# fdisk -l /dev/loop0

Disk /dev/loop0: 268.4 GB, 268435456000 bytes
255 heads, 63 sectors/track, 32635 cylinders, total 524288000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0008c653

      Device Boot      Start         End      Blocks   Id  System
/dev/loop0p1   *        2048      499711      248832   83  Linux
/dev/loop0p2          501758   524285951   261892097    5  Extended
/dev/loop0p5          501760   524285951   261892096   8e  Linux LVM

# partx -a /dev/loop0
partx: /dev/loop0: error adding partitions 1-2
partx: /dev/loop0: error adding partition 5