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