// 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 */