misc/150555: gjournal unusable on GPT partitions

>Number:         150555
>Category:       misc
>Synopsis:       gjournal unusable on GPT partitions
>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:   Tue Sep 14 11:40:02 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Robert Schulze
>Release:        8.1-STABLE
>Organization:
>Environment:
FreeBSD xxxxxx 8.1-STABLE FreeBSD 8.1-STABLE #5: Tue Sep  7 15:25:10 CEST 2010     root@xxxxxx:/usr/obj/usr/src/sys/VPOOL  amd64

>Description:
Enabling a gjournal on a GPT partitioned disk (da0 with da0p1) results in a journal not being able to disable. Without partitions (operating purely on da0), gjournal behaves correctly.

Furthermore, one may disable gjournal continously with two different provider names, without coming to an end:

# gjournal stop da0p1.journal
# gjournal list
ID: 1247948886
Providers:
1. Name: gptid/30da8781-bff2-11df-bbf1-001b21153950.journal
   Mediasize: 20401094144 (19G)
   Sectorsize: 512
   Mode: r0w0e0
Consumers:
1. Name: gptid/30da8781-bff2-11df-bbf1-001b21153950
   Mediasize: 21474836480 (20G)
   Sectorsize: 512
   Mode: r1w1e1
   Jend: 21474835968
   Jstart: 20401094144
   Role: Data,Journal

# gjournal stop gptid/30da8781-bff2-11df-bbf1-001b21153950.journal
# gjournal list
Geom name: gjournal 1247948886
ID: 1247948886
Providers:
1. Name: da0p1.journal
   Mediasize: 20401094144 (19G)
   Sectorsize: 512
   Mode: r0w0e0
Consumers:
1. Name: da0p1
   Mediasize: 21474836480 (20G)
   Sectorsize: 512
   Mode: r1w1e1
   Jend: 21474835968
   Jstart: 20401094144
   Role: Data,Journal

and so on.
>How-To-Repeat:
# gpart create -s GPT da0
# gpart add -t freebsd-ufs -s 20G da0
# gjournal label da0p1
# newfs -O 2 -J /dev/da0p1.journal
# mount /dev/da0p1.journal /mnt
# dd if=/dev/zero of=/mnt/file bs=1M count=1k
# umount /mnt
# gjournal sync
# gjournal stop da0p1.journal
# gjournal clear da0p1
Cannot clear metadata on da0p1: Operation not permitted.
gjournal: Not fully done.

>Fix:

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