[Bugs] [Bug 1399450] New: Backport few of the md-cache enhancements from master to 3.9

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1399450

            Bug ID: 1399450
           Summary: Backport few of the md-cache enhancements from master
                    to 3.9
           Product: GlusterFS
           Version: 3.9
         Component: md-cache
          Assignee: bugs at gluster.org
          Reporter: pgurusid at redhat.com
                CC: bugs at gluster.org



Description of problem:
The md-cache improvemets feature implemented as a part of BZ: 1211863, is not
yet completely backported to 3.9. Backport the following patches as a part of
this BZ:
[9ab5b52] afr: Implement IPC fop
[0fd7d0e] tests: Fix one of the md-cache test cases
[359b72a] ec: Implement ipc fop
[8d8eded] md-cache, afr: Reduce the window of stale read


Version-Release number of selected component (if applicable):


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