rbd: resurrect setting of disk->private_data in rbd_init_disk()
rbd_open() and rbd_release() expect that disk->private_data is set to rbd_dev. Otherwise we hit a NULL pointer dereference when mapping the image. URL: https://tracker.ceph.com/issues/51759 Fixes: 195b1956 ("rbd: use blk_mq_alloc_disk and blk_cleanup_disk") Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
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