/* For each regular file, we must check to see if the file is in
* the lookup table already; if it is, we increment its refcnt;
* otherwise, we create a new lookup table entry and insert it.
/* For each regular file, we must check to see if the file is in
* the lookup table already; if it is, we increment its refcnt;
* otherwise, we create a new lookup table entry and insert it.