s390/dasd: reshuffle struct dasd_ccw_req

struct dasd_ccw_req {

	unsigned int magic;		/* Eye catcher */

	int intrc;			/* internal error, e.g. from start_IO */

	struct list_head devlist;	/* for dasd_device request queue */

	struct list_head blocklist;	/* for dasd_block request queue */

	/* Where to execute what... */

	struct dasd_block *block;	/* the originating block device */

	struct dasd_device *memdev;	/* the device used to allocate this */

	struct dasd_device *startdev;	/* device the request is started on */

	struct dasd_device *basedev;	/* base device if no block->base */

	void *cpaddr;			/* address of ccw or tcw */

	short retries;			/* A retry counter */

	unsigned char cpmode;		/* 0 = cmd mode, 1 = itcw */

	char status;			/* status of this request */

	short retries;			/* A retry counter */

	char lpm;			/* logical path mask */

	unsigned long flags;        	/* flags of this request */

	struct dasd_queue *dq;

	/* ... and how */

	unsigned long starttime;	/* jiffies time of request start */

	unsigned long expires;		/* expiration period in jiffies */

	char lpm;			/* logical path mask */

	void *data;			/* pointer to data area */

	/* these are important for recovering erroneous requests          */

	int intrc;			/* internal error, e.g. from start_IO */

	struct irb irb;			/* device status in case of an error */

	struct dasd_ccw_req *refers;	/* ERP-chain queueing. */

	void *function; 		/* originating ERP action */

	void *mem_chunk;

	/* these are for statistics only */

	unsigned long buildclk;		/* TOD-clock of request generation */

	unsigned long startclk;		/* TOD-clock of request start */

	unsigned long stopclk;		/* TOD-clock of request interrupt */

	unsigned long endclk;		/* TOD-clock of request termination */

        /* Callback that is called after reaching final status. */

	void (*callback)(struct dasd_ccw_req *, void *data);

	void *callback_data;

};