Bio-based DM doesn't use an elevator (queue is !blk_queue_stackable()). Longer-term DM will not allocate an elevator for bio-based DM. But even then there will be small potential for an elevator to be allocated for a request-based DM table only to have a bio-based table be loaded in the end. Displaying "none" for bio-based DM will help avoid user confusion. Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx> Cc: Jens Axboe <jens.axboe@xxxxxxxxxx> --- block/elevator.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: linux-2.6-block/block/elevator.c =================================================================== --- linux-2.6-block.orig/block/elevator.c +++ linux-2.6-block/block/elevator.c @@ -1097,7 +1097,7 @@ ssize_t elv_iosched_show(struct request_ struct elevator_type *__e; int len = 0; - if (!q->elevator) + if (!q->elevator || !blk_queue_stackable(q)) return sprintf(name, "none\n"); elv = e->elevator_type; -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
