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   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