/*
   * linux/fs/nfs/sysctl.c
   *
   * Sysctl interface to NFS parameters
   */

  #include <linux/types.h>
  #include <linux/linkage.h>
  #include <linux/ctype.h>
  #include <linux/fs.h>
  #include <linux/sysctl.h>
  #include <linux/module.h>
  #include <linux/nfs4.h>

  #include <linux/nfs_idmap.h>

  #include <linux/nfs_fs.h>

  
  #include "callback.h"

  #ifdef CONFIG_NFS_V4

  static const int nfs_set_port_min = 0;
  static const int nfs_set_port_max = 65535;

  #endif

  static struct ctl_table_header *nfs_callback_sysctl_table;

  
  static ctl_table nfs_cb_sysctls[] = {
  #ifdef CONFIG_NFS_V4
  	{

  		.procname = "nfs_callback_tcpport",
  		.data = &nfs_callback_set_tcpport,
  		.maxlen = sizeof(int),
  		.mode = 0644,

  		.proc_handler = proc_dointvec_minmax,

  		.extra1 = (int *)&nfs_set_port_min,
  		.extra2 = (int *)&nfs_set_port_max,
  	},

  #ifndef CONFIG_NFS_USE_NEW_IDMAPPER

  	{

  		.procname = "idmap_cache_timeout",
  		.data = &nfs_idmap_cache_timeout,
  		.maxlen = sizeof(int),
  		.mode = 0644,

  		.proc_handler = proc_dointvec_jiffies,

  	},

  #endif /* CONFIG_NFS_USE_NEW_IDMAPPER */

  #endif

  	{

  		.procname	= "nfs_mountpoint_timeout",
  		.data		= &nfs_mountpoint_expiry_timeout,
  		.maxlen		= sizeof(nfs_mountpoint_expiry_timeout),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec_jiffies,

  	},

  	{

  		.procname	= "nfs_congestion_kb",
  		.data		= &nfs_congestion_kb,
  		.maxlen		= sizeof(nfs_congestion_kb),
  		.mode		= 0644,

  		.proc_handler	= proc_dointvec,

  	},

  	{ }

  };
  
  static ctl_table nfs_cb_sysctl_dir[] = {
  	{

  		.procname = "nfs",
  		.mode = 0555,
  		.child = nfs_cb_sysctls,
  	},

  	{ }

  };
  
  static ctl_table nfs_cb_sysctl_root[] = {
  	{

  		.procname = "fs",
  		.mode = 0555,
  		.child = nfs_cb_sysctl_dir,
  	},

  	{ }

  };
  
  int nfs_register_sysctl(void)
  {

  	nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);

  	if (nfs_callback_sysctl_table == NULL)
  		return -ENOMEM;
  	return 0;
  }
  
  void nfs_unregister_sysctl(void)
  {
  	unregister_sysctl_table(nfs_callback_sysctl_table);
  	nfs_callback_sysctl_table = NULL;
  }