tree 6195edbc8abb6645d39a4986fd2d48c89bbefa92
parent f63674fd0d6afa1ba24309aee1f8c60195d39041
author Tejun Heo <tj@kernel.org> 1371233902 -0700
committer Tejun Heo <tj@kernel.org> 1371568463 -0700

cgroup: disallow rename(2) if sane_behavior

cgroup's rename(2) isn't a proper migration implementation - it can't
move the cgroup to a different parent in the hierarchy.  All it can do
is swapping the name string for that cgroup.  This isn't useful and
can mislead users to think that cgroup supports proper cgroup-level
migration.  Disallow rename(2) if sane_behavior.

v2: Fail with -EPERM instead of -EINVAL so that it matches the vfs
    return value when ->rename is not implemented as suggested by Li.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>