mav 3b1508e471 Simplify statistics calculation.
Instead of trying to guess size of disk I/O operations (it just won't work
that way for newly added commands, and is equal to data move size for old
ones), account data move traffic.  If disk I/Os are that interesting, then
backends have to account and provide that information.

Block backend already exports the information about disk I/Os via devstat,
so having it here too is excessive.

MFC after:	2 weeks
2014-06-26 20:06:37 +00:00
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