mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 07:38:10 +00:00
a61f6ccc27
The hashmap cache was ridiculously slow and hurt us more than it helped us. This patch replaces it with a flat memory cache that keeps up to 10'000 blocks in cache with a simple dirty bit. The syncd task will wake up periodically and call flush_writes() on all file systems, which now causes us to traverse the cache and write all dirty blocks to disk. There's a ton of room for improvement here, but this itself is already drastically better when doing repeated GCC invocations.
33 lines
819 B
C++
33 lines
819 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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protected:
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explicit DiskBackedFS(NonnullRefPtr<DiskDevice>&&);
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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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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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