struct statfs reads/writes changes?

I have some code that counts f_syncwrites, f_asyncwrites, f_syncreads,
and f_asyncreads from struct statfs to get rough file system reads and
writes statistics.  The code works under RELENG_4 and RELENG_5, but not
under -CURRENT.  Under -CURRENT, all the counters are 0.  Is this by
design, and if so, what should I be using instead, and can sys/mount.h
be updated to reflect the deprecation of these members?

If this isn't by design, is there a workaround I can use until this gets
fixed?  Thanks.

Joe

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