dm mpath: reduce size of struct multipath

	struct list_head list;

	struct dm_target *ti;

	spinlock_t lock;

	const char *hw_handler_name;

	char *hw_handler_params;

	spinlock_t lock;

	unsigned nr_priority_groups;

	struct list_head priority_groups;

	struct priority_group *next_pg;	/* Switch to this PG if set */

	unsigned repeat_count;		/* I/Os left before calling PS again */

	unsigned queue_io;		/* Must we queue all I/O? */

	unsigned queue_if_no_path;	/* Queue I/O if last path fails? */

	unsigned saved_queue_if_no_path;/* Saved state during suspension */

	unsigned queue_io:1;		/* Must we queue all I/O? */

	unsigned queue_if_no_path:1;	/* Queue I/O if last path fails? */

	unsigned saved_queue_if_no_path:1; /* Saved state during suspension */

	unsigned pg_init_retries;	/* Number of times to retry pg_init */

	unsigned pg_init_count;		/* Number of times pg_init called */

	unsigned pg_init_delay_msecs;	/* Number of msecs before pg_init retry */

	unsigned queue_size;

	struct work_struct process_queued_ios;

	struct list_head queued_ios;

	unsigned queue_size;

	struct work_struct trigger_event;