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,
  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,
  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         { }
 172 };
 173
 174 static ctl_table sunrpc_table[] = {
 175         {
 176                 .procname       = "sunrpc",
 177                 .mode           = 0555,
 178                 .child          = debug_table
 179         },
 180         { }
 181 };
 182
 183 #endif