1 files changed, 25 insertions, 2 deletions

diff --git a/split-index.c b/split-index.c
index 615f4cac05..284d04d67f 100644
--- a/split-index.c
+++ b/split-index.c
@@ -167,10 +167,9 @@ void merge_base_index(struct index_state *istate)
 
 	ewah_free(si->delete_bitmap);
 	ewah_free(si->replace_bitmap);
-	free(si->saved_cache);
+	FREE_AND_NULL(si->saved_cache);
 	si->delete_bitmap  = NULL;
 	si->replace_bitmap = NULL;
-	si->saved_cache	   = NULL;
 	si->saved_cache_nr = 0;
 }
 
@@ -239,6 +238,8 @@ void prepare_to_write_split_index(struct index_state *istate)
 				ALLOC_GROW(entries, nr_entries+1, nr_alloc);
 				entries[nr_entries++] = ce;
 			}
+			if (is_null_oid(&ce->oid))
+				istate->drop_cache_tree = 1;
 		}
 	}
 
@@ -317,3 +318,25 @@ void replace_index_entry_in_base(struct index_state *istate,
 		istate->split_index->base->cache[new->index - 1] = new;
 	}
 }
+
+void add_split_index(struct index_state *istate)
+{
+	if (!istate->split_index) {
+		init_split_index(istate);
+		istate->cache_changed |= SPLIT_INDEX_ORDERED;
+	}
+}
+
+void remove_split_index(struct index_state *istate)
+{
+	if (istate->split_index) {
+		/*
+		 * can't discard_split_index(&the_index); because that
+		 * will destroy split_index->base->cache[], which may
+		 * be shared with the_index.cache[]. So yeah we're
+		 * leaking a bit here.
+		 */
+		istate->split_index = NULL;
+		istate->cache_changed |= SOMETHING_CHANGED;
+	}
+}