1 /* 2 * linux/net/sunrpc/sysctl.c 3 * 4 * Sysctl interface to sunrpc module. 5 * 6 * I would prefer to register the sunrpc table below sys/net, but that's 7 * impossible at the moment. 8 */ 9 10 #include <linux/types.h> 11 #include <linux/linkage.h> 12 #include <linux/ctype.h> 13 #include <linux/fs.h> 14 #include <linux/sysctl.h> 15 #include <linux/module.h> 16 17 #include <asm/uaccess.h> 18 #include <linux/sunrpc/types.h> 19 #include <linux/sunrpc/sched.h> 20 #include <linux/sunrpc/stats.h> 21 #include <linux/sunrpc/svc_xprt.h> 22 23 /* 24 * Declare the debug flags here 25 */ 26 unsigned int rpc_debug; 27 EXPORT_SYMBOL_GPL(rpc_debug); 28 29 unsigned int nfs_debug; 30 EXPORT_SYMBOL_GPL(nfs_debug); 31 32 unsigned int nfsd_debug; 33 EXPORT_SYMBOL_GPL(nfsd_debug); 34 35 unsigned int nlm_debug; 36 EXPORT_SYMBOL_GPL(nlm_debug); 37 38 #ifdef RPC_DEBUG 39 40 static struct ctl_table_header *sunrpc_table_header; 41 static ctl_table sunrpc_table[]; 42 43 void 44 rpc_register_sysctl(void) 45 { 46 if (!sunrpc_table_header) 47 sunrpc_table_header = register_sysctl_table(sunrpc_table); 48 } 49 50 void 51 rpc_unregister_sysctl(void) 52 { 53 if (sunrpc_table_header) { 54 unregister_sysctl_table(sunrpc_table_header); 55 sunrpc_table_header = NULL; 56 } 57 } 58 59 static int proc_do_xprt(ctl_table *table, int write, struct file *file, 60 void __user *buffer, size_t *lenp, loff_t *ppos) 61 { 62 char tmpbuf[256]; 63 int len; 64 if ((*ppos && !write) || !*lenp) { 65 *lenp = 0; 66 return 0; 67 } 68 if (write) 69 return -EINVAL; 70 else { 71 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf)); 72 if (!access_ok(VERIFY_WRITE, buffer, len)) 73 return -EFAULT; 74 75 if (__copy_to_user(buffer, tmpbuf, len)) 76 return -EFAULT; 77 } 78 *lenp -= len; 79 *ppos += len; 80 return 0; 81 } 82 83 static int 84 proc_dodebug(ctl_table *table, int write, struct file *file, 85 void __user *buffer, size_t *lenp, loff_t *ppos) 86 { 87 char tmpbuf[20], c, *s; 88 char __user *p; 89 unsigned int value; 90 size_t left, len; 91 92 if ((*ppos && !write) || !*lenp) { 93 *lenp = 0; 94 return 0; 95 } 96 97 left = *lenp; 98 99 if (write) { 100 if (!access_ok(VERIFY_READ, buffer, left)) 101 return -EFAULT; 102 p = buffer; 103 while (left && __get_user(c, p) >= 0 && isspace(c)) 104 left--, p++; 105 if (!left) 106 goto done; 107 108 if (left > sizeof(tmpbuf) - 1) 109 return -EINVAL; 110 if (copy_from_user(tmpbuf, p, left)) 111 return -EFAULT; 112 tmpbuf[left] = '\0'; 113 114 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--) 115 value = 10 * value + (*s - '0'); 116 if (*s && !isspace(*s)) 117 return -EINVAL; 118 while (left && isspace(*s)) 119 left--, s++; 120 *(unsigned int *) table->data = value; 121 /* Display the RPC tasks on writing to rpc_debug */ 122 if (strcmp(table->procname, "rpc_debug") == 0) 123 rpc_show_tasks(); 124 } else { 125 if (!access_ok(VERIFY_WRITE, buffer, left)) 126 return -EFAULT; 127 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data); 128 if (len > left) 129 len = left; 130 if (__copy_to_user(buffer, tmpbuf, len)) 131 return -EFAULT; 132 if ((left -= len) > 0) { 133 if (put_user('\n', (char __user *)buffer + len)) 134 return -EFAULT; 135 left--; 136 } 137 } 138 139 done: 140 *lenp -= left; 141 *ppos += *lenp; 142 return 0; 143 } 144 145 146 static ctl_table debug_table[] = { 147 { 148 .procname = "rpc_debug", 149 .data = &rpc_debug, 150 .maxlen = sizeof(int), 151 .mode = 0644, 152 .proc_handler = &proc_dodebug 153 }, 154 { 155 .procname = "nfs_debug", 156 .data = &nfs_debug, 157 .maxlen = sizeof(int), 158 .mode = 0644, 159 .proc_handler = &proc_dodebug 160 }, 161 { 162 .procname = "nfsd_debug", 163 .data = &nfsd_debug, 164 .maxlen = sizeof(int), 165 .mode = 0644, 166 .proc_handler = &proc_dodebug 167 }, 168 { 169 .procname = "nlm_debug", 170 .data = &nlm_debug, 171 .maxlen = sizeof(int), 172 .mode = 0644, 173 .proc_handler = &proc_dodebug 174 }, 175 { 176 .procname = "transports", 177 .maxlen = 256, 178 .mode = 0444, 179 .proc_handler = &proc_do_xprt, 180 }, 181 { .ctl_name = 0 } 182 }; 183 184 static ctl_table sunrpc_table[] = { 185 { 186 .ctl_name = CTL_SUNRPC, 187 .procname = "sunrpc", 188 .mode = 0555, 189 .child = debug_table 190 }, 191 { .ctl_name = 0 } 192 }; 193 194 #endif 195