kern/162905: -E flag in newfs has no effect

[Robert Millan]

>Number:         162905
>Category:       kern
>Synopsis:       -E flag in newfs has no effect
>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:   Sun Nov 27 17:00:21 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Robert Millan
>Release:        FreeBSD 9-STABLE
>Organization:
>Environment:
>Description:

-E flag in newfs doesn't erase the whole device. For one thing, it returns immediately (which is unexpected since DIOCGDELETE ioctl is a blocking call). On the other hand, pre-existing filesystems continue to be usable:

# zpool create -m none -f test /dev/ada1s1
# zpool export test
# newfs -E /dev/ada1s1
[...]
Erasing sectors [128...16773119]
[...]
# zpool import test
#

>How-To-Repeat:

>Fix:
I don't know the fix, but it seems most likely a kernel bug (I've verified that DIOCGDELETE ioctl is indeed being called).


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