1 /*
2  * include/net/9p/transport.h
3  *
4  * Transport Definition
5  *
6  *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
7  *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
8  *
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.
12  *
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.
17  *
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
23  *
24  */
25 
26 #ifndef NET_9P_TRANSPORT_H
27 #define NET_9P_TRANSPORT_H
28 
29 #define P9_DEF_MIN_RESVPORT	(665U)
30 #define P9_DEF_MAX_RESVPORT	(1023U)
31 
32 /**
33  * struct p9_trans_module - transport module interface
34  * @list: used to maintain a list of currently available transports
35  * @name: the human-readable name of the transport
36  * @maxsize: transport provided maximum packet size
37  * @def: set if this transport should be considered the default
38  * @create: member function to create a new connection on this transport
39  * @close: member function to discard a connection on this transport
40  * @request: member function to issue a request to the transport
41  * @cancel: member function to cancel a request (if it hasn't been sent)
42  * @cancelled: member function to notify that a cancelled request will not
43  *             not receive a reply
44  *
45  * This is the basic API for a transport module which is registered by the
46  * transport module with the 9P core network module and used by the client
47  * to instantiate a new connection on a transport.
48  *
49  * The transport module list is protected by v9fs_trans_lock.
50  */
51 
52 struct p9_trans_module {
53 	struct list_head list;
54 	char *name;		/* name of transport */
55 	int maxsize;		/* max message size of transport */
56 	int def;		/* this transport should be default */
57 	struct module *owner;
58 	int (*create)(struct p9_client *, const char *, char *);
59 	void (*close) (struct p9_client *);
60 	int (*request) (struct p9_client *, struct p9_req_t *req);
61 	int (*cancel) (struct p9_client *, struct p9_req_t *req);
62 	int (*cancelled)(struct p9_client *, struct p9_req_t *req);
63 	int (*zc_request)(struct p9_client *, struct p9_req_t *,
64 			  struct iov_iter *, struct iov_iter *, int , int, int);
65 	int (*show_options)(struct seq_file *, struct p9_client *);
66 };
67 
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(char *s);
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 */
74