[parted-devel] File System Type Not Detected with 4096 byte Sector Size Device

[Curtis Gedak]

It appears that parted does not detect the file system type when used 
with a device with 4096 byte sector size.  I performed my testing on the 
Ubuntu 10.04 beta2 distribution using the latest version (April 27, 
2010) of parted from the git repository.

Since I do not have a device with a 4096 byte sector size, I used the 
SCSI_DEBUG module to emulate such a device.

The steps I used are as follows:

1)  Create a device with a 4096 byte sector size.

     $ modprobe scsi_debug dev_size_mb=96 sector_size=4096

     NOTE:  In my case this created device "/dev/sdc".

2)  Create an msdos disk label on the device.

     $ parted -s /dev/sdc mklabel msdos

3)  Create an ext2 partition that spans the device.

     $ parted -s /dev/sdc mkpart primary ext2 64s 100%

4)  Create an ext2 file system on the partition.

     $ mkfs.ext2 /dev/sdc1

5)  Print out the partition table and discover the missing file system type.

     $ sudo parted /dev/sdc unit s print
     Model: Linux scsi_debug (scsi)
     Disk /dev/sdc: 24576s
     Sector size (logical/physical): 4096B/4096B
     Partition Table: msdos

     Number  Start  End     Size    Type     File system  Flags
      1      64s    24575s  24512s  primary

     $

     NOTE the missing "ext2" that should be listed under the "File 
system" column.

Please note that this problem did not occur when I created a SCSI_DEBUG 
device using a sector size of 512 bytes.

Regards,
Curtis Gedak