linux-kernel - Re: [RESEND,v5,1/2] bio: limit bio max size

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Date:   Fri, 9 Apr 2021 07:47:23 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Damien Le Moal <Damien.LeMoal@....com>,
        Changheun Lee <nanich.lee@...sung.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Cc:     Johannes Thumshirn <Johannes.Thumshirn@....com>,
        "asml.silence@...il.com" <asml.silence@...il.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "hch@...radead.org" <hch@...radead.org>,
        "jisoo2146.oh@...sung.com" <jisoo2146.oh@...sung.com>,
        "junho89.kim@...sung.com" <junho89.kim@...sung.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ming.lei@...hat.com" <ming.lei@...hat.com>,
        "mj0123.lee@...sung.com" <mj0123.lee@...sung.com>,
        "osandov@...com" <osandov@...com>,
        "patchwork-bot@...nel.org" <patchwork-bot@...nel.org>,
        "seunghwan.hyun@...sung.com" <seunghwan.hyun@...sung.com>,
        "sookwan7.kim@...sung.com" <sookwan7.kim@...sung.com>,
        "tj@...nel.org" <tj@...nel.org>,
        "tom.leiming@...il.com" <tom.leiming@...il.com>,
        "woosung2.lee@...sung.com" <woosung2.lee@...sung.com>,
        "yt0928.kim@...sung.com" <yt0928.kim@...sung.com>
Subject: Re: [RESEND,v5,1/2] bio: limit bio max size

On 4/7/21 3:27 AM, Damien Le Moal wrote:
> On 2021/04/07 18:46, Changheun Lee wrote:
>> I'll prepare new patch as you recommand. It will be added setting of
>> limit_bio_size automatically when queue max sectors is determined.
> 
> Please do that in the driver for the HW that benefits from it. Do not do this
> for all block devices.

Hmm ... is it ever useful to build a bio with a size that exceeds 
max_hw_sectors when submitting a bio directly to a block device, or in 
other words, if no stacked block driver sits between the submitter and 
the block device? Am I perhaps missing something?

Thanks,

Bart.