On Fri, Sep 15, 2023 at 02:32:44PM -0700, Luis Chamberlain wrote: > However, an issue is that disabling CONFIG_BUFFER_HEAD in practice is not viable > for many Linux distributions since it also means disabling support for most > filesystems other than btrfs and XFS. So we either support larger order folios > on buffer-heads, or we draw up a solution to enable co-existence. Since at LSFMM > 2023 it was decided we would not support larger order folios on buffer-heads, Um, I didn't agree to that. If block size is equal to folio size, there are no problems supporting one buffer head per folio. In fact, we could probably go up to 8 buffer heads per folio without any trouble (but I'm not signing up to do that work).