[$] New APIs for filesystems

A discussion of extensions to the statx()system call comes up frequently at the Linux Storage,Filesystem, Memory Management, and BPF Summit; this year's edition wasno exception. Kent Overstreet led the first filesystem-only session at thesummit on querying information about filesystems that have subvolumes andsnapshots. While it was billed as a discussion on statx()additions, it ranged more widely over new APIs needed for modern filesystems.