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, 1); 40 #ifdef CONFIG_PROC_FS 41 if (sunrpc_table[0].de) 42 sunrpc_table[0].de->owner = THIS_MODULE; 43 #endif 44 } 45 46 } 47 48 void 49 rpc_unregister_sysctl(void) 50 { 51 if (sunrpc_table_header) { 52 unregister_sysctl_table(sunrpc_table_header); 53 sunrpc_table_header = NULL; 54 } 55 } 56 57 static int 58 proc_dodebug(ctl_table *table, int write, struct file *file, 59 void __user *buffer, size_t *lenp, loff_t *ppos) 60 { 61 char tmpbuf[20], c, *s; 62 char __user *p; 63 unsigned int value; 64 size_t left, len; 65 66 if ((*ppos && !write) || !*lenp) { 67 *lenp = 0; 68 return 0; 69 } 70 71 left = *lenp; 72 73 if (write) { 74 if (!access_ok(VERIFY_READ, buffer, left)) 75 return -EFAULT; 76 p = buffer; 77 while (left && __get_user(c, p) >= 0 && isspace(c)) 78 left--, p++; 79 if (!left) 80 goto done; 81 82 if (left > sizeof(tmpbuf) - 1) 83 return -EINVAL; 84 if (copy_from_user(tmpbuf, p, left)) 85 return -EFAULT; 86 tmpbuf[left] = '\0'; 87 88 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--) 89 value = 10 * value + (*s - '0'); 90 if (*s && !isspace(*s)) 91 return -EINVAL; 92 while (left && isspace(*s)) 93 left--, s++; 94 *(unsigned int *) table->data = value; 95 /* Display the RPC tasks on writing to rpc_debug */ 96 if (table->ctl_name == CTL_RPCDEBUG) { 97 rpc_show_tasks(); 98 } 99 } else { 100 if (!access_ok(VERIFY_WRITE, buffer, left)) 101 return -EFAULT; 102 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data); 103 if (len > left) 104 len = left; 105 if (__copy_to_user(buffer, tmpbuf, len)) 106 return -EFAULT; 107 if ((left -= len) > 0) { 108 if (put_user('\n', (char __user *)buffer + len)) 109 return -EFAULT; 110 left--; 111 } 112 } 113 114 done: 115 *lenp -= left; 116 *ppos += *lenp; 117 return 0; 118 } 119 120 121 static ctl_table debug_table[] = { 122 { 123 .ctl_name = CTL_RPCDEBUG, 124 .procname = "rpc_debug", 125 .data = &rpc_debug, 126 .maxlen = sizeof(int), 127 .mode = 0644, 128 .proc_handler = &proc_dodebug 129 }, 130 { 131 .ctl_name = CTL_NFSDEBUG, 132 .procname = "nfs_debug", 133 .data = &nfs_debug, 134 .maxlen = sizeof(int), 135 .mode = 0644, 136 .proc_handler = &proc_dodebug 137 }, 138 { 139 .ctl_name = CTL_NFSDDEBUG, 140 .procname = "nfsd_debug", 141 .data = &nfsd_debug, 142 .maxlen = sizeof(int), 143 .mode = 0644, 144 .proc_handler = &proc_dodebug 145 }, 146 { 147 .ctl_name = CTL_NLMDEBUG, 148 .procname = "nlm_debug", 149 .data = &nlm_debug, 150 .maxlen = sizeof(int), 151 .mode = 0644, 152 .proc_handler = &proc_dodebug 153 }, 154 { .ctl_name = 0 } 155 }; 156 157 static ctl_table sunrpc_table[] = { 158 { 159 .ctl_name = CTL_SUNRPC, 160 .procname = "sunrpc", 161 .mode = 0555, 162 .child = debug_table 163 }, 164 { .ctl_name = 0 } 165 }; 166 167 #endif 168