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fdc782c1d1
This would be a lot better as an LRU. Right now it's a 32-slot hash table with random eviction.
32 lines
872 B
C++
32 lines
872 B
C++
#pragma once
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#include "FileSystem.h"
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#include <AK/ByteBuffer.h>
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#include <AK/HashMap.h>
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class DiskBackedFileSystem : public FileSystem {
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public:
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virtual ~DiskBackedFileSystem() override;
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DiskDevice& device() { return *m_device; }
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const DiskDevice& device() const { return *m_device; }
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unsigned blockSize() const { return m_blockSize; }
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protected:
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explicit DiskBackedFileSystem(RetainPtr<DiskDevice>&&);
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void setBlockSize(unsigned);
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void invalidateCaches();
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ByteBuffer readBlock(unsigned index) const;
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ByteBuffer readBlocks(unsigned index, unsigned count) const;
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bool writeBlock(unsigned index, const ByteBuffer&);
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bool writeBlocks(unsigned index, unsigned count, const ByteBuffer&);
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private:
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unsigned m_blockSize { 0 };
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RetainPtr<DiskDevice> m_device;
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mutable HashMap<unsigned, ByteBuffer> m_blockCache;
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};
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