linux-kernel - Re: [PATCH 15/24] compat_ioctl: scsi: move ioctl handling into drivers

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Date:   Wed, 11 Dec 2019 18:05:07 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jens Axboe <axboe@...nel.dk>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jason Wang <jasowang@...hat.com>,
        Doug Gilbert <dgilbert@...erlog.com>,
        Kai Mäkisara <Kai.Makisara@...umbus.fi>,
        linux-kernel@...r.kernel.org, y2038@...ts.linaro.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Bart Van Assche <bvanassche@....org>,
        Hannes Reinecke <hare@...e.com>,
        Damien Le Moal <damien.lemoal@....com>,
        John Garry <john.garry@...wei.com>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 15/24] compat_ioctl: scsi: move ioctl handling into
 drivers

On Wed, Dec 11, 2019 at 09:42:49PM +0100, Arnd Bergmann wrote:
> Each driver calling scsi_ioctl() gets an equivalent compat_ioctl()
> handler that implements the same commands by calling scsi_compat_ioctl().
> 
> The scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible
> at this point, so any driver that calls those can do so for both native
> and compat mode, with the argument passed through compat_ptr().
> 
> With this, we can remove the entries from fs/compat_ioctl.c.  The new
> code is larger, but should be easier to maintain and keep updated with
> newly added commands.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/block/virtio_blk.c |   3 +
>  drivers/scsi/ch.c          |   9 ++-
>  drivers/scsi/sd.c          |  50 ++++++--------
>  drivers/scsi/sg.c          |  44 ++++++++-----
>  drivers/scsi/sr.c          |  57 ++++++++++++++--
>  drivers/scsi/st.c          |  51 ++++++++------
>  fs/compat_ioctl.c          | 132 +------------------------------------
>  7 files changed, 142 insertions(+), 204 deletions(-)
> 
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index 7ffd719d89de..fbbf18ac1d5d 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
>  
>  static const struct block_device_operations virtblk_fops = {
>  	.ioctl  = virtblk_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl = blkdev_compat_ptr_ioctl,
> +#endif
>  	.owner  = THIS_MODULE,
>  	.getgeo = virtblk_getgeo,
>  };

Hmm - is virtio blk lumped in with scsi things intentionally?

-- 
MST