189 typedef struct	req_q {  struct
190     struct req_q	*next;	    /* next in free, issue or discon queue  */  argument
191     struct req_q	*link;	    /* next linked command to execute       */  argument
192     struct scsipi_xfer	*xs;	    /* request from high-level driver       */
193     u_short		dr_flag;    /* driver state			    */
194     u_char		phase;	    /* current SCSI phase		    */
195     u_char		msgout;	    /* message to send when requested       */
196     u_char		targ_id;    /* target for command		    */
197     u_char		targ_lun;   /* lun for command			    */
198     u_char		status;	    /* returned status byte		    */
199     u_char		message;    /* returned message byte		    */
200     u_char		*bounceb;   /* allocated bounce buffer		    */
201     u_char		*bouncerp;  /* bounce read-pointer		    */
202     struct dma_chain	dm_chain[MAXDMAIO];
203     struct dma_chain	*dm_cur;    /* current DMA-request		    */
204     struct dma_chain	*dm_last;   /* last DMA-request			    */
205     long		xdata_len;  /* length of transfer		    */
206     u_char		*xdata_ptr; /* virtual address of transfer	    */
207     struct scsipi_generic xcmd;	    /* command to execute		    */
208      int                xcmd_len;   /* command length                       */