(Adding MKP + MST + Paolo CC')
So this doesn't quite follow what virtio-scsi request header is defining
for allowing both pi_bytesout + pi_bytesin within a single op. But then
again, virtio-scsi doesn't support BIDI commands either..
But if v2 TCMU ABI is support BIDI commands, then we'll also want to
allow individual request headers that contain T10-PI metadata for both
out/in payloads, yes..?
OK, define a u32 iov_bidi_dif_cnt field taken from the u64 __pad1 for this?
CC'd people please feel free to comment on other parts of TCMU design as
well. TCMU is the backstore-specific cousin of vhost-scsi, and it would
be great to get further review based upon experience from that work.
-- Andy
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