xfs: Changes for 4.6-rc1 Change summary: o error propagation for direct IO failures fixes for both XFS and ext4 o new quota interfaces and XFS implementation for iterating all the quota IDs in the filesystem o locking fixes for real-time device extent allocation o reduction of duplicate information in the xfs and vfs inode, saving roughly 100 bytes of memory per cached inode. o buffer flag cleanup o rework of the writepage code to use the generic write clustering mechanisms o several fixes for inode flag based DAX enablement o rework of remount option parsing o compile time verification of on-disk format structure sizes o delayed allocation reservation overrun fixes o lots of little error handling fixes o small memory leak fixes o enable xfsaild freezing again