nbd: fix how we set bd_invalidated
bd_invalidated is kind of a pain wrt partitions as it really only triggers the partition rescan if it is set after bd_ops->open() runs, so setting it when we reset the device isn't useful. We also sporadically would still have partitions left over in some disconnect cases, so fix this by always setting bd_invalidated on open if there's no configuration or if we've had a disconnect action happen, that way the partition table gets invalidated and rescanned properly. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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