NFS: Add timeout to submounts
[linux-2.6.git] / fs / nfs / sysctl.c
1 /*
2  * linux/fs/nfs/sysctl.c
3  *
4  * Sysctl interface to NFS parameters
5  */
6 #include <linux/config.h>
7 #include <linux/types.h>
8 #include <linux/linkage.h>
9 #include <linux/ctype.h>
10 #include <linux/fs.h>
11 #include <linux/sysctl.h>
12 #include <linux/module.h>
13 #include <linux/nfs4.h>
14 #include <linux/nfs_idmap.h>
15 #include <linux/nfs_fs.h>
16
17 #include "callback.h"
18
19 static const int nfs_set_port_min = 0;
20 static const int nfs_set_port_max = 65535;
21 static struct ctl_table_header *nfs_callback_sysctl_table;
22 /*
23  * Something that isn't CTL_ANY, CTL_NONE or a value that may clash.
24  * Use the same values as fs/lockd/svc.c
25  */
26 #define CTL_UNNUMBERED -2
27
28 static ctl_table nfs_cb_sysctls[] = {
29 #ifdef CONFIG_NFS_V4
30         {
31                 .ctl_name = CTL_UNNUMBERED,
32                 .procname = "nfs_callback_tcpport",
33                 .data = &nfs_callback_set_tcpport,
34                 .maxlen = sizeof(int),
35                 .mode = 0644,
36                 .proc_handler = &proc_dointvec_minmax,
37                 .extra1 = (int *)&nfs_set_port_min,
38                 .extra2 = (int *)&nfs_set_port_max,
39         },
40         {
41                 .ctl_name = CTL_UNNUMBERED,
42                 .procname = "idmap_cache_timeout",
43                 .data = &nfs_idmap_cache_timeout,
44                 .maxlen = sizeof(int),
45                 .mode = 0644,
46                 .proc_handler = &proc_dointvec_jiffies,
47                 .strategy = &sysctl_jiffies,
48         },
49 #endif
50         {
51                 .ctl_name       = CTL_UNNUMBERED,
52                 .procname       = "nfs_mountpoint_timeout",
53                 .data           = &nfs_mountpoint_expiry_timeout,
54                 .maxlen         = sizeof(nfs_mountpoint_expiry_timeout),
55                 .mode           = 0644,
56                 .proc_handler   = &proc_dointvec_jiffies,
57                 .strategy       = &sysctl_jiffies,
58         },
59         { .ctl_name = 0 }
60 };
61
62 static ctl_table nfs_cb_sysctl_dir[] = {
63         {
64                 .ctl_name = CTL_UNNUMBERED,
65                 .procname = "nfs",
66                 .mode = 0555,
67                 .child = nfs_cb_sysctls,
68         },
69         { .ctl_name = 0 }
70 };
71
72 static ctl_table nfs_cb_sysctl_root[] = {
73         {
74                 .ctl_name = CTL_FS,
75                 .procname = "fs",
76                 .mode = 0555,
77                 .child = nfs_cb_sysctl_dir,
78         },
79         { .ctl_name = 0 }
80 };
81
82 int nfs_register_sysctl(void)
83 {
84         nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root, 0);
85         if (nfs_callback_sysctl_table == NULL)
86                 return -ENOMEM;
87         return 0;
88 }
89
90 void nfs_unregister_sysctl(void)
91 {
92         unregister_sysctl_table(nfs_callback_sysctl_table);
93         nfs_callback_sysctl_table = NULL;
94 }