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 }