Description of problem:

Cannot convert xen local to kvm with useing virt-v2v command 
virt-v2v -i libvirtxml -op pool2  --bridge br0 skyhawk.xml
size (10485760000) < usage (10496020480) at /usr/share/perl5/vendor_perl/Sys/VirtV2V/Connection/LibVirtXMLSource.pm line 157, <$qemuimg> line 4.

Version-Release number of selected component (if applicable):

virt-v2v-0.7.1-3.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. virt-v2v -i libvirtxml -op <pool>  --bridge <bridge name> <xml file>

2.
3.
  
Actual results:
fail 

Expected results:
Convert locally vm successfully

Additional info:

# stat /temp2/xen/skyhawk
  File: `/temp2/xen/skyhawk'
  Size: 10485760000     Blocks: 20500040   IO Block: 4096   regular file
Device: 6815h/26645d    Inode: 16007172    Links: 1
Access: (0755/-rwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
...

size (10485760000) < usage (10496020480
20500040*512=10496020480

    146     if (-b $path) {
    147         $is_block = 1;
    148         $usage = $size;
    149         $is_sparse = 0;
    150     } else {
    151         $is_block = 0;
    152         my $st = stat($path);
    153         $usage = $st->blocks * 512;
    154         $is_sparse = $usage < $size ? 1 : 0;
    155     }
    156
    157     die("size ($size) < usage ($usage)") if $size < $usage;

Normally regular file size is less than disk usage if not sparse file.
So line 157 logic seems to be wrong. I think that it be removed.
In fact, after I commented out line 157, virt-v2v was success.