sheepdog: use BDRV_POLL_WHILE
This is important when the sheepdog driver works on a BlockDriverState that is attached to an I/O thread other than the main thread. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Message-Id: <1477565348-5458-11-git-send-email-pbonzini@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com>
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