aac_blockread64
struct aac_blockread64 *br = (struct aac_blockread64 *) \
sizeof (struct aac_blockread64) + (acp->left_cookien - 1) * \
aac_blockread64 aac_raw_io aac_sg_entry aac_sg_entry64 aac_sg_entryraw \
struct aac_blockread64 *br =
(struct aac_blockread64 *)fibp->data;