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Prepare for supporting unprivileged ublk device by limiting max number ublk devices added. Otherwise too many ublk devices could be added by un-trusted user, which can be thought as one DoS. Reviewed-by: ZiyangZhang <ZiyangZhang@linux.alibaba.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20230106041711.914434-6-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>