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a1d312de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
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, | |
96de0e25 | 5 | * Copyright (C) 1997 Martin von Löwis, Régis Duchesne |
1da177e4 | 6 | * |
c002f425 | 7 | * Copyright (c) 2002-2005 Anton Altaparmakov |
1da177e4 LT |
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 | ||
1da177e4 | 22 | /* Definition of the ntfs sysctl. */ |
5eccdf39 | 23 | static struct ctl_table ntfs_sysctls[] = { |
4ed075e9 | 24 | { |
4ed075e9 EB |
25 | .procname = "ntfs-debug", |
26 | .data = &debug_msgs, /* Data pointer and size. */ | |
27 | .maxlen = sizeof(debug_msgs), | |
28 | .mode = 0644, /* Mode, proc handler. */ | |
6d456111 | 29 | .proc_handler = proc_dointvec |
4ed075e9 EB |
30 | }, |
31 | {} | |
1da177e4 LT |
32 | }; |
33 | ||
34 | /* Define the parent directory /proc/sys/fs. */ | |
5eccdf39 | 35 | static struct ctl_table sysctls_root[] = { |
4ed075e9 | 36 | { |
4ed075e9 EB |
37 | .procname = "fs", |
38 | .mode = 0555, | |
39 | .child = ntfs_sysctls | |
40 | }, | |
41 | {} | |
1da177e4 LT |
42 | }; |
43 | ||
44 | /* Storage for the sysctls header. */ | |
504e0e2f | 45 | static struct ctl_table_header *sysctls_root_table; |
1da177e4 LT |
46 | |
47 | /** | |
48 | * ntfs_sysctl - add or remove the debug sysctl | |
49 | * @add: add (1) or remove (0) the sysctl | |
50 | * | |
51 | * Add or remove the debug sysctl. Return 0 on success or -errno on error. | |
52 | */ | |
53 | int ntfs_sysctl(int add) | |
54 | { | |
55 | if (add) { | |
56 | BUG_ON(sysctls_root_table); | |
0b4d4147 | 57 | sysctls_root_table = register_sysctl_table(sysctls_root); |
1da177e4 LT |
58 | if (!sysctls_root_table) |
59 | return -ENOMEM; | |
1da177e4 LT |
60 | } else { |
61 | BUG_ON(!sysctls_root_table); | |
62 | unregister_sysctl_table(sysctls_root_table); | |
63 | sysctls_root_table = NULL; | |
64 | } | |
65 | return 0; | |
66 | } | |
67 | ||
68 | #endif /* CONFIG_SYSCTL */ | |
69 | #endif /* DEBUG */ |