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Description of problem:
If use fuse mount to create qcow3 image,it is successful.
If use fuse bypass or fuse mount to create qcow2 image, both are successful.
only qemu-img don't support to create qcow3 images with fuse bypass

Version-Release number of selected component (if applicable):
qemu-kvm and kernel version: 
qemu-kvm-1.5.2-2.el7.x86_64
3.10.0-4.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.# qemu-img create -f qcow2 -o compat=1.1 gluster://10.66.6.82:24007/gv0/RHEL-7.0.qcow3  20G
2.
3.

Actual results:
Formatting 'gluster://10.66.6.82:24007/gv0/RHEL-7.0.qcow3', fmt=qcow2 size=21474836480 compat='1.1' encryption=off cluster_size=65536 lazy_refcounts=off 
qemu-img: Header extension too large
qemu-img: gluster://10.66.6.82:24007/gv0/RHEL-7.0.qcow3: error while creating qcow2: Invalid argument


Expected results:
create sucessfully.

Additional info:

*** This bug has been marked as a duplicate of bug 1032904 ***