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H A Dblock.cdiff d6fcdf06d9fc7d72151cc2069dc5c1adf5c21707 Fri Apr 07 15:55:27 CDT 2017 Jeff Cody <jcody@redhat.com> block: honor BDRV_O_ALLOW_RDWR when clearing bs->read_only

The BDRV_O_ALLOW_RDWR flag allows / prohibits the changing of
the BDS 'read_only' state, but there are a few places where it
is ignored. In the bdrv_set_read_only() helper, make sure to
honor the flag.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: be2e5fb2d285cbece2b6d06bed54a6f56520d251.1491597120.git.jcody@redhat.com