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57 lines
2.0 KiB
57 lines
2.0 KiB
//
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// Copyright (C) 2020 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef __COW_OPERATION_CONVERT_H
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#define __COW_OPERATION_CONVERT_H
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#include <vector>
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#include <libsnapshot/cow_format.h>
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#include "update_engine/update_metadata.pb.h"
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namespace chromeos_update_engine {
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struct CowOperation {
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enum Type {
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CowCopy = android::snapshot::kCowCopyOp,
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CowReplace = android::snapshot::kCowReplaceOp,
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};
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Type op;
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uint64_t src_block;
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uint64_t dst_block;
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};
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// Convert SOURCE_COPY operations in `operations` list to a list of
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// CowOperations according to the merge sequence. This function only converts
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// SOURCE_COPY, other operations are ignored. If there's a merge conflict in
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// SOURCE_COPY operations, some blocks may be converted to COW_REPLACE instead
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// of COW_COPY.
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// The list returned does not necessarily preserve the order of
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// SOURCE_COPY in `operations`. The only guarantee about ordering in the
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// returned list is that if operations are applied in such order, there would be
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// no merge conflicts.
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// This funnction is intended to be used by delta_performer to perform
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// SOURCE_COPY operations on Virtual AB Compression devices.
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std::vector<CowOperation> ConvertToCowOperations(
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const ::google::protobuf::RepeatedPtrField<
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::chromeos_update_engine::InstallOperation>& operations,
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const ::google::protobuf::RepeatedPtrField<CowMergeOperation>&
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merge_operations);
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} // namespace chromeos_update_engine
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#endif
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