Description of problem:
When start a guest with floppy disk like
    <disk type='file' device='floppy'>
      <driver name='qemu' type='raw' cache='none'/>
      <source file='/var/lib/libvirt/images/floppy.img' startupPolicy='mandatory'/>
      <target dev='fda' bus='fdc'/>
      <address type='drive' controller='0' bus='0' unit='0'/>
    </disk>

or
    <disk type='file' device='floppy'>
      <driver name='qemu' type='raw' cache='none'/>
      <source file='/var/lib/libvirt/images/floppy.img' startupPolicy='requisite'/>
      <target dev='fda' bus='fdc'/>
      <address type='drive' controller='0' bus='0' unit='0'/>
    </disk>

it will report error like
error: Failed to start domain mig
error: cannot access file '/var/lib/libvirt/images/floppy.img': Success

but the file is accessible, with removing startupPolicy='requisite', guest can be started successfully

Version-Release number of selected component (if applicable):
kernel-2.6.32-230.el6.x86_64
qemu-kvm-0.12.1.2-2.231.el6.x86_64
libvirt-0.9.10-2.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Start a guest with floppy disk with adding startupPolicy='requisite' or 'mandatory' on source section, and the floppy disk is good
2.
3.
  
Actual results:
Report error like
error: Failed to start domain mig
error: cannot access file '/var/lib/libvirt/images/floppy.img': Success

Expected results:
guest can be started successfully

Additional info: