scsi: core: Move resid from scsi_data_buffer to scsi_cmnd

This patch does not change any functionality but reduces the size of
struct scsi_cmnd.

Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi_lib.c

@@ -938,7 +938,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 		 * scsi_result_to_blk_status may have reset the host_byte
 		 */
 		scsi_req(req)->result = cmd->result;
-		scsi_req(req)->resid_len = scsi_get_resid(cmd);
 	}
 
 	/*

include/scsi/scsi_cmnd.h

@@ -35,7 +35,6 @@ struct scsi_driver;
 struct scsi_data_buffer {
 	struct sg_table table;
 	unsigned length;
-	int resid;
 };
 
 /* embedded in scsi_cmnd */
@@ -202,12 +201,12 @@ static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
 
 static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
 {
-	cmd->sdb.resid = resid;
+	cmd->req.resid_len = resid;
 }
 
 static inline int scsi_get_resid(struct scsi_cmnd *cmd)
 {
-	return cmd->sdb.resid;
+	return cmd->req.resid_len;
 }
 
 #define scsi_for_each_sg(cmd, sg, nseg, __i)			\