This is ready for review/sponsorship.

** Description changed:
  [ Impact ]
  
   * Users experience SEGFAULTs when Ganesha fails to communicate with
  Gluster, causing the NFS share to disappear.
  
   * The patch refactors how free_space() is called to avoid the null
  pointer deference.
  
  [ Test Plan ]
  
   * The triggers for the issue are difficult to replicate and have to do
- with the timing of Ganesha communicating with Gluster.
+ with the timing of Ganesha communicating with Gluster. I have compiled
+ the patch against version 4.3-8ubuntu1 of nfs-ganesha and it resolved
+ the issue on my system.
  
  [ Other Info ]
  
   * Commit which added this patch: 
https://github.com/nfs-ganesha/nfs-ganesha/commit/336abcba0b9e0dae0aadb4657c311d04862f2028
   * Issue discussion: https://github.com/nfs-ganesha/nfs-ganesha/issues/904

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https://bugs.launchpad.net/bugs/2065856

Title:
  SEGFAULTs in v4.3 with GlusterFS

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