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 size_t len; 64 65 if ((*ppos && !write) || !*lenp) { 66 *lenp = 0; 67 return 0; 68 } 69 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf)); 70 return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len); 71 } 72 73 static int 74 proc_dodebug(ctl_table *table, int write, struct file *file, 75 void __user *buffer, size_t *lenp, loff_t *ppos) 76 { 77 char tmpbuf[20], c, *s; 78 char __user *p; 79 unsigned int value; 80 size_t left, len; 81 82 if ((*ppos && !write) || !*lenp) { 83 *lenp = 0; 84 return 0; 85 } 86 87 left = *lenp; 88 89 if (write) { 90 if (!access_ok(VERIFY_READ, buffer, left)) 91 return -EFAULT; 92 p = buffer; 93 while (left && __get_user(c, p) >= 0 && isspace(c)) 94 left--, p++; 95 if (!left) 96 goto done; 97 98 if (left > sizeof(tmpbuf) - 1) 99 return -EINVAL; 100 if (copy_from_user(tmpbuf, p, left)) 101 return -EFAULT; 102 tmpbuf[left] = '\0'; 103 104 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--) 105 value = 10 * value + (*s - '0'); 106 if (*s && !isspace(*s)) 107 return -EINVAL; 108 while (left && isspace(*s)) 109 left--, s++; 110 *(unsigned int *) table->data = value; 111 /* Display the RPC tasks on writing to rpc_debug */ 112 if (strcmp(table->procname, "rpc_debug") == 0) 113 rpc_show_tasks(); 114 } else { 115 if (!access_ok(VERIFY_WRITE, buffer, left)) 116 return -EFAULT; 117 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data); 118 if (len > left) 119 len = left; 120 if (__copy_to_user(buffer, tmpbuf, len)) 121 return -EFAULT; 122 if ((left -= len) > 0) { 123 if (put_user('\n', (char __user *)buffer + len)) 124 return -EFAULT; 125 left--; 126 } 127 } 128 129 done: 130 *lenp -= left; 131 *ppos += *lenp; 132 return 0; 133 } 134 135 136 static ctl_table debug_table[] = { 137 { 138 .procname = "rpc_debug", 139 .data = &rpc_debug, 140 .maxlen = sizeof(int), 141 .mode = 0644, 142 .proc_handler = &proc_dodebug 143 }, 144 { 145 .procname = "nfs_debug", 146 .data = &nfs_debug, 147 .maxlen = sizeof(int), 148 .mode = 0644, 149 .proc_handler = &proc_dodebug 150 }, 151 { 152 .procname = "nfsd_debug", 153 .data = &nfsd_debug, 154 .maxlen = sizeof(int), 155 .mode = 0644, 156 .proc_handler = &proc_dodebug 157 }, 158 { 159 .procname = "nlm_debug", 160 .data = &nlm_debug, 161 .maxlen = sizeof(int), 162 .mode = 0644, 163 .proc_handler = &proc_dodebug 164 }, 165 { 166 .procname = "transports", 167 .maxlen = 256, 168 .mode = 0444, 169 .proc_handler = &proc_do_xprt, 170 }, 171 { .ctl_name = 0 } 172 }; 173 174 static ctl_table sunrpc_table[] = { 175 { 176 .ctl_name = CTL_SUNRPC, 177 .procname = "sunrpc", 178 .mode = 0555, 179 .child = debug_table 180 }, 181 { .ctl_name = 0 } 182 }; 183 184 #endif 185