vol_id: broken linux_raid detection

vol_id: broken linux_raid detection

[Michael Prokop]

Hi,

whereas vol_id displayed linux_raid_member as ID_FS_TYPE for
partitions with filesystem type fd fine so far, I noticed a problem
with current versions of udev. Using vol_id now displays the
filesystem of the given partition (for example 'xfs') instead of
'linux_raid_member'. :(

I've tracked down the problem using bisect to the following commit:

,----
| aa68c048f84b95fd982cb0fb2210ea740dbebc64 is first bad commit
| commit aa68c048f84b95fd982cb0fb2210ea740dbebc64
| Author: Kay Sievers <kay.sievers@suse.de>
| Date:   Wed Nov 15 20:41:25 2006 +0100
|
|     volume_id: fix endianess bug in linux_raid detection
|
| :040000 040000 aa1a4943fea035173411b1f5a70ee967007c14d4 9a58a1edba50f7e3aa5f9c33d8aa560ebbf00aa8 M  extras
`----

I'm running a Debian based system using kernel 2.6.19 on a x86
system. Any hints? If you need any further information please let me
know.

-mika-
-- 
 ,'"`.         http://www.michael-prokop.at/
(  grml.org -» Linux Live-CD for texttool-users and sysadmins
 `._,'         http://www.grml.org/


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Re: vol_id: broken linux_raid detection

[Kay Sievers]

On 2/2/07, Michael Prokop <mika@grml.org> wrote:
> whereas vol_id displayed linux_raid_member as ID_FS_TYPE for
> partitions with filesystem type fd fine so far, I noticed a problem
> with current versions of udev. Using vol_id now displays the
> filesystem of the given partition (for example 'xfs') instead of
> 'linux_raid_member'. :(
>
> I've tracked down the problem using bisect to the following commit:
>
> ,----
> | aa68c048f84b95fd982cb0fb2210ea740dbebc64 is first bad commit
> | commit aa68c048f84b95fd982cb0fb2210ea740dbebc64
> | Author: Kay Sievers <kay.sievers@suse.de>
> | Date:   Wed Nov 15 20:41:25 2006 +0100
> |
> |     volume_id: fix endianess bug in linux_raid detection
> |
> | :040000 040000 aa1a4943fea035173411b1f5a70ee967007c14d4 9a58a1edba50f7e3aa5f9c33d8aa560ebbf00aa8 M  extras

The volume is a member of a md raid set? What does:
  /lib/udev/vol_id --probe-all /dev/...
print?

Kay

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Re: vol_id: broken linux_raid detection

[Michael Prokop]

* Kay Sievers <kay.sievers@vrfy.org> wrote:
> On 2/2/07, Michael Prokop <mika@grml.org> wrote:

>> whereas vol_id displayed linux_raid_member as ID_FS_TYPE for
>> partitions with filesystem type fd fine so far, I noticed a problem
>> with current versions of udev. Using vol_id now displays the
>> filesystem of the given partition (for example 'xfs') instead of
>> 'linux_raid_member'. :(

>> I've tracked down the problem using bisect to the following commit:

>> ,----
>> | aa68c048f84b95fd982cb0fb2210ea740dbebc64 is first bad commit
>> | commit aa68c048f84b95fd982cb0fb2210ea740dbebc64
>> | Author: Kay Sievers <kay.sievers@suse.de>
>> | Date:   Wed Nov 15 20:41:25 2006 +0100
>> |
>> |     volume_id: fix endianess bug in linux_raid detection
>> |
>> | :040000 040000 aa1a4943fea035173411b1f5a70ee967007c14d4 9a58a1edba50f7e3aa5f9c33d8aa560ebbf00aa8 M  extras

> The volume is a member of a md raid set?

Yes, used to work fine under any circumstances so far. I'm testing
the different vol_id/udev versions on the same system (using my
live-cd), same setup, kernel, raid configuration,... just switching
between the udev versions.

> What does:
>   /lib/udev/vol_id --probe-all /dev/...
> print?

Broken vol_id:

# /lib/udev/vol_id --probe-all /dev/hda1
xfs

Older, working vol_id:

# /lib/udev/vol_id --probe-all /dev/hda1
linux_raid_member
xfs

thx && regards,
-mika-
-- 
 ,'"`.         http://www.michael-prokop.at/
(  grml.org -» Linux Live-CD for texttool-users and sysadmins
 `._,'         http://www.grml.org/


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Re: vol_id: broken linux_raid detection

[Kay Sievers]

On 2/3/07, Michael Prokop <mika@grml.org> wrote:
> * Kay Sievers <kay.sievers@vrfy.org> wrote:
> > On 2/2/07, Michael Prokop <mika@grml.org> wrote:
>
> >> whereas vol_id displayed linux_raid_member as ID_FS_TYPE for
> >> partitions with filesystem type fd fine so far, I noticed a problem
> >> with current versions of udev. Using vol_id now displays the
> >> filesystem of the given partition (for example 'xfs') instead of
> >> 'linux_raid_member'. :(
>
> >> I've tracked down the problem using bisect to the following commit:
>
> >> ,----
> >> | aa68c048f84b95fd982cb0fb2210ea740dbebc64 is first bad commit
> >> | commit aa68c048f84b95fd982cb0fb2210ea740dbebc64
> >> | Author: Kay Sievers <kay.sievers@suse.de>
> >> | Date:   Wed Nov 15 20:41:25 2006 +0100
> >> |
> >> |     volume_id: fix endianess bug in linux_raid detection
> >> |
> >> | :040000 040000 aa1a4943fea035173411b1f5a70ee967007c14d4 9a58a1edba50f7e3aa5f9c33d8aa560ebbf00aa8 M  extras
>
> > The volume is a member of a md raid set?
>
> Yes, used to work fine under any circumstances so far. I'm testing
> the different vol_id/udev versions on the same system (using my
> live-cd), same setup, kernel, raid configuration,... just switching
> between the udev versions.
>
> > What does:
> >   /lib/udev/vol_id --probe-all /dev/...
> > print?
>
> Broken vol_id:
>
> # /lib/udev/vol_id --probe-all /dev/hda1
> xfs
>
> Older, working vol_id:
>
> # /lib/udev/vol_id --probe-all /dev/hda1
> linux_raid_member
> xfs

I found it, and will fix it. We need to look for the signature in both
endian encodings, because they are written to disk in cpu order:
  hexdump Intel:
  003b0000  fc 4e 2b a9 00 00 00 00  5a 00 00 00 00 00 00 00  |.N+.....Z.......|

  hexdump PowerPC:
  00000000  a9 2b 4e fc 00 00 00 00  00 00 00 5a 00 00 00 00  |.+N........Z....|

Oh man, what a crazy job, to guess filesystems. :)

Thanks,
Kay

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