On Wed, 11 Feb 2009, Shawn O. Pearce wrote:
> Daniel Barkalow <barkalow@xxxxxxxxxxxx> wrote:
> >
> > I think free_pack_by_name() also needs to drop the entries that are from
> > the freed pack, to avoid having repack able to get the same problem,
> > although I wouldn't be surprised if repack happened to never allocate a
> > new pack after freeing an old pack with stale delta cache entries, or
> > never used the delta cache after that, simply because it does one thing
> > and then exits.
>
> Oy. I missed that we added this function. Patch follows.
I think it would be more clear to do something below (instead of the
original patch); I think there's a better chance of authors knowing when
to use this function than knowing when to use a function based on what it
actually does, and there's a better chance that any future optimizations
that need to be flushed under the same conditions would get included.
--8<--
Provide a function to free a struct packed_git that may have been used
When we look up entries in a pack, we sometimes cache the results. If a
struct packed_git is freed afterwards (and its memory could be allocated
as a different struct packed_git later), we need to clear out anything
that may mis-recognize the pack.
In particular, we flush the delta cache.
Signed-off-by: Daniel Barkalow <barkalow@xxxxxxxxxxxx>
diff --git a/cache.h b/cache.h
index 8d965b8..ecc55cf 100644
--- a/cache.h
+++ b/cache.h
@@ -822,6 +822,7 @@ extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t
extern void close_pack_windows(struct packed_git *);
extern void unuse_pack(struct pack_window **);
extern void free_pack_by_name(const char *);
+extern void free_used_pack(struct packed_git *);
extern struct packed_git *add_packed_git(const char *, int, int);
extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
diff --git a/fast-import.c b/fast-import.c
index f0e08ac..8ec9a4e 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -987,7 +987,7 @@ static void end_packfile(void)
close(old_p->pack_fd);
unlink(old_p->pack_name);
}
- free(old_p);
+ free_used_pack(old_p);
/* We can't carry a delta across packfiles. */
strbuf_release(&last_blob.data);
diff --git a/sha1_file.c b/sha1_file.c
index fd4980d..5a45f51 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -696,7 +696,7 @@ void free_pack_by_name(const char *pack_name)
munmap((void *)p->index_data, p->index_size);
free(p->bad_object_sha1);
*pp = p->next;
- free(p);
+ free_used_pack(p);
return;
}
pp = &p->next;
@@ -1663,6 +1663,14 @@ static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
}
}
+void free_used_pack(struct packed_git *pack)
+{
+ unsigned long p;
+ for (p = 0; p < MAX_DELTA_CACHE; p++)
+ release_delta_base_cache(&delta_base_cache[p]);
+ free(pack);
+}
+
static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
void *base, unsigned long base_size, enum object_type type)
{
--
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