {
77 BUG_ON(!sysctls_root_table);
78 unregister_sysctl_table(sysctls_root_table);
79 sysctls_root_table = NULL;
80 }
81 return 0;
82}
83
84#endif /* CONFIG_SYSCTL */
85#endif /* DEBUG */