1 /* 2 * linux/fs/nfs/sysctl.c 3 * 4 * Sysctl interface to NFS parameters 5 */ 6 #include <linux/config.h> 7 #include <linux/types.h> 8 #include <linux/linkage.h> 9 #include <linux/ctype.h> 10 #include <linux/fs.h> 11 #include <linux/sysctl.h> 12 #include <linux/module.h> 13 #include <linux/nfs4.h> 14 #include <linux/nfs_idmap.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 * Something that isn't CTL_ANY, CTL_NONE or a value that may clash. 23 * Use the same values as fs/lockd/svc.c 24 */ 25 #define CTL_UNNUMBERED -2 26 27 static ctl_table nfs_cb_sysctls[] = { 28 #ifdef CONFIG_NFS_V4 29 { 30 .ctl_name = CTL_UNNUMBERED, 31 .procname = "nfs_callback_tcpport", 32 .data = &nfs_callback_set_tcpport, 33 .maxlen = sizeof(int), 34 .mode = 0644, 35 .proc_handler = &proc_dointvec_minmax, 36 .extra1 = (int *)&nfs_set_port_min, 37 .extra2 = (int *)&nfs_set_port_max, 38 }, 39 { 40 .ctl_name = CTL_UNNUMBERED, 41 .procname = "idmap_cache_timeout", 42 .data = &nfs_idmap_cache_timeout, 43 .maxlen = sizeof(int), 44 .mode = 0644, 45 .proc_handler = &proc_dointvec_jiffies, 46 .strategy = &sysctl_jiffies, 47 }, 48 #endif 49 { .ctl_name = 0 } 50 }; 51 52 static ctl_table nfs_cb_sysctl_dir[] = { 53 { 54 .ctl_name = CTL_UNNUMBERED, 55 .procname = "nfs", 56 .mode = 0555, 57 .child = nfs_cb_sysctls, 58 }, 59 { .ctl_name = 0 } 60 }; 61 62 static ctl_table nfs_cb_sysctl_root[] = { 63 { 64 .ctl_name = CTL_FS, 65 .procname = "fs", 66 .mode = 0555, 67 .child = nfs_cb_sysctl_dir, 68 }, 69 { .ctl_name = 0 } 70 }; 71 72 int nfs_register_sysctl(void) 73 { 74 nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root, 0); 75 if (nfs_callback_sysctl_table == NULL) 76 return -ENOMEM; 77 return 0; 78 } 79 80 void nfs_unregister_sysctl(void) 81 { 82 unregister_sysctl_table(nfs_callback_sysctl_table); 83 nfs_callback_sysctl_table = NULL; 84 } 85