carp_debugfs.c

/*
 * carp_debugfs.c -- debugfs interface to carp module
 *
 * Copyright (c) 2012 Damien Churchill <damoxc@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/netdevice.h>

#include "carp.h"

#include <linux/debugfs.h>
#include <linux/seq_file.h>

static struct dentry *carp_debug_root;

void carp_debug_register(struct carp *carp)
{
    if (!carp_debug_root)
        return;

    carp->debug_dir =
        debugfs_create_dir(carp->dev->name, carp_debug_root);

    if (!carp->debug_dir) {
        pr_warning("%s: Warning: failed to register to debugfs\n",
            carp->dev->name);
        return;
    }

    //debugfs_create_file("carp_table", 0400, carp->debug_dir,
    //                    carp, &
}

void carp_debug_unregister(struct carp *carp)
{
    if (!carp_debug_root)
        return;

    debugfs_remove_recursive(carp->debug_dir);
}

void carp_debug_reregister(struct carp *carp)
{
    struct dentry *d;

    if (!carp_debug_root)
        return;

    d = debugfs_rename(carp_debug_root, carp->debug_dir, carp_debug_root,
                       carp->dev->name);
    if (d) {
        carp->debug_dir = d;
    } else {
        pr_warning("%s: Warning: failed to reregister, "
                   "so just unregister old one\n", carp->dev->name);
        carp_debug_unregister(carp);
    }
}

void carp_create_debugfs(void)
{
    carp_debug_root = debugfs_create_dir("carp", NULL);

    if (!carp_debug_root) {
        pr_warning("Warning: Cannot create carp directory"
                   " in debugfs\n");
    }
}

void carp_destroy_debugfs(void)
{
    debugfs_remove_recursive(carp_debug_root);
    carp_debug_root = NULL;
}