1/* 2 * linux/net/sunrpc/sysctl.c 3 * 4 * Sysctl interface to sunrpc module. This is for debugging only now. 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/config.h> 11#include <linux/version.h> 12#include <linux/types.h> 13#include <linux/linkage.h> 14#include <linux/ctype.h> 15#include <linux/fs.h> 16#include <linux/sysctl.h> 17#define __NO_VERSION__ 18#include <linux/module.h> 19 20#include <asm/uaccess.h> 21#include <linux/sunrpc/types.h> 22#include <linux/sunrpc/sched.h> 23#include <linux/sunrpc/stats.h> 24 25/* 26 * Declare the debug flags here 27 */ 28unsigned int rpc_debug; 29unsigned int nfs_debug; 30unsigned int nfsd_debug; 31unsigned int nlm_debug; 32 33#ifdef RPC_DEBUG 34 35static struct ctl_table_header *sunrpc_table_header; 36static ctl_table sunrpc_table[]; 37 38void 39rpc_register_sysctl(void) 40{ 41 if (!sunrpc_table_header) { 42 sunrpc_table_header = register_sysctl_table(sunrpc_table, 1); 43#ifdef CONFIG_PROC_FS 44 if (sunrpc_table[0].de) 45 sunrpc_table[0].de->owner = THIS_MODULE; 46#endif 47 } 48 49} 50 51void 52rpc_unregister_sysctl(void) 53{ 54 if (sunrpc_table_header) { 55 unregister_sysctl_table(sunrpc_table_header); 56 sunrpc_table_header = NULL; 57 } 58} 59 60static int 61proc_dodebug(ctl_table *table, int write, struct file *file, 62 void *buffer, size_t *lenp) 63{ 64 char tmpbuf[20], *p, c; 65 unsigned int value; 66 size_t left, len; 67 68 if ((file->f_pos && !write) || !*lenp) { 69 *lenp = 0; 70 return 0; 71 } 72 73 left = *lenp; 74 75 if (write) { 76 if (!access_ok(VERIFY_READ, buffer, left)) 77 return -EFAULT; 78 p = (char *) buffer; 79 while (left && __get_user(c, p) >= 0 && isspace(c)) 80 left--, p++; 81 if (!left) 82 goto done; 83 84 if (left > sizeof(tmpbuf) - 1) 85 return -EINVAL; 86 copy_from_user(tmpbuf, p, left); 87 tmpbuf[left] = '\0'; 88 89 for (p = tmpbuf, value = 0; '0' <= *p && *p <= '9'; p++, left--) 90 value = 10 * value + (*p - '0'); 91 if (*p && !isspace(*p)) 92 return -EINVAL; 93 while (left && isspace(*p)) 94 left--, p++; 95 *(unsigned int *) table->data = value; 96 /* Display the RPC tasks on writing to rpc_debug */ 97 if (table->ctl_name == CTL_RPCDEBUG) { 98 rpc_show_tasks(); 99 } 100 } else { 101 if (!access_ok(VERIFY_WRITE, buffer, left)) 102 return -EFAULT; 103 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data); 104 if (len > left) 105 len = left; 106 copy_to_user(buffer, tmpbuf, len); 107 if ((left -= len) > 0) { 108 put_user('\n', (char *)buffer + len); 109 left--; 110 } 111 } 112 113done: 114 *lenp -= left; 115 file->f_pos += *lenp; 116 return 0; 117} 118 119#define DIRENTRY(nam1, nam2, child) \ 120 {CTL_##nam1, #nam2, NULL, 0, 0555, child } 121#define DBGENTRY(nam1, nam2) \ 122 {CTL_##nam1##DEBUG, #nam2 "_debug", &nam2##_debug, sizeof(int),\ 123 0644, NULL, &proc_dodebug} 124 125static ctl_table debug_table[] = { 126 DBGENTRY(RPC, rpc), 127 DBGENTRY(NFS, nfs), 128 DBGENTRY(NFSD, nfsd), 129 DBGENTRY(NLM, nlm), 130 {0} 131}; 132 133static ctl_table sunrpc_table[] = { 134 DIRENTRY(SUNRPC, sunrpc, debug_table), 135 {0} 136}; 137 138#endif 139