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https://github.com/RGBCube/serenity
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44673c4f3b
This way you can spam small write()s on a file without the kernel writing to disk every single time. Flushes are included in the FS::sync() operation and will get triggered regularly by syncd. :^)
33 lines
821 B
C++
33 lines
821 B
C++
#pragma once
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#include "FileSystem.h"
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#include <AK/ByteBuffer.h>
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class DiskBackedFS : public FS {
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public:
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virtual ~DiskBackedFS() 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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int block_size() const { return m_block_size; }
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virtual void flush_writes() override;
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protected:
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explicit DiskBackedFS(Retained<DiskDevice>&&);
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void set_block_size(unsigned);
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ByteBuffer read_block(unsigned index) const;
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ByteBuffer read_blocks(unsigned index, unsigned count) const;
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bool write_block(unsigned index, const ByteBuffer&);
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bool write_blocks(unsigned index, unsigned count, const ByteBuffer&);
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private:
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int m_block_size { 0 };
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Retained<DiskDevice> m_device;
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HashMap<unsigned, ByteBuffer> m_write_cache;
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};
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