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/*

 * linux/net/sunrpc/sysctl.c

 *

 * Sysctl interface to sunrpc module. This is for debugging only now.

 *

 * I would prefer to register the sunrpc table below sys/net, but that's

 * impossible at the moment.

 */

#include <linux/config.h>

#include <linux/version.h>

#include <linux/types.h>

#include <linux/linkage.h>

#include <linux/ctype.h>

#include <linux/fs.h>

#include <linux/sysctl.h>

#include <linux/module.h>

#include <asm/uaccess.h>

#include <linux/sunrpc/types.h>

#include <linux/sunrpc/sched.h>

#include <linux/sunrpc/stats.h>

/*

 * Declare the debug flags here

 */

unsigned int    rpc_debug;

unsigned int    nfs_debug;

unsigned int    nfsd_debug;

unsigned int    nlm_debug;

#ifdef RPC_DEBUG

static struct ctl_table_header *sunrpc_table_header;

static ctl_table                sunrpc_table[];

void

rpc_register_sysctl(void)

{

        if (!sunrpc_table_header) {

                sunrpc_table_header = register_sysctl_table(sunrpc_table, 1);

#ifdef CONFIG_PROC_FS

                if (sunrpc_table[0].de)

                        sunrpc_table[0].de->owner = THIS_MODULE;

#endif

        }

}

void

rpc_unregister_sysctl(void)

{

        if (sunrpc_table_header) {

                unregister_sysctl_table(sunrpc_table_header);

                sunrpc_table_header = NULL;

        }

}

static int

proc_dodebug(ctl_table *table, int write, struct file *file,

                                void *buffer, size_t *lenp)

{

        char            tmpbuf[20], *p, c;

        unsigned int    value;

        size_t          left, len;

        if ((file->f_pos && !write) || !*lenp) {

                *lenp = 0;

                return 0;

        }

        left = *lenp;

        if (write) {

                if (!access_ok(VERIFY_READ, buffer, left))

                        return -EFAULT;

                p = (char *) buffer;

                while (left && __get_user(c, p) >= 0 && isspace(c))

                        left--, p++;

                if (!left)

                        goto done;

                if (left > sizeof(tmpbuf) - 1)

                        return -EINVAL;

                copy_from_user(tmpbuf, p, left);

                tmpbuf[left] = '\0';

                for (p = tmpbuf, value = 0; '0' <= *p && *p <= '9'; p++, left--)

                        value = 10 * value + (*p - '0');

                if (*p && !isspace(*p))

                        return -EINVAL;

                while (left && isspace(*p))

                        left--, p++;

                *(unsigned int *) table->data = value;

                /* Display the RPC tasks on writing to rpc_debug */

                if (table->ctl_name == CTL_RPCDEBUG) {

                        rpc_show_tasks();

                }

        } else {

                if (!access_ok(VERIFY_WRITE, buffer, left))

                        return -EFAULT;

                len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);

                if (len > left)

                        len = left;

                copy_to_user(buffer, tmpbuf, len);

                if ((left -= len) > 0) {

                        put_user('\n', (char *)buffer + len);

                        left--;

                }

        }

done:

        *lenp -= left;

        file->f_pos += *lenp;

        return 0;

}

#define DIRENTRY(nam1, nam2, child)     \

        {CTL_##nam1, #nam2, NULL, 0, 0555, child }

#define DBGENTRY(nam1, nam2)    \

        {CTL_##nam1##DEBUG, #nam2 "_debug", &nam2##_debug, sizeof(int),\

         0644, NULL, &proc_dodebug}

static ctl_table                debug_table[] = {

        DBGENTRY(RPC,  rpc),

        DBGENTRY(NFS,  nfs),

        DBGENTRY(NFSD, nfsd),

        DBGENTRY(NLM,  nlm),

        {0}

};

static ctl_table                sunrpc_table[] = {

        DIRENTRY(SUNRPC, sunrpc, debug_table),

        {0}

};

#endif