1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * linux/fs/nfs/nfs4sysctl.c
4  *
5  * Sysctl interface to NFS v4 parameters
6  *
7  * Copyright (c) 2006 Trond Myklebust <Trond.Myklebust@netapp.com>
8  */
9 #include <linux/sysctl.h>
10 #include <linux/nfs_fs.h>
11 
12 #include "nfs4_fs.h"
13 #include "nfs4idmap.h"
14 #include "callback.h"
15 
16 static const int nfs_set_port_min;
17 static const int nfs_set_port_max = 65535;
18 static struct ctl_table_header *nfs4_callback_sysctl_table;
19 
20 static struct ctl_table nfs4_cb_sysctls[] = {
21 	{
22 		.procname = "nfs_callback_tcpport",
23 		.data = &nfs_callback_set_tcpport,
24 		.maxlen = sizeof(int),
25 		.mode = 0644,
26 		.proc_handler = proc_dointvec_minmax,
27 		.extra1 = (int *)&nfs_set_port_min,
28 		.extra2 = (int *)&nfs_set_port_max,
29 	},
30 	{
31 		.procname = "idmap_cache_timeout",
32 		.data = &nfs_idmap_cache_timeout,
33 		.maxlen = sizeof(int),
34 		.mode = 0644,
35 		.proc_handler = proc_dointvec,
36 	},
37 	{ }
38 };
39 
40 static struct ctl_table nfs4_cb_sysctl_dir[] = {
41 	{
42 		.procname = "nfs",
43 		.mode = 0555,
44 		.child = nfs4_cb_sysctls,
45 	},
46 	{ }
47 };
48 
49 static struct ctl_table nfs4_cb_sysctl_root[] = {
50 	{
51 		.procname = "fs",
52 		.mode = 0555,
53 		.child = nfs4_cb_sysctl_dir,
54 	},
55 	{ }
56 };
57 
nfs4_register_sysctl(void)58 int nfs4_register_sysctl(void)
59 {
60 	nfs4_callback_sysctl_table = register_sysctl_table(nfs4_cb_sysctl_root);
61 	if (nfs4_callback_sysctl_table == NULL)
62 		return -ENOMEM;
63 	return 0;
64 }
65 
nfs4_unregister_sysctl(void)66 void nfs4_unregister_sysctl(void)
67 {
68 	unregister_sysctl_table(nfs4_callback_sysctl_table);
69 	nfs4_callback_sysctl_table = NULL;
70 }
71