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