spa_history_log_to_phys
phys_bof = spa_history_log_to_phys(shpp->sh_bof, shpp);
phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
phys_read_off = spa_history_log_to_phys(*offp, shpp);