union_mount
extern int union_mkshadow(struct union_mount *, struct vnode *,
extern int union_mkwhiteout(struct union_mount *, struct vnode *,
#define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
struct union_mount *um;
union_mkshadow(struct union_mount *um, struct vnode *dvp,
union_mkwhiteout(struct union_mount *um, struct vnode *dvp,
struct union_mount *um = 0;
struct union_mount *um = MOUNTTOUNIONMOUNT(mp);
struct union_mount *um = MOUNTTOUNIONMOUNT(mp);
struct union_mount *um = MOUNTTOUNIONMOUNT(mp);
struct union_mount *um = MOUNTTOUNIONMOUNT(mp);
struct union_mount *um = MOUNTTOUNIONMOUNT(mp);
.vfs_mount = union_mount,
struct union_mount *um = MOUNTTOUNIONMOUNT(dvp->v_mount);
struct union_mount *um = MOUNTTOUNIONMOUNT(vp->v_mount);