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[linux-2.6/next.git] / include / net / 9p / transport.h
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1 /*
2 * include/net/9p/transport.h
4 * Transport Definition
6 * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
7 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
26 #ifndef NET_9P_TRANSPORT_H
27 #define NET_9P_TRANSPORT_H
29 #define P9_TRANS_PREF_PAYLOAD_MASK 0x1
31 /* Default. Add Payload to PDU before sending it down to transport layer */
32 #define P9_TRANS_PREF_PAYLOAD_DEF 0x0
33 /* Send pay load separately to transport layer along with PDU.*/
34 #define P9_TRANS_PREF_PAYLOAD_SEP 0x1
36 /**
37 * struct p9_trans_module - transport module interface
38 * @list: used to maintain a list of currently available transports
39 * @name: the human-readable name of the transport
40 * @maxsize: transport provided maximum packet size
41 * @pref: Preferences of this transport
42 * @def: set if this transport should be considered the default
43 * @create: member function to create a new connection on this transport
44 * @close: member function to discard a connection on this transport
45 * @request: member function to issue a request to the transport
46 * @cancel: member function to cancel a request (if it hasn't been sent)
48 * This is the basic API for a transport module which is registered by the
49 * transport module with the 9P core network module and used by the client
50 * to instantiate a new connection on a transport.
52 * The transport module list is protected by v9fs_trans_lock.
55 struct p9_trans_module {
56 struct list_head list;
57 char *name; /* name of transport */
58 int maxsize; /* max message size of transport */
59 int pref; /* Preferences of this transport */
60 int def; /* this transport should be default */
61 struct module *owner;
62 int (*create)(struct p9_client *, const char *, char *);
63 void (*close) (struct p9_client *);
64 int (*request) (struct p9_client *, struct p9_req_t *req);
65 int (*cancel) (struct p9_client *, struct p9_req_t *req);
68 void v9fs_register_trans(struct p9_trans_module *m);
69 void v9fs_unregister_trans(struct p9_trans_module *m);
70 struct p9_trans_module *v9fs_get_trans_by_name(const substring_t *name);
71 struct p9_trans_module *v9fs_get_default_trans(void);
72 void v9fs_put_trans(struct p9_trans_module *m);
73 #endif /* NET_9P_TRANSPORT_H */