"All" in this sentence is used in an idiomatic way, so it has no strict grammatical interpretation. Some other examples of this kind of usage are: That's all I wanted. All's well here.
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AnonymousI am confused about what the words 'All I wanted' are in grammar roles. Is this a phrase?all I wanted = all that I wanted ~ the only thing that I wanted (this, and no more than this)
Anonymous