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 22 /* 23 * Declare the debug flags here 24 */ 25 unsigned int rpc_debug; 26 unsigned int nfs_debug; 27 unsigned int nfsd_debug; 28 unsigned int nlm_debug; 29 30 #ifdef RPC_DEBUG 31 32 static struct ctl_table_header *sunrpc_table_header; 33 static ctl_table sunrpc_table[]; 34 35 void 36 rpc_register_sysctl(void) 37 { 38 if (!sunrpc_table_header) 39 sunrpc_table_header = register_sysctl_table(sunrpc_table); 40 } 41 42 void 43 rpc_unregister_sysctl(void) 44 { 45 if (sunrpc_table_header) { 46 unregister_sysctl_table(sunrpc_table_header); 47 sunrpc_table_header = NULL; 48 } 49 } 50 51 static int 52 proc_dodebug(ctl_table *table, int write, struct file *file, 53 void __user *buffer, size_t *lenp, loff_t *ppos) 54 { 55 char tmpbuf[20], c, *s; 56 char __user *p; 57 unsigned int value; 58 size_t left, len; 59 60 if ((*ppos && !write) || !*lenp) { 61 *lenp = 0; 62 return 0; 63 } 64 65 left = *lenp; 66 67 if (write) { 68 if (!access_ok(VERIFY_READ, buffer, left)) 69 return -EFAULT; 70 p = buffer; 71 while (left && __get_user(c, p) >= 0 && isspace(c)) 72 left--, p++; 73 if (!left) 74 goto done; 75 76 if (left > sizeof(tmpbuf) - 1) 77 return -EINVAL; 78 if (copy_from_user(tmpbuf, p, left)) 79 return -EFAULT; 80 tmpbuf[left] = '\0'; 81 82 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--) 83 value = 10 * value + (*s - '0'); 84 if (*s && !isspace(*s)) 85 return -EINVAL; 86 while (left && isspace(*s)) 87 left--, s++; 88 *(unsigned int *) table->data = value; 89 /* Display the RPC tasks on writing to rpc_debug */ 90 if (strcmp(table->procname, "rpc_debug") == 0) 91 rpc_show_tasks(); 92 } else { 93 if (!access_ok(VERIFY_WRITE, buffer, left)) 94 return -EFAULT; 95 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data); 96 if (len > left) 97 len = left; 98 if (__copy_to_user(buffer, tmpbuf, len)) 99 return -EFAULT; 100 if ((left -= len) > 0) { 101 if (put_user('\n', (char __user *)buffer + len)) 102 return -EFAULT; 103 left--; 104 } 105 } 106 107 done: 108 *lenp -= left; 109 *ppos += *lenp; 110 return 0; 111 } 112 113 114 static ctl_table debug_table[] = { 115 { 116 .procname = "rpc_debug", 117 .data = &rpc_debug, 118 .maxlen = sizeof(int), 119 .mode = 0644, 120 .proc_handler = &proc_dodebug 121 }, 122 { 123 .procname = "nfs_debug", 124 .data = &nfs_debug, 125 .maxlen = sizeof(int), 126 .mode = 0644, 127 .proc_handler = &proc_dodebug 128 }, 129 { 130 .procname = "nfsd_debug", 131 .data = &nfsd_debug, 132 .maxlen = sizeof(int), 133 .mode = 0644, 134 .proc_handler = &proc_dodebug 135 }, 136 { 137 .procname = "nlm_debug", 138 .data = &nlm_debug, 139 .maxlen = sizeof(int), 140 .mode = 0644, 141 .proc_handler = &proc_dodebug 142 }, 143 { .ctl_name = 0 } 144 }; 145 146 static ctl_table sunrpc_table[] = { 147 { 148 .ctl_name = CTL_SUNRPC, 149 .procname = "sunrpc", 150 .mode = 0555, 151 .child = debug_table 152 }, 153 { .ctl_name = 0 } 154 }; 155 156 #endif 157