block/qcow2: Metadata preallocation for truncate
We can support PREALLOC_MODE_METADATA by invoking preallocate() in qcow2_truncate(). Signed-off-by: NMax Reitz <mreitz@redhat.com> Message-id: 20170613202107.10125-12-mreitz@redhat.com Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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