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block: Add BB-BDS remove/insert notifiers
bdrv_close() no longer signifies ejection of a medium, this is now done by removing the BDS from the BB. Therefore, we want to have a notifier for that in the BB instead of a close notifier in the BDS. The former is added now, the latter is removed later. Symmetrically, another notifier list is added that is invoked whenever a BDS is inserted. We will need that for virtio-blk and virtio-scsi, which can then remove their op blockers on BDS ejection and set them up on insertion. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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