The implementation of "ref" API around the "packed refs" have been cleaned up, in preparation for further changes. * mh/packed-ref-store-prep: (25 commits) cache_ref_iterator_begin(): avoid priming unneeded directories ref-filter: limit traversal to prefix create_ref_entry(): remove `check_name` option refs_ref_iterator_begin(): handle `GIT_REF_PARANOIA` read_packed_refs(): report unexpected fopen() failures read_packed_refs(): do more of the work of reading packed refs get_packed_ref_cache(): assume "packed-refs" won't change while locked should_pack_ref(): new function, extracted from `files_pack_refs()` ref_update_reject_duplicates(): add a sanity check ref_update_reject_duplicates(): use `size_t` rather than `int` ref_update_reject_duplicates(): expose function to whole refs module ref_transaction_prepare(): new optional step for reference updates ref_transaction_commit(): check for valid `transaction->state` files_transaction_cleanup(): new helper function files_ref_store: put the packed files lock directly in this struct files-backend: move `lock` member to `files_ref_store` lockfile: add a new method, is_lock_file_locked() ref_store: take a `msg` parameter when deleting references refs: use `size_t` indexes when iterating over ref transaction updates refs_ref_iterator_begin(): don't check prefixes redundantly ...