ioaccel2_sg_element
struct ioaccel2_sg_element *chain_block;
struct ioaccel2_sg_element *chain_sg;
struct ioaccel2_sg_element *curr_sg;
BUILD_BUG_ON(sizeof(struct ioaccel2_sg_element) != 16);
struct ioaccel2_sg_element **ioaccel2_cmd_sg_list;
struct ioaccel2_sg_element sg[IOACCEL2_MAXSGENTRIES];