b9ccad2e Fri Feb 11 22:39:03 CST 2022 Matthew Wilcox (Oracle) <willy@infradead.org> splice: Use a folio in page_cache_pipe_buf_try_steal()
This saves a lot of calls to compound_head().
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>