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由 Gao feng 提交于
This helper function is used to create parent directory for the hostdev which will be added to the container. If the parent directory of this hostdev doesn't exist, the mknod of the hostdev will fail. eg with /dev/net/tun Signed-off-by: NGao feng <gaofeng@cn.fujitsu.com> (cherry picked from commit c0d8c7c8)
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