xfs: updates for 4.9-rc3 Changes in this update: o iomap page offset masking fix for page faults o add IOMAP_REPORT to distinguish between read and fiemap map requests o cleanups to new shared data extent code o fix mount active status on failed log recovery o fix broken dquots in a buffer calculation o fix locking order issues and merge xfs_reflink_remap_range and xfs_file_share_range o rework unmapping of CoW extents and remove now unused functions o clean state when CoW is done.