dasd: implement ->set_read_only to hook into BLKROSET processing
Implement the ->set_read_only method instead of parsing the actual ioctl command. Signed-off-by:Christoph Hellwig <hch@lst.de> Reviewed-by:
Stefan Haberland <sth@linux.ibm.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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