fs/nfs/sysctl.c

   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 static const int nfs_set_port_min = 0;
  19 static const int nfs_set_port_max = 65535;
  20 static struct ctl_table_header *nfs_callback_sysctl_table;
  21
  22 static ctl_table nfs_cb_sysctls[] = {
  23 #ifdef CONFIG_NFS_V4
  24         {
  25                 .procname = "nfs_callback_tcpport",
  26                 .data = &nfs_callback_set_tcpport,
  27                 .maxlen = sizeof(int),
  28                 .mode = 0644,
  29                 .proc_handler = &proc_dointvec_minmax,
  30                 .extra1 = (int *)&nfs_set_port_min,
  31                 .extra2 = (int *)&nfs_set_port_max,
  32         },
  33         {
  34                 .procname = "idmap_cache_timeout",
  35                 .data = &nfs_idmap_cache_timeout,
  36                 .maxlen = sizeof(int),
  37                 .mode = 0644,
  38                 .proc_handler = &proc_dointvec_jiffies,
  39         },
  40 #endif
  41         {
  42                 .procname       = "nfs_mountpoint_timeout",
  43                 .data           = &nfs_mountpoint_expiry_timeout,
  44                 .maxlen         = sizeof(nfs_mountpoint_expiry_timeout),
  45                 .mode           = 0644,
  46                 .proc_handler   = &proc_dointvec_jiffies,
  47         },
  48         {
  49                 .procname       = "nfs_congestion_kb",
  50                 .data           = &nfs_congestion_kb,
  51                 .maxlen         = sizeof(nfs_congestion_kb),
  52                 .mode           = 0644,
  53                 .proc_handler   = &proc_dointvec,
  54         },
  55         { }
  56 };
  57
  58 static ctl_table nfs_cb_sysctl_dir[] = {
  59         {
  60                 .procname = "nfs",
  61                 .mode = 0555,
  62                 .child = nfs_cb_sysctls,
  63         },
  64         { }
  65 };
  66
  67 static ctl_table nfs_cb_sysctl_root[] = {
  68         {
  69                 .procname = "fs",
  70                 .mode = 0555,
  71                 .child = nfs_cb_sysctl_dir,
  72         },
  73         { }
  74 };
  75
  76 int nfs_register_sysctl(void)
  77 {
  78         nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);
  79         if (nfs_callback_sysctl_table == NULL)
  80                 return -ENOMEM;
  81         return 0;
  82 }
  83
  84 void nfs_unregister_sysctl(void)
  85 {
  86         unregister_sysctl_table(nfs_callback_sysctl_table);
  87         nfs_callback_sysctl_table = NULL;
  88 }