./"flags"8t"nrm"8t"cv"8t"mapping         selock"nBBx2X
+/"vnode"16t"offset"16t"hash"16t"vpnext"n4X
+/"vpprev"16t"iolock.type"16t"iolock.waiters"nXB16t+d
+/"iolock.count"16t"next"16t"prev"nD2X
+/"lckcnt"8t"cowcnt"8t"pagenum"n2xX4+
