cgroup: cgroup_rm_files() was calling simple_unlink() with the wrong inode
While refactoring cgroup file removal path, 05ef1d7c "cgroup: introduce struct cfent" incorrectly changed the @dir argument of simple_unlink() to the inode of the file being deleted instead of that of the containing directory. The effect of this bug is minor - ctime and mtime of the parent weren't properly updated on file deletion. Fix it by using @cgrp->dentry->d_inode instead. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Acked-by: Li Zefan <lizefan@huawei.com> Cc: stable@vger.kernel.org
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