[PATCH 4/5] block/bdev: enable large folio support for large logical block sizes

[Matthew Wilcox]

On Fri, May 10, 2024 at 12:29:05PM +0200, hare at kernel.org wrote:
> From: Hannes Reinecke <hare at suse.de>
> 
> Call mapping_set_folio_min_order() when modifying the logical block
> size to ensure folios are allocated with the correct size.

This makes me nervous.  It lets the pagecache allocate folios larger
than min_order (all the way up to PMD_ORDER).  Filesystems may not
cope well with seeing tail pages.

I'd _like_ to be able to do this.  But I think for now we need to
call mapping_set_folio_order_range(mapping, order, order);