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/*
* sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of
* the Linux-NTFS project. Adapted from the old NTFS driver,
* Copyright (C) 1997 Martin von Löwis, Régis Duchesne
*
* Copyright (c) 2002-2005 Anton Altaparmakov
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program/include file is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (in the main directory of the Linux-NTFS
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef DEBUG
#include <linux/module.h>
#ifdef CONFIG_SYSCTL
#include <linux/proc_fs.h>
#include <linux/sysctl.h>
#include "sysctl.h"
#include "debug.h"
/* Definition of the ntfs sysctl. */
static ctl_table ntfs_sysctls[] = {
{
.ctl_name = CTL_UNNUMBERED, /* Binary and text IDs. */
.procname = "ntfs-debug",
.data = &debug_msgs, /* Data pointer and size. */
.maxlen = sizeof(debug_msgs),
.mode = 0644, /* Mode, proc handler. */
.proc_handler = &proc_dointvec
},
{}
};
/* Define the parent directory /proc/sys/fs. */
static ctl_table sysctls_root[] = {
{
.ctl_name = CTL_FS,
.procname = "fs",
.mode = 0555,
.child = ntfs_sysctls
},
{}
};
/* Storage for the sysctls header. */
static struct ctl_table_header *sysctls_root_table = NULL;
/**
* ntfs_sysctl - add or remove the debug sysctl
* @add: add (1) or remove (0) the sysctl
*
* Add or remove the debug sysctl. Return 0 on success or -errno on error.
*/
int ntfs_sysctl(int add)
{
if (add) {
BUG_ON(sysctls_root_table);
sysctls_root_table = register_sysctl_table(sysctls_root, 0);
if (!sysctls_root_table)
return -ENOMEM;
#ifdef CONFIG_PROC_FS
/*
* If the proc filesystem is in use and we are a module, need
* to set the owner of our proc entry to our module. In the
* non-modular case, THIS_MODULE is NULL, so this is ok.
*/
ntfs_sysctls[0].de->owner = THIS_MODULE;
#endif
} else {
BUG_ON(!sysctls_root_table);
unregister_sysctl_table(sysctls_root_table);
sysctls_root_table = NULL;
}
return 0;
}
#endif /* CONFIG_SYSCTL */
#endif /* DEBUG */
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