Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
42/*
43 * Dynamic Transport Registration Routines
44 *
45 */
46
47static LIST_HEAD(v9fs_trans_list);
48static struct p9_trans_module *v9fs_default_transport;
49
50/**
51 * v9fs_register_trans - register a new transport with 9p
52 * @m: structure describing the transport module and entry points
53 *
54 */
55void v9fs_register_trans(struct p9_trans_module *m)
56{
57 list_add_tail(&m->list, &v9fs_trans_list);
58 if (m->def)
59 v9fs_default_transport = m;
60}
61EXPORT_SYMBOL(v9fs_register_trans);
62
63/**
64 * v9fs_match_trans - match transport versus registered transports
65 * @name: string identifying transport
66 *
67 */
68struct p9_trans_module *v9fs_match_trans(const substring_t *name)
69{
70 struct list_head *p;
71 struct p9_trans_module *t = NULL;
72
73 list_for_each(p, &v9fs_trans_list) {
74 t = list_entry(p, struct p9_trans_module, list);
75 if (strncmp(t->name, name->from, name->to-name->from) == 0)
76 return t;
77 }
78 return NULL;
79}
80EXPORT_SYMBOL(v9fs_match_trans);
81
82/**
83 * v9fs_default_trans - returns pointer to default transport
84 *
85 */
86
87struct p9_trans_module *v9fs_default_trans(void)
88{
89 if (v9fs_default_transport)
90 return v9fs_default_transport;
91 else if (!list_empty(&v9fs_trans_list))
92 return list_first_entry(&v9fs_trans_list,
93 struct p9_trans_module, list);
94 else
95 return NULL;
96}
97EXPORT_SYMBOL(v9fs_default_trans);
98
99
100/**
101 * v9fs_init - Initialize module
102 *
103 */
104static int __init init_p9(void)
105{
106 int ret = 0;
107
108 p9_error_init();
109 printk(KERN_INFO "Installing 9P2000 support\n");
110 p9_trans_fd_init();
111
112 return ret;
113}
114
115/**
116 * v9fs_init - shutdown module
117 *
118 */
119
120static void __exit exit_p9(void)
121{
122 printk(KERN_INFO "Unloading 9P2000 support\n");
123}
124
125module_init(init_p9)
126module_exit(exit_p9)
127
128MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
129MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
130MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
131MODULE_LICENSE("GPL");