From: David Turner <dtur...@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 <dtur...@twopensource.com>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 refs.c               | 7 +++++++
 refs/files-backend.c | 6 ++++--
 refs/refs-internal.h | 3 +++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/refs.c b/refs.c
index 3830918..6efa859 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);
+}
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 81008d7..bcaa958 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2451,10 +2451,11 @@ static int delete_ref_loose(struct ref_lock *lock, int 
flag, struct strbuf *err)
        return 0;
 }
 
-int delete_refs(struct string_list *refnames, unsigned int flags)
+static int files_delete_refs(struct ref_store *ref_store,
+                            struct string_list *refnames, unsigned int flags)
 {
        struct files_ref_store *refs =
-               get_files_ref_store(NULL, "delete_refs");
+               files_downcast(ref_store, 0, "delete_refs");
        struct strbuf err = STRBUF_INIT;
        int i, result = 0;
 
@@ -4077,6 +4078,7 @@ struct ref_storage_be refs_be_files = {
        files_pack_refs,
        files_peel_ref,
        files_create_symref,
+       files_delete_refs,
 
        files_ref_iterator_begin,
        files_read_raw_ref,
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 08c8586..ade6501 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -490,6 +490,8 @@ typedef int create_symref_fn(struct ref_store *ref_store,
                             const char *ref_target,
                             const char *refs_heads_master,
                             const char *logmsg);
+typedef int delete_refs_fn(struct ref_store *ref_store,
+                          struct string_list *refnames, unsigned int flags);
 
 /*
  * Iterate over the references in the specified ref_store that are
@@ -587,6 +589,7 @@ struct ref_storage_be {
        pack_refs_fn *pack_refs;
        peel_ref_fn *peel_ref;
        create_symref_fn *create_symref;
+       delete_refs_fn *delete_refs;
 
        ref_iterator_begin_fn *iterator_begin;
        read_raw_ref_fn *read_raw_ref;
-- 
2.9.3

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