cnid_t cnid_add (struct _cnid_db *cdb, const struct stat *st, const cnid_t did,
const char *name, const size_t len, cnid_t hint);
int cnid_delete (struct _cnid_db *cdb, cnid_t id);
cnid_t cnid_add (struct _cnid_db *cdb, const struct stat *st, const cnid_t did,
const char *name, const size_t len, cnid_t hint);
int cnid_delete (struct _cnid_db *cdb, cnid_t id);