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Kent Overstreet committed a09ded8edf9
bcache: Fix merge_bvec_fn usage for when it modifies the bvm Stacked md devices reuse the bvm for the subordinate device, causing problems... Reported-by: Michael Balser <michael.balser@profitbricks.com> Signed-off-by: Kent Overstreet <koverstreet@google.com>