lblktooff
if ((error = bread(vp, lblktooff(imp, lbn), bsize, &bp)) != 0) {
error = VOP_BMAP(vp, lblktooff(imp, lbn), &doffset, NULL, NULL,
lblktooff(ana->imp, ana->iso_ce_blk),
lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)),
lblktooff(imp, lbn),
loffset = lblktooff(imp, lbn);
raoffset = lblktooff(imp, rablock);