drbd: only restart frozen disk io when D_UP_TO_DATE
When re-attaching the local backend device to a C_STANDALONE D_DISKLESS R_PRIMARY with OND_SUSPEND_IO, we may only resume IO if we recognize the backend that is being attached as D_UP_TO_DATE. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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