creating qcow2 image with preallocation fails if size >=4G

[Marek Mrva]

Steps to reproduce:
  1. run> qemu-img create -f qcow2 -o cluster_size=512,preallocation=metadata disk.img 4G

Reproducible:
  Always

Configuration:
  Gentoo Linux 3.4.9, 64b
  latest qemu available from portage (afaik this is pulled from the git repo)

Possible workarounds:
  1. ommit preallocation=
  2. increase cluster_size
  3. reduce the image size

Although workarounds are available, it is still a bug that could (and should) be fixed.

[Michael Tokarev (mjt+launchpad-tls)]

This is fixed by the following patch: http://<email address hidden>/msg138606.html

[Michael Tokarev (mjt+launchpad-tls)]

This is fixed by commit a3548077062dd9dc2701ebffd931ba6eaef40bec which is included in 1.3 release of qemu.