linux/net/sunrpc/sysctl.c
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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#include <linux/sunrpc/svc_xprt.h>
  22
  23#include "netns.h"
  24
  25/*
  26 * Declare the debug flags here
  27 */
  28unsigned int    rpc_debug;
  29EXPORT_SYMBOL_GPL(rpc_debug);
  30
  31unsigned int    nfs_debug;
  32EXPORT_SYMBOL_GPL(nfs_debug);
  33
  34unsigned int    nfsd_debug;
  35EXPORT_SYMBOL_GPL(nfsd_debug);
  36
  37unsigned int    nlm_debug;
  38EXPORT_SYMBOL_GPL(nlm_debug);
  39
  40#ifdef RPC_DEBUG
  41
  42static struct ctl_table_header *sunrpc_table_header;
  43static ctl_table                sunrpc_table[];
  44
  45void
  46rpc_register_sysctl(void)
  47{
  48        if (!sunrpc_table_header)
  49                sunrpc_table_header = register_sysctl_table(sunrpc_table);
  50}
  51
  52void
  53rpc_unregister_sysctl(void)
  54{
  55        if (sunrpc_table_header) {
  56                unregister_sysctl_table(sunrpc_table_header);
  57                sunrpc_table_header = NULL;
  58        }
  59}
  60
  61static int proc_do_xprt(ctl_table *table, int write,
  62                        void __user *buffer, size_t *lenp, loff_t *ppos)
  63{
  64        char tmpbuf[256];
  65        size_t len;
  66
  67        if ((*ppos && !write) || !*lenp) {
  68                *lenp = 0;
  69                return 0;
  70        }
  71        len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
  72        return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len);
  73}
  74
  75static int
  76proc_dodebug(ctl_table *table, int write,
  77                                void __user *buffer, size_t *lenp, loff_t *ppos)
  78{
  79        char            tmpbuf[20], c, *s;
  80        char __user *p;
  81        unsigned int    value;
  82        size_t          left, len;
  83
  84        if ((*ppos && !write) || !*lenp) {
  85                *lenp = 0;
  86                return 0;
  87        }
  88
  89        left = *lenp;
  90
  91        if (write) {
  92                if (!access_ok(VERIFY_READ, buffer, left))
  93                        return -EFAULT;
  94                p = buffer;
  95                while (left && __get_user(c, p) >= 0 && isspace(c))
  96                        left--, p++;
  97                if (!left)
  98                        goto done;
  99
 100                if (left > sizeof(tmpbuf) - 1)
 101                        return -EINVAL;
 102                if (copy_from_user(tmpbuf, p, left))
 103                        return -EFAULT;
 104                tmpbuf[left] = '\0';
 105
 106                for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
 107                        value = 10 * value + (*s - '0');
 108                if (*s && !isspace(*s))
 109                        return -EINVAL;
 110                while (left && isspace(*s))
 111                        left--, s++;
 112                *(unsigned int *) table->data = value;
 113                /* Display the RPC tasks on writing to rpc_debug */
 114                if (strcmp(table->procname, "rpc_debug") == 0)
 115                        rpc_show_tasks(&init_net);
 116        } else {
 117                if (!access_ok(VERIFY_WRITE, buffer, left))
 118                        return -EFAULT;
 119                len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
 120                if (len > left)
 121                        len = left;
 122                if (__copy_to_user(buffer, tmpbuf, len))
 123                        return -EFAULT;
 124                if ((left -= len) > 0) {
 125                        if (put_user('\n', (char __user *)buffer + len))
 126                                return -EFAULT;
 127                        left--;
 128                }
 129        }
 130
 131done:
 132        *lenp -= left;
 133        *ppos += *lenp;
 134        return 0;
 135}
 136
 137
 138static ctl_table debug_table[] = {
 139        {
 140                .procname       = "rpc_debug",
 141                .data           = &rpc_debug,
 142                .maxlen         = sizeof(int),
 143                .mode           = 0644,
 144                .proc_handler   = proc_dodebug
 145        },
 146        {
 147                .procname       = "nfs_debug",
 148                .data           = &nfs_debug,
 149                .maxlen         = sizeof(int),
 150                .mode           = 0644,
 151                .proc_handler   = proc_dodebug
 152        },
 153        {
 154                .procname       = "nfsd_debug",
 155                .data           = &nfsd_debug,
 156                .maxlen         = sizeof(int),
 157                .mode           = 0644,
 158                .proc_handler   = proc_dodebug
 159        },
 160        {
 161                .procname       = "nlm_debug",
 162                .data           = &nlm_debug,
 163                .maxlen         = sizeof(int),
 164                .mode           = 0644,
 165                .proc_handler   = proc_dodebug
 166        },
 167        {
 168                .procname       = "transports",
 169                .maxlen         = 256,
 170                .mode           = 0444,
 171                .proc_handler   = proc_do_xprt,
 172        },
 173        { }
 174};
 175
 176static ctl_table sunrpc_table[] = {
 177        {
 178                .procname       = "sunrpc",
 179                .mode           = 0555,
 180                .child          = debug_table
 181        },
 182        { }
 183};
 184
 185#endif
 186
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