_BlocksNeeded
fWaiting = _BlocksNeeded(numBlocks);
numBlocks = _BlocksNeeded(oldNumBlocks);
numBlocks = _BlocksNeeded(oldNumBlocks);
numBlocks = _BlocksNeeded(oldNumBlocks);
numBlocks = _BlocksNeeded(oldNumBlocks);
uint32 _BlocksNeeded(off_t end);