kern/42210: rename EXDEV & abortop fail

[pooka%iki.fi@localhost]

>Number:         42210
>Category:       kern
>Synopsis:       rename EXDEV & abortop fail
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Oct 21 19:30:00 +0000 2009
>Originator:     Antti Kantee
>Release:        
>Organization:
read it and weep inc.
>Environment:
>Description:
In a new and exciting episode of "I thought we fixed the last bug
from rename last week", plenty of drivers will happily fail VOP_RENAME
with EXDEV but neglect to call VOP_ABORTOP.  Notably, since one of the
vnodes might be of completely different type, a given driver
cannot decide to just not call abortop because it "knows" it's
not required.
>How-To-Repeat:

>Fix:
Is there some layering marvel preventing us from checking for
EXDEV before calling rename?  otherwise, have fun