Commits on Feb 25, 2019

1. hostpath: Add block volume support …

   This change adds block volume support to hostpath driver.
   
   When a block volume request is received, a block file is created at
   provisionRoot with the requested capacity as size and a loop device is
   created associated with the block file.
   
   At node publish, a bind mount of the loop device is created at the
   publish target path.
   
   At node unpublish, the target path is unmounted and deleted.
   
   At volume delete, loop device is disassociated and the block file is
   deleted.
   
   Add plugins-dir to hostpath plugin daemonset
   The volume publish target path for block devices are usually under
   /var/lib/kubelet/plugins directory. Hence, adding plugins directory to
   the pod volumes with bidirectional mount propagation.
   
   Run the plugin as privileged to use loop devices
   In order to share loop devices with the host, the plugin container must
   be run as a privileged container.

   

   darkowlzz committed Feb 25, 2019
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