linux-kernel - Re: [PATCH v4 2/2] s390/dasd: remove ioctl_by

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Date:   Wed, 7 Oct 2020 12:39:36 +0200
From:   Christoph Hellwig <hch@....de>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Stefan Haberland <sth@...ux.ibm.com>, hch@....de, axboe@...nel.dk,
        hoeppner@...ux.ibm.com, linux-s390@...r.kernel.org,
        heiko.carstens@...ibm.com, gor@...ux.ibm.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] s390/dasd: remove ioctl_by_bdev calls

On Wed, Oct 07, 2020 at 11:34:17AM +0200, Christian Borntraeger wrote:
> 
> On 19.05.20 16:22, Stefan Haberland wrote:
> > The IBM partition parser requires device type specific information only
> > available to the DASD driver to correctly register partitions. The
> > current approach of using ioctl_by_bdev with a fake user space pointer
> > is discouraged.
> > 
> > Fix this by replacing IOCTL calls with direct in-kernel function calls.
> > 
> > Suggested-by: Christoph Hellwig <hch@....de>
> > Signed-off-by: Stefan Haberland <sth@...ux.ibm.com>
> > Reviewed-by: Jan Hoeppner <hoeppner@...ux.ibm.com>
> > Reviewed-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
> 
> FWIW, this broken the ibm-partition code for virtio-blk, when CONFIG_DASD=m.

What are the symptoms?