Automatic merge from submit-queue (batch tested with PRs 55908, 55829, 55293, 55653, 55665). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. If mountPath is missing, prefix with root dir. If `mountPath` is not absolute, add the os-specific root directory as a prefix. Ref: https://github.com/kubernetes/kubernetes/pull/51240 https://groups.google.com/forum/#!topic/kubernetes-sig-storage/k_0Wr2kYkpU @thockin @saad-ali @andyzhangx Note to @thockin I left the validation in place, in seems like it is a net win, since it will give a decent error message to most people, but the fall-back defaulting is there if it doesn't catch 'c:' I'm happy to rip out the validation if that is preferable to everyone. Let me know. ```release-note If a non-absolute mountPath is passed to the kubelet, prefix it with the appropriate root path. ```
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