block/qcow2: falloc/full preallocating growth
Implement the preallocation modes falloc and full for growing qcow2 images. Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-id: 20170613202107.10125-15-mreitz@redhat.com Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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