linux-kernel - Re: [PATCH v3 0/9] Add a new LOOP_SET_FD_AND

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Date:   Mon, 27 Apr 2020 19:06:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     Martijn Coenen <maco@...roid.com>
Cc:     axboe@...nel.dk, hch@....de, ming.lei@...hat.com,
        narayan@...gle.com, zezeozue@...gle.com, kernel-team@...roid.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        maco@...gle.com, bvanassche@....org, Chaitanya.Kulkarni@....com,
        jaegeuk@...nel.org
Subject: Re: [PATCH v3 0/9] Add a new LOOP_SET_FD_AND_STATUS ioctl

I've just been looking over the loop driver for other reasons,
and noticed that setting the block size still isn't possible
with LOOP_SET_FD_AND_STATUS as far as I can tell.  Might that
be worth it?  Also maybe an explicit direct I/O flag, and maybe
enough padding with a future proof flags bitmap that we can easily
extend it for new features if they pop up?