[$] New tricks for XFS

The XFS filesystem has been in the kernel for fifteen years and was used inproduction on IRIX systems for five years before that. But it might justbe time to teach that "old dog" of a filesystem some new tricks, DaveChinner said, at the beginning of his linux.conf.au 2018 presentation.There are a number of features that XFS lacks when compared to more modernfilesystems, such as snapshots and subvolumes; but he has been thinking-andwriting code-on a path to get them into XFS.