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TOMOYO Linux Cross Reference
Linux/net/9p/mod.c

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  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/client.h>
 33 #include <net/9p/transport.h>
 34 #include <linux/list.h>
 35 #include <linux/spinlock.h>
 36 
 37 #ifdef CONFIG_NET_9P_DEBUG
 38 unsigned int p9_debug_level = 0;        /* feature-rific global debug level  */
 39 EXPORT_SYMBOL(p9_debug_level);
 40 module_param_named(debug, p9_debug_level, uint, 0);
 41 MODULE_PARM_DESC(debug, "9P debugging level");
 42 #endif
 43 
 44 /*
 45  * Dynamic Transport Registration Routines
 46  *
 47  */
 48 
 49 static DEFINE_SPINLOCK(v9fs_trans_lock);
 50 static LIST_HEAD(v9fs_trans_list);
 51 
 52 /**
 53  * v9fs_register_trans - register a new transport with 9p
 54  * @m: structure describing the transport module and entry points
 55  *
 56  */
 57 void v9fs_register_trans(struct p9_trans_module *m)
 58 {
 59         spin_lock(&v9fs_trans_lock);
 60         list_add_tail(&m->list, &v9fs_trans_list);
 61         spin_unlock(&v9fs_trans_lock);
 62 }
 63 EXPORT_SYMBOL(v9fs_register_trans);
 64 
 65 /**
 66  * v9fs_unregister_trans - unregister a 9p transport
 67  * @m: the transport to remove
 68  *
 69  */
 70 void v9fs_unregister_trans(struct p9_trans_module *m)
 71 {
 72         spin_lock(&v9fs_trans_lock);
 73         list_del_init(&m->list);
 74         spin_unlock(&v9fs_trans_lock);
 75 }
 76 EXPORT_SYMBOL(v9fs_unregister_trans);
 77 
 78 /**
 79  * v9fs_get_trans_by_name - get transport with the matching name
 80  * @name: string identifying transport
 81  *
 82  */
 83 struct p9_trans_module *v9fs_get_trans_by_name(const substring_t *name)
 84 {
 85         struct p9_trans_module *t, *found = NULL;
 86 
 87         spin_lock(&v9fs_trans_lock);
 88 
 89         list_for_each_entry(t, &v9fs_trans_list, list)
 90                 if (strncmp(t->name, name->from, name->to-name->from) == 0 &&
 91                     try_module_get(t->owner)) {
 92                         found = t;
 93                         break;
 94                 }
 95 
 96         spin_unlock(&v9fs_trans_lock);
 97         return found;
 98 }
 99 EXPORT_SYMBOL(v9fs_get_trans_by_name);
100 
101 /**
102  * v9fs_get_default_trans - get the default transport
103  *
104  */
105 
106 struct p9_trans_module *v9fs_get_default_trans(void)
107 {
108         struct p9_trans_module *t, *found = NULL;
109 
110         spin_lock(&v9fs_trans_lock);
111 
112         list_for_each_entry(t, &v9fs_trans_list, list)
113                 if (t->def && try_module_get(t->owner)) {
114                         found = t;
115                         break;
116                 }
117 
118         if (!found)
119                 list_for_each_entry(t, &v9fs_trans_list, list)
120                         if (try_module_get(t->owner)) {
121                                 found = t;
122                                 break;
123                         }
124 
125         spin_unlock(&v9fs_trans_lock);
126         return found;
127 }
128 EXPORT_SYMBOL(v9fs_get_default_trans);
129 
130 /**
131  * v9fs_put_trans - put trans
132  * @m: transport to put
133  *
134  */
135 void v9fs_put_trans(struct p9_trans_module *m)
136 {
137         if (m)
138                 module_put(m->owner);
139 }
140 
141 /**
142  * init_p9 - Initialize module
143  *
144  */
145 static int __init init_p9(void)
146 {
147         int ret = 0;
148 
149         p9_error_init();
150         printk(KERN_INFO "Installing 9P2000 support\n");
151         p9_trans_fd_init();
152 
153         return ret;
154 }
155 
156 /**
157  * exit_p9 - shutdown module
158  *
159  */
160 
161 static void __exit exit_p9(void)
162 {
163         printk(KERN_INFO "Unloading 9P2000 support\n");
164 
165         p9_trans_fd_exit();
166 }
167 
168 module_init(init_p9)
169 module_exit(exit_p9)
170 
171 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
172 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
173 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
174 MODULE_LICENSE("GPL");
175 

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