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: Tejun Heo <tj@kernel.org>
Signed-off-by: Shaohua Li <shli@fb.com>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 457b538..eac84d8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5297,6 +5297,21 @@
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;
}