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Commit e522c039 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm: cleanup dm_any_congested() 



The request-based DM support for checking queue congestion doesn't
require access to the live DM table.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent ae6ad75e

drivers/md/dm.c

+8 −9
Original line number Diff line number Diff line
@@ -2137,20 +2137,19 @@ static int dm_any_congested(void *congested_data, int bdi_bits) 
	struct dm_table *map;



	if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {

		map = dm_get_live_table_fast(md);

		if (map) {

		if (dm_request_based(md)) {

			/*

			 * Request-based dm cares about only own queue for

			 * the query about congestion status of request_queue

			 * With request-based DM we only need to check the

			 * top-level queue for congestion.

			 */

			if (dm_request_based(md))

				r = md->queue->backing_dev_info.wb.state &

				    bdi_bits;

			else

			r = md->queue->backing_dev_info.wb.state & bdi_bits;

		} else {

			map = dm_get_live_table_fast(md);

			if (map)

				r = dm_table_any_congested(map, bdi_bits);

		}

			dm_put_live_table_fast(md);

		}

	}



	return r;

}