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Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001/*
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>
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050030#include <linux/fs.h>
31#include <linux/parser.h>
32#include <net/9p/transport.h>
33#include <linux/list.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050034
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);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050044
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050045/*
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)
Latchesar Ionkovdd1a4582007-11-06 08:02:53 -060079 return t;
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050080 }
Latchesar Ionkovdd1a4582007-11-06 08:02:53 -060081 return NULL;
Eric Van Hensbergenfb0466c2007-10-17 14:31:07 -050082}
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
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500103/**
104 * v9fs_init - Initialize module
105 *
106 */
107static int __init init_p9(void)
108{
109 int ret;
110
111 p9_error_init();
112 printk(KERN_INFO "Installing 9P2000 support\n");
113 ret = p9_mux_global_init();
114 if (ret) {
115 printk(KERN_WARNING "9p: starting mux failed\n");
116 return ret;
117 }
118
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500119 return ret;
120}
121
122/**
123 * v9fs_init - shutdown module
124 *
125 */
126
127static void __exit exit_p9(void)
128{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500129 p9_mux_global_exit();
130}
131
132module_init(init_p9)
133module_exit(exit_p9)
134
135MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
136MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
137MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
138MODULE_LICENSE("GPL");