[Bug 226536] glabel/partition mixup on sdcard images

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226536

            Bug ID: 226536
           Summary: glabel/partition mixup on sdcard images
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: trasz at FreeBSD.org

The sdcard images distributed by the project contain two level (MBR/BSD)
partition table.  The root filesystem is mounted using UFS label, "ufs/rootfs".
 Problem is, the label gets attached to the wrong device: mmcsd0s2 instead of
mmcsd0s2a.  The result is that on first startup, only the first level of
partition table gets resized, which can result in significant confusion when
moving the SD card to another system.

Looking at the image on another system (using md(4)), it looks like this:

[trasz at brick:~]% gpart show

[snip]

=>     63  6291393  md0  MBR  (3.0G)
       63      961       - free -  (481K)
     1024    34816    1  !12  [active]  (17M)
    35840  6255616    2  freebsd  (3.0G)

=>      0  6255616  md0s2  BSD  (3.0G)
        0  6255616      1  freebsd-ufs  (3.0G)

=>      0  6255616  ufsid/5a570a62577263b8  BSD  (3.0G)
        0  6255616                       1  freebsd-ufs  (3.0G)

=>      0  6255616  ufs/rootfs  BSD  (3.0G)
        0  6255616           1  freebsd-ufs  (3.0G)

[trasz at brick:~]% glabel list   

[snip]

Geom name: md0s1               
Providers:                     
1. Name: msdosfs/MSDOSBOOT
   Mediasize: 17825792 (17M)
   Sectorsize: 512       
   Stripesize: 0
   Stripeoffset: 524288
   Mode: r0w0e0      
   secoffset: 0      
   offset: 0         
   seclength: 34816
   length: 17825792            
   index: 0       
Consumers:                     
1. Name: md0s1           
   Mediasize: 17825792 (17M)
   Sectorsize: 512       
   Stripesize: 0
   Stripeoffset: 524288
   Mode: r0w0e0

Geom name: md0s2
Providers:
1. Name: ufsid/5a570a62577263b8
   Mediasize: 3202875392 (3.0G)
   Sectorsize: 512
   Stripesize: 0
   Stripeoffset: 18350080
   Mode: r0w0e0
   secoffset: 0
   offset: 0
   seclength: 6255616
   length: 3202875392
   index: 0
Consumers:
1. Name: md0s2
   Mediasize: 3202875392 (3.0G)
   Sectorsize: 512
   Stripesize: 0
   Stripeoffset: 18350080
   Mode: r0w0e0

Geom name: md0s2
Providers:
1. Name: ufs/rootfs
   Mediasize: 3202875392 (3.0G)
   Sectorsize: 512
   Stripesize: 0
   Stripeoffset: 18350080
   Mode: r0w0e0
   secoffset: 0
   offset: 0
   seclength: 6255616
   length: 3202875392
   index: 0
Consumers:
1. Name: md0s2
   Mediasize: 3202875392 (3.0G)
   Sectorsize: 512
   Stripesize: 0
   Stripeoffset: 18350080
   Mode: r0w0e0

Notice how the last consumer is md0s2 instead of md0s2a.

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