Device IO dump

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I'm trying to use blktrace to capture IOs sent to the drive so I can
model a physical device.  In the end, I'd like to have a file with
each physical IO on a line, containing the issue time (D), complete
time (C), read/write flag, start block, and block count.  I could
almost get this from btt with the --per-io-dump option (with some
post-processing), but it doesn't seem to specify whether the IO is a
read or a write.  I tried --dump-blocknos since it separates reads and
writes, and I could theoretically use that to augment the data from
the per IO dump, but it seems to duplicate events sometimes.  What's
the best way to do this?
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