<SNIP>
I wander how we can skip sbc_dif_verify_xxxx if the transport already
offloaded DIF verify.
I think that the transport should signal the core layer that it is able
to offload DIF (ADD/STRIP/PASS/VERIFY), in which case the core should
turn off the backstore DIF verify emulation to sustain performance.
So IBLOCK + PSCSI backends will need to be a non interleaved protection
PASS for fast path operation, and backend protection emulation is
reserved for RAMDISK and perhaps a special FILEIO full emulation mode.
But can't we avoid that if transport already verified? This will kill
performance.
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