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由 Paolo Bonzini 提交于
Mirroring runs without the backing file so that it can be copied outside QEMU. However, we need to add it at the time the job is completed and QEMU switches to the target. Factor out the common bits of opening an image and completing a mirroring operation. The new function does not assume that the file is closed immediately after it returns failure, so it keeps the BDRV_O_NO_BACKING flag up-to-date. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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