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