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Description of problem:
snapshot-create can not work
# virsh snapshot-create qcow2
error: argument unsupported: unable to handle disk requests in snapshot


Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.185.el6.x86_64
libvirt-0.9.4-10.el6.x86_64
kernel-2.6.32-193.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. create a guest with qcow2 img
2. do # virsh snapshot-create qcow2
  
Actual results:
error: argument unsupported: unable to handle disk requests in snapshot

Expected results:
snapshot create successfully

Additional info:
snapshot-create can work well on libvirt-0.9.4-7, so it is a regression bug, it doesn't work since libvirt-0.9.4-8

I'm looking into it now.

Upstream patch: https://www.redhat.com/archives/libvir-list/2011-September/msg00395.html

In POST:
http://post-office.corp.redhat.com/archives/rhvirt-patches/2011-September/msg00300.html

verify pass on 
qemu-kvm-0.12.1.2-2.185.el6.x86_64
kernel-2.6.32-193.el6.x86_64
libvirt-0.9.4-11.el6.x86_64


# virsh snapshot-create foo 
Domain snapshot 1315536642 created

# virsh snapshot-list foo
 Name                 Creation Time             State
------------------------------------------------------------
 1315536642           2011-09-09 10:50:42 +0800 running

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1513.html