On Fri, Jan 17, 2025 at 12:21:12PM -0800, Darrick J. Wong wrote: > > Full disclosure - I have an out of tree xfs patch that implements > > ioctls XFS_IOC_[GS]ETDOSATTRAT and stashes these > > attributes in the unused di_dmevmask space. > > [cc linux-xfs] > > Urrrrk, please don't fork the xfs ondisk format! Yeah, adding your own bits to any file system on-disk format is a huge no-go.