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md: set rotational bit

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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>
This commit is contained in:
Shaohua Li 2016-09-30 09:45:40 -07:00
parent 099b548c42
commit bb086a89a4
1 changed files with 15 additions and 0 deletions
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15
drivers/md/md.c
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@ -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;
}