bdev_max_active_zones
mar = bdev_max_active_zones(req->ns->bdev);
max_active_zones = min_not_zero(bdev_max_active_zones(bdev),
if (bdev_max_active_zones(bdev) == 0) {
sbi->s_max_active_seq_files = bdev_max_active_zones(sb->s_bdev);