// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Code for sysctl handling in NTFS Linux kernel driver.
 *
 * Copyright (C) 1997 Martin von Löwis, Régis Duchesne
 * Copyright (c) 2002-2005 Anton Altaparmakov
 */

#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 const struct 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
        },
};

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

/*
 * 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) {
                sysctls_root_table = register_sysctl("fs/ntfs", ntfs_sysctls);
                if (!sysctls_root_table)
                        return -ENOMEM;
        } else {
                unregister_sysctl_table(sysctls_root_table);
                sysctls_root_table = NULL;
        }
        return 0;
}
#endif /* CONFIG_SYSCTL */
#endif /* DEBUG */