md-cluster/raid10: set "do_balance = 0" if area is resyncing (d4098c72) · Commits · 戴 / test

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:

Guoqing Jiang <gqjiang@suse.com> Signed-off-by:

Shaohua Li <shli@fb.com>

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++) {

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