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block: Implement .bdrv_has_zero_init_truncate()
We need to implement .bdrv_has_zero_init_truncate() for every block driver that supports truncation and has a .bdrv_has_zero_init() implementation. Implement it the same way each driver implements .bdrv_has_zero_init(). This is at least not any more unsafe than what we had before. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20190724171239.8764-5-mreitz@redhat.com Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
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