virtio-scsi: Handle TMF request cancellation asynchronously
For VIRTIO_SCSI_T_TMF_ABORT_TASK and VIRTIO_SCSI_T_TMF_ABORT_TASK_SET, use scsi_req_cancel_async to start the cancellation. Because each tmf command may cancel multiple requests, we need to use a counter to track the number of remaining requests we still need to wait for. Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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