[parted-devel] parted doesn't report correct file system type.

[Joel Granados]

----- "Mike Hwang" <Mike.Hwang at iqstor.com.cn> wrote:

> I originally created ReiserFS
> on /dev/mapper/SIQSTOR_iQ2880_000388BE0E0000A5-part1, and format it
> with LVM2 later.

And what fs did you install on part1?  This looks like the lvm2 tool did the format put did not modify the partition table.  And when parted went to look at the partition table after the lvm creation, it found the previous fs info.

Does this still happen if you execute a mkfs.ext3 on the newly created lvm?

This could be considered an issue.  But think about this:  if you don't have a filesystem on the partition, its going to be unusable anyway.  Of course giving the wrong information is inexcusable in this case because the user is going to think that there is a filesystem in the partition.

We could check to see if the partition actually contains the filesystem, but I guess that there is also a possibility of metadata remaining after a change to the partition.  And it goes against the idea of parted not being a tool for filesystems.

I guess the best solution in this case might be to stop giving the filesystem information by default, because it could be inacurate.  And have a `parted print fs` to read the fs metadata off the partition table.  And to tell the user that it might be inaccurate.

Regards

> It looks like 'vol_id' and 'parted' print different thing.
> 
> 
> dell1900-28:/mnt/mike/branches/5210-dev/test #
> vol_id /dev/mapper/SIQSTOR_iQ2880_000388BE0E0000A5-part1 
> ID_FS_USAGE=raid
> ID_FS_TYPE=LVM2_member
> ID_FS_VERSION=LVM2 001
> ID_FS_UUID=2iEgCE-1e7C-2orM-QImw-Gw3a-OVdi-vciaYD
> ID_FS_LABEL=
> ID_FS_LABEL_SAFE=
> dell1900-28:/mnt/mike/branches/5210-dev/test #
> parted /dev/mapper/SIQSTOR_iQ2880_000388BE0E0000A5
> GNU Parted 1.8.8.1.84-e1e7
> Using /dev/mapper/SIQSTOR_iQ2880_000388BE0E0000A5
> Welcome to GNU Parted! Type 'help' to view a list of commands.
> (parted)
> p                                                                
> Model: Linux device-mapper (multipath) (dm)
> Disk /dev/mapper/SIQSTOR_iQ2880_000388BE0E0000A5: 107GB
> Sector size (logical/physical): 512B/512B
> Partition Table: gpt
> 
> Number  Start   End     Size    File system  Name    Flags
>  1      17.4kB  94.5GB  94.5GB  reiserfs     mike01       
> 
> (parted)
> quit                                                             
> dell1900-28:/mnt/mike/branches/5210-dev/test # 
> 
> 
> -- 
> Mike Hwang
> 
> http://www.iqstor.com
> Phone: 62974477-612
> 
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-- 
Joel Andres Granados
Red Hat / Brno Czech Republic