error = radix_tree_insert(&mapping->page_tree, offset, page);
quoted text
>  		if (!error) {
>  			page_cache_get(page);

I don't think we want an unchecked trylock_page without a comment explaining
it.  I'd go as far as saying trylock_page should get a __must_check
attribute, and we'll need a dummy variable to actually ignore it.

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