linux-kernel - stop using ioctl_by_bdev in the s390 DASD driver

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Date:   Tue, 21 Apr 2020 08:12:23 +0200
From:   Christoph Hellwig <hch@....de>
To:     Stefan Haberland <sth@...ux.ibm.com>,
        Jan Hoeppner <hoeppner@...ux.ibm.com>,
        Jens Axboe <axboe@...nel.dk>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: stop using ioctl_by_bdev in the s390 DASD driver

Hi Jens and DASD maintainers,

can you take a look at this series, which stops the DASD driver from
issuing ioctls from kernel space, in preparation of removing
ioctl_by_bdev.  I don't really like the new s390-only method, but short
of forcing the dasd driver to be built into the kernel I can't think of
anything better.  But maybe the s390 maintainers are fine with forcing
the DASD driver to be built in, in which case we could go down that
route?