Pull user namespace update from Eric Biederman:
"The only change that is production ready this round is the work to
increase the number of uid and gid mappings a user namespace can
support from 5 to 340.
This code was carefully benchmarked and it was confirmed that in the
existing cases the performance remains the same. In the worst case
with 340 mappings an cache cold stat times go from 158ns to 248ns.
That is noticable but still quite small, and only the people who are
doing crazy things pay the cost.
This work uncovered some documentation and cleanup opportunities in
the mapping code, and patches to make those cleanups and improve the
documentation will be coming in the next merge window"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
userns: Simplify insert_extent
userns: Make map_id_down a wrapper for map_id_range_down
userns: Don't read extents twice in m_start
userns: Simplify the user and group mapping functions
userns: Don't special case a count of 0
userns: bump idmap limits to 340
userns: use union in {g,u}idmap struct
758f875848