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80 lines
2.6 KiB
80 lines
2.6 KiB
//
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// Copyright (C) 2015 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_EXT2_FILESYSTEM_H_
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#define UPDATE_ENGINE_PAYLOAD_GENERATOR_EXT2_FILESYSTEM_H_
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#include "update_engine/payload_generator/filesystem_interface.h"
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#include <memory>
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#include <string>
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#include <vector>
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#if defined(__clang__)
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// TODO: Remove these pragmas when b/35721782 is fixed.
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wmacro-redefined"
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#endif
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#include <ext2fs/ext2fs.h>
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#if defined(__clang__)
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#pragma clang diagnostic pop
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#endif
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namespace chromeos_update_engine {
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class Ext2Filesystem : public FilesystemInterface {
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public:
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// Creates an Ext2Filesystem from a ext2 formatted filesystem stored in a
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// file. The file doesn't need to be loop-back mounted.
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static std::unique_ptr<Ext2Filesystem> CreateFromFile(
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const std::string& filename);
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virtual ~Ext2Filesystem();
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// FilesystemInterface overrides.
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size_t GetBlockSize() const override;
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size_t GetBlockCount() const override;
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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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bool GetFiles(std::vector<File>* files) const override;
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bool LoadSettings(brillo::KeyValueStore* store) const override;
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private:
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Ext2Filesystem() = default;
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// The ext2 main data structure holding the filesystem.
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ext2_filsys filsys_ = nullptr;
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// The file where the filesystem is stored.
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std::string filename_;
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DISALLOW_COPY_AND_ASSIGN(Ext2Filesystem);
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};
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_EXT2_FILESYSTEM_H_
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