[PATCH] extracting resid from struct scsi_cmnd

    - during successful command completion place resid from SCSI
      LLDs into request::data_len so that block SG_IO ioctl reports
      resid
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_lib.c

@@ -728,7 +728,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes,
 				req->sense_len = len;
 			}
 		} else
-			req->data_len -= cmd->bufflen;
+			req->data_len = cmd->resid;
 	}
 
 	/*