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dm cache: only use overwrite optimisation for promotion when in writeback mode
authorJoe Thornber <ejt@redhat.com>
Thu, 27 Nov 2014 12:21:08 +0000 (12:21 +0000)
committerMike Snitzer <snitzer@redhat.com>
Mon, 1 Dec 2014 16:30:12 +0000 (11:30 -0500)
Overwrite causes the cache block and origin blocks to diverge, which
is only allowed in writeback mode.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org

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