thor Yan, Zheng <zheng.yan@oracle.com> 1274887230 -0400
committer Chris Mason <chris.mason@oracle.com> 1274924133 -0400

Btrfs: Fix block generation verification race

After the path is released, the generation number got from block
pointer is no long valid. The race may cause disk corruption, because
verify_parent_transid() calls clear_extent_buffer_uptodate() when
generation numbers mismatch.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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