MOUNTTOLAYERMOUNT
(*MOUNTTOLAYERMOUNT((vp)->v_mount)->layerm_bypass)((ap))
vp = MOUNTTOLAYERMOUNT(mp)->layerm_rootvp;
struct layer_mount *lmp = MOUNTTOLAYERMOUNT(mp);
flags = MOUNTTOLAYERMOUNT(mp)->layerm_flags;
struct layer_mount *lmp = MOUNTTOLAYERMOUNT(vp->v_mount);
lmp = MOUNTTOLAYERMOUNT(mp);
lmp = MOUNTTOLAYERMOUNT(mp);