dm_call_pr
ret = dm_call_pr(bdev, __dm_pr_register, &pr);
(void) dm_call_pr(bdev, __dm_pr_register, &pr);
ret = dm_call_pr(bdev, __dm_pr_reserve, &pr);
ret = dm_call_pr(bdev, __dm_pr_release, &pr);
ret = dm_call_pr(bdev, __dm_pr_preempt, &pr);
ret = dm_call_pr(bdev, __dm_pr_read_keys, &pr);
ret = dm_call_pr(bdev, __dm_pr_read_reservation, &pr);