include/net/9p/transport.h

   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_TRANS_PREF_PAYLOAD_MASK 0x1
  30
  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
  35
  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)
  47  *
  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.
  51  *
  52  * The transport module list is protected by v9fs_trans_lock.
  53  */
  54
  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);
  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(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 */