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Some of the callers already have the address_space and can avoid calling folio_mapping() and checking if the folio was already truncated. Also add kernel-doc and fix the return type (in case we ever support folios larger than 4TB). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>