mod.c revision 8a0dc95fd976a052e5e799ef33e6c8e3141b5dff 
1/*
2 *  net/9p/9p.c
3 *
4 *  9P entry point
5 *
6 *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
7 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 *
10 *  This program is free software; you can redistribute it and/or modify
11 *  it under the terms of the GNU General Public License version 2
12 *  as published by the Free Software Foundation.
13 *
14 *  This program is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this program; if not, write to:
21 *  Free Software Foundation
22 *  51 Franklin Street, Fifth Floor
23 *  Boston, MA  02111-1301  USA
24 *
25 */
26
27#include <linux/module.h>
28#include <linux/moduleparam.h>
29#include <net/9p/9p.h>
30#include <linux/fs.h>
31#include <linux/parser.h>
32#include <net/9p/transport.h>
33#include <linux/list.h>
34
35#ifdef CONFIG_NET_9P_DEBUG
36unsigned int p9_debug_level = 0;	/* feature-rific global debug level  */
37EXPORT_SYMBOL(p9_debug_level);
38module_param_named(debug, p9_debug_level, uint, 0);
39MODULE_PARM_DESC(debug, "9P debugging level");
40#endif
41
42extern int p9_mux_global_init(void);
43extern void p9_mux_global_exit(void);
44
45/*
46 * Dynamic Transport Registration Routines
47 *
48 */
49
50static LIST_HEAD(v9fs_trans_list);
51static struct p9_trans_module *v9fs_default_transport;
52
53/**
54 * v9fs_register_trans - register a new transport with 9p
55 * @m - structure describing the transport module and entry points
56 *
57 */
58void v9fs_register_trans(struct p9_trans_module *m)
59{
60	list_add_tail(&m->list, &v9fs_trans_list);
61	if (m->def)
62		v9fs_default_transport = m;
63}
64EXPORT_SYMBOL(v9fs_register_trans);
65
66/**
67 * v9fs_match_trans - match transport versus registered transports
68 * @arg: string identifying transport
69 *
70 */
71struct p9_trans_module *v9fs_match_trans(const substring_t *name)
72{
73	struct list_head *p;
74	struct p9_trans_module *t = NULL;
75
76	list_for_each(p, &v9fs_trans_list) {
77		t = list_entry(p, struct p9_trans_module, list);
78		if (strncmp(t->name, name->from, name->to-name->from) == 0)
79			return t;
80	}
81	return NULL;
82}
83EXPORT_SYMBOL(v9fs_match_trans);
84
85/**
86 * v9fs_default_trans - returns pointer to default transport
87 *
88 */
89
90struct p9_trans_module *v9fs_default_trans(void)
91{
92	if (v9fs_default_transport)
93		return v9fs_default_transport;
94	else if (!list_empty(&v9fs_trans_list))
95		return list_first_entry(&v9fs_trans_list,
96					struct p9_trans_module, list);
97	else
98		return NULL;
99}
100EXPORT_SYMBOL(v9fs_default_trans);
101
102
103/**
104 * v9fs_init - Initialize module
105 *
106 */
107static int __init init_p9(void)
108{
109	int ret = 0;
110
111	p9_error_init();
112	printk(KERN_INFO "Installing 9P2000 support\n");
113
114	return ret;
115}
116
117/**
118 * v9fs_init - shutdown module
119 *
120 */
121
122static void __exit exit_p9(void)
123{
124	printk(KERN_INFO "Unloading 9P2000 support\n");
125}
126
127module_init(init_p9)
128module_exit(exit_p9)
129
130MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
131MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
132MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
133MODULE_LICENSE("GPL");
134