An object found in the delta-base cache is not guaranteed to
stay there, but we know it came from a pack and it is likely
to give us a quick access if we read_sha1_file() it right now,
which is a piece of useful information.
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
cache.h | 3 ++-
sha1_file.c | 9 +++++++++
2 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/cache.h b/cache.h
index 9fbc07e..3a1af9d 100644
--- a/cache.h
+++ b/cache.h
@@ -1030,7 +1030,8 @@ struct object_info {
enum {
OI_CACHED,
OI_LOOSE,
- OI_PACKED
+ OI_PACKED,
+ OI_DBCACHED
} whence;
union {
/*
diff --git a/sha1_file.c b/sha1_file.c
index 7eed316..1d6f93d 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1697,6 +1697,13 @@ static unsigned long pack_entry_hash(struct packed_git *p, off_t base_offset)
return hash % MAX_DELTA_CACHE;
}
+static int in_delta_base_cache(struct packed_git *p, off_t base_offset)
+{
+ unsigned long hash = pack_entry_hash(p, base_offset);
+ struct delta_base_cache_entry *ent = delta_base_cache + hash;
+ return (ent->data && ent->p == p && ent->base_offset == base_offset);
+}
+
static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset,
unsigned long *base_size, enum object_type *type, int keep_cache)
{
@@ -2128,6 +2135,8 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi)
if (status < 0) {
mark_bad_packed_object(e.p, sha1);
status = sha1_object_info_extended(sha1, oi);
+ } else if (in_delta_base_cache(e.p, e.offset)) {
+ oi->whence = OI_DBCACHED;
} else {
oi->whence = OI_PACKED;
oi->u.packed.offset = e.offset;
--
1.7.5.2.369.g8fc017
--
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