net/sunrpc/sysctl.c

   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