kern/43617: tmpfs rename dir1 dir2/.. succeeds

[pooka%iki.fi@localhost]

>Number:         43617
>Category:       kern
>Synopsis:       tmpfs rename dir1 dir2/.. succeeds
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 14 17:30:00 +0000 2010
>Originator:     Antti Kantee
>Release:        
>Organization:
>Environment:
>Description:
Other file systems fail with EINVAL.  Nothing perceivable happens,
though.  I did not analyze it further to see if some state gets
corrupted.

will commit test soon
>How-To-Repeat:

>Fix: