./"flags"nXn"forw"16t"back"16t"av_forw"16t"av_back"n4X"bcount"16t"bufsize"16t"error"8t"major"8t"minor"nDDdbbn"addr"16t"blkno"16t"resid"16t"proc"nXDDXn +,<9-1$<buf