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

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Message-ID: <CAFLxGvxNHGEOrj6nKTtDeiU+Rx4xv_6asjSQYcFWXhk5m=1cBA@mail.gmail.com>
Date:   Mon, 20 Jul 2020 13:58:22 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     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

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

-- 
Thanks,
//richard