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// Copyright (C) 2023 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.
#pragma once
#include "writer_base.h"
namespace android {
namespace snapshot {
class CowWriterV2 : public CowWriterBase {
public:
explicit CowWriterV2(const CowOptions& options, android::base::unique_fd&& fd);
~CowWriterV2() override;
bool Initialize(std::optional<uint64_t> label = {}) override;
bool Finalize() override;
uint64_t GetCowSize() override;
protected:
virtual bool EmitCopy(uint64_t new_block, uint64_t old_block, uint64_t num_blocks = 1) override;
virtual bool EmitRawBlocks(uint64_t new_block_start, const void* data, size_t size) override;
virtual bool EmitXorBlocks(uint32_t new_block_start, const void* data, size_t size,
uint32_t old_block, uint16_t offset) override;
virtual bool EmitZeroBlocks(uint64_t new_block_start, uint64_t num_blocks) override;
virtual bool EmitLabel(uint64_t label) override;
virtual bool EmitSequenceData(size_t num_ops, const uint32_t* data) override;
private:
bool EmitCluster();
bool EmitClusterIfNeeded();
bool EmitBlocks(uint64_t new_block_start, const void* data, size_t size, uint64_t old_block,
uint16_t offset, uint8_t type);
void SetupHeaders();
void SetupWriteOptions();
bool ParseOptions();
bool OpenForWrite();
bool OpenForAppend(uint64_t label);
bool GetDataPos(uint64_t* pos);
bool WriteRawData(const void* data, size_t size);
bool WriteOperation(const CowOperation& op, const void* data = nullptr, size_t size = 0);
void AddOperation(const CowOperation& op);
void InitPos();
void InitBatchWrites();
void InitWorkers();
bool FlushCluster();
bool CompressBlocks(size_t num_blocks, const void* data);
bool Sync();
bool Truncate(off_t length);
bool EnsureSpaceAvailable(const uint64_t bytes_needed) const;
private:
CowFooter footer_{};
CowCompression compression_;
uint64_t current_op_pos_ = 0;
uint64_t next_op_pos_ = 0;
uint64_t next_data_pos_ = 0;
uint64_t current_data_pos_ = 0;
ssize_t total_data_written_ = 0;
uint32_t cluster_size_ = 0;
uint32_t current_cluster_size_ = 0;
uint64_t current_data_size_ = 0;
bool merge_in_progress_ = false;
int num_compress_threads_ = 1;
std::vector<std::unique_ptr<CompressWorker>> compress_threads_;
std::vector<std::future<bool>> threads_;
std::vector<std::basic_string<uint8_t>> compressed_buf_;
std::vector<std::basic_string<uint8_t>>::iterator buf_iter_;
std::vector<std::unique_ptr<CowOperation>> opbuffer_vec_;
std::vector<std::unique_ptr<uint8_t[]>> databuffer_vec_;
std::unique_ptr<struct iovec[]> cowop_vec_;
int op_vec_index_ = 0;
std::unique_ptr<struct iovec[]> data_vec_;
int data_vec_index_ = 0;
bool batch_write_ = false;
};
} // namespace snapshot
} // namespace android