files_transaction_cleanup(): new helper function

Extract the cleanup functionality from `files_transaction_commit()`
into a new function. It will soon have another caller.

Use the common cleanup code even on early exit if the transaction is
empty, to reduce code duplication.

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

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 1db40432af1db5a648d8ea9fd2a6fced5a648f21..2c70de5209b223f83d91718a536a6a88c84dad57 100644 (file)
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2834,6 +2834,27 @@ static int lock_ref_for_update(struct files_ref_store *refs,
        return 0;
 }
 
+/*
+ * Unlock any references in `transaction` that are still locked, and
+ * mark the transaction closed.
+ */
+static void files_transaction_cleanup(struct ref_transaction *transaction)
+{
+       size_t i;
+
+       for (i = 0; i < transaction->nr; i++) {
+               struct ref_update *update = transaction->updates[i];
+               struct ref_lock *lock = update->backend_data;
+
+               if (lock) {
+                       unlock_ref(lock);
+                       update->backend_data = NULL;
+               }
+       }
+
+       transaction->state = REF_TRANSACTION_CLOSED;
+}
+
 static int files_transaction_commit(struct ref_store *ref_store,
                                    struct ref_transaction *transaction,
                                    struct strbuf *err)
@@ -2856,10 +2877,8 @@ static int files_transaction_commit(struct ref_store *ref_store,
        if (transaction->state != REF_TRANSACTION_OPEN)
                die("BUG: commit called for transaction that is not open");
 
-       if (!transaction->nr) {
-               transaction->state = REF_TRANSACTION_CLOSED;
-               return 0;
-       }
+       if (!transaction->nr)
+               goto cleanup;
 
        /*
         * Fail if a refname appears more than once in the
@@ -3005,15 +3024,11 @@ static int files_transaction_commit(struct ref_store *ref_store,
        clear_loose_ref_cache(refs);
 
 cleanup:
+       files_transaction_cleanup(transaction);
        strbuf_release(&sb);
-       transaction->state = REF_TRANSACTION_CLOSED;
 
        for (i = 0; i < transaction->nr; i++) {
                struct ref_update *update = transaction->updates[i];
-               struct ref_lock *lock = update->backend_data;
-
-               if (lock)
-                       unlock_ref(lock);
 
                if (update->flags & REF_DELETED_LOOSE) {
                        /*