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由 Christoph Hellwig 提交于
Use bdrv_pwrite to access the backing device instead of pread, and convert the driver to implementing the bdrv_open method which gives it an already opened BlockDriverState for the underlying device. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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