82 lines
1.4 KiB
C++
82 lines
1.4 KiB
C++
#ifndef __BLOCK_CACHE_H__
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#define __BLOCK_CACHE__
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#include <stdint.h>
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#include <vector>
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#include <list>
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//#include <ext/hash_map>
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//typedef std::__gnu_cxx::hash_map hash_map;
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namespace ProFUSE {
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class BlockCache {
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public:
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virtual ~BlockCache();
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virtual uint8_t *acquire(unsigned block) = 0;
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virtual void release(unsigned block, bool dirty = false) = 0;
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virtual void markDirty(unsigned block) = 0;
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virtual void sync() = 0;
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};
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class FileBlockCache : public BlockCache {
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FileBlockCache(Device *);
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virtual ~FileBlockCache();
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virtual uint8_t *acquire(unsigned block);
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virtual void release(unsigned block, bool dirty = false);
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virtual void markDirty(unsigned block);
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virtual void sync();
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private:
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struct Entry;
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enum { HashEntries = 23 };
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unsigned hashFunction(unsigned);
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void removeEntry(Entry *);
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Entry *findEntry(unsigned block);
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void sync(Entry *);
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std::vector<Entry *> _pages;
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std::list<Entry *> _unused;
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Entry *_hashMap[HashEntries];
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Device *_device;
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};
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class MappedBlockCache : public BlockCache
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{
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public:
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MappedBlockCache(Device *);
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virtual ~MappedBlockCache();
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virtual uint8_t *acquire(unsigned block);
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virtual void release(unsigned block, bool dirty = false);
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virtual void markDirty(unsigned block);
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virtual void sync();
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private:
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Device *_device;
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};
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}
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#endif
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