LAYERFS_REMOVED
*ap->a_recycle = ((VTOLAYER(vp)->layer_flags & LAYERFS_REMOVED) != 0);
VTOLAYER(vp)->layer_flags |= LAYERFS_REMOVED;
VTOLAYER(tvp)->layer_flags |= LAYERFS_REMOVED;
VTOLAYER(vp)->layer_flags |= LAYERFS_REMOVED;
VTOLAYER(tvp)->layer_flags |= LAYERFS_REMOVED;