sysctl.c

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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[] = {
    {
        .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[] = {
    {
        .procname   = "fs",
        .mode       = 0555,
        .child      = ntfs_sysctls
    },
    {}
};

/* Storage for the sysctls header. */
static struct ctl_table_header *sysctls_root_table = NULL;

int ntfs_sysctl(int add)
{
    if (add) {
        BUG_ON(sysctls_root_table);
        sysctls_root_table = register_sysctl_table(sysctls_root);
        if (!sysctls_root_table)
            return -ENOMEM;
    } else {
        BUG_ON(!sysctls_root_table);
        unregister_sysctl_table(sysctls_root_table);
        sysctls_root_table = NULL;
    }
    return 0;
}

#endif /* CONFIG_SYSCTL */
#endif /* DEBUG */