/* 
   *  Transport specific attributes.
   *
   *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  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 the Free Software
   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  #ifndef SCSI_TRANSPORT_H
  #define SCSI_TRANSPORT_H
  
  #include <linux/transport_class.h>

  #include <linux/blkdev.h>

  #include <scsi/scsi_host.h>

  #include <scsi/scsi_device.h>

  
  struct scsi_transport_template {
  	/* the attribute containers */
  	struct transport_container host_attrs;
  	struct transport_container target_attrs;
  	struct transport_container device_attrs;

  	/*

  	 * If set, called from sysfs and legacy procfs rescanning code.

  	 */

  	int (*user_scan)(struct Scsi_Host *, uint, uint, uint);

  	/* The size of the specific transport attribute structure (a
  	 * space of this size will be left at the end of the
  	 * scsi_* structure */
  	int	device_size;

  	int	device_private_offset;

  	int	target_size;

  	int	target_private_offset;

  	int	host_size;

  	/* no private offset for the host; there's an alternative mechanism */

  
  	/*
  	 * True if the transport wants to use a host-based work-queue
  	 */
  	unsigned int create_work_queue : 1;

  
  	/*

  	 * Allows a transport to override the default error handler.
  	 */
  	void (* eh_strategy_handler)(struct Scsi_Host *);
  
  	/*

  	 * This is an optional routine that allows the transport to become
  	 * involved when a scsi io timer fires. The return value tells the
  	 * timer routine how to finish the io timeout handling:
  	 * EH_HANDLED:		I fixed the error, please complete the command
  	 * EH_RESET_TIMER:	I need more time, reset the timer and
  	 *			begin counting again
  	 * EH_NOT_HANDLED	Begin normal error recovery
  	 */

  	enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);

  
  	/*
  	 * Used as callback for the completion of i_t_nexus request
  	 * for target drivers.
  	 */
  	int (* it_nexus_response)(struct Scsi_Host *, u64, int);

  
  	/*
  	 * Used as callback for the completion of task management
  	 * request for target drivers.
  	 */
  	int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int);

  };
  
  #define transport_class_to_shost(tc) \

  	dev_to_shost((tc)->parent)

  /* Private area maintenance. The driver requested allocations come
   * directly after the transport class allocations (if any).  The idea
   * is that you *must* call these only once.  The code assumes that the
   * initial values are the ones the transport specific code requires */
  static inline void
  scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
  {
  	BUG_ON(t->target_private_offset != 0);
  	t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
  	t->target_size = t->target_private_offset + space;
  }
  static inline void
  scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
  {
  	BUG_ON(t->device_private_offset != 0);
  	t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
  	t->device_size = t->device_private_offset + space;
  }
  static inline void *
  scsi_transport_target_data(struct scsi_target *starget)
  {
  	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
  	return (u8 *)starget->starget_data
  		+ shost->transportt->target_private_offset;
  
  }
  static inline void *
  scsi_transport_device_data(struct scsi_device *sdev)
  {
  	struct Scsi_Host *shost = sdev->host;
  	return (u8 *)sdev->sdev_data
  		+ shost->transportt->device_private_offset;
  }

  #endif /* SCSI_TRANSPORT_H */