VEXPLICIT_DENY
error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS |
if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0)
accmode &= ~VEXPLICIT_DENY;
if (*accmode & VEXPLICIT_DENY) {
error = VOP_ACCESSX(vdp, VEXPLICIT_DENY | VDELETE_CHILD, cred, td);