[bug #29956] grub-probe --target=fs failure on BSD partitions

[Grégoire Sutre]

URL:
  <http://savannah.gnu.org/bugs/?29956>

                 Summary: grub-probe --target=fs failure on BSD partitions
                 Project: GNU GRUB
            Submitted by: gsutre
            Submitted on: Tue 25 May 2010 02:06:44 AM CEST
                Category: Disk &amp; Partition
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Bazaar - trunk
         Reproducibility: Every Time
         Planned Release: None

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Details:

When the partition is listed in the DOS MBR, grub-probe --target=fs on a BSD
partition is successful.  But if that partition is not listed in the MBR, then
the same command fails.

Tests have been performed on NetBSD/i386 with a USB key.

The NetBSD disk label is:

9 partitions:
#        size    offset     fstype [fsize bsize cpg/sgs]
 c:    338688   3624768     unused      0     0        # (Cyl.   3596 -  
3931)
 d:   3964928         0     unused      0     0        # (Cyl.      0 -  
3933*)
 g:    499905        63      MSDOS                     # (Cyl.      0*-   
495)
 h:   3124800    499968 Linux Ext2      0     0        # (Cyl.    496 -  
3595)
 i:    338688   3624768     4.2BSD      0     0     0  # (Cyl.   3596 -  
3931)

The DOS disk label is:

Partition table:
0: Primary DOS with 32 bit FAT (sysid 11)
    start 63, size 499905 (244 MB, Cyls 0-123)
1: Linux native (sysid 131)
    start 499968, size 3124800 (1526 MB, Cyls 124-898)
        PBR is not bootable: All bytes are identical (0x00)
2: NetBSD (sysid 169)
    start 3624768, size 338688 (165 MB, Cyls 899-982)
3: <UNUSED>

Here, everything works fine:

$ grub2-probe -v --target=drive --device-map=/dev/null -d /dev/rsd0g
grub2-probe: info: /dev/rsd0g starts from 63.
grub2-probe: info: opening the device /dev/rsd0d.
grub2-probe: info: the size of /dev/rsd0d is 3964928.
grub2-probe: info: Partition 0 starts from 63.
(/dev/rsd0d,1)
$ grub2-probe -v --target=fs --device-map=/dev/null -d /dev/rsd0g
grub2-probe: info: /dev/rsd0g starts from 63.
grub2-probe: info: opening the device /dev/rsd0d.
grub2-probe: info: the size of /dev/rsd0d is 3964928.
grub2-probe: info: Partition 0 starts from 63.
grub2-probe: info: opening /dev/rsd0d,1.
grub2-probe: info: the size of /dev/rsd0d is 3964928.
fat


I now remove the DOS partition #0 from the MBR partition table, but without
changing the NetBSD disklabel, I then get:

Partition table:
0: <UNUSED>
1: Linux native (sysid 131)
    start 499968, size 3124800 (1526 MB, Cyls 124-898)
        PBR is not bootable: All bytes are identical (0x00)
2: NetBSD (sysid 169)
    start 3624768, size 338688 (165 MB, Cyls 899-982)
3: <UNUSED>

$ grub2-probe -v --target=drive --device-map=/dev/null -d /dev/rsd0g
grub2-probe: info: /dev/rsd0g starts from 63.
grub2-probe: info: opening the device /dev/rsd0d.
grub2-probe: info: the size of /dev/rsd0d is 3964928.
grub2-probe: info: Partition 1 starts from 499968.
grub2-probe: info: Partition 2 starts from 3624768.
grub2-probe: info: Partition 6 starts from 4291342591.
(/dev/rsd0d,3,7)
$ grub2-probe -v --target=fs --device-map=/dev/null -d /dev/rsd0g
grub2-probe: info: /dev/rsd0g starts from 63.
grub2-probe: info: opening the device /dev/rsd0d.
grub2-probe: info: the size of /dev/rsd0d is 3964928.
grub2-probe: info: Partition 1 starts from 499968.
grub2-probe: info: Partition 2 starts from 3624768.
grub2-probe: info: Partition 6 starts from 4291342591.
grub2-probe: info: opening /dev/rsd0d,3,7.
grub2-probe: info: the size of /dev/rsd0d is 3964928.
grub2-probe: error: unknown filesystem.


So grub-probe --target=fs fails when the partition is accessed as
(/dev/rsd0d,msdos3,bsd7) instead of (/dev/rsd0d,msdos1).





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