| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
|---|---|
| 2 | /* |
| 3 | * sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of |
| 4 | * the Linux-NTFS project. Adapted from the old NTFS driver, |
| 5 | * Copyright (C) 1997 Martin von Löwis, Régis Duchesne |
| 6 | * |
| 7 | * Copyright (c) 2002-2005 Anton Altaparmakov |
| 8 | */ |
| 9 | |
| 10 | #ifdef DEBUG |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | |
| 14 | #ifdef CONFIG_SYSCTL |
| 15 | |
| 16 | #include <linux/proc_fs.h> |
| 17 | #include <linux/sysctl.h> |
| 18 | |
| 19 | #include "sysctl.h" |
| 20 | #include "debug.h" |
| 21 | |
| 22 | /* Definition of the ntfs sysctl. */ |
| 23 | static struct ctl_table ntfs_sysctls[] = { |
| 24 | { |
| 25 | .procname = "ntfs-debug", |
| 26 | .data = &debug_msgs, /* Data pointer and size. */ |
| 27 | .maxlen = sizeof(debug_msgs), |
| 28 | .mode = 0644, /* Mode, proc handler. */ |
| 29 | .proc_handler = proc_dointvec |
| 30 | }, |
| 31 | {} |
| 32 | }; |
| 33 | |
| 34 | /* Storage for the sysctls header. */ |
| 35 | static struct ctl_table_header *sysctls_root_table; |
| 36 | |
| 37 | /** |
| 38 | * ntfs_sysctl - add or remove the debug sysctl |
| 39 | * @add: add (1) or remove (0) the sysctl |
| 40 | * |
| 41 | * Add or remove the debug sysctl. Return 0 on success or -errno on error. |
| 42 | */ |
| 43 | int ntfs_sysctl(int add) |
| 44 | { |
| 45 | if (add) { |
| 46 | BUG_ON(sysctls_root_table); |
| 47 | sysctls_root_table = register_sysctl("fs", ntfs_sysctls); |
| 48 | if (!sysctls_root_table) |
| 49 | return -ENOMEM; |
| 50 | } else { |
| 51 | BUG_ON(!sysctls_root_table); |
| 52 | unregister_sysctl_table(table: sysctls_root_table); |
| 53 | sysctls_root_table = NULL; |
| 54 | } |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | #endif /* CONFIG_SYSCTL */ |
| 59 | #endif /* DEBUG */ |
| 60 |