refs: make delete_refs() virtual

In the file-based backend, delete_refs has some special optimization
to deal with packed refs.  In other backends, we might be able to make
ref deletion faster by putting all deletions into a single
transaction.  So we need a special backend function for this.

Signed-off-by: David Turner <dturner@twopensource.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/refs.c b/refs.c
index 693d10f..f26601d 100644
--- a/refs.c
+++ b/refs.c
@@ -1532,3 +1532,10 @@ int initial_ref_transaction_commit(struct ref_transaction *transaction,
 
 	return refs->be->initial_transaction_commit(refs, transaction, err);
 }
+
+int delete_refs(struct string_list *refnames, unsigned int flags)
+{
+	struct ref_store *refs = get_ref_store(NULL);
+
+	return refs->be->delete_refs(refs, refnames, flags);
+}