[PATCH] Rearrange a few struct request members

	void *elevator_private;

	void *completion_data;

	unsigned short ioprio;

	int rq_status;	/* should split this into a few status bits */

	struct gendisk *rq_disk;

	int errors;

	struct gendisk *rq_disk;

	unsigned long start_time;

	/* Number of scatter-gather DMA addr+len pairs after

	 */

	unsigned short nr_hw_segments;

	unsigned short ioprio;

	int tag;

	char *buffer;

	int ref_count;

	request_queue_t *q;

	struct completion *waiting;

	void *special;

	char *buffer;

	/*

	 * when request is used as a packet command carrier

	unsigned char cmd[BLK_MAX_CDB];

	unsigned int data_len;

	void *data;

	unsigned int sense_len;

	void *data;

	void *sense;

	unsigned int timeout;