On Tue, Aug 23, 2016 at 02:49:15PM -0700, Junio C Hamano wrote:

> > diff --git a/sha1_file.c b/sha1_file.c
> > index 1d0810c..8264b39 100644
> > --- a/sha1_file.c
> > +++ b/sha1_file.c
> > @@ -2152,10 +2152,7 @@ static inline void release_delta_base_cache(struct 
> > delta_base_cache_entry *ent)
> >  {
> >     if (ent->data) {
> >             free(ent->data);
> > -           ent->data = NULL;
> > -           ent->lru.next->prev = ent->lru.prev;
> > -           ent->lru.prev->next = ent->lru.next;
> > -           delta_base_cached -= ent->size;
> > +           detach_delta_base_cache_entry(ent);
> 
> If we were designing this from scratch, we might have made detach_*
> to return the pointer to minimize direct access to ent->data, but I
> do not think it is worth it.  Looks very sensible.

I actually looked into that during the conversion in patch 2/7. I didn't
want to just return ent->data, because there are actually several bits
of information to "rescue" from the entry. So it looks more like:

  char *data = detach_delta_base_cache_entry(ent, NULL, NULL);
  free(data);

here, and

  data = detach_delta_base_cache_entry(ent, &type, &size);

in unpack_entry().

That is not too bad, I guess. I can switch it if you prefer that way.
Since there are only these two callers with two different sets of needs
(and the function is static), I just let them continue inspecting the
elements directly.

-Peff
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