[PATCH 1/4] md-cluster/raid10: set "do_balance = 0" if area is resyncing
From: Guoqing Jiang <hidden>
Date: 2017-10-24 07:11:50
Subsystem:
software raid (multiple disks) support, the rest · Maintainers:
Song Liu, Yu Kuai, Linus Torvalds
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 <redacted> --- drivers/md/raid10.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 615f677ceb1a..61890231972e 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c@@ -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++) {
--
2.10.0