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block: Adjust elv_iosched_show to return "none" for bio-based DM 

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@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Mike Snitzer 2010-05-24 09:07:32 +02:00 committed by Jens Axboe
parent 80b15c7389
commit e36f724b4a
1 changed files with 1 additions and 1 deletions
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2
block/elevator.c
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@ -1097,7 +1097,7 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
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;