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