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由 Kevin Wolf 提交于
change_parent_backing_link() will need to update multiple BdrvChild objects at once. Checking permissions reference by reference doesn't work because permissions need to be consistent only with all parents moved to the new child. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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