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https://github.com/RGBCube/serenity
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59ed235c85
Files opened with O_DIRECT will now bypass the disk cache in read/write operations (though metadata operations will still hit the disk cache.) This will allow us to test actual disk performance instead of testing disk *cache* performance, if that's what we want. :^) There's room for improvment here, we're very aggressively flushing any dirty cache entries for the specific block before reading/writing that block. This is done by walking the entire cache, which may be slow.
36 lines
1,015 B
C++
36 lines
1,015 B
C++
#pragma once
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#include "FileSystem.h"
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#include <AK/ByteBuffer.h>
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class DiskCache;
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class DiskBackedFS : public FS {
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public:
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virtual ~DiskBackedFS() override;
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virtual bool is_disk_backed() const override { return true; }
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DiskDevice& device() { return *m_device; }
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const DiskDevice& device() const { return *m_device; }
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virtual void flush_writes() override;
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void flush_writes_impl();
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protected:
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explicit DiskBackedFS(NonnullRefPtr<DiskDevice>&&);
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bool read_block(unsigned index, u8* buffer, FileDescription* = nullptr) const;
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bool read_blocks(unsigned index, unsigned count, u8* buffer, FileDescription* = nullptr) const;
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bool write_block(unsigned index, const u8*, FileDescription* = nullptr);
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bool write_blocks(unsigned index, unsigned count, const u8*, FileDescription* = nullptr);
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private:
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DiskCache& cache() const;
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void flush_specific_block_if_needed(unsigned index);
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NonnullRefPtr<DiskDevice> m_device;
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mutable OwnPtr<DiskCache> m_cache;
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};
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