object-store: factor out odb_clear_loose_cache()

Add and use a function for emptying the loose object cache, so callers
don't have to know any of its implementation details.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

object-store.h

@@ -61,6 +61,9 @@ void odb_load_loose_cache(struct object_directory *odb, int subdir_nr);
 struct oid_array *odb_loose_cache(struct object_directory *odb,
 				  const struct object_id *oid);
 
+/* Empty the loose object cache for the specified object directory. */
+void odb_clear_loose_cache(struct object_directory *odb);
+
 struct packed_git {
 	struct packed_git *next;
 	struct list_head mru;

object.c

@@ -485,7 +485,7 @@ struct raw_object_store *raw_object_store_new(void)
 static void free_object_directory(struct object_directory *odb)
 {
 	free(odb->path);
-	oid_array_clear(&odb->loose_objects_cache);
+	odb_clear_loose_cache(odb);
 	free(odb);
 }
 

packfile.c

@@ -994,11 +994,8 @@ void reprepare_packed_git(struct repository *r)
 {
 	struct object_directory *odb;
 
-	for (odb = r->objects->odb; odb; odb = odb->next) {
-		oid_array_clear(&odb->loose_objects_cache);
-		memset(&odb->loose_objects_subdir_seen, 0,
-		       sizeof(odb->loose_objects_subdir_seen));
-	}
+	for (odb = r->objects->odb; odb; odb = odb->next)
+		odb_clear_loose_cache(odb);
 
 	r->objects->approximate_object_count_valid = 0;
 	r->objects->packed_git_initialized = 0;

sha1-file.c

@@ -2178,6 +2178,13 @@ void odb_load_loose_cache(struct object_directory *odb, int subdir_nr)
 	strbuf_release(&buf);
 }
 
+void odb_clear_loose_cache(struct object_directory *odb)
+{
+	oid_array_clear(&odb->loose_objects_cache);
+	memset(&odb->loose_objects_subdir_seen, 0,
+	       sizeof(odb->loose_objects_subdir_seen));
+}
+
 static int check_stream_sha1(git_zstream *stream,
 			     const char *hdr,
 			     unsigned long size,