63 lines
1.2 KiB
C++
63 lines
1.2 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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#include <Device/Device.h>
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class MappedFile;
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namespace Device {
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enum BlockReleaseFlags {
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kBlockDirty = 1,
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kBlockCommitNow = 2,
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kBlockReuse = 3
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};
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class BlockCache {
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public:
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static BlockCachePointer Create(BlockDevicePointer device);
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virtual ~BlockCache();
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bool readOnly() { return _readOnly; }
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unsigned blocks() { return _blocks; }
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BlockDevicePointer device() { return _device; }
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virtual void sync() = 0;
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virtual void write(unsigned block, const void *bp);
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virtual void read(unsigned block, void *bp);
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virtual void *acquire(unsigned block) = 0;
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virtual void release(unsigned block, int flags) = 0 ;
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virtual void markDirty(unsigned block) = 0;
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virtual void zeroBlock(unsigned block);
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void release(unsigned block) { release(block, 0); }
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void release(unsigned block, bool dirty)
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{
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release(block, dirty ? kBlockDirty : 0);
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}
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protected:
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BlockCache(BlockDevicePointer device);
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BlockDevicePointer _device;
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private:
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unsigned _blocks;
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bool _readOnly;
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};
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} // namespace
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#endif
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