root/fs/ntfs/sysctl.c

DEFINITIONS

1. ntfs_sysctl

/*
 * 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);
                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 */