#ifndef _SCSI_SCSI_EH_H
  #define _SCSI_SCSI_EH_H

  #include <linux/scatterlist.h>

  #include <scsi/scsi_cmnd.h>

  struct scsi_device;

  struct Scsi_Host;
  
  /*
   * This is a slightly modified SCSI sense "descriptor" format header.
   * The addition is to allow the 0x70 and 0x71 response codes. The idea
   * is to place the salient data from either "fixed" or "descriptor" sense
   * format into one structure to ease application processing.
   *
   * The original sense buffer should be kept around for those cases
   * in which more information is required (e.g. the LBA of a MEDIUM ERROR).
   */
  struct scsi_sense_hdr {		/* See SPC-3 section 4.5 */
  	u8 response_code;	/* permit: 0x0, 0x70, 0x71, 0x72, 0x73 */
  	u8 sense_key;
  	u8 asc;
  	u8 ascq;
  	u8 byte4;
  	u8 byte5;
  	u8 byte6;
  	u8 additional_length;	/* always 0 for fixed sense format */
  };

  static inline int scsi_sense_valid(struct scsi_sense_hdr *sshdr)
  {
  	if (!sshdr)
  		return 0;
  
  	return (sshdr->response_code & 0x70) == 0x70;
  }

  extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
  			       struct list_head *done_q);
  extern void scsi_eh_flush_done_q(struct list_head *done_q);

  extern void scsi_report_bus_reset(struct Scsi_Host *, int);
  extern void scsi_report_device_reset(struct Scsi_Host *, int, int);
  extern int scsi_block_when_processing_errors(struct scsi_device *);
  extern int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
  		struct scsi_sense_hdr *sshdr);

  extern int scsi_command_normalize_sense(struct scsi_cmnd *cmd,
  		struct scsi_sense_hdr *sshdr);
  
  static inline int scsi_sense_is_deferred(struct scsi_sense_hdr *sshdr)
  {
  	return ((sshdr->response_code >= 0x70) && (sshdr->response_code & 1));
  }
  
  extern const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
  				       int desc_type);
  
  extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
  				   u64 * info_out);

  
  extern void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq);

  /*
   * Reset request from external source
   */
  #define SCSI_TRY_RESET_DEVICE	1
  #define SCSI_TRY_RESET_BUS	2
  #define SCSI_TRY_RESET_HOST	3

  #define SCSI_TRY_RESET_TARGET	4

  
  extern int scsi_reset_provider(struct scsi_device *, int);

  struct scsi_eh_save {

  	/* saved state */

  	int result;
  	enum dma_data_direction data_direction;

  	unsigned underflow;

  	unsigned char cmd_len;

  	unsigned char prot_op;

  	unsigned char *cmnd;

  	struct scsi_data_buffer sdb;

  	struct request *next_rq;

  	/* new command support */

  	unsigned char eh_cmnd[BLK_MAX_CDB];

  	struct scatterlist sense_sgl;
  };
  
  extern void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd,
  		struct scsi_eh_save *ses, unsigned char *cmnd,
  		int cmnd_size, unsigned sense_bytes);
  
  extern void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd,
  		struct scsi_eh_save *ses);

  #endif /* _SCSI_SCSI_EH_H */