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dm writecache: fix writing beyond end of underlying device when shrin…
…king commit 4134455 upstream. Do not attempt to write any data beyond the end of the underlying data device while shrinking it. The DM writecache device must be suspended when the underlying data device is shrunk. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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