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The vhdx driver uses truncation for image growth, with a special case for blocks that already read as zero but which are only being partially written. But with a bit of rearranging, it's just as easy to defer the decision on whether truncation resulted in zeroes to the actual allocation attempt, reducing the number of places that still use bdrv_has_zero_init_truncate. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20200428202905.770727-9-eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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