block: Remove some unnecessary bi_vcnt usage
 

On Mon, Sep 10, 2012 at 05:22:20PM -0700, Kent Overstreet wrote:
> More prep work for immutable bvecs/effecient bio splitting - usage of
> bi_vcnt has to be auditing, so getting rid of all the unnecessary usage
> makes that easier.
>
> Plus, bio_segments() is really what this code wanted, as it respects the
> current value of bi_idx.

Looks good to me but definitely need reviews from SCSI people.

Thanks.

--
tejun

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