blob: 65c042669aa2768613c0709191c1f4da1ba5f1d0 [file] [log] [blame]
// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
namespace disk_cache {
// Short rules helping to think about data upgrades within Simple Cache:
// * ALL changes of on-disk data format, backward-compatible or not,
// forward-compatible or not, require updating the |kSimpleVersion|.
// * All cache Upgrades are performed on backend start, must be finished
// before the new backend starts processing any incoming operations.
// * If the Upgrade is not implemented for transition from
// |kSimpleVersion - 1| then the whole cache directory will be cleared.
// * Dropping cache data on disk or some of its parts can be a valid way to
// Upgrade.
const uint32_t kLastCompatSparseVersion = 7;
const uint32_t kSimpleVersion = 9;
// The version of the entry file(s) as written to disk. Must be updated iff the
// entry format changes with the overall backend version update.
const uint32_t kSimpleEntryVersionOnDisk = 5;
} // namespace disk_cache