On Wed, Jan 26, 2022 at 05:59:08PM +0800, Ming Lei wrote: > nvme just sets part0 to rq->bio, which is fine since nvme doesn't > support partial completion. > > The simplest way could be to assign bio->bi_bdev with q->disk->part0 in both > bio_copy_user_iov() and bio_map_user_iov(), which should cover most of cases. > Given user io is always on device instead of partition even though the > command is sent via partition bdev. This would be easiest, but it would also assign them when called from the SG driver. And that means these I/Os could be in flight when detaching a SCSI ULP. At least without the freeze in del_gendisk (or the local one in case of the sd driver).
