Why fput is SMP safe?

[Haoqiang Zheng <hzheng@cs.columbia.edu>]

I don't understand why fput is SMP safe. It calls atomic_dec_and_test(), if 
the return value is true, it then directly goes to the clean up section. 
But after atomic_dec_and_test() (and before the clean up is done), another 
process can still call fget(). I mean, I doesn't see fput acquire any lock 
that can prevent fget be executed. Where I am wrong?

--
Haoqiang Zheng
Columbia University
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