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Commit d4098c72 authored by Guoqing Jiang's avatar Guoqing Jiang Committed by Shaohua Li
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md-cluster/raid10: set "do_balance = 0" if area is resyncing 



Just like clustered raid1, it is impossible for cluster raid10
to choose the best device for read balance when the area of
array is resyncing. Because we cannot trust the data to be the
same on all devices at that time, so we choose just the first
one to use, so set do_balance to 0.

Signed-off-by: default avatarGuoqing Jiang <gqjiang@suse.com>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent efa4b77b

drivers/md/raid10.c

+5 −2
Original line number Diff line number Diff line
@@ -759,8 +759,11 @@ static struct md_rdev *read_balance(struct r10conf *conf, 
	 * the resync window. We take the first readable disk when

	 * above the resync window.

	 */

	if (conf->mddev->recovery_cp < MaxSector

	    && (this_sector + sectors >= conf->next_resync))

	if ((conf->mddev->recovery_cp < MaxSector

	     && (this_sector + sectors >= conf->next_resync)) ||

	    (mddev_is_clustered(conf->mddev) &&

	     md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector,

					    this_sector + sectors)))

		do_balance = 0;



	for (slot = 0; slot < conf->copies ; slot++) {