Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 refs.c               | 10 ++++++++++
 refs/files-backend.c | 14 ++++++++------
 refs/refs-internal.h |  7 +++++++
 3 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/refs.c b/refs.c
index 7a7adeb..662c417 100644
--- a/refs.c
+++ b/refs.c
@@ -1428,3 +1428,13 @@ int ref_transaction_commit(struct ref_transaction 
*transaction,
 
        return refs->be->transaction_commit(refs, transaction, err);
 }
+
+int verify_refname_available(const char *refname,
+                            const struct string_list *extra,
+                            const struct string_list *skip,
+                            struct strbuf *err)
+{
+       struct ref_store *refs = get_ref_store(NULL);
+
+       return refs->be->verify_refname_available(refs, refname, extra, skip, 
err);
+}
diff --git a/refs/files-backend.c b/refs/files-backend.c
index ff11a51..4e1d431 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2549,13 +2549,14 @@ static int rename_tmp_log(const char *newrefname)
        return ret;
 }
 
-int verify_refname_available(const char *newname,
-                            const struct string_list *extras,
-                            const struct string_list *skip,
-                            struct strbuf *err)
+static int files_verify_refname_available(struct ref_store *ref_store,
+                                         const char *newname,
+                                         const struct string_list *extras,
+                                         const struct string_list *skip,
+                                         struct strbuf *err)
 {
        struct files_ref_store *refs =
-               get_files_ref_store(NULL, "verify_refname_available");
+               files_downcast(ref_store, 1, "verify_refname_available");
        struct ref_dir *packed_refs = get_packed_refs(refs);
        struct ref_dir *loose_refs = get_loose_refs(refs);
 
@@ -4031,5 +4032,6 @@ struct ref_storage_be refs_be_files = {
        files_ref_store_create,
        files_transaction_commit,
 
-       files_read_raw_ref
+       files_read_raw_ref,
+       files_verify_refname_available
 };
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 19cb6e1..6c698f4 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -542,6 +542,12 @@ typedef int read_raw_ref_fn(struct ref_store *ref_store,
                            const char *refname, unsigned char *sha1,
                            struct strbuf *referent, unsigned int *type);
 
+typedef int verify_refname_available_fn(struct ref_store *ref_store,
+                                       const char *newname,
+                                       const struct string_list *extras,
+                                       const struct string_list *skip,
+                                       struct strbuf *err);
+
 struct ref_storage_be {
        struct ref_storage_be *next;
        const char *name;
@@ -549,6 +555,7 @@ struct ref_storage_be {
        ref_transaction_commit_fn *transaction_commit;
 
        read_raw_ref_fn *read_raw_ref;
+       verify_refname_available_fn *verify_refname_available;
 };
 
 extern struct ref_storage_be refs_be_files;
-- 
2.9.3

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