From mboxrd@z Thu Jan  1 00:00:00 1970
From: Artem Bityutskiy <dedekind1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init
Date: Mon, 20 Jul 2020 15:37:10 +0300
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On Mon, 2020-07-20 at 14:07 +0200, Christoph Hellwig wrote:
> What about jffs2 and blk2mtd raw block devices?

If my memory serves me correctly JFFS2 did not mind readahead.