76 lines
3.0 KiB
C++
76 lines
3.0 KiB
C++
//
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// Copyright (C) 2021 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 UPDATE_ENGINE_PAYLOAD_GENERATOR_EROFS_FILESYSTEM_H_
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#define UPDATE_ENGINE_PAYLOAD_GENERATOR_EROFS_FILESYSTEM_H_
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#include "update_engine/payload_generator/filesystem_interface.h"
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#include "update_engine/payload_generator/delta_diff_generator.h"
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namespace chromeos_update_engine {
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class ErofsFilesystem final : public FilesystemInterface {
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public:
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// Creates an ErofsFilesystem from a erofs formatted filesystem stored in a
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// file. The file doesn't need to be loop-back mounted. Since erofs-utils
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// library functions are not concurrency safe(can't be used in multi-threaded
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// context, can't even work with multiple EROFS images concurrently on 1
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// thread), this function takes a global mutex.
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static std::unique_ptr<ErofsFilesystem> CreateFromFile(
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const std::string& filename,
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const CompressionAlgorithm& algo =
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PartitionConfig::GetDefaultCompressionParam());
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virtual ~ErofsFilesystem() = default;
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// FilesystemInterface overrides.
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size_t GetBlockSize() const override { return kBlockSize; }
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size_t GetBlockCount() const override { return fs_size_ / kBlockSize; }
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// GetFiles will return one FilesystemInterface::File for every file and every
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// directory in the filesystem. Hard-linked files will appear in the list
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// several times with the same list of blocks.
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// On addition to actual files, it also returns these pseudo-files:
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// <free-space>: With all the unallocated data-blocks.
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// <inode-blocks>: Will all the data-blocks for second and third level inodes
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// of all the files.
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// <group-descriptors>: With the block group descriptor and their reserved
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// space.
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// <metadata>: With the rest of ext2 metadata blocks, such as superblocks
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// and bitmap tables.
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static bool GetFiles(const std::string& filename,
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std::vector<File>* files,
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const CompressionAlgorithm& algo);
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bool GetFiles(std::vector<File>* files) const override;
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bool LoadSettings(
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[[maybe_unused]] brillo::KeyValueStore* store) const override {
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return true;
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}
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private:
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ErofsFilesystem(std::string filename, size_t fs_size, std::vector<File> files)
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: filename_(filename), fs_size_(fs_size), files_(std::move(files)) {}
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// The file where the filesystem is stored.
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const std::string filename_;
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const size_t fs_size_;
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const std::vector<File> files_;
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}; // namespace chromeos_update_engine
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} // namespace chromeos_update_engine
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#endif |