Btrfs: fix raid10 reading math

The btrfs-progs raid10 code has been silently reading the wrong
raid10 block forever.  We didn't notice because it was always fixed
up by the retry code.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/volumes.c b/volumes.c
index 03bfb8cc..4c29cefd 100644
--- a/volumes.c
+++ b/volumes.c
@@ -1170,8 +1170,6 @@ again:
 			multi->num_stripes = map->sub_stripes;
 		else if (mirror_num)
 			stripe_index += mirror_num - 1;
-		else
-			stripe_index = stripe_nr % map->sub_stripes;
 
 		stripe_nr = stripe_nr / factor;
 	} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {