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Date: Mon, 20 Jul 2020 14:07:34 +0200
From: Christoph Hellwig <hch@lst.de>
To: Richard Weinberger <richard.weinberger@gmail.com>
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Cc: Jens Axboe <axboe@kernel.dk>, linux-raid@vger.kernel.org,
	Hans de Goede <hdegoede@redhat.com>, Richard Weinberger <richard@nod.at>,
	LKML <linux-kernel@vger.kernel.org>, linux-block@vger.kernel.org,
	Song Liu <song@kernel.org>,
	device-mapper development <dm-devel@redhat.com>,
	linux-mtd@lists.infradead.org, linux-mm@kvack.org,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	cgroups mailinglist <cgroups@vger.kernel.org>,
	Christoph Hellwig <hch@lst.de>, drbd-dev@lists.linbit.com
Subject: Re: [Drbd-dev] [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init
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On Mon, Jul 20, 2020 at 01:58:22PM +0200, Richard Weinberger wrote:
> Hello Chrstoph,
> 
> On Mon, Jul 20, 2020 at 9:53 AM Christoph Hellwig <hch@lst.de> wrote:
> >
> > Set up a readahead size by default.  This changes behavior for mtd,
> > ubifs, and vboxsf to actually enabled readahead, the lack of which
> > very much looks like an oversight.
> 
> UBIFS doesn't enable readahead on purpose, please see:
> http://www.linux-mtd.infradead.org/doc/ubifs.html#L_readahead

What about jffs2 and blk2mtd raw block devices?