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/config.h>
  11 #include <linux/types.h>
  12 #include <linux/linkage.h>
  13 #include <linux/ctype.h>
  14 #include <linux/fs.h>
  15 #include <linux/sysctl.h>
  16 #include <linux/module.h>
  17
  18 #include <asm/uaccess.h>
  19 #include <linux/sunrpc/types.h>
  20 #include <linux/sunrpc/sched.h>
  21 #include <linux/sunrpc/stats.h>
  22 #include <linux/sunrpc/xprt.h>
  23
  24 /*
  25  * Declare the debug flags here
  26  */
  27 unsigned int    rpc_debug;
  28 unsigned int    nfs_debug;
  29 unsigned int    nfsd_debug;
  30 unsigned int    nlm_debug;
  31
  32 #ifdef RPC_DEBUG
  33
  34 static struct ctl_table_header *sunrpc_table_header;
  35 static ctl_table                sunrpc_table[];
  36
  37 void
  38 rpc_register_sysctl(void)
  39 {
  40         if (!sunrpc_table_header) {
  41                 sunrpc_table_header = register_sysctl_table(sunrpc_table, 1);
  42 #ifdef CONFIG_PROC_FS
  43                 if (sunrpc_table[0].de)
  44                         sunrpc_table[0].de->owner = THIS_MODULE;
  45 #endif
  46         }
  47
  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
  60 proc_dodebug(ctl_table *table, int write, struct file *file,
  61                                 void __user *buffer, size_t *lenp, loff_t *ppos)
  62 {
  63         char            tmpbuf[20], c, *s;
  64         char __user *p;
  65         unsigned int    value;
  66         size_t          left, len;
  67
  68         if ((*ppos && !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 = 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                 if (copy_from_user(tmpbuf, p, left))
  87                         return -EFAULT;
  88                 tmpbuf[left] = '\0';
  89
  90                 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
  91                         value = 10 * value + (*s - '0');
  92                 if (*s && !isspace(*s))
  93                         return -EINVAL;
  94                 while (left && isspace(*s))
  95                         left--, s++;
  96                 *(unsigned int *) table->data = value;
  97                 /* Display the RPC tasks on writing to rpc_debug */
  98                 if (table->ctl_name == CTL_RPCDEBUG) {
  99                         rpc_show_tasks();
 100                 }
 101         } else {
 102                 if (!access_ok(VERIFY_WRITE, buffer, left))
 103                         return -EFAULT;
 104                 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
 105                 if (len > left)
 106                         len = left;
 107                 if (__copy_to_user(buffer, tmpbuf, len))
 108                         return -EFAULT;
 109                 if ((left -= len) > 0) {
 110                         if (put_user('\n', (char __user *)buffer + len))
 111                                 return -EFAULT;
 112                         left--;
 113                 }
 114         }
 115
 116 done:
 117         *lenp -= left;
 118         *ppos += *lenp;
 119         return 0;
 120 }
 121
 122 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
 123 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
 124
 125 static ctl_table debug_table[] = {
 126         {
 127                 .ctl_name       = CTL_RPCDEBUG,
 128                 .procname       = "rpc_debug",
 129                 .data           = &rpc_debug,
 130                 .maxlen         = sizeof(int),
 131                 .mode           = 0644,
 132                 .proc_handler   = &proc_dodebug
 133         },
 134         {
 135                 .ctl_name       = CTL_NFSDEBUG,
 136                 .procname       = "nfs_debug",
 137                 .data           = &nfs_debug,
 138                 .maxlen         = sizeof(int),
 139                 .mode           = 0644,
 140                 .proc_handler   = &proc_dodebug
 141         },
 142         {
 143                 .ctl_name       = CTL_NFSDDEBUG,
 144                 .procname       = "nfsd_debug",
 145                 .data           = &nfsd_debug,
 146                 .maxlen         = sizeof(int),
 147                 .mode           = 0644,
 148                 .proc_handler   = &proc_dodebug
 149         },
 150         {
 151                 .ctl_name       = CTL_NLMDEBUG,
 152                 .procname       = "nlm_debug",
 153                 .data           = &nlm_debug,
 154                 .maxlen         = sizeof(int),
 155                 .mode           = 0644,
 156                 .proc_handler   = &proc_dodebug
 157         },
 158         {
 159                 .ctl_name       = CTL_SLOTTABLE_UDP,
 160                 .procname       = "udp_slot_table_entries",
 161                 .data           = &xprt_udp_slot_table_entries,
 162                 .maxlen         = sizeof(unsigned int),
 163                 .mode           = 0644,
 164                 .proc_handler   = &proc_dointvec_minmax,
 165                 .strategy       = &sysctl_intvec,
 166                 .extra1         = &min_slot_table_size,
 167                 .extra2         = &max_slot_table_size
 168         },
 169         {
 170                 .ctl_name       = CTL_SLOTTABLE_TCP,
 171                 .procname       = "tcp_slot_table_entries",
 172                 .data           = &xprt_tcp_slot_table_entries,
 173                 .maxlen         = sizeof(unsigned int),
 174                 .mode           = 0644,
 175                 .proc_handler   = &proc_dointvec_minmax,
 176                 .strategy       = &sysctl_intvec,
 177                 .extra1         = &min_slot_table_size,
 178                 .extra2         = &max_slot_table_size
 179         },
 180         { .ctl_name = 0 }
 181 };
 182
 183 static ctl_table sunrpc_table[] = {
 184         {
 185                 .ctl_name       = CTL_SUNRPC,
 186                 .procname       = "sunrpc",
 187                 .mode           = 0555,
 188                 .child          = debug_table
 189         },
 190         { .ctl_name = 0 }
 191 };
 192
 193 #endif