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
  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