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_jiffies, 36 }, 37 { } 38 }; 39 40 static struct ctl_table nfs4_cb_sysctl_dir[] = { 41 { 42 .procname = "nfs", 43 .mode = 0555, 44 .child = nfs4_cb_sysctls, 45 }, 46 { } 47 }; 48 49 static struct ctl_table nfs4_cb_sysctl_root[] = { 50 { 51 .procname = "fs", 52 .mode = 0555, 53 .child = nfs4_cb_sysctl_dir, 54 }, 55 { } 56 }; 57 58 int nfs4_register_sysctl(void) 59 { 60 nfs4_callback_sysctl_table = register_sysctl_table(nfs4_cb_sysctl_root); 61 if (nfs4_callback_sysctl_table == NULL) 62 return -ENOMEM; 63 return 0; 64 } 65 66 void nfs4_unregister_sysctl(void) 67 { 68 unregister_sysctl_table(nfs4_callback_sysctl_table); 69 nfs4_callback_sysctl_table = NULL; 70 } 71