xfs: update for 3.17-rc1 This update contains: o conversion of the XFS core to pass negative error numbers o restructing of core XFS code that is shared with userspace to fs/xfs/libxfs o introduction of sysfs interface for XFS o bulkstat refactoring o demand driven speculative preallocation removal o XFS now always requires 64 bit sectors to be configured o metadata verifier changes to ensure CRCs are calculated during log recovery o various minor code cleanups o miscellaneous bug fixes