74 struct blk_desc {  struct
79 	enum if_type	if_type;	/* type of the interface */
80 	int		devnum;		/* device number */
81 	unsigned char	part_type;	/* partition type */
82 	unsigned char	target;		/* target SCSI ID */
83 	unsigned char	lun;		/* target LUN */
84 	unsigned char	hwpart;		/* HW partition, e.g. for eMMC */
108 	 * For now we have a few functions which take struct blk_desc as a  argument
114 	unsigned long	(*block_read)(struct blk_desc *block_dev,  argument
118 	unsigned long	(*block_write)(struct blk_desc *block_dev,  argument
122 	unsigned long	(*block_erase)(struct blk_desc *block_dev,  argument
131 #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz))  argument
132 #define PAD_TO_BLOCKSIZE(size, blk_desc) \  argument