update-link-count-parent POSIX xlator parameter

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What is update-link-count-parent POSIX xlator parameter for?  Is it ever set by anyone and why?  It appears to be off by default.  Didn't see this documented, but the log message in posix.c says:  "update-link-count-parent is enabled. Thus for each file an extended attribute representing the number of hardlinks for that file within the same parent directory is set."  Why would this be necessary?  

background: I'm trying to see where various xattr calls per file read are coming from.


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