1 // 2 // Copyright (C) 2020 The Android Open Source Project 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #ifndef UPDATE_ENGINE_VABC_PARTITION_WRITER_H_ 18 #define UPDATE_ENGINE_VABC_PARTITION_WRITER_H_ 19 20 #include <memory> 21 #include <vector> 22 23 #include <libsnapshot/snapshot_writer.h> 24 25 #include "update_engine/common/cow_operation_convert.h" 26 #include "update_engine/payload_consumer/install_plan.h" 27 #include "update_engine/payload_consumer/partition_writer.h" 28 29 namespace chromeos_update_engine { 30 class VABCPartitionWriter final : public PartitionWriter { 31 public: 32 using PartitionWriter::PartitionWriter; 33 [[nodiscard]] bool Init(const InstallPlan* install_plan, 34 bool source_may_exist, 35 size_t next_op_index) override; 36 ~VABCPartitionWriter() override; 37 38 [[nodiscard]] std::unique_ptr<ExtentWriter> CreateBaseExtentWriter() override; 39 40 // Only ZERO and SOURCE_COPY InstallOperations are treated special by VABC 41 // Partition Writer. These operations correspond to COW_ZERO and COW_COPY. All 42 // other operations just get converted to COW_REPLACE. 43 [[nodiscard]] bool PerformZeroOrDiscardOperation( 44 const InstallOperation& operation) override; 45 [[nodiscard]] bool PerformSourceCopyOperation( 46 const InstallOperation& operation, ErrorCode* error) override; 47 48 void CheckpointUpdateProgress(size_t next_op_index) override; 49 50 static bool WriteAllCowOps(size_t block_size, 51 const std::vector<CowOperation>& converted, 52 android::snapshot::ICowWriter* cow_writer, 53 FileDescriptorPtr source_fd); 54 55 [[nodiscard]] bool FinishedInstallOps() override; 56 57 private: 58 std::unique_ptr<android::snapshot::ISnapshotWriter> cow_writer_; 59 }; 60 61 } // namespace chromeos_update_engine 62 63 #endif 64