fs/nfs/nfs4sysctl.c

   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 int nfs4_register_sysctl(void)
  40 {
  41         nfs4_callback_sysctl_table = register_sysctl("fs/nfs",
  42                                                      nfs4_cb_sysctls);
  43         if (nfs4_callback_sysctl_table == NULL)
  44                 return -ENOMEM;
  45         return 0;
  46 }
  47
  48 void nfs4_unregister_sysctl(void)
  49 {
  50         unregister_sysctl_table(nfs4_callback_sysctl_table);
  51         nfs4_callback_sysctl_table = NULL;
  52 }