UPSTREAM: filemap: add helper mapping_max_folio_size()

Add mapping_max_folio_size() to get the maximum folio size for this
pagecache mapping.

Fixes: 5d8edfb9 ("iomap: Copy larger chunks from userspace")
Cc: stable@vger.kernel.org
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240521114939.2541461-1-xu.yang_2@nxp.com


Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Bug: 346830810
(cherry picked from commit 79c13745)
Change-Id: I43205a2b8ac6f6e3af8a39c052c75cf7a7f96529
Signed-off-by: Zhipeng Wang <zhipeng.wang_1@nxp.com>