ExtentBlockTail
ExtentBlockTail*
return (ExtentBlockTail*)
(fBlockBuffer + fInode->DirBlockSize() - sizeof(ExtentBlockTail));
Extent::BlockFirstLeaf(ExtentBlockTail* tail)
ExtentBlockTail* blockTail = BlockTail();
ExtentBlockTail* BlockTail();
ExtentLeafEntry* BlockFirstLeaf(ExtentBlockTail* tail);