Re: [PATCH 03/16] refs: implement releasing ref storages

> diff --git a/refs/debug.c b/refs/debug.c
> index 58fb4557ed..27aae42134 100644
> --- a/refs/debug.c
> +++ b/refs/debug.c
> @@ -33,6 +33,12 @@ struct ref_store *maybe_debug_wrap_ref_store(const char *gitdir, struct ref_stor
>  	return (struct ref_store *)res;
>  }
>
> +static void debug_release(struct ref_store *refs)
> +{
> +	struct debug_ref_store *drefs = (struct debug_ref_store *)refs;

> +	drefs->refs->be->release(drefs->refs);
> +}
> +
>  static int debug_create(struct ref_store *refs, int flags, struct strbuf *err)
>  {
>  	struct debug_ref_store *drefs = (struct debug_ref_store *)refs;
> @@ -427,6 +433,7 @@ static int debug_reflog_expire(struct ref_store *ref_store, const char *refname,
>  struct ref_storage_be refs_be_debug = {
>  	.name = "debug",
>  	.init = NULL,
> +	.release = debug_release,
>  	.create = debug_create,
>
>  	/*
> diff --git a/refs/files-backend.c b/refs/files-backend.c
> index f766d18d5a..368df075c1 100644
> --- a/refs/files-backend.c
> +++ b/refs/files-backend.c
> @@ -149,6 +149,14 @@ static struct files_ref_store *files_downcast(struct ref_store *ref_store,
>  	return refs;
>  }
>
> +static void files_ref_store_release(struct ref_store *ref_store)
> +{
> +	struct files_ref_store *refs = files_downcast(ref_store, 0, "release");
> +	free_ref_cache(refs->loose);
> +	free(refs->gitcommondir);
> +	ref_store_release(refs->packed_ref_store);
> +}
> +
>  static void files_reflog_path(struct files_ref_store *refs,
>  			      struct strbuf *sb,
>  			      const char *refname)
> @@ -3284,6 +3292,7 @@ static int files_ref_store_create(struct ref_store *ref_store,
>  struct ref_storage_be refs_be_files = {
>  	.name = "files",
>  	.init = files_ref_store_init,
> +	.release = files_ref_store_release,
>  	.create = files_ref_store_create,
>  	.transaction_prepare = files_transaction_prepare,
>  	.transaction_finish = files_transaction_finish,
> diff --git a/refs/packed-backend.c b/refs/packed-backend.c
> index 716513efed..bebceb4aa7 100644
> --- a/refs/packed-backend.c
> +++ b/refs/packed-backend.c
> @@ -252,6 +252,15 @@ static void clear_snapshot(struct packed_ref_store *refs)
>  	}
>  }
>
> +static void packed_ref_store_release(struct ref_store *ref_store)
> +{
> +	struct packed_ref_store *refs = packed_downcast(ref_store, 0, "release");
> +	clear_snapshot(refs);
> +	rollback_lock_file(&refs->lock);
> +	delete_tempfile(&refs->tempfile);
> +	free(refs->path);
> +}

>  static NORETURN void die_unterminated_line(const char *path,
>  					   const char *p, size_t len)
>  {
> @@ -1707,6 +1716,7 @@ static struct ref_iterator *packed_reflog_iterator_begin(struct ref_store *ref_s
>  struct ref_storage_be refs_be_packed = {
>  	.name = "packed",
>  	.init = packed_ref_store_init,
> +	.release = packed_ref_store_release,
>  	.create = packed_ref_store_create,
>  	.transaction_prepare = packed_transaction_prepare,
>  	.transaction_finish = packed_transaction_finish,
> diff --git a/refs/refs-internal.h b/refs/refs-internal.h
> index eb42212764..cc1fe6e633 100644
> --- a/refs/refs-internal.h
> +++ b/refs/refs-internal.h
> @@ -530,6 +530,11 @@ typedef struct ref_store *ref_store_init_fn(struct repository *repo,
>  					    const char *gitdir,
>  					    unsigned int flags);
>
> +/*
> + * Release all memory and resources associated with the ref store.
> + */
> +typedef void ref_store_release_fn(struct ref_store *refs);
> +
>  typedef int ref_store_create_fn(struct ref_store *refs,
>  				int flags,
>  				struct strbuf *err);
> @@ -668,6 +673,7 @@ typedef int read_symbolic_ref_fn(struct ref_store *ref_store, const char *refnam
>  struct ref_storage_be {
>  	const char *name;
>  	ref_store_init_fn *init;
> +	ref_store_release_fn *release;
>  	ref_store_create_fn *create;
>
>  	ref_transaction_prepare_fn *transaction_prepare;
> diff --git a/refs/reftable-backend.c b/refs/reftable-backend.c
> index a4bb71cd76..6c262c2193 100644
> --- a/refs/reftable-backend.c
> +++ b/refs/reftable-backend.c
> @@ -293,6 +293,27 @@ static struct ref_store *reftable_be_init(struct repository *repo,
>  	return &refs->base;
>  }
>
> +static void reftable_be_release(struct ref_store *ref_store)
> +{
> +	struct reftable_ref_store *refs = reftable_be_downcast(ref_store, 0, "release");
> +	struct strmap_entry *entry;
> +	struct hashmap_iter iter;
> +
> +	if (refs->main_stack) {
> +		reftable_stack_destroy(refs->main_stack);
> +		refs->main_stack = NULL;
> +	}
> +
> +	if (refs->worktree_stack) {
> +		reftable_stack_destroy(refs->worktree_stack);
> +		refs->main_stack = NULL;

> +	}
> +
> +	strmap_for_each_entry(&refs->worktree_stacks, &iter, entry)
> +		reftable_stack_destroy(entry->value);
> +	strmap_clear(&refs->worktree_stacks, 0);
> +}
> +
>  static int reftable_be_create(struct ref_store *ref_store,
>  			      int flags UNUSED,
>  			      struct strbuf *err UNUSED)
> @@ -2248,6 +2269,7 @@ static int reftable_be_reflog_expire(struct ref_store *ref_store,
>  struct ref_storage_be refs_be_reftable = {
>  	.name = "reftable",
>  	.init = reftable_be_init,
> +	.release = reftable_be_release,
>  	.create = reftable_be_create,
>  	.transaction_prepare = reftable_be_transaction_prepare,
>  	.transaction_finish = reftable_be_transaction_finish,
> --
> 2.45.1.190.g19fe900cfc.dirty