vtblk_gtoh64
req->vbr_hdr->sector = vtblk_gtoh64(sc, bp->bio_offset /
req->vbr_hdr->sector = vtblk_gtoh64(sc, bp->bio_offset /
req->vbr_hdr->sector = vtblk_gtoh64(sc, bp->bio_offset /
discard->sector = vtblk_gtoh64(sc, bp->bio_offset / VTBLK_BSIZE);
req->vbr_hdr->sector = vtblk_gtoh64(sc, offset / VTBLK_BSIZE);