Btrfs: Set real mirror number for read operation on RAID0/5/6
We need real mirror number for RAID0/5/6 when reading data, or if read error happens, we would pass 0 as the number of the mirror on which the io error happens. It is wrong and would cause the filesystem read the data from the corrupted mirror again. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
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