kern/170523: zfs rename pool@snapshot1 pool@snapshot2 UNMOUNTS dataset

[vermaden]

>Number:         170523
>Category:       kern
>Synopsis:       zfs rename pool at snapshot1 pool at snapshot2 UNMOUNTS dataset
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Aug 10 10:50:00 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     vermaden
>Release:        9.0-RELEASE / 9.1-PRERELEASE
>Organization:
>Environment:
Stock 9.0-RELEASE and 9.1-PRERELEASE r239132 amd64
>Description:
It is not possible to rename ZFS SNAPSHOT that is cloned and mounted as / filesystem.
>How-To-Repeat:

>Fix:
Should be as easy as that one:
http://www.freebsd.org/cgi/query-pr.cgi?pr=167905

>Release-Note:
>Audit-Trail:
>Unformatted: