Re: [RFC PATCH] btrfs: defer freeing of subpage private state to free_folio

[Matthew Wilcox]

On Fri, Jan 30, 2026 at 01:46:59PM +1030, Qu Wenruo wrote:
> Another question is, why only two fses (nfs for dir inode, and orangefs) are
> utilizing the free_folio() callback.

Alas, secretmem and guest_memfd are also using it.  Nevertheless, I'm
not a fan of this interface existing, and would prefer to not introduce
new users.  Like launder_folio, which btrfs has also mistakenly used.