rem: void Unset() { if (fBlock != NULL) release_block(fVolume->Device(), fBlockNumber); }
add: CachedBlock::Unset() { if (fBlock != NULL) release_block(fVolume->Device(), fBlockNumber); }
context: 		void Unset()		{			if (fBlock != NULL)				release_block(fVolume->Device(), fBlockNumber);		}