ref_walk_path
ref_walk_path(rw) = ref_path;
ref_walk_path(rw) + 1,
rc = get_session(mnt_ctx, ref_walk_path(rw));
return dfs_cache_get_tgt_referral(ref_walk_path(rw) + 1,
dfs_cache_noreq_update_tgthint(ref_walk_path(rw) + 1,