tree f4cd581ee037732a736b70e1fffa220e012be512
parent e34a98d5b226b84a3ed6da93e7a92e65cc1c81ba
author Al Viro <viro@zeniv.linux.org.uk> 1547709951 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1551342572 -0500

cgroup: stash cgroup_root reference into cgroup_fs_context

Note that this reference is *NOT* contributing to refcount of
cgroup_root in question and is valid only until cgroup_do_mount()
returns.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>