1 /*
2 * linux/fs/nfs/sysctl.c
3 *
4 * Sysctl interface to NFS parameters
5 */
6 #include <linux/types.h>
7 #include <linux/linkage.h>
8 #include <linux/ctype.h>
9 #include <linux/fs.h>
10 #include <linux/sysctl.h>
11 #include <linux/module.h>
12 #include <linux/nfs4.h>
13 #include <linux/nfs_idmap.h>
14 #include <linux/nfs_fs.h>
15
16 #include "callback.h"
17
18 #ifdef CONFIG_NFS_V4
19 static const int nfs_set_port_min = 0;
20 static const int nfs_set_port_max = 65535;
21 #endif
22 static struct ctl_table_header *nfs_callback_sysctl_table;
23
24 static ctl_table nfs_cb_sysctls[] = {
25 #ifdef CONFIG_NFS_V4
26 {
27 .procname = "nfs_callback_tcpport",
28 .data = &nfs_callback_set_tcpport,
29 .maxlen = sizeof(int),
30 .mode = 0644,
31 .proc_handler = proc_dointvec_minmax,
32 .extra1 = (int *)&nfs_set_port_min,
33 .extra2 = (int *)&nfs_set_port_max,
34 },
35 {
36 .procname = "idmap_cache_timeout",
37 .data = &nfs_idmap_cache_timeout,
38 .maxlen = sizeof(int),
39 .mode = 0644,
40 .proc_handler = proc_dointvec_jiffies,
41 },
42 #endif
43 {
44 .procname = "nfs_mountpoint_timeout",
45 .data = &nfs_mountpoint_expiry_timeout,
46 .maxlen = sizeof(nfs_mountpoint_expiry_timeout),
47 .mode = 0644,
48 .proc_handler = proc_dointvec_jiffies,
49 },
50 {
51 .procname = "nfs_congestion_kb",
52 .data = &nfs_congestion_kb,
53 .maxlen = sizeof(nfs_congestion_kb),
54 .mode = 0644,
55 .proc_handler = proc_dointvec,
56 },
57 { }
58 };
59
60 static ctl_table nfs_cb_sysctl_dir[] = {
61 {
62 .procname = "nfs",
63 .mode = 0555,
64 .child = nfs_cb_sysctls,
65 },
66 { }
67 };
68
69 static ctl_table nfs_cb_sysctl_root[] = {
70 {
71 .procname = "fs",
72 .mode = 0555,
73 .child = nfs_cb_sysctl_dir,
74 },
75 { }
76 };
77
nfs_register_sysctl(void)78 int nfs_register_sysctl(void)
79 {
80 nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);
81 if (nfs_callback_sysctl_table == NULL)
82 return -ENOMEM;
83 return 0;
84 }
85
nfs_unregister_sysctl(void)86 void nfs_unregister_sysctl(void)
87 {
88 unregister_sysctl_table(nfs_callback_sysctl_table);
89 nfs_callback_sysctl_table = NULL;
90 }
91