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31 lines
1.3 KiB
C
31 lines
1.3 KiB
C
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// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_VERSION_H_
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#define NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_VERSION_H_
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#include <stdint.h>
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namespace disk_cache {
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// Short rules helping to think about data upgrades within Simple Cache:
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// * ALL changes of on-disk data format, backward-compatible or not,
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// forward-compatible or not, require updating the |kSimpleVersion|.
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// * All cache Upgrades are performed on backend start, must be finished
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// before the new backend starts processing any incoming operations.
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// * If the Upgrade is not implemented for transition from
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// |kSimpleVersion - 1| then the whole cache directory will be cleared.
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// * Dropping cache data on disk or some of its parts can be a valid way to
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// Upgrade.
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const uint32_t kLastCompatSparseVersion = 7;
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const uint32_t kSimpleVersion = 8;
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// The version of the entry file(s) as written to disk. Must be updated iff the
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// entry format changes with the overall backend version update.
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const uint32_t kSimpleEntryVersionOnDisk = 5;
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_VERSION_H_
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