On Fri, Jan 25, 2013 at 03:09:59PM +0800, Li Zefan wrote:

rename() will change dentry->d_name. The result of this race can
be worse than seeing partially rewritten name, but we might access
a stale pointer because rename() will re-allocate memory to hold
a longer name.

Use dentry_path_raw(), and this vfs API will take care of lockings.

Signed-off-by: Li Zefan <redacted>

Urgh... why do we even support rename?  :(

Applying to cgroup/for-3.8-fixes w/ stable cc'd.

Thanks.

-- 
tejun