biovec_slab
kmem_cache_free(biovec_slab(nr_vecs)->slab, bv);
struct biovec_slab *bvs = biovec_slab(*nr_vecs);
struct biovec_slab *bp = bvec_slabs + ARRAY_SIZE(bvec_slabs) - 1;
struct biovec_slab *bvs = bvec_slabs + i;
static struct biovec_slab *biovec_slab(unsigned short nr_vecs)