/*
   * include/net/9p/transport.h
   *
   * Transport Definition
   *
   *  Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
   *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License version 2
   *  as published by the Free Software Foundation.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to:
   *  Free Software Foundation
   *  51 Franklin Street, Fifth Floor
   *  Boston, MA  02111-1301  USA
   *
   */
  
  #ifndef NET_9P_TRANSPORT_H
  #define NET_9P_TRANSPORT_H
  
  #define P9_DEF_MIN_RESVPORT	(665U)
  #define P9_DEF_MAX_RESVPORT	(1023U)
  
  /**
   * struct p9_trans_module - transport module interface
   * @list: used to maintain a list of currently available transports
   * @name: the human-readable name of the transport
   * @maxsize: transport provided maximum packet size
   * @def: set if this transport should be considered the default
   * @create: member function to create a new connection on this transport
   * @close: member function to discard a connection on this transport
   * @request: member function to issue a request to the transport
   * @cancel: member function to cancel a request (if it hasn't been sent)
   * @cancelled: member function to notify that a cancelled request will not
   *             not receive a reply
   *
   * This is the basic API for a transport module which is registered by the
   * transport module with the 9P core network module and used by the client
   * to instantiate a new connection on a transport.
   *
   * The transport module list is protected by v9fs_trans_lock.
   */
  
  struct p9_trans_module {
  	struct list_head list;
  	char *name;		/* name of transport */
  	int maxsize;		/* max message size of transport */
  	int def;		/* this transport should be default */
  	struct module *owner;
  	int (*create)(struct p9_client *, const char *, char *);
  	void (*close) (struct p9_client *);
  	int (*request) (struct p9_client *, struct p9_req_t *req);
  	int (*cancel) (struct p9_client *, struct p9_req_t *req);
  	int (*cancelled)(struct p9_client *, struct p9_req_t *req);
  	int (*zc_request)(struct p9_client *, struct p9_req_t *,
  			  struct iov_iter *, struct iov_iter *, int , int, int);
  };
  
  void v9fs_register_trans(struct p9_trans_module *m);
  void v9fs_unregister_trans(struct p9_trans_module *m);
  struct p9_trans_module *v9fs_get_trans_by_name(char *s);
  struct p9_trans_module *v9fs_get_default_trans(void);
  void v9fs_put_trans(struct p9_trans_module *m);
  #endif /* NET_9P_TRANSPORT_H */