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Date:   Mon, 7 Sep 2020 08:09:27 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Tom Yan <tom.ty89@gmail.com>
Cc:     linux-scsi@vger.kernel.org, dgilbert@interlog.com,
        bvanassche@acm.org, stern@rowland.harvard.edu,
        akinobu.mita@gmail.com, hch@lst.de, linux-api@vger.kernel.org
Subject: Re: [PATCH RESEND 2/4] scsi: sg: implement BLKSSZGET
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On Sun, Sep 06, 2020 at 09:27:14AM +0800, Tom Yan wrote:
> Provide an ioctl to get the logical sector size so that the maximum
> bytes per request can be derived.
> 
> Follow-up of the BLKSECTGET fix.

I don't think this has any business going in.  /dev/sg is a generic
interface that is not specific to block based command sets.  Just issue
your command set specific command to query the logical block size if
you care about it.