1 /* 2 * sysctl.c - Code for sysctl handling in NTFS Linux kernel driver. Part of 3 * the Linux-NTFS project. Adapted from the old NTFS driver, 4 * Copyright (C) 1997 Martin von Löwis, Régis Duchesne 5 * 6 * Copyright (c) 2002-2005 Anton Altaparmakov 7 * 8 * This program/include file is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as published 10 * by the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program/include file is distributed in the hope that it will be 14 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty 15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program (in the main directory of the Linux-NTFS 20 * distribution in the file COPYING); if not, write to the Free Software 21 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 */ 23 24 #ifdef DEBUG 25 26 #include <linux/module.h> 27 28 #ifdef CONFIG_SYSCTL 29 30 #include <linux/proc_fs.h> 31 #include <linux/sysctl.h> 32 33 #include "sysctl.h" 34 #include "debug.h" 35 36 /* Definition of the ntfs sysctl. */ 37 static ctl_table ntfs_sysctls[] = { 38 { 39 .ctl_name = CTL_UNNUMBERED, /* Binary and text IDs. */ 40 .procname = "ntfs-debug", 41 .data = &debug_msgs, /* Data pointer and size. */ 42 .maxlen = sizeof(debug_msgs), 43 .mode = 0644, /* Mode, proc handler. */ 44 .proc_handler = &proc_dointvec 45 }, 46 {} 47 }; 48 49 /* Define the parent directory /proc/sys/fs. */ 50 static ctl_table sysctls_root[] = { 51 { 52 .ctl_name = CTL_FS, 53 .procname = "fs", 54 .mode = 0555, 55 .child = ntfs_sysctls 56 }, 57 {} 58 }; 59 60 /* Storage for the sysctls header. */ 61 static struct ctl_table_header *sysctls_root_table = NULL; 62 63 /** 64 * ntfs_sysctl - add or remove the debug sysctl 65 * @add: add (1) or remove (0) the sysctl 66 * 67 * Add or remove the debug sysctl. Return 0 on success or -errno on error. 68 */ 69 int ntfs_sysctl(int add) 70 { 71 if (add) { 72 BUG_ON(sysctls_root_table); 73 sysctls_root_table = register_sysctl_table(sysctls_root); 74 if (!sysctls_root_table) 75 return -ENOMEM; 76 } else { 77 BUG_ON(!sysctls_root_table); 78 unregister_sysctl_table(sysctls_root_table); 79 sysctls_root_table = NULL; 80 } 81 return 0; 82 } 83 84 #endif /* CONFIG_SYSCTL */ 85 #endif /* DEBUG */ 86