kern/157739: GPT labels with geom_multipath

[Vladimir Pushkar]

>Number:         157739
>Category:       kern
>Synopsis:       GPT labels with geom_multipath
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jun 10 10:00:17 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Vladimir Pushkar
>Release:        8.2-STABLE
>Organization:
Digital-Ventures Ltd.
>Environment:
FreeBSD l9-host6.inside.digital-ventures.net 8.2-STABLE FreeBSD 8.2-STABLE #0: Fri Jun 10 11:31:14 EEST 2011     root at l9-host6.inside.digital-ventures.net:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
Geom label using GPT labels on geom multipath consumers instead of providers.


>How-To-Repeat:
Create multipath device configuration with gmultipath utility. F.Ex.:
          Name  Status  Components
multipath/data     N/A  da1
                        da2

Then create a GPT label on top of multipath device (in our example it will be /dev/multipath/data) with such command:
gpart add -t freebsd-zfs -l data /dev/multipath/data

and then after reboot in "glabel list" you can see:
Geom name: da1p1
Providers:
1. Name: gpt/data
   Mediasize: 7000000788480 (6.4T)
   Sectorsize: 512
   Stripesize: 0
   Stripeoffset: 17408
   Mode: r1w1e1
   secoffset: 0
   offset: 0
   seclength: 13671876540
   length: 7000000788480
   index: 0
Consumers:
1. Name: da1p1
   Mediasize: 7000000788480 (6.4T)
   Sectorsize: 512
   Stripesize: 0
   Stripeoffset: 17408
   Mode: r1w1e2

device da1p1 instead of multipath/data.

>Fix:


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