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 #ifdef CONFIG_NFS_V4 19 static const int nfs_set_port_min = 0; 20 static const int nfs_set_port_max = 65535; 21 #endif 22 static struct ctl_table_header *nfs_callback_sysctl_table; 23 24 static ctl_table nfs_cb_sysctls[] = { 25 #ifdef CONFIG_NFS_V4 26 { 27 .procname = "nfs_callback_tcpport", 28 .data = &nfs_callback_set_tcpport, 29 .maxlen = sizeof(int), 30 .mode = 0644, 31 .proc_handler = proc_dointvec_minmax, 32 .extra1 = (int *)&nfs_set_port_min, 33 .extra2 = (int *)&nfs_set_port_max, 34 }, 35 { 36 .procname = "idmap_cache_timeout", 37 .data = &nfs_idmap_cache_timeout, 38 .maxlen = sizeof(int), 39 .mode = 0644, 40 .proc_handler = proc_dointvec_jiffies, 41 }, 42 #endif 43 { 44 .procname = "nfs_mountpoint_timeout", 45 .data = &nfs_mountpoint_expiry_timeout, 46 .maxlen = sizeof(nfs_mountpoint_expiry_timeout), 47 .mode = 0644, 48 .proc_handler = proc_dointvec_jiffies, 49 }, 50 { 51 .procname = "nfs_congestion_kb", 52 .data = &nfs_congestion_kb, 53 .maxlen = sizeof(nfs_congestion_kb), 54 .mode = 0644, 55 .proc_handler = proc_dointvec, 56 }, 57 { } 58 }; 59 60 static ctl_table nfs_cb_sysctl_dir[] = { 61 { 62 .procname = "nfs", 63 .mode = 0555, 64 .child = nfs_cb_sysctls, 65 }, 66 { } 67 }; 68 69 static ctl_table nfs_cb_sysctl_root[] = { 70 { 71 .procname = "fs", 72 .mode = 0555, 73 .child = nfs_cb_sysctl_dir, 74 }, 75 { } 76 }; 77 78 int nfs_register_sysctl(void) 79 { 80 nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root); 81 if (nfs_callback_sysctl_table == NULL) 82 return -ENOMEM; 83 return 0; 84 } 85 86 void nfs_unregister_sysctl(void) 87 { 88 unregister_sysctl_table(nfs_callback_sysctl_table); 89 nfs_callback_sysctl_table = NULL; 90 } 91