./a"b_flags: "Xna"b_forw:  "X"b_back: "Xn
+/a"av_forw: "X"av_back:"Xna"b_active:"X"b_bufsize: "Xn
+/a"b_error: "d"b_dev:    "xn
+/a"b_addr:  "X"b_blkno:  "Dna"b_resid: "D"b_proc: "Xn
+/a"b_iodone: "p"         b_vp:   "Xn
+/a"b_pfcent:"D"b_bitmap:"Xn
