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 *buffer, size_t *lenp)
  62 {
  63         char            tmpbuf[20], *p, c;
  64         unsigned int    value;
  65         size_t          left, len;
  66
  67         if ((file->f_pos && !write) || !*lenp) {
  68                 *lenp = 0;
  69                 return 0;
  70         }
  71
  72         left = *lenp;
  73
  74         if (write) {
  75                 if (!access_ok(VERIFY_READ, buffer, left))
  76                         return -EFAULT;
  77                 p = (char *) buffer;
  78                 while (left && __get_user(c, p) >= 0 && isspace(c))
  79                         left--, p++;
  80                 if (!left)
  81                         goto done;
  82
  83                 if (left > sizeof(tmpbuf) - 1)
  84                         return -EINVAL;
  85                 if (copy_from_user(tmpbuf, p, left))
  86                         return -EFAULT;
  87                 tmpbuf[left] = '\0';
  88
  89                 for (p = tmpbuf, value = 0; '0' <= *p && *p <= '9'; p++, left--)
  90                         value = 10 * value + (*p - '0');
  91                 if (*p && !isspace(*p))
  92                         return -EINVAL;
  93                 while (left && isspace(*p))
  94                         left--, p++;
  95                 *(unsigned int *) table->data = value;
  96                 /* Display the RPC tasks on writing to rpc_debug */
  97                 if (table->ctl_name == CTL_RPCDEBUG) {
  98                         rpc_show_tasks();
  99                 }
 100         } else {
 101                 if (!access_ok(VERIFY_WRITE, buffer, left))
 102                         return -EFAULT;
 103                 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
 104                 if (len > left)
 105                         len = left;
 106                 if (__copy_to_user(buffer, tmpbuf, len))
 107                         return -EFAULT;
 108                 if ((left -= len) > 0) {
 109                         if (put_user('\n', (char *)buffer + len))
 110                                 return -EFAULT;
 111                         left--;
 112                 }
 113         }
 114
 115 done:
 116         *lenp -= left;
 117         file->f_pos += *lenp;
 118         return 0;
 119 }
 120
 121 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
 122 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
 123
 124 static ctl_table debug_table[] = {
 125         {
 126                 .ctl_name       = CTL_RPCDEBUG,
 127                 .procname       = "rpc_debug",
 128                 .data           = &rpc_debug,
 129                 .maxlen         = sizeof(int),
 130                 .mode           = 0644,
 131                 .proc_handler   = &proc_dodebug
 132         },
 133         {
 134                 .ctl_name       = CTL_NFSDEBUG,
 135                 .procname       = "nfs_debug",
 136                 .data           = &nfs_debug,
 137                 .maxlen         = sizeof(int),
 138                 .mode           = 0644,
 139                 .proc_handler   = &proc_dodebug
 140         },
 141         {
 142                 .ctl_name       = CTL_NFSDDEBUG,
 143                 .procname       = "nfsd_debug",
 144                 .data           = &nfsd_debug,
 145                 .maxlen         = sizeof(int),
 146                 .mode           = 0644,
 147                 .proc_handler   = &proc_dodebug
 148         },
 149         {
 150                 .ctl_name       = CTL_NLMDEBUG,
 151                 .procname       = "nlm_debug",
 152                 .data           = &nlm_debug,
 153                 .maxlen         = sizeof(int),
 154                 .mode           = 0644,
 155                 .proc_handler   = &proc_dodebug
 156         },
 157         {
 158                 .ctl_name       = CTL_SLOTTABLE_UDP,
 159                 .procname       = "udp_slot_table_entries",
 160                 .data           = &xprt_udp_slot_table_entries,
 161                 .maxlen         = sizeof(unsigned int),
 162                 .mode           = 0644,
 163                 .proc_handler   = &proc_dointvec_minmax,
 164                 .strategy       = &sysctl_intvec,
 165                 .extra1         = &min_slot_table_size,
 166                 .extra2         = &max_slot_table_size
 167         },
 168         {
 169                 .ctl_name       = CTL_SLOTTABLE_TCP,
 170                 .procname       = "tcp_slot_table_entries",
 171                 .data           = &xprt_tcp_slot_table_entries,
 172                 .maxlen         = sizeof(unsigned int),
 173                 .mode           = 0644,
 174                 .proc_handler   = &proc_dointvec_minmax,
 175                 .strategy       = &sysctl_intvec,
 176                 .extra1         = &min_slot_table_size,
 177                 .extra2         = &max_slot_table_size
 178         },
 179         { .ctl_name = 0 }
 180 };
 181
 182 static ctl_table sunrpc_table[] = {
 183         {
 184                 .ctl_name       = CTL_SUNRPC,
 185                 .procname       = "sunrpc",
 186                 .mode           = 0555,
 187                 .child          = debug_table
 188         },
 189         { .ctl_name = 0 }
 190 };
 191
 192 #endif