- fix panic on truncating files with holes; - remove block-based readahead, to match MFS. Change-Id: I385552f8019e9c013a6cb937bcc8e4e7181a4a50
Change-Id: Ibc5034617e6f6581de7c4a166ca075b3c357fa82
Change-Id: Ic716f336b7071063997cf5b4dae6d50e0b4631e9