73 lines
1.3 KiB
C++
73 lines
1.3 KiB
C++
#ifndef __BLOCKCACHE_H__
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#define __BLOCKCACHE_H__
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#include <stdint.h>
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#include <vector>
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namespace ProFUSE {
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class BlockDevice;
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class AbstractBlockCache {
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public:
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virtual ~AbstractBlockCache();
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virtual void write() = 0;
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virtual void *load(unsigned block) = 0;
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virtual void unload(unsigned block, bool dirty) = 0;
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void unload(unsigned block) { unload(block, false); }
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};
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class BlockCache : public AbstractBlockCache {
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public:
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BlockCache(BlockDevice *device, unsigned size = 16);
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~BlockCache();
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virtual void write();
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virtual void *load(unsigned block);
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virtual void unload(unsigned block, bool dirty);
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private:
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struct BlockDescriptor {
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unsigned block;
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unsigned count;
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unsigned ts;
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bool dirty;
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uint8_t *data;
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};
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std::vector<BlockDescriptor> _blocks;
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BlockDevice *_device;
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unsigned _ts;
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unsigned _cacheSize;
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};
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class MappedBlockCache : public AbstractBlockCache {
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public:
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MappedBlockCache(void *data, unsigned blocks);
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virtual void write();
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virtual void *load(unsigned block);
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virtual void unload(unsigned block, bool dirty);
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private:
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unsigned _blocks;
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uint8_t * _data;
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};
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} // namespace
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#endif |