78 lines
1.4 KiB
C++
78 lines
1.4 KiB
C++
#ifndef __CONCRETE_BLOCK_CACHE_H__
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#define __CONCRETE_BLOCK_CACHE_H__
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#include <vector>
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#include <Cache/BlockCache.h>
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namespace Device {
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class ConcreteBlockCache : public BlockCache {
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public:
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static BlockCachePointer Create(BlockDevicePointer device, unsigned size = 16);
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virtual ~ConcreteBlockCache();
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virtual void sync();
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virtual void write(unsigned block, const void *vp);
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virtual void *acquire(unsigned block);
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virtual void release(unsigned block, int flags);
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virtual void markDirty(unsigned block);
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// public so make_shared can access it.
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ConcreteBlockCache(BlockDevicePointer device, unsigned size);
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private:
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struct Entry {
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unsigned block;
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unsigned count;
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bool dirty;
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struct Entry *next;
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struct Entry *prev;
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struct Entry *nextHash;
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uint8_t buffer[512];
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};
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typedef std::vector<Entry *>::iterator EntryIter;
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enum { HashTableSize = 23 };
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std::vector<Entry *>_buffers;
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Entry *_hashTable[HashTableSize];
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Entry *_first;
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Entry *_last;
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unsigned hashFunction(unsigned block);
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Entry *findEntry(unsigned block);
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void removeEntry(unsigned block);
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void addEntry(Entry *);
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Entry *newEntry(unsigned block);
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void pushEntry(Entry *);
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void setLast(Entry *);
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void setFirst(Entry *);
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void incrementCount(Entry *);
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void decrementCount(Entry *);
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};
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}
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#endif
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