linux-kernel - Re: [PATCH 04/14] bdi: initialize ->ra_pages in bdi

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Message-ID: <20200720120734.GA29061@lst.de>
Date:   Mon, 20 Jul 2020 14:07:34 +0200
From:   Christoph Hellwig <hch@....de>
To:     Richard Weinberger <richard.weinberger@...il.com>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Song Liu <song@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org,
        device-mapper development <dm-devel@...hat.com>,
        linux-block@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        drbd-dev@...ts.linbit.com, linux-raid@...r.kernel.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-mm@...ck.org, cgroups mailinglist <cgroups@...r.kernel.org>
Subject: Re: [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init

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@....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?