Now reading the data from the target device of the replace operation is allowed,
so the mirror number that is greater than the stripes number of a chunk is 
valid,
we will tune it when we find there is no target device later. Fix it.

Signed-off-by: Miao Xie <mi...@cn.fujitsu.com>
---
 fs/btrfs/volumes.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c58bf19..7789598 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4420,9 +4420,6 @@ static int __btrfs_map_block(struct btrfs_fs_info 
*fs_info, int rw,
        map = (struct map_lookup *)em->bdev;
        offset = logical - em->start;
 
-       if (mirror_num > map->num_stripes)
-               mirror_num = 0;
-
        stripe_len = map->stripe_len;
        stripe_nr = offset;
        /*
-- 
1.8.1.4

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