linux-kernel - Re: [PATCH v12 1/3] bio: control bio max size

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Message-ID: <YL2+HeyKVMHsLNe2@infradead.org>
Date:   Mon, 7 Jun 2021 07:35:09 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Changheun Lee <nanich.lee@...sung.com>, damien.lemoal@....com,
        Avri.Altman@....com, Johannes.Thumshirn@....com,
        alex_y_xu@...oo.ca, alim.akhtar@...sung.com,
        asml.silence@...il.com, axboe@...nel.dk, bgoncalv@...hat.com,
        cang@...eaurora.org, gregkh@...uxfoundation.org, hch@...radead.org,
        jaegeuk@...nel.org, jejb@...ux.ibm.com, jisoo2146.oh@...sung.com,
        junho89.kim@...sung.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        martin.petersen@...cle.com, ming.lei@...hat.com,
        mj0123.lee@...sung.com, osandov@...com, patchwork-bot@...nel.org,
        seunghwan.hyun@...sung.com, sookwan7.kim@...sung.com,
        tj@...nel.org, tom.leiming@...il.com, woosung2.lee@...sung.com,
        yi.zhang@...hat.com, yt0928.kim@...sung.com
Subject: Re: [PATCH v12 1/3] bio: control bio max size

On Fri, Jun 04, 2021 at 07:52:35AM -0700, Bart Van Assche wrote:
>  Damien is right. bd_disk can be NULL. From

bd_disk is initialized in bdev_alloc, so it should never be NULL.
bi_bdev OTOH is only set afer bio_add_page in various places or not at
all in case of passthrough bios.  Which is a bit of a mess and I have
plans to fix it.