BLK_FEAT_ADD_RANDOM
QUEUE_SYSFS_FEATURE(add_random, BLK_FEAT_ADD_RANDOM)
if (q->limits.features & BLK_FEAT_ADD_RANDOM)
lim->features &= ~(BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM);
lim->features |= (BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM);