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 #ifndef CONFIG_NFS_USE_NEW_IDMAPPER 36 { 37 .procname = "idmap_cache_timeout", 38 .data = &nfs_idmap_cache_timeout, 39 .maxlen = sizeof(int), 40 .mode = 0644, 41 .proc_handler = proc_dointvec_jiffies, 42 }, 43 #endif /* CONFIG_NFS_USE_NEW_IDMAPPER */ 44 #endif 45 { 46 .procname = "nfs_mountpoint_timeout", 47 .data = &nfs_mountpoint_expiry_timeout, 48 .maxlen = sizeof(nfs_mountpoint_expiry_timeout), 49 .mode = 0644, 50 .proc_handler = proc_dointvec_jiffies, 51 }, 52 { 53 .procname = "nfs_congestion_kb", 54 .data = &nfs_congestion_kb, 55 .maxlen = sizeof(nfs_congestion_kb), 56 .mode = 0644, 57 .proc_handler = proc_dointvec, 58 }, 59 { } 60 }; 61 62 static ctl_table nfs_cb_sysctl_dir[] = { 63 { 64 .procname = "nfs", 65 .mode = 0555, 66 .child = nfs_cb_sysctls, 67 }, 68 { } 69 }; 70 71 static ctl_table nfs_cb_sysctl_root[] = { 72 { 73 .procname = "fs", 74 .mode = 0555, 75 .child = nfs_cb_sysctl_dir, 76 }, 77 { } 78 }; 79 80 int nfs_register_sysctl(void) 81 { 82 nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root); 83 if (nfs_callback_sysctl_table == NULL) 84 return -ENOMEM; 85 return 0; 86 } 87 88 void nfs_unregister_sysctl(void) 89 { 90 unregister_sysctl_table(nfs_callback_sysctl_table); 91 nfs_callback_sysctl_table = NULL; 92 } 93