nfs_enterdircache
ndp = nfs_enterdircache(vp, uio->uio_offset,
nndp = nfs_enterdircache(vp, NFS_GETCOOKIE(pdp),
nndp = nfs_enterdircache(vp, curoff, ndp->dc_blkcookie,
nndp = nfs_enterdircache(vp, bp->b_dcookie, bp->b_dcookie, 0,0);
struct nfsdircache *nfs_enterdircache(struct vnode *, off_t, off_t, int,