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Commit bb086a89 authored by Shaohua Li's avatar Shaohua Li
Browse files

md: set rotational bit 



if all disks in an array are non-rotational, set the array
non-rotational.

This only works for array with all disks populated at startup. Support
for disk hotadd/hotremove could be added later if necessary.

Acked-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent 099b548c

drivers/md/md.c

+15 −0
Original line number Diff line number Diff line
@@ -5297,6 +5297,21 @@ int md_run(struct mddev *mddev) 
		return err;

	}

	if (mddev->queue) {

		bool nonrot = true;



		rdev_for_each(rdev, mddev) {

			if (rdev->raid_disk >= 0 &&

			    !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) {

				nonrot = false;

				break;

			}

		}

		if (mddev->degraded)

			nonrot = false;

		if (nonrot)

			queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mddev->queue);

		else

			queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, mddev->queue);

		mddev->queue->backing_dev_info.congested_data = mddev;

		mddev->queue->backing_dev_info.congested_fn = md_congested;

	}