// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of
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* the Linux-NTFS project. Adapted from the old NTFS driver,
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* Copyright (C) 1997 Martin von Löwis, Régis Duchesne
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*
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* Copyright (c) 2002-2005 Anton Altaparmakov
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*/
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#ifdef DEBUG
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#include <linux/module.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/proc_fs.h>
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#include <linux/sysctl.h>
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#include "sysctl.h"
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#include "debug.h"
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/* Definition of the ntfs sysctl. */
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static struct ctl_table ntfs_sysctls[] = {
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{
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.procname = "ntfs-debug",
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.data = &debug_msgs, /* Data pointer and size. */
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.maxlen = sizeof(debug_msgs),
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.mode = 0644, /* Mode, proc handler. */
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.proc_handler = proc_dointvec
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},
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{}
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};
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/* Define the parent directory /proc/sys/fs. */
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static struct ctl_table sysctls_root[] = {
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{
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.procname = "fs",
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.mode = 0555,
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.child = ntfs_sysctls
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},
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{}
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};
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/* Storage for the sysctls header. */
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static struct ctl_table_header *sysctls_root_table;
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/**
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* ntfs_sysctl - add or remove the debug sysctl
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* @add: add (1) or remove (0) the sysctl
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*
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* Add or remove the debug sysctl. Return 0 on success or -errno on error.
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*/
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int ntfs_sysctl(int add)
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{
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if (add) {
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BUG_ON(sysctls_root_table);
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sysctls_root_table = register_sysctl_table(sysctls_root);
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if (!sysctls_root_table)
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return -ENOMEM;
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} else {
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BUG_ON(!sysctls_root_table);
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unregister_sysctl_table(sysctls_root_table);
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sysctls_root_table = NULL;
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}
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return 0;
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}
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#endif /* CONFIG_SYSCTL */
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#endif /* DEBUG */
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