[PATCH v4 07/21] refs: add method for delete_refs

[David Turner <dturner@twopensource.com>]

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>
---
 refs.c               | 5 +++++
 refs/files-backend.c | 3 ++-
 refs/refs-internal.h | 2 ++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/refs.c b/refs.c
index d481a94..5fbe794 100644
--- a/refs.c
+++ b/refs.c
@@ -1123,6 +1123,11 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 	return the_refs_backend->transaction_commit(transaction, err);
 }
 
+int delete_refs(struct string_list *refnames)
+{
+	return the_refs_backend->delete_refs(refnames);
+}
+
 const char *resolve_ref_unsafe(const char *ref, int resolve_flags,
 			       unsigned char *sha1, int *flags)
 {
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 723127e..e86849c 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2380,7 +2380,7 @@ static int delete_ref_loose(struct ref_lock *lock, int flag, struct strbuf *err)
 	return 0;
 }
 
-int delete_refs(struct string_list *refnames)
+static int files_delete_refs(struct string_list *refnames)
 {
 	struct strbuf err = STRBUF_INIT;
 	int i, result = 0;
@@ -3575,6 +3575,7 @@ struct ref_storage_be refs_be_files = {
 	files_pack_refs,
 	files_peel_ref,
 	files_create_symref,
+	files_delete_refs,
 
 	files_resolve_ref_unsafe,
 	files_verify_refname_available,
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 142c663..1d9e5e0 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -236,6 +236,7 @@ typedef int peel_ref_fn(const char *refname, unsigned char *sha1);
 typedef int create_symref_fn(const char *ref_target,
 			     const char *refs_heads_master,
 			     const char *logmsg);
+typedef int delete_refs_fn(struct string_list *refnames);
 
 /* resolution methods */
 typedef const char *resolve_ref_unsafe_fn(const char *ref,
@@ -280,6 +281,7 @@ struct ref_storage_be {
 	pack_refs_fn *pack_refs;
 	peel_ref_fn *peel_ref;
 	create_symref_fn *create_symref;
+	delete_refs_fn *delete_refs;
 
 	resolve_ref_unsafe_fn *resolve_ref_unsafe;
 	verify_refname_available_fn *verify_refname_available;
-- 
2.4.2.749.g730654d-twtrsrc