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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: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Guoqing Jiang 2017-10-24 15:11:50 +08:00 committed by Shaohua Li
parent efa4b77b00
commit d4098c7262
1 changed files with 5 additions and 2 deletions
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7
drivers/md/raid10.c
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@ -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++) {