Add a read_folio_range() handler for buffered writes that filesystems may pass in if they wish to provide a custom handler for synchronously reading in the contents of a folio. Signed-off-by: Joanne Koong <joannelkoong@gmail.com> [hch: renamed to read_folio_range, pass less arguments] Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/20250710133343.399917-14-hch@lst.de Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>