block: reopen: Queue children after their parents
We will calculate the required new permissions in the prepare stage of a reopen. Required permissions of children can be influenced by the changes made to their parents, but parents are independent from their children. This means that permissions need to be calculated top-down. In order to achieve this, queue parents before their children rather than queuing the children first. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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