fs/nfs/nfs4sysctl.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * linux/fs/nfs/nfs4sysctl.c
0004  *
0005  * Sysctl interface to NFS v4 parameters
0006  *
0007  * Copyright (c) 2006 Trond Myklebust <Trond.Myklebust@netapp.com>
0008  */
0009 #include <linux/sysctl.h>
0010 #include <linux/nfs_fs.h>
0011
0012 #include "nfs4_fs.h"
0013 #include "nfs4idmap.h"
0014 #include "callback.h"
0015
0016 static const int nfs_set_port_min;
0017 static const int nfs_set_port_max = 65535;
0018 static struct ctl_table_header *nfs4_callback_sysctl_table;
0019
0020 static struct ctl_table nfs4_cb_sysctls[] = {
0021     {
0022         .procname = "nfs_callback_tcpport",
0023         .data = &nfs_callback_set_tcpport,
0024         .maxlen = sizeof(int),
0025         .mode = 0644,
0026         .proc_handler = proc_dointvec_minmax,
0027         .extra1 = (int *)&nfs_set_port_min,
0028         .extra2 = (int *)&nfs_set_port_max,
0029     },
0030     {
0031         .procname = "idmap_cache_timeout",
0032         .data = &nfs_idmap_cache_timeout,
0033         .maxlen = sizeof(int),
0034         .mode = 0644,
0035         .proc_handler = proc_dointvec,
0036     },
0037     { }
0038 };
0039
0040 static struct ctl_table nfs4_cb_sysctl_dir[] = {
0041     {
0042         .procname = "nfs",
0043         .mode = 0555,
0044         .child = nfs4_cb_sysctls,
0045     },
0046     { }
0047 };
0048
0049 static struct ctl_table nfs4_cb_sysctl_root[] = {
0050     {
0051         .procname = "fs",
0052         .mode = 0555,
0053         .child = nfs4_cb_sysctl_dir,
0054     },
0055     { }
0056 };
0057
0058 int nfs4_register_sysctl(void)
0059 {
0060     nfs4_callback_sysctl_table = register_sysctl_table(nfs4_cb_sysctl_root);
0061     if (nfs4_callback_sysctl_table == NULL)
0062         return -ENOMEM;
0063     return 0;
0064 }
0065
0066 void nfs4_unregister_sysctl(void)
0067 {
0068     unregister_sysctl_table(nfs4_callback_sysctl_table);
0069     nfs4_callback_sysctl_table = NULL;
0070 }