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dm thin: grab a virtual cell before looking up the mapping
Joe Thornber authored
commit c822ed96

 upstream.

Avoids normal IO racing with discard.
Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
5f64b0f2
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