Commit e36f724b authored May 24, 2010 by Mike Snitzer Committed by Jens Axboe May 24, 2010

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>

parent 80b15c73

block/elevator.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;

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