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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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
*/
#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 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
},
{}
};
/* Define the parent directory /proc/sys/fs. */
static struct ctl_table sysctls_root[] = {
{
.procname = "fs",
.mode = 0555,
.child = ntfs_sysctls
},
{}
};
/* 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) {
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 */
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