> There has been talk, at various stages, of a method that should be
> developed to allow the actual drives (spindles) that underly a
> filesystem (device upon which a filesystem may reside) to be located.

I'd like to see such a thing too; my live-backup code could definitely
benefit from it (to avoid thrashing a spindle by doing rescans on
multiple partitions at once).

> +			j = VOP_IOCTL(cs->sc_cinfo[i].ci_vp, cmd, data,
> +				      flag, uc, l);

Isn't it slightly more efficient to specify DIOCGSPINDLES instead of
cmd in the subcall?

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