net/9p/mod.c

   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
  36 unsigned int p9_debug_level = 0;        /* feature-rific global debug level  */
  37 EXPORT_SYMBOL(p9_debug_level);
  38 module_param_named(debug, p9_debug_level, uint, 0);
  39 MODULE_PARM_DESC(debug, "9P debugging level");
  40 #endif
  41
  42 extern int p9_mux_global_init(void);
  43 extern void p9_mux_global_exit(void);
  44
  45 /*
  46  * Dynamic Transport Registration Routines
  47  *
  48  */
  49
  50 static LIST_HEAD(v9fs_trans_list);
  51 static 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  */
  58 void 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 }
  64 EXPORT_SYMBOL(v9fs_register_trans);
  65
  66 /**
  67  * v9fs_match_trans - match transport versus registered transports
  68  * @arg: string identifying transport
  69  *
  70  */
  71 struct 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 }
  83 EXPORT_SYMBOL(v9fs_match_trans);
  84
  85 /**
  86  * v9fs_default_trans - returns pointer to default transport
  87  *
  88  */
  89
  90 struct 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 }
 100 EXPORT_SYMBOL(v9fs_default_trans);
 101
 102
 103 /**
 104  * v9fs_init - Initialize module
 105  *
 106  */
 107 static 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
 119         return ret;
 120 }
 121
 122 /**
 123  * v9fs_init - shutdown module
 124  *
 125  */
 126
 127 static void __exit exit_p9(void)
 128 {
 129         p9_mux_global_exit();
 130 }
 131
 132 module_init(init_p9)
 133 module_exit(exit_p9)
 134
 135 MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
 136 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
 137 MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
 138 MODULE_LICENSE("GPL");