[$] Extending statx()

When Andreas Dilger proposed the statx() topic for the 2017 LinuxStorage, Filesystem, and Memory-Management Summit, the system call hadstill not been merged. But that all changed in the 4.11 development cycle when Al Viro merged thesystem call to provide additional file information. So, unlikeprevious years, the discussion was not about how to merge such a system call but,instead, how to extend statx() for additional file information.