smbfs_hash
error = vfs_hash_get(mp, smbfs_hash(name, nmlen), LK_EXCLUSIVE, td,
error = vfs_hash_insert(vp, smbfs_hash(name, nmlen), LK_EXCLUSIVE,
u_int32_t smbfs_hash(const u_char *name, int nmlen);
ino = dnp->n_ino + smbfs_hash(name, nmlen);