[Bugs] [Bug 1217786] New: Data Tiering : Adding performance to unlink/link/rename in CTR Xlator

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1217786

            Bug ID: 1217786
           Summary: Data Tiering : Adding performance to
                    unlink/link/rename in CTR Xlator
           Product: GlusterFS
           Version: mainline
         Component: tiering
          Assignee: bugs at gluster.org
          Reporter: josferna at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



Description of problem:
ctr/libgfdb: Performance enhancer for unlink/create/rename/link fops

1) ctr_link_consistency option for ctr xaltor is provided so that
   the user can choose to switch it on or off.
   /* For link consistency we do a double update i.e mark the link
   * during the wind and during the unwind we update/delete the link.
   * This has a performance hit. We give a choice here whether we need
   * link consistency to be spoton or not using link_consistency flag.
   * This will have only one link update */
2) In delete the wind time recording is moved to unwind path.
   /* Special performance case:
   * Updating wind time in unwind for delete. This is done here
   * as in the wind path we will not know whether its the last
   * link or not. For a last link there is not use to update any
   * wind or unwind time!*/

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