refs: make lock generic

Instead of including a files-backend-specific struct ref_lock, change
the generic ref_update struct to include a void pointer that backends
can use for their own arbitrary data.

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, 1 insertions, 1 deletions

diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index c598cb19ab..681982becd 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -162,7 +162,7 @@ struct ref_update {
 	 */
 	unsigned int flags;
 
-	struct ref_lock *lock;
+	void *backend_data;
 	unsigned int type;
 	char *msg;