[Bug 1581764] [NEW] the rbd volume can not unmap when using multipath service

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Precondition: the node use multipath service.

Operation: unmap the rbd volume after mapping the volume to node

Error phenomenon:

      [root at 2C5_19_CG1 ~(keystone_admin)]# rbd unmap /dev/rbd5
       rbd: sysfs write failed
       rbd: unmap failed: (16) Device or resource busy

Causal analysis: the rbd volume was taken over by multipath service

** Affects: multipath-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: ceph multipath
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the rbd volume can not unmap when using multipath service
https://bugs.launchpad.net/bugs/1581764
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