qed: protect table cache with CoMutex
This makes the driver thread-safe. The CoMutex is dropped temporarily while accessing the data clusters or the backing file. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Message-Id: <20170629132749.997-10-pbonzini@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com>
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