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    Btrfs: implement repair function when direct read fails · 8b110e39
    Miao Xie 提交于
    This patch implement data repair function when direct read fails.
    
    The detail of the implementation is:
    - When we find the data is not right, we try to read the data from the other
      mirror.
    - When the io on the mirror ends, we will insert the endio work into the
      dedicated btrfs workqueue, not common read endio workqueue, because the
      original endio work is still blocked in the btrfs endio workqueue, if we
      insert the endio work of the io on the mirror into that workqueue, deadlock
      would happen.
    - After we get right data, we write it back to the corrupted mirror.
    - And if the data on the new mirror is still corrupted, we will try next
      mirror until we read right data or all the mirrors are traversed.
    - After the above work, we set the uptodate flag according to the result.
    Signed-off-by: NMiao Xie <miaox@cn.fujitsu.com>
    Signed-off-by: NChris Mason <clm@fb.com>
    8b110e39
extent_io.c 135.8 KB