mod.c

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/*
 *  net/9p/9p.c
 *
 *  9P entry point
 *
 *  Copyright (C) 2007 by Latchesar Ionkov <[email protected]>
 *  Copyright (C) 2004 by Eric Van Hensbergen <[email protected]>
 *  Copyright (C) 2002 by Ron Minnich <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  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:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/moduleparam.h>
#include <net/9p/9p.h>
#include <linux/fs.h>
#include <linux/parser.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
#include <linux/list.h>
#include <linux/spinlock.h>

#ifdef CONFIG_NET_9P_DEBUG
unsigned int p9_debug_level = 0;    /* feature-rific global debug level  */
EXPORT_SYMBOL(p9_debug_level);
module_param_named(debug, p9_debug_level, uint, 0);
MODULE_PARM_DESC(debug, "9P debugging level");

void _p9_debug(enum p9_debug_flags level, const char *func,
        const char *fmt, ...)
{
    struct va_format vaf;
    va_list args;

    if ((p9_debug_level & level) != level)
        return;

    va_start(args, fmt);

    vaf.fmt = fmt;
    vaf.va = &args;

    if (level == P9_DEBUG_9P)
        pr_notice("(%8.8d) %pV", task_pid_nr(current), &vaf);
    else
        pr_notice("-- %s (%d): %pV", func, task_pid_nr(current), &vaf);

    va_end(args);
}
EXPORT_SYMBOL(_p9_debug);
#endif

/*
 * Dynamic Transport Registration Routines
 *
 */

static DEFINE_SPINLOCK(v9fs_trans_lock);
static LIST_HEAD(v9fs_trans_list);

void v9fs_register_trans(struct p9_trans_module *m)
{
    spin_lock(&v9fs_trans_lock);
    list_add_tail(&m->list, &v9fs_trans_list);
    spin_unlock(&v9fs_trans_lock);
}
EXPORT_SYMBOL(v9fs_register_trans);

void v9fs_unregister_trans(struct p9_trans_module *m)
{
    spin_lock(&v9fs_trans_lock);
    list_del_init(&m->list);
    spin_unlock(&v9fs_trans_lock);
}
EXPORT_SYMBOL(v9fs_unregister_trans);

struct p9_trans_module *v9fs_get_trans_by_name(char *s)
{
    struct p9_trans_module *t, *found = NULL;

    spin_lock(&v9fs_trans_lock);

    list_for_each_entry(t, &v9fs_trans_list, list)
        if (strcmp(t->name, s) == 0 &&
            try_module_get(t->owner)) {
            found = t;
            break;
        }

    spin_unlock(&v9fs_trans_lock);
    return found;
}
EXPORT_SYMBOL(v9fs_get_trans_by_name);

struct p9_trans_module *v9fs_get_default_trans(void)
{
    struct p9_trans_module *t, *found = NULL;

    spin_lock(&v9fs_trans_lock);

    list_for_each_entry(t, &v9fs_trans_list, list)
        if (t->def && try_module_get(t->owner)) {
            found = t;
            break;
        }

    if (!found)
        list_for_each_entry(t, &v9fs_trans_list, list)
            if (try_module_get(t->owner)) {
                found = t;
                break;
            }

    spin_unlock(&v9fs_trans_lock);
    return found;
}
EXPORT_SYMBOL(v9fs_get_default_trans);

void v9fs_put_trans(struct p9_trans_module *m)
{
    if (m)
        module_put(m->owner);
}

static int __init init_p9(void)
{
    int ret = 0;

    p9_error_init();
    pr_info("Installing 9P2000 support\n");
    p9_trans_fd_init();

    return ret;
}

static void __exit exit_p9(void)
{
    pr_info("Unloading 9P2000 support\n");

    p9_trans_fd_exit();
}

module_init(init_p9)
module_exit(exit_p9)

MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
MODULE_AUTHOR("Eric Van Hensbergen <[email protected]>");
MODULE_AUTHOR("Ron Minnich <[email protected]>");
MODULE_LICENSE("GPL");