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由 Eric Blake 提交于
Update bdrv_co_do_write_zeroes() to be byte-based, and select between the new byte-based bdrv_co_pwrite_zeroes() or the old bdrv_co_write_zeroes(). The next patches will convert drivers, then remove the old interface. Signed-off-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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