cachefiles_get_directory
cachedir = cachefiles_get_directory(cache, root, "cache", NULL);
graveyard = cachefiles_get_directory(cache, root, "graveyard", NULL);
extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
vdentry = cachefiles_get_directory(cache, cache->store, name, &is_new);
fan = cachefiles_get_directory(cache, vdentry, name, NULL);