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https://github.com/RGBCube/serenity
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dcf8d359f3
We can't be calling the virtual FS::flush_writes() in order to flush the disk cache from within the disk cache, since an FS subclass may try to do cache stuff in its flush_writes() implementation. Instead, separate out the implementation of DiskBackedFS's flushing logic into a flush_writes_impl() and call that from the cache code.
35 lines
846 B
C++
35 lines
846 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) const;
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bool read_blocks(unsigned index, unsigned count, u8* buffer) const;
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bool write_block(unsigned index, const u8*);
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bool write_blocks(unsigned index, unsigned count, const u8*);
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private:
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DiskCache& cache() const;
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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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