linux-kernel - Re: [RFC PATCH 1/7] block: Support creating a struct file from a block device

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Message-ID: <Y9d692WEX/ZvBhXI@infradead.org>
Date:   Mon, 30 Jan 2023 00:08:23 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Demi Marie Obenour <demi@...isiblethingslab.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/7] block: Support creating a struct file from a
 block device

On Wed, Jan 25, 2023 at 10:33:53PM -0500, Demi Marie Obenour wrote:
> The newly added blkdev_get_file() function allows kernel code to create
> a struct file for any block device.  The main use-case is for the
> struct file to be exposed to userspace as a file descriptor.  A future
> patch will modify the DM_DEV_CREATE_CREATE ioctl to allow userspace to
> get a file descriptor to the newly created block device, avoiding nasty
> race conditions.

NAK.  Do not add wierd side-way interfaces to the block layer.